moved ProvidesBackground() from wxUniv to base wxWindow class; use it to prevent inheriting background brush beyond the windows which normally have their own background

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31073 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/bookctrl.h

@@ -179,8 +179,10 @@ public:
         }
     }
 
+    // override some base class virtuals
     virtual void ApplyParentThemeBackground(const wxColour& bg)
         { SetBackgroundColour(bg); }
+    virtual bool ProvidesBackground() const { return true; }
 
 protected:
     // remove the page and return a pointer to it

include/wx/toplevel.h

@@ -191,6 +191,7 @@ public:
     virtual bool Destroy();
     virtual bool IsTopLevel() const { return true; }
     virtual wxSize GetMaxSize() const;
+    virtual bool ProvidesBackground() const { return true; }
 
     // event handlers
     void OnCloseWindow(wxCloseEvent& event);

include/wx/univ/toplevel.h

@@ -143,8 +143,6 @@ public:
     virtual int GetMinWidth() const;
     virtual int GetMinHeight() const;
 
-    virtual bool ProvidesBackground() const { return true; }
-    
 protected:
     // handle titlebar button click event
     virtual void ClickTitleBarButton(long button);

include/wx/univ/window.h

@@ -148,11 +148,6 @@ public:
     // as a wxStaticText and wxCheckBox and the background should
     // be adapted from a parent window
     virtual bool HasTransparentBackground() { return false; }
-    
-    // to be used with function above: transparent windows get
-    // their background from parents that return true here,
-    // so this is mostly for wxPanel, wxTopLevelWindow etc.
-    virtual bool ProvidesBackground() const { return false; }
 
     // return true if this control can be highlighted when the mouse is over
     // it (the theme decides itself whether it is really highlighted or not)
@@ -183,7 +178,7 @@ public:
 
     // erase part of the control
     virtual void EraseBackground(wxDC& dc, const wxRect& rect);
-    
+
     // overridden base class methods
     // -----------------------------
 
@@ -252,12 +247,12 @@ protected:
 
     // the renderer we use
     wxRenderer *m_renderer;
-    
+
     // background bitmap info
     wxBitmap  m_bitmapBg;
     int       m_alignBgBitmap;
     wxStretch m_stretchBgBitmap;
-    
+
     // old size
     wxSize m_oldSize;
 

include/wx/window.h

@@ -757,6 +757,13 @@ public:
     }
     wxColour GetBackgroundColour() const;
 
+    // if the window shouldn't inherit its colour from the parent, override
+    // this function to return true
+    //
+    // this is currently only used by wxMSW and wxUniv but should be useful for
+    // the other ports too
+    virtual bool ProvidesBackground() const { return false; }
+
     virtual bool SetForegroundColour(const wxColour& colour);
     void SetOwnForegroundColour(const wxColour& colour)
     {