moved HasTransparentBackground() from wxUniv to common wxWindow

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31272 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/checkbox.h

@@ -101,8 +101,6 @@ public:
     // overridden base class virtuals
     virtual bool IsPressed() const { return m_isPressed; }
 
-    virtual bool HasTransparentBackground() { return true; }
-
 protected:
     virtual void DoSet3StateValue(wxCheckBoxState WXUNUSED(state));
     virtual wxCheckBoxState DoGet3StateValue() const;

include/wx/univ/statbox.h

@@ -51,8 +51,6 @@ public:
     // take account of this
     virtual wxPoint GetBoxAreaOrigin() const;
 
-    virtual bool HasTransparentBackground() { return true; }
-    
 protected:
     // draw the control
     virtual void DoDraw(wxControlRenderer *renderer);

include/wx/univ/stattext.h

@@ -55,8 +55,6 @@ public:
 
     virtual void SetLabel(const wxString& label);
 
-    virtual bool HasTransparentBackground() { return true; }
-
     virtual bool IsFocused() const { return false; }
 
 protected:

include/wx/univ/window.h

@@ -144,11 +144,6 @@ public:
     // controls only
     virtual bool IsCanvasWindow() const { return false; }
 
-    // returns true if the control has "transparent" areas such
-    // as a wxStaticText and wxCheckBox and the background should
-    // be adapted from a parent window
-    virtual bool HasTransparentBackground() { 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)
     virtual bool CanBeHighlighted() const { return false; }