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# colorswatch.cpp Example File
demos/mainwindow/colorswatch.cpp

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     **
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     #include "colorswatch.h"

     #include <QAction>
     #include <QtEvents>
     #include <QFrame>
     #include <QMainWindow>
     #include <QMenu>
     #include <QPainter>
     #include <QImage>
     #include <QColor>
     #include <QDialog>
     #include <QGridLayout>
     #include <QSpinBox>
     #include <QLabel>
     #include <QPainterPath>
     #include <QPushButton>
     #include <QHBoxLayout>
     #include <QtDebug>

     #undef DEBUG_SIZEHINTS

     QColor bgColorForName(const QString &name)
     {
         if (name == "Black")
             return QColor("#D8D8D8");
         else if (name == "White")
             return QColor("#F1F1F1");
         else if (name == "Red")
             return QColor("#F1D8D8");
         else if (name == "Green")
             return QColor("#D8E4D8");
         else if (name == "Blue")
             return QColor("#D8D8F1");
         else if (name == "Yellow")
             return QColor("#F1F0D8");
         return QColor(name).light(110);
     }

     QColor fgColorForName(const QString &name)
     {
         if (name == "Black")
             return QColor("#6C6C6C");
         else if (name == "White")
             return QColor("#F8F8F8");
         else if (name == "Red")
             return QColor("#F86C6C");
         else if (name == "Green")
             return QColor("#6CB26C");
         else if (name == "Blue")
             return QColor("#6C6CF8");
         else if (name == "Yellow")
             return QColor("#F8F76C");
         return QColor(name);
     }

     class ColorDock : public QFrame
     {
         Q_OBJECT
     public:
         ColorDock(const QString &c, QWidget *parent);

         virtual QSize sizeHint() const;
         virtual QSize minimumSizeHint() const;

         void setCustomSizeHint(const QSize &size);

     public slots:
         void changeSizeHints();

     protected:
         void paintEvent(QPaintEvent *);
         QString color;
         QSize szHint, minSzHint;
     };

     ColorDock::ColorDock(const QString &c, QWidget *parent)
         : QFrame(parent) , color(c)
     {
         QFont font = this->font();
         font.setPointSize(8);
         setFont(font);
         szHint = QSize(-1, -1);
         minSzHint = QSize(125, 75);
     }

     QSize ColorDock::sizeHint() const
     {
         return szHint;
     }

     QSize ColorDock::minimumSizeHint() const
     {
         return minSzHint;
     }

     void ColorDock::paintEvent(QPaintEvent *)
     {
         QPainter p(this);
         p.setRenderHint(QPainter::Antialiasing);
         p.fillRect(rect(), bgColorForName(color));

         p.save();

         extern void render_qt_text(QPainter *, int, int, const QColor &);
         render_qt_text(&p, width(), height(), fgColorForName(color));

         p.restore();

     #ifdef DEBUG_SIZEHINTS
         p.setRenderHint(QPainter::Antialiasing, false);

         QSize sz = size();
         QSize szHint = sizeHint();
         QSize minSzHint = minimumSizeHint();
         QSize maxSz = maximumSize();
         QString text = QString::fromLatin1("sz: %1x%2\nszHint: %3x%4\nminSzHint: %5x%6\n"
                                             "maxSz: %8x%9")
                         .arg(sz.width()).arg(sz.height())
                         .arg(szHint.width()).arg(szHint.height())
                         .arg(minSzHint.width()).arg(minSzHint.height())
                         .arg(maxSz.width()).arg(maxSz.height());

         QRect r = fontMetrics().boundingRect(rect(), Qt::AlignLeft|Qt::AlignTop, text);
         r.adjust(-2, -2, 1, 1);
         p.translate(4, 4);
         QColor bg = Qt::yellow;
         bg.setAlpha(120);
         p.setBrush(bg);
         p.setPen(Qt::black);
         p.drawRect(r);
         p.drawText(rect(), Qt::AlignLeft|Qt::AlignTop, text);
     #endif // DEBUG_SIZEHINTS
     }

     static QSpinBox *createSpinBox(int value, QWidget *parent, int max = 1000)
     {
         QSpinBox *result = new QSpinBox(parent);
         result->setMinimum(-1);
         result->setMaximum(max);
         result->setValue(value);
         return result;
     }

     void ColorDock::changeSizeHints()
     {
         QDialog dialog(this);
         dialog.setWindowTitle(color);

         QVBoxLayout *topLayout = new QVBoxLayout(&dialog);

