Henry;
Does the MSDN website cover this?
msdn.microsoft.com (?)
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|\/| Randy A MacDonald | APL: If you can say it, it's done.. (ram)
|/\| [EMAIL PROTECTED] |
|\ | |If you cannot describe what you are doing
BSc(Math) UNBF'83 |as a process, you don't know what you're doing.
Sapere Aude | - W. E. Deming
Natural Born APL'er | Demo website: http://156.34.92.52/
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----- Original Message -----
From: "Henry Rich" <[EMAIL PROTECTED]>
To: "'Beta forum'" <[email protected]>
Sent: Saturday, August 19, 2006 7:41 PM
Subject: RE: Liberty for Events! WAS: [Jbeta] scrollbar event
If I could learn where to read about the event system,
I'd go there, but till then I will have to rely on
the kindness of friends.
Take the event I called 'hover', which from the uniformity
of behavior of apps I guessed was an event that was
produced when the mouse lingers over a control for a while.
(the apps display a tooltip).
Now Eric says the list of events for isigraphs is complete,
and you are telling me that there is no such thing as a
hover event, so I suppose that the apps must start a timer
from each mousemove and draw the tooltip after a period
of no mouse movement. I can do that.
Can you tell me how to display a tooltip? Is it a
special API call, or a control created over an isigraph?
I'm guessing a special API call, because the tooltip seems
not to respect the boundaries of child controls.
And do I understand Eric to be saying that tooltips for
non-isigraphs will not be supported, because mouse events
for them are not in plan? (I'm in no hurry and can wait
till after the release to discuss it).
What I'd really like to find is a website that collects
this information.
Henry Rich
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Oleg Kobchenko
Sent: Saturday, August 19, 2006 6:01 PM
To: Beta forum
Subject: Re: Liberty for Events! WAS: [Jbeta] scrollbar event
I also wish you understood the event system better :)
What is "hover" event? Events like API, can be low level
and high level, which you generate in your code for
consumption by your high level handlers.
Windows sends events (messages) indiscreminately,
while Java won't send any events, unless you register
a handler for each event (or group thereof).
(J Windows using MFC is similar to Java though).
To make it work, J wd "subscribes" at compile time to all
supported events. Then to avoid the complication of
maintaining the repertoir of events available to each
control, it does a clever thing: it delegates the decision
to wdhandler, which determines by reflection (!) whether
the control has a handler and invokes it. Very neat I think.
There are two reasons why it's impossible to process
future unsupported events: in Java, that's a programmatic
operation requiring concrete classes, etc., not just an event "ID";
and different events have additional parameters to pass back,
like mouse coordinates, etc.
--- Henry Rich <[EMAIL PROTECTED]> wrote:
> I wish I understood the event system better. My primitive
> view is that the OS sends J a bunch of events, and J decides
> which ones it will handle and which it will pass to user code,
> and discards the rest.
>
> Like Bill says, nowadays J can handle a lot of events.
> Why not have a foreign that lets the J app indicate what
> events it will handle? Then there will be no need
> for system modification every time a user makes a
> good case for an event. The call would be something like
>
> EVENT_HOVER 9!:51 <'hover'
>
> to start handling the HOVER event.
>
> For events associated with a form, the event will pass to wdhandler
> to be processed in the form's locale. The right argument to
> 9!:51 is the name of the handler (wdhandler will append
> form_ and child_ as appropriate).
>
> For other events, the given handler will be called directly.
>
> Henry Rich
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On Behalf Of bill lam
> > Sent: Saturday, August 19, 2006 10:25 AM
> > To: Beta forum
> > Subject: [Jbeta] scrollbar event
> >
> > can scrollbar trigger an event while dragging the thumb? IMO
> > hardware is much
> > faster than that of 10 years ago, more events can be handled
> > when running J.
> >
> > --
> > regards,
> > bill
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