/* Emacs manager widget.
   Copyright (C) 1993-1995 Sun Microsystems, Inc.
   Copyright (C) 1995 Ben Wing.

This file is part of XEmacs.

XEmacs is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

XEmacs is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: Not in FSF. */

/* Written by Ben Wing, May, 1994. */

#include <config.h>

#include <X11/StringDefs.h>
#include "EmacsManagerP.h"
#ifdef LWLIB_MENUBARS_MOTIF
#include <Xm/RowColumn.h>
#endif /* LWLIB_MENUBARS_MOTIF */

/* For I, Emacs, am a kind god.  Unlike the goddess Athena and the
   Titan Motif, I require no ritual sacrifices to placate the lesser
   daemons of geometry management. */

static XtResource resources[] = {
#define offset(field) XtOffset(EmacsManagerWidget, emacs_manager.field)
  { XtNresizeCallback, XtCCallback,
    XtRCallback, sizeof (XtCallbackList),
    offset(resize_callback), XtRImmediate, (XtPointer) 0 },
  { XtNqueryGeometryCallback, XtCCallback,
    XtRCallback, sizeof (XtCallbackList),
    offset(query_geometry_callback), XtRImmediate, (XtPointer) 0 },
  { XtNuserData, XtCUserData,
    XtRPointer, sizeof (XtPointer),
    offset(user_data), XtRImmediate, (XtPointer) 0 },
};

/****************************************************************
 *
 * Full class record constant
 *
 ****************************************************************/

static XtGeometryResult QueryGeometry (Widget wid,
				       XtWidgetGeometry *request,
				       XtWidgetGeometry *reply);
static void Resize (Widget w);
static XtGeometryResult GeometryManager (Widget w, XtWidgetGeometry *request,
					 XtWidgetGeometry *reply);
static void ChangeManaged (Widget w);
static void Realize (Widget w, Mask *valueMask,
		     XSetWindowAttributes *attributes);
static void ClassInitialize (void);

EmacsManagerClassRec emacsManagerClassRec = {
  {
/* core_class fields      */
#ifdef LWLIB_USES_MOTIF
    /* superclass         */    (WidgetClass) &xmManagerClassRec,
#else
    /* superclass         */    (WidgetClass) &compositeClassRec,
#endif
    /* class_name         */    "EmacsManager",
    /* widget_size        */    sizeof (EmacsManagerRec),
    /* class_initialize   */    ClassInitialize,
    /* class_part_init    */	NULL,
    /* class_inited       */	FALSE,
    /* initialize         */    NULL,
    /* initialize_hook    */	NULL,
    /* realize            */    Realize,
    /* actions            */    NULL,
    /* num_actions	  */	0,
    /* resources          */    resources,
    /* num_resources      */    XtNumber(resources),
    /* xrm_class          */    NULLQUARK,
    /* compress_motion	  */	TRUE,
    /* compress_exposure  */	XtExposeCompressMaximal | XtExposeNoRegion,
    /* compress_enterleave*/	TRUE,
    /* visible_interest   */    FALSE,
    /* destroy            */    NULL,
    /* resize             */    Resize,
    /* expose             */    NULL,
    /* set_values         */    NULL,
    /* set_values_hook    */	NULL,
    /* set_values_almost  */    XtInheritSetValuesAlmost,
    /* get_values_hook    */	NULL,
    /* accept_focus       */    NULL,
    /* version            */	XtVersion,
    /* callback_private   */    NULL,
    /* tm_table           */    XtInheritTranslations,
    /* query_geometry     */	QueryGeometry,
    /* display_accelerator*/	XtInheritDisplayAccelerator,
    /* extension          */	NULL
  },
  {
/* composite_class fields */
    /* geometry_manager   */    GeometryManager,
    /* change_managed     */    ChangeManaged,
    /* insert_child	  */	XtInheritInsertChild,
    /* delete_child	  */	XtInheritDeleteChild,
    /* extension          */	NULL
  },
#ifdef LWLIB_USES_MOTIF
  {
  /* constraint_class fields */
      NULL,                                     /* resource list        */
      0,                                        /* num resources        */
      0,                                        /* constraint size      */
      (XtInitProc)NULL,                         /* init proc            */
      (XtWidgetProc)NULL,                       /* destroy proc         */
      (XtSetValuesFunc)NULL,                    /* set values proc      */
      NULL,                                     /* extension            */
  },
  {
/* manager_class fields */
    XtInheritTranslations,			/* translations           */
    NULL,					/* syn_resources      	  */
    0,						/* num_syn_resources 	  */
    NULL,					/* syn_cont_resources     */
    0,						/* num_syn_cont_resources */
    XmInheritParentProcess,			/* parent_process         */
    NULL,					/* extension           	  */
  },
#endif
  {
/* emacs_manager_class fields */
    /* empty		  */	0,
  }
};

