fix Qt warnings when overview is hidden

git-svn-id: http://svn.osgeo.org/qgis/trunk@11196 c8812cc2-4d05-0410-92ff-de0c093fc19c
qgis · Jul 29, 2009 · d979b6c · d979b6c
1 parent 91713c7
commit d979b6c
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/gui/qgsmapoverviewcanvas.cpp b/src/gui/qgsmapoverviewcanvas.cpp
@@ -242,6 +242,9 @@ void QgsMapOverviewCanvas::paintEvent( QPaintEvent * pe )
 
 void QgsMapOverviewCanvas::refresh()
 {
+  if ( mPixmap.isNull() )
+    return;
+
   mPixmap.fill( mBgColor ); //palette().color(backgroundRole());
 
   QPainter painter;