Tile: the 15 Puzzle game written in Qt4

This was my first real try for Qt (and C++, too).
Don't beat me hard :)

Tile/src/tile.h

@@ -0,0 +1,43 @@
+#ifndef TILE_H
+#define TILE_H
+
+#include <QMainWindow>
+#include <QDebug>
+#include <QPushButton>
+#include <QTime>
+#include <QMessageBox>
+#include <QKeyEvent>
+
+namespace Ui {
+    class Tile;
+}
+
+class Tile : public QMainWindow {
+    Q_OBJECT
+public:
+    Tile(QWidget *parent = 0);
+    ~Tile();
+
+public slots:
+    void checkNeighbours();
+    QPushButton* idtoButton(int id);
+    void swapButtons(QPushButton *button, QPushButton *button_neighbour);
+    void Reset();
+    void Quit();
+    void Shuffle();
+    int randInt(int low, int high);
+    bool isSolvable();
+    void Help();
+    void keyPressEvent(QKeyEvent *event);
+    bool eventFilter(QObject *obj, QEvent *event);
+    void keyUp(QPushButton *button);
+    void keyDown(QPushButton *button);
+
+protected:
+    void changeEvent(QEvent *e);
+
+private:
+    Ui::Tile *ui;
+};
+
+#endif // TILE_H