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mainwindow.h Example File
widgets/icons/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QIcon>
 #include <QList>
 #include <QMainWindow>
 #include <QPixmap>

 class QAction;
 class QActionGroup;
 class QGroupBox;
 class QMenu;
 class QRadioButton;
 class QTableWidget;

 class IconPreviewArea;
 class IconSizeSpinBox;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

 private slots:
     void about();
     void changeStyle(bool checked);
     void changeSize(bool checked = true);
     void changeIcon();
     void addImages();
     void removeAllImages();

 private:
     void createPreviewGroupBox();
     void createImagesGroupBox();
     void createIconSizeGroupBox();
     void createActions();
     void createMenus();
     void createContextMenu();
     void checkCurrentStyle();

     QWidget *centralWidget;

     QGroupBox *previewGroupBox;
     IconPreviewArea *previewArea;

     QGroupBox *imagesGroupBox;
     QTableWidget *imagesTable;

     QGroupBox *iconSizeGroupBox;
     QRadioButton *smallRadioButton;
     QRadioButton *largeRadioButton;
     QRadioButton *toolBarRadioButton;
     QRadioButton *listViewRadioButton;
     QRadioButton *iconViewRadioButton;
     QRadioButton *tabBarRadioButton;
     QRadioButton *otherRadioButton;
     IconSizeSpinBox *otherSpinBox;

     QMenu *fileMenu;
     QMenu *viewMenu;
     QMenu *helpMenu;
     QAction *addImagesAct;
     QAction *removeAllImagesAct;
     QAction *exitAct;
     QAction *guessModeStateAct;
     QActionGroup *styleActionGroup;
     QAction *aboutAct;
     QAction *aboutQtAct;
 };

 #endif