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List:       freedesktop-xorg
Subject:    Re: Motif/Xt: Dynamically resize the visible item count of an XmList
From:       "Chris Sorenson" <csoren () cpinternet ! com>
Date:       2021-12-06 0:41:55
Message-ID: 1638751315.tvm3q11yosg8g004 () webmail ! mycci ! net
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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
>

I'm sure this is an oversimplification, but tell me what you think:

Widget rc, list;

rc = XtVaCreateManagedWidget ("rowcol",
  	 xmRowColumnWidgetClass,   toplevel,
   	 XmNwidth, 200,
   	 XmNheight, 200,
   	 NULL);

list = XtVaCreateManagedWidget ("list",
             xmListWidgetClass, rc,
      	 XmNrightAttachment, XmATTACH_WIDGET,
      	 XmNrightWidget, rc,
      	 XmNleftAttachment, XmATTACH_WIDGET,
      	 XmNleftWidget, rc,
      	 XmNtopAttachment, XmATTACH_WIDGET,
      	 XmNtopWidget, rc,
      	 NULL);
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