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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:       2022-01-14 22:54:56
Message-ID: 1642200896.vjkuy9qhus448kss () webmail ! mycci ! net
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> 

> Message: 1
> Date: Wed, 12 Jan 2022 23:57:37 +0100
> From: Holger Sebert
> To: xorg@lists.x.org
> Subject: Re: Motif/Xt: Dynamically resize the visible item count of an
> XmList
> Message-ID: <08d618bb-c03e-4880-b332-c5e53ceb45bd@ruhr-uni-bochum.de>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
> 
> I have attached a small example program to illustrate the behavior.
> Just try to resize the main window and observe how the ScrolledList
> widget is NOT properly resized.
> 
> Maybe it's a feature, I don't know. But it looks like I'll have
> to write my own manager widget to accomplish the task.
> 
> Best,
> Holger
> 

I think you might be overthinking this a bit, here's something I just dashed off that \
I think might be along the lines of what you're looking for, (attached program), note \
you'll also need to link it to libXmu as I've added a call to support Editres.

Hopefully the attachment comes through...


["new_attach02.c" (text/x-c)]

#include <Xm/Form.h>
#include <Xm/ScrolledW.h>
#include <Xm/List.h>
#include <X11/Xmu/Editres.h>
#include <malloc.h>

char * months[] =
{
    "January", "February", "March", "April", "May", "June", "July",
    "August", "September", "October", "November", "December"
};

int main(int argc, char * argv[])
{
    XtAppContext app_context;
    Widget toplevel, form_w, scrolled_w, list_w;
    Arg av[10];
    Cardinal ac = 0;
    int n = XtNumber (months);
    XmStringTable str_list;

    str_list = (XmStringTable) XtMalloc (n * sizeof (XmString));

    XtSetLanguageProc(NULL, NULL, NULL);

    static XrmOptionDescRec options[] = 
    {
        { (char *) "-help", (char *) "*help", XrmoptionNoArg, (char *) "TRUE" }
    };

    toplevel = XtOpenApplication(
        &app_context,                /* app_context_return */
        "Chart-B.21",                /* from page 71 of Revere's book */
        options,                     /* options: None ATM */
        XtNumber(options),           /* num_options */
        &argc,                       /* argc_in_out */
        argv,                        /* argv_in_out_cluelessness */
        NULL,                        /* fallbackResources: None ATM */
        applicationShellWidgetClass, /* widget_class */
        av,                          /* args */
        ac);                         /* num_args */

    form_w = XtVaCreateManagedWidget((char *) "FormWindow",
        xmFormWidgetClass, toplevel,
        XmNheight,         400,
        XmNwidth,          400,
        NULL);

    scrolled_w = XtVaCreateManagedWidget((char *) "ScrolledWindow",
        xmScrolledWindowWidgetClass, form_w,
        XmNscrollingPolicy,          XmAUTOMATIC,
        XmNtopAttachment,            XmATTACH_WIDGET,
        XmNtopWidget,                form_w,
        /* XmNleftAttachment,           XmATTACH_WIDGET,
        XmNleftWidget,               form_w,
        XmNrightAttachment,          XmATTACH_WIDGET,
        XmNrightWidget,              form_w,*/
        XmNbottomAttachment,         XmATTACH_WIDGET,
        XmNbottomWidget,             form_w,
        NULL);

    for (int i = 0; i < n; i++)
        str_list[i] = XmStringCreateLocalized (months[i]);

    list_w = XtVaCreateManagedWidget((char *) "ListWindow",
    xmListWidgetClass,   scrolled_w,
    XmNvisibleItemCount, n,
    XmNitemCount,        n,
    XmNitems,            str_list,
    NULL);

    for (int i = 0; i < n; i++)
        XmStringFree (str_list[i]);
    free (str_list);

    XtAddEventHandler (toplevel, 0, 1, _XEditResCheckMessages, NULL);
    XtRealizeWidget   (toplevel);
    XtAppMainLoop     (app_context);

    return 0;
}


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