mainwindow.h Example File

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QPixmap>
 #include <QMainWindow>

 class PuzzleWidget;
 class PiecesModel;
 class QListView;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow(QWidget *parent = 0);

 public slots:
     void openImage(const QString &path = QString());
     void setupPuzzle();

 private slots:
     void setCompleted();

 private:
     void setupMenus();
     void setupWidgets();

     QPixmap puzzleImage;
     QListView *piecesList;
     PuzzleWidget *puzzleWidget;
     PiecesModel *model;
 };

 #endif