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/* GDK - The GIMP Drawing Kit
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 * gdkdisplay.c
 * 
 * Copyright 2001 Sun Microsystems Inc. 
 *
 * Erwann Chenede <erwann.chenede@sun.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

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#include "config.h"
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#include <math.h>
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#include <glib.h>
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#include "gdk.h"		/* gdk_event_send_client_message() */
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#include "gdkdisplay.h"
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#include "gdkwindowimpl.h"
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#include "gdkinternals.h"
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#include "gdkmarshalers.h"
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#include "gdkscreen.h"
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#include "gdkalias.h"
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enum {
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  OPENED,
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  CLOSED,
  LAST_SIGNAL
};

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static void gdk_display_dispose     (GObject         *object);
static void gdk_display_finalize    (GObject         *object);

static void        multihead_get_device_state           (GdkDisplay       *display,
                                                         GdkDevice        *device,
                                                         GdkScreen       **screen,
                                                         gint             *x,
                                                         gint             *y,
                                                         GdkModifierType  *mask);
static GdkWindow * multihead_window_get_device_position (GdkDisplay       *display,
                                                         GdkDevice        *device,
                                                         GdkWindow        *window,
                                                         gint             *x,
                                                         gint             *y,
                                                         GdkModifierType  *mask);
static GdkWindow * multihead_window_at_device_position  (GdkDisplay       *display,
                                                         GdkDevice        *device,
                                                         gint             *win_x,
                                                         gint             *win_y);

static void        multihead_default_get_pointer        (GdkDisplay       *display,
                                                         GdkScreen       **screen,
                                                         gint             *x,
                                                         gint             *y,
                                                         GdkModifierType  *mask);
static GdkWindow * multihead_default_window_get_pointer (GdkDisplay      *display,
                                                         GdkWindow       *window,
                                                         gint            *x,
                                                         gint            *y,
                                                         GdkModifierType *mask);
static GdkWindow * multihead_default_window_at_pointer  (GdkDisplay      *display,
                                                         gint            *win_x,
                                                         gint            *win_y);
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static void       singlehead_get_pointer (GdkDisplay       *display,
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					  GdkScreen       **screen,
					  gint             *x,
					  gint             *y,
					  GdkModifierType  *mask);
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static GdkWindow* singlehead_window_get_pointer (GdkDisplay       *display,
						 GdkWindow        *window,
						 gint             *x,
						 gint             *y,
						 GdkModifierType  *mask);
static GdkWindow* singlehead_window_at_pointer  (GdkDisplay       *display,
						 gint             *win_x,
						 gint             *win_y);

static GdkWindow* singlehead_default_window_get_pointer (GdkWindow       *window,
							 gint            *x,
							 gint            *y,
							 GdkModifierType *mask);
static GdkWindow* singlehead_default_window_at_pointer  (GdkScreen       *screen,
							 gint            *win_x,
							 gint            *win_y);
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static GdkWindow *gdk_window_real_window_get_device_position     (GdkDisplay       *display,
                                                                  GdkDevice        *device,
                                                                  GdkWindow        *window,
                                                                  gint             *x,
                                                                  gint             *y,
                                                                  GdkModifierType  *mask);
static GdkWindow *gdk_display_real_get_window_at_device_position (GdkDisplay       *display,
                                                                  GdkDevice        *device,
                                                                  gint             *win_x,
                                                                  gint             *win_y);
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static guint signals[LAST_SIGNAL] = { 0 };

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static char *gdk_sm_client_id;
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static const GdkDisplayDeviceHooks default_device_hooks = {
  _gdk_windowing_get_device_state,
  gdk_window_real_window_get_device_position,
  gdk_display_real_get_window_at_device_position
};

static const GdkDisplayDeviceHooks multihead_pointer_hooks = {
  multihead_get_device_state,
  multihead_window_get_device_position,
  multihead_window_at_device_position
};

static const GdkDisplayPointerHooks multihead_default_pointer_hooks = {
  multihead_default_get_pointer,
  multihead_default_window_get_pointer,
  multihead_default_window_at_pointer
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};

static const GdkDisplayPointerHooks singlehead_pointer_hooks = {
  singlehead_get_pointer,
  singlehead_window_get_pointer,
  singlehead_window_at_pointer
};

static const GdkPointerHooks singlehead_default_pointer_hooks = {
  singlehead_default_window_get_pointer,
  singlehead_default_window_at_pointer
};

static const GdkPointerHooks *singlehead_current_pointer_hooks = &singlehead_default_pointer_hooks;
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static const GdkDisplayPointerHooks *multihead_current_pointer_hooks = &multihead_default_pointer_hooks;
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G_DEFINE_TYPE (GdkDisplay, gdk_display, G_TYPE_OBJECT)
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static void
gdk_display_class_init (GdkDisplayClass *class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);
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  object_class->finalize = gdk_display_finalize;
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  object_class->dispose = gdk_display_dispose;
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  /**
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   * GdkDisplay::opened:
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   * @display: the object on which the signal is emitted
   *
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   * The ::opened signal is emitted when the connection to the windowing
   * system for @display is opened.
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   */
  signals[OPENED] =
    g_signal_new (g_intern_static_string ("opened"),
		  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  0, NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

