mainwindow.cpp Example File
widgets/tablet/mainwindow.cpp

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 #include <QtGui>

 #include "mainwindow.h"
 #include "tabletcanvas.h"

 MainWindow::MainWindow(TabletCanvas *canvas)
 {
     myCanvas = canvas;
     createActions();
     createMenus();

     myCanvas->setColor(Qt::red);
     myCanvas->setLineWidthType(TabletCanvas::LineWidthPressure);
     myCanvas->setAlphaChannelType(TabletCanvas::NoAlpha);
     myCanvas->setColorSaturationType(TabletCanvas::NoSaturation);

     setWindowTitle(tr("Tablet Example"));
     setCentralWidget(myCanvas);
 }

 void MainWindow::brushColorAct()
 {
     QColor color = QColorDialog::getColor(myCanvas->color());

     if (color.isValid())
         myCanvas->setColor(color);
 }

 void MainWindow::alphaActionTriggered(QAction *action)
 {
     if (action == alphaChannelPressureAction) {
         myCanvas->setAlphaChannelType(TabletCanvas::AlphaPressure);
     } else if (action == alphaChannelTiltAction) {
         myCanvas->setAlphaChannelType(TabletCanvas::AlphaTilt);
     } else {
         myCanvas->setAlphaChannelType(TabletCanvas::NoAlpha);
     }
 }

 void MainWindow::lineWidthActionTriggered(QAction *action)
 {
     if (action == lineWidthPressureAction) {
         myCanvas->setLineWidthType(TabletCanvas::LineWidthPressure);
     } else if (action == lineWidthTiltAction) {
         myCanvas->setLineWidthType(TabletCanvas::LineWidthTilt);
     } else {
         myCanvas->setLineWidthType(TabletCanvas::NoLineWidth);
     }
 }

 void MainWindow::saturationActionTriggered(QAction *action)
 {
     if (action == colorSaturationVTiltAction) {
         myCanvas->setColorSaturationType(TabletCanvas::SaturationVTilt);
     } else if (action == colorSaturationHTiltAction) {
         myCanvas->setColorSaturationType(TabletCanvas::SaturationHTilt);
     } else if (action == colorSaturationPressureAction) {
         myCanvas->setColorSaturationType(TabletCanvas::SaturationPressure);
     } else {
         myCanvas->setColorSaturationType(TabletCanvas::NoSaturation);
     }
 }

 void MainWindow::saveAct()
 {
     QString path = QDir::currentPath() + "/untitled.png";
     QString fileName = QFileDialog::getSaveFileName(this, tr("Save Picture"),
                              path);

     if (!myCanvas->saveImage(fileName))
         QMessageBox::information(this, "Error Saving Picture",
                                  "Could not save the image");
 }

 void MainWindow::loadAct()
 {
     QString fileName = QFileDialog::getOpenFileName(this, tr("Open Picture"),
                                                     QDir::currentPath());

     if (!myCanvas->loadImage(fileName))
         QMessageBox::information(this, "Error Opening Picture",
                                  "Could not open picture");
 }

 void MainWindow::aboutAct()
 {
     QMessageBox::about(this, tr("About Tablet Example"),
                        tr("This example shows use of a Wacom tablet in Qt"));
 }

 void MainWindow::createActions()
 {
     brushColorAction = new QAction(tr("&Brush Color..."), this);
     brushColorAction->setShortcut(tr("Ctrl+C"));
     connect(brushColorAction, SIGNAL(triggered()),
             this, SLOT(brushColorAct()));

     alphaChannelPressureAction = new QAction(tr("&Pressure"), this);
     alphaChannelPressureAction->setCheckable(true);

     alphaChannelTiltAction = new QAction(tr("&Tilt"), this);
     alphaChannelTiltAction->setCheckable(true);

     noAlphaChannelAction = new QAction(tr("No Alpha Channel"), this);
     noAlphaChannelAction->setCheckable(true);
     noAlphaChannelAction->setChecked(true);

     alphaChannelGroup = new QActionGroup(this);
     alphaChannelGroup->addAction(alphaChannelPressureAction);
     alphaChannelGroup->addAction(alphaChannelTiltAction);
     alphaChannelGroup->addAction(noAlphaChannelAction);
     connect(alphaChannelGroup, SIGNAL(triggered(QAction*)),
             this, SLOT(alphaActionTriggered(QAction*)));

