Allow to use space to toggle spinning of the cube in OpenGL sample.

Small enhancement to the cube OpenGL sample.

Closes #11545.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65904 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/opengl/cube/cube.h

@@ -67,12 +67,16 @@ public:
 
 private:
     void OnPaint(wxPaintEvent& event);
+    void Spin(float xSpin, float ySpin);
     void OnKeyDown(wxKeyEvent& event);
+    void OnSpinTimer(wxTimerEvent& WXUNUSED(event));
 
     // angles of rotation around x- and y- axis
     float m_xangle,
           m_yangle;
 
+    wxTimer m_spinTimer;
+
     DECLARE_EVENT_TABLE()
 };