//
// macOS-Cocoa specific code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2026 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
//     https://www.fltk.org/bugs.php
//

extern "C" {
#include <pthread.h>
}

#include <config.h>
#include <FL/Fl.H>
#include <FL/platform.H>
#include "Fl_Window_Driver.H"
#include "Fl_Screen_Driver.H"
#include "Fl_Timeout.h"
#include <FL/Fl_Window.H>
#include <FL/Fl_Tooltip.H>
#include <FL/Fl_Image_Surface.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Rect.H>
#include <FL/fl_string_functions.h>
#include "drivers/Quartz/Fl_Quartz_Graphics_Driver.H"
#include "drivers/Quartz/Fl_Quartz_Copy_Surface_Driver.H"
#include "drivers/Cocoa/Fl_Cocoa_Screen_Driver.H"
#include "drivers/Cocoa/Fl_Cocoa_Window_Driver.H"
#include "drivers/Darwin/Fl_Darwin_System_Driver.H"
#include "drivers/Cocoa/Fl_MacOS_Sys_Menu_Bar_Driver.H"
#include "print_button.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <math.h>
#include <limits.h>
#include <dlfcn.h>
#include <string.h>
#include <pwd.h>

#import <Cocoa/Cocoa.h>
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_15_0
# import <ScreenCaptureKit/ScreenCaptureKit.h>
#endif

// #define DEBUG_SELECT         // UNCOMMENT FOR SELECT()/THREAD DEBUGGING
#ifdef DEBUG_SELECT
#include <stdio.h>              // testing
#define DEBUGMSG(msg)           if ( msg ) fprintf(stderr, msg);
#define DEBUGPERRORMSG(msg)     if ( msg ) perror(msg)
#define DEBUGTEXT(txt)          txt
#else
#define DEBUGMSG(msg)
#define DEBUGPERRORMSG(msg)
#define DEBUGTEXT(txt)          NULL
#endif /*DEBUG_SELECT*/

// external functions
extern void fl_fix_focus();
extern int fl_send_system_handlers(void *e);

// forward definition of functions in this file
// converting cr lf converter function
static void createAppleMenu(void);
static void cocoaMouseHandler(NSEvent *theEvent);
static void clipboard_check(void);
static NSBitmapImageRep* rect_to_NSBitmapImageRep(Fl_Window *win, int x, int y, int w, int h);
static NSBitmapImageRep* rect_to_NSBitmapImageRep_subwins(Fl_Window *win, int x, int y, int w, int h, bool capture_subwins);
static void drain_dropped_files_list(void);
static NSPoint FLTKtoCocoa(Fl_Window *win, int x, int y, int H);
static int get_window_frame_sizes(Fl_Window *win, int *pbx = NULL, int *pby = NULL);

int fl_mac_os_version = Fl_Darwin_System_Driver::calc_mac_os_version();         // the version number of the running Mac OS X (e.g., 100604 for 10.6.4)

// public variables
void *fl_capture = 0;                   // (NSWindow*) we need this to compensate for a missing(?) mouse capture
FLWindow *fl_window;

// forward declarations of variables in this file
static int main_screen_height; // height of menubar-containing screen used to convert between Cocoa and FLTK global screen coordinates
// through_drawRect = YES means the drawRect: message was sent to the view,
// thus the graphics context was prepared by the system
static BOOL through_drawRect = NO;
// through_Fl_X_flush = YES means Fl_Cocoa_Window_Driver::flush() was called
static BOOL through_Fl_X_flush = NO;
static BOOL views_use_CA = NO; // YES means views are layer-backed, as on macOS 10.14 when linked with SDK 10.14
static int im_enabled = -1;
// OS version-dependent pasteboard type names.
// Some, but not all, versions of the 10.6 SDK for PPC lack the 3 symbols below (PR #761)
#if (MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6) || defined(__POWERPC__)
#  define NSPasteboardTypeTIFF @"public.tiff"
#  define NSPasteboardTypePDF @"com.adobe.pdf"
#  define NSPasteboardTypeString @"public.utf8-plain-text"
#endif

// the next 5 deprecation/availability warnings can be legitimately ignored
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#pragma clang diagnostic ignored "-Wunguarded-availability"
static NSString *TIFF_pasteboard_type = (fl_mac_os_version >= 100600 ? NSPasteboardTypeTIFF :
                                         NSTIFFPboardType);
static NSString *PDF_pasteboard_type = (fl_mac_os_version >= 100600 ? NSPasteboardTypePDF :
                                        NSPDFPboardType);
static NSString *PICT_pasteboard_type = (fl_mac_os_version >= 100600 ? @"com.apple.pict" :
                                         NSPICTPboardType);
static NSString *UTF8_pasteboard_type = (fl_mac_os_version >= 100600 ? NSPasteboardTypeString :
                                         NSStringPboardType);
static NSString *fl_filenames_pboard_type =
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_13
  (fl_mac_os_version >= 101300 ? NSPasteboardTypeFileURL : NSFilenamesPboardType);
#else
  NSFilenamesPboardType;
#endif
#pragma clang diagnostic pop

static bool in_nsapp_run = false; // true during execution of [NSApp run]
static NSMutableArray *dropped_files_list = nil; // list of files dropped at app launch
typedef void (*open_cb_f_type)(const char *);
static Fl_Window *starting_moved_window = NULL; // the moved window which brings its subwins with it

enum { FLTKTimerEvent = 1, FLTKDataReadyEvent };

// Carbon functions and definitions

typedef void *TSMDocumentID;

extern "C" enum {
 kTSMDocumentEnabledInputSourcesPropertyTag = 'enis' //  from Carbon/TextServices.h
};

// Undocumented voodoo. Taken from Mozilla.
static const int smEnableRomanKybdsOnly = -23;

typedef TSMDocumentID (*TSMGetActiveDocument_type)(void);
static TSMGetActiveDocument_type TSMGetActiveDocument;
typedef OSStatus (*TSMSetDocumentProperty_type)(TSMDocumentID, OSType, UInt32, void*);
static TSMSetDocumentProperty_type TSMSetDocumentProperty;
typedef OSStatus (*TSMRemoveDocumentProperty_type)(TSMDocumentID, OSType);
static TSMRemoveDocumentProperty_type TSMRemoveDocumentProperty;
typedef CFArrayRef (*TISCreateInputSourceList_type)(CFDictionaryRef, Boolean);
static TISCreateInputSourceList_type TISCreateInputSourceList;
static CFStringRef kTISTypeKeyboardLayout;
static CFStringRef kTISPropertyInputSourceType;

typedef void (*KeyScript_type)(short);
static KeyScript_type KeyScript;

#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_13
const NSInteger NSControlStateValueOn = NSOnState;
const NSInteger NSControlStateValueOff = NSOffState;
#endif

#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_12
const NSUInteger NSEventModifierFlagCommand = NSCommandKeyMask;
const NSUInteger NSEventModifierFlagOption = NSAlternateKeyMask;
const NSUInteger NSEventModifierFlagControl = NSControlKeyMask;
const NSUInteger NSEventModifierFlagShift = NSShiftKeyMask;
const NSUInteger NSEventModifierFlagCapsLock = NSAlphaShiftKeyMask;

const NSEventType NSEventTypeLeftMouseDown = NSLeftMouseDown;
const NSEventType NSEventTypeRightMouseDown = NSRightMouseDown;
const NSEventType NSEventTypeOtherMouseDown = NSOtherMouseDown;
const NSEventType NSEventTypeLeftMouseUp = NSLeftMouseUp;
const NSEventType NSEventTypeRightMouseUp = NSRightMouseUp;
const NSEventType NSEventTypeOtherMouseUp = NSOtherMouseUp;
const NSEventType NSEventTypeLeftMouseDragged = NSLeftMouseDragged;
const NSEventType NSEventTypeRightMouseDragged = NSRightMouseDragged;
const NSEventType NSEventTypeOtherMouseDragged = NSOtherMouseDragged;
const NSEventType NSEventTypeMouseMoved = NSMouseMoved;
const NSEventType NSEventTypeMouseEntered = NSMouseEntered;
const NSEventType NSEventTypeMouseExited = NSMouseExited;
const NSEventType NSEventTypeKeyUp = NSKeyUp;
const NSEventType NSEventTypeApplicationDefined = NSApplicationDefined;

const NSUInteger NSWindowStyleMaskResizable = NSResizableWindowMask;
const NSUInteger NSWindowStyleMaskBorderless = NSBorderlessWindowMask;
const NSUInteger NSWindowStyleMaskMiniaturizable = NSMiniaturizableWindowMask;
const NSUInteger NSWindowStyleMaskClosable = NSClosableWindowMask;
const NSUInteger NSWindowStyleMaskTitled = NSTitledWindowMask;
#  if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
const NSUInteger NSWindowStyleMaskFullScreen = NSFullScreenWindowMask;
#  endif

const NSUInteger NSEventMaskAny = NSAnyEventMask;
const NSUInteger NSEventMaskSystemDefined = NSSystemDefinedMask;

#  if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
const NSUInteger NSBitmapFormatAlphaFirst = NSAlphaFirstBitmapFormat;
const NSUInteger NSBitmapFormatAlphaNonpremultiplied = NSAlphaNonpremultipliedBitmapFormat;
#  endif
#endif

/*
 * Mac keyboard lookup table
 */
static unsigned short* macKeyLookUp = NULL;

/*
 * convert the current mouse chord into the FLTK modifier state
 */
static unsigned int mods_to_e_state( NSUInteger mods )
{
  unsigned int state = 0;
  if ( mods & NSEventModifierFlagCommand ) state |= FL_META;
  if ( mods & NSEventModifierFlagOption ) state |= FL_ALT;
  if ( mods & NSEventModifierFlagControl ) state |= FL_CTRL;
  if ( mods & NSEventModifierFlagShift ) state |= FL_SHIFT;
  if ( mods & NSEventModifierFlagCapsLock ) state |= FL_CAPS_LOCK;
  unsigned int ret = ( Fl::e_state & 0xff000000 ) | state;
  Fl::e_state = ret;
  //printf( "State 0x%08x (%04x)\n", Fl::e_state, mods );
  return ret;
}

// these pointers are set by the Fl::lock() function:
static void nothing() {}
void (*fl_lock_function)() = nothing;
void (*fl_unlock_function)() = nothing;

//
// Select interface -- how it's implemented:
//     When the user app configures one or more file descriptors to monitor
//     with Fl::add_fd(), we start a separate thread to select() the  data,
//     sending a custom OSX 'FLTK data ready event' to the parent  thread's
//     RunApplicationLoop(), so that it triggers the data  ready  callbacks
//     in the parent thread.                               -erco 04/04/04
//
#define POLLIN  1
#define POLLOUT 4
#define POLLERR 8

// Class to handle select() 'data ready'
class DataReady
{
  struct FD
  {
    int fd;
    short events;
    void (*cb)(int, void*);
    void* arg;
  };
  int nfds, fd_array_size;
  FD *fds;
  pthread_t tid;                // select()'s thread id

  // Data that needs to be locked (all start with '_')
  pthread_mutex_t _datalock;    // data lock
  fd_set _fdsets[3];            // r/w/x sets user wants to monitor
  int _maxfd;                   // max fd count to monitor
  int _cancelpipe[2];           // pipe used to help cancel thread

public:
  DataReady()
  {
    nfds = 0;
    fd_array_size = 0;
    fds = 0;
    tid = 0;

    pthread_mutex_init(&_datalock, NULL);
    FD_ZERO(&_fdsets[0]); FD_ZERO(&_fdsets[1]); FD_ZERO(&_fdsets[2]);
    _cancelpipe[0] = _cancelpipe[1] = 0;
    _maxfd = -1;
  }

  ~DataReady()
  {
    CancelThread(DEBUGTEXT("DESTRUCTOR\n"));
    if (fds) { free(fds); fds = 0; }
    nfds = 0;
  }

  // Locks
  //    The convention for locks: volatile vars start with '_',
  //    and must be locked before use. Locked code is prefixed
  //    with /*LOCK*/ to make painfully obvious esp. in debuggers. -erco
  //
  void DataLock() { pthread_mutex_lock(&_datalock); }
  void DataUnlock() { pthread_mutex_unlock(&_datalock); }

  // Accessors
  int IsThreadRunning() { return(tid ? 1 : 0); }
  int GetNfds() { return(nfds); }
  int GetCancelPipe(int ix) { return(_cancelpipe[ix]); }
  fd_set GetFdset(int ix) { return(_fdsets[ix]); }

  // Methods
  void AddFD(int n, int events, void (*cb)(int, void*), void *v);
  void RemoveFD(int n, int events);
  int CheckData(fd_set& r, fd_set& w, fd_set& x);
  void HandleData(fd_set& r, fd_set& w, fd_set& x);
  static void* DataReadyThread(void *self);
  void StartThread(void);
  void CancelThread(const char *reason);
};

static DataReady dataready;

void DataReady::AddFD(int n, int events, void (*cb)(int, void*), void *v)
{
  RemoveFD(n, events);
  int i = nfds++;
  if (i >= fd_array_size)
  {
    fl_open_display(); // necessary for NSApp to be defined and the event loop to work
    FD *temp;
    fd_array_size = 2*fd_array_size+1;
    if (!fds) { temp = (FD*)malloc(fd_array_size*sizeof(FD)); }
    else { temp = (FD*)realloc(fds, fd_array_size*sizeof(FD)); }
    if (!temp) return;
    fds = temp;
  }
  fds[i].cb  = cb;
  fds[i].arg = v;
  fds[i].fd  = n;
  fds[i].events = events;
  DataLock();
  /*LOCK*/  if (events & POLLIN)  FD_SET(n, &_fdsets[0]);
  /*LOCK*/  if (events & POLLOUT) FD_SET(n, &_fdsets[1]);
  /*LOCK*/  if (events & POLLERR) FD_SET(n, &_fdsets[2]);
  /*LOCK*/  if (n > _maxfd) _maxfd = n;
  DataUnlock();
}

// Remove an FD from the array
void DataReady::RemoveFD(int n, int events)
{
  int i,j;
  _maxfd = -1; // recalculate maxfd on the fly
  for (i=j=0; i<nfds; i++) {
    if (fds[i].fd == n) {
      int e = fds[i].events & ~events;
      if (!e) continue; // if no events left, delete this fd
      fds[i].events = e;
    }
    if (fds[i].fd > _maxfd) _maxfd = fds[i].fd;
    // move it down in the array if necessary:
    if (j<i) {
      fds[j] = fds[i];
    }
    j++;
  }
  nfds = j;
  DataLock();
  /*LOCK*/  if (events & POLLIN)  FD_CLR(n, &_fdsets[0]);
  /*LOCK*/  if (events & POLLOUT) FD_CLR(n, &_fdsets[1]);
  /*LOCK*/  if (events & POLLERR) FD_CLR(n, &_fdsets[2]);
  DataUnlock();
}

// CHECK IF USER DATA READY, RETURNS r/w/x INDICATING WHICH IF ANY
int DataReady::CheckData(fd_set& r, fd_set& w, fd_set& x)
{
  int ret;
  DataLock();
  /*LOCK*/  timeval t = { 0, 1 };               // quick check
  /*LOCK*/  r = _fdsets[0], w = _fdsets[1], x = _fdsets[2];
  /*LOCK*/  ret = ::select(_maxfd+1, &r, &w, &x, &t);
  DataUnlock();
  if ( ret == -1 ) {
    DEBUGPERRORMSG("CheckData(): select()");
  }
  return(ret);
}

// HANDLE DATA READY CALLBACKS
void DataReady::HandleData(fd_set& r, fd_set& w, fd_set& x)
{
  for (int i=0; i<nfds; i++) {
    int f = fds[i].fd;
    short revents = 0;
    if (FD_ISSET(f, &r)) revents |= POLLIN;
    if (FD_ISSET(f, &w)) revents |= POLLOUT;
    if (FD_ISSET(f, &x)) revents |= POLLERR;
    if (fds[i].events & revents) {
      DEBUGMSG("DOING CALLBACK: ");
      fds[i].cb(f, fds[i].arg);
      DEBUGMSG("DONE\n");
    }
  }
}

// DATA READY THREAD
//    This thread watches for changes in user's file descriptors.
//    Sends a 'data ready event' to the main thread if any change.
//
void* DataReady::DataReadyThread(void *o)
{
  DataReady *self = (DataReady*)o;
  while ( 1 ) {                                 // loop until thread cancel or error
    // Thread safe local copies of data before each select()
    self->DataLock();
    /*LOCK*/  int maxfd = self->_maxfd;
    /*LOCK*/  fd_set r = self->GetFdset(0);
    /*LOCK*/  fd_set w = self->GetFdset(1);
    /*LOCK*/  fd_set x = self->GetFdset(2);
    /*LOCK*/  int cancelpipe = self->GetCancelPipe(0);
    /*LOCK*/  if ( cancelpipe > maxfd ) maxfd = cancelpipe;
    /*LOCK*/  FD_SET(cancelpipe, &r);           // add cancelpipe to fd's to watch
    /*LOCK*/  FD_SET(cancelpipe, &x);
    self->DataUnlock();
    // timeval t = { 1000, 0 }; // 1000 seconds;
    timeval t = { 2, 0 };       // HACK: 2 secs prevents 'hanging' problem
    int ret = ::select(maxfd+1, &r, &w, &x, &t);
    pthread_testcancel();       // OSX 10.0.4 and older: needed for parent to cancel
    switch ( ret ) {
      case 0:   // NO DATA
        continue;
      case -1:  // ERROR
      {
        DEBUGPERRORMSG("CHILD THREAD: select() failed");
        return(NULL);           // error? exit thread
      }
      default:  // DATA READY
      {
        if (FD_ISSET(cancelpipe, &r) || FD_ISSET(cancelpipe, &x))       // cancel?
          { return(NULL); }                                             // just exit
        DEBUGMSG("CHILD THREAD: DATA IS READY\n");
        NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
        NSEvent *event = [NSEvent otherEventWithType:NSEventTypeApplicationDefined
                                            location:NSMakePoint(0,0)
                                       modifierFlags:0
                                           timestamp:0
                                        windowNumber:0 context:NULL subtype:FLTKDataReadyEvent data1:0 data2:0];
        [NSApp postEvent:event atStart:NO];
        [localPool release];
        return(NULL);           // done with thread
      }
    }
  }
}

// START 'DATA READY' THREAD RUNNING, CREATE INTER-THREAD PIPE
void DataReady::StartThread(void)
{
  CancelThread(DEBUGTEXT("STARTING NEW THREAD\n"));
  DataLock();
  /*LOCK*/  pipe(_cancelpipe);  // pipe for sending cancel msg to thread
  DataUnlock();
  DEBUGMSG("*** START THREAD\n");
  pthread_create(&tid, NULL, DataReadyThread, (void*)this);
}

// CANCEL 'DATA READY' THREAD, CLOSE PIPE
void DataReady::CancelThread(const char *reason)
{
  if ( tid ) {
    DEBUGMSG("*** CANCEL THREAD: ");
    DEBUGMSG(reason);
    if ( pthread_cancel(tid) == 0 ) {           // cancel first
      DataLock();
      /*LOCK*/  write(_cancelpipe[1], "x", 1);  // wake thread from select
      DataUnlock();
      pthread_join(tid, NULL);                  // wait for thread to finish
    }
    tid = 0;
    DEBUGMSG("(JOINED) OK\n");
  }
  // Close pipe if open
  DataLock();
  /*LOCK*/  if ( _cancelpipe[0] ) { close(_cancelpipe[0]); _cancelpipe[0] = 0; }
  /*LOCK*/  if ( _cancelpipe[1] ) { close(_cancelpipe[1]); _cancelpipe[1] = 0; }
  DataUnlock();
}

void Fl_Darwin_System_Driver::add_fd( int n, int events, void (*cb)(int, void*), void *v )
{
  dataready.AddFD(n, events, cb, v);
}

void Fl_Darwin_System_Driver::add_fd(int fd, void (*cb)(int, void*), void* v)
{
  dataready.AddFD(fd, POLLIN, cb, v);
}

void Fl_Darwin_System_Driver::remove_fd(int n, int events)
{
  dataready.RemoveFD(n, events);
}

void Fl_Darwin_System_Driver::remove_fd(int n)
{
  dataready.RemoveFD(n, -1);
}

/*
 * Check if there is actually a message pending
 */
int Fl_Darwin_System_Driver::ready()

{
  NSEvent *retval = [NSApp nextEventMatchingMask:NSEventMaskAny
                                       untilDate:[NSDate dateWithTimeIntervalSinceNow:0]
                                          inMode:NSDefaultRunLoopMode
                                         dequeue:NO];
  return retval != nil;
}


static void processFLTKEvent(void) {
  fl_lock_function();
  dataready.CancelThread(DEBUGTEXT("DATA READY EVENT\n"));

  // CHILD THREAD TELLS US DATA READY
  //     Check to see what's ready, and invoke user's cb's
  //
  fd_set r,w,x;
  switch(dataready.CheckData(r,w,x)) {
    case 0:     // NO DATA
      break;
    case -1:    // ERROR
      break;
    default:    // DATA READY
      dataready.HandleData(r,w,x);
      break;
  }
  fl_unlock_function();
  return;
}


/*
 * break the current event loop
 */
void Fl_Cocoa_Screen_Driver::breakMacEventLoop()
{
  NSEvent *event = [NSEvent otherEventWithType:NSEventTypeApplicationDefined
                                      location:NSMakePoint(0,0)
                                 modifierFlags:0 timestamp:0
                                  windowNumber:0 context:NULL
                                       subtype:FLTKTimerEvent
                                         data1:0
                                         data2:0];
  [NSApp postEvent:event atStart:NO];
}


@interface FLWindow : NSWindow {
  Fl_Window *w;
}
- (FLWindow*)initWithFl_W:(Fl_Window *)flw
              contentRect:(NSRect)rect
                styleMask:(NSUInteger)windowStyle;
- (Fl_Window *)getFl_Window;
- (void)recursivelySendToSubwindows:(SEL)sel applyToSelf:(BOOL)b;
- (void)setSubwindowFrame;
- (void)checkSubwindowFrame;
- (void)waitForExpose;
- (NSRect)constrainFrameRect:(NSRect)frameRect toScreen:(NSScreen *)screen;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
- (NSPoint)convertBaseToScreen:(NSPoint)aPoint;
#endif
- (NSBitmapImageRep*)rect_to_NSBitmapImageRep:(Fl_Rect*)r;
- (void)makeKeyWindow;
@end


@interface FLView : NSView <NSTextInput
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
, NSTextInputClient
#endif
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
,NSDraggingSource
#endif
> {
  BOOL in_key_event; // YES means keypress is being processed by handleEvent
  BOOL need_handle; // YES means Fl::handle(FL_KEYBOARD,) is needed after handleEvent processing
  NSInteger identifier;
  NSRange selectedRange;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
@public
  CGContextRef aux_bitmap; // all drawing to view goes there and is finally copied to the CALayer
#endif
}
+ (void)prepareEtext:(NSString*)aString;
+ (void)concatEtext:(NSString*)aString;
- (BOOL)process_keydown:(NSEvent*)theEvent;
- (id)initWithFrame:(NSRect)frameRect;
- (void)drawRect:(NSRect)rect;
- (BOOL)acceptsFirstResponder;
- (BOOL)acceptsFirstMouse:(NSEvent*)theEvent;
- (void)resetCursorRects;
- (BOOL)performKeyEquivalent:(NSEvent*)theEvent;
- (void)mouseUp:(NSEvent *)theEvent;
- (void)rightMouseUp:(NSEvent *)theEvent;
- (void)otherMouseUp:(NSEvent *)theEvent;
- (void)mouseDown:(NSEvent *)theEvent;
- (void)rightMouseDown:(NSEvent *)theEvent;
- (void)otherMouseDown:(NSEvent *)theEvent;
- (void)mouseMoved:(NSEvent *)theEvent;
- (void)mouseEntered:(NSEvent *)theEvent;
- (void)mouseExited:(NSEvent *)theEvent;
- (void)mouseDragged:(NSEvent *)theEvent;
- (void)rightMouseDragged:(NSEvent *)theEvent;
- (void)otherMouseDragged:(NSEvent *)theEvent;
- (void)scrollWheel:(NSEvent *)theEvent;
- (void)magnifyWithEvent:(NSEvent *)theEvent;
- (void)keyDown:(NSEvent *)theEvent;
- (void)keyUp:(NSEvent *)theEvent;
- (void)flagsChanged:(NSEvent *)theEvent;
- (NSDragOperation)draggingEntered:(id < NSDraggingInfo >)sender;
- (NSDragOperation)draggingUpdated:(id < NSDraggingInfo >)sender;
- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender;
- (void)draggingExited:(id < NSDraggingInfo >)sender;
- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal;
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_5
- (void)insertText:(id)aString replacementRange:(NSRange)replacementRange;
- (void)setMarkedText:(id)aString selectedRange:(NSRange)newSelection replacementRange:(NSRange)replacementRange;
- (NSAttributedString *)attributedSubstringForProposedRange:(NSRange)aRange actualRange:(NSRangePointer)actualRange;
- (NSRect)firstRectForCharacterRange:(NSRange)aRange actualRange:(NSRangePointer)actualRange;
- (NSInteger)windowLevel;
#else
- (void)updateTrackingAreas;
#endif
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
- (NSDragOperation)draggingSession:(NSDraggingSession *)session sourceOperationMaskForDraggingContext:(NSDraggingContext)context;
- (void)draggingSession:(NSDraggingSession *)session
           endedAtPoint:(NSPoint)screenPoint operation:(NSDragOperation)operation;
#endif
- (BOOL)did_view_resolution_change;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
- (void)create_aux_bitmap:(CGContextRef)gc retina:(BOOL)r;
- (void)reset_aux_bitmap;
#endif
@end


