mainwindow.h Example File

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  #ifndef MAINWINDOW_H
  #define MAINWINDOW_H

  #include <QMainWindow>
  #include <QList>

  class QAction;
  class QMenu;
  class QTextEdit;

  class MainWindow : public QMainWindow
  {
      Q_OBJECT

  public:
      MainWindow();
      explicit MainWindow(const QString &fileName);

      void tile(const QMainWindow *previous);

  protected:
      void closeEvent(QCloseEvent *event) override;

  private slots:
      void newFile();
      void open();
      bool save();
      bool saveAs();
      void updateRecentFileActions();
      void openRecentFile();
      void about();
      void documentWasModified();

  private:
      enum { MaxRecentFiles = 5 };

      void init();
      void createActions();
      void createStatusBar();
      void readSettings();
      void writeSettings();
      bool maybeSave();
      void openFile(const QString &fileName);
      void loadFile(const QString &fileName);
      static bool hasRecentFiles();
      void prependToRecentFiles(const QString &fileName);
      void setRecentFilesVisible(bool visible);
      bool saveFile(const QString &fileName);
      void setCurrentFile(const QString &fileName);
      static QString strippedName(const QString &fullFileName);
      MainWindow *findMainWindow(const QString &fileName) const;

      QTextEdit *textEdit;

      QAction *recentFileActs[MaxRecentFiles];
      QAction *recentFileSeparator;
      QAction *recentFileSubMenuAct;

      QString curFile;
      bool isUntitled;
  };

  #endif