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Re: Dynamically adding and removing widgets [message #46450]

Wed, 23 November 2005 23:16

peter.albert@gmx.de is currently offline

peter.albert@gmx.de
Messages: 108
Registered: July 2005

Senior Member

Hi all,

well, I'd guess that the state variable *does* exist in the routine
"show_phenomenon":

In "pro event_handler", state is assigned to the uvalue of the parent
widget :
WIDGET_CONTROL,Event.TOP,SET_UVALUE=state,/NO_COPY

It is correct that the variable "state" itself is undefined afterwards,
but it does still exist as the UVALUE or the root widget. Then the
routine "show_phenomenon" is called with the "event" variable as a
parameter, which is fine, as "event" also still exists. Especially,
event.top still points at the parent widget. Therefore, when calling

widget_control,Event.Top,GET_UVALUE=state

within "show_phenomenon", everything works as expected and the "state"
is read from the parent widget's uvalue.

So where is the problem coming from?

The real problem is with the "base" variable:

You use

mask_disp = WIDGET_DRAW(base,xsize=numCols,ysize=numRows)

where "base" is expected to be a valid widget ID. As you showed
yourself, however, "base" holds the string "mask_tab":

>> IDL> print, base
>> mask_tab

Why?

Because in the line above you use

base = widget_info(state.mask_tab,/UNAME)

Using /UNAME with WIDGET_INFO returns the user name of the widget.

So probably

mask_disp = WIDGET_DRAW(state.mask_tab, xsize=numCols,ysize=numRows)

is just what you want?

It will create the new draw widget right in the widget whose ID is
state.mask_tab.

Cheers,

Peter

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[Message index]

		Re: Dynamically adding and removing widgets By: peter.albert@gmx.de on Wed, 23 November 2005 23:16
		Re: Dynamically adding and removing widgets By: David Fanning on Wed, 23 November 2005 11:23
		Re: Dynamically adding and removing widgets By: akkiraju on Wed, 23 November 2005 10:29
		Re: Dynamically adding and removing widgets By: Antonio Santiago on Wed, 23 November 2005 09:58

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