@implementation FLWindow
- (void)close
{
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
  if (views_use_CA) [(FLView*)[self contentView] reset_aux_bitmap];
#endif
  [[self standardWindowButton:NSWindowDocumentIconButton] setImage:nil];
  [super close];
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
  while (fl_mac_os_version >= 100500) {
    NSArray *a = [[self contentView] trackingAreas];
    if ([a count] == 0) break;
    NSTrackingArea *ta = (NSTrackingArea*)[a objectAtIndex:0];
    [[self contentView] removeTrackingArea:ta];
  }
#endif
  // when a fullscreen window is closed, windowDidResize may be sent after the close message was sent
  // and before the FLWindow receives the final dealloc message
  w = NULL;
}
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
- (NSPoint)convertBaseToScreen:(NSPoint)aPoint
{
  if (fl_mac_os_version >= 100700) {
    NSRect r = [self convertRectToScreen:NSMakeRect(aPoint.x, aPoint.y, 0, 0)];
    return r.origin;
    }
  else {
    // replaces return [super convertBaseToScreen:aPoint] that may trigger a compiler warning
    typedef NSPoint (*convertIMP)(id, SEL, NSPoint);
    static convertIMP addr = (convertIMP)[NSWindow instanceMethodForSelector:@selector(convertBaseToScreen:)];
    return addr(self, @selector(convertBaseToScreen:), aPoint);
    }
}
#endif

- (FLWindow*)initWithFl_W:(Fl_Window *)flw
              contentRect:(NSRect)rect
                styleMask:(NSUInteger)windowStyle
{
  self = [super initWithContentRect:rect styleMask:windowStyle backing:NSBackingStoreBuffered defer:NO];
  if (self) {
    w = flw;
    if (fl_mac_os_version >= 100700) {
      // replaces [self setRestorable:NO] that may trigger a compiler warning
      typedef void (*setIMP)(id, SEL, BOOL);
      static setIMP addr = (setIMP)[NSWindow instanceMethodForSelector:@selector(setRestorable:)];
      addr(self, @selector(setRestorable:), NO);
      }
  }
  return self;
}
- (Fl_Window *)getFl_Window;
{
  return w;
}

- (BOOL)canBecomeKeyWindow
{
  if (Fl::modal_ && (Fl::modal_ != w))
    return NO;  // prevent the caption to be redrawn as active on click
                //  when another modal window is currently the key win
  return !(!w || w->output() || w->tooltip_window() || w->menu_window() || w->parent());
}

- (BOOL)canBecomeMainWindow
{
  if (Fl::modal_ && (Fl::modal_ != w))
    return NO;  // prevent the caption to be redrawn as active on click
                //  when another modal window is currently the key win

  return !(!w || w->tooltip_window() || w->menu_window() || w->parent());
}

- (void)recursivelySendToSubwindows:(SEL)sel applyToSelf:(BOOL)b
{
  if (b) [self performSelector:sel];
  NSEnumerator *enumerator = [[self childWindows] objectEnumerator];
  id child;
  while ((child = [enumerator nextObject]) != nil) {
    if ([child isKindOfClass:[FLWindow class]]) [child recursivelySendToSubwindows:sel applyToSelf:YES];
  }
}

- (void)setSubwindowFrame { // have the cocoa position and size of a (sub)window follow its FLTK data
  Fl_Window *parent = w->window();
  if (!w->visible_r()) return;
  NSPoint pt = FLTKtoCocoa(w, w->x(), w->y(), w->h());
  float s = Fl::screen_driver()->scale(0);
  int bt = parent ? 0 : get_window_frame_sizes(w);
  NSRect rp = NSMakeRect(round(pt.x), round(pt.y), round(s * w->w()), round(s * w->h()) + bt);
  if (!NSEqualRects(rp, [self frame])) {
    [self setFrame:rp display:(views_use_CA ? NO : YES)];
  }
  if (parent && ![self parentWindow]) { // useful when subwin is first shown, not when moved
    FLWindow *pxid = fl_xid(parent);
    [pxid addChildWindow:self ordered:NSWindowAbove]; // needs OS X 10.2
    [self orderWindow:NSWindowAbove relativeTo:[pxid windowNumber]]; // necessary under 10.3
  }
}

- (void)checkSubwindowFrame {
  if (!w->parent()) return;
  // make sure this subwindow doesn't leak out of its parent window
  Fl_Window *from = w, *parent;
  CGRect full = CGRectMake(0, 0, w->w(), w->h()); // full subwindow area
  CGRect srect = full; // will become new subwindow clip
  int fromx = 0, fromy = 0;
  while ((parent = from->window()) != NULL) { // loop over all parent windows
    fromx -= from->x(); // parent origin in subwindow's coordinates
    fromy -= from->y();
    CGRect prect = CGRectMake(fromx, fromy, parent->w(), parent->h());
    srect = CGRectIntersection(prect, srect); // area of subwindow inside its parent
    from = parent;
  }
  Fl_Cocoa_Window_Driver *d = Fl_Cocoa_Window_Driver::driver(w);
  CGRect *r = d->subRect();
  CGRect current_clip = (r ? *r : full); // current subwindow clip
  if (!CGRectEqualToRect(srect, current_clip)) { // if new clip differs from current clip
    delete r;
    FLWindow *xid = fl_xid(w);
    FLView *view = (FLView*)[xid contentView];
    if (CGRectEqualToRect(srect, full)) {
      r = NULL;
    } else {
      r = new CGRect(srect);
      if (r->size.width == 0 && r->size.height == 0) r->origin.x = r->origin.y = 0;
    }
    d->subRect(r);
    w->redraw();
    if (fl_mac_os_version < 100900) {
      NSInteger parent_num = [fl_xid(w->window()) windowNumber];
      [xid orderWindow:NSWindowBelow relativeTo:parent_num];
      [xid orderWindow:NSWindowAbove relativeTo:parent_num];
    }
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
    if (!views_use_CA || view->aux_bitmap)
#endif
      [view display]; // subwindow needs redrawn
  }
}

-(void)waitForExpose
{
  if ([self getFl_Window]->shown()) {
    // this makes freshly created windows appear on the screen, if they are not there already
    NSModalSession session = [NSApp beginModalSessionForWindow:self];
    [NSApp runModalSession:session];
    [NSApp endModalSession:session];
  }
}

/* With Mac OS 10.11 the green window button makes window fullscreen (covers system menu bar and dock).
 When there are subwindows, they are by default constrained not to cover the menu bar
 (this is arguably a Mac OS bug).
 Overriding the constrainFrameRect:toScreen: method removes this constraint.
 */
- (NSRect)constrainFrameRect:(NSRect)frameRect toScreen:(NSScreen *)screen
{
  if ([self parentWindow]) return frameRect; // do not constrain subwindows
  return [super constrainFrameRect:frameRect toScreen:screen]; // will prevent a window from going above the menu bar
}
- (NSBitmapImageRep*)rect_to_NSBitmapImageRep:(Fl_Rect*)r {
  return rect_to_NSBitmapImageRep(w, r->x(), r->y(), r->w(), r->h());
}
- (void)makeKeyWindow {
  // Necessary in this scenario at least:
  // transition of a subwindow-containing window from multiscreen-fullscreen mode to normal mode.
  if ([self canBecomeKeyWindow]) [super makeKeyWindow];
}
@end

@interface FLApplication : NSObject
{
}
+ (void)sendEvent:(NSEvent *)theEvent;
@end

/*
 * This function is the central event handler.
 * It reads events from the event queue using the given maximum time
 */
static int do_queued_events( double time = 0.0 )
{
  static int got_events; // not sure the static is necessary here
  got_events = 0;

  // Check for re-entrant condition
  if ( dataready.IsThreadRunning() ) {
    dataready.CancelThread(DEBUGTEXT("AVOID REENTRY\n"));
  }

  // Start thread to watch for data ready
  if ( dataready.GetNfds() ) {
    dataready.StartThread();
  }

  // Elapse timeouts and calculate waiting time
  Fl_Timeout::elapse_timeouts();
  time = Fl_Timeout::time_to_wait(time);

  fl_unlock_function();
  NSEvent *event;
  while ( (event = [NSApp nextEventMatchingMask:NSEventMaskAny
                                      untilDate:[NSDate dateWithTimeIntervalSinceNow:time]
                                         inMode:NSDefaultRunLoopMode
                                        dequeue:YES]) != nil ) {
    got_events = 1;
    [FLApplication sendEvent:event]; // will then call [NSApplication sendevent:]
    time = 0;
  }
  fl_lock_function();

  return got_events;
}

double Fl_Darwin_System_Driver::wait(double time_to_wait)
{
  if (dropped_files_list) { // when the list of dropped files is not empty, open one and remove it from list
    drain_dropped_files_list();
  }
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

  time_to_wait = Fl_System_Driver::wait(time_to_wait);
  // the deprecation warnings can be ignored because they run only for macOS < 10.11
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
  if (fl_mac_os_version < 101100) NSDisableScreenUpdates(); // deprecated 10.11
  Fl::flush();
  if (fl_mac_os_version < 101100) NSEnableScreenUpdates(); // deprecated 10.11
#pragma clang diagnostic pop
  if (Fl::idle) // 'idle' may have been set within flush()
    time_to_wait = 0.0;
  int retval = do_queued_events(time_to_wait);

  Fl_Cocoa_Window_Driver::q_release_context();
  [pool release];
  return retval;
}

static NSInteger max_normal_window_level(void)
{
  Fl_X *x;
  NSInteger max_level;

  max_level = 0;

  for (x = Fl_X::first;x;x = x->next) {
    NSInteger level;
    FLWindow *cw = (FLWindow*)x->xid;
    Fl_Window *win = x->w;
    if (!win || !cw || ![cw isVisible])
      continue;
    if (win->modal() || win->non_modal())
      continue;
    level = [cw level];
    if (level >= max_level)
      max_level = level;
  }

  return max_level;
}

// appropriate window level for modal windows
static NSInteger modal_window_level(void)
{
  NSInteger level;

  level = max_normal_window_level();
  if (level < NSStatusWindowLevel)
    return NSStatusWindowLevel;

  // Need some room for non-modal windows
  level += 2;

  // We cannot exceed this
  if (level > CGShieldingWindowLevel())
    return CGShieldingWindowLevel();

  return level;
}

// appropriate window level for non-modal windows
static NSInteger non_modal_window_level(void)
{
  NSInteger level;

  level = max_normal_window_level();
  if (level < NSFloatingWindowLevel)
    return NSFloatingWindowLevel;

  level += 1;

  if (level > CGShieldingWindowLevel())
    return CGShieldingWindowLevel();

  return level;
}

// makes sure modal and non-modal windows stay on top
static void fixup_window_levels(void)
{
  NSInteger modal_level, non_modal_level;

  Fl_X *x;
  FLWindow *prev_modal, *prev_non_modal;

  modal_level = modal_window_level();
  non_modal_level = non_modal_window_level();

  prev_modal = NULL;
  prev_non_modal = NULL;

  for (x = Fl_X::first;x;x = x->next) {
    FLWindow *cw = (FLWindow*)x->xid;
    Fl_Window *win = x->w;
    if (!win || !cw || ![cw isVisible])
      continue;
    if (win->modal()) {
      if ([cw level] != modal_level) {
        [cw setLevel:modal_level];
        // changing level puts then in front, so make sure the
        // stacking isn't messed up
        if (prev_modal != NULL)
          [cw orderWindow:NSWindowBelow
              relativeTo:[prev_modal windowNumber]];
      }
      prev_modal = cw;
    } else if (win->non_modal()) {
      if ([cw level] != non_modal_level) {
        [cw setLevel:non_modal_level];
        if (prev_non_modal != NULL)
          [cw orderWindow:NSWindowBelow
              relativeTo:[prev_non_modal windowNumber]];
      }
      prev_non_modal = cw;
    }
  }
}


// updates Fl::e_x, Fl::e_y, Fl::e_x_root, and Fl::e_y_root
static void update_e_xy_and_e_xy_root(NSWindow *nsw)
{
  NSPoint pt;
  pt = [nsw mouseLocationOutsideOfEventStream];
  float s = Fl::screen_driver()->scale(0);
  Fl::e_x = int(pt.x / s);
  Fl::e_y = int(([[nsw contentView] frame].size.height - pt.y)/s);
  pt = [NSEvent mouseLocation];
  Fl::e_x_root = int(pt.x/s);
  Fl::e_y_root = int((main_screen_height - pt.y)/s);
}


/*
 * Cocoa Mousewheel handler
 */
static void cocoaMouseWheelHandler(NSEvent *theEvent)
{
  // Handle the new "MightyMouse" mouse wheel events. Please, someone explain
  // to me why Apple changed the API on this even though the current API
  // supports two wheels just fine. Matthias,
  fl_lock_function();
  Fl_Window *window = (Fl_Window*)[(FLWindow*)[theEvent window] getFl_Window];
  Fl::first_window(window);
  // Under OSX, mousewheel deltas are floats, but fltk only supports ints.
  float s = Fl::screen_driver()->scale(0);
  float edx = [theEvent deltaX];
  float edy = [theEvent deltaY];
  int dx = roundf(edx / s);
  int dy = roundf(edy / s);
  // make sure that even small wheel movements count at least as one unit
  if (edx>0.0f) dx++; else if (edx<0.0f) dx--;
  if (edy>0.0f) dy++; else if (edy<0.0f) dy--;
  // allow both horizontal and vertical movements to be processed by the widget
  if (dx) {
    Fl::e_dx = -dx;
    Fl::e_dy = 0;
    Fl::handle( FL_MOUSEWHEEL, window );
  }
  if (dy) {
    Fl::e_dx = 0;
    Fl::e_dy = -dy;
    Fl::handle( FL_MOUSEWHEEL, window );
  }
  fl_unlock_function();
}

/*
 * Cocoa Magnify Gesture Handler
 */
static void cocoaMagnifyHandler(NSEvent *theEvent)
{
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
  fl_lock_function();
  Fl_Window *window = (Fl_Window*)[(FLWindow*)[theEvent window] getFl_Window];
  if ( !window->shown() ) {
    fl_unlock_function();
    return;
  }
  Fl::first_window(window);
  Fl::e_dy = [theEvent magnification]*1000; // 10.5.2
  if ( Fl::e_dy) {
    NSPoint pos = [theEvent locationInWindow];
    pos.y = window->h() - pos.y;
    NSUInteger mods = [theEvent modifierFlags];
    mods_to_e_state( mods );
    update_e_xy_and_e_xy_root([theEvent window]);
    Fl::handle( FL_ZOOM_GESTURE, window );
  }
  fl_unlock_function();
#endif
}

/*
 * Cocoa Mouse Button Handler
 */
static void cocoaMouseHandler(NSEvent *theEvent)
{
  static int keysym[] = { 0, FL_Button+1, FL_Button+3, FL_Button+2, FL_Button+4, FL_Button+5 };
  static int px, py;

  fl_lock_function();

  Fl_Window *window = (Fl_Window*)[(FLWindow*)[theEvent window] getFl_Window];
  if (!window || !window->shown() ) {
    fl_unlock_function();
    return;
  }
  NSPoint pos = [theEvent locationInWindow];
  float s = Fl::screen_driver()->scale(0);
  pos.x /= s; pos.y /= s;
  pos.y = window->h() - pos.y;
  NSInteger btn = [theEvent buttonNumber] + 1;
  NSUInteger mods = [theEvent modifierFlags];
  int sendEvent = 0;

  NSEventType etype = [theEvent type];
  if (etype == NSEventTypeLeftMouseDown || etype == NSEventTypeRightMouseDown ||
      etype == NSEventTypeOtherMouseDown) {
    if (btn == 1) Fl::e_state |= FL_BUTTON1;
    else if (btn == 3) Fl::e_state |= FL_BUTTON2;
    else if (btn == 2) Fl::e_state |= FL_BUTTON3;
    else if (btn == 4) Fl::e_state |= FL_BUTTON4;
    else if (btn == 5) Fl::e_state |= FL_BUTTON5;
  }
  else if (etype == NSEventTypeLeftMouseUp || etype == NSEventTypeRightMouseUp ||
           etype == NSEventTypeOtherMouseUp) {
    if (btn == 1) Fl::e_state &= ~FL_BUTTON1;
    else if (btn == 3) Fl::e_state &= ~FL_BUTTON2;
    else if (btn == 2) Fl::e_state &= ~FL_BUTTON3;
    else if (btn == 4) Fl::e_state &= ~FL_BUTTON4;
    else if (btn == 5) Fl::e_state &= ~FL_BUTTON5;
  }

  switch ( etype ) {
    case NSEventTypeLeftMouseDown:
    case NSEventTypeRightMouseDown:
    case NSEventTypeOtherMouseDown:
      sendEvent = FL_PUSH;
      Fl::e_is_click = 1;
      px = (int)pos.x; py = (int)pos.y;
      if ([theEvent clickCount] > 1)
        Fl::e_clicks++;
      else
        Fl::e_clicks = 0;
      // fall through
    case NSEventTypeLeftMouseUp:
    case NSEventTypeRightMouseUp:
    case NSEventTypeOtherMouseUp:
      if ( !window ) break;
      if ( !sendEvent ) {
        sendEvent = FL_RELEASE;
      }
      Fl::e_keysym = keysym[ btn ];
      // fall through
    case NSEventTypeMouseMoved:
      if ( !sendEvent ) {
        sendEvent = FL_MOVE;
      }
      // fall through
    case NSEventTypeLeftMouseDragged:
    case NSEventTypeRightMouseDragged:
    case NSEventTypeOtherMouseDragged: {
      if ( !sendEvent ) {
        sendEvent = FL_MOVE; // Fl::handle will convert into FL_DRAG
        if (fabs(pos.x-px)>5 || fabs(pos.y-py)>5)
          Fl::e_is_click = 0;
      }
      mods_to_e_state( mods );
      update_e_xy_and_e_xy_root([theEvent window]);
      if (fl_mac_os_version < 100500) {
        // before 10.5, mouse moved events aren't sent to borderless windows such as tooltips
        Fl_Window *tooltip = Fl_Tooltip::current_window();
        int inside = 0;
        if (tooltip && tooltip->shown() ) { // check if a tooltip window is currently opened
          // check if mouse is inside the tooltip
          inside = (Fl::event_x_root() >= tooltip->x() && Fl::event_x_root() < tooltip->x() + tooltip->w() &&
                    Fl::event_y_root() >= tooltip->y() && Fl::event_y_root() < tooltip->y() + tooltip->h() );
        }
        // if inside, send event to tooltip window instead of background window
        if (inside)
          window = tooltip;
      }
      Fl::handle( sendEvent, window );
      }
      break;
    case NSEventTypeMouseEntered :
      Fl::handle(FL_ENTER, window);
      break;
    case NSEventTypeMouseExited :
      Fl::handle(FL_LEAVE, window);
      break;
    default:
      break;
  }

  fl_unlock_function();

  return;
}

@interface FLTextView : NSTextView // this subclass is only needed under OS X < 10.6
{
  BOOL isActive;
}
+ (void)initialize;
+ (FLTextView*)singleInstance;
- (void)insertText:(id)aString;
- (void)doCommandBySelector:(SEL)aSelector;
- (void)setActive:(BOOL)a;
@end
static FLTextView *fltextview_instance = nil;
@implementation FLTextView
+ (void)initialize {
  NSRect rect={{0,0},{20,20}};
  fltextview_instance = [[FLTextView alloc] initWithFrame:rect];
}
+ (FLTextView*)singleInstance {
  return fltextview_instance;
}
- (void)insertText:(id)aString
{
  if (isActive) [[[NSApp keyWindow] contentView] insertText:aString];
}
- (void)doCommandBySelector:(SEL)aSelector
{
  [[[NSApp keyWindow] contentView] doCommandBySelector:aSelector];
}
- (void)setActive:(BOOL)a
{
  isActive = a;
}
@end


@interface FLWindowDelegate : NSObject
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
<NSWindowDelegate>
#endif
+ (void)initialize;
+ (FLWindowDelegate*)singleInstance;
- (void)windowDidMove:(NSNotification *)notif;
- (void)view_did_resize:(NSNotification *)notif;
- (void)windowDidResignKey:(NSNotification *)notif;
- (void)windowDidBecomeKey:(NSNotification *)notif;
- (void)windowDidBecomeMain:(NSNotification *)notif;
- (void)windowDidDeminiaturize:(NSNotification *)notif;
- (void)fl_windowMiniaturize:(NSNotification *)notif;
- (void)windowDidMiniaturize:(NSNotification *)notif;
- (void)windowWillEnterFullScreen:(NSNotification *)notif;
- (void)windowWillExitFullScreen:(NSNotification *)notif;
- (BOOL)windowShouldClose:(id)fl;
- (void)anyWindowWillClose:(NSNotification *)notif;
- (void)doNothing:(id)unused;
- (BOOL)window:(NSWindow *)window shouldPopUpDocumentPathMenu:(NSMenu *)menu;
@end


/* make subwindows re-appear after appl unhide or window deminiaturize
 (not necessary with 10.5 and above)
 */
static void orderfront_subwindows(FLWindow *xid)
{
  NSArray *children = [xid childWindows]; // 10.2
  NSEnumerator *enumerator = [children objectEnumerator];
  id child;
  while ((child = [enumerator nextObject]) != nil) { // this undo-redo seems necessary under 10.3
    [xid removeChildWindow:child];
    [xid addChildWindow:child ordered:NSWindowAbove];
    [child orderWindow:NSWindowAbove relativeTo:[xid windowNumber]];
    orderfront_subwindows(child);
  }
}


@interface FLWindowDelegateBefore10_6 : FLWindowDelegate
- (id)windowWillReturnFieldEditor:(NSWindow *)sender toObject:(id)client;
@end
@implementation FLWindowDelegateBefore10_6
- (id)windowWillReturnFieldEditor:(NSWindow *)sender toObject:(id)client
{
  return [FLTextView singleInstance];
}
@end

@interface FLWindowDelegateBefore10_5 : FLWindowDelegateBefore10_6
-(void)windowDidDeminiaturize:(NSNotification *)notif;
-(void)windowWillMiniaturize:(NSNotification *)notif;
@end
@implementation FLWindowDelegateBefore10_5
-(void)windowDidDeminiaturize:(NSNotification *)notif
{
  [super windowDidDeminiaturize:notif];
  fl_lock_function();
  orderfront_subwindows([notif object]);
  fl_unlock_function();
}
-(void)windowWillMiniaturize:(NSNotification *)notif
{
  [super fl_windowMiniaturize:notif];
  NSArray *children = [(NSWindow*)[notif object] childWindows]; // 10.2
  NSEnumerator *enumerator = [children objectEnumerator];
  id child;
  while ((child = [enumerator nextObject]) != nil) [child orderOut:self];
}
@end

// compute coordinates of the win top left in FLTK units
static void CocoatoFLTK(Fl_Window *win, int &x, int &y) {
  NSPoint ori;
  FLWindow *nsw = fl_xid(win);
  ori = [nsw convertBaseToScreen:NSMakePoint(0, [[nsw contentView] frame].size.height)];
  float s = Fl::screen_driver()->scale(0);
  x = (int)lround(ori.x / s);
  y = (int)lround((main_screen_height - ori.y) / s);
  while (win->parent()) {win = win->window(); x -= win->x(); y -= win->y();}
}

// return Cocoa coordinates of the point in window win at (x,y) FLTK units
static NSPoint FLTKtoCocoa(Fl_Window *win, int x, int y, int H) {
  float s = Fl::screen_driver()->scale(0);
  while (win->parent()) {win = win->window(); x += win->x(); y += win->y();}
  return NSMakePoint(round(x * s), main_screen_height - round((y + H)*s));
}

static FLWindowDelegate *flwindowdelegate_instance = nil;
@implementation FLWindowDelegate
+ (void)initialize
{
  if (self == [FLWindowDelegate self]) {
    if (fl_mac_os_version < 100500) flwindowdelegate_instance = [FLWindowDelegateBefore10_5 alloc];
    else if (fl_mac_os_version < 100600) flwindowdelegate_instance = [FLWindowDelegateBefore10_6 alloc];
    else flwindowdelegate_instance = [FLWindowDelegate alloc];
    flwindowdelegate_instance = [flwindowdelegate_instance init];
  }
}
+ (FLWindowDelegate*)singleInstance {
  return flwindowdelegate_instance;
}
- (void)windowDidMove:(NSNotification *)notif
{
  fl_lock_function();
  FLWindow *nsw = (FLWindow*)[notif object];
  Fl_Window *window = [nsw getFl_Window];
  if (!window->parent()) starting_moved_window = window;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
  FLView *view = (FLView*)[nsw contentView];
  if (views_use_CA && [view did_view_resolution_change]) {
    if (window->as_gl_window() && Fl::use_high_res_GL()) [view setNeedsDisplay:YES]; // necessary with  macOS ≥ 10.14.2; harmless before
  }
#endif
  if (window == starting_moved_window) {
    // we update 'main_screen_height' here because it's wrong just after screen config changes
    main_screen_height = CGDisplayBounds(CGMainDisplayID()).size.height;
    int X, Y;
    CocoatoFLTK(window, X, Y);
    if (window->x() != X || window->y() != Y) {
      if (!Fl_Cocoa_Window_Driver::driver(window)->through_resize())
         window->position(X, Y);
      else
        window->Fl_Widget::resize(X,Y,window->w(),window->h());
    }
    update_e_xy_and_e_xy_root(nsw);
    // at least since MacOS 10.9: OS moves subwindows contained in a moved window
    // setSubwindowFrame is no longer necessary.
    if (fl_mac_os_version < 100900) [nsw recursivelySendToSubwindows:@selector(setSubwindowFrame) applyToSelf:NO];
    if (window->parent()) [nsw recursivelySendToSubwindows:@selector(checkSubwindowFrame) applyToSelf:YES];
    starting_moved_window = NULL;
  }
  if (!window->parent()) {
    int nscreen = Fl::screen_num(window->x(), window->y(), window->w(), window->h());
    Fl_Window_Driver::driver(window)->screen_num(nscreen);
  }
  fl_unlock_function();
}

/*
 This method is called whenever the view of an Fl_Window changes size.

