X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/25889d3c43f537fea00a2b7d6df7bd7e63e113f8..acc0ebd7a871124d4d6b36069340227e6c584f38:/src/msw/dcclient.cpp?ds=sidebyside

diff --git a/src/msw/dcclient.cpp b/src/msw/dcclient.cpp
index bbffc5a65a..d853cf580e 100644
--- a/src/msw/dcclient.cpp
+++ b/src/msw/dcclient.cpp
@@ -62,11 +62,9 @@ WX_DEFINE_OBJARRAY(wxArrayDCInfo);
 // 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
@@ -79,7 +77,7 @@ 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.
-    bool g_isPainting = FALSE;
+    int g_isPainting = 0;
 #endif // __WXDEBUG__
 
 // ===========================================================================
@@ -92,29 +90,29 @@ static PAINTSTRUCT g_paintStruct;
 
 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);
-
-    ::ReleaseDC(GetWinHwnd(m_canvas), GetHdc());
-    m_hDC = 0;
-  }
+    // the background mode is only used for text background and is set in
+    // DrawText() to OPAQUE as required, otherwise always TRANSPARENT,
+    ::SetBkMode(GetHdc(), TRANSPARENT);
 
-  m_hDCCount--;
+    // default bg colour is pne of the window
+    SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
 }
 
 // ----------------------------------------------------------------------------
@@ -123,26 +121,43 @@ wxWindowDC::~wxWindowDC()
 
 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));
 
-  SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
+    // m_bOwnsDC was already set to false in the base class ctor, so the DC
+    // will be released (and not deleted) in ~wxDC
+
+    InitDC();
 }
 
-wxClientDC::~wxClientDC()
+void wxClientDC::InitDC()
 {
-  if ( m_canvas && GetHdc() )
-  {
-    SelectOldObjects(m_hDC);
+    wxWindowDC::InitDC();
+
+    // 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__
+}
 
-    ::ReleaseDC(GetWinHwnd(m_canvas), GetHdc());
-    m_hDC = 0;
-  }
+wxClientDC::~wxClientDC()
+{
 }
 
 // ----------------------------------------------------------------------------
@@ -150,7 +165,7 @@ wxClientDC::~wxClientDC()
 // ----------------------------------------------------------------------------
 
 // 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.
 //
@@ -161,7 +176,7 @@ 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.
 
@@ -170,17 +185,16 @@ wxArrayDCInfo wxPaintDC::ms_cache;
 wxPaintDC::wxPaintDC()
 {
     m_canvas = NULL;
-    m_hDC = 0;
 }
 
 wxPaintDC::wxPaintDC(wxWindow *canvas)
 {
-    wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
+    wxCHECK_RET( canvas, wxT("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!") );
+        wxFAIL_MSG( wxT("wxPaintDC may be created only in EVT_PAINT handler!") );
 
         return;
     }
@@ -197,29 +211,43 @@ wxPaintDC::wxPaintDC(wxWindow *canvas)
     }
     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));
     }
 
-    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()
 {
     if ( m_hDC )
     {
+        SelectOldObjects(m_hDC);
+
         size_t index;
         wxPaintDCInfo *info = FindInCache(&index);
 
-        wxCHECK_RET( info, _T("existing DC should have a cache entry") );
+        wxCHECK_RET( info, wxT("existing DC should have a cache entry") );
 
         if ( !--info->count )
         {
-            ::EndPaint(GetWinHwnd(m_canvas), &g_paintStruct);
+            ::EndPaint(GetHwndOf(m_canvas), &g_paintStruct);
 
-            ms_cache.Remove(index);
+            ms_cache.RemoveAt(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
+
+        // prevent the base class dtor from ReleaseDC()ing it again
+        m_hDC = 0;
     }
 }
 
@@ -240,3 +268,20 @@ wxPaintDCInfo *wxPaintDC::FindInCache(size_t *index) const
 
     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;
+}
+