> Perhaps you could give some more description regarding what you've
> changed, and why; what more complicated event structures benefit from
> this change? And does it break backward compatibility?
Ah sorry, here's a diff against trunk to show the changes a little
more clearly ( should of done that in the first place! ):
Index: event.py
===================================================================
--- event.py (revision 2016)
+++ event.py (working copy)
@@ -338,7 +338,7 @@
if handler:
try:
if handler(*args):
- return
+ return True
except TypeError:
self._raise_dispatch_exception(event_type, args, handler)
@@ -346,11 +346,13 @@
# Check instance for an event handler
if hasattr(self, event_type):
try:
- getattr(self, event_type)(*args)
+ return getattr(self, event_type)(*args)
except TypeError:
self._raise_dispatch_exception(
event_type, args, getattr(self, event_type))
+ return False
+
def _raise_dispatch_exception(self, event_type, args, handler):
# A common problem in applications is having the wrong number of
# arguments in an event handler. This is caught as a TypeError in
The added return statements allow you to check if an event has been
processed or not ( as long as your callbacks return something anyway
). It allows you to create schemes where dispatchers need to check if
an event has been processed and then possibly send it on to
parent/child/other handlers. Personally I've been using this for a
widget system where each control is an event dispatcher and so I need
a return value to decide whether to continue sending the event to
child controls or not.
As far as I know it doesn't break backward compatibility anywhere.
dunk
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