         QGridLayout *inputLayout = new QGridLayout();
         topLayout->addLayout(inputLayout);

         inputLayout->addWidget(new QLabel(tr("Size Hint:"), &dialog), 0, 0);
         inputLayout->addWidget(new QLabel(tr("Min Size Hint:"), &dialog), 1, 0);
         inputLayout->addWidget(new QLabel(tr("Max Size:"), &dialog), 2, 0);
         inputLayout->addWidget(new QLabel(tr("Dockwgt Max Size:"), &dialog), 3, 0);

         QSpinBox *szHintW = createSpinBox(szHint.width(), &dialog);
         inputLayout->addWidget(szHintW, 0, 1);
         QSpinBox *szHintH = createSpinBox(szHint.height(), &dialog);
         inputLayout->addWidget(szHintH, 0, 2);

         QSpinBox *minSzHintW = createSpinBox(minSzHint.width(), &dialog);
         inputLayout->addWidget(minSzHintW, 1, 1);
         QSpinBox *minSzHintH = createSpinBox(minSzHint.height(), &dialog);
         inputLayout->addWidget(minSzHintH, 1, 2);

         QSize maxSz = maximumSize();
         QSpinBox *maxSzW = createSpinBox(maxSz.width(), &dialog, QWIDGETSIZE_MAX);
         inputLayout->addWidget(maxSzW, 2, 1);
         QSpinBox *maxSzH = createSpinBox(maxSz.height(), &dialog, QWIDGETSIZE_MAX);
         inputLayout->addWidget(maxSzH, 2, 2);

         QSize dwMaxSz = parentWidget()->maximumSize();
         QSpinBox *dwMaxSzW = createSpinBox(dwMaxSz.width(), &dialog, QWIDGETSIZE_MAX);
         inputLayout->addWidget(dwMaxSzW, 3, 1);
         QSpinBox *dwMaxSzH = createSpinBox(dwMaxSz.height(), &dialog, QWIDGETSIZE_MAX);
         inputLayout->addWidget(dwMaxSzH, 3, 2);

         inputLayout->setColumnStretch(1, 1);
         inputLayout->setColumnStretch(2, 1);

         topLayout->addStretch();

         QHBoxLayout *buttonBox = new QHBoxLayout();
         topLayout->addLayout(buttonBox);

         QPushButton *okButton = new QPushButton(tr("Ok"), &dialog);
         QPushButton *cancelButton = new QPushButton(tr("Cancel"), &dialog);
         connect(okButton, SIGNAL(clicked()), &dialog, SLOT(accept()));
         connect(cancelButton, SIGNAL(clicked()), &dialog, SLOT(reject()));
         buttonBox->addStretch();
         buttonBox->addWidget(cancelButton);
         buttonBox->addWidget(okButton);

         if (!dialog.exec())
             return;

         szHint = QSize(szHintW->value(), szHintH->value());
         minSzHint = QSize(minSzHintW->value(), minSzHintH->value());
         maxSz = QSize(maxSzW->value(), maxSzH->value());
         setMaximumSize(maxSz);
         dwMaxSz = QSize(dwMaxSzW->value(), dwMaxSzH->value());
         parentWidget()->setMaximumSize(dwMaxSz);
         updateGeometry();
         update();
     }

     void ColorDock::setCustomSizeHint(const QSize &size)
     {
         szHint = size;
         updateGeometry();
     }

     ColorSwatch::ColorSwatch(const QString &colorName, QWidget *parent, Qt::WindowFlags flags)
         : QDockWidget(parent, flags)
     {
         setObjectName(colorName + QLatin1String(" Dock Widget"));
         setWindowTitle(objectName() + QLatin1String(" [*]"));

         QFrame *swatch = new ColorDock(colorName, this);
         swatch->setFrameStyle(QFrame::Box | QFrame::Sunken);

         setWidget(swatch);

         changeSizeHintsAction = new QAction(tr("Change Size Hints"), this);
         connect(changeSizeHintsAction, SIGNAL(triggered()), swatch, SLOT(changeSizeHints()));

         closableAction = new QAction(tr("Closable"), this);
         closableAction->setCheckable(true);
         connect(closableAction, SIGNAL(triggered(bool)), SLOT(changeClosable(bool)));

         movableAction = new QAction(tr("Movable"), this);
         movableAction->setCheckable(true);
         connect(movableAction, SIGNAL(triggered(bool)), SLOT(changeMovable(bool)));

