- // device context must inherit from wxWindowDC
- // (so it must be wxClientDC, wxMemoryDC or wxPaintDC)
- wxWindowDC& wdc = (wxWindowDC&)dc;
-
- // only doing debug-time checking here (it should probably be enough)
- wxASSERT ( wdc.IsKindOf(CLASSINFO(wxWindowDC)) );
+ // If we give GTK_PIZZA(win->m_wxwindow)->bin_window as
+ // a window for gtk_paint_xxx function, then it won't
+ // work for wxMemoryDC. So that is why we assume wxDC
+ // is wxWindowDC (wxClientDC, wxMemoryDC and wxPaintDC
+ // are derived from it) and use its m_window.
+ GdkWindow* gdk_window = dc.GetGDKWindow();
+ wxASSERT_MSG( gdk_window,
+ wxT("cannot use wxRendererNative on wxDC of this type") );
+
+ // draw arrow so that there is even space horizontally
+ // on both sides
+ int arrowX = rect.width/4 + 1;
+ int arrowWidth = rect.width - (arrowX*2);
+
+ // scale arrow's height accoording to the width
+ int arrowHeight = rect.width/3;
+ int arrowY = (rect.height-arrowHeight)/2 +
+ ((rect.height-arrowHeight) & 1);