     colorSaturationVTiltAction = new QAction(tr("&Vertical Tilt"), this);
     colorSaturationVTiltAction->setCheckable(true);

     colorSaturationHTiltAction = new QAction(tr("&Horizontal Tilt"), this);
     colorSaturationHTiltAction->setCheckable(true);

     colorSaturationPressureAction = new QAction(tr("&Pressure"), this);
     colorSaturationPressureAction->setCheckable(true);

     noColorSaturationAction = new QAction(tr("&No Color Saturation"), this);
     noColorSaturationAction->setCheckable(true);
     noColorSaturationAction->setChecked(true);

     colorSaturationGroup = new QActionGroup(this);
     colorSaturationGroup->addAction(colorSaturationVTiltAction);
     colorSaturationGroup->addAction(colorSaturationHTiltAction);
     colorSaturationGroup->addAction(colorSaturationPressureAction);
     colorSaturationGroup->addAction(noColorSaturationAction);
     connect(colorSaturationGroup, SIGNAL(triggered(QAction*)),
             this, SLOT(saturationActionTriggered(QAction*)));

     lineWidthPressureAction = new QAction(tr("&Pressure"), this);
     lineWidthPressureAction->setCheckable(true);
     lineWidthPressureAction->setChecked(true);

     lineWidthTiltAction = new QAction(tr("&Tilt"), this);
     lineWidthTiltAction->setCheckable(true);

     lineWidthFixedAction = new QAction(tr("&Fixed"), this);
     lineWidthFixedAction->setCheckable(true);

     lineWidthGroup = new QActionGroup(this);
     lineWidthGroup->addAction(lineWidthPressureAction);
     lineWidthGroup->addAction(lineWidthTiltAction);
     lineWidthGroup->addAction(lineWidthFixedAction);
     connect(lineWidthGroup, SIGNAL(triggered(QAction*)),
             this, SLOT(lineWidthActionTriggered(QAction*)));

     exitAction = new QAction(tr("E&xit"), this);
     exitAction->setShortcuts(QKeySequence::Quit);
     connect(exitAction, SIGNAL(triggered()),
             this, SLOT(close()));

     loadAction = new QAction(tr("&Open..."), this);
     loadAction->setShortcuts(QKeySequence::Open);
     connect(loadAction, SIGNAL(triggered()),
             this, SLOT(loadAct()));

     saveAction = new QAction(tr("&Save As..."), this);
     saveAction->setShortcuts(QKeySequence::SaveAs);
     connect(saveAction, SIGNAL(triggered()),
             this, SLOT(saveAct()));

     aboutAction = new QAction(tr("A&bout"), this);
     aboutAction->setShortcut(tr("Ctrl+B"));
     connect(aboutAction, SIGNAL(triggered()),
             this, SLOT(aboutAct()));

     aboutQtAction = new QAction(tr("About &Qt"), this);
     aboutQtAction->setShortcut(tr("Ctrl+Q"));
     connect(aboutQtAction, SIGNAL(triggered()),
             qApp, SLOT(aboutQt()));
 }

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()->addMenu(tr("&File"));
     fileMenu->addAction(loadAction);
     fileMenu->addAction(saveAction);
     fileMenu->addSeparator();
     fileMenu->addAction(exitAction);

     brushMenu = menuBar()->addMenu(tr("&Brush"));
     brushMenu->addAction(brushColorAction);

     tabletMenu = menuBar()->addMenu(tr("&Tablet"));

     lineWidthMenu = tabletMenu->addMenu(tr("&Line Width"));
     lineWidthMenu->addAction(lineWidthPressureAction);
     lineWidthMenu->addAction(lineWidthTiltAction);
     lineWidthMenu->addAction(lineWidthFixedAction);

     alphaChannelMenu = tabletMenu->addMenu(tr("&Alpha Channel"));
     alphaChannelMenu->addAction(alphaChannelPressureAction);
     alphaChannelMenu->addAction(alphaChannelTiltAction);
     alphaChannelMenu->addAction(noAlphaChannelAction);

     colorSaturationMenu = tabletMenu->addMenu(tr("&Color Saturation"));
     colorSaturationMenu->addAction(colorSaturationVTiltAction);
     colorSaturationMenu->addAction(colorSaturationHTiltAction);
     colorSaturationMenu->addAction(noColorSaturationAction);

     helpMenu = menuBar()->addMenu("&Help");
     helpMenu->addAction(aboutAction);
     helpMenu->addAction(aboutQtAction);
 }