MDI Example

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

class MdiChild;
class QAction;
class QMenu;
class QMdiArea;
class QMdiSubWindow;

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow();

    bool openFile(const QString &fileName);

protected:
    void closeEvent(QCloseEvent *event) override;

private slots:
    void newFile();
    void open();
    void save();
    void saveAs();
    void updateRecentFileActions();
    void openRecentFile();
#ifndef QT_NO_CLIPBOARD
    void cut();
    void copy();
    void paste();
#endif
    void about();
    void updateMenus();
    void updateWindowMenu();
    MdiChild *createMdiChild();
    void switchLayoutDirection();

private:
    enum { MaxRecentFiles = 5 };

    void createActions();
    void createStatusBar();
    void readSettings();
    void writeSettings();
    bool loadFile(const QString &fileName);
    static bool hasRecentFiles();
    void prependToRecentFiles(const QString &fileName);
    void setRecentFilesVisible(bool visible);
    MdiChild *activeMdiChild() const;
    QMdiSubWindow *findMdiChild(const QString &fileName) const;

    QMdiArea *mdiArea;

    QMenu *windowMenu;
    QAction *newAct;
    QAction *saveAct;
    QAction *saveAsAct;
    QAction *recentFileActs[MaxRecentFiles];
    QAction *recentFileSeparator;
    QAction *recentFileSubMenuAct;
#ifndef QT_NO_CLIPBOARD
    QAction *cutAct;
    QAction *copyAct;
    QAction *pasteAct;
#endif
    QAction *closeAct;
    QAction *closeAllAct;
    QAction *tileAct;
    QAction *cascadeAct;
    QAction *nextAct;
    QAction *previousAct;
    QAction *windowMenuSeparatorAct;
};

#endif