implementing rollover and pressed image for bitmapbutton on osx_cocoa

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62335 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/bmpbuttn.h

@@ -40,11 +40,15 @@ public:
                 const wxString& name = wxButtonNameStr);
 
 protected:
+    void OnEnterWindow( wxMouseEvent& event);
+    void OnLeaveWindow( wxMouseEvent& event);
+    
     virtual wxSize DoGetBestSize() const;
 
     virtual void DoSetBitmap(const wxBitmap& bitmap, State which);
 
     DECLARE_DYNAMIC_CLASS(wxBitmapButton)
+    DECLARE_EVENT_TABLE()
 };
 
 #endif // _WX_OSX_BMPBUTTN_H_

include/wx/osx/cocoa/private.h

@@ -261,6 +261,7 @@ protected :
 
     @interface wxNSButton : NSButton
     {
+        NSTrackingRectTag rectTag;
     }
 
     @end

include/wx/osx/core/private.h

@@ -587,6 +587,19 @@ public :
     virtual void CheckSpelling(bool WXUNUSED(check)) { }
 };
 
+//
+// common interface bitmapbuttons
+//
+
+class wxBitmapButtonImpl
+{
+    public :
+    wxBitmapButtonImpl(){}
+    virtual ~wxBitmapButtonImpl(){}
+    
+    virtual void SetPressedBitmap( const wxBitmap& bitmap ) = 0;
+} ;
+
 //
 // common interface for search controls
 //