+ wxDECLARE_NO_COPY_CLASS(wxPaintDCInfoOur);
+};
+
+// This subclass contains information for the HDCs we receive from outside, as
+// WPARAM of WM_PAINT itself.
+class wxPaintDCInfoExternal : public wxPaintDCInfo
+{
+public:
+ wxPaintDCInfoExternal(HDC hdc)
+ : wxPaintDCInfo(hdc),
+ m_state(::SaveDC(hdc))
+ {
+ }
+
+ virtual ~wxPaintDCInfoExternal()
+ {
+ ::RestoreDC(m_hdc, m_state);
+ }
+
+private:
+ const int m_state;
+
+ wxDECLARE_NO_COPY_CLASS(wxPaintDCInfoExternal);
+};
+
+// The global map containing HDC to use for the given window. The entries in
+// this map only exist during WM_PAINT processing and are destroyed when it is
+// over.
+//
+// It is needed because in some circumstances it can happen that more than one
+// wxPaintDC is created for the same window during its WM_PAINT handling (and
+// as this can happen implicitly, e.g. by calling a function in some library,
+// this can be quite difficult to find) but we need to reuse the same HDC for
+// all of them because we can't call BeginPaint() more than once. So we cache
+// the first HDC created for the window in this map and then reuse it later if
+// needed. And, of course, remove it from the map when the painting is done.
+WX_DECLARE_HASH_MAP(wxWindow *, wxPaintDCInfo *,
+ wxPointerHash, wxPointerEqual,
+ PaintDCInfos);
+
+PaintDCInfos gs_PaintDCInfos;
+
+} // anonymous namespace
+
+// ----------------------------------------------------------------------------
+// global variables
+// ----------------------------------------------------------------------------
+
+#ifdef wxHAS_PAINT_DEBUG
+ // a global variable which we check to verify that wxPaintDC are only
+ // created in response to WM_PAINT message - doing this from elsewhere is a
+ // common programming error among wxWidgets programmers and might lead to
+ // very subtle and difficult to debug refresh/repaint bugs.
+ int g_isPainting = 0;
+#endif // wxHAS_PAINT_DEBUG
+
+// ===========================================================================
+// implementation
+// ===========================================================================
+
+// ----------------------------------------------------------------------------
+// wxMSWWindowDCImpl
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxWindowDCImpl, wxMSWDCImpl)
+
+wxWindowDCImpl::wxWindowDCImpl( wxDC *owner ) :
+ wxMSWDCImpl( owner )
projects / wxWidgets.git / blobdiff