added wxAppTraits::CreateRenderer() which may be used to customize the renderer

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22341 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/apptrait.h

@@ -19,6 +19,7 @@ class WXDLLEXPORT wxAppTraits;
 #endif // wxUSE_FONTMAP
 class WXDLLEXPORT wxLog;
 class WXDLLEXPORT wxMessageOutput;
+class WXDLLEXPORT wxRendererNative;
 class WXDLLEXPORT wxString;
 
 // ----------------------------------------------------------------------------
@@ -44,6 +45,13 @@ public:
     virtual wxFontMapper *CreateFontMapper() = 0;
 #endif // wxUSE_FONTMAP
 
+    // get the renderer to use for drawing the generic controls (return value
+    // may be NULL in which case the default renderer for the current platform
+    // is used); this is used in GUI only and always returns NULL in console
+    //
+    // NB: returned pointer will be deleted by the caller
+    virtual wxRendererNative *CreateRenderer() = 0;
+
 
     // functions abstracting differences between GUI and console modes
     // ------------------------------------------------------------------------
@@ -123,6 +131,7 @@ public:
 #if wxUSE_FONTMAP
     virtual wxFontMapper *CreateFontMapper();
 #endif // wxUSE_FONTMAP
+    virtual wxRendererNative *CreateRenderer();
 
 #ifdef __WXDEBUG__
     virtual bool ShowAssertDialog(const wxString& msg);
@@ -149,6 +158,7 @@ public:
 #if wxUSE_FONTMAP
     virtual wxFontMapper *CreateFontMapper();
 #endif // wxUSE_FONTMAP
+    virtual wxRendererNative *CreateRenderer();
 
 #ifdef __WXDEBUG__
     virtual bool ShowAssertDialog(const wxString& msg);

include/wx/renderer.h

@@ -30,6 +30,13 @@ class WXDLLEXPORT wxWindow;
 
 #include "wx/gdicmn.h" // for wxPoint
 
+// some platforms have their own renderers, others use the generic one
+#if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXGTK__)
+    #define wxHAS_NATIVE_RENDERER
+#else
+    #undef wxHAS_NATIVE_RENDERER
+#endif
+
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
@@ -109,6 +116,9 @@ public:
 
     // return the generic implementation of the renderer
     static wxRendererNative& GetGeneric();
+
+    // return the default (native) implementation for this platform
+    static wxRendererNative& GetDefault();
 };
 
 // ----------------------------------------------------------------------------
@@ -159,5 +169,20 @@ protected:
     DECLARE_NO_COPY_CLASS(wxDelegateRendererNative)
 };
 
+// ----------------------------------------------------------------------------
+// inline functions implementation
+// ----------------------------------------------------------------------------
+
+#ifndef wxHAS_NATIVE_RENDERER
+
+// default native renderer is the generic one then
+/* static */ inline
+wxRendererNative& wxRendererNative::GetDefault()
+{
+    return GetGeneric();
+}
+
+#endif // !wxHAS_NATIVE_RENDERER
+
 #endif // _WX_RENDERER_H_
 

include/wx/window.h

@@ -831,7 +831,17 @@ public:
     wxSizer *GetSizer() const { return m_windowSizer; }
 
     // Track if this window is a member of a sizer
-    void SetContainingSizer(wxSizer* sizer) { m_containingSizer = sizer; }
+    void SetContainingSizer(wxSizer* sizer)
+    {
+        // adding a window to a sizer twice is going to result in fatal and
+        // hard to debug problems later because when deleting the second
+        // associated wxSizerItem we're going to dereference a dangling
+        // pointer; so try to detect this as early as possible
+        wxASSERT_MSG( !sizer || m_containingSizer != sizer,
+                        _T("Adding a window to the same sizer twice?") );
+
+        m_containingSizer = sizer;
+    }
     wxSizer *GetContainingSizer() const { return m_containingSizer; }
 
     // accessibility