mainwindow.h Example File

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  #ifndef MAINWINDOW_H
  #define MAINWINDOW_H

  #include <QMainWindow>

  class QAction;
  class QMenu;
  class QPlainTextEdit;
  class QSessionManager;

  class MainWindow : public QMainWindow
  {
      Q_OBJECT

  public:
      MainWindow();

      void loadFile(const QString &fileName);

  protected:
      void closeEvent(QCloseEvent *event) Q_DECL_OVERRIDE;

  private slots:
      void newFile();
      void open();
      bool save();
      bool saveAs();
      void about();
      void documentWasModified();
  #ifndef QT_NO_SESSIONMANAGER
      void commitData(QSessionManager &);
  #endif

  private:
      void createActions();
      void createStatusBar();
      void readSettings();
      void writeSettings();
      bool maybeSave();
      bool saveFile(const QString &fileName);
      void setCurrentFile(const QString &fileName);
      QString strippedName(const QString &fullFileName);

      QPlainTextEdit *textEdit;
      QString curFile;
  };

  #endif