You can put anything you like into the body, or headers, of an AsyncMessage; a string, a number, an anonymous Object, a typed Object (if you use a typed Object be sure to tag it with [RemoteClass] metadata). You can control which subscribed Consumers receive the message by using the Consumer.selector property (a SQL-92 expression evaluated on the server against the headers of incoming messages; if the message headers satisfy the expression the message will be delivered to the Consumer), or by using the Consumer.subtopic property to subscribe to a subtopic (or range of subtopics) within a destination and using the Producer.subtopic property to control which specific subtopic sent messages go to.
When building 'screen-sharing' style applications like this, you need to really keep network latency in mind. Some GUI frameworks will 'summarize' events before handing off to even local processing (i.e. collapsing a bunch of individual key strokes into a summary string containing all the characters typed since the last event dispatch and just dispatching that single event). This becomes even more important when you're considering sending lots of high frequency events over the network to peers. In this case, I'd recommend sending a single message to subscribed peers on drop complete, indicating which component was dragged and dropped along with its final location. You can then either just reparent the corresponding component immediately on the receiving peer, or animate it along a simple path. There are lots of options with this sort of thing, but you shouldn't try to generate and send a message for each pixel it is dragged. Hope that helps, Seth From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of jeffreyr6915 Sent: Wednesday, May 14, 2008 11:01 PM To: flexcoders@yahoogroups.com Subject: [flexcoders] Flex Messaging Service + Drag and Drop List Component I have a 2 list components in which I have enabled drag and drop (dragEnabled="true" dropEnabled="true" dragMoveEnabled="true" dragDrop="dragDropHandler(event)"). So, I am able to drag and drop the List items (which I have a custom itemRenderer for). I am also using flex messaging service (Flex data services) so that a change made in one connected client/browser is propagated to all other connected browsers. I would like to be able to drag an item from one list to another (in one browser) and see that drag and drop happen (as it is happening) in all other connected browsers. I know that I need to send an AsyncMessage to the server via a producer, and receive from the server via a consumer. Question: What do I include in the async message in order to see the list items drag/drop as it is happening in all connected browsers? Can someone help me with code/example? Thanks
