/****************************************************************************
**
** Copyright (C) 2004-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
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** License versions 2.0 or 3.0 as published by the Free Software
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** included in the packaging of this file.  Alternatively you may (at
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** (or its successors, if any) and the KDE Free Qt Foundation. 
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****************************************************************************/

#include "mainwindow.h"
#include "colorswatch.h"
#include "toolbar.h"

#include <QAction>
#include <QLayout>
#include <QMenu>
#include <QMenuBar>
#include <QStatusBar>
#include <QTextEdit>
#include <QFile>
#include <QDataStream>
#include <QFileDialog>
#include <QMessageBox>
#include <QSignalMapper>
#include <QApplication>
#include <QPainter>
#include <QMouseEvent>
#include <qdebug.h>

static const char * const message =
    "<p><b>Qt Main Window Demo</b></p>"

    "<p>This is a demonstration of the QMainWindow, QToolBar and "
    "QDockWidget classes.</p>"

    "<p>The tool bar and dock widgets can be dragged around and rearranged "
    "using the mouse or via the menu.</p>"

    "<p>Each dock widget contains a colored frame and a context "
    "(right-click) menu.</p>"

#ifdef Q_WS_MAC
    "<p>On Mac OS X, the \"Black\" dock widget has been created as a "
    "<em>Drawer</em>, which is a special kind of QDockWidget.</p>"
#endif
    ;

MainWindow::MainWindow(const QMap<QString, QSize> &customSizeHints,
                        QWidget *parent, Qt::WindowFlags flags)
    : QMainWindow(parent, flags)
{
    setObjectName("MainWindow");
    setWindowTitle("Qt Main Window Demo");

    setupToolBar();
    setupMenuBar();
    setupDockWidgets(customSizeHints);

    QTextEdit *center = new QTextEdit(this);
    center->setReadOnly(true);
    center->setHtml(tr(message));
    center->setMinimumSize(400, 205);
    setCentralWidget(center);

    statusBar()->showMessage(tr("Status Bar"));
}

void MainWindow::actionTriggered(QAction *action)
{
    qDebug("action '%s' triggered", action->text().toLocal8Bit().data());
}

void MainWindow::setupToolBar()
{
    for (int i = 0; i < 3; ++i) {
        ToolBar *tb = new ToolBar(QString::fromLatin1("Tool Bar %1").arg(i + 1), this);
        toolBars.append(tb);
        addToolBar(tb);
    }
}

void MainWindow::setupMenuBar()
{
    QMenu *menu = menuBar()->addMenu(tr("&File"));

    QAction *action = menu->addAction(tr("Save layout..."));
    connect(action, SIGNAL(triggered()), this, SLOT(saveLayout()));

    action = menu->addAction(tr("Load layout..."));
    connect(action, SIGNAL(triggered()), this, SLOT(loadLayout()));

    action = menu->addAction(tr("Switch layout direction"));
    connect(action, SIGNAL(triggered()), this, SLOT(switchLayoutDirection()));

    menu->addSeparator();

    menu->addAction(tr("&Quit"), this, SLOT(close()));

    mainWindowMenu = menuBar()->addMenu(tr("Main window"));

    action = mainWindowMenu->addAction(tr("Animated docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & AnimatedDocks);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    action = mainWindowMenu->addAction(tr("Allow nested docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & AllowNestedDocks);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    action = mainWindowMenu->addAction(tr("Allow tabbed docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & AllowTabbedDocks);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    action = mainWindowMenu->addAction(tr("Force tabbed docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & ForceTabbedDocks);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    action = mainWindowMenu->addAction(tr("Vertical tabs"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & VerticalTabs);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    QMenu *toolBarMenu = menuBar()->addMenu(tr("Tool bars"));
    for (int i = 0; i < toolBars.count(); ++i)
        toolBarMenu->addMenu(toolBars.at(i)->menu);

    dockWidgetMenu = menuBar()->addMenu(tr("&Dock Widgets"));
}

void MainWindow::setDockOptions()
{
    DockOptions opts;
    QList<QAction*> actions = mainWindowMenu->actions();

    if (actions.at(0)->isChecked())
        opts |= AnimatedDocks;
    if (actions.at(1)->isChecked())
        opts |= AllowNestedDocks;
    if (actions.at(2)->isChecked())
        opts |= AllowTabbedDocks;
    if (actions.at(3)->isChecked())
        opts |= ForceTabbedDocks;
    if (actions.at(4)->isChecked())
        opts |= VerticalTabs;

    QMainWindow::setDockOptions(opts);
}

void MainWindow::saveLayout()
{
    QString fileName
        = QFileDialog::getSaveFileName(this, tr("Save layout"));
    if (fileName.isEmpty())
        return;
    QFile file(fileName);
    if (!file.open(QFile::WriteOnly)) {
        QString msg = tr("Failed to open %1\n%2")
                        .arg(fileName)
                        .arg(file.errorString());
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }

    QByteArray geo_data = saveGeometry();
    QByteArray layout_data = saveState();

    bool ok = file.putChar((uchar)geo_data.size());
    if (ok)
        ok = file.write(geo_data) == geo_data.size();
    if (ok)
        ok = file.write(layout_data) == layout_data.size();

    if (!ok) {
        QString msg = tr("Error writing to %1\n%2")
                        .arg(fileName)
                        .arg(file.errorString());
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }
}

void MainWindow::loadLayout()
{
    QString fileName
        = QFileDialog::getOpenFileName(this, tr("Load layout"));
    if (fileName.isEmpty())
        return;
    QFile file(fileName);
    if (!file.open(QFile::ReadOnly)) {
        QString msg = tr("Failed to open %1\n%2")
                        .arg(fileName)
                        .arg(file.errorString());
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }

    uchar geo_size;
    QByteArray geo_data;
    QByteArray layout_data;

    bool ok = file.getChar((char*)&geo_size);
    if (ok) {
        geo_data = file.read(geo_size);
        ok = geo_data.size() == geo_size;
    }
    if (ok) {
        layout_data = file.readAll();
        ok = layout_data.size() > 0;
    }

    if (ok)
        ok = restoreGeometry(geo_data);
    if (ok)
        ok = restoreState(layout_data);

    if (!ok) {
        QString msg = tr("Error reading %1")
                        .arg(fileName);
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }
}

QAction *addAction(QMenu *menu, const QString &text, QActionGroup *group, QSignalMapper *mapper,
                    int id)
{
    bool first = group->actions().isEmpty();
    QAction *result = menu->addAction(text);
    result->setCheckable(true);
    result->setChecked(first);
    group->addAction(result);
    QObject::connect(result, SIGNAL(triggered()), mapper, SLOT(map()));
    mapper->setMapping(result, id);
    return result;
}

class BlueTitleBar : public QWidget
{
    Q_OBJECT
public:
    BlueTitleBar(QWidget *parent = 0);

    QSize sizeHint() const { return minimumSizeHint(); }
    QSize minimumSizeHint() const;
protected:
    void paintEvent(QPaintEvent *event);
    void mousePressEvent(QMouseEvent *event);
private:
    QPixmap leftPm, centerPm, rightPm;
};

QSize BlueTitleBar::minimumSizeHint() const
{
    QDockWidget *dw = qobject_cast<QDockWidget*>(parentWidget());
    Q_ASSERT(dw != 0);
    QSize result(leftPm.width() + rightPm.width(), centerPm.height());
    if (dw->features() & QDockWidget::DockWidgetVerticalTitleBar)
        result.transpose();
    return result;
}

BlueTitleBar::BlueTitleBar(QWidget *parent)
    : QWidget(parent)
{
    leftPm = QPixmap(":/res/titlebarLeft.png");
    centerPm = QPixmap(":/res/titlebarCenter.png");
    rightPm = QPixmap(":/res/titlebarRight.png");
}

void BlueTitleBar::paintEvent(QPaintEvent*)
{
    QPainter painter(this);
    QRect rect = this->rect();

    QDockWidget *dw = qobject_cast<QDockWidget*>(parentWidget());
    Q_ASSERT(dw != 0);

    if (dw->features() & QDockWidget::DockWidgetVerticalTitleBar) {
        QSize s = rect.size();
        s.transpose();
        rect.setSize(s);

        painter.translate(rect.left(), rect.top() + rect.width());
        painter.rotate(-90);
        painter.translate(-rect.left(), -rect.top());
    }

    painter.drawPixmap(rect.topLeft(), leftPm);
    painter.drawPixmap(rect.topRight() - QPoint(rightPm.width() - 1, 0), rightPm);
    QBrush brush(centerPm);
    painter.fillRect(rect.left() + leftPm.width(), rect.top(),
                        rect.width() - leftPm.width() - rightPm.width(),
                        centerPm.height(), centerPm);
}

void BlueTitleBar::mousePressEvent(QMouseEvent *event)
{
    QPoint pos = event->pos();

    QRect rect = this->rect();

    QDockWidget *dw = qobject_cast<QDockWidget*>(parentWidget());
    Q_ASSERT(dw != 0);

    if (dw->features() & QDockWidget::DockWidgetVerticalTitleBar) {
        QPoint p = pos;
        pos.setX(rect.left() + rect.bottom() - p.y());
        pos.setY(rect.top() + p.x() - rect.left());