 This can happen for various reasons:

 - the user resizes a desktop window (NSViewFrameDidChangeNotification)
      Fl_Cocoa_Window_Driver::driver(window)->through_resize() == 0 for the top level window
      Fl_Window::is_a_rescale() == 0
 - the app scale is changed (the Cocoa size changes, but the FLTK size remains)
      Fl_Cocoa_Window_Driver::driver(window)->through_resize() == 1
      Fl_Window::is_a_rescale() == 1
 - a window is resized by application code: Fl_Window:resize()
      Fl_Cocoa_Window_Driver::driver(window)->through_resize() == 1
      Fl_Window::is_a_rescale() == 0

 Note that a top level window must be treated differently than a subwindow
 (an Fl_Window that is the child of another window).

 Also note, it's important to keep the logical FLTK coordinate system intact.
 Converting Cocoa coordinates into FLTK coordinates is not reliable because
 it loses precision if the screen scale is set to anything but 1:1.

 See also:
 Fl_Cocoa_Window_Driver::driver(window)->view_resized() avoid recursion
 Fl_Cocoa_Window_Driver::driver(window)->through_resize(); avoid recursion
 Fl_Cocoa_Window_Driver::driver(window)->changed_resolution(); tested OK
 */
- (void)view_did_resize:(NSNotification *)notif
{
  if (![[notif object] isKindOfClass:[FLView class]]) return;
  FLView *view = (FLView*)[notif object];
  FLWindow *nsw = (FLWindow*)[view window];
  if (!nsw || ![nsw getFl_Window]) return;
  fl_lock_function();
  Fl_Window *window = [nsw getFl_Window];

  int X, Y, W, H;
  float s = Fl::screen_driver()->scale(window->screen_num());
  if (Fl_Window::is_a_rescale()) {
    if (window->parent()) {
      X = window->x();
      Y = window->y();
    } else {
      // Recalculate the FLTK position from the current Cocoa position applying
      // the new scale, so the window stays at its current position after scaling.
      CocoatoFLTK(window, X, Y);
    }
    W = window->w();
    H = window->h();
  } else if (Fl_Cocoa_Window_Driver::driver(window)->through_resize()) {
    if (window->parent()) {
      X = window->x();
      Y = window->y();
    } else {
      // Recalculate the FLTK position from the current Cocoa position
      CocoatoFLTK(window, X, Y);
    }
    W = window->w();
    H = window->h();
  } else {
    CocoatoFLTK(window, X, Y);
    NSRect r = [view frame];
    W = (int)lround(r.size.width/s);
    H = (int)lround(r.size.height/s);
  }

  Fl_Cocoa_Window_Driver::driver(window)->view_resized(1);
  if (Fl_Cocoa_Window_Driver::driver(window)->through_resize()) {
    if (window->as_gl_window()) {
      static Fl_Cocoa_Plugin *plugin = NULL;
      if (!plugin) {
        Fl_Plugin_Manager pm("fltk:cocoa");
        plugin = (Fl_Cocoa_Plugin*)pm.plugin("gl.cocoa.fltk.org");
      }
      // calls Fl_Gl_Window::resize() without including Fl_Gl_Window.H
      plugin->resize(window->as_gl_window(), X, Y, W, H);
    } else {
      Fl_Cocoa_Window_Driver::driver(window)->resize(X, Y, W, H);
    }
  } else
    window->resize(X, Y, W, H);
  Fl_Cocoa_Window_Driver::driver(window)->view_resized(0);
  update_e_xy_and_e_xy_root(nsw);
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
  if (views_use_CA && !window->as_gl_window()) {
    [view reset_aux_bitmap];
    window->redraw();
  }
#endif
  if (!window->parent() && window->border() && Fl_Window_Driver::driver(window)->is_resizable()) {
    Fl_Cocoa_Window_Driver::driver(window)->is_maximized([nsw isZoomed] &&
                                                         !window->fullscreen_active());
  }
  fl_unlock_function();
}
- (void)windowDidResignKey:(NSNotification *)notif
{
  fl_lock_function();
  FLWindow *nsw = (FLWindow*)[notif object];
  Fl_Window *window = [nsw getFl_Window];
  /* Fullscreen windows obscure all other windows so we need to return
   to a "normal" level when the user switches to another window or another app */
  if (window->fullscreen_active()) {
    [nsw setLevel:NSNormalWindowLevel];
    fixup_window_levels();
  }
  // Situations such as opening a character palette produce windowDidResignKey but
  // [NSApp keyWindow] remains set to the resigning window. In that case, don't send FL_UNFOCUS
  if ([NSApp keyWindow] != nsw) Fl::handle(FL_UNFOCUS, window);
  fl_unlock_function();
}
- (void)windowDidBecomeKey:(NSNotification *)notif
{
  fl_lock_function();
  FLWindow *nsw = (FLWindow*)[notif object];
  Fl_Window *w = [nsw getFl_Window];
  /* Restore previous fullscreen level */
  if (w->fullscreen_active()
#  if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
      && (fl_mac_os_version < 100700 || !(nsw.styleMask & NSWindowStyleMaskFullScreen))
#endif
      ) {
    [nsw setLevel:NSStatusWindowLevel];
    fixup_window_levels();
  }
  Fl::handle( FL_FOCUS, w);
  fl_unlock_function();
}
- (void)windowDidBecomeMain:(NSNotification *)notif
{
  fl_lock_function();
  FLWindow *nsw = (FLWindow*)[notif object];
  Fl_Window *window = [nsw getFl_Window];
  Fl::first_window(window);
  if (!window->parent()) [nsw orderFront:nil];
  update_e_xy_and_e_xy_root(nsw);
  if (fl_sys_menu_bar && Fl_MacOS_Sys_Menu_Bar_Driver::window_menu_style()) {
    // select the corresponding Window menu item
    int index = Fl_MacOS_Sys_Menu_Bar_Driver::driver()->first_window_menu_item;
    while (index > 0) {
      Fl_Menu_Item *item = Fl_MacOS_Sys_Menu_Bar_Driver::driver()->window_menu_items + index;
      if (!item->label()) break;
      if (item->user_data() == window) {
        if (!item->value()) {
          item->setonly();
          fl_sys_menu_bar->update();
        }
        break;
      }
      index++;
    }
  }
  fl_unlock_function();
}
- (void)windowDidDeminiaturize:(NSNotification *)notif
{
  fl_lock_function();
  FLWindow *nsw = (FLWindow*)[notif object];
  if ([nsw miniwindowImage]) { [nsw setMiniwindowImage:nil]; }
  Fl_Window *window = [nsw getFl_Window];
  Fl::handle(FL_SHOW, window);
  // necessary when resolutions before miniaturization and after deminiaturization differ
  // or if GUI was resized while window was minimized
  [nsw recursivelySendToSubwindows:@selector(setSubwindowFrame) applyToSelf:YES];
  update_e_xy_and_e_xy_root(nsw);
  Fl::flush(); // Process redraws set by FL_SHOW.
  fl_unlock_function();
}
- (void)fl_windowMiniaturize:(NSNotification *)notif
{
  // subwindows are not captured in system-built miniature window image
  fl_lock_function();
  FLWindow *nsw = (FLWindow*)[notif object];
  if ([[nsw childWindows] count]) {
    Fl_Window *window = [nsw getFl_Window];
    // capture the window and its subwindows and use as miniature window image
    NSBitmapImageRep *bitmap = rect_to_NSBitmapImageRep_subwins(window, 0, 0, window->w(), window->h(), true);
    if (bitmap) {
      NSImage *img = [[[NSImage alloc] initWithSize:NSMakeSize([bitmap pixelsWide], [bitmap pixelsHigh])] autorelease];
      [img addRepresentation:bitmap];
      [bitmap release];
      [nsw setMiniwindowImage:img];
    }
  }
  fl_unlock_function();
}
- (void)windowDidMiniaturize:(NSNotification *)notif
{
  if (fl_mac_os_version >= 100500) [self fl_windowMiniaturize:notif];
  fl_lock_function();
  FLWindow *nsw = (FLWindow*)[notif object];
  Fl_Window *window = [nsw getFl_Window];
  Fl::handle(FL_HIDE, window);
  fl_unlock_function();
}
- (void)windowWillEnterFullScreen:(NSNotification *)notif;
{
  FLWindow *nsw = (FLWindow*)[notif object];
  Fl_Window *window = [nsw getFl_Window];
  window->_set_fullscreen();
}
- (void)windowWillExitFullScreen:(NSNotification *)notif;
{
  FLWindow *nsw = (FLWindow*)[notif object];
  Fl_Window *window = [nsw getFl_Window];
  window->_clear_fullscreen();
}
- (BOOL)windowShouldClose:(id)fl
{
  fl_lock_function();
  Fl_Window *win = [(FLWindow *)fl getFl_Window];
  if (win) Fl::handle(FL_CLOSE, win); // this might or might not close the window
  fl_unlock_function();
  // the system doesn't need to send [fl close] because FLTK does it when needed
  return NO;
}
- (void)anyWindowWillClose:(NSNotification *)notif
{
  fl_lock_function();
  if ([[notif object] isKeyWindow]) {
    // If the closing window is the key window,
    // find a bordered top-level window to become the new key window
    Fl_Window *w = Fl::first_window();
    while (w && (w->parent() || !w->border() || !w->visible())) {
      w = Fl::next_window(w);
    }
    if (w) {
      [fl_mac_xid(w) makeKeyWindow];
    }
  }
  fl_unlock_function();
}
- (void)doNothing:(id)unused
{
  return;
}
- (BOOL)window:(NSWindow *)window shouldPopUpDocumentPathMenu:(NSMenu *)menu {
  return NO;
}
@end

@interface FLAppDelegate : NSObject
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
<NSApplicationDelegate>
#endif
{
  @public
  open_cb_f_type open_cb;
  TSMDocumentID currentDoc;
}
- (BOOL)applicationSupportsSecureRestorableState:(NSApplication *)app;
- (void)applicationDidFinishLaunching:(NSNotification *)notification;
- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication*)sender;
- (void)applicationDidBecomeActive:(NSNotification *)notify;
- (void)applicationDidChangeScreenParameters:(NSNotification *)aNotification;
- (void)applicationDidUpdate:(NSNotification *)aNotification;
- (void)applicationWillResignActive:(NSNotification *)notify;
- (void)applicationWillHide:(NSNotification *)notify;
- (void)applicationWillUnhide:(NSNotification *)notify;
- (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filename;
@end

@implementation FLAppDelegate
- (BOOL)applicationSupportsSecureRestorableState:(NSApplication *)app {
  // Avoids macOS 14 warning message when app is launched from command line:
  // "WARNING: Secure coding is automatically enabled for restorable state!
  // However, not on all supported macOS versions of this application.
  // Opt-in to secure coding explicitly by implementing
  // NSApplicationDelegate.applicationSupportsSecureRestorableState:."
  return (fl_mac_os_version >= 140000);
}
- (void)applicationDidFinishLaunching:(NSNotification *)notification
{
    if (fl_mac_os_version >= 101300 && [NSApp isRunning]) [NSApp stop:nil];
}
- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication*)sender
{
  fl_lock_function();
  while ( Fl_X::first ) {
    Fl_Window *win = Fl::first_window();
    if (win->parent()) win = win->top_window();
    Fl_Widget_Tracker wt(win); // track the window object
    Fl::handle(FL_CLOSE, win);
    if (wt.exists() && win->shown()) { // the user didn't close win
      break;
    }
  }
  fl_unlock_function();
  if ( ! Fl::first_window() ) {
    Fl::program_should_quit(1);
    Fl_Cocoa_Screen_Driver::breakMacEventLoop(); // necessary when called through menu and in Fl::wait()
  }
  return NSTerminateCancel;
}
- (void)applicationDidBecomeActive:(NSNotification *)notify
{
  fl_lock_function();

  // update clipboard status
  clipboard_check();

  /**
   * Cocoa organizes the Z depth of windows on a global priority. FLTK however
   * expects the window manager to organize Z level by application. The trickery
   * below will change Z order during activation and deactivation.
   */
  fixup_window_levels();

  fl_unlock_function();
}
- (void)applicationDidChangeScreenParameters:(NSNotification *)unused
{ // react to changes in screen numbers and positions
  fl_lock_function();
  main_screen_height = CGDisplayBounds(CGMainDisplayID()).size.height;
  Fl::call_screen_init();
  Fl::handle(FL_SCREEN_CONFIGURATION_CHANGED, NULL);
  fl_unlock_function();
}
- (void)applicationDidUpdate:(NSNotification *)aNotification
{
  if (im_enabled != -1) {
    TSMDocumentID newDoc;
    // It is extremely unclear when Cocoa decides to create/update
    // the input context, but debugging reveals that it is done
    // by NSApplication:updateWindows. So check if the input context
    // has shifted after each such run so that we can update our
    // input methods status.
    newDoc = TSMGetActiveDocument();
    if (newDoc != currentDoc) {
      TSMDocumentID doc;

      doc = TSMGetActiveDocument();

      if (im_enabled)
        TSMRemoveDocumentProperty(doc, kTSMDocumentEnabledInputSourcesPropertyTag);
      else {
        CFArrayRef inputSources;
        CFDictionaryRef filter;
        // FLΤΚ previously used TISCreateASCIICapableInputSourceList(),
        // which mostly hits the mark. But it excludes things like Greek
        // and Cyrillic keyboards. So let's be more explicit.
        filter = CFDictionaryCreate(NULL, (const void **)kTISPropertyInputSourceType,
                                          (const void **)kTISTypeKeyboardLayout,
                                          1, NULL, NULL);
        inputSources = TISCreateInputSourceList(filter, false);
        CFRelease(filter);
        TSMSetDocumentProperty(doc, kTSMDocumentEnabledInputSourcesPropertyTag,
                               sizeof(CFArrayRef), &inputSources);
        CFRelease(inputSources);
      }
      currentDoc = newDoc;
    }
  }
}
- (void)applicationWillResignActive:(NSNotification *)notify
{
  fl_lock_function();
  Fl_X *x;
  FLWindow *top = 0;
  // sort in all regular windows
  for (x = Fl_X::first;x;x = x->next) {
    FLWindow *cw = (FLWindow*)x->xid;
    Fl_Window *win = x->w;
    if (win && cw) {
      if (win->modal()) {
      } else if (win->non_modal()) {
      } else {
        if (!top) top = cw;
      }
    }
  }
  // now sort in all modals
  for (x = Fl_X::first;x;x = x->next) {
    FLWindow *cw = (FLWindow*)x->xid;
    Fl_Window *win = x->w;
    if (win && cw && [cw isVisible]) {
      if (win->modal()) {
        [cw setLevel:NSNormalWindowLevel];
        if (top) [cw orderWindow:NSWindowAbove relativeTo:[top windowNumber]];
      }
    }
  }
  // finally all non-modals
  for (x = Fl_X::first;x;x = x->next) {
    FLWindow *cw = (FLWindow*)x->xid;
    Fl_Window *win = x->w;
    if (win && cw && [cw isVisible]) {
      if (win->non_modal()) {
        [cw setLevel:NSNormalWindowLevel];
        if (top) [cw orderWindow:NSWindowAbove relativeTo:[top windowNumber]];
      }
    }
  }
  fl_unlock_function();
}
- (void)applicationWillHide:(NSNotification *)notify
{
  fl_lock_function();
  Fl_X *x;
  for (x = Fl_X::first;x;x = x->next) {
    Fl_Window *window = x->w;
    if ( !window->parent() ) Fl::handle( FL_HIDE, window);
    }
  fl_unlock_function();
}
- (void)applicationWillUnhide:(NSNotification *)notify
{
  fl_lock_function();
  for (Fl_X *x = Fl_X::first;x;x = x->next) {
    Fl_Window *w = x->w;
    if ( !w->parent() && ![(FLWindow*)x->xid isMiniaturized]) {
      Fl::handle(FL_SHOW, w);
      }
  }
  fl_unlock_function();
}
- (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filename
{
  if (fl_mac_os_version < 101300) {
  // without the next two statements, the opening of the 1st window is delayed by several seconds
  // under 10.8 ≤ Mac OS < 10.13 when a file is dragged on the application icon
    Fl_Window *firstw = Fl::first_window();
    if (firstw) firstw->wait_for_expose();
  } else if (in_nsapp_run) { // memorize all dropped filenames
    if (!dropped_files_list) dropped_files_list = [[NSMutableArray alloc] initWithCapacity:1];
    [dropped_files_list addObject:filename];
    return YES;
  }
  if (open_cb) {
    fl_lock_function();
    (*open_cb)([filename UTF8String]);
    Fl::flush(); // useful for AppleScript that does not break the event loop
    fl_unlock_function();
    return YES;
  }
  return NO;
}
@end

@interface FLAppDelegateBefore10_5 : FLAppDelegate
- (void)applicationDidUnhide:(NSNotification *)notify;
- (void)applicationDidUpdate:(NSNotification *)aNotification;
@end
@implementation FLAppDelegateBefore10_5
- (void)applicationDidUnhide:(NSNotification *)notify
{ // before 10.5, subwindows are lost when application is unhidden
  fl_lock_function();
  for (Fl_X *x = Fl_X::first; x; x = x->next) {
    if (![(FLWindow*)x->xid parentWindow]) {
      orderfront_subwindows((FLWindow*)x->xid);
    }
  }
  fl_unlock_function();
}
- (void)applicationDidUpdate:(NSNotification *)aNotification
{
}
@end

static void drain_dropped_files_list() {
  open_cb_f_type open_cb = ((FLAppDelegate*)[NSApp delegate])->open_cb;
  if (!open_cb) {
    [dropped_files_list removeAllObjects];
    [dropped_files_list release];
    dropped_files_list = nil;
    return;
  }
  NSString *s = (NSString*)[dropped_files_list objectAtIndex:0];
  char *fname = fl_strdup([s UTF8String]);
  [dropped_files_list removeObjectAtIndex:0];
  if ([dropped_files_list count] == 0) {
    [dropped_files_list release];
    dropped_files_list = nil;
  }
  open_cb(fname);
  free(fname);
}

/*
 * Install an open documents event handler...
 */
void Fl_Darwin_System_Driver::open_callback(void (*cb)(const char *)) {
  fl_open_display();
  ((FLAppDelegate*)[NSApp delegate])->open_cb = cb;
}

@implementation FLApplication
+ (void)sendEvent:(NSEvent *)theEvent
{
  if (fl_send_system_handlers(theEvent))
    return;

  NSEventType type = [theEvent type];
  if (type == NSEventTypeLeftMouseDown) {
    fl_lock_function();
    Fl_Window *grab = Fl::grab();
    if (grab) {
      FLWindow *win = (FLWindow *)[theEvent window];
      if ( [win isKindOfClass:[FLWindow class]] && grab != [win getFl_Window]) {
        // a click event out of a menu window, so we should close this menu
        // done here to catch also clicks on window title bar/resize box
        cocoaMouseHandler(theEvent);
      }
    }
    fl_unlock_function();
  } else if (type == NSEventTypeApplicationDefined) {
    if ([theEvent subtype] == FLTKDataReadyEvent) {
      processFLTKEvent();
    }
    return;
  } else if (type == NSEventTypeKeyUp) {
    // The default sendEvent turns key downs into performKeyEquivalent when
    // modifiers are down, but swallows the key up if the modifiers include
    // command.  This one makes all modifiers consistent by always sending key ups.
    // FLView treats performKeyEquivalent to keyDown, but performKeyEquivalent is
    // still needed for the system menu.
    [[NSApp keyWindow] sendEvent:theEvent];
    return;
    }
  [NSApp sendEvent:theEvent];
}
@end

/* Prototype of undocumented function needed to support Mac OS 10.2 or earlier
 extern "C" {
  OSErr CPSEnableForegroundOperation(ProcessSerialNumber*, UInt32, UInt32, UInt32, UInt32);
}
*/

static BOOL is_bundled() {
  static int value = 2;
  if (value == 2) {
    value = 1;
    NSBundle *bundle = [NSBundle mainBundle];
    if (bundle) {
      NSString *exe = [[bundle executablePath] stringByStandardizingPath];
      NSString *bpath = [[bundle bundlePath] stringByStandardizingPath];
      NSString *exe_dir = [exe stringByDeletingLastPathComponent];
//NSLog(@"exe=%@ bpath=%@ exe_dir=%@",exe, bpath, exe_dir);
      if ([bpath isEqualToString:exe] || [bpath isEqualToString:exe_dir]) value = 0;
    } else value = 0;
  }
  return value == 1;
}


static void foreground_and_activate() {
  if ( !is_bundled() ) { // only transform the application type for unbundled apps
    ProcessSerialNumber cur_psn = { 0, kCurrentProcess };
    TransformProcessType(&cur_psn, kProcessTransformToForegroundApplication); // needs Mac OS 10.3
    /* support of Mac OS 10.2 or earlier used this undocumented call instead
     err = CPSEnableForegroundOperation(&cur_psn, 0x03, 0x3C, 0x2C, 0x1103);
     */
  }
  [NSApp activateIgnoringOtherApps:YES];
}

// simpler way to activate application tested OK on MacOS 10.3 10.6 10.9 10.13 and 10.14 public beta

void Fl_Cocoa_Screen_Driver::open_display_platform() {
  static char beenHereDoneThat = 0;
  if ( !beenHereDoneThat ) {
    beenHereDoneThat = 1;

    BOOL need_new_nsapp = (NSApp == nil);
    if (need_new_nsapp) [NSApplication sharedApplication];
    NSAutoreleasePool *localPool;
    localPool = [[NSAutoreleasePool alloc] init]; // never released
    FLAppDelegate *delegate = (Fl_Darwin_System_Driver::calc_mac_os_version() < 100500 ? [FLAppDelegateBefore10_5 alloc] : [FLAppDelegate alloc]);
    [(NSApplication*)NSApp setDelegate:[delegate init]];
    if (need_new_nsapp) {
      if (fl_mac_os_version >= 101300 && fl_mac_os_version < 140000 && is_bundled()) {
        [NSApp activateIgnoringOtherApps:YES];
        in_nsapp_run = true;
        [NSApp run];
        in_nsapp_run = false;
      }
      else {
        [NSApp finishLaunching];
        // Unbundled app may require this so delegate receives applicationDidFinishLaunching:
        // even if doc states this is sent at the end of finishLaunching.
        if (!is_bundled()) [NSApp nextEventMatchingMask:NSEventMaskAny
                                              untilDate:nil
                                                 inMode:NSDefaultRunLoopMode
                                                dequeue:NO];
      }
    }
    if (fl_mac_os_version < 140000) {
      // empty the event queue but keep system events for drag&drop of files at launch
      NSEvent *ign_event;
       do ign_event = [NSApp nextEventMatchingMask:(NSEventMaskAny & ~NSEventMaskSystemDefined)
       untilDate:[NSDate dateWithTimeIntervalSinceNow:0]
       inMode:NSDefaultRunLoopMode
       dequeue:YES];
       while (ign_event);
    }
    if (![NSApp isActive]) foreground_and_activate();
    if (![NSApp servicesMenu]) createAppleMenu();
    else Fl_Sys_Menu_Bar::window_menu_style(Fl_Sys_Menu_Bar::no_window_menu);
    main_screen_height = CGDisplayBounds(CGMainDisplayID()).size.height;
    [[NSNotificationCenter defaultCenter] addObserver:[FLWindowDelegate singleInstance]
                                             selector:@selector(anyWindowWillClose:)
                                                 name:NSWindowWillCloseNotification
                                               object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:[FLWindowDelegate singleInstance]
                                             selector:@selector(view_did_resize:)
                                                 name:NSViewFrameDidChangeNotification
                                               object:nil];
    if (![NSThread isMultiThreaded]) {
      // With old OS X versions, it is necessary to create one thread for secondary pthreads to be
      // allowed to use cocoa, especially to create an NSAutoreleasePool.
      // We create a thread that does nothing so it completes very fast:
      [NSThread detachNewThreadSelector:@selector(doNothing:) toTarget:[FLWindowDelegate singleInstance] withObject:nil];
    }
    (void)localPool; // silence warning
  }
}


// Force a "Roman" or "ASCII" keyboard, which both the Mozilla and
// Safari people seem to think implies turning off advanced IME stuff
// (see nsTSMManager::SyncKeyScript in Mozilla and enableSecureTextInput
// in Safari/Webcore). Should be good enough for us then...

static int input_method_startup()
{
  static int retval = -1; // -1: not initialized, 0: not usable, 1: ready for use
  if (retval == -1) {
    fl_open_display();
    if (fl_mac_os_version >= 100500) {
      // These symbols are no longer visible in Apple doc.
      // They do exist in Carbon.framework --> HIToolbox.framework --> TextServices.h
      TSMGetActiveDocument = (TSMGetActiveDocument_type)Fl_Darwin_System_Driver::get_carbon_function("TSMGetActiveDocument");
      TSMSetDocumentProperty = (TSMSetDocumentProperty_type)Fl_Darwin_System_Driver::get_carbon_function("TSMSetDocumentProperty");
      TSMRemoveDocumentProperty = (TSMRemoveDocumentProperty_type)Fl_Darwin_System_Driver::get_carbon_function("TSMRemoveDocumentProperty");
      // These symbols are no longer visible in Apple doc.
      // They do exist in Carbon.framework --> HIToolbox.framework --> TextInputSources.h
      TISCreateInputSourceList = (TISCreateInputSourceList_type)Fl_Darwin_System_Driver::get_carbon_function("TISCreateInputSourceList");
      kTISTypeKeyboardLayout = (CFStringRef)Fl_Darwin_System_Driver::get_carbon_function("kTISTypeKeyboardLayout");
      kTISPropertyInputSourceType = (CFStringRef)Fl_Darwin_System_Driver::get_carbon_function("kTISPropertyInputSourceType");
      retval = (TSMGetActiveDocument && TSMSetDocumentProperty && TSMRemoveDocumentProperty && TISCreateInputSourceList && kTISTypeKeyboardLayout && kTISPropertyInputSourceType ? 1 : 0);
    } else {
      KeyScript = (KeyScript_type)Fl_Darwin_System_Driver::get_carbon_function("KeyScript");
      retval = (KeyScript? 1 : 0);
    }
  }
  return retval;
}

void Fl_Cocoa_Screen_Driver::enable_im() {
  if (!input_method_startup()) return;

  im_enabled = 1;

  if (fl_mac_os_version >= 100500) {
    ((FLAppDelegate*)[NSApp delegate])->currentDoc = NULL;
    [NSApp updateWindows]; // triggers [FLAppDelegate applicationDidUpdate]
  }
  else
    KeyScript(-7/*smKeyEnableKybds*/);
}

void Fl_Cocoa_Screen_Driver::disable_im() {
  if (!input_method_startup()) return;

  im_enabled = 0;

  if (fl_mac_os_version >= 100500) {
    ((FLAppDelegate*)[NSApp delegate])->currentDoc = NULL;
    [NSApp updateWindows]; // triggers [FLAppDelegate applicationDidUpdate]
  }
  else
    KeyScript(smEnableRomanKybdsOnly);
}


