Fix background drawing in EVT_ERASE_BACKGROUND handler in erase sample.

Clear the DC before moving its offset to ensure that it's cleared entirely and
also draw the background using the virtual, not client, size.

See #14917.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73428 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/samples/erase/erase.cpp b/samples/erase/erase.cpp
index eb54c2ede3e43c215d7df50bbf84e7e132dbdb23..96e21c3b6fbd9c4211b077f18ee1735e863d7973 100644 (file)
--- a/samples/erase/erase.cpp
+++ b/samples/erase/erase.cpp
@@ -419,12 +419,12 @@ void MyCanvas::OnEraseBackground( wxEraseEvent& event )
     wxDC& dc = *event.GetDC();
     dc.SetPen(*wxGREEN_PEN);
 
-    PrepareDC( dc );
-
     // clear any junk currently displayed
     dc.Clear();
 
-    const wxSize size = GetClientSize();
+    PrepareDC( dc );
+
+    const wxSize size = GetVirtualSize();
     for ( int x = 0; x < size.x; x += 15 )
     {
         dc.DrawLine(x, 0, x, size.y);