Implement standard zoom handling by mouse wheel and keys.

Suggested by Ales Kapica.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>

1 files changed, 10 insertions, 1 deletions

diff --git a/qtmips_gui/graphicsview.h b/qtmips_gui/graphicsview.h
index 8b47611..b970e86 100644
--- a/qtmips_gui/graphicsview.h
+++ b/qtmips_gui/graphicsview.h
@@ -38,18 +38,27 @@
 
 #include <QGraphicsView>
 #include <QGraphicsScene>
+#include <QWheelEvent>
+#include <QResizeEvent>
+#include <QKeyEvent>
 
 class GraphicsView : public QGraphicsView {
+    Q_OBJECT
+    using Super = QGraphicsView;
+
 public:
     GraphicsView(QWidget *parent);
-
     void setScene(QGraphicsScene *scene);
 
 protected:
     void resizeEvent(QResizeEvent *event);
+    void wheelEvent(QWheelEvent *event) override;
+    void keyPressEvent(QKeyEvent *event) override;
 
 private:
     void update_scale();
+    int prev_height;
+    int prev_width;
 };
 
 #endif // GRAPHICSVIEW_H