Next big step in the event handling:

* RootLayer's mouse event processing is now at its minimum - the
  EventDispatcher handles them now. As a result, a window will now
  get only one message per event.
* RootLayer adds "_view_token" to mouse moved messages that specify
  the view currently under the cursor.
* There is now a mouse event layer in RootLayer that gets preferred
  when it's set - this is now used for the window moving instead of
  the previous mechanism.
* changed the previous DistributeMessage() to an UnpackMessage()
  method following Adi's suggestion.
* caveat: some things might be functionally broken in RootLayer now
  because of removing the mouse notification stuff.
* "be:transit" handling is now done completely client side by
  BWindow::_SanitizeMessage(() (similar to what the input_server does).
  This should also make the mechanism pretty robust, since every
  B_MOUSE_MOVED message can now trigger the view transit (in case a
  message is lost). B_WINDOW_ACTIVATED messages should be generated
  client side as well.
* renamed AS_LAYER_GET_MOUSE_COORDS to AS_GET_MOUSE as it's not a
  layer specific command, and also gets the mouse buttons.
* B_MOUSE_* messages from the up server now contain only a "screen_where"
  field; "where" (in window's coordinates) and "be:view_where" are
  added in BMessage::_SanitizeMessage().
* messages that don't have a valid target in the looper are now
  dropped instead of being sent to the looper - this should be done
  in BLooper as well, though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15087 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/interface/Window.h

@@ -226,6 +226,7 @@ public:
 
 private:
 	typedef BLooper inherited;
+	struct unpack_cookie;
 	class Shortcut;
 
 	friend class BApplication;
@@ -267,7 +268,10 @@ private:
 			void		AddShortcut(uint32 key, uint32 modifiers,
 							BMenuItem* item);
 			BHandler*	_DetermineTarget(BMessage* message, BHandler* target);
-			bool		_DistributeMessage(BMessage* message, BHandler* target);
+			bool		_UnpackMessage(unpack_cookie& state, BMessage** _message,
+							BHandler** _target, bool* _usePreferred);
+			void		_SanitizeMessage(BMessage* message, BHandler* target,
+							bool usePreferred);
 
 			bool		InUpdate();
 			void		_DequeueAll();