        QSize s = rect.size();
        s.transpose();
        rect.setSize(s);
    }

    const int buttonRight = 7;
    const int buttonWidth = 20;
    int right = rect.right() - pos.x();
    int button = (right - buttonRight)/buttonWidth;
    switch (button) {
        case 0:
            event->accept();
            dw->close();
            break;
        case 1:
            event->accept();
            dw->setFloating(!dw->isFloating());
            break;
        case 2: {
            event->accept();
            QDockWidget::DockWidgetFeatures features = dw->features();
            if (features & QDockWidget::DockWidgetVerticalTitleBar)
                features &= ~QDockWidget::DockWidgetVerticalTitleBar;
            else
                features |= QDockWidget::DockWidgetVerticalTitleBar;
            dw->setFeatures(features);
            break;
        }
        default:
            event->ignore();
            break;
    }
}

void MainWindow::setupDockWidgets(const QMap<QString, QSize> &customSizeHints)
{
    mapper = new QSignalMapper(this);
    connect(mapper, SIGNAL(mapped(int)), this, SLOT(setCorner(int)));

    QMenu *corner_menu = dockWidgetMenu->addMenu(tr("Top left corner"));
    QActionGroup *group = new QActionGroup(this);
    group->setExclusive(true);
    ::addAction(corner_menu, tr("Top dock area"), group, mapper, 0);
    ::addAction(corner_menu, tr("Left dock area"), group, mapper, 1);

    corner_menu = dockWidgetMenu->addMenu(tr("Top right corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    ::addAction(corner_menu, tr("Top dock area"), group, mapper, 2);
    ::addAction(corner_menu, tr("Right dock area"), group, mapper, 3);

    corner_menu = dockWidgetMenu->addMenu(tr("Bottom left corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    ::addAction(corner_menu, tr("Bottom dock area"), group, mapper, 4);
    ::addAction(corner_menu, tr("Left dock area"), group, mapper, 5);

    corner_menu = dockWidgetMenu->addMenu(tr("Bottom right corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    ::addAction(corner_menu, tr("Bottom dock area"), group, mapper, 6);
    ::addAction(corner_menu, tr("Right dock area"), group, mapper, 7);

    dockWidgetMenu->addSeparator();

    static const struct Set {
        const char * name;
        uint flags;
        Qt::DockWidgetArea area;
    } sets [] = {
#ifndef Q_WS_MAC
        { "Black", 0, Qt::LeftDockWidgetArea },
#else
        { "Black", Qt::Drawer, Qt::LeftDockWidgetArea },
#endif
        { "White", 0, Qt::RightDockWidgetArea },
        { "Red", 0, Qt::TopDockWidgetArea },
        { "Green", 0, Qt::TopDockWidgetArea },
        { "Blue", 0, Qt::BottomDockWidgetArea },
        { "Yellow", 0, Qt::BottomDockWidgetArea }
    };
    const int setCount = sizeof(sets) / sizeof(Set);

    for (int i = 0; i < setCount; ++i) {
        ColorSwatch *swatch = new ColorSwatch(tr(sets[i].name), this, Qt::WindowFlags(sets[i].flags));
        if (i%2)
            swatch->setWindowIcon(QIcon(QPixmap(":/res/qt.png")));
        if (qstrcmp(sets[i].name, "Blue") == 0) {
            swatch->setTitleBarWidget(new BlueTitleBar(swatch));
#ifdef Q_WS_QWS
            QPalette pal = palette();
            pal.setBrush(backgroundRole(), QColor(0,0,0,0));
            swatch->setPalette(pal);
#endif
        }

        QString name = QString::fromLatin1(sets[i].name);
        if (customSizeHints.contains(name))
            swatch->setCustomSizeHint(customSizeHints.value(name));

        addDockWidget(sets[i].area, swatch);
        dockWidgetMenu->addMenu(swatch->menu);
    }
}

void MainWindow::setCorner(int id)
{
    switch (id) {
        case 0:
            QMainWindow::setCorner(Qt::TopLeftCorner, Qt::TopDockWidgetArea);
            break;
        case 1:
            QMainWindow::setCorner(Qt::TopLeftCorner, Qt::LeftDockWidgetArea);
            break;
        case 2:
            QMainWindow::setCorner(Qt::TopRightCorner, Qt::TopDockWidgetArea);
            break;
        case 3:
            QMainWindow::setCorner(Qt::TopRightCorner, Qt::RightDockWidgetArea);
            break;
        case 4:
            QMainWindow::setCorner(Qt::BottomLeftCorner, Qt::BottomDockWidgetArea);
            break;
        case 5:
            QMainWindow::setCorner(Qt::BottomLeftCorner, Qt::LeftDockWidgetArea);
            break;
        case 6:
            QMainWindow::setCorner(Qt::BottomRightCorner, Qt::BottomDockWidgetArea);
            break;
        case 7:
            QMainWindow::setCorner(Qt::BottomRightCorner, Qt::RightDockWidgetArea);
            break;
    }
}

void MainWindow::switchLayoutDirection()
{
    if (layoutDirection() == Qt::LeftToRight)
        qApp->setLayoutDirection(Qt::RightToLeft);
    else
        qApp->setLayoutDirection(Qt::LeftToRight);
}

#include "mainwindow.moc"
