/****************************************************************************
** $Id:  qt/qcursor.cpp   3.0.3   edited Nov 22 20:39 $
**
** Implementation of QCursor class
**
** Created : 940220
**
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** Foundation and appearing in the file LICENSE.GPL included in the
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**********************************************************************/

#include "qcursor.h"

#ifndef QT_NO_CURSOR

#include "qbitmap.h"
#include "qimage.h"
#include "qdatastream.h"


// NOT REVISED
/*!
  \class QCursor qcursor.h

  \brief The QCursor class provides a mouse cursor with an arbitrary shape.

  \ingroup appearance
  \ingroup shared

  This class is mainly used to create mouse cursors that are associated
  with particular widgets and to get and set the position of the mouse
  cursor.

  Qt has a number of standard cursor shapes, but you can also make
  custom cursor shapes based on a QBitmap, a mask and a hotspot.

  To associate a cursor with a widget, use QWidget::setCursor().  To
  associate a cursor with all widgets (normally for a short period of
  time), use QApplication::setOverrideCursor().

  To set a cursor shape use QCursor::setShape() or use the QCursor constructor
  which takes the shape as argument, or you can use one of the predefined cursors
  defined in the \l CursorShape enum.

  If you want to create a cursor with your own bitmap, either use the
  QCursor constructor which takes a bitmap and a mask or the
  constructor which takes a pixmap as arguments.

  To set or get the position of the mouse cursor use the static methods
  QCursor::pos() and QCursor::setPos().

  \img cursors.png Cursor Shapes

  \sa QWidget
  \link guibooks.html#fowler GUI Design Handbook: Cursors\endlink
*/

/*!
  \enum	Qt::CursorShape

  This enum type defines the various cursors that can be used.

  \value ArrowCursor - standard arrow cursor
  \value UpArrowCursor - upwards arrow
  \value CrossCursor - crosshair
  \value WaitCursor - hourglass/watch
  \value IbeamCursor - ibeam/text entry
  \value SizeVerCursor - vertical resize
  \value SizeHorCursor - horizontal resize
  \value SizeBDiagCursor - diagonal resize (/)
  \value SizeFDiagCursor - diagonal resize (\)
  \value SizeAllCursor - all directions resize
  \value BlankCursor - blank/invisible cursor
  \value SplitVCursor - vertical splitting
  \value SplitHCursor - horziontal splitting
  \value PointingHandCursor - a pointing hand
  \value ForbiddenCursor - a slashed circle
  \value WhatsThisCursor - an arrow with a question mark
  \value BitmapCursor

  ArrowCursor is the default for widgets in a normal state.

  \img cursors.png Cursor Shapes
*/

/*****************************************************************************
  QCursor stream functions
 *****************************************************************************/

#ifndef QT_NO_DATASTREAM


/*!
  \relates QCursor
  Writes the cursor \a c to the stream \a s.

  \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

QDataStream &operator<<( QDataStream &s, const QCursor &c )
{
    s << (Q_INT16)c.shape();			// write shape id to stream
    if ( c.shape() == Qt::BitmapCursor ) {		// bitmap cursor
#if !defined(QT_NO_IMAGEIO)
	s << *c.bitmap() << *c.mask();
	s << c.hotSpot();
#else
	qWarning("No Image Cursor I/O");
#endif
    }
    return s;
}

/*!
  \relates QCursor
  Reads a cursor from the stream \a s and sets \a c to the read data.

  \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

QDataStream &operator>>( QDataStream &s, QCursor &c )
{
    Q_INT16 shape;
    s >> shape;					// read shape id from stream
    if ( shape == Qt::BitmapCursor ) {		// read bitmap cursor
#if !defined(QT_NO_IMAGEIO)
	QBitmap bm, bmm;
	QPoint	hot;
	s >> bm >> bmm >> hot;
	c = QCursor( bm, bmm, hot.x(), hot.y() );
#else
	qWarning("No Image Cursor I/O");
#endif
    } else {
	c.setShape( (int)shape );		// create cursor with shape
    }
    return s;
}
#endif // QT_NO_DATASTREAM


/*! Constructs a custom pixmap cursor.

  \a pixmap is the image
	    (usually it should have a mask (set using QPixmap::setMask())
  \a hotX and
  \a hotY define the hot spot of this cursor.

  If \a hotX is negative, it is set to the \c{pixmap().width()/2}.
  If \a hotY is negative, it is set to the \c{pixmap().height()/2}.

  Valid cursor sizes depend on the display hardware (or the underlying
  window system). We recommend using 32x32 cursors, because this size
  is supported on all platforms. Some platforms also support 16x16, 48x48
  and 64x64 cursors.

  Currently, only black-and-white pixmaps can be used.

  \sa QPixmap::QPixmap(), QPixmap::setMask()
*/

QCursor::QCursor( const QPixmap &pixmap, int hotX, int hotY )
{
    QImage img = pixmap.convertToImage().
		    convertDepth( 8, Qt::ThresholdDither|Qt::AvoidDither );
    QBitmap bm;
    bm.convertFromImage( img, Qt::ThresholdDither|Qt::AvoidDither );
    QBitmap bmm;
    if ( bm.mask() ) {
	bmm = *bm.mask();
	QBitmap nullBm;
	bm.setMask( nullBm );
    }
    else if ( pixmap.mask() ) {
	QImage mimg = pixmap.mask()->convertToImage().
	              convertDepth( 8, Qt::ThresholdDither|Qt::AvoidDither );
	bmm.convertFromImage( mimg, Qt::ThresholdDither|Qt::AvoidDither );
    }
    else {
	bmm.resize( bm.size() );
	bmm.fill( Qt::color1 );
    }

    setBitmap(bm,bmm,hotX,hotY);
}



/*!
  Constructs a custom bitmap cursor.

  \a bitmap and
  \a mask make up the bitmap.
  \a hotX and
  \a hotY define the hot spot of this cursor.

  If \a hotX is negative, it is set to the \c{bitmap().width()/2}.
  If \a hotY is negative, it is set to the \c{bitmap().height()/2}.

  The cursor \a bitmap (B) and \a mask (M) bits are combined this way:
  <ol>
  <li> B=1 and M=1 gives black.
  <li> B=0 and M=1 gives white.
  <li> B=0 and M=0 gives transparency.
  <li> B=1 and M=0 gives an undefined result.
  </ol>

  Use the global color \c color0 to draw 0-pixels and \c color1 to draw
  1-pixels in the bitmaps.

  Valid cursor sizes depend on the display hardware (or the underlying
  window system). We recommend using 32x32 cursors, because this size
  is supported on all platforms. Some platforms also support 16x16, 48x48
  and 64x64 cursors.

  \sa QBitmap::QBitmap(), QBitmap::setMask()
*/

QCursor::QCursor( const QBitmap &bitmap, const QBitmap &mask,
		  int hotX, int hotY )
{
    setBitmap(bitmap,mask,hotX,hotY);
}

#endif // QT_NO_CURSOR