// Gets the border sizes and the titlebar height
static int get_window_frame_sizes(Fl_Window *win, int *pbx, int *pby) {
  if (pbx) *pbx = 0; if (pby) *pby = 0;
  if (win && !win->border()) return 0;
  FLWindow *flw = fl_xid(win);
  if (flw) {
    return [flw frame].size.height - [[flw contentView] frame].size.height;
  }
  static int top = 0, left, bottom;
  if (!top) {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSRect inside = { {20,20}, {100,100} };
    NSRect outside = [NSWindow frameRectForContentRect:inside
                                             styleMask:NSWindowStyleMaskTitled];
    left = int(outside.origin.x - inside.origin.x);
    bottom = int(outside.origin.y - inside.origin.y);
    top = int(outside.size.height - inside.size.height) - bottom;
    [pool release];
    }
  if (pbx) *pbx = left;
  if (pby) *pby = bottom;
  return top;
}

void Fl_Cocoa_Window_Driver::decoration_sizes(int *top, int *left,  int *right, int *bottom) {
  *top = get_window_frame_sizes(pWindow, left, bottom);
  *right = *left;
}

/*
 * smallest x coordinate in screen space of work area of menubar-containing display
 */
int Fl_Cocoa_Screen_Driver::x() {
  open_display();
  return int([[[NSScreen screens] objectAtIndex:0] visibleFrame].origin.x) / scale(0);
}


/*
 * smallest y coordinate in screen space of work area of menubar-containing display
 */
int Fl_Cocoa_Screen_Driver::y() {
  open_display();
  NSRect visible = [[[NSScreen screens] objectAtIndex:0] visibleFrame];
  return int(main_screen_height - (visible.origin.y + visible.size.height)) / scale(0);
}


/*
 * width of work area of menubar-containing display
 */
int Fl_Cocoa_Screen_Driver::w() {
  open_display();
  return int([[[NSScreen screens] objectAtIndex:0] visibleFrame].size.width) / scale(0);
}


/*
 * height of work area of menubar-containing display
 */
int Fl_Cocoa_Screen_Driver::h() {
  open_display();
  return int([[[NSScreen screens] objectAtIndex:0] visibleFrame].size.height) / scale(0);
}

// computes the work area of the nth screen (screen #0 has the menubar)
void Fl_Cocoa_Screen_Driver::screen_work_area(int &X, int &Y, int &W, int &H, int n)
{
  if (num_screens < 0) init();
  if (n < 0 || n >= num_screens) n = 0;
  open_display();
  NSRect r = [[[NSScreen screens] objectAtIndex:n] visibleFrame];
  X   = int(r.origin.x) / scale(0);
  Y   = (main_screen_height - int(r.origin.y + r.size.height)) / scale(0);
  W   = int(r.size.width) / scale(0);
  H   = int(r.size.height) / scale(0);
}

/*
 * get the current mouse pointer world coordinates
 */
int Fl_Cocoa_Screen_Driver::get_mouse(int &x, int &y)
{
  open_display();
  NSPoint pt = [NSEvent mouseLocation];
  x = int(pt.x);
  y = int(main_screen_height - pt.y);
  return screen_num(x/scale(0), y/scale(0));
}


static int fake_X_wm(Fl_Window* w,int &X,int &Y, int &bt,int &bx, int &by) {
  int W, H, xoff, yoff, dx, dy;
  int ret = bx = by = bt = 0;
  if (w->border() && !w->parent()) {
    int minw, minh, maxw, maxh;
    w->get_size_range(&minw, &minh, &maxw, &maxh, NULL, NULL, NULL);
    if (maxw != minw || maxh != minh) {
      ret = 2;
    } else {
      ret = 1;
    }
    bt = get_window_frame_sizes(w, &bx, &by);
  }
  if (w->parent()) return 0;
  // The coordinates of the whole window, including non-client area
  xoff = bx;
  yoff = by + bt;
  dx = 2*bx;
  dy = 2*by + bt;
  float s = Fl::screen_driver()->scale(0);
  X = round(w->x()*s)-xoff;
  Y = round(w->y()*s)-yoff;
  W = w->w()*s+dx;
  H = w->h()*s+dy;

  // Proceed to positioning the window fully inside the screen, if possible

  // let's get a little elaborate here. Mac OS X puts a lot of stuff on the desk
  // that we want to avoid when positioning our window, namely the Dock and the
  // top menu bar (and even more stuff in 10.4 Tiger). So we will go through the
  // list of all available screens and find the one that this window is most
  // likely to go to, and then reposition it to fit withing the 'good' area.
  //  Rect r;
  // find the screen, that the center of this window will fall into
  int R = X+W, B = Y+H; // right and bottom
  int cx = (X+R)/2, cy = (Y+B)/2; // center of window;
  NSScreen *gd = NULL;
  NSArray *a = [NSScreen screens]; int count = (int)[a count]; NSRect r; int i;
  for( i = 0; i < count; i++) {
    r = [[a objectAtIndex:i] frame];
    r.origin.y = main_screen_height - (r.origin.y + r.size.height); // use FLTK's multiscreen coordinates
    if (   cx >= r.origin.x && cx <= r.origin.x + r.size.width
        && cy >= r.origin.y && cy <= r.origin.y + r.size.height)
      break;
  }
  if (i < count) gd = [a objectAtIndex:i];

  // if the center doesn't fall on a screen, try the top left
  if (!gd) {
    for( i = 0; i < count; i++) {
      r = [[a objectAtIndex:i] frame];
      r.origin.y = main_screen_height - (r.origin.y + r.size.height); // use FLTK's multiscreen coordinates
      if (    X >= r.origin.x && X <= r.origin.x + r.size.width
          && Y >= r.origin.y  && Y <= r.origin.y + r.size.height)
        break;
    }
    if (i < count) gd = [a objectAtIndex:i];
  }
  // if that doesn't fall on a screen, try the top right
  if (!gd) {
    for( i = 0; i < count; i++) {
      r = [[a objectAtIndex:i] frame];
      r.origin.y = main_screen_height - (r.origin.y + r.size.height); // use FLTK's multiscreen coordinates
      if (    R >= r.origin.x && R <= r.origin.x + r.size.width
          && Y >= r.origin.y  && Y <= r.origin.y + r.size.height)
        break;
    }
    if (i < count) gd = [a objectAtIndex:i];
  }
  // if that doesn't fall on a screen, try the bottom left
  if (!gd) {
    for( i = 0; i < count; i++) {
      r = [[a objectAtIndex:i] frame];
      r.origin.y = main_screen_height - (r.origin.y + r.size.height); // use FLTK's multiscreen coordinates
      if (    X >= r.origin.x && X <= r.origin.x + r.size.width
          && Y+H >= r.origin.y  && Y+H <= r.origin.y + r.size.height)
        break;
    }
    if (i < count) gd = [a objectAtIndex:i];
  }
  // last resort, try the bottom right
  if (!gd) {
    for( i = 0; i < count; i++) {
      r = [[a objectAtIndex:i] frame];
      r.origin.y = main_screen_height - (r.origin.y + r.size.height); // use FLTK's multiscreen coordinates
      if (    R >= r.origin.x && R <= r.origin.x + r.size.width
          && Y+H >= r.origin.y  && Y+H <= r.origin.y + r.size.height)
        break;
    }
    if (i < count) gd = [a objectAtIndex:i];
  }
  // if we still have not found a screen, we will use the main
  // screen, the one that has the application menu bar.
  if (!gd) gd = [a objectAtIndex:0];
  if (gd) {
    r = [gd visibleFrame];
    r.origin.y = main_screen_height - (r.origin.y + r.size.height); // use FLTK's multiscreen coordinates
    if ( R > r.origin.x + r.size.width ) X -= int(R - (r.origin.x + r.size.width));
    if ( B > r.size.height + r.origin.y ) Y -= int(B - (r.size.height + r.origin.y));
    if ( X < r.origin.x ) X = int(r.origin.x);
    if ( Y < r.origin.y ) Y = int(r.origin.y);
  }

  // Return the client area's top left corner in (X,Y)
  X+=xoff;
  Y+=yoff;
  X /= s;
  Y /= s;

  return ret;
}


Fl_Window *fl_dnd_target_window = 0;

static void  q_set_window_title(NSWindow *nsw, const char * name, const char *mininame) {
  CFStringRef title = CFStringCreateWithCString(NULL, (name ? name : ""), kCFStringEncodingUTF8);
  if(!title) { // fallback when name contains malformed UTF-8
    int l = (int)strlen(name);
    unsigned short* utf16 = new unsigned short[l + 1];
    l = fl_utf8toUtf16(name, l, utf16, l + 1);
    title = CFStringCreateWithCharacters(NULL, utf16, l);
    delete[] utf16;
    }
  [nsw setTitle:(NSString*)title];
  CFRelease(title);
  if (mininame && strlen(mininame)) {
    CFStringRef minititle = CFStringCreateWithCString(NULL, mininame, kCFStringEncodingUTF8);
    if (minititle) {
      [nsw setMiniwindowTitle:(NSString*)minititle];
      CFRelease(minititle);
    }
  }
}

/**                 How FLTK handles Mac OS text input

 Let myview be the instance of the FLView class that has the keyboard focus. FLView is an FLTK-defined NSView subclass
 that implements the NSTextInputClient protocol to properly handle text input. It also implements the old NSTextInput
 protocol to run with OS <= 10.4. The few NSTextInput protocol methods that differ in signature from the NSTextInputClient
 protocol transmit the received message to the corresponding NSTextInputClient method.

 Keyboard input sends keyDown: and performKeyEquivalent: messages to myview. The latter occurs for keys such as
 ForwardDelete, arrows and F1, and when the Ctrl or Cmd modifiers are used. Other key presses send keyDown: messages.
 The keyDown: method calls [myview process_keydown:theEvent] that is equivalent to
 [[myview inputContext] handleEvent:theEvent], and triggers system processing of keyboard events.
 The performKeyEquivalent: method directly calls Fl::handle(FL_KEYBOARD, focus-window)
 when the Ctrl or Cmd modifiers are used. If not, it also calls [[myview inputContext] handleEvent:theEvent].
 The performKeyEquivalent: method returns YES when the keystroke has been handled and NO otherwise, which allows
 shortcuts of the system menu to be processed. Three sorts of messages are then sent back by the system to myview:
 doCommandBySelector:, setMarkedText: and insertText:. All 3 messages eventually produce Fl::handle(FL_KEYBOARD, win) calls.
 The doCommandBySelector: message allows to process events such as new-line, forward and backward delete, arrows,
 escape, tab, F1. The message setMarkedText: is sent when marked text, that is, temporary text that gets replaced later
 by some other text, is inserted. This happens when a dead key is pressed, and also
 when entering complex scripts (e.g., Chinese). Fl_Cocoa_Screen_Driver::next_marked_length gives the byte
 length of marked text before the FL_KEYBOARD event is processed. Fl::compose_state gives this length after this processing.
 Message insertText: is sent to enter text in the focused widget. If there's marked text, Fl::compose_state is > 0, and this
 marked text gets replaced by the inserted text. If there's no marked text, the new text is inserted at the insertion point.
 When the character palette is used to enter text, the system sends an insertText: message to myview.
 The in_key_event field of the FLView class allows to differentiate keyboard from palette inputs.

 During processing of the handleEvent message, inserted and marked strings are concatenated in a single string
 inserted in a single FL_KEYBOARD event after return from handleEvent. The need_handle member variable of FLView allows
 to determine when setMarkedText or insertText strings have been sent during handleEvent processing and must trigger
 an FL_KEYBOARD event. Concatenating two insertText operations or an insertText followed by a setMarkedText is possible.
 In contrast, setMarkedText followed by insertText or by another setMarkedText isn't correct if concatenated in a single
 string. Thus, in such case, the setMarkedText and the next operation produce each an FL_KEYBOARD event.

 OS >= 10.7 contains a feature where pressing and holding certain keys opens a menu window that shows a list
 of possible accented variants of this key. The selectedRange field of the FLView class and the selectedRange, insertText:
 and setMarkedText: methods of the NSTextInputClient protocol are used to support this feature.
 The notion of selected text (!= marked text) is monitored by the selectedRange field.
 The -(NSRange)[FLView selectedRange] method is used to control whether an FLTK widget opens accented character windows
 by returning .location = NSNotFound to disable that, or returning the value of the selectedRange field to enable the feature.
 When selectedRange.location >= 0, the value of selectedRange.length is meaningful. 0 means no text is currently selected,
 > 0 means this number of characters before the insertion point are selected. The insertText: method does
 selectedRange = NSMakeRange(100, 0); to indicate no text is selected. The setMarkedText: method does
 selectedRange = NSMakeRange(100, newSelection.length); to indicate that this length of text is selected.

 With OS <= 10.5, the NSView class does not implement the inputContext message. [myview process_keydown:theEvent] is
 equivalent to [[FLTextInputContext singleInstance] handleEvent:theEvent].
 Method +[FLTextInputContext singleInstance] returns an instance of class FLTextInputContext that possesses
 a handleEvent: method. The class FLTextView implements the so-called view's "field editor". This editor is an instance
 of the FLTextView class allocated by the -(id)[FLWindowDelegate windowWillReturnFieldEditor: toObject:] method.
 The -(BOOL)[FLTextInputContext handleEvent:] method emulates the missing 10.6 -(BOOL)[NSTextInputContext handleEvent:]
 by sending the interpretKeyEvents: message to the FLTextView object. The system sends back doCommandBySelector: and
 insertText: messages to the FLTextView object that are transmitted unchanged to myview to be processed as with OS >= 10.6.
 The system also sends setMarkedText: messages directly to myview.

 There is furthermore an oddity of dead key processing with OS <= 10.5. It occurs when a dead key followed by a non-accented
 key are pressed. Say, for example, that keys '^' followed by 'p' are pressed on a French or German keyboard. Resulting
 messages are: [myview setMarkedText:@"^"], [myview insertText:@"^"], [myview insertText:@"p"], [FLTextView insertText:@"^p"].
 The 2nd '^' replaces the marked 1st one, followed by p^p. The resulting text in the widget is "^p^p" instead of the
 desired "^p". To avoid that, the FLTextView object is deactivated by the insertText: message and reactivated after
 the handleEvent: message has been processed.

 NSEvent's during a character composition sequence:
 - keyDown with deadkey -> [[theEvent characters] length] is 0
 - keyUp -> [theEvent characters] contains the deadkey
 - keyDown with next key -> [theEvent characters] contains the composed character
 - keyUp -> [theEvent characters] contains the standard character
 */

static void cocoaKeyboardHandler(NSEvent *theEvent)
{
  NSUInteger mods;
  // get the modifiers
  mods = [theEvent modifierFlags];
  // get the key code
  UInt32 keyCode = 0, maskedKeyCode = 0;
  unsigned short sym = 0;
  keyCode = [theEvent keyCode];
  // extended keyboards can also send sequences on key-up to generate Kanji etc. codes.
  // Some observed prefixes are 0x81 to 0x83, followed by an 8 bit keycode.
  // In this mode, there seem to be no key-down codes
  // printf("%08x %08x %08x\n", keyCode, mods, key);
  maskedKeyCode = keyCode & 0x7f;
  mods_to_e_state( mods ); // process modifier keys
  if (!macKeyLookUp) macKeyLookUp = Fl_Darwin_System_Driver::compute_macKeyLookUp();
  sym = macKeyLookUp[maskedKeyCode];
  if (sym < 0xff00) { // a "simple" key
    // find the result of this key without modifier
    NSString *sim = [theEvent charactersIgnoringModifiers];
    UniChar one;
    CFStringGetCharacters((CFStringRef)sim, CFRangeMake(0, 1), &one);
    // charactersIgnoringModifiers doesn't ignore shift, remove it when it's on
    if(one >= 'A' && one <= 'Z') one += 32;
    if (one > 0 && one <= 0x7f && (sym<'0' || sym>'9') ) sym = one;
  }
  Fl::e_keysym = Fl::e_original_keysym = sym;
  /*NSLog(@"cocoaKeyboardHandler: keycode=%08x keysym=%08x mods=%08x symbol=%@ (%@)",
   keyCode, sym, mods, [theEvent characters], [theEvent charactersIgnoringModifiers]);*/
  // If there is text associated with this key, it will be filled in later.
  Fl::e_length = 0;
  Fl::e_text = (char*)"";
}

@interface FLTextInputContext : NSObject // "emulates" NSTextInputContext before OS 10.6
+ (void)initialize;
+ (FLTextInputContext*)singleInstance;
-(BOOL)handleEvent:(NSEvent*)theEvent;
@end
static FLTextInputContext* fltextinputcontext_instance = nil;
@implementation FLTextInputContext
+ (void)initialize {
  fltextinputcontext_instance = [[FLTextInputContext alloc] init];
}
+ (FLTextInputContext*)singleInstance {
  return fltextinputcontext_instance;
}
-(BOOL)handleEvent:(NSEvent*)theEvent {
  FLTextView *edit = [FLTextView singleInstance];
  [edit setActive:YES];
  [edit interpretKeyEvents:[NSArray arrayWithObject:theEvent]];
  [edit setActive:YES];
  return YES;
}
@end

/* Implementation note for the support of layer-backed views.
 MacOS 10.14 Mojave changes the way all drawing to displays is performed:
 all NSView objects become layer-backed, that is, drawing is done by
 Core Animation to a CALayer object whose content is then displayed by the NSView.
 The global variable views_use_CA is set to YES when such change applies,
 that is, for apps running under 10.14 and linked to SDK 10.14.
 When views_use_CA is NO, views are not supposed to be layer-backed.

 Most drawing is done by [FLView drawRect:] which the system calls
 when a window is created or resized and when Fl_Window_Driver::flush() runs which sends the display
 message to the view. Within drawRect:, [[NSGraphicsContext currentContext] CGContext]
 gives a graphics context whose product ultimately appears on screen. But the
 full content of the view must be redrawn each time drawRect: runs, in contrast
 to pre-10.14 where drawings were added to the previous window content.
 That is why FLView maintains a bitmap (view->aux_bitmap) to which all drawing is directed.
 At the end of drawRect:, the content of view->aux_bitmap is copied to the window's graphics context.

 A problem arises to support drawing done outside Fl_Window_Driver::flush(), that is,
 after the app calls Fl_Window::make_current() at any time it wants.
 That situation is identified by the condition (views_use_CA && !through_drawRect).
 Fl_Window::make_current() thus calls [view setNeedsDisplay:YES] which instructs the system to
 run drawRect: at the next event loop. Later, when drawRect: runs, the content of
 aux_bitmap is copied to drawRect's graphics context.

 OpenGL windows remain processed under 10.14 as before.
 */

@implementation FLView
- (BOOL)did_view_resolution_change {
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
  if (fl_mac_os_version >= 100700) { // determine whether window is mapped to a retina display
    Fl_Window *window = [(FLWindow*)[self window] getFl_Window];
    Fl_Cocoa_Window_Driver *d = Fl_Cocoa_Window_Driver::driver(window);
    bool previous = d->mapped_to_retina();
    NSView *view = (!views_use_CA && window->parent() && !window->as_gl_window()) ?
                      [fl_xid(window->top_window()) contentView] : self;
    if (view) {
      NSSize s = [view convertSizeToBacking:NSMakeSize(10, 10)]; // 10.7
      d->mapped_to_retina( int(s.width + 0.5) > 10 );
    }
    BOOL retval = (d->wait_for_expose_value == 0 && previous != d->mapped_to_retina());
    if (retval) {
      d->changed_resolution(true);
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
      if (views_use_CA && !window->as_gl_window() ) {
        [self reset_aux_bitmap];
        window->redraw();
      }
#endif
    }
    return retval;
  }
#endif
  return NO;
}
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
- (void)create_aux_bitmap:(CGContextRef)gc retina:(BOOL)r {
  if (!gc || fl_mac_os_version >= 101600) {
    // bitmap context-related functions (e.g., CGBitmapContextGetBytesPerRow) can't be used here with macOS 11.0 "Big Sur"
    static CGColorSpaceRef cspace = CGColorSpaceCreateDeviceRGB();
    int W = [self frame].size.width, H = [self frame].size.height;
    if (r) { W *= 2; H *= 2; }
    aux_bitmap = CGBitmapContextCreate(NULL, W, H, 8, 0, cspace, kCGImageAlphaPremultipliedFirst|kCGBitmapByteOrder32Host);
  } else {
    aux_bitmap = CGBitmapContextCreate(NULL, CGBitmapContextGetWidth(gc), CGBitmapContextGetHeight(gc),
                                       CGBitmapContextGetBitsPerComponent(gc), CGBitmapContextGetBytesPerRow(gc),
                                       CGBitmapContextGetColorSpace(gc), CGBitmapContextGetBitmapInfo(gc));
  }
  CGContextClearRect(aux_bitmap, CGRectMake(0, 0,
                     CGBitmapContextGetWidth(aux_bitmap), CGBitmapContextGetHeight(aux_bitmap)));
  if (r) CGContextScaleCTM(aux_bitmap, 2, 2);
}
- (void)reset_aux_bitmap {
  CGContextRelease(aux_bitmap);
  aux_bitmap = NULL;
}
#endif
- (BOOL)process_keydown:(NSEvent*)theEvent
{
  id o = fl_mac_os_version >= 100600 ? [self performSelector:@selector(inputContext)] : [FLTextInputContext singleInstance];
  return [o handleEvent:theEvent];
}
- (id)initWithFrame:(NSRect)frameRect
{
  static NSInteger counter = 0;
  self = [super initWithFrame:frameRect];
  if (self) {
    in_key_event = NO;
    identifier = ++counter;
    }
  return self;
}

/* Used by all GL or non-GL windows.
 * Gets called when a window is created, resized, or moved between retina and non-retina displays.
 * For non-GL windows, also called by Fl_Window_Driver::flush() because of the display message sent to the view.
 */
- (void)drawRect:(NSRect)rect
{
  FLWindow *cw = (FLWindow*)[self window];
  Fl_Window *window = [cw getFl_Window];
  if (!window) return; // may happen after closing full-screen window
  if (!Fl_X::flx(window)) return; // reported to happen with Gmsh (issue #434)
  fl_lock_function();
  Fl_Cocoa_Window_Driver *d = Fl_Cocoa_Window_Driver::driver(window);
  if (!through_Fl_X_flush
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
            && (!views_use_CA || !aux_bitmap)
#endif
      ) {
    [self did_view_resolution_change];
    if (d->wait_for_expose_value) {
      d->wait_for_expose_value = 0;
      if (window->as_gl_window() && views_use_CA && fl_mac_os_version < 101401) { // 1st drawing of layer-backed GL window
        window->size(window->w(), window->h()); // sends message [GLcontext update]
      }
    }
    Fl_X *i = Fl_X::flx(window);
    if ( i->region ) {
      Fl_Graphics_Driver::default_driver().XDestroyRegion(i->region);
      i->region = 0;
    }
    window->clear_damage(FL_DAMAGE_ALL);
  }
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
  CGContextRef destination = NULL;
  if (views_use_CA) {
    destination = [[NSGraphicsContext currentContext] CGContext];
    if (!aux_bitmap && !window->as_gl_window()) [self create_aux_bitmap:destination retina:d->mapped_to_retina()];
  }
#endif
  through_drawRect = YES;
  if (window->damage()) d->Fl_Window_Driver::flush();
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
  if (destination) { // can be NULL with gl_start/gl_finish
    if (fl_mac_os_version < 101600 && CGBitmapContextGetBytesPerRow(aux_bitmap) == CGBitmapContextGetBytesPerRow(destination)) {
      memcpy(CGBitmapContextGetData(destination), CGBitmapContextGetData(aux_bitmap),
             CGBitmapContextGetHeight(aux_bitmap) * CGBitmapContextGetBytesPerRow(aux_bitmap));
    } else {
      CGImageRef img = CGBitmapContextCreateImage(aux_bitmap);
      CGContextDrawImage(destination, [self frame], img);
      CGImageRelease(img);
    }
  }
#endif
  Fl_Cocoa_Window_Driver::q_release_context();
  if (!through_Fl_X_flush) window->clear_damage();
  through_drawRect = NO;
  fl_unlock_function();
}

