So, thinking about this, 1490 is basically asking for the 'target' to
be passed. In DOM1 the target is 'this' because adding a handler
adds it as a method on the event sender. That clearly can't work for
us, because 99% of our handlers are methods on another object. In
DOM2, what a handler gets is an event descriptor object, with lots of
properties. Always at least the target and some other stuff
depending on the type of the event. I am wrestling with whether it
is more important to pass multiple-values to a handler or to pass
more information about the event.
It seems a shame to have to cons up an event descriptor if most
handlers don't need it.
It also seems a shame to have to burden all event processing with the
overhead of apply, just so one or two handlers can be passed multiple
arguments.
Should we just add the target as the second argument to handlers for
those who need it, and make handlers that need multiple arguments use
an object?
We could be _very_ clever and look at the number of arguments the
handler expects and create an DOM2-like event object only if the
handler expects a second argument.
Thoughts?
On 2006-10-25, at 11:57 EDT, Jim Grandy wrote:
Just noting we have bugs in JIRA on this theme:
http://www.openlaszlo.org/jira/browse/LPP-1490
http://www.openlaszlo.org/jira/browse/LPP-383
Elliot says:
LPP-1490 is much more useful and the last work-around that I did
for mouse
track events was really hacky and didn't work 100% of the time. I
created an
invisible view that listened for all mouse events, set a globally
accessible
var with the currently moused-over view, and then dispatched the
event to the
correct view underneath.
On Oct 23, 2006, at 2:30 PM, Adam Wolff wrote:
If we do this, can we also make it variadic so that delegates get
called
back with/can pass more than one argument.
A
On Oct 23, P T Withington wrote:
What do people think about changing the idiom:
<event>.sendEvent(<value>);
to:
sendEvent(<event>, <value>);
?
This would make it easier to detect errors (trying to send an
event to a
non-existent event) and to optimize (to not bother if there are
no listenters
for the event).
Comments?