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  /**
   * GdkDisplay::closed:
   * @display: the object on which the signal is emitted
   * @is_error: %TRUE if the display was closed due to an error
   *
   * The ::closed signal is emitted when the connection to the windowing
   * system for @display is closed.
   *
   * Since: 2.2
   */   
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  signals[CLOSED] =
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    g_signal_new (g_intern_static_string ("closed"),
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		  G_OBJECT_CLASS_TYPE (object_class),
		  G_SIGNAL_RUN_LAST,
		  G_STRUCT_OFFSET (GdkDisplayClass, closed),
		  NULL, NULL,
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		  _gdk_marshal_VOID__BOOLEAN,
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		  G_TYPE_NONE,
		  1,
		  G_TYPE_BOOLEAN);
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}

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static void
free_pointer_info (GdkPointerWindowInfo *info)
{
  g_object_unref (info->toplevel_under_pointer);
  g_slice_free (GdkPointerWindowInfo, info);
}

static void
free_device_grab (GdkDeviceGrabInfo *info)
{
  g_object_unref (info->window);
  g_object_unref (info->native_window);
  g_free (info);
}

static gboolean
free_device_grabs_foreach (gpointer key,
                           gpointer value,
                           gpointer user_data)
{
  GList *list = value;

  g_list_foreach (list, (GFunc) free_device_grab, NULL);
  g_list_free (list);

  return TRUE;
}

static void
device_removed_cb (GdkDeviceManager *device_manager,
                   GdkDevice        *device,
                   GdkDisplay       *display)
{
  g_hash_table_remove (display->multiple_click_info, device);
  g_hash_table_remove (display->device_grabs, device);
  g_hash_table_remove (display->pointers_info, device);

  /* FIXME: change core pointer and remove from device list */
}

static void
gdk_display_opened (GdkDisplay *display)
{
  GdkDeviceManager *device_manager;

  device_manager = gdk_display_get_device_manager (display);

  g_signal_connect (device_manager, "device-removed",
                    G_CALLBACK (device_removed_cb), display);
}

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static void
gdk_display_init (GdkDisplay *display)
{
  _gdk_displays = g_slist_prepend (_gdk_displays, display);

  display->double_click_time = 250;
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  display->double_click_distance = 5;
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  display->device_hooks = &default_device_hooks;

  display->device_grabs = g_hash_table_new (NULL, NULL);
  display->motion_hint_info = g_hash_table_new_full (NULL, NULL, NULL,
                                                     (GDestroyNotify) g_free);

  display->pointers_info = g_hash_table_new_full (NULL, NULL, NULL,
                                                  (GDestroyNotify) free_pointer_info);

  display->multiple_click_info = g_hash_table_new_full (NULL, NULL, NULL,
                                                        (GDestroyNotify) g_free);

  g_signal_connect (display, "opened",
                    G_CALLBACK (gdk_display_opened), NULL);
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}

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static void
gdk_display_dispose (GObject *object)
{
  GdkDisplay *display = GDK_DISPLAY_OBJECT (object);
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  GdkDeviceManager *device_manager;

  device_manager = gdk_display_get_device_manager (GDK_DISPLAY_OBJECT (object));
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  g_list_foreach (display->queued_events, (GFunc)gdk_event_free, NULL);
  g_list_free (display->queued_events);
  display->queued_events = NULL;
  display->queued_tail = NULL;

  _gdk_displays = g_slist_remove (_gdk_displays, object);

  if (gdk_display_get_default() == display)
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    {
      if (_gdk_displays)
        gdk_display_manager_set_default_display (gdk_display_manager_get(),
                                                 _gdk_displays->data);
      else
        gdk_display_manager_set_default_display (gdk_display_manager_get(),
                                                 NULL);
    }
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  if (device_manager)
    g_signal_handlers_disconnect_by_func (device_manager, device_removed_cb, object);

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  G_OBJECT_CLASS (gdk_display_parent_class)->dispose (object);
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}