- (BOOL)acceptsFirstResponder
{
  return [[self window] parentWindow] ? NO : YES; // 10.2
}
- (BOOL)performKeyEquivalent:(NSEvent*)theEvent
{
  //NSLog(@"performKeyEquivalent:");
  NSUInteger mods = [theEvent modifierFlags];
  NSString *pure = [theEvent charactersIgnoringModifiers];
  // detect Function+e to open character palette
  if ((mods & NSEventModifierFlagFunction) && [pure isEqualToString:@"e"] ) {
      [NSApp orderFrontCharacterPalette:self];
      return YES;
  }
  fl_lock_function();
  cocoaKeyboardHandler(theEvent);
  BOOL handled;
  Fl_Window *w = [(FLWindow*)[theEvent window] getFl_Window];
  if ( (mods & NSEventModifierFlagControl) || (mods & NSEventModifierFlagCommand) ) {
    NSString *s = [theEvent characters];
    if ( (mods & NSEventModifierFlagShift) && (mods & NSEventModifierFlagCommand) ) {
      s = [s uppercaseString]; // US keyboards return lowercase letter in s if cmd-shift-key is hit
      }
    [FLView prepareEtext:s];
    Fl::compose_state = 0;
    handled = Fl::handle(FL_KEYBOARD, w);
    if (!handled) {
      // detect Ctrl+Command+Space to open character palette, if not used before as shortcut
      if ( (mods & NSEventModifierFlagControl) && (mods & NSEventModifierFlagCommand) &&
        !(mods & (NSEventModifierFlagShift|NSEventModifierFlagOption)) && [pure isEqualToString:@" "] ) {
          [NSApp orderFrontCharacterPalette:self];
      }
    }
  }
  else {
    in_key_event = YES;
    need_handle = NO;
    handled = [self process_keydown:theEvent];
    if (need_handle) handled = Fl::handle(FL_KEYBOARD, w);
    in_key_event = NO;
    }
  fl_unlock_function();
  return handled;
}
- (BOOL)acceptsFirstMouse:(NSEvent*)theEvent
{
  Fl_Window *w = [(FLWindow*)[theEvent window] getFl_Window];
  Fl_Window *first = Fl::first_window();
  return (first == w || !first->modal());
}
- (void)resetCursorRects {
  Fl_Window *w = [(FLWindow*)[self window] getFl_Window];
  Fl_X *i = (w ? Fl_X::flx(w) : NULL);
  if (!i) return;  // fix for STR #3128
  // We have to have at least one cursor rect for invalidateCursorRectsForView
  // to work, hence the "else" clause.
  if (Fl_Cocoa_Window_Driver::driver(w)->cursor)
    [self addCursorRect:[self frame] cursor:Fl_Cocoa_Window_Driver::driver(w)->cursor];
  else
    [self addCursorRect:[self frame] cursor:[NSCursor arrowCursor]];
}
- (void)mouseUp:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)rightMouseUp:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)otherMouseUp:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)mouseDown:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)rightMouseDown:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)otherMouseDown:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)mouseMoved:(NSEvent *)theEvent {
  if (Fl::belowmouse()) cocoaMouseHandler(theEvent);
}
- (void)mouseEntered:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)mouseExited:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
- (void)updateTrackingAreas {
  if (fl_mac_os_version >= 100500) {
    if (![[self window] parentWindow]) {
      while (true) {
        NSArray *a = [self trackingAreas]; // 10.5
        if ([a count] == 0) break;
        NSTrackingArea *ta = (NSTrackingArea*)[a objectAtIndex:0];
        [self removeTrackingArea:ta]; // 10.5
      }
      NSTrackingArea *tracking = [[[NSTrackingArea alloc] // 10.5
                               initWithRect:[self frame]
                               options:NSTrackingActiveAlways |
                               NSTrackingMouseEnteredAndExited |
                               NSTrackingMouseMoved
                               owner:self
                               userInfo:nil] autorelease];
      if (tracking) {
        [self addTrackingArea:tracking]; // 10.5
      }
    }
    [super updateTrackingAreas];
  }
}
#endif
- (void)mouseDragged:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)rightMouseDragged:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)otherMouseDragged:(NSEvent *)theEvent {
  cocoaMouseHandler(theEvent);
}
- (void)scrollWheel:(NSEvent *)theEvent {
  cocoaMouseWheelHandler(theEvent);
}
- (void)magnifyWithEvent:(NSEvent *)theEvent {
  cocoaMagnifyHandler(theEvent);
}
- (void)keyDown:(NSEvent *)theEvent {
  //NSLog(@"keyDown:%@",[theEvent characters]);
  fl_lock_function();
  Fl_Window *window = [(FLWindow*)[theEvent window] getFl_Window];
  Fl::first_window(window);
  cocoaKeyboardHandler(theEvent);
  in_key_event = YES;
  Fl_Widget *f = Fl::focus();
  if (f && f->as_gl_window()) { // ignore text input methods for GL windows
    need_handle = YES;
    [FLView prepareEtext:[theEvent characters]];
  } else {
    need_handle = NO;
    [self process_keydown:theEvent];
  }
  if (need_handle) Fl::handle(FL_KEYBOARD, window);
  in_key_event = NO;
  fl_unlock_function();
}
- (void)keyUp:(NSEvent *)theEvent {
  //NSLog(@"keyUp:%@",[theEvent characters]);
  if (![[theEvent window] isKindOfClass:[FLWindow class]]) // issue #1170
    return [super keyUp:theEvent];
  fl_lock_function();
  Fl_Window *window = (Fl_Window*)[(FLWindow*)[theEvent window] getFl_Window];
  Fl::first_window(window);
  cocoaKeyboardHandler(theEvent);
  NSString *s = [theEvent characters];
  if ([s length] >= 1) [FLView prepareEtext:[s substringToIndex:1]];
  Fl::handle(FL_KEYUP,window);
  fl_unlock_function();
}
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_10
  typedef NSUInteger NSEventModifierFlags;
#endif
- (void)flagsChanged:(NSEvent *)theEvent {
  //NSLog(@"flagsChanged: ");
  fl_lock_function();
  static NSEventModifierFlags prevMods = 0;
  NSEventModifierFlags mods = [theEvent modifierFlags];
  Fl_Window *window = (Fl_Window*)[(FLWindow*)[theEvent window] getFl_Window];
  NSEventModifierFlags tMods = prevMods ^ mods;
  int sendEvent = 0;
  if ( tMods )
  {
    unsigned short keycode = [theEvent keyCode];
    if (!macKeyLookUp) macKeyLookUp = Fl_Darwin_System_Driver::compute_macKeyLookUp();
    Fl::e_keysym = Fl::e_original_keysym = macKeyLookUp[keycode & 0x7f];
    if ( Fl::e_keysym )
      sendEvent = ( prevMods<mods ) ? FL_KEYBOARD : FL_KEYUP;
    Fl::e_length = 0;
    Fl::e_text = (char*)"";
    prevMods = mods;
  }
  mods_to_e_state( mods );
  if (sendEvent) Fl::handle(sendEvent,window);
  fl_unlock_function();
}
- (NSDragOperation)draggingEntered:(id < NSDraggingInfo >)sender
{
  fl_lock_function();
  Fl_Window *target = [(FLWindow*)[self window] getFl_Window];
  update_e_xy_and_e_xy_root([self window]);
  fl_dnd_target_window = target;
  int ret = Fl::handle( FL_DND_ENTER, target );
  Fl_Cocoa_Screen_Driver::breakMacEventLoop();
  fl_unlock_function();
  Fl::flush();
  return ret ? NSDragOperationCopy : NSDragOperationNone;
}
- (NSDragOperation)draggingUpdated:(id < NSDraggingInfo >)sender
{
  fl_lock_function();
  Fl_Window *target = [(FLWindow*)[self window] getFl_Window];
  update_e_xy_and_e_xy_root([self window]);
  fl_dnd_target_window = target;
  int ret = Fl::handle( FL_DND_DRAG, target );
  Fl_Cocoa_Screen_Driver::breakMacEventLoop();
  fl_unlock_function();
  // if the DND started in the same application, Fl::dnd() will not return until
  // the DND operation is finished. The call below causes the drop indicator
  // to be drawn correctly (a full event handling would be better...)
  Fl::flush();
  return ret ? NSDragOperationCopy : NSDragOperationNone;
}
- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
  static char *DragData = NULL;
  fl_lock_function();
  Fl_Window *target = [(FLWindow*)[self window] getFl_Window];
  if ( !Fl::handle( FL_DND_RELEASE, target ) ) {
    Fl_Cocoa_Screen_Driver::breakMacEventLoop();
    fl_unlock_function();
    return NO;
  }
  NSPasteboard *pboard;
  // NSDragOperation sourceDragMask;
  // sourceDragMask = [sender draggingSourceOperationMask];
  pboard = [sender draggingPasteboard];
  update_e_xy_and_e_xy_root([self window]);
  if (DragData) { free(DragData); DragData = NULL; }
  if ([[pboard types] containsObject:fl_filenames_pboard_type]) {
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_13
    if (fl_mac_os_version >= 101300) {
      NSArray *a = [pboard readObjectsForClasses:[NSArray arrayWithObject:[NSURL class]]
                                         options:nil]; // 10.6
      NSEnumerator *enumerator = [a objectEnumerator];
      NSURL *url;
      while ((url = (NSURL*)[enumerator nextObject]) != nil) {
        const char *p = [url fileSystemRepresentation]; // 10.9
        if (!DragData) {
          DragData = strdup(p);
        } else {
          int l = (int)strlen(DragData) + (int)strlen(p) + 2;
          char *drag2 = (char*)malloc(l);
          snprintf(drag2, l, "%s\n%s", DragData, p);
          free(DragData);
          DragData = drag2;
        }
      }
    } else
#endif
    {
      CFArrayRef files = (CFArrayRef)[pboard
                                      propertyListForType:fl_filenames_pboard_type];
      CFStringRef all = CFStringCreateByCombiningStrings(NULL, files, CFSTR("\n"));
      int l = (int)CFStringGetMaximumSizeForEncoding(CFStringGetLength(all),
                                                     kCFStringEncodingUTF8);
      DragData = (char *)malloc(l + 1);
      CFStringGetCString(all, DragData, l + 1, kCFStringEncodingUTF8);
      CFRelease(all);
    }
  } else if ([[pboard types] containsObject:UTF8_pasteboard_type]) {
    NSData *data = [pboard dataForType:UTF8_pasteboard_type];
    DragData = (char *)malloc([data length] + 1);
    [data getBytes:DragData length:[data length]];
    DragData[([data length])] = 0;
    Fl_Screen_Driver::convert_crlf(DragData, strlen(DragData));
  }
  else {
    Fl_Cocoa_Screen_Driver::breakMacEventLoop();
    fl_unlock_function();
    return NO;
  }
  Fl::e_text = DragData;
  Fl::e_length = (int)strlen(DragData);
  int old_event = Fl::e_number;
  Fl::belowmouse()->handle(Fl::e_number = FL_PASTE);
  Fl::e_number = old_event;
  if (DragData) { free(DragData); DragData = NULL; }
  Fl::e_text = NULL;
  Fl::e_length = 0;
  fl_dnd_target_window = NULL;
  Fl_Cocoa_Screen_Driver::breakMacEventLoop();
  fl_unlock_function();
  return YES;
}
- (void)draggingExited:(id < NSDraggingInfo >)sender
{
  fl_lock_function();
  if ( fl_dnd_target_window ) {
    Fl::handle( FL_DND_LEAVE, fl_dnd_target_window );
    fl_dnd_target_window = 0;
  }
  fl_unlock_function();
}
- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal
{
  return NSDragOperationGeneric;
}

+ (void)prepareEtext:(NSString*)aString {
  // fills Fl::e_text with UTF-8 encoded aString using an adequate memory allocation
  static char *received_utf8 = NULL;
  static int lreceived = 0;
  char *p = (char*)[aString UTF8String];
  int l = (int)strlen(p);
  if (l > 0) {
    if (lreceived == 0) {
      received_utf8 = (char*)malloc(l + 1);
      lreceived = l;
    }
    else if (l > lreceived) {
      received_utf8 = (char*)realloc(received_utf8, l + 1);
      lreceived = l;
    }
    strcpy(received_utf8, p);
    Fl::e_text = received_utf8;
  }
  Fl::e_length = l;
}

+ (void)concatEtext:(NSString*)aString {
  // extends Fl::e_text with aString
  NSString *newstring = [[NSString stringWithUTF8String:Fl::e_text] stringByAppendingString:aString];
  [FLView prepareEtext:newstring];
}

- (void)doCommandBySelector:(SEL)aSelector {
  NSString *s = [[NSApp currentEvent] characters];
  //NSLog(@"doCommandBySelector:%s text='%@'",sel_getName(aSelector), s);
  s = [s substringFromIndex:[s length] - 1];
  [FLView prepareEtext:s]; // use the last character of the event; necessary for deadkey + Tab
  Fl_Window *target = [(FLWindow*)[self window] getFl_Window];
  Fl::handle(FL_KEYBOARD, target);
}

- (void)insertText:(id)aString {
  [self insertText:aString replacementRange:NSMakeRange(NSNotFound, 0)];
}

- (void)insertText:(id)aString replacementRange:(NSRange)replacementRange {
  NSString *received;
  if ([aString isKindOfClass:[NSAttributedString class]]) {
    received = [(NSAttributedString*)aString string];
  } else {
    received = (NSString*)aString;
  }
  /*NSLog(@"insertText='%@' l=%d Fl::compose_state=%d range=%d,%d",
        received,strlen([received UTF8String]),Fl::compose_state,replacementRange.location,replacementRange.length);*/
  fl_lock_function();
  Fl_Window *target = [(FLWindow*)[self window] getFl_Window];
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
  if (fl_mac_os_version >= 101400 && replacementRange.length > 0) {
    // occurs after a key was pressed and maintained and an auxiliary window appeared
    // prevents marking dead key from deactivation
    [[self inputContext] discardMarkedText];
  }
#endif
  while (replacementRange.length--) { // delete replacementRange.length characters before insertion point
    int saved_keysym = Fl::e_keysym;
    Fl::e_keysym = FL_BackSpace;
    Fl::handle(FL_KEYBOARD, target);
    Fl::e_keysym = saved_keysym;
    }
  if (in_key_event && Fl_Cocoa_Screen_Driver::next_marked_length && Fl::e_length) {
    // if setMarkedText + insertText is sent during handleEvent, text cannot be concatenated in single FL_KEYBOARD event
    Fl::handle(FL_KEYBOARD, target);
    Fl::e_length = 0;
    }
  if (in_key_event && Fl::e_length) [FLView concatEtext:received];
  else [FLView prepareEtext:received];
  Fl_Cocoa_Screen_Driver::next_marked_length = 0;
  // We can get called outside of key events (e.g., from the character palette, from CJK text input).
  BOOL palette = !(in_key_event || Fl::compose_state);
  if (palette) Fl::e_keysym = 0;
  // YES if key has text attached
  BOOL has_text_key = Fl::e_keysym <= '~' || Fl::e_keysym == FL_Iso_Key ||
                      (Fl::e_keysym >= FL_KP && Fl::e_keysym <= FL_KP_Last && Fl::e_keysym != FL_KP_Enter);
  // insertText sent during handleEvent of a key without text cannot be processed in a single FL_KEYBOARD event.
  // Occurs with deadkey followed by non-text key
  if (!in_key_event || !has_text_key) {
    Fl::handle(FL_KEYBOARD, target);
    Fl::e_length = 0;
    }
  else need_handle = YES;
  selectedRange = NSMakeRange(100, 0); // 100 is an arbitrary value
  // for some reason, with the palette, the window does not redraw until the next mouse move or button push
  // sending a 'redraw()' or 'awake()' does not solve the issue!
  if (palette) Fl::flush();
  if (fl_mac_os_version < 100600) [[FLTextView singleInstance] setActive:NO];
  fl_unlock_function();
}

- (void)setMarkedText:(id)aString selectedRange:(NSRange)newSelection  {
  [self setMarkedText:aString selectedRange:newSelection replacementRange:NSMakeRange(NSNotFound, 0)];
}

- (void)setMarkedText:(id)aString selectedRange:(NSRange)newSelection replacementRange:(NSRange)replacementRange {
  NSString *received;
  if ([aString isKindOfClass:[NSAttributedString class]]) {
    received = [(NSAttributedString*)aString string];
  } else {
    received = (NSString*)aString;
  }
  fl_lock_function();
  /*NSLog(@"setMarkedText:%@ l=%d newSelection=%d,%d Fl::compose_state=%d replacement=%d,%d",
        received, strlen([received UTF8String]), newSelection.location, newSelection.length, Fl::compose_state,
        replacementRange.location, replacementRange.length);*/
  Fl_Window *target = [(FLWindow*)[self window] getFl_Window];
  while (replacementRange.length--) { // delete replacementRange.length characters before insertion point
    Fl::e_keysym = FL_BackSpace;
    Fl::compose_state = 0;
    Fl_Cocoa_Screen_Driver::next_marked_length = 0;
    Fl::handle(FL_KEYBOARD, target);
    Fl::e_keysym = 'a'; // pretend a letter key was hit
  }
  if (in_key_event && Fl_Cocoa_Screen_Driver::next_marked_length && Fl::e_length) {
    // if setMarkedText + setMarkedText is sent during handleEvent, text cannot be concatenated in single FL_KEYBOARD event
    Fl::handle(FL_KEYBOARD, target);
    Fl::e_length = 0;
  }
  if (in_key_event && Fl::e_length) [FLView concatEtext:received];
  else [FLView prepareEtext:received];
  Fl_Cocoa_Screen_Driver::next_marked_length = (int)strlen([received UTF8String]);
  if (!in_key_event) Fl::handle( FL_KEYBOARD, target);
  else need_handle = YES;
  selectedRange = NSMakeRange(100, newSelection.length);
  fl_unlock_function();
}

- (void)unmarkText {
  fl_lock_function();
  Fl_Cocoa_Screen_Driver::reset_marked_text();
  fl_unlock_function();
  //NSLog(@"unmarkText");
}

- (NSRange)selectedRange {
  Fl_Widget *w = Fl::focus();
  if (w && w->use_accents_menu()) return selectedRange;
  return NSMakeRange(NSNotFound, 0);
}

- (NSRange)markedRange {
  //NSLog(@"markedRange=%d %d", Fl::compose_state > 0?0:NSNotFound, Fl::compose_state);
  return NSMakeRange(Fl::compose_state > 0?0:NSNotFound, Fl::compose_state);
}

- (BOOL)hasMarkedText {
  //NSLog(@"hasMarkedText %s", Fl::compose_state > 0?"YES":"NO");
  return (Fl::compose_state > 0);
}

- (NSAttributedString *)attributedSubstringFromRange:(NSRange)aRange {
  return [self attributedSubstringForProposedRange:aRange actualRange:NULL];
}
- (NSAttributedString *)attributedSubstringForProposedRange:(NSRange)aRange actualRange:(NSRangePointer)actualRange {
  //NSLog(@"attributedSubstringFromRange: %d %d",aRange.location,aRange.length);
  return nil;
}

- (NSArray *)validAttributesForMarkedText {
  return nil;
}

- (NSRect)firstRectForCharacterRange:(NSRange)aRange {
  return [self firstRectForCharacterRange:aRange actualRange:NULL];
}
- (NSRect)firstRectForCharacterRange:(NSRange)aRange actualRange:(NSRangePointer)actualRange {
  //NSLog(@"firstRectForCharacterRange %d %d actualRange=%p",aRange.location, aRange.length,actualRange);
  NSRect glyphRect;
  fl_lock_function();
  Fl_Widget *focus = Fl::focus();
  Fl_Window *wfocus = [(FLWindow*)[self window] getFl_Window];
  if (!focus) focus = wfocus;
  glyphRect.size.width = 0;

  int x, y, height;
  if (Fl_Cocoa_Screen_Driver::insertion_point_location(&x, &y, &height)) {
    glyphRect.origin.x = (CGFloat)x;
    glyphRect.origin.y = (CGFloat)y;
  } else {
    if (focus->as_window()) {
      glyphRect.origin.x = 0;
      glyphRect.origin.y = focus->h();
      }
    else {
      glyphRect.origin.x = focus->x();
      glyphRect.origin.y = focus->y() + focus->h();
      }
    height = 12;
  }
  glyphRect.size.height = height;
  Fl_Window *win = focus->as_window();
  if (!win) win = focus->window();
  while (win != NULL && win != wfocus) {
    glyphRect.origin.x += win->x();
    glyphRect.origin.y += win->y();
    win = win->window();
  }
  // Convert the rect to screen coordinates
  float s = Fl_Graphics_Driver::default_driver().scale();
  glyphRect.origin.x *= s;
  glyphRect.origin.y *= s;
  glyphRect.origin.y = wfocus->h()*s - glyphRect.origin.y;
  glyphRect.origin = [(FLWindow*)[self window] convertBaseToScreen:glyphRect.origin];
  glyphRect.size.height *= s;
  if (actualRange) *actualRange = aRange;
  fl_unlock_function();
  return glyphRect;
}

- (NSUInteger)characterIndexForPoint:(NSPoint)aPoint {
  return 0;
}

- (NSInteger)windowLevel {
  return [[self window] level];
}

- (
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
   NSInteger
#else
   long
#endif
)conversationIdentifier {
  return identifier;
}

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
- (NSDragOperation)draggingSession:(NSDraggingSession *)session sourceOperationMaskForDraggingContext:(NSDraggingContext)context
{
  return NSDragOperationCopy;
}
- (void)draggingSession:(NSDraggingSession *)session
           endedAtPoint:(NSPoint)screenPoint operation:(NSDragOperation)operation
{
  Fl_Widget *w = Fl::pushed();
  if ( w ) {
    int old_event = Fl::e_number;
    w->handle(Fl::e_number = FL_RELEASE);
    Fl::e_number = old_event;
    Fl::pushed( 0 );
  }
}
#endif

@end


/*
 * Initialize the given port for redraw and call the window's flush() to actually draw the content
 */
void Fl_Cocoa_Window_Driver::flush()
{
  if (pWindow->as_gl_window()) {
    Fl_Window_Driver::flush();
  } else {
    through_Fl_X_flush = YES;
    NSView *view = [fl_xid(pWindow) contentView];
    if (views_use_CA) [view display];
    else {
      [view setNeedsDisplay:YES];
      [view displayIfNeededIgnoringOpacity];
    }
    through_Fl_X_flush = NO;
  }
}

/*
 * go ahead, create that (sub)window
 */
void Fl_Cocoa_Window_Driver::makeWindow()
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  Fl_Group::current(0);
  fl_open_display();
  NSInteger winlevel = NSNormalWindowLevel;
  NSUInteger winstyle;
  Fl_Sys_Menu_Bar::create_window_menu(); // effective once at most
  Fl_Window* w = pWindow;
  if (w->parent()) {
    w->border(0);
    show_iconic(0);
  }
  if (w->border()) {
    winstyle = (NSWindowStyleMaskTitled | NSWindowStyleMaskClosable |
                NSWindowStyleMaskMiniaturizable);
    if (is_resizable())
      winstyle |= NSWindowStyleMaskResizable;
  } else {
    winstyle = NSWindowStyleMaskBorderless;
  }
  if (show_iconic() && !w->parent()) { // prevent window from being out of work area when created iconized
    int sx, sy, sw, sh;
    Fl::screen_work_area (sx, sy, sw, sh, w->x(), w->y());
    if (w->x() < sx) x(sx);
    if (w->y() < sy) y(sy);
  }
  int xp = w->x();
  int yp = w->y();

  int xwm = xp, ywm = yp, bt, bx, by;

  if (!fake_X_wm(w, xwm, ywm, bt, bx, by)) {
    // menu windows and tooltips
    if (w->modal()||w->tooltip_window()) {
      winlevel = modal_window_level();
    }
  }
  if (w->modal()) {
    winstyle &= ~NSWindowStyleMaskMiniaturizable;
    winlevel = modal_window_level();
  }
  else if (w->non_modal()) {
    winlevel = non_modal_window_level();
  }

  if (force_position()) {
    if (!Fl::grab()) {
      xp = xwm; yp = ywm;
      x(xp);y(yp);
    }
    xp -= bx;
    yp -= by+bt;
  }

  Fl_X *x = new Fl_X;
  other_xid = 0; // room for doublebuffering image map. On OS X this is only used by overlay windows
  x->region = 0;
  subRect(0);
  gc = 0;
  mapped_to_retina(false);
  changed_resolution(false);

  NSRect crect;
  if (w->fullscreen_active() && fl_mac_os_version < 100700) {
    int top, bottom, left, right;
    int sx, sy, sw, sh, X, Y, W, H;

    top = fullscreen_screen_top();
    bottom = fullscreen_screen_bottom();
    left = fullscreen_screen_left();
    right = fullscreen_screen_right();

    if ((top < 0) || (bottom < 0) || (left < 0) || (right < 0)) {
      top = Fl::screen_num(w->x(), w->y(), w->w(), w->h());
      bottom = top;
      left = top;
      right = top;
    }