         floatableAction = new QAction(tr("Floatable"), this);
         floatableAction->setCheckable(true);
         connect(floatableAction, SIGNAL(triggered(bool)), SLOT(changeFloatable(bool)));

         verticalTitleBarAction = new QAction(tr("Vertical title bar"), this);
         verticalTitleBarAction->setCheckable(true);
         connect(verticalTitleBarAction, SIGNAL(triggered(bool)),
                 SLOT(changeVerticalTitleBar(bool)));

         floatingAction = new QAction(tr("Floating"), this);
         floatingAction->setCheckable(true);
         connect(floatingAction, SIGNAL(triggered(bool)), SLOT(changeFloating(bool)));

         allowedAreasActions = new QActionGroup(this);
         allowedAreasActions->setExclusive(false);

         allowLeftAction = new QAction(tr("Allow on Left"), this);
         allowLeftAction->setCheckable(true);
         connect(allowLeftAction, SIGNAL(triggered(bool)), SLOT(allowLeft(bool)));

         allowRightAction = new QAction(tr("Allow on Right"), this);
         allowRightAction->setCheckable(true);
         connect(allowRightAction, SIGNAL(triggered(bool)), SLOT(allowRight(bool)));

         allowTopAction = new QAction(tr("Allow on Top"), this);
         allowTopAction->setCheckable(true);
         connect(allowTopAction, SIGNAL(triggered(bool)), SLOT(allowTop(bool)));

         allowBottomAction = new QAction(tr("Allow on Bottom"), this);
         allowBottomAction->setCheckable(true);
         connect(allowBottomAction, SIGNAL(triggered(bool)), SLOT(allowBottom(bool)));

         allowedAreasActions->addAction(allowLeftAction);
         allowedAreasActions->addAction(allowRightAction);
         allowedAreasActions->addAction(allowTopAction);
         allowedAreasActions->addAction(allowBottomAction);

         areaActions = new QActionGroup(this);
         areaActions->setExclusive(true);

         leftAction = new QAction(tr("Place on Left") , this);
         leftAction->setCheckable(true);
         connect(leftAction, SIGNAL(triggered(bool)), SLOT(placeLeft(bool)));

         rightAction = new QAction(tr("Place on Right") , this);
         rightAction->setCheckable(true);
         connect(rightAction, SIGNAL(triggered(bool)), SLOT(placeRight(bool)));

         topAction = new QAction(tr("Place on Top") , this);
         topAction->setCheckable(true);
         connect(topAction, SIGNAL(triggered(bool)), SLOT(placeTop(bool)));

         bottomAction = new QAction(tr("Place on Bottom") , this);
         bottomAction->setCheckable(true);
         connect(bottomAction, SIGNAL(triggered(bool)), SLOT(placeBottom(bool)));

         areaActions->addAction(leftAction);
         areaActions->addAction(rightAction);
         areaActions->addAction(topAction);
         areaActions->addAction(bottomAction);

         connect(movableAction, SIGNAL(triggered(bool)), areaActions, SLOT(setEnabled(bool)));

         connect(movableAction, SIGNAL(triggered(bool)), allowedAreasActions, SLOT(setEnabled(bool)));

         connect(floatableAction, SIGNAL(triggered(bool)), floatingAction, SLOT(setEnabled(bool)));

         connect(floatingAction, SIGNAL(triggered(bool)), floatableAction, SLOT(setDisabled(bool)));
         connect(movableAction, SIGNAL(triggered(bool)), floatableAction, SLOT(setEnabled(bool)));

         tabMenu = new QMenu(this);
         tabMenu->setTitle(tr("Tab into"));
         connect(tabMenu, SIGNAL(triggered(QAction*)), this, SLOT(tabInto(QAction*)));

         splitHMenu = new QMenu(this);
         splitHMenu->setTitle(tr("Split horizontally into"));
         connect(splitHMenu, SIGNAL(triggered(QAction*)), this, SLOT(splitInto(QAction*)));

         splitVMenu = new QMenu(this);
         splitVMenu->setTitle(tr("Split vertically into"));
         connect(splitVMenu, SIGNAL(triggered(QAction*)), this, SLOT(splitInto(QAction*)));

         windowModifiedAction = new QAction(tr("Modified"), this);
         windowModifiedAction->setCheckable(true);
         windowModifiedAction->setChecked(false);
         connect(windowModifiedAction, SIGNAL(toggled(bool)), this, SLOT(setWindowModified(bool)));

