canvas event propagation

[Brian Craft <bcboy thecraftstudio com>]

The event handler for the GnomeCanvas gets called before any GnomeCanvasItem
event handlers. The event handlers for items only get called if the GnomeCanvas
event handler returns false. How is this useful?

Suppose you want to be able to rubber-band select items on the canvas, and be
able to point & click select items. If you don't install an event handler for
the canvas, you never get the rubber-band events. If you *do* install an event
handler for the canvas, you don't know when the handler gets called whether the
event should be passed to an item or begin a rubber-band select.

I don't get it. Shouldn't it be called *last*, when no items have handled the
event? Like in a window hierarchy?

b.c.