overlay implementation

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41877 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/caret.cpp

@@ -88,10 +88,11 @@ void wxCaret::InitGeneric()
 {
     m_hasFocus = true;
     m_blinkedOut = true;
-
+#if wxUSE_OVERLAY == 0
     m_xOld =
     m_yOld = -1;
     m_bmpUnderCaret.Create(m_width, m_height);
+#endif
 }
 
 wxCaret::~wxCaret()
@@ -154,8 +155,10 @@ void wxCaret::DoSize()
         m_countVisible = 0;
         DoHide();
     }
+#if wxUSE_OVERLAY == 0
     // Change bitmap size
     m_bmpUnderCaret = wxBitmap(m_width, m_height);
+#endif
     if (countVisible > 0)
     {
         m_countVisible = countVisible;
@@ -208,6 +211,18 @@ void wxCaret::Blink()
 void wxCaret::Refresh()
 {
     wxClientDC dcWin(GetWindow());
+// this is the new code, switch to 0 if this gives problems
+#if wxUSE_OVERLAY
+    wxDCOverlay dcOverlay( m_overlay, &dcWin, m_x, m_y, m_width , m_height );
+    if ( m_blinkedOut )
+    {
+        dcOverlay.Clear();
+    }
+    else
+    {
+        DoDraw( &dcWin );
+    }
+#else
     wxMemoryDC dcMem;
     dcMem.SelectObject(m_bmpUnderCaret);
     if ( m_blinkedOut )
@@ -243,6 +258,7 @@ void wxCaret::Refresh()
         // and draw the caret there
         DoDraw(&dcWin);
     }
+#endif
 }
 
 void wxCaret::DoDraw(wxDC *dc)