WidgetClass emacsManagerWidgetClass = (WidgetClass)&emacsManagerClassRec;

/* What is my preferred size?  A suggested size may be given. */

static XtGeometryResult
QueryGeometry (Widget w, XtWidgetGeometry *request, XtWidgetGeometry *reply)
{
  EmacsManagerWidget emw = (EmacsManagerWidget) w;
  EmacsManagerQueryGeometryStruct struc;
  int request_mode = request->request_mode;

  struc.request_mode = request_mode;
  struc.proposed_width  = (request_mode & CWWidth)  ? request->width  : 0;
  struc.proposed_height = (request_mode & CWHeight) ? request->height : 0;
  XtCallCallbackList (w, emw->emacs_manager.query_geometry_callback, &struc);
  reply->request_mode = CWWidth | CWHeight;
  reply->width  = struc.proposed_width;
  reply->height = struc.proposed_height;
  if (((request_mode & CWWidth)  && (request->width  != reply->width)) ||
      ((request_mode & CWHeight) && (request->height != reply->height)))
    return XtGeometryAlmost;
  return XtGeometryYes;
}

static void
Resize (Widget w)
{
  EmacsManagerWidget emw = (EmacsManagerWidget) w;
  EmacsManagerResizeStruct struc;

  struc.width  = w->core.width;
  struc.height = w->core.height;
  XtCallCallbackList (w, emw->emacs_manager.resize_callback, &struc);
}

static XtGeometryResult
GeometryManager (Widget w, XtWidgetGeometry *request, XtWidgetGeometry *reply)
{
  /* Sure, any changes are fine. */

#ifdef LWLIB_MENUBARS_MOTIF
  /* The Motif menubar will merrily request a new size every time a
     child is added or deleted.  Blow it off because it doesn't know
     what it's talking about. */
  if (XtClass (w) != xmRowColumnWidgetClass)
#endif /* LWLIB_MENUBARS_MOTIF */
    {
      if (request->request_mode & CWWidth)  w->core.width  = request->width;
      if (request->request_mode & CWHeight) w->core.height = request->height;
    }
  if (request->request_mode & CWBorderWidth)
    w->core.border_width = request->border_width;
  if (request->request_mode & CWX) w->core.x = request->x;
  if (request->request_mode & CWY) w->core.y = request->y;

  return XtGeometryYes;
}

static void
ChangeManaged (Widget w)
{
  if (!XtIsRealized (w))
    {
      XtWidgetGeometry request, reply;

      /* find out how big we'd like to be ... */

      request.request_mode = 0;
      XtQueryGeometry (w, &request, &reply);
      EmacsManagerChangeSize (w, reply.width, reply.height);
    }
}

static void
Realize (Widget w, Mask *valueMask, XSetWindowAttributes *attributes)
{
  attributes->bit_gravity = NorthWestGravity;
  *valueMask |= CWBitGravity;

  XtCreateWindow (w, (unsigned) InputOutput, (Visual *) CopyFromParent,
		  *valueMask, attributes);
}

static void
ClassInitialize (void)
{
  return;
}

void
EmacsManagerChangeSize (Widget w, Dimension width, Dimension height)
{
  if (width == 0)
    width = w->core.width;
  if (height == 0)
    height = w->core.height;

  /* do nothing if we're already that size */
  if (w->core.width != width || w->core.height != height)
    {
      XtGeometryResult result =
	XtMakeResizeRequest (w, width, height, &w->core.width, &w->core.height);
      if (result == XtGeometryNo)
	return;
      if (result == XtGeometryAlmost)
	XtMakeResizeRequest (w, w->core.width, w->core.height, NULL, NULL);
      Resize (w);
    }
}


