Made _SetFocus hook function an optional function

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3921 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/server/Decorator.cpp

@@ -551,3 +551,13 @@ click_type Decorator::Clicked(BPoint pt, int32 buttons, int32 modifiers)
 	return CLICK_NONE;
 }
 
+//! Hook function called when the decorator changes focus
+void Decorator::_SetFocus(void)
+{
+}
+
+//! Function for calculating layout for the decorator
+void Decorator::_DoLayout(void)
+{
+	
+}

src/servers/app/server/Decorator.h

@@ -108,8 +108,8 @@ protected:
 	virtual void _DrawTab(BRect r);
 	virtual void _DrawTitle(BRect r);
 	virtual void _DrawZoom(BRect r);
-	virtual void _SetFocus(void)=0;
+	virtual void _SetFocus(void);
-	virtual void _DoLayout(void)=0;
+	virtual void _DoLayout(void);
 	virtual void _SetColors(void);
 	
 	ColorSet *_colors;