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valid vs managed widget [message #40140]

Tue, 20 July 2004 06:33

btt
Messages: 345
Registered: December 2000

Senior Member

Hello,

When I want to have a particular GUI realized only once (say for a GUI based
object property editor) I have always used ...

If WIDGET_INFO(myWidgetID, /VALID_ID) EQ 1 BEGIN
WIDGET_CONTROL, myWidgetID, /SHOW
RETURN
END

But this morning the heavy fog out on the bay has crept into my mind and filled
it with a nagging doubt; should I be testing if IDL is already managing the
widget ID instead? Some combination? And just what is the difference between a
VALID ID and a MANAGED ID?

Here's the online description of each keyword to WIDGET_INFO.

VALID_ID
Set this keyword to return 1 if Widget_ID represents a currently-valid widget.
Otherwise, 0 is returned.

MANAGED
Set this keyword to return 1 if the specified widget is managed, or 0 otherwise.

Thanks!
Ben

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