         menu = new QMenu(colorName, this);
         menu->addAction(toggleViewAction());
         QAction *action = menu->addAction(tr("Raise"));
         connect(action, SIGNAL(triggered()), this, SLOT(raise()));
         menu->addAction(changeSizeHintsAction);
         menu->addSeparator();
         menu->addAction(closableAction);
         menu->addAction(movableAction);
         menu->addAction(floatableAction);
         menu->addAction(floatingAction);
         menu->addAction(verticalTitleBarAction);
         menu->addSeparator();
         menu->addActions(allowedAreasActions->actions());
         menu->addSeparator();
         menu->addActions(areaActions->actions());
         menu->addSeparator();
         menu->addMenu(splitHMenu);
         menu->addMenu(splitVMenu);
         menu->addMenu(tabMenu);
         menu->addSeparator();
         menu->addAction(windowModifiedAction);

         connect(menu, SIGNAL(aboutToShow()), this, SLOT(updateContextMenu()));

         if(colorName == "Black") {
             leftAction->setShortcut(Qt::CTRL|Qt::Key_W);
             rightAction->setShortcut(Qt::CTRL|Qt::Key_E);
             toggleViewAction()->setShortcut(Qt::CTRL|Qt::Key_R);
         }
     }

     void ColorSwatch::updateContextMenu()
     {
         QMainWindow *mainWindow = qobject_cast<QMainWindow *>(parentWidget());
         const Qt::DockWidgetArea area = mainWindow->dockWidgetArea(this);
         const Qt::DockWidgetAreas areas = allowedAreas();

         closableAction->setChecked(features() & QDockWidget::DockWidgetClosable);
         if (windowType() == Qt::Drawer) {
             floatableAction->setEnabled(false);
             floatingAction->setEnabled(false);
             movableAction->setEnabled(false);
             verticalTitleBarAction->setChecked(false);
         } else {
             floatableAction->setChecked(features() & QDockWidget::DockWidgetFloatable);
             floatingAction->setChecked(isWindow());
             // done after floating, to get 'floatable' correctly initialized
             movableAction->setChecked(features() & QDockWidget::DockWidgetMovable);
             verticalTitleBarAction
                 ->setChecked(features() & QDockWidget::DockWidgetVerticalTitleBar);
         }

         allowLeftAction->setChecked(isAreaAllowed(Qt::LeftDockWidgetArea));
         allowRightAction->setChecked(isAreaAllowed(Qt::RightDockWidgetArea));
         allowTopAction->setChecked(isAreaAllowed(Qt::TopDockWidgetArea));
         allowBottomAction->setChecked(isAreaAllowed(Qt::BottomDockWidgetArea));

         if (allowedAreasActions->isEnabled()) {
             allowLeftAction->setEnabled(area != Qt::LeftDockWidgetArea);
             allowRightAction->setEnabled(area != Qt::RightDockWidgetArea);
             allowTopAction->setEnabled(area != Qt::TopDockWidgetArea);
             allowBottomAction->setEnabled(area != Qt::BottomDockWidgetArea);
         }

         leftAction->blockSignals(true);
         rightAction->blockSignals(true);
         topAction->blockSignals(true);
         bottomAction->blockSignals(true);

         leftAction->setChecked(area == Qt::LeftDockWidgetArea);
         rightAction->setChecked(area == Qt::RightDockWidgetArea);
         topAction->setChecked(area == Qt::TopDockWidgetArea);
         bottomAction->setChecked(area == Qt::BottomDockWidgetArea);

         leftAction->blockSignals(false);
         rightAction->blockSignals(false);
         topAction->blockSignals(false);
         bottomAction->blockSignals(false);

         if (areaActions->isEnabled()) {
             leftAction->setEnabled(areas & Qt::LeftDockWidgetArea);
             rightAction->setEnabled(areas & Qt::RightDockWidgetArea);
             topAction->setEnabled(areas & Qt::TopDockWidgetArea);
             bottomAction->setEnabled(areas & Qt::BottomDockWidgetArea);
         }

         tabMenu->clear();
         splitHMenu->clear();
         splitVMenu->clear();
         QList<ColorSwatch*> dock_list = qFindChildren<ColorSwatch*>(mainWindow);
         foreach (ColorSwatch *dock, dock_list) {
     //        if (!dock->isVisible() || dock->isFloating())
     //            continue;
             tabMenu->addAction(dock->objectName());
             splitHMenu->addAction(dock->objectName());
             splitVMenu->addAction(dock->objectName());
         }
     }

     void ColorSwatch::splitInto(QAction *action)
     {
         QMainWindow *mainWindow = qobject_cast<QMainWindow *>(parentWidget());
         QList<ColorSwatch*> dock_list = qFindChildren<ColorSwatch*>(mainWindow);
         ColorSwatch *target = 0;
         foreach (ColorSwatch *dock, dock_list) {
             if (action->text() == dock->objectName()) {
                 target = dock;
                 break;
             }
         }
         if (target == 0)
             return;

