From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Wed, 20 Jul 2011 11:41:07 +0000 (+0000)
Subject: Don't use template member function in drawing sample to placate VC6.
X-Git-Url: https://git.saurik.com/wxWidgets.git/commitdiff_plain/5707e433a3cac5a69fe3ba4e8e8664ffe749f402

Don't use template member function in drawing sample to placate VC6.

VC6 can't instantiate member template functions so get rid of it and use ugly
dynamic casts in the non-template function to construct wxGCDC correctly.

See #13327.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68311 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---

diff --git a/samples/drawing/drawing.cpp b/samples/drawing/drawing.cpp
index edb821c26b..bf1a09c7ed 100644
--- a/samples/drawing/drawing.cpp
+++ b/samples/drawing/drawing.cpp
@@ -149,7 +149,7 @@ public:
 #if wxUSE_GRAPHICS_CONTEXT
     void UseGraphicContext(bool use) { m_useContext = use; Refresh(); }
 #endif
-    template <typename T> void Draw(T& dc);
+    void Draw(wxDC& dc);
 
 protected:
     enum DrawMode
@@ -1487,26 +1487,47 @@ void MyCanvas::DrawRegionsHelper(wxDC& dc, wxCoord x, bool firstTime)
     }
 }
 
-#if TEST_CAIRO_EVERYWHERE
-extern wxGraphicsRenderer* gCairoRenderer;
-#endif
-
 void MyCanvas::OnPaint(wxPaintEvent &WXUNUSED(event))
 {
     wxPaintDC pdc(this);
     Draw(pdc);
 }
 
-template <typename T>
-void MyCanvas::Draw(T& pdc)
+void MyCanvas::Draw(wxDC& pdc)
 {
 #if wxUSE_GRAPHICS_CONTEXT
-#if TEST_CAIRO_EVERYWHERE
     wxGCDC gdc;
-    gdc.SetGraphicsContext( gCairoRenderer->CreateContext( pdc ) );
+    wxGraphicsRenderer* const renderer = wxGraphicsRenderer::
+#if TEST_CAIRO_EVERYWHERE
+        GetCairoRenderer()
 #else
-     wxGCDC gdc( pdc ) ;
+        GetDefaultRenderer()
 #endif
+        ;
+
+    wxGraphicsContext* context;
+    if ( wxPaintDC *paintdc = wxDynamicCast(&pdc, wxPaintDC) )
+    {
+        context = renderer->CreateContext(*paintdc);
+    }
+    else if ( wxMemoryDC *memdc = wxDynamicCast(&pdc, wxMemoryDC) )
+    {
+        context = renderer->CreateContext(*memdc);
+    }
+#if wxUSE_METAFILE && defined(wxMETAFILE_IS_ENH)
+    else if ( wxMetafileDC *metadc = wxDynamicCast(&pdc, wxMetafileDC) )
+    {
+        context = renderer->CreateContext(*metadc);
+    }
+#endif
+    else
+    {
+        wxFAIL_MSG( "Unknown wxDC kind" );
+        return;
+    }
+
+    gdc.SetGraphicsContext(context);
+
     wxDC &dc = m_useContext ? (wxDC&) gdc : (wxDC&) pdc ;
 #else
     wxDC &dc = pdc ;