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mainwindow.h Example File
demos/undo/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>
 #include "ui_mainwindow.h"

 class Document;

 class MainWindow : public QMainWindow, public Ui::MainWindow
 {
     Q_OBJECT

 public:
     MainWindow(QWidget *parent = 0);

     void addDocument(Document *doc);
     void removeDocument(Document *doc);
     void setCurrentDocument(Document *doc);
     Document *currentDocument() const;

 public slots:
     void openDocument();
     void saveDocument();
     void closeDocument();
     void newDocument();

     void addShape();
     void removeShape();
     void setShapeColor();

     void addSnowman();
     void addRobot();

     void about();
     void aboutQt();

 private slots:
     void updateActions();

 private:
     QUndoGroup *m_undoGroup;

     QString fixedWindowTitle(const Document *doc) const;
 };

 #endif // MAINWINDOW_H