another segfault fix

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

diff --git a/src/msw/dcclient.cpp b/src/msw/dcclient.cpp
index ec20193357d8f65392fa8867b9dc390bfa574f5f..d853cf580eafd5a10763882121c4b132161c9818 100644 (file)
--- a/src/msw/dcclient.cpp
+++ b/src/msw/dcclient.cpp
@@ -62,11 +62,9 @@ WX_DEFINE_OBJARRAY(wxArrayDCInfo);
 // macros
 // ----------------------------------------------------------------------------
 
 // macros
 // ----------------------------------------------------------------------------
 

-#if !USE_SHARED_LIBRARY
-    IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
-    IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)
-    IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxWindowDC)
-#endif
+IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
+IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)
+IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxClientDC)

 
 // ----------------------------------------------------------------------------
 // global variables
 
 // ----------------------------------------------------------------------------
 // global variables


@@ -92,33 +90,29 @@ static PAINTSTRUCT g_paintStruct;
 
 wxWindowDC::wxWindowDC()
 {
 
 wxWindowDC::wxWindowDC()
 {

-  m_canvas = NULL;
+    m_canvas = NULL;

 }
 
 }
 

-wxWindowDC::wxWindowDC(wxWindow *the_canvas)
+wxWindowDC::wxWindowDC(wxWindow *canvas)

 {
 {

-  m_canvas = the_canvas;
-  m_hDC = (WXHDC) ::GetWindowDC(GetWinHwnd(the_canvas) );
-  m_hDCCount++;
+    wxCHECK_RET( canvas, _T("invalid window in wxWindowDC") );

 
 

-  SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
+    m_canvas = canvas;
+    m_hDC = (WXHDC) ::GetWindowDC(GetHwndOf(m_canvas));
+
+    // m_bOwnsDC was already set to false in the base class ctor, so the DC
+    // will be released (and not deleted) in ~wxDC
+    InitDC();

 }
 
 }
 

-wxWindowDC::~wxWindowDC()
+void wxWindowDC::InitDC()

 {
 {

-  if (m_canvas && m_hDC)
-  {
-    SelectOldObjects(m_hDC);
+    // the background mode is only used for text background and is set in
+    // DrawText() to OPAQUE as required, otherwise always TRANSPARENT,
+    ::SetBkMode(GetHdc(), TRANSPARENT);

 
 

-    if ( !::ReleaseDC(GetWinHwnd(m_canvas), GetHdc()) )
-    {
-        wxLogLastError("ReleaseDC");
-    }
-
-    m_hDC = 0;
-  }
-
-  m_hDCCount--;
+    // default bg colour is pne of the window
+    SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -127,31 +121,43 @@ wxWindowDC::~wxWindowDC()
 
 wxClientDC::wxClientDC()
 {
 
 wxClientDC::wxClientDC()
 {

-  m_canvas = NULL;
+    m_canvas = NULL;

 }
 
 }
 

-wxClientDC::wxClientDC(wxWindow *the_canvas)
+wxClientDC::wxClientDC(wxWindow *canvas)

 {
 {

-  m_canvas = the_canvas;
-  m_hDC = (WXHDC) ::GetDC(GetWinHwnd(the_canvas));
+    wxCHECK_RET( canvas, _T("invalid window in wxClientDC") );
+
+    m_canvas = canvas;
+    m_hDC = (WXHDC)::GetDC(GetHwndOf(m_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 );
+    // m_bOwnsDC was already set to false in the base class ctor, so the DC
+    // will be released (and not deleted) in ~wxDC

 
 

-  SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
+    InitDC();

 }
 
 }
 

-wxClientDC::~wxClientDC()
+void wxClientDC::InitDC()

 {
 {

-  if ( m_canvas && GetHdc() )
-  {
-    SelectOldObjects(m_hDC);
+    wxWindowDC::InitDC();

 
 

