Restored the ability to scroll.

[wxWidgets.git] / src / msw / dcclient.cpp

diff --git a/src/msw/dcclient.cpp b/src/msw/dcclient.cpp
index 9a347c6911a99355cc9b3ae8506ebe998f95c988..ea236015d5f00d8995da7560edc939835b6a795b 100644 (file)
--- a/src/msw/dcclient.cpp
+++ b/src/msw/dcclient.cpp
@@ -79,7 +79,7 @@ static PAINTSTRUCT g_paintStruct;
     // created in resopnse to WM_PAINT message - doing this from elsewhere is a
     // common programming error among wxWindows programmers and might lead to
     // very subtle and difficult to debug refresh/repaint bugs.
-    extern bool g_isPainting = FALSE;
+    int g_isPainting = 0;
 #endif // __WXDEBUG__
 
 // ===========================================================================
@@ -110,7 +110,11 @@ wxWindowDC::~wxWindowDC()
   {
     SelectOldObjects(m_hDC);
 
-    ::ReleaseDC(GetWinHwnd(m_canvas), GetHdc());
+    if ( !::ReleaseDC(GetWinHwnd(m_canvas), GetHdc()) )
+    {
+        wxLogLastError("ReleaseDC");
+    }
+
     m_hDC = 0;
   }
 
@@ -131,6 +135,11 @@ wxClientDC::wxClientDC(wxWindow *the_canvas)
   m_canvas = the_canvas;
   m_hDC = (WXHDC) ::GetDC(GetWinHwnd(the_canvas));
 
+  // the background mode is only used for text background
+  // and is set in DrawText() to OPAQUE as required, other-
+  // wise always TRANSPARENT, RR
+  ::SetBkMode( GetHdc(), TRANSPARENT );
+
   SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
 }
 
@@ -161,7 +170,7 @@ wxClientDC::~wxClientDC()
 //     So we store a list of windows for which we already have the DC and not
 //     just one single hDC. This seems to work, but I'm really not sure about
 //     the usefullness of the whole idea - IMHO it's much better to not call
-//     base class OnPaint() at all, or, if we realyl want to allow it, add a
+//     base class OnPaint() at all, or, if we really want to allow it, add a
 //     "wxPaintDC *" parameter to wxPaintEvent which should be used if it's
 //     !NULL instead of creating a new DC.
 
@@ -175,10 +184,10 @@ wxPaintDC::wxPaintDC()
 
 wxPaintDC::wxPaintDC(wxWindow *canvas)
 {
-    wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
+    wxCHECK_RET( canvas, _T("NULL canvas in wxPaintDC ctor") );
 
 #ifdef __WXDEBUG__
-    if ( !g_isPainting )
+    if ( g_isPainting <= 0 )
     {
         wxFAIL_MSG( _T("wxPaintDC may be created only in EVT_PAINT handler!") );
 
@@ -201,6 +210,11 @@ wxPaintDC::wxPaintDC(wxWindow *canvas)
         ms_cache.Add(new wxPaintDCInfo(m_canvas, this));
     }
 
+    // the background mode is only used for text background
+    // and is set in DrawText() to OPAQUE as required, other-
+    // wise always TRANSPARENT, RR
+    ::SetBkMode( GetHdc(), TRANSPARENT );
+
     SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
 }
 
@@ -208,6 +222,8 @@ wxPaintDC::~wxPaintDC()
 {
     if ( m_hDC )
     {
+        SelectOldObjects(m_hDC);
+
         size_t index;
         wxPaintDCInfo *info = FindInCache(&index);
 
@@ -220,6 +236,9 @@ wxPaintDC::~wxPaintDC()
             ms_cache.Remove(index);
         }
         //else: cached DC entry is still in use
+
+        // prevent the base class dtor from ReleaseDC()ing it again
+        m_hDC = 0;
     }
 }