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Re: List Widgets: drag & drop?
| Re: List Widgets: drag & drop? [message #6684] |
Mon, 29 July 1996 00:00 |
David Foster
Messages: 341
Registered: January 1996
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Senior Member |
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Filip Vanhellemont <Filip.Vanhellemont@oma.be> wrote:
>
> Does anyone know if it is possible to make use of drag & drop events
> with list widgets? I have noticed that, when I click the middle mouse
> button on an item in
> a list widget, a drag & drop mouse pointer appears. The problem is, that
> this does not generate an event.
> I would like to be able to drag a data file into a draw region. IDL
> documentation offers no help.
As for the list widgets returning drag/drop events, you're out of
luck. From the on-line help under WIDGET_LIST you can see that
the only information returned is the index of the item selected
and whether the button press was a single- or double-click.
You might try using a multi-line WIDGET_TEXT widget, where drag/drop
events can be returned by specifying the /ALL_EVENTS and
/EDITABLE keywords. But note that this is simply for cutting and
pasting text into the widget.
If you want to display the contents of a file "dragged" from a
list widget, why not simply reference the filename selected using
the EVENT.INDEX structure element and then display the file? You
could then have your program prompt you to select a draw region to use
for the display, using a mouse press that would generate an event
from the appropriate draw widget.
I don't think you're going to be able to drag your file into the
draw region like you'd like. You might check the RESOURCE_NAME
keyword that can be applied to all widget-creation routines,
and see if you can somehow use your .Xdefaults file to modify
the behavior of your widgets.
David Foster
foster@bial1.ucsd.edu
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