-    ::ReleaseDC(GetWinHwnd(m_canvas), GetHdc());
-    m_hDC = 0;
-  }
+    // in wxUniv build we must manually do some DC adjustments usually
+    // performed by Windows for us
+#ifdef __WXUNIVERSAL__
+    wxPoint ptOrigin = m_canvas->GetClientAreaOrigin();
+    if ( ptOrigin.x || ptOrigin.y )
+    {
+        // no need to shift DC origin if shift is null
+        SetDeviceOrigin(ptOrigin.x, ptOrigin.y);
+    }
+
+    // clip the DC to avoid overwriting the non client area
+    SetClippingRegion(wxPoint(0, 0), m_canvas->GetClientSize());
+#endif // __WXUNIVERSAL__
+}
+
+wxClientDC::~wxClientDC()
+{

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -159,7 +165,7 @@ wxClientDC::~wxClientDC()
 // ----------------------------------------------------------------------------
 
 // VZ: initial implementation (by JACS) only remembered the last wxPaintDC
 // ----------------------------------------------------------------------------
 
 // VZ: initial implementation (by JACS) only remembered the last wxPaintDC

-//     created and tried to reuse - this was supposed to take care of a
+//     created and tried to reuse it - this was supposed to take care of a

 //     situation when a derived class OnPaint() calls base class OnPaint()
 //     because in this case ::BeginPaint() shouldn't be called second time.
 //
 //     situation when a derived class OnPaint() calls base class OnPaint()
 //     because in this case ::BeginPaint() shouldn't be called second time.
 //


@@ -179,7 +185,6 @@ wxArrayDCInfo wxPaintDC::ms_cache;
 wxPaintDC::wxPaintDC()
 {
     m_canvas = NULL;
 wxPaintDC::wxPaintDC()
 {
     m_canvas = NULL;

-    m_hDC = 0;

 }
 
 wxPaintDC::wxPaintDC(wxWindow *canvas)
 }
 
 wxPaintDC::wxPaintDC(wxWindow *canvas)


@@ -206,16 +211,15 @@ wxPaintDC::wxPaintDC(wxWindow *canvas)
     }
     else // not in cache, create a new one
     {
     }
     else // not in cache, create a new one
     {

-        m_hDC = (WXHDC)::BeginPaint(GetWinHwnd(m_canvas), &g_paintStruct);
-        ms_cache.Add(new wxPaintDCInfo(m_canvas, this));
+        m_hDC = (WXHDC)::BeginPaint(GetHwndOf(m_canvas), &g_paintStruct);
+       if (m_hDC)
+            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));
+    // (re)set the DC parameters.
+    // Note: at this point m_hDC can be NULL under MicroWindows, when dragging.
+    if (GetHDC())
+        InitDC();

 }
 
 wxPaintDC::~wxPaintDC()
 }
 
 wxPaintDC::~wxPaintDC()


@@ -231,9 +235,14 @@ wxPaintDC::~wxPaintDC()
 
         if ( !--info->count )
         {
 
         if ( !--info->count )
         {

-            ::EndPaint(GetWinHwnd(m_canvas), &g_paintStruct);
+            ::EndPaint(GetHwndOf(m_canvas), &g_paintStruct);
+
+            ms_cache.RemoveAt(index);

 
 

-            ms_cache.Remove(index);
+            // Reduce the number of bogus reports of non-freed memory
+            // at app exit
+            if (ms_cache.IsEmpty())
+                ms_cache.Clear();

         }
         //else: cached DC entry is still in use
 
         }
         //else: cached DC entry is still in use
 


@@ -259,3 +268,20 @@ wxPaintDCInfo *wxPaintDC::FindInCache(size_t *index) const
 
     return info;
 }
 
     return info;
 }

+
+// find the entry for this DC in the cache (keyed by the window)
+WXHDC wxPaintDC::FindDCInCache(wxWindow* win)
+{
+    wxPaintDCInfo *info = NULL;
+    size_t nCache = ms_cache.GetCount();
+    for ( size_t n = 0; n < nCache; n++ )
+    {
+        info = &ms_cache[n];
+        if ( info->hwnd == win->GetHWND() )
+        {
+            return info->hdc;
+        }
+    }
+    return 0;
+}
+