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# mainwindow.h Example File
graphicsview/diagramscene/mainwindow.h

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     #ifndef MAINWINDOW_H
     #define MAINWINDOW_H

     #include <QMainWindow>

     #include "diagramitem.h"

     class QAction;
     class QToolBox;
     class QSpinBox;
     class QComboBox;
     class QFontComboBox;
     class QButtonGroup;
     class DiagramScene;
     class QLineEdit;
     class QGraphicsTextItem;
     class QFont;
     class QToolButton;
     class QAbstractButton;
     class QGraphicsView;

     class MainWindow : public QMainWindow
     {
         Q_OBJECT

     public:
        MainWindow();

     private slots:
         void backgroundButtonGroupClicked(QAbstractButton *button);
         void buttonGroupClicked(int id);
         void deleteItem();
         void pointerGroupClicked(int id);
         void bringToFront();
         void sendToBack();
         void itemInserted(DiagramItem *item);
         void textInserted(QGraphicsTextItem *item);
         void currentFontChanged(const QFont &font);
         void fontSizeChanged(const QString &size);
         void sceneScaleChanged(const QString &scale);
         void textColorChanged();
         void itemColorChanged();
         void lineColorChanged();
         void textButtonTriggered();
         void fillButtonTriggered();
         void lineButtonTriggered();
         void handleFontChange();
         void itemSelected(QGraphicsItem *item);
         void about();

     private:
         void createToolBox();
         void createActions();
         void createMenus();
         void createToolbars();
         QWidget *createBackgroundCellWidget(const QString &text,
                                             const QString &image);
         QWidget *createCellWidget(const QString &text,
                                   DiagramItem::DiagramType type);
         QMenu *createColorMenu(const char *slot, QColor defaultColor);
         QIcon createColorToolButtonIcon(const QString &image, QColor color);
         QIcon createColorIcon(QColor color);

         DiagramScene *scene;
         QGraphicsView *view;

         QAction *exitAction;
         QAction *addAction;
         QAction *deleteAction;

         QAction *toFrontAction;
         QAction *sendBackAction;
         QAction *aboutAction;

         QMenu *fileMenu;
         QMenu *itemMenu;
         QMenu *aboutMenu;

         QToolBar *textToolBar;
         QToolBar *editToolBar;
         QToolBar *colorToolBar;
         QToolBar *pointerToolbar;

         QComboBox *sceneScaleCombo;
         QComboBox *itemColorCombo;
         QComboBox *textColorCombo;
         QComboBox *fontSizeCombo;
         QFontComboBox *fontCombo;

         QToolBox *toolBox;
         QButtonGroup *buttonGroup;
         QButtonGroup *pointerTypeGroup;
         QButtonGroup *backgroundButtonGroup;
         QToolButton *fontColorToolButton;
         QToolButton *fillColorToolButton;
         QToolButton *lineColorToolButton;
         QAction *boldAction;
         QAction *underlineAction;
         QAction *italicAction;
         QAction *textAction;
         QAction *fillAction;
         QAction *lineAction;
     };

     #endif