[gnomemm] Canvas/Item event handling

["gao chaowei" <chaoweigao hotmail com>]

I am use gnome-- to do a project. I want the Canvas to capture the button 
click event. Because the Canvas is in a scrolled window and the canvas can 
zoon in or zoom out. In button_release_event_impl method of my Canvas, the 
X and Y coordinates is relative to the main window. But i want the value 
relative to the canvas. Is there any way ?

I add some Canvas Items in the canvas and i want the items to handle some 
event. So i use the statement item.event.connect(slot(this, 
&Tree:compute)). It dose not work :-(
Hope someone Can help me ASAP. Urgent for me, thanks!!!

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