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From: mike@BACH.CS.BYU.EDU (Mike Burbidge)
Newsgroups: comp.windows.x
Subject: Motif DrawingArea widget seems to ignore XmNresizePolicy widget?
Message-ID: <9005312154.AA08275@bach.cs.byu.edu>
Date: 31 May 90 21:54:49 GMT
Article-I.D.: bach.9005312154.AA08275
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 76


The motif DrawingArea widget has a resource named XmNresizePolicy. The
documentation claims that it can be assigned three values: XmRESIZE_NONE,
XmRESIZE_ANY, XmRESIZE_GROW. I created a SelectionBox widget whose working
area widget is a DrawingArea widget with width and height 500 and
XmNresizePolicy set to XmRESIZE_NONE. The manual puts (fixed size) next to
XmRESIZE_NONE. I assume this means that the drawing area widget will ignore
resize requests from its parents. Either I have misunderstood the short two
word explaination for XmRESIZE_NONE, or else there is a bug somewhere. In
either event the SelectionBox widget resizes the DrawingArea widget to
20x20. Below a short example program.

----------------------------------------------------------------------
#include <stdio.h>
#include <X11/Intrinsic.h>
#include <Xm/Xm.h>
#include <X11/Shell.h>
#include <Xm/DialogS.h>
#include <Xm/Frame.h>
#include <Xm/SelectioB.h>
#include <Xm/DrawingA.h>
  
main (int argc, char *argv[])
{
  Display *display;
  Widget appl_shell, dialog, selection, draw;
  XtAppContext context;
  Arg args[10];
  int n;
  
  /* Initialize X11 and the Motif widget environment. */
  
  XtToolkitInitialize ();
  context = XtCreateApplicationContext ();
  display = XtOpenDisplay (context, NULL, argv[0], "try", 
			   NULL, 0, &argc, argv);
  appl_shell = XtAppCreateShell (argv[0], "Root try",
				 applicationShellWidgetClass, 
				 display, NULL, 0);
  XtResizeWidget (appl_shell, 5, 5, 1);

  n = 0;
  dialog = XmCreateDialogShell (appl_shell, "dialog", args, n);

  n = 0;
  XtSetArg (args[n], XmNdialogType, XmDIALOG_PROMPT), n++;
  selection = XtCreateWidget ("selection", xmSelectionBoxWidgetClass,
			      dialog, args, n);

  n = 0;
  XtSetArg (args[n], XmNheight, 500), n++;
  XtSetArg (args[n], XmNwidth, 500), n++;
  XtSetArg (args[n], XmNresizePolicy, XmRESIZE_NONE), n++;
  draw = XmCreateDrawingArea (selection, "draw", args, n);
  XtManageChild (draw);

  XtManageChild (XmSelectionBoxGetChild (selection, XmDIALOG_APPLY_BUTTON));
  XtUnmanageChild (XmSelectionBoxGetChild (selection, XmDIALOG_TEXT));
  XtUnmanageChild (XmSelectionBoxGetChild (selection, 
					   XmDIALOG_SELECTION_LABEL));
  XtUnmanageChild (XmSelectionBoxGetChild (selection, XmDIALOG_HELP_BUTTON));

  XtManageChild (selection);
  XtManageChild (dialog);

  XtRealizeWidget (dialog);
  
  XtAppMainLoop (context);
}
------------------------------------------------------------------

Could someone help me fix this program or give me an alternative so that the
DrawingArea widget does not get resized!

Mike Burbidge
mike@bach.cs.byu.edu