AW: Motif/Xt: Dynamically resize the visible item count of an XmList

[Walter Harms]

Hello,
for my understand of Widget programming it is a question
of the widget itself. It has some code inside to handle the resize event
and in this moment there seems no update of the visible_item_count.


________________________________________
Von: xorg <xorg-bounces at lists.x.org> im Auftrag von Holger Sebert <holger.sebert at ruhr-uni-bochum.de>
Gesendet: Freitag, 3. Dezember 2021 00:35:07
An: xorg at lists.x.org
Betreff: Motif/Xt: Dynamically resize the visible item count of an XmList

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Hi,

I have an XmList (actually a ScrolledList) inside a RowColumn widget.

The visible item count of the list is configured at widget creation
time. When the RowColumn widget is resized, I would like to adapt that
visible item count to the new size of the parent widget.

Is there an easy way to do this?

What I have come up with so far in theroy is to do the following:
Listen to the resize event of the RowColumn widget, recompute the
visible line count in a callback and then set it explicitly using
XtSetValues(XmNvisibleItemCount).

Unfortunately, I have not found any callback resource in the RowColumn
widget.

How can I listen to resize events of a widget?

Best,
Holger