    Fl::screen_xywh(sx, sy, sw, sh, top);
    Y = sy;
    Fl::screen_xywh(sx, sy, sw, sh, bottom);
    H = sy + sh - Y;
    Fl::screen_xywh(sx, sy, sw, sh, left);
    X = sx;
    Fl::screen_xywh(sx, sy, sw, sh, right);
    W = sx + sw - X;

    w->resize(X, Y, W, H);

    winstyle = NSWindowStyleMaskBorderless;
    winlevel = NSStatusWindowLevel;
  }
  float s = Fl::screen_driver()->scale(0);
  crect.origin.x = round(s * w->x()); // correct origin set later for subwindows
  crect.origin.y = main_screen_height - round(s * (w->y() + w->h()));
  crect.size.width = int(s * w->w());
  crect.size.height = int(s * w->h());
  FLWindow *cw = [[FLWindow alloc] initWithFl_W:w
                                    contentRect:crect
                                      styleMask:winstyle];
  [cw setFrameOrigin:crect.origin];
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_12
  if (fl_mac_os_version >= 101200) {
    if (!w->parent() && (winstyle & NSWindowStyleMaskTitled) &&
        (winstyle & NSWindowStyleMaskResizable) && !w->modal() && !w->non_modal() &&
        (Fl_MacOS_Sys_Menu_Bar_Driver::window_menu_style() > Fl_Sys_Menu_Bar::tabbing_mode_none)) {
      if (Fl_MacOS_Sys_Menu_Bar_Driver::window_menu_style() == Fl_Sys_Menu_Bar::tabbing_mode_preferred)
        [cw setTabbingMode:NSWindowTabbingModePreferred];
      else [cw setTabbingMode:NSWindowTabbingModeAutomatic];
    } else {
      [cw setTabbingMode:NSWindowTabbingModeDisallowed];
    }
  }
#endif
  if (!w->parent()) {
    [cw setHasShadow:YES];
    [cw setAcceptsMouseMovedEvents:YES];
  }
  if (w->shape()) {
    [cw setOpaque:NO]; // shaped windows must be non opaque
    [cw setBackgroundColor:[NSColor clearColor]]; // and with transparent background color
  }
  x->xid = (fl_uintptr_t)cw;
  x->w = w;
  flx(x);
  wait_for_expose_value = 1;
  if (!w->parent()) {
    x->next = Fl_X::first;
    Fl_X::first = x;
  } else if (Fl_X::first) {
    x->next = Fl_X::first->next;
    Fl_X::first->next = x;
  }
  else {
    x->next = NULL;
    Fl_X::first = x;
  }
  FLView *myview = [[FLView alloc] initWithFrame:crect];
  [cw setContentView:myview];
  [myview release];
  [cw setLevel:winlevel];

  q_set_window_title(cw, w->label(), w->iconlabel());
  NSImage *icon = icon_image; // is a window or default icon present?
  if (!icon) icon = ((Fl_Cocoa_Screen_Driver*)Fl::screen_driver())->default_icon;
  if (icon && (winstyle & NSWindowStyleMaskTitled) && w->label() && strlen(w->label()) > 0) {
    [cw setRepresentedFilename:[NSString stringWithFormat:@"/%@", [cw title]]];
    NSButton *icon_button = [cw standardWindowButton:NSWindowDocumentIconButton];
    if (icon_button) {
      [icon setSize:[icon_button frame].size];
      [icon_button setImage:icon];
    }
  }
  if (!force_position()) {
    if (w->modal()) {
      [cw center];
    } else if (w->non_modal()) {
      [cw center];
    } else if (!w->fullscreen_active()) {
      static NSPoint delta = NSZeroPoint;
      delta = [cw cascadeTopLeftFromPoint:delta];
    }
    crect = [cw frame]; // synchronize FLTK's and the system's window coordinates
    this->x(round(crect.origin.x/s));
    this->y( round((main_screen_height - crect.origin.y)/s) - w->h() );
  }
  // Install DnD handlers
  [myview registerForDraggedTypes:[NSArray arrayWithObjects:UTF8_pasteboard_type,
                                   fl_filenames_pboard_type, nil]];

  if (pWindow->get_size_range(NULL, NULL, NULL, NULL, NULL, NULL, NULL)) size_range();

  if ( w->border() || (!w->modal() && !w->tooltip_window()) ) {
    Fl_Tooltip::enter(0);
  }

  if (w->modal()) Fl::modal_ = w;

  w->set_visible();
  if ( w->border() || (!w->modal() && !w->tooltip_window() &&
                       w->user_data() != &Fl_Screen_Driver::transient_scale_display) ) Fl::handle(FL_FOCUS, w);
  [cw setDelegate:[FLWindowDelegate singleInstance]];
  if (show_iconic()) {
    show_iconic(0);
    w->handle(FL_SHOW); // create subwindows if any
    if (fl_mac_os_version < 101300) { // TODO: threshold may be smaller
      // draw the window and its subwindows before its icon is computed
      [cw recursivelySendToSubwindows:@selector(display) applyToSelf:YES];
    }
    [cw miniaturize:nil];
  } else if (w->parent()) { // a subwindow
    [cw setIgnoresMouseEvents:YES]; // needs OS X 10.2
    // next 2 statements so a subwindow doesn't leak out of its parent window
    [cw setOpaque:NO];
    [cw setBackgroundColor:[NSColor clearColor]]; // transparent background color
    starting_moved_window = w;
    [cw setSubwindowFrame];
    starting_moved_window = NULL;
    // needed if top window was first displayed miniaturized
    FLWindow *pxid = fl_xid(w->top_window());
    [pxid makeFirstResponder:[pxid contentView]];
  } else { // a top-level window
    if ([cw canBecomeKeyWindow]) [cw makeKeyAndOrderFront:nil];
    else [cw orderFront:nil];
    if (w->fullscreen_active() && fl_mac_os_version >= 100700) {
      if (fullscreen_screen_top() >= 0)  {
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_12
        if (fl_mac_os_version >= 101200)
          cw.collectionBehavior |= NSWindowCollectionBehaviorFullScreenNone;
#endif
        *no_fullscreen_x() = pWindow->x();
        *no_fullscreen_y() = pWindow->y();
      }
      fullscreen_on();
    }
  }
  if (fl_sys_menu_bar && Fl_MacOS_Sys_Menu_Bar_Driver::window_menu_style() && !w->parent() && w->border() &&
      !w->modal() && !w->non_modal()) {
    Fl_MacOS_Sys_Menu_Bar_Driver::driver()->new_window(w);
  }
  int old_event = Fl::e_number;
  w->handle(Fl::e_number = FL_SHOW);
  Fl::e_number = old_event;

  // if (w->modal()) { Fl::modal_ = w; fl_fix_focus(); }
  if (!w->parent()) [myview did_view_resolution_change]; // to set mapped_to_retina to its current state
  [pool release];
}


#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
static BOOL fullscreen_screen_border = NO; // YES means the multi-screened window had a border before
#endif


static NSUInteger calc_win_style(Fl_Window *win);


void Fl_Cocoa_Window_Driver::fullscreen_on() {
  pWindow->_set_fullscreen();
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
#  if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
  bool has_border = pWindow->border();
  if (fl_mac_os_version >= 100700 && fullscreen_screen_top() >= 0 && has_border) {
    fullscreen_screen_border = YES;
    has_border = false;
  }
  if (fl_mac_os_version >= 100700 && has_border) {
    NSWindow *nswin = fl_xid(pWindow);
#    if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_13
    if (fl_mac_os_version >= 101300) {
      NSWindow *active_tab = [[nswin tabGroup] selectedWindow];
      if (active_tab) nswin = active_tab;
    }
#    endif
    if (fullscreen_screen_border) { // from "All Screens" fullscreen to single-screen fullscreen
      pWindow->_clear_fullscreen();
      [nswin setLevel:NSNormalWindowLevel];
      [nswin setStyleMask:calc_win_style(pWindow)]; //10.6
      pWindow->_set_fullscreen();
    }
    [nswin toggleFullScreen:nil];
  } else
#  endif
    if (fl_mac_os_version >= 100600) {
    FLWindow *nswin = fl_xid(pWindow);
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
    if (fl_mac_os_version >= 100700 && (nswin.styleMask & NSWindowStyleMaskFullScreen)) {
      // from single-screen fullscreen to "All Screens" fullscreen, with border
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_12
      if (fl_mac_os_version >= 101200) {
        bool allscreens_on = (nswin.collectionBehavior & NSWindowCollectionBehaviorFullScreenNone);
        if (allscreens_on) nswin.collectionBehavior &= ~NSWindowCollectionBehaviorFullScreenNone;
        [nswin toggleFullScreen:nil];
        if (allscreens_on) nswin.collectionBehavior |= NSWindowCollectionBehaviorFullScreenNone;
      } else
#endif
      [nswin toggleFullScreen:nil];
      if (*no_fullscreen_w() == 0) {
        *no_fullscreen_x() = x();
        *no_fullscreen_y() = y();
        *no_fullscreen_w() = w();
        *no_fullscreen_h() = h();
      }
      pWindow->_set_fullscreen();
    }
#endif
    [nswin setStyleMask:NSWindowStyleMaskBorderless]; // 10.6
    if ([nswin isKeyWindow]) {
      if ([nswin level] != NSStatusWindowLevel) {
        [nswin setLevel:NSStatusWindowLevel];
        fixup_window_levels();
      }
    } else if([nswin level] != NSNormalWindowLevel) {
      [nswin setLevel:NSNormalWindowLevel];
      fixup_window_levels();
    }
    int sx, sy, sw, sh, X, Y, W, H;
    int top = fullscreen_screen_top();
    int bottom = fullscreen_screen_bottom();
    int left = fullscreen_screen_left();
    int right = fullscreen_screen_right();
    if ((top < 0) || (bottom < 0) || (left < 0) || (right < 0)) {
      top = Fl::screen_num(x(), y(), w(), h());
      bottom = top;
      left = top;
      right = top;
    }
    Fl::screen_xywh(sx, sy, sw, sh, top);
    Y = sy;
    Fl::screen_xywh(sx, sy, sw, sh, bottom);
    H = sy + sh - Y;
    Fl::screen_xywh(sx, sy, sw, sh, left);
    X = sx;
    Fl::screen_xywh(sx, sy, sw, sh, right);
    W = sx + sw - X;
    pWindow->resize(X, Y, W, H);
  } else
#endif
  { // On OS X < 10.6, it is necessary to recreate the window. This is done with hide+show.
    pWindow->hide();
    pWindow->show();
  }
  Fl::handle(FL_FULLSCREEN, pWindow);
}


void Fl_Cocoa_Window_Driver::maximize() {
  if (border()) [fl_xid(pWindow) performZoom:nil];
  else Fl_Window_Driver::maximize();
}


void Fl_Cocoa_Window_Driver::un_maximize() {
  if (border()) [fl_xid(pWindow) performZoom:nil];
  else Fl_Window_Driver::un_maximize();
}


#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
static NSUInteger calc_win_style(Fl_Window *win) {
  NSUInteger winstyle;
  if (win->border() && !win->fullscreen_active()) {
    winstyle = NSWindowStyleMaskTitled | NSWindowStyleMaskClosable;
    if (Fl_Window_Driver::driver(win)->is_resizable()) winstyle |= NSWindowStyleMaskResizable;
    if (!win->modal()) winstyle |= NSWindowStyleMaskMiniaturizable;
  } else winstyle = NSWindowStyleMaskBorderless;
  return winstyle;
}

static void restore_window_title_and_icon(Fl_Window *pWindow, NSImage *icon) {
  FLWindow *nswin = fl_xid(pWindow);
  q_set_window_title(nswin, pWindow->label(), pWindow->iconlabel());
  if (!icon) icon = ((Fl_Cocoa_Screen_Driver*)Fl::screen_driver())->default_icon;
  if (icon && ([nswin styleMask] & NSWindowStyleMaskTitled) && pWindow->label() &&
      (strlen(pWindow->label()) > 0)) {
    NSButton *icon_button = [nswin standardWindowButton:NSWindowDocumentIconButton];
    if (icon_button) {
      [icon setSize:[icon_button frame].size];
      [icon_button setImage:icon];
    }
  }
}
#endif

void Fl_Cocoa_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
  NSWindow *nswin = fl_xid(pWindow);
  pWindow->_clear_fullscreen();
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
#  if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
  if (fl_mac_os_version >= 100700 && ([nswin styleMask] & NSWindowStyleMaskFullScreen)) {
#    if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_13
    if (fl_mac_os_version >= 101300) {
      NSWindow *active_tab = [[nswin tabGroup] selectedWindow];
      if (active_tab) nswin = active_tab;
    }
#    endif
    [nswin toggleFullScreen:nil];
    pWindow->resize(*no_fullscreen_x(), *no_fullscreen_y(), *no_fullscreen_w(), *no_fullscreen_h());
  } else
#  endif
    if (fl_mac_os_version >= 100600) {
    // Transition from multi-screen fullscreen mode to normal mode
    NSInteger level = NSNormalWindowLevel;
    if (pWindow->modal()) level = modal_window_level();
    else if (pWindow->non_modal()) level = non_modal_window_level();
    /* Hide (orderOut) and later show (orderFront) the window to avoid a crash that
     occurs in a very specific situation: the dock is at bottom and
     H is larger than the maximum value for the display.
     See "Crashing regression in MacOS code" in fltk.coredev.
     */
    BOOL has_focus = [nswin isKeyWindow];
    [nswin orderOut:nil];
    [nswin setLevel:level];
    [nswin setStyleMask:calc_win_style(pWindow)]; //10.6
    restore_window_title_and_icon(pWindow, icon_image);
    pWindow->resize(X, Y, W, H);
    if (pWindow->maximize_active()) Fl_Window_Driver::maximize();
    if (has_focus) [nswin makeKeyAndOrderFront:nil];
    else [nswin orderFront:nil];
  } else
#endif
  {
    pWindow->hide();
    pWindow->resize(X, Y, W, H);
    pWindow->show();
  }
  Fl::handle(FL_FULLSCREEN, pWindow);
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
  fullscreen_screen_border = NO;
#endif
}


void Fl_Cocoa_Window_Driver::fullscreen_screens(bool on_off) {
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_12
  if (fl_mac_os_version >= 101200) {
    FLWindow *xid = fl_mac_xid(pWindow);
    if (on_off) xid.collectionBehavior |= NSWindowCollectionBehaviorFullScreenNone;
    else xid.collectionBehavior &= ~NSWindowCollectionBehaviorFullScreenNone;
  }
#endif
}


void Fl_Cocoa_Window_Driver::use_border() {
  if (!shown() || pWindow->parent()) return;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
  if (fl_mac_os_version >= 100600) {
    if (pWindow->fullscreen_active() || pWindow->maximize_active()) {
      // prevent changing border while window is fullscreen or maximized
      static bool active = false;
      if (!active) {
        active = true;
        bool b = !border();
        pWindow->border(b);
        active = false;
      }
      return;
    }
    [fl_xid(pWindow) setStyleMask:calc_win_style(pWindow)]; // 10.6
    if (border()) restore_window_title_and_icon(pWindow, icon_image);
    pWindow->redraw();
  }
  else
#endif
    Fl_Window_Driver::use_border();
}

/*
 * Tell the OS what window sizes we want to allow
 */
void Fl_Cocoa_Window_Driver::size_range() {
  Fl_X *i = Fl_X::flx(pWindow);
  if (i && i->xid) {
    float s = Fl::screen_driver()->scale(0);
    int bt = get_window_frame_sizes(pWindow);
    int minw, minh, maxw, maxh;
    pWindow->get_size_range(&minw, &minh, &maxw, &maxh, NULL, NULL, NULL);
    NSSize minSize = NSMakeSize(int(minw * s +.5) , int(minh * s +.5) + bt);
    NSSize maxSize = NSMakeSize(maxw ? int(maxw * s + .5):32000, maxh ? int(maxh * s +.5) + bt:32000);
    [(FLWindow*)i->xid setMinSize:minSize];
    [(FLWindow*)i->xid setMaxSize:maxSize];
  }
}

void Fl_Cocoa_Window_Driver::wait_for_expose()
{
    if (fl_mac_os_version < 101300) {
      [fl_xid(pWindow) recursivelySendToSubwindows:@selector(waitForExpose) applyToSelf:YES];
    } else {
      Fl_Window_Driver::wait_for_expose();
    }
}

/*
 * set the window title bar name
 */
void Fl_Cocoa_Window_Driver::label(const char *name, const char *mininame) {
  if (shown() || Fl_X::flx(pWindow)) {
    q_set_window_title(fl_xid(pWindow), name, mininame);
    if (fl_sys_menu_bar && Fl_Sys_Menu_Bar_Driver::window_menu_style())
      Fl_MacOS_Sys_Menu_Bar_Driver::driver()->rename_window(pWindow);
  }
}


/*
 * make a window visible
 */
void Fl_Cocoa_Window_Driver::show() {
  Fl_X *top = NULL;
  if (parent()) top = Fl_X::flx(pWindow->top_window());
  if (!shown() && (!parent() || (top && ![(FLWindow*)top->xid isMiniaturized]))) {
    makeWindow();
  } else {
    if ( !parent() ) {
      Fl_X *i = Fl_X::flx(pWindow);
      if ([(FLWindow*)i->xid isMiniaturized]) {
        i->w->redraw();
        [(FLWindow*)i->xid deminiaturize:nil];
      }
      if (!fl_capture) {
        [(FLWindow*)i->xid makeKeyAndOrderFront:nil];
      }
    }
    else pWindow->set_visible();
  }
}

/*
 * resize a window
 */
void Fl_Cocoa_Window_Driver::resize(int X, int Y, int W, int H) {
  if (!pWindow->shown() && (X != x() || Y != y())) force_position(1);
  if (view_resized() || !visible_r()) {
    pWindow->Fl_Group::resize(X, Y, W, H);
    if (!pWindow->shown()) pWindow->init_sizes();
  } else if (!through_resize()) {
    NSPoint pt = FLTKtoCocoa(pWindow, X, Y, H);
    FLWindow *xid = fl_xid(pWindow);
    through_resize(1);
    if (W != w() || H != h() || Fl_Window::is_a_rescale()) {
      NSRect r;
      float s = Fl::screen_driver()->scale(screen_num());
      int bt = get_window_frame_sizes(pWindow);
      r.origin = pt;
      r.size.width = round(W*s);
      r.size.height = round(H*s) + bt;
      if (NSEqualRects(r, [xid frame])) {
        pWindow->Fl_Group::resize(X, Y, W, H); // runs rarely, e.g. with scaled down test/tabs
        pWindow->redraw();
      } else {
        // First resize the logical FLTK coordinates for this and all children
        if (!Fl_Window::is_a_rescale())
          pWindow->Fl_Group::resize(X, Y, W, H);
        // Next update the physical Cocoa view
        [xid setFrame:r display:YES];
        [[xid contentView] displayIfNeededIgnoringOpacity];
        // Finally tell the the group to render its contents if the code above
        // didn't already
        pWindow->redraw();
      }
    }
    else {
      if (pWindow->parent()) starting_moved_window = pWindow;
      if (!NSEqualPoints([xid frame].origin, pt))
        [xid setFrameOrigin:pt]; // set cocoa coords to FLTK position
      else {
        x(X); y(Y);
      }
      if (pWindow->parent()) starting_moved_window = NULL;
    }
    through_resize(0);
  }

  // make sure subwindow doesn't leak outside parent
  if (pWindow->parent()) [fl_xid(pWindow) checkSubwindowFrame];
}


/*
 * make all drawing go into this window (called by subclass flush() impl.)

 This can be called in 3 different situations:

 1) When a window is created, resized or moved between low/high resolution displays.
 macOS sends the drawRect: message to the window view after having prepared the
 current graphics context to draw to this view.  The drawRect: method sets through_drawRect
 to YES and calls Fl_Window_Driver::flush(). Fl_Window_Driver::flush() calls
 Fl_Window::flush() that calls Fl_Window::make_current() that uses the graphics
 context of the window or the layer. The window's draw() function is then executed.

 2) At each round of the FLTK event loop.
 Fl::flush() is called, that calls Fl_Cocoa_Window_Driver::flush() on each window that needs drawing.
 Fl_Cocoa_Window_Driver::flush() sets through_Fl_X_Flush to YES and marks the view as
 needing display. The view is sent the displayIfNeededIgnoringOpacity or display message which makes
 the OS send the view the drawRect: message. The program proceeds next as in 1) above.

 3) An FLTK application can call Fl_Window::make_current() at any time before it draws to a window.
 This occurs for instance in the idle callback function of the mandelbrot test program. Variables
 through_Fl_X_flush and through_drawRect equal NO.
 Before 10.14: The window graphics context is obtained. Subsequent drawing requests go to the window.
 After 10.14: The layered view is marked as needing display. It will be sent the drawRect: message
 at the next event loop. Subsequent drawing operations, until drawRect: runs, are sent to view->aux_bitmap.

 CAUTION: it's not possible to call Fl::wait(), Fl::check() nor Fl::ready() while in the draw()
 function of a widget. Use an idle callback instead.
 */
void Fl_Cocoa_Window_Driver::make_current()
{
  q_release_context();
  Fl_X *i = Fl_X::flx(pWindow);
  //NSLog(@"region-count=%d damage=%u",i->region?i->region->count:0, pWindow->damage());
  fl_window = (FLWindow*)i->xid;
  ((Fl_Quartz_Graphics_Driver&)Fl_Graphics_Driver::default_driver()).high_resolution( mapped_to_retina() );

  if (pWindow->as_overlay_window() && other_xid && changed_resolution()) {
    destroy_double_buffer();
    changed_resolution(false);
  }
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
  FLView *view = (FLView*)[fl_window contentView];
  if (views_use_CA && !through_drawRect) { // detect direct calls from the app
    [view setNeedsDisplay:YES];
  }
  if (views_use_CA && view->aux_bitmap) {
    gc = view->aux_bitmap;
  } else
#endif
  {
    NSGraphicsContext *nsgc = (through_drawRect ? [NSGraphicsContext currentContext] :
      [NSGraphicsContext graphicsContextWithWindow:fl_window]);
    static SEL gc_sel = fl_mac_os_version >= 101000 ? @selector(CGContext) : @selector(graphicsPort);
    gc = (CGContextRef)[nsgc performSelector:gc_sel];
  }
  Fl_Graphics_Driver::default_driver().gc(gc);
#if defined(FLTK_HAVE_CAIROEXT)
  CGContextSaveGState(gc); // one extra level
#endif
  CGContextSaveGState(gc); // native context
  // antialiasing must be deactivated because it applies to rectangles too
  // and escapes even clipping!!!
  // it gets activated when needed (e.g., draw text)
  CGContextSetShouldAntialias(gc, false);
  CGFloat hgt = [[fl_window contentView] frame].size.height;
  float s = Fl::screen_driver()->scale(0);
  CGContextTranslateCTM(gc, 0.5f*s, hgt-0.5f*s);
  CGContextScaleCTM(gc, 1.0f, -1.0f); // now 0,0 is top-left point of the window
  CGContextScaleCTM(gc, s, s); // apply current scaling factor
  // for subwindows, limit drawing to inside of parent window
  // half pixel offset is necessary for clipping as done by fl_cgrectmake_cocoa()
  if (subRect()) {
    CGContextClipToRect(gc, CGRectOffset(*(subRect()), -0.5, -0.5));
  }
// this is the context with origin at top left of (sub)window
  CGContextSaveGState(gc);
  fl_clip_region( 0 );
#ifdef FLTK_HAVE_CAIROEXT
  // update the cairo_t context
  if (Fl::cairo_autolink_context()) Fl::cairo_make_current(pWindow);
#endif
}

// Give the Quartz context back to the system
void Fl_Cocoa_Window_Driver::q_release_context(Fl_Cocoa_Window_Driver *x) {
  CGContextRef gc = (CGContextRef)Fl_Graphics_Driver::default_driver().gc();
  if (x && x->shown() && x->gc != gc) return;
  if (!gc) return;
  CGContextRestoreGState(gc); // match the CGContextSaveGState's of make_current
  CGContextRestoreGState(gc);
  CGContextFlush(gc);
  Fl_Graphics_Driver::default_driver().gc(0);
#if defined(FLTK_HAVE_CAIROEXT)
  CGContextRestoreGState(gc);
#endif
}


static NSBitmapImageRep *pdf_to_nsbitmapimagerep(NSData *pdfdata) {
  NSImage *image = [[NSImage alloc] initWithData:pdfdata];
  NSInteger width = [image size].width * 2;
  NSInteger height = [image size].height * 2;
  NSBitmapImageRep *bitmap = [NSBitmapImageRep alloc];
  NSRect dest_r = NSMakeRect(0, 0, width, height);
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9
  if (fl_mac_os_version >= 100900) {
    // This procedure is necessary because initWithFocusedViewRect is deprecated in macOS 10.14
    // and because it produces a bitmap with floating point pixel values with macOS 11.x
    bitmap = [bitmap initWithBitmapDataPlanes:NULL
                                   pixelsWide:width
                                   pixelsHigh:height
                                bitsPerSample:8
                              samplesPerPixel:4
                                     hasAlpha:YES
                                     isPlanar:NO
                               colorSpaceName:NSDeviceRGBColorSpace
                                  bytesPerRow:0
                                 bitsPerPixel:0];
    NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
    [NSGraphicsContext saveGraphicsState];
    [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithBitmapImageRep:bitmap]];// 10.4
    [[NSColor clearColor] set];
    NSRect r = NSMakeRect(0, 0, width, height);
    NSRectFill(r);
    [image drawInRect:dest_r]; // 10.9
    [NSGraphicsContext restoreGraphicsState];
    [localPool release];
  } else
#endif
  {
    [image lockFocus];
    // the deprecation warning at 10.14 can be ignored because runs only for macOS < 10.9
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    bitmap = [bitmap initWithFocusedViewRect:dest_r];
#pragma clang diagnostic pop
    [image unlockFocus];
  }
  [bitmap setSize:[image size]];
  [image release];
  return bitmap;
}


Fl_Quartz_Copy_Surface_Driver::~Fl_Quartz_Copy_Surface_Driver()
{
  CGContextRestoreGState(gc);
  CGContextEndPage(gc);
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
  if (fl_mac_os_version >= 100500) CGPDFContextClose(gc); // needs 10.5, necessary with macOS 10.15
#endif
  CGContextRelease(gc);
  NSPasteboard *clip = [NSPasteboard generalPasteboard];
  [clip declareTypes:[NSArray arrayWithObjects:PDF_pasteboard_type, TIFF_pasteboard_type, nil] owner:nil];
  [clip setData:(NSData*)pdfdata forType:PDF_pasteboard_type];

  //second, transform this PDF to a bitmap image and put it as tiff in clipboard with retina resolution
  NSBitmapImageRep *bitmap = pdf_to_nsbitmapimagerep((NSData*)pdfdata);
  CFRelease(pdfdata);
  [clip setData:[bitmap TIFFRepresentation] forType:TIFF_pasteboard_type];
  [bitmap release];
  delete driver();
}

////////////////////////////////////////////////////////////////
// Copy & Paste fltk implementation.
////////////////////////////////////////////////////////////////

// clipboard variables definitions :
char *fl_selection_buffer[2] = {NULL, NULL};
int fl_selection_length[2] = {0, 0};
static int fl_selection_buffer_length[2];

extern void fl_trigger_clipboard_notify(int source);

static void clipboard_check(void)
{
  static NSInteger oldcount = -1;
  NSInteger newcount = [[NSPasteboard generalPasteboard] changeCount];
  if (newcount == oldcount) return;
  oldcount = newcount;
  fl_trigger_clipboard_notify(1);
}

static void resize_selection_buffer(int len, int clipboard) {
  if (len <= fl_selection_buffer_length[clipboard])
    return;
  delete[] fl_selection_buffer[clipboard];
  fl_selection_buffer[clipboard] = new char[len+100];
  fl_selection_buffer_length[clipboard] = len+100;
}