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static void
gdk_display_finalize (GObject *object)
{
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  GdkDisplay *display = GDK_DISPLAY_OBJECT (object);

  g_hash_table_foreach_remove (display->device_grabs,
                               free_device_grabs_foreach,
                               NULL);
  g_hash_table_destroy (display->device_grabs);

  g_hash_table_destroy (display->pointers_info);
  g_hash_table_destroy (display->multiple_click_info);

  if (display->device_manager)
    g_object_unref (display->device_manager);

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  G_OBJECT_CLASS (gdk_display_parent_class)->finalize (object);
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}

/**
 * gdk_display_close:
 * @display: a #GdkDisplay
 *
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 * Closes the connection to the windowing system for the given display,
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 * and cleans up associated resources.
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 *
 * Since: 2.2
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 */
void
gdk_display_close (GdkDisplay *display)
{
  g_return_if_fail (GDK_IS_DISPLAY (display));
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  if (!display->closed)
    {
      display->closed = TRUE;
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      g_signal_emit (display, signals[CLOSED], 0, FALSE);
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      g_object_run_dispose (G_OBJECT (display));
      
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      g_object_unref (display);
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    }
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}

/**
 * gdk_display_get_event:
 * @display: a #GdkDisplay
 * 
 * Gets the next #GdkEvent to be processed for @display, fetching events from the
 * windowing system if necessary.
 * 
 * Return value: the next #GdkEvent to be processed, or %NULL if no events
 * are pending. The returned #GdkEvent should be freed with gdk_event_free().
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 *
 * Since: 2.2
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 **/
GdkEvent*
gdk_display_get_event (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
  
  _gdk_events_queue (display);
  return _gdk_event_unqueue (display);
}

/**
 * gdk_display_peek_event:
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 * @display: a #GdkDisplay 
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 * 
 * Gets a copy of the first #GdkEvent in the @display's event queue, without
 * removing the event from the queue.  (Note that this function will
 * not get more events from the windowing system.  It only checks the events
 * that have already been moved to the GDK event queue.)
 * 
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 * Return value: a copy of the first #GdkEvent on the event queue, or %NULL 
 * if no events are in the queue. The returned #GdkEvent should be freed with
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 * gdk_event_free().
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 *
 * Since: 2.2
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 **/
GdkEvent*
gdk_display_peek_event (GdkDisplay *display)
{
  GList *tmp_list;

  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);

  tmp_list = _gdk_event_queue_find_first (display);
  
  if (tmp_list)
    return gdk_event_copy (tmp_list->data);
  else
    return NULL;
}

/**
 * gdk_display_put_event:
 * @display: a #GdkDisplay
 * @event: a #GdkEvent.
 *
 * Appends a copy of the given event onto the front of the event
 * queue for @display.
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 *
 * Since: 2.2
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 **/
void
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gdk_display_put_event (GdkDisplay     *display,
		       const GdkEvent *event)
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{
  g_return_if_fail (GDK_IS_DISPLAY (display));
  g_return_if_fail (event != NULL);

  _gdk_event_queue_append (display, gdk_event_copy (event));
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  /* If the main loop is blocking in a different thread, wake it up */
  g_main_context_wakeup (NULL); 
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}
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/**
 * gdk_display_pointer_ungrab:
 * @display: a #GdkDisplay.
 * @time_: a timestap (e.g. %GDK_CURRENT_TIME).
 *
 * Release any pointer grab.
 *
 * Since: 2.2
 *
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 * Deprecated: 3.0: Use gdk_device_ungrab(), together with gdk_device_grab()
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 *             instead.
 */
void
gdk_display_pointer_ungrab (GdkDisplay *display,
			    guint32     time_)
{
  GdkDeviceManager *device_manager;
  GList *devices, *dev;
  GdkDevice *device;

  g_return_if_fail (GDK_IS_DISPLAY (display));

  device_manager = gdk_display_get_device_manager (display);
  devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_MASTER);

  /* FIXME: Should this be generic to all backends? */
  /* FIXME: What happens with extended devices? */
  for (dev = devices; dev; dev = dev->next)
    {
      device = dev->data;

      if (device->source != GDK_SOURCE_MOUSE)
        continue;

      gdk_device_ungrab (device, time_);
    }

  g_list_free (devices);
}

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/**
 * gdk_pointer_ungrab:
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 * @time_: a timestamp from a #GdkEvent, or %GDK_CURRENT_TIME if no 
 *  timestamp is available.
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 *
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 * Ungrabs the pointer on the default display, if it is grabbed by this 
 * application.
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 *
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 * Deprecated: 3.0: Use gdk_device_ungrab(), together with gdk_device_grab()
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 *             instead.
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 **/
void
gdk_pointer_ungrab (guint32 time)
{
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  gdk_display_pointer_ungrab (gdk_display_get_default (), time);
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}