         Qt::Orientation o = action->parent() == splitHMenu
                             ? Qt::Horizontal : Qt::Vertical;
         mainWindow->splitDockWidget(target, this, o);
     }

     void ColorSwatch::tabInto(QAction *action)
     {
         QMainWindow *mainWindow = qobject_cast<QMainWindow *>(parentWidget());
         QList<ColorSwatch*> dock_list = qFindChildren<ColorSwatch*>(mainWindow);
         ColorSwatch *target = 0;
         foreach (ColorSwatch *dock, dock_list) {
             if (action->text() == dock->objectName()) {
                 target = dock;
                 break;
             }
         }
         if (target == 0)
             return;

         mainWindow->tabifyDockWidget(target, this);
     }

     void ColorSwatch::contextMenuEvent(QContextMenuEvent *event)
     {
         event->accept();
         menu->exec(event->globalPos());
     }

     void ColorSwatch::allow(Qt::DockWidgetArea area, bool a)
     {
         Qt::DockWidgetAreas areas = allowedAreas();
         areas = a ? areas | area : areas & ~area;
         setAllowedAreas(areas);

         if (areaActions->isEnabled()) {
             leftAction->setEnabled(areas & Qt::LeftDockWidgetArea);
             rightAction->setEnabled(areas & Qt::RightDockWidgetArea);
             topAction->setEnabled(areas & Qt::TopDockWidgetArea);
             bottomAction->setEnabled(areas & Qt::BottomDockWidgetArea);
         }
     }

     void ColorSwatch::place(Qt::DockWidgetArea area, bool p)
     {
         if (!p) return;

         QMainWindow *mainWindow = qobject_cast<QMainWindow *>(parentWidget());
         mainWindow->addDockWidget(area, this);

         if (allowedAreasActions->isEnabled()) {
             allowLeftAction->setEnabled(area != Qt::LeftDockWidgetArea);
             allowRightAction->setEnabled(area != Qt::RightDockWidgetArea);
             allowTopAction->setEnabled(area != Qt::TopDockWidgetArea);
             allowBottomAction->setEnabled(area != Qt::BottomDockWidgetArea);
         }
     }

     void ColorSwatch::setCustomSizeHint(const QSize &size)
     {
         if (ColorDock *dock = qobject_cast<ColorDock*>(widget()))
             dock->setCustomSizeHint(size);
     }

     void ColorSwatch::changeClosable(bool on)
     { setFeatures(on ? features() | DockWidgetClosable : features() & ~DockWidgetClosable); }

     void ColorSwatch::changeMovable(bool on)
     { setFeatures(on ? features() | DockWidgetMovable : features() & ~DockWidgetMovable); }

     void ColorSwatch::changeFloatable(bool on)
     { setFeatures(on ? features() | DockWidgetFloatable : features() & ~DockWidgetFloatable); }

     void ColorSwatch::changeFloating(bool floating)
     { setFloating(floating); }

     void ColorSwatch::allowLeft(bool a)
     { allow(Qt::LeftDockWidgetArea, a); }

     void ColorSwatch::allowRight(bool a)
     { allow(Qt::RightDockWidgetArea, a); }

     void ColorSwatch::allowTop(bool a)
     { allow(Qt::TopDockWidgetArea, a); }

     void ColorSwatch::allowBottom(bool a)
     { allow(Qt::BottomDockWidgetArea, a); }

     void ColorSwatch::placeLeft(bool p)
     { place(Qt::LeftDockWidgetArea, p); }

     void ColorSwatch::placeRight(bool p)
     { place(Qt::RightDockWidgetArea, p); }

     void ColorSwatch::placeTop(bool p)
     { place(Qt::TopDockWidgetArea, p); }

     void ColorSwatch::placeBottom(bool p)
     { place(Qt::BottomDockWidgetArea, p); }

     void ColorSwatch::changeVerticalTitleBar(bool on)
     {
         setFeatures(on ? features() | DockWidgetVerticalTitleBar
                         : features() & ~DockWidgetVerticalTitleBar);
     }

     #include "colorswatch.moc"