/*
 * create a selection
 * stuff: pointer to selected data
 * len: size of selected data
 * type: always "plain/text" for now
 */
void Fl_Cocoa_Screen_Driver::copy(const char *stuff, int len, int clipboard, const char *type) {
  if (!stuff || len<0) return;
  if (clipboard >= 2)
    clipboard = 1; // Only on X11 do multiple clipboards make sense.

  resize_selection_buffer(len+1, clipboard);
  memcpy(fl_selection_buffer[clipboard], stuff, len);
  fl_selection_buffer[clipboard][len] = 0; // needed for direct paste
  fl_selection_length[clipboard] = len;
  if (clipboard) {
    CFDataRef text = CFDataCreate(kCFAllocatorDefault, (UInt8*)fl_selection_buffer[1], len);
    if (text==NULL) return; // there was a pb creating the object, abort.
    NSPasteboard *clip = [NSPasteboard generalPasteboard];
    [clip declareTypes:[NSArray arrayWithObject:UTF8_pasteboard_type] owner:nil];
    [clip setData:(NSData*)text forType:UTF8_pasteboard_type];
    CFRelease(text);
  }
}

static int get_plain_text_from_clipboard(int clipboard)
{
  NSInteger length = 0;
  NSPasteboard *clip = [NSPasteboard generalPasteboard];
  NSString *found = [clip availableTypeFromArray:[NSArray arrayWithObjects:UTF8_pasteboard_type, @"public.utf16-plain-text", @"com.apple.traditional-mac-plain-text", nil]];
  if (found) {
    NSData *data = [clip dataForType:found];
    if (data) {
      NSInteger len;
      char *aux_c = NULL;
      if (![found isEqualToString:UTF8_pasteboard_type]) {
        NSString *auxstring;
        auxstring = (NSString *)CFStringCreateWithBytes(NULL, (const UInt8*)[data bytes],
                                  [data length],
                                  ([found isEqualToString:@"public.utf16-plain-text"] ?
                                  kCFStringEncodingUnicode : kCFStringEncodingMacRoman), false);
        aux_c = fl_strdup([auxstring UTF8String]);
        [auxstring release];
        len = strlen(aux_c) + 1;
      }
      else len = [data length] + 1;
      resize_selection_buffer((int)len, clipboard);
      if (![found isEqualToString:UTF8_pasteboard_type]) {
        strcpy(fl_selection_buffer[clipboard], aux_c);
        free(aux_c);
      }
      else {
        [data getBytes:fl_selection_buffer[clipboard] length:[data length]];
      }
      fl_selection_buffer[clipboard][len - 1] = 0;
      length = Fl_Screen_Driver::convert_crlf(fl_selection_buffer[clipboard], len - 1); // turn all \r characters into \n:
      Fl::e_clipboard_type = Fl::clipboard_plain_text;
    }
  }
  return (int)length;
}

static Fl_RGB_Image* get_image_from_clipboard(Fl_Widget *receiver)
{
  NSPasteboard *clip = [NSPasteboard generalPasteboard];
  NSArray *present = [clip types]; // types in pasteboard in order of decreasing preference
  NSArray  *possible = [NSArray arrayWithObjects:PDF_pasteboard_type, TIFF_pasteboard_type, PICT_pasteboard_type, nil];
  NSString *found = nil;
  NSUInteger rank;
  for (NSUInteger i = 0; (!found) && i < [possible count]; i++) {
    for (rank = 0; rank < [present count]; rank++) { // find first of possible types present in pasteboard
      if ([[present objectAtIndex:rank] isEqualToString:[possible objectAtIndex:i]]) {
        found = [present objectAtIndex:rank];
        break;
      }
    }
  }
  if (!found) return NULL;
  NSData *data = [clip dataForType:found];
  if (!data) return NULL;
  NSBitmapImageRep *bitmap = nil;
  if ([found isEqualToString:TIFF_pasteboard_type]) {
    bitmap = [[NSBitmapImageRep alloc] initWithData:data];
  }
  else if ([found isEqualToString:PDF_pasteboard_type] || [found isEqualToString:PICT_pasteboard_type]) {
    bitmap = pdf_to_nsbitmapimagerep(data);
  }
  if (!bitmap) return NULL;
  int bytesPerPixel((int)[bitmap bitsPerPixel]/8);
  int bpr((int)[bitmap bytesPerRow]);
  int hh((int)[bitmap pixelsHigh]);
  int ww((int)[bitmap pixelsWide]);
  uchar *imagedata = new uchar[bpr * hh];
  memcpy(imagedata, [bitmap bitmapData], bpr * hh);
  Fl_RGB_Image *image = new Fl_RGB_Image(imagedata, ww, hh, bytesPerPixel, (bpr == ww * bytesPerPixel ? 0 : bpr) );
  image->scale([bitmap size].width, [bitmap size].height);
  image->alloc_array = 1;
  [bitmap release];
  Fl::e_clipboard_type = Fl::clipboard_image;
  return image;
}

// Call this when a "paste" operation happens:
void Fl_Cocoa_Screen_Driver::paste(Fl_Widget &receiver, int clipboard, const char *type) {
  if (type[0] == 0) type = Fl::clipboard_plain_text;
  if (clipboard) {
    Fl::e_clipboard_type = "";
    if (strcmp(type, Fl::clipboard_plain_text) == 0) {
      fl_selection_length[1] = get_plain_text_from_clipboard(1);
    }
    else if (strcmp(type, Fl::clipboard_image) == 0) {
      Fl::e_clipboard_data = get_image_from_clipboard(&receiver);
      if (Fl::e_clipboard_data) {
        int done = receiver.handle(FL_PASTE);
        Fl::e_clipboard_type = "";
        if (done == 0) {
          delete (Fl_Image*)Fl::e_clipboard_data;
          Fl::e_clipboard_data = NULL;
        }
      }
      return;
    }
    else
      fl_selection_length[1] = 0;
  }
  Fl::e_text = fl_selection_buffer[clipboard];
  Fl::e_length = fl_selection_length[clipboard];
  if (!Fl::e_length) Fl::e_text = (char *)"";
  receiver.handle(FL_PASTE);
}

int Fl_Cocoa_Screen_Driver::clipboard_contains(const char *type) {
  NSString *found = nil;
  if (strcmp(type, Fl::clipboard_plain_text) == 0) {
    found = [[NSPasteboard generalPasteboard] availableTypeFromArray:[NSArray arrayWithObjects:UTF8_pasteboard_type, @"public.utf16-plain-text", @"com.apple.traditional-mac-plain-text", nil]];
    }
  else if (strcmp(type, Fl::clipboard_image) == 0) {
    found = [[NSPasteboard generalPasteboard] availableTypeFromArray:[NSArray arrayWithObjects:TIFF_pasteboard_type, PDF_pasteboard_type, PICT_pasteboard_type, nil]];
    }
  return found != nil;
}

void Fl_Cocoa_Window_Driver::destroy(FLWindow *xid) {
  [[xid parentWindow] removeChildWindow:xid]; // necessary until 10.6 at least
  if (fl_sys_menu_bar && Fl_Sys_Menu_Bar_Driver::window_menu_style())
    Fl_MacOS_Sys_Menu_Bar_Driver::driver()->remove_window([xid getFl_Window]);
  [xid close];
}


void Fl_Cocoa_Window_Driver::map() {
  FLWindow *xid = fl_xid(pWindow);
  if (pWindow && xid && ![xid parentWindow]) { // 10.2
    // after a subwindow has been unmapped, it has lost its parent window and its frame may be wrong
    [xid setSubwindowFrame];
  }
  if (cursor) {
    [cursor release];
    cursor = NULL;
  }
}


void Fl_Cocoa_Window_Driver::unmap() {
  FLWindow *xid = fl_xid(pWindow);
  if (pWindow && xid) {
    if (parent()) [[xid parentWindow] removeChildWindow:xid]; // necessary with at least 10.5
    [xid orderOut:nil];
  }
}


void Fl_Cocoa_Window_Driver::iconize() {
  [fl_xid(pWindow) miniaturize:nil];
}

static NSImage *CGBitmapContextToNSImage(CGContextRef c)
// the returned NSImage is autoreleased
{
  NSImage* image;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
  if (fl_mac_os_version >= 100600) {
    CGImageRef cgimg = CGBitmapContextCreateImage(c);  // requires 10.4
    image = [[NSImage alloc] initWithCGImage:cgimg size:NSZeroSize]; // requires 10.6
    CFRelease(cgimg);
  }
  else
#endif
    {
      NSBitmapImageRep *imagerep =
      [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
                                              pixelsWide:CGBitmapContextGetWidth(c)
                                              pixelsHigh:CGBitmapContextGetHeight(c)
                                           bitsPerSample:8
                                         samplesPerPixel:4
                                                hasAlpha:YES
                                                isPlanar:NO
                                          colorSpaceName:NSDeviceRGBColorSpace
                                             bytesPerRow:CGBitmapContextGetBytesPerRow(c)
                                            bitsPerPixel:CGBitmapContextGetBitsPerPixel(c)];
      memcpy([imagerep bitmapData], CGBitmapContextGetData(c),
             [imagerep bytesPerRow] * [imagerep pixelsHigh]);
      image = [[NSImage alloc] initWithSize:NSMakeSize([imagerep pixelsWide],
                                                       [imagerep pixelsHigh])];
      [image addRepresentation:imagerep];
      [imagerep release];
    }
  return [image autorelease];
}

int Fl_Cocoa_Window_Driver::set_cursor(Fl_Cursor c)
{
  if (cursor) {
    [(NSCursor*)cursor release];
    cursor = NULL;
  }

  switch (c) {
  case FL_CURSOR_ARROW:   cursor = [NSCursor arrowCursor]; break;
  case FL_CURSOR_CROSS:   cursor = [NSCursor crosshairCursor]; break;
  case FL_CURSOR_INSERT:  cursor = [NSCursor IBeamCursor]; break;
  case FL_CURSOR_HAND:    cursor = [NSCursor pointingHandCursor]; break;
  case FL_CURSOR_MOVE:    cursor = [NSCursor openHandCursor]; break;
  case FL_CURSOR_NS:      cursor = [NSCursor resizeUpDownCursor]; break;
  case FL_CURSOR_WE:      cursor = [NSCursor resizeLeftRightCursor]; break;
  case FL_CURSOR_N:       cursor = [NSCursor resizeUpCursor]; break;
  case FL_CURSOR_E:       cursor = [NSCursor resizeRightCursor]; break;
  case FL_CURSOR_W:       cursor = [NSCursor resizeLeftCursor]; break;
  case FL_CURSOR_S:       cursor = [NSCursor resizeDownCursor]; break;
  default:
    return 0;
  }

  [(NSCursor*)cursor retain];

  [fl_xid(pWindow) invalidateCursorRectsForView:[fl_xid(pWindow) contentView]];

  return 1;
}

int Fl_Cocoa_Window_Driver::set_cursor(const Fl_RGB_Image *image, int hotx, int hoty) {
  if (cursor) {
    [(NSCursor*)cursor release];
    cursor = NULL;
  }

  if ((hotx < 0) || (hotx >= image->w()))
    return 0;
  if ((hoty < 0) || (hoty >= image->h()))
    return 0;

  if (((Fl_RGB_Image*)image)->as_svg_image()) {
    Fl_RGB_Image *image2 = (Fl_RGB_Image*)image->copy();
    image2->normalize();
    image = image2;
  }
  // OS X >= 10.6 can create a NSImage from a CGImage, but we need to
  // support older versions, hence this pesky handling.

  NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc]
                              initWithBitmapDataPlanes:NULL
                              pixelsWide:image->data_w()
                              pixelsHigh:image->data_h()
                              bitsPerSample:8
                              samplesPerPixel:image->d()
                              hasAlpha:!(image->d() & 1)
                              isPlanar:NO
                              colorSpaceName:(image->d() <= 2 ?
                                              NSDeviceWhiteColorSpace : NSDeviceRGBColorSpace)
                              bytesPerRow:(image->data_w() * image->d())
                              bitsPerPixel:(image->d()*8)];

  // Alpha needs to be premultiplied for this format

  const uchar *i = (const uchar*)*image->data();
  const int extra_data = image->ld() ? (image->ld() - image->data_w() * image->d()) : 0;
  unsigned char *o = [bitmap bitmapData];
  for (int y = 0;y < image->data_h();y++) {
    if (!(image->d() & 1)) {
      for (int x = 0;x < image->data_w();x++) {
        unsigned int alpha;
        if (image->d() == 4) {
          alpha = i[3];
          *o++ = (unsigned char)((unsigned int)*i++ * alpha / 255);
          *o++ = (unsigned char)((unsigned int)*i++ * alpha / 255);
        }

        alpha = i[1];
        *o++ = (unsigned char)((unsigned int)*i++ * alpha / 255);
        *o++ = alpha;
        i++;
  }
    } else {
      // No alpha, so we can just copy everything directly.
      int len = image->data_w() * image->d();
      memcpy(o, i, len);
      o += len;
      i += len;
    }
    i += extra_data;
  }

  NSImage *nsimage = [[NSImage alloc]
                      initWithSize:NSMakeSize(image->w(), image->h())];

  [nsimage addRepresentation:bitmap];

  cursor = [[NSCursor alloc]
            initWithImage:nsimage
            hotSpot:NSMakePoint(hotx, hoty)];

  [fl_xid(pWindow) invalidateCursorRectsForView:[fl_xid(pWindow) contentView]];

  [bitmap release];
  [nsimage release];
  if (((Fl_RGB_Image*)image)->as_svg_image()) delete image;

  return 1;
}

@interface PrintWithTitlebarItem : NSMenuItem {
}
- (void) toggleCallback;
@end

@implementation PrintWithTitlebarItem
- (void) toggleCallback {
  NSMenuItem *item = [self representedObject];
  const char *title;
  if ([self state] == NSControlStateValueOn) {
    [self setState:NSControlStateValueOff];
    title = Fl_Mac_App_Menu::print_no_titlebar;
  } else {
    [self setState:NSControlStateValueOn];
    title = Fl_Mac_App_Menu::print;
  }
  [item setTitle:NSLocalizedString([NSString stringWithUTF8String:title], nil)];
}
@end

static PrintWithTitlebarItem *print_with_titlebar_item = NULL;

@interface FLaboutItemTarget : NSObject
{
}
- (BOOL)validateMenuItem:(NSMenuItem *)item;
- (void)showPanel;
- (void)printPanel;
- (void)terminate:(id)sender;
@end
@implementation FLaboutItemTarget
- (BOOL)validateMenuItem:(NSMenuItem *)item
{ // invalidate the Quit item of the application menu when running modal or when in native file chooser
  if ([[NSApp keyWindow] isKindOfClass:[NSSavePanel class]]) return NO;
  if (!Fl::modal() || [item action] != @selector(terminate:)) return YES;
  return NO;
}
- (void)showPanel
{
    NSDictionary *options;
    options = [NSDictionary dictionaryWithObjectsAndKeys:
               [[[NSAttributedString alloc]
                initWithString:[NSString stringWithFormat:@" GUI with FLTK %d.%d",
                FL_MAJOR_VERSION, FL_MINOR_VERSION ]] autorelease], @"Credits",
                             nil];
    [NSApp orderFrontStandardAboutPanelWithOptions:options];
}
- (void)printPanel
{
  bool grab_decoration = ([print_with_titlebar_item state] == NSControlStateValueOn);
  fl_lock_function();
  fl_print_or_copy_window(Fl::first_window(), grab_decoration, 1);
  fl_unlock_function();
}
- (void)terminate:(id)sender
{
  [NSApp terminate:sender];
}
@end

static void createAppleMenu(void)
{
  static BOOL donethat = NO;
  if (donethat) return;
  donethat = YES;
  NSMenu *mainmenu, *services = nil, *appleMenu;
  NSMenuItem *menuItem;
  NSString *title;

  SEL infodictSEL = (fl_mac_os_version >= 100200 ? @selector(localizedInfoDictionary) : @selector(infoDictionary));
  NSString *nsappname = [[[NSBundle mainBundle] performSelector:infodictSEL] objectForKey:@"CFBundleName"];
  if (nsappname == nil)
    nsappname = [[NSProcessInfo processInfo] processName];
  appleMenu = [[NSMenu alloc] initWithTitle:@""];
  /* Add menu items */
  title = [NSString stringWithFormat:NSLocalizedString([NSString stringWithUTF8String:Fl_Mac_App_Menu::about],nil), nsappname];
  menuItem = [appleMenu addItemWithTitle:title action:@selector(showPanel) keyEquivalent:@""];
  FLaboutItemTarget *about = [[FLaboutItemTarget alloc] init];
  [menuItem setTarget:about];
  [appleMenu addItem:[NSMenuItem separatorItem]];
  // Print front window
  title = NSLocalizedString([NSString stringWithUTF8String:Fl_Mac_App_Menu::print], nil);
  if ([title length] > 0) {
    menuItem = [appleMenu
                addItemWithTitle:title
                action:@selector(printPanel)
                keyEquivalent:@""];
    [menuItem setTarget:about];
    [menuItem setEnabled:YES];
  // Toggle "Print Window with titlebar" / "Print Window"
    title = NSLocalizedString([NSString stringWithUTF8String:Fl_Mac_App_Menu::toggle_print_titlebar], nil);
    print_with_titlebar_item = [[PrintWithTitlebarItem alloc] initWithTitle:title
                                                  action:@selector(toggleCallback)
                                           keyEquivalent:@""];
    [appleMenu addItem:print_with_titlebar_item];
    [print_with_titlebar_item setTarget:print_with_titlebar_item];
    [print_with_titlebar_item setRepresentedObject:menuItem];
    [print_with_titlebar_item setState:NSControlStateValueOn];
    [print_with_titlebar_item setEnabled:YES];
    [appleMenu addItem:[NSMenuItem separatorItem]];
    }
  if (fl_mac_os_version >= 100400) { // services+hide+quit already in menu in OS 10.3
    // Services Menu
    services = [[NSMenu alloc] initWithTitle:@""];
    menuItem = [appleMenu
                addItemWithTitle:NSLocalizedString([NSString stringWithUTF8String:Fl_Mac_App_Menu::services], nil)
                action:nil
                keyEquivalent:@""];
    [appleMenu setSubmenu:services forItem:menuItem];
    [appleMenu addItem:[NSMenuItem separatorItem]];
    // Hide AppName
    title = [NSString stringWithFormat:NSLocalizedString([NSString stringWithUTF8String:Fl_Mac_App_Menu::hide],nil), nsappname];
    [appleMenu addItemWithTitle:title
                         action:@selector(hide:)
                  keyEquivalent:@"h"];
    // Hide Others
    menuItem = [appleMenu
                addItemWithTitle:NSLocalizedString(
                  [NSString stringWithUTF8String:Fl_Mac_App_Menu::hide_others] , nil)
                action:@selector(hideOtherApplications:)
                keyEquivalent:@"h"];
    [menuItem setKeyEquivalentModifierMask:(NSEventModifierFlagOption|NSEventModifierFlagCommand)];
    // Show All
    [appleMenu addItemWithTitle:NSLocalizedString(
                                  [NSString stringWithUTF8String:Fl_Mac_App_Menu::show], nil)
                         action:@selector(unhideAllApplications:)
                  keyEquivalent:@""];
    [appleMenu addItem:[NSMenuItem separatorItem]];
    // Quit AppName
    title = [NSString stringWithFormat:NSLocalizedString(
                                        [NSString stringWithUTF8String:Fl_Mac_App_Menu::quit], nil),
             nsappname];
    menuItem = [appleMenu addItemWithTitle:title
                                    action:@selector(terminate:)
                             keyEquivalent:@"q"];
    [menuItem setTarget:about];
    }
  /* Put menu into the menubar */
  menuItem = [[NSMenuItem alloc] initWithTitle:@"" action:nil keyEquivalent:@""];
  [menuItem setSubmenu:appleMenu];
  mainmenu = [[NSMenu alloc] initWithTitle:@""];
  [mainmenu addItem:menuItem];
  if (fl_mac_os_version < 100600) {
    //  [NSApp setAppleMenu:appleMenu];
    //  to avoid compiler warning raised by use of undocumented setAppleMenu    :
    [NSApp performSelector:@selector(setAppleMenu:) withObject:appleMenu];
  }
  [NSApp setMainMenu:mainmenu];
  if (services) {
    [NSApp setServicesMenu:services];
    [services release];
    }
  [mainmenu release];
  [appleMenu release];
  [menuItem release];
  Fl_MacOS_Sys_Menu_Bar_Driver::driver();
}


void Fl_Cocoa_Window_Driver::set_key_window()
{
  [fl_xid(pWindow) makeKeyWindow];
}

static NSImage *imageFromText(const char *text, int *pwidth, int *pheight)
{
  const char *p, *q;
  int width = 0, height, w2, ltext = (int)strlen(text);
  fl_font(FL_HELVETICA, 10);
  p = text;
  int nl = 0;
  while(nl < 100 && (q=strchr(p, '\n')) != NULL) {
    nl++;
    w2 = (int)fl_width(p, (int)(q - p));
    if (w2 > width) width = w2;
    p = q + 1;
  }
  if (text[ ltext - 1] != '\n') {
    nl++;
    w2 = int(fl_width(p));
    if (w2 > width) width = w2;
  }
  height = nl * fl_height() + 3;
  width += 6;
  Fl_Image_Surface *off = new Fl_Image_Surface(width, height, 1);
  Fl_Surface_Device::push_current(off);
  CGContextSetRGBFillColor( (CGContextRef)off->offscreen(), 0,0,0,0);
  fl_rectf(0,0,width,height);
  fl_color(FL_BLACK);
  p = text;
  fl_font(FL_HELVETICA, 10);
  int y = fl_height();
  while(TRUE) {
    q = strchr(p, '\n');
    if (q) {
      fl_draw(p, (int)(q - p), 3, y);
    } else {
      fl_draw(p, 3, y);
      break;
    }
    y += fl_height();
    p = q + 1;
  }
  Fl_Surface_Device::pop_current();
  NSImage* image = CGBitmapContextToNSImage( (CGContextRef)off->offscreen() );
  delete off;
  *pwidth = width;
  *pheight = height;
  return image;
}

static NSImage *defaultDragImage(int *pwidth, int *pheight)
{
  const int version_threshold = 100700;
  int width, height;
  if (fl_mac_os_version >= version_threshold) {
    width = 50; height = 40;
    }
  else {
    width = 16; height = 16;
    }
  Fl_Image_Surface *off = new Fl_Image_Surface(width, height, 1);
  Fl_Surface_Device::push_current(off);
  if (fl_mac_os_version >= version_threshold) {
    fl_font(FL_HELVETICA, 20);
    fl_color(FL_BLACK);
    char str[4];
    // the "Delivery truck" Unicode character from "Apple Color Emoji" font
    int l = fl_utf8encode(0x1F69A, str);
    fl_draw(str, l, 1, 16);
    }
  else { // draw two squares
    CGContextSetRGBFillColor( (CGContextRef)off->offscreen(), 0,0,0,0);
    fl_rectf(0,0,width,height);
    CGContextSetRGBStrokeColor( (CGContextRef)off->offscreen(), 0,0,0,0.6);
    fl_rect(0,0,width,height);
    fl_rect(2,2,width-4,height-4);
  }
  Fl_Surface_Device::pop_current();
  NSImage* image = CGBitmapContextToNSImage( (CGContextRef)off->offscreen() );
  delete off;
  *pwidth = width;
  *pheight = height;
  return image;
}


int Fl_Cocoa_Screen_Driver::dnd(int use_selection)
{
  CFDataRef text = CFDataCreate(kCFAllocatorDefault, (UInt8*)fl_selection_buffer[0], fl_selection_length[0]);
  if (text==NULL) return false;
  NSAutoreleasePool *localPool;
  localPool = [[NSAutoreleasePool alloc] init];
  Fl_Widget *w = Fl::pushed();
  Fl_Window *win = w->top_window();
  FLView *myview = (FLView*)[fl_mac_xid(win) contentView];
  NSEvent *theEvent = [NSApp currentEvent];

  int width, height;
  NSImage *image;
  if (use_selection) {
    fl_selection_buffer[0][ fl_selection_length[0] ] = 0;
    image = imageFromText(fl_selection_buffer[0], &width, &height);
  } else {
    image = defaultDragImage(&width, &height);
  }

  NSPoint pt = [theEvent locationInWindow];
  pt.x -= width/2;
  pt.y -= height/2;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
  if (fl_mac_os_version >= 100700) {
    NSPasteboardItem *pbItem = [[[NSPasteboardItem alloc] init] autorelease];
    [pbItem setData:(NSData*)text forType:UTF8_pasteboard_type];
    NSDraggingItem *dragItem = [[[NSDraggingItem alloc] initWithPasteboardWriter:pbItem] autorelease];
    NSRect r = {pt, {CGFloat(width), CGFloat(height)}};
    [dragItem setDraggingFrame:r contents:image];
    [myview beginDraggingSessionWithItems:[NSArray arrayWithObject:dragItem] event:theEvent source:myview];
  } else
#endif
  {
    static NSSize offset={0,0};
    // the 2 deprecation warnings can be ignored because this runs only for macOS < 10.7
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    // deprecated in 10.13
    NSPasteboard *mypasteboard = [NSPasteboard pasteboardWithName:NSDragPboard];
    [mypasteboard declareTypes:[NSArray arrayWithObject:UTF8_pasteboard_type] owner:nil];
    [mypasteboard setData:(NSData*)text forType:UTF8_pasteboard_type];
    [myview dragImage:image  at:pt  offset:offset // deprecated in 10.7
                event:theEvent  pasteboard:mypasteboard
               source:myview  slideBack:YES];
#pragma clang diagnostic pop
    if ( w ) {
      int old_event = Fl::e_number;
      w->handle(Fl::e_number = FL_RELEASE);
      Fl::e_number = old_event;
      Fl::pushed( 0 );
    }
  }
  CFRelease(text);
  [localPool release];
  return true;
}

