Added ability to call wxWindow::OnPaint under Windows (experimental).

Added wxTR_NO_LINES to remove lines from tree control (MSW only).


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7925 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/window.cpp

@@ -2952,6 +2952,16 @@ bool wxWindow::HandlePaint()
     return GetEventHandler()->ProcessEvent(event);
 }
 
+// Can be called from an application's OnPaint handler
+void wxWindow::OnPaint(wxPaintEvent& event)
+{
+    HDC hDC = (HDC) wxPaintDC::FindDCInCache((wxWindow*) event.GetEventObject());
+    if (hDC != 0)
+    {
+        MSWDefWindowProc(WM_PAINT, (WPARAM) hDC, 0);
+    }
+}
+
 bool wxWindow::HandleEraseBkgnd(WXHDC hdc)
 {
     // Prevents flicker when dragging