wxDC::GetHandle support for wxGTK

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72226 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dc.h

@@ -136,6 +136,7 @@ public:
     virtual void EndPage() { }
 
     virtual GdkWindow* GetGDKWindow() const { return NULL; }
+    virtual void* GetHandle() const { return GetGDKWindow(); }
     
     // base class pure virtuals implemented here
     virtual void DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);

include/wx/gtk/dcmemory.h

@@ -39,6 +39,7 @@ public:
     // overridden from wxDCImpl
     virtual void DoGetSize( int *width, int *height ) const;
     virtual wxBitmap DoGetAsBitmap(const wxRect *subrect) const;
+    virtual void* GetHandle() const;
     
     // overridden for wxMemoryDC Impl
     virtual void DoSelect(const wxBitmap& bitmap);

include/wx/gtk/print.h

@@ -227,6 +227,7 @@ public:
     bool IsOk() const;
 
     virtual void* GetCairoContext() const;
+    virtual void* GetHandle() const;
     
     bool CanDrawBitmap() const { return true; }
     void Clear();

src/gtk/dcmemory.cpp

@@ -164,3 +164,8 @@ wxBitmap& wxMemoryDCImpl::GetSelectedBitmap()
     return m_selected;
 }
 
+void* wxMemoryDCImpl::GetHandle() const
+{
+    const wxBitmap& bmp = GetSelectedBitmap();
+    return bmp.GetPixmap();
+}

src/gtk/print.cpp

@@ -1216,6 +1216,11 @@ void* wxGtkPrinterDCImpl::GetCairoContext() const
     return (void*) cairo_reference( m_cairo );
 }
 
+void* wxGtkPrinterDCImpl::GetHandle() const
+{
+    return GetCairoContext();
+}
+
 bool wxGtkPrinterDCImpl::DoFloodFill(wxCoord WXUNUSED(x1),
                                wxCoord WXUNUSED(y1),
                                const wxColour& WXUNUSED(col),