// rescales an NSBitmapImageRep (and also rewrites it with integer pixels)
static NSBitmapImageRep *scale_nsbitmapimagerep(NSBitmapImageRep *img, float scale)
{
  int w = (int)[img pixelsWide];
  int h = (int)[img pixelsHigh];
  long int scaled_w = lround(scale * w);
  long int scaled_h = lround(scale * h);
  NSBitmapImageRep *scaled = [[NSBitmapImageRep alloc]  initWithBitmapDataPlanes:NULL
                                                                      pixelsWide:scaled_w
                                                                      pixelsHigh:scaled_h
                                                                   bitsPerSample:8
                                                                 samplesPerPixel:4
                                                                        hasAlpha:YES
                                                                        isPlanar:NO
                                                                  colorSpaceName:NSDeviceRGBColorSpace
                                                                     bytesPerRow:scaled_w*4
                                                                    bitsPerPixel:32];
  NSDictionary *dict =
  [NSDictionary dictionaryWithObject:scaled
                              forKey:NSGraphicsContextDestinationAttributeName];
  NSGraphicsContext *oldgc = [NSGraphicsContext currentContext];
  [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithAttributes:dict]];
  [[NSColor clearColor] set];
  NSRect r = NSMakeRect(0, 0, scaled_w, scaled_h);
  NSRectFill(r);
  [img drawInRect:r];
  [NSGraphicsContext setCurrentContext:oldgc];
  [img release];
  return scaled;
}

static void write_bitmap_inside(NSBitmapImageRep *to, int to_width, NSBitmapImageRep *from,
                                int to_x, int to_y)
/* Copies in bitmap "to" the bitmap "from" with its top-left angle at coordinates to_x, to_y
 On retina displays both bitmaps have double width and height
 to_width is the width in screen units of "to". On retina, its pixel width is twice that.
 */
{
  const uchar *from_data = [from bitmapData];
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
  if (fl_mac_os_version >= 100400) { // 10.4 required by the bitmapFormat message
    if (([to bitmapFormat] & NSBitmapFormatAlphaFirst) &&
        !([from bitmapFormat] & NSBitmapFormatAlphaFirst) ) {
      // "to" is ARGB and "from" is RGBA --> convert "from" to ARGB
      // it is enough to read "from" starting one byte earlier, because A is always 0xFF:
      // RGBARGBA becomes (A)RGBARGB
      from_data--;
    } else if ( !([to bitmapFormat] & NSBitmapFormatAlphaFirst) && ([from bitmapFormat] & NSBitmapFormatAlphaFirst) ) {
      // "from" is ARGB and "to" is RGBA --> convert "from" to RGBA
      // it is enough to offset reading by one byte because A is always 0xFF
      // so ARGBARGB becomes RGBARGB(A) as needed
      from_data++;
    }
  }
#endif
  int to_w = (int)[to pixelsWide]; // pixel width of "to"
  int from_w = (int)[from pixelsWide]; // pixel width of "from"
  int from_h = (int)[from pixelsHigh]; // pixel height of "from"
  int to_depth = (int)[to samplesPerPixel];
  int from_depth = (int)[from samplesPerPixel];
  int depth = 0;
  if (to_depth > from_depth) depth = from_depth;
  else if (from_depth > to_depth) depth = to_depth;
  float factor = to_w / (float)to_width; // scaling factor is 1 for classic displays and 2 for retina
  to_x = factor*to_x; // transform offset from screen unit to pixels
  to_y = factor*to_y;
  // perform the copy
  uchar *tobytes = [to bitmapData] + to_y * to_w * to_depth + to_x * to_depth;
  const uchar *frombytes = from_data;
  for (int i = 0; i < from_h; i++) {
    if (depth == 0) { // depth is always 0 in case of RGBA <-> ARGB conversion
      if (i == 0 && from_data < [from bitmapData]) {
        memcpy(tobytes+1, frombytes+1, from_w * from_depth-1); // avoid reading before [from bitmapData]
        *tobytes = 0xFF; // set the very first A byte
      } else if (i == from_h - 1 && from_data > [from bitmapData]) {
        memcpy(tobytes, frombytes, from_w * from_depth - 1); // avoid reading after end of [from bitmapData]
        *(tobytes + from_w * from_depth - 1) = 0xFF; // set the very last A byte
      } else {
        memcpy(tobytes, frombytes, from_w * from_depth);
      }
    } else {
      for (int j = 0; j < from_w; j++) {
        memcpy(tobytes + j * to_depth, frombytes + j * from_depth, depth);
      }
    }
    tobytes += to_w * to_depth;
    frombytes += from_w * from_depth;
  }
}


static NSBitmapImageRep* GL_rect_to_nsbitmap(Fl_Window *win, int x, int y, int w, int h)
// captures a rectangle from a GL window and returns it as an allocated NSBitmapImageRep
// the capture has high res on retina
{
  Fl_Device_Plugin *plugin = Fl_Device_Plugin::opengl_plugin();
  if (!plugin) return nil;
  Fl_RGB_Image *img = plugin->rectangle_capture(win, x, y, w, h);
  NSBitmapImageRep* bitmap = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL pixelsWide:img->w() pixelsHigh:img->h() bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES isPlanar:NO colorSpaceName:NSDeviceRGBColorSpace bytesPerRow:4*img->w() bitsPerPixel:32];
  if (img->d() == 4) memcpy([bitmap bitmapData], img->array, 4*img->data_w()*img->data_h());
  else {
    memset([bitmap bitmapData], 0xFF, [bitmap bytesPerPlane]);
    const uchar *from = img->array;
    for (int r = 0; r < img->h(); r++) {
      uchar *to = [bitmap bitmapData] + r * [bitmap bytesPerRow];
      for (int c = 0; c < img->w(); c++) {
        memcpy(to, from, 3);
        from += 3;
        to += 4;
      }
    }
  }
  delete img;
  return bitmap;
}

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
static NSBitmapImageRep* rect_to_NSBitmapImage_layer(Fl_Window *win, int x, int y, int w, int h)
{ // capture window data for layer-based views because initWithFocusedViewRect: does not work for them
  FLView *view = (FLView*)[fl_xid(win) contentView];
  if (!view->aux_bitmap) return nil;
  CGImageRef cgimg = CGBitmapContextCreateImage(view->aux_bitmap);
  if (x || y || w != win->w() || h != win->h()) {
    float s = Fl::screen_driver()->scale(0);
    if (Fl_Cocoa_Window_Driver::driver(win)->mapped_to_retina()) s *= 2;
    CGRect rect = CGRectMake(x * s, y * s, w * s, h * s);
    CGImageRef cgimg2 = CGImageCreateWithImageInRect(cgimg, rect);
    CGImageRelease(cgimg);
    cgimg = cgimg2;
  }
  NSBitmapImageRep *bitmap = (cgimg ? [[NSBitmapImageRep alloc] initWithCGImage:cgimg/*10.5*/] : nil);
  CGImageRelease(cgimg);
  return bitmap;
}
#endif

static NSBitmapImageRep* rect_to_NSBitmapImageRep(Fl_Window *win, int x, int y, int w, int h) {
    NSBitmapImageRep *bitmap = nil;
    NSRect rect;
    float s = Fl_Graphics_Driver::default_driver().scale();
    if (win->as_gl_window() && y >= 0) {
      bitmap = GL_rect_to_nsbitmap(win, x, y, w, h);
    }
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
    else if (views_use_CA) {
        bitmap = rect_to_NSBitmapImage_layer(win, x, y, w, h);
    }
#endif
    else {
      NSView *winview = nil;
      if ( through_Fl_X_flush  && Fl_Window::current() == win ) {
        rect = NSMakeRect(x - 0.5, y - 0.5, w, h);
      }
      else {
        winview = [fl_xid(win) contentView];
        int view_h = [winview frame].size.height;
        rect = NSMakeRect(int(x*s), int(view_h-y*s-int(h*s)), int(w*s), int(h*s));
        // lock focus to win's view
  #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
        if (fl_mac_os_version >= 101100) {
          NSGraphicsContext *ctxt = [fl_xid(win)
                                     performSelector:@selector(graphicsContext)];
          [ctxt saveGraphicsState]; // necessary under 10.11
        }
  #endif
        [winview performSelector:@selector(lockFocus)];
      }
      // The image depth is 3 until macOS 10.5 and 4 with 10.6 and above
      // the deprecation warning at 10.14 can be ignored because runs only for macOS < 10.14
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
      bitmap = [[NSBitmapImageRep alloc] initWithFocusedViewRect:rect];
#pragma clang diagnostic pop
      if ( !( through_Fl_X_flush && Fl_Window::current() == win) ) {
        [winview performSelector:@selector(unlockFocus)];
  #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
        if (fl_mac_os_version >= 101100) {
          NSGraphicsContext *ctxt = [fl_xid(win)
                                     performSelector:@selector(graphicsContext)];
          [ctxt restoreGraphicsState];
        }
  #endif
      }
    }
  return bitmap;
}

static NSBitmapImageRep* rect_to_NSBitmapImageRep_subwins(Fl_Window *win, int x, int y, int w, int h, bool capture_subwins)
/* Captures a rectangle from a mapped window.
 On retina displays, the resulting bitmap has 2 pixels per screen unit.
 The returned value is to be released after use
 */
{
  Fl_Rect r(x, y, w, h);
  NSBitmapImageRep *bitmap = [fl_xid(win) rect_to_NSBitmapImageRep:&r];
  if (!capture_subwins || !bitmap) return bitmap;

  // capture also subwindows
  NSArray *children = [fl_xid(win) childWindows]; // 10.2
  NSEnumerator *enumerator = [children objectEnumerator];
  id child;
  while ((child = [enumerator nextObject]) != nil) {
    if (![child isKindOfClass:[FLWindow class]]) continue;
    Fl_Window *sub = [(FLWindow*)child getFl_Window];
    CGRect rsub = CGRectMake(sub->x(), win->h() -(sub->y()+sub->h()), sub->w(), sub->h());
    CGRect clip = CGRectMake(x, win->h()-(y+h), w, h);
    clip = CGRectIntersection(rsub, clip);
    if (CGRectIsNull(clip)) continue;
    NSBitmapImageRep *childbitmap = rect_to_NSBitmapImageRep_subwins(sub, clip.origin.x - sub->x(),
                                                             win->h() - clip.origin.y - sub->y() - clip.size.height, clip.size.width, clip.size.height, true);
    if (childbitmap) {
      // if bitmap is high res and childbitmap is not, childbitmap must be rescaled
      if (!win->as_gl_window() && Fl_Cocoa_Window_Driver::driver(win)->mapped_to_retina() &&
          sub->as_gl_window() && !Fl::use_high_res_GL()) {
        childbitmap = scale_nsbitmapimagerep(childbitmap, 2);
      }
      float s = Fl_Graphics_Driver::default_driver().scale();
      write_bitmap_inside(bitmap, w * s, childbitmap,
                          (clip.origin.x - x) * s,
                          (win->h() - clip.origin.y - clip.size.height - y) * s );
    }
    [childbitmap release];
  }
  return bitmap;
}

static void nsbitmapProviderReleaseData (void *info, const void *data, size_t size)
{
  [(NSBitmapImageRep*)info release];
}

CGImageRef Fl_Cocoa_Window_Driver::CGImage_from_window_rect(int x, int y, int w, int h, bool capture_subwins)
/* Returns a capture of a rectangle of a mapped window as a CGImage.
 With retina displays, the returned image has twice the width and height.
 CFRelease the returned CGImageRef after use
 */
{
  CGImageRef img;
  NSBitmapImageRep *bitmap = rect_to_NSBitmapImageRep_subwins(pWindow, x, y, w, h, capture_subwins);
  if (fl_mac_os_version >= 100500) {
    img = (CGImageRef)[bitmap performSelector:@selector(CGImage)]; // requires Mac OS 10.5
    CGImageRetain(img);
    [bitmap release];
  } else {
    CGColorSpaceRef cspace = CGColorSpaceCreateDeviceRGB();
    CGDataProviderRef provider =
    CGDataProviderCreateWithData(bitmap, [bitmap bitmapData],
                                 [bitmap bytesPerRow] * [bitmap pixelsHigh],
                                 nsbitmapProviderReleaseData);
    img = CGImageCreate([bitmap pixelsWide], [bitmap pixelsHigh], 8, [bitmap bitsPerPixel],
                        [bitmap bytesPerRow], cspace,
                        ([bitmap bitsPerPixel] == 32 ? kCGImageAlphaPremultipliedLast :
                          kCGImageAlphaNone) ,
                        provider, NULL, false, kCGRenderingIntentDefault);
    CGColorSpaceRelease(cspace);
    CGDataProviderRelease(provider);
  }
  return img;
}

int Fl_Cocoa_Window_Driver::decorated_w()
{
  if (!shown() || parent() || !border() || !visible())
    return w();
  int bx=0;
  get_window_frame_sizes(pWindow, &bx);
  return w() + 2 * bx;
}

int Fl_Cocoa_Window_Driver::decorated_h()
{
  if (!shown() || parent() || !border() || !visible())
    return h();
  int bx = 0, by = 0;
  int bt = get_window_frame_sizes(pWindow, &bx, &by);
  float s = Fl::screen_driver()->scale(0);
  return h() + bt/s;
}

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_15_0 && defined(__BLOCKS__)

// Requires -weak_framework ScreenCaptureKit and used by FLTK for macOS ≥ 15.0
static CGImageRef capture_decorated_window_SCK(NSWindow *nswin) {
  if (@available(macOS 15.0, *)) {
    __block CGImageRef capture = NULL;
    __block BOOL capture_err = NO;
    void (^block_to_stop_main_loop)(void) = ^{ CFRunLoopStop(CFRunLoopGetMain()); };
    // Fix for bug in ScreenCaptureKit that modifies a window's styleMask the first time
    // it captures a non-resizable window. We memorize each non-resizable window's styleMask,
    // and we restore modified styleMasks later, after the screen capture.
    NSMutableArray *xid_array = [NSMutableArray arrayWithCapacity:2];
    NSMutableArray *mask_array = [NSMutableArray arrayWithCapacity:2];
    Fl_Window *win = Fl::first_window();
    while (win) {
      if (!win->parent() && win->border()) {
        FLWindow *xid = fl_mac_xid(win);
        if (xid && !([xid styleMask] & NSWindowStyleMaskResizable)) {
          [xid_array addObject:xid];
          NSUInteger mask = [xid styleMask];
          [mask_array addObject:[NSData dataWithBytes:&mask length:sizeof(NSUInteger)]];
        }
      }
      win = Fl::next_window(win);
    }
    CGWindowID target_id = [nswin windowNumber];
    NSRect r = [nswin frame];
    int W = r.size.width, H = r.size.height;
    [SCShareableContent getCurrentProcessShareableContentWithCompletionHandler: // macOS 14.4
     ^(SCShareableContent *shareableContent, NSError *error) {
      SCWindow *scwin = nil;
      if (!error) {
        NSEnumerator *enumerator = [[shareableContent windows] objectEnumerator];
        while ((scwin = (SCWindow*)[enumerator nextObject]) != nil) {
          if ([scwin windowID] == target_id) {
            break;
          }
        }
      }
      if (!scwin) {
        capture_err = YES;
        dispatch_async(dispatch_get_main_queue(), block_to_stop_main_loop);
        return;
      }
      SCContentFilter *filter = [[[SCContentFilter alloc] initWithDesktopIndependentWindow:scwin] autorelease];
      int s = (int)[filter pointPixelScale];
      SCStreamConfiguration *config = [[[SCStreamConfiguration alloc] init] autorelease];
      [config setIgnoreShadowsSingleWindow:YES];
      [config setIgnoreShadowsDisplay:YES]; // necessary with macOS 26 Tahoe
      [config setShowsCursor:NO];
      [config setWidth:W*s];
      [config setHeight:H*s];
      [config setIncludeChildWindows:NO]; // macOS 14.2
      [SCScreenshotManager captureImageWithFilter:filter
                                    configuration:config
                                completionHandler:^(CGImageRef sampleBuffer, NSError *error) {
        if (error) capture_err = YES;
        else {
          capture = sampleBuffer;
          CGImageRetain(capture);
        }
        dispatch_async(dispatch_get_main_queue(), block_to_stop_main_loop);
      }
      ];
    }
    ];
    // run the main loop until the 1 or 2 blocks above have completed and have stopped the loop
    while (!capture_err && !capture) CFRunLoopRun();
    if (capture_err) return NULL;
    // ScreenCaptureKit bug cont'd: restore modified styleMasks.
    for (int i = 0, count = [xid_array count]; i < count; i++) {
      NSUInteger mask;
      [(NSData*)[mask_array objectAtIndex:i] getBytes:&mask length:sizeof(NSUInteger)];
      NSWindow *xid = (NSWindow*)[xid_array objectAtIndex:i];
      if (mask != [xid styleMask]) [xid setStyleMask:mask];
    }
    return capture;
  } else return NULL;
}
#endif //MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_15_0


CGImageRef Fl_Cocoa_Window_Driver::capture_decorated_window_10_5(NSWindow *nswin) {
  // usable with 10.5 and above
  CGImageRef img = NULL;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
#  if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_15_0 && defined(__BLOCKS__)
  if (fl_mac_os_version >= 150000)
      img = capture_decorated_window_SCK(nswin);
  else
#endif
    {
#  if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_VERSION_15_0
      NSInteger win_id = [nswin windowNumber];
      CFArrayRef array = CFArrayCreate(NULL, (const void**)&win_id, 1, NULL);
      img = CGWindowListCreateImageFromArray(CGRectNull, array, kCGWindowImageBoundsIgnoreFraming); // 10.5
      CFRelease(array);
#  endif
    }
#endif // >= MAC_OS_X_VERSION_10_5
  return img;
}


static CGImageRef capture_window_titlebar(Fl_Window *win, Fl_Cocoa_Window_Driver *cocoa_dr) {
  CGImageRef img;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
  if (fl_mac_os_version >= 100600) { // verified OK from 10.6
    FLWindow *nswin = fl_xid(win);
    CGImageRef img_full = Fl_Cocoa_Window_Driver::capture_decorated_window_10_5(nswin);
    int bt =  [nswin frame].size.height - [[nswin contentView] frame].size.height;
    int s = CGImageGetWidth(img_full) / [nswin frame].size.width;
    CGRect cgr = CGRectMake(0, 0, CGImageGetWidth(img_full), bt * s);
    img = CGImageCreateWithImageInRect(img_full, cgr); // 10.4
    CGImageRelease(img_full);
  } else
#endif
  {
    int w = win->w(), h = win->decorated_h() - win->h();
    Fl_Graphics_Driver::default_driver().scale(1);
    img = cocoa_dr->CGImage_from_window_rect(0, -h, w, h, false);
    Fl_Graphics_Driver::default_driver().scale(Fl::screen_driver()->scale(win->screen_num()));
  }
  return img;
}


void Fl_Cocoa_Window_Driver::draw_titlebar_to_context(CGContextRef gc, int w, int h)
{
  FLWindow *nswin = fl_xid(pWindow);
  if ([nswin canBecomeMainWindow]) [nswin makeMainWindow];
  [NSApp nextEventMatchingMask:NSEventMaskAny untilDate:nil inMode:NSDefaultRunLoopMode dequeue:NO];
  CGImageRef img = capture_window_titlebar(pWindow, this);
  if (img) {
    CGContextSaveGState(gc);
    if (fl_mac_os_version < 100600) clip_to_rounded_corners(gc, w, h);
    CGContextDrawImage(gc, CGRectMake(0, 0, w, h), img);
    CGImageRelease(img);
    CGContextRestoreGState(gc);
  }
}


/* Returns the version of the running Mac OS as an int such as 100802 for 10.8.2,
 and also assigns that value to global fl_mac_os_version.
 N.B.: macOS "Big Sur" 11.0 can produce 2 different values for fl_mac_os_version:
  - when SDK 11.0 is used, fl_mac_os_version is set to 110000 (or bigger)
  - when SDK 10.15 or earlier is used, fl_mac_os_version is set to 101600
  That is reported to facilitate life of apps that assumed majorVersion would remain equal to 10
  and used only minorVersion to determine what is the running version of macOS.
 */
int Fl_Darwin_System_Driver::calc_mac_os_version() {
  if (fl_mac_os_version) return fl_mac_os_version;
  int M = 0, m = 0, b = 0;
  NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_10
  if ([NSProcessInfo instancesRespondToSelector:@selector(operatingSystemVersion)]) {
    NSOperatingSystemVersion version = [[NSProcessInfo processInfo] operatingSystemVersion];
    M = (int)version.majorVersion;
    m = (int)version.minorVersion;
    b = (int)version.patchVersion;
  }
  else
#endif
  {
    NSDictionary * sv = [NSDictionary dictionaryWithContentsOfFile:@"/System/Library/CoreServices/SystemVersion.plist"];
    const char *s = [[sv objectForKey:@"ProductVersion"] UTF8String];
    sscanf(s, "%d.%d.%d", &M, &m, &b);
  }
  [localPool release];
  fl_mac_os_version = M*10000 + m*100 + b;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
  if (fl_mac_os_version >= 101400) views_use_CA = YES;
#endif
  return fl_mac_os_version;
}

/*
 Note: `prefs` can be NULL!
 */
char *Fl_Darwin_System_Driver::preference_rootnode(Fl_Preferences * /*prefs*/, Fl_Preferences::Root root,
                                                   const char *vendor, const char *application)
{
  static char *filename = 0L;

  // Allocate this only when we need it, but then keep it allocated.
  if (!filename) filename = (char*)::calloc(1, FL_PATH_MAX);

  switch (root&Fl_Preferences::ROOT_MASK) {
    case Fl_Preferences::SYSTEM:
      // This is safe, even on machines that use different languages
      strcpy(filename, "/Library/Preferences");
      break;
    case Fl_Preferences::USER:
    { // Find the home directory, but return NULL if components were not found.
      // If we ever port this to iOS: NSHomeDirectory returns tha location of the app!
      const char *e = ::getenv("HOME");
      // if $HOME does not exist, try NSHomeDirectory, the Mac way.
      NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
      if ( (e==0L) || (e[0]==0) || (::access(e, F_OK)==-1) ) {
        NSString *nsHome = NSHomeDirectory();
        if (nsHome)
          e = [nsHome UTF8String];
      }
      // if NSHomeDirectory does not work, try getpwuid(), the Unix way.
      if ( (e==0L) || (e[0]==0) || (::access(e, F_OK)==-1) ) {
        struct passwd *pw = getpwuid(getuid());
        e = pw->pw_dir;
      }
      snprintf(filename, FL_PATH_MAX, "%s/Library/Preferences", e);
      [localPool release];
      break; }
  }

  // Make sure that the parameters are not NULL
  if ( (vendor==0L) || (vendor[0]==0) )
    vendor = "unknown";
  if ( (application==0L) || (application[0]==0) )
    application = "unknown";

  // Our C path names for preferences will be:
  // SYSTEM: "/Library/Preferences/$vendor/$application.prefs"
  // USER: "/Users/$user/Library/Preferences/$vendor/$application.prefs"
  snprintf(filename + strlen(filename), FL_PATH_MAX - strlen(filename),
           "/%s/%s.prefs", vendor, application);

  return filename;
}

Fl_Cocoa_Window_Driver::~Fl_Cocoa_Window_Driver()
{
  if (shape_data_) {
    if (shape_data_->mask) {
      CGImageRelease(shape_data_->mask);
    }
    delete shape_data_;
  }
  [icon_image release];
}

static NSImage* rgb_to_nsimage(const Fl_RGB_Image *rgb) {
  if (!rgb) return nil;
  int ld = rgb->ld();
  if (!ld) ld = rgb->data_w() * rgb->d();
  NSImage *win_icon = nil;
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
  if (fl_mac_os_version >= 101000) {
    NSBitmapImageRep *bitmap =
    [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
                                            pixelsWide:rgb->data_w()
                                            pixelsHigh:rgb->data_h()
                                         bitsPerSample:8
                                       samplesPerPixel:rgb->d()
                                              hasAlpha:!(rgb->d() & 1)
                                              isPlanar:NO
                                        colorSpaceName:(rgb->d() <= 2 ? NSDeviceWhiteColorSpace :
                                                        NSDeviceRGBColorSpace)
                                          bitmapFormat:NSBitmapFormatAlphaNonpremultiplied
                                           bytesPerRow:ld
                                          bitsPerPixel:rgb->d() * 8]; // 10.4
    memcpy([bitmap bitmapData], rgb->array, rgb->data_h() * ld);
    win_icon = [[NSImage alloc] initWithSize:NSMakeSize(0, 0)];
    [win_icon addRepresentation:bitmap];
    [bitmap release];
  }
#endif
  return win_icon;
}

void Fl_Cocoa_Window_Driver::icons(const Fl_RGB_Image *icons[], int count) {
  [icon_image release];
  icon_image = nil;
  if (count >= 1 && pWindow->border() && pWindow->label() && strlen(pWindow->label())) {
    ((Fl_RGB_Image*)icons[0])->normalize();
    icon_image = rgb_to_nsimage(icons[0]);
  }
}

void Fl_Cocoa_Screen_Driver::default_icons(const Fl_RGB_Image *icons[], int count) {
  [default_icon release];
  default_icon = nil;
  if (count >= 1) {
    default_icon = rgb_to_nsimage(icons[0]);
  }
}


fl_uintptr_t Fl_Cocoa_Window_Driver::os_id() {
  return [fl_xid(pWindow) windowNumber];
}


// Deprecated in 1.4 - only for backward compatibility with 1.3
void Fl::insertion_point_location(int x, int y, int height) {
  Fl_Cocoa_Screen_Driver::insertion_point_location(x, y, height);
}
// Deprecated in 1.4 - only for backward compatibility with 1.3
void Fl::reset_marked_text() {
  Fl_Cocoa_Screen_Driver::reset_marked_text();
}
