emacs/lwlib/lwlib-Xlw.c

/* The lwlib interface to "xlwmenu" menus.
   Copyright (C) 1992 Lucid, Inc.
   Copyright (C) 1994, 2000, 2001 Free Software Foundation, Inc.

This file is part of the Lucid Widget Library.

The Lucid Widget Library 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 1, or (at your option)
any later version.

The Lucid Widget Library 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 GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "lisp.h"

#include "lwlib-Xlw.h"
#include <X11/StringDefs.h>
#include <X11/IntrinsicP.h>
#include <X11/ObjectP.h>
#include <X11/CompositeP.h>
#include <X11/Shell.h>
#include "xlwmenu.h"

#if 0

#include <stdio.h>

/* Print the complete X resource name of widget WIDGET to stderr.
   This is sometimes handy to have available.  */

void
x_print_complete_resource_name (widget)
     Widget widget;
{
  int i;
  String names[100];

  for (i = 0; i < 100 && widget != NULL; ++i)
    {
      names[i] = XtName (widget);
      widget = XtParent (widget);
    }

  for (--i; i >= 1; --i)
    fprintf (stderr, "%s.", names[i]);
  fprintf (stderr, "%s\n", names[0]);
}

#endif /* 0 */


/* Menu callbacks */

/* Callback XtNhighlightCallback for Lucid menus.  W is the menu
   widget, CLIENT_DATA contains a pointer to the widget_instance
   for the menu, CALL_DATA contains a pointer to the widget_value
   structure for the highlighted menu item.  The latter may be null
   if there isn't any highlighted menu item.  */

static void
highlight_hook (w, client_data, call_data)
     Widget w;
     XtPointer client_data;
     XtPointer call_data;
{
  widget_instance *instance = (widget_instance *) client_data;

  if (instance->info->highlight_cb
      && !w->core.being_destroyed)
    instance->info->highlight_cb (w, instance->info->id, call_data);
}

static void
pre_hook (w, client_data, call_data)
     Widget w;
     XtPointer client_data;
     XtPointer call_data;
{
  widget_instance* instance = (widget_instance*)client_data;
  widget_value* val;

  if (w->core.being_destroyed)
    return;

  val = lw_get_widget_value_for_widget (instance, w);
  if (instance->info->pre_activate_cb)
    instance->info->pre_activate_cb (w, instance->info->id,
				     val ? val->call_data : NULL);
}

static void
pick_hook (w, client_data, call_data)
     Widget w;
     XtPointer client_data;
     XtPointer call_data;
{
  widget_instance* instance = (widget_instance*)client_data;
  widget_value* contents_val = (widget_value*)call_data;
  widget_value* widget_val;
  XtPointer widget_arg;

  if (w->core.being_destroyed)
    return;

  if (instance->info->selection_cb && contents_val && contents_val->enabled
      && !contents_val->contents)
    instance->info->selection_cb (w, instance->info->id,
				  contents_val->call_data);

  widget_val = lw_get_widget_value_for_widget (instance, w);
  widget_arg = widget_val ? widget_val->call_data : NULL;
  if (instance->info->post_activate_cb)
    instance->info->post_activate_cb (w, instance->info->id, widget_arg);

}

/* creation functions */

static Widget
xlw_create_menubar (instance)
     widget_instance* instance;
{
  Widget widget;
  Arg al[5];
  int ac = 0;

  XtSetArg (al[ac], XtNmenu, instance->info->val); ac++;
#ifdef emacs
  XtSetArg (al[ac], XtNshowGrip, 0); ac++;
  XtSetArg (al[ac], XtNresizeToPreferred, 1); ac++;
  XtSetArg (al[ac], XtNallowResize, 1); ac++;
#endif

  /* This used to use XtVaCreateWidget, but an old Xt version
     has a bug in XtVaCreateWidget that frees instance->info->name.  */
  widget
    = XtCreateWidget (instance->info->name, xlwMenuWidgetClass,
		      instance->parent, al, ac);

