/* 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 "xmotif.h"
#include <Xm/RowColumn.h>
#endif /* LWLIB_MENUBARS_MOTIF */
#include "compiler.h"

/* 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 *UNUSED (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;

  /* #### AFAICT this gets called in two places.  One is in ChangeManaged(),
     above.  The other is in EmacsFrameResize().  Perhaps ChangeManaged()
     should initiate resize requests, but EmacsFrameResize() should not.
     Unfortunately, I've tried making this conditional on whether we're
     called from EmacsFrameResize() or not, but that results in an infloop
     via the callback to x_layout_widgets() in Resize().  Whee! */
  /* 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);
    }
}