| Re: Keeping Button Pressed In? [message #45263 is a reply to message #45258] |
Wed, 24 August 2005 20:07   |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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hocmin@gmail.com writes:
> I'm new to IDL but have some experience in programming. I'm trying to
> recreate the MS Paint/Adobe Photoshop metaphor with my application
> through a series of image buttons. Basically, I want one button to
> stay pressed down, signifying the "mode" the application is in. Is
> this possible with widget_button's using the /bitmap keyword? I
> realize I could throw something up with radio buttons to achieve the
> same functionality, but I really think the pressed image buttons is a
> more elegant solution.
>
> If not possible, are there any workarounds? I tried using two
> different images, one to make it look like it's pressed. But the
> widget_button has too much padding between the image and the border of
> the button to make it "look" like it's pressed. I couldn't figure out
> a way around this either.
My approach to this problem is to write a compound widget
(usually an object widget, but it doesn't have to be). The
"button" is really a draw widget. I create the draw widget
using PLOTS and POLYFILL in such a way that it actually
*looks* like a button. And I assign a event handler *function*
(not procedure) to the draw widget. When an event occurs
I take it into the event handler and strip out all the
draw widget stuff, and make the event look like a button
event structure. I pass this back as the return value of
the event handler function and IDL treats it as though it
were an event bubbling up the widget hierarchy. Thus,
anyone who *uses* the compound widget *thinks* it is a
button, although it isn't.
When the button is "pressed", I invert the colors I used
to draw the button, and use light highlighting where before
I used dark, etc. I really does look as if the button was
depressed.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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