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Re: Clearing widget events [message #35502 is a reply to message #35501]

Wed, 18 June 2003 13:22

MKatz843
Messages: 98
Registered: March 2002

Member

> Is it possible to clear any pending widget events without causing an
> existing event handler to be called?

You can use
widget_control, widget_ID, /CLEAR_EVENTS
but you should consider a few things in advance.
When the computer is busy with a long calculation and the user hits
the button repeatedly, I believe that the *operating system* may queue
the events. This may affect your ability to clear the events since IDL
may not have seen the events yet. Certainly an experiment will settle
the issue quickly.

I've found that this can be a thorny issue when you give the user a
"stop" button for something. If some other button is clicked several
times and is taking a while to process things, then the stop button's
event isn't able to magically jump ahead of the other queued events.
So stop buttons can't solve itchy-button-finger syndrome.

So, that said, I think a solution you may want to consider is this.
When the user presses the button, set the cursor to hourglass so the
user will see that it's calculating, and make the offending button
insensitive until the calculation is complete.
widget_control, button_ID, SENSITIVE=0 or 1.
widget_control, HOURGLASS=1 or 0 (I think that's correct).

Then the button can't generate new events until you're ready.

MKatz

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[Message index]

		Re: Clearing widget events By: Mark Hadfield on Wed, 18 June 2003 14:38
		Re: Clearing widget events By: JD Smith on Wed, 18 June 2003 14:08
		Re: Clearing widget events By: Craig Markwardt on Wed, 18 June 2003 13:45
		Re: Clearing widget events By: MKatz843 on Wed, 18 June 2003 13:22
		Re: Clearing widget events By: Ben Tupper on Wed, 18 June 2003 09:07

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