Re: Continuous controls: detecting when the last message comes through
Re: Continuous controls: detecting when the last message comes through
- Subject: Re: Continuous controls: detecting when the last message comes through
- From: Jean-François Veillette <email@hidden>
- Date: Wed, 11 Jul 2001 12:33:09 -0400
oups ...
should read :
[NSObject cancelPreviousPerformRequestsWithTarget:self
selector:@selector(generate:)
object:nil];
[self performSelector:@selector(generate:)
withObject:nil
afterDelay:0.1];
}
- jfv
Le Mercredi 11 juillet 2001, ` 12:12, Jean-Frangois Veillette a icrit :
>
A side effects of those slider is that they hold on the event loop,
>
they loop in a 'while()' to check for mouse events and move the slider
>
accordingly.
>
>
In my case, the slider was modifying the model, and the model was
>
posting notification about it's changes.
>
>
- (void)update:(NSNotification*)notification
>
{
>
if([window isVisible])
>
{
>
[NSObject cancelPreviousPerformRequestsWithTarget:self
>
>
selector:@selector(print:)
>
object:nil];
>
[self performSelector:@selector(generate:)
>
withObject:nil
>
afterDelay:0.1];
>
}
>
}
>
>
This will actualy do the generate: method at the next event-loop. when
>
the slider is finished with it's things.
>
>
- jfv
>
>
Le Mercredi 11 juillet 2001, ` 11:24, Phil Barrett a icrit :
>
>
> Is there a way to tell if the action sent by a continuous control
>
> (e.g. a
>
> slider or scroller) is the final one, caused by the mouse-up?
>
>
>
> While the user is dragging the slider back and forth, I want to do
>
> quick
>
> updates to give feedback, but I need to know when the mouse is
>
> released and
>
> I get a final action, so I can do a slower update of the information.
>
>
>
> Maybe it's as simple as asking if the mouse button is down when the
>
> action
>
> is received - but what's the easiest way to do that? I'm already
>
> watching
>
> the events coming through [NSApplication sendEvent:] but this only
>
> sees the
>
> mouse down that started the drag, so I can't check there.
>
>
>
> Or is there a way to ask an NSCell it it's currently tracking the
>
> mouse?
>
>
>
> Thanks
>
>
>
> Phil
>
> --
>
> Phil Barrett - CTO - Cambridge Animation Systems
>
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>
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>
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>
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