  XtAddCallback (widget, XtNopen, pre_hook, (XtPointer)instance);
  XtAddCallback (widget, XtNselect, pick_hook, (XtPointer)instance);
  XtAddCallback (widget, XtNhighlightCallback, highlight_hook,
		 (XtPointer)instance);
  return widget;
}

static Widget
xlw_create_popup_menu (instance)
     widget_instance* instance;
{
  Widget popup_shell
    = XtCreatePopupShell (instance->info->name, overrideShellWidgetClass,
			  instance->parent, NULL, 0);

  Widget widget;
  Arg al[2];
  int ac = 0;

  XtSetArg (al[ac], XtNmenu, instance->info->val); ac++;
  XtSetArg (al[ac], XtNhorizontal, False); ac++;

  /* This used to use XtVaManagedCreateWidget, but an old Xt version
     has a bug in XtVaManagedCreateWidget that frees instance->info->name.  */
  widget
    = XtCreateManagedWidget ("popup", xlwMenuWidgetClass,
			     popup_shell, al, ac);

  XtAddCallback (widget, XtNselect, pick_hook, (XtPointer)instance);
  XtAddCallback (widget, XtNhighlightCallback, highlight_hook,
		 (XtPointer)instance);
  return popup_shell;
}

widget_creation_entry
xlw_creation_table [] =
{
  {"menubar", xlw_create_menubar},
  {"popup", xlw_create_popup_menu},
  {NULL, NULL}
};

Boolean
lw_lucid_widget_p (widget)
     Widget widget;
{
  WidgetClass the_class = XtClass (widget);

  if (the_class == xlwMenuWidgetClass)
    return True;
  if (the_class == overrideShellWidgetClass)
    return (XtClass (((CompositeWidget)widget)->composite.children [0])
	    == xlwMenuWidgetClass);
  return False;
}

void
#ifdef PROTOTYPES
xlw_update_one_widget (widget_instance* instance, Widget widget,
		       widget_value* val, Boolean deep_p)
#else
xlw_update_one_widget (instance, widget, val, deep_p)
     widget_instance* instance;
     Widget widget;
     widget_value* val;
     Boolean deep_p;
#endif
{
  Arg al[1];

  /* This used to use XtVaSetValues, but some old Xt versions
     that have a bug in XtVaCreateWidget might have it here too.  */
  XtSetArg (al[0], XtNmenu, instance->info->val);

  XtSetValues (widget, al, 1);
}

void
xlw_update_one_value (instance, widget, val)
     widget_instance* instance;
     Widget widget;
     widget_value* val;
{
  return;
}

void
#ifdef PROTOTYPES
xlw_pop_instance (widget_instance* instance, Boolean up)
#else
xlw_pop_instance (instance, up)
     widget_instance* instance;
     Boolean up;
#endif
{
}

void
xlw_popup_menu (widget, event)
     Widget widget;
     XEvent *event;
{
  XButtonPressedEvent dummy;
  XlwMenuWidget mw;

  if (!XtIsShell (widget))
    return;

  mw = (XlwMenuWidget)((CompositeWidget)widget)->composite.children [0];

  if (event)
    pop_up_menu (mw, (XButtonPressedEvent*) event);
  else
    {
      dummy.type = ButtonPress;
      dummy.serial = 0;
      dummy.send_event = 0;
      dummy.display = XtDisplay (widget);
      dummy.window = XtWindow (XtParent (widget));
      dummy.time = CurrentTime;
      dummy.button = 0;
      XQueryPointer (dummy.display, dummy.window, &dummy.root,
		     &dummy.subwindow, &dummy.x_root, &dummy.y_root,
		     &dummy.x, &dummy.y, &dummy.state);

      pop_up_menu (mw, &dummy);
    }
}

/* Destruction of instances */
void
xlw_destroy_instance (instance)
     widget_instance* instance;
{
  if (instance->widget)
    XtDestroyWidget (instance->widget);
}