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mainwindow.h Example File
widgets/tablet/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>

 class QAction;
 class QActionGroup;
 class QMenu;
 class QStatusBar;

 class TabletCanvas;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow(TabletCanvas *canvas);

 private slots:
     void brushColorAct();
     void alphaActionTriggered(QAction *action);
     void lineWidthActionTriggered(QAction *action);
     void saturationActionTriggered(QAction *action);
     void saveAct();
     void loadAct();
     void aboutAct();

 private:
     void createActions();
     void createMenus();

     TabletCanvas *myCanvas;

     QAction *brushColorAction;
     QActionGroup *brushActionGroup;

     QActionGroup *alphaChannelGroup;
     QAction *alphaChannelPressureAction;
     QAction *alphaChannelTiltAction;
     QAction *noAlphaChannelAction;

     QActionGroup *colorSaturationGroup;
     QAction *colorSaturationVTiltAction;
     QAction *colorSaturationHTiltAction;
     QAction *colorSaturationPressureAction;
     QAction *noColorSaturationAction;

     QActionGroup *lineWidthGroup;
     QAction *lineWidthPressureAction;
     QAction *lineWidthTiltAction;
     QAction *lineWidthFixedAction;

     QAction *exitAction;
     QAction *saveAction;
     QAction *loadAction;

     QAction *aboutAction;
     QAction *aboutQtAction;

     QMenu *fileMenu;
     QMenu *brushMenu;
     QMenu *tabletMenu;
     QMenu *helpMenu;
     QMenu *colorSaturationMenu;
     QMenu *lineWidthMenu;
     QMenu *alphaChannelMenu;
 };

 #endif