/**
 * gdk_pointer_is_grabbed:
 * 
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 * Returns %TRUE if the pointer on the default display is currently 
 * grabbed by this application.
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 *
 * Note that this does not take the inmplicit pointer grab on button
 * presses into account.
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 *
 * Return value: %TRUE if the pointer is currently grabbed by this application.
 *
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 * Deprecated: 3.0: Use gdk_display_device_is_grabbed() instead.
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 **/
gboolean
gdk_pointer_is_grabbed (void)
{
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  return gdk_display_pointer_is_grabbed (gdk_display_get_default ());
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}

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/**
 * gdk_display_keyboard_ungrab:
 * @display: a #GdkDisplay.
 * @time_: a timestap (e.g #GDK_CURRENT_TIME).
 *
 * Release any keyboard grab
 *
 * Since: 2.2
 *
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 * Deprecated: 3.0: Use gdk_device_ungrab(), together with gdk_device_grab()
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 *             instead.
 */
void
gdk_display_keyboard_ungrab (GdkDisplay *display,
			     guint32     time)
{
  GdkDeviceManager *device_manager;
  GList *devices, *dev;
  GdkDevice *device;

  g_return_if_fail (GDK_IS_DISPLAY (display));

  device_manager = gdk_display_get_device_manager (display);
  devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_MASTER);

  /* FIXME: Should this be generic to all backends? */
  /* FIXME: What happens with extended devices? */
  for (dev = devices; dev; dev = dev->next)
    {
      device = dev->data;

      if (device->source != GDK_SOURCE_KEYBOARD)
        continue;

      gdk_device_ungrab (device, time);
    }

  g_list_free (devices);
}

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/**
 * gdk_keyboard_ungrab:
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 * @time_: a timestamp from a #GdkEvent, or %GDK_CURRENT_TIME if no
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 *        timestamp is available.
 * 
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 * Ungrabs the keyboard on the default display, if it is grabbed by this 
 * application.
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 *
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 * Deprecated: 3.0: Use gdk_device_ungrab(), together with gdk_device_grab()
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 *             instead.
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 **/
void
gdk_keyboard_ungrab (guint32 time)
{
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  gdk_display_keyboard_ungrab (gdk_display_get_default (), time);
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}

/**
 * gdk_beep:
 * 
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 * Emits a short beep on the default display.
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 **/
void
gdk_beep (void)
{
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  gdk_display_beep (gdk_display_get_default ());
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}

/**
 * gdk_event_send_client_message:
 * @event: the #GdkEvent to send, which should be a #GdkEventClient.
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 * @winid:  the window to send the X ClientMessage event to.
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 * 
 * Sends an X ClientMessage event to a given window (which must be
 * on the default #GdkDisplay.)
 * This could be used for communicating between different applications,
 * though the amount of data is limited to 20 bytes.
 * 
 * Return value: non-zero on success.
 **/
gboolean
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gdk_event_send_client_message (GdkEvent        *event,
			       GdkNativeWindow  winid)
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{
  g_return_val_if_fail (event != NULL, FALSE);

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  return gdk_event_send_client_message_for_display (gdk_display_get_default (),
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						    event, winid);
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}

/**
 * gdk_event_send_clientmessage_toall:
 * @event: the #GdkEvent to send, which should be a #GdkEventClient.
 *
 * Sends an X ClientMessage event to all toplevel windows on the default
 * #GdkScreen.
 *
 * Toplevel windows are determined by checking for the WM_STATE property, as
 * described in the Inter-Client Communication Conventions Manual (ICCCM).
 * If no windows are found with the WM_STATE property set, the message is sent
 * to all children of the root window.
 **/
void
gdk_event_send_clientmessage_toall (GdkEvent *event)
{
  g_return_if_fail (event != NULL);

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  gdk_screen_broadcast_client_message (gdk_screen_get_default (), event);
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}

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/**
 * gdk_device_get_core_pointer:
 * 
 * Returns the core pointer device for the default display.
 * 
 * Return value: the core pointer device; this is owned by the
 *   display and should not be freed.
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 *
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 * Deprecated: 3.0: Use gdk_display_get_client_pointer() instead, or
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 *             gdk_event_get_device() if a #GdkEvent with pointer device
 *             information is available.
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 **/
GdkDevice *
gdk_device_get_core_pointer (void)
{
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  return gdk_display_get_core_pointer (gdk_display_get_default ());
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}

/**
 * gdk_display_get_core_pointer:
 * @display: a #GdkDisplay
 * 
 * Returns the core pointer device for the given display
 * 
 * Return value: the core pointer device; this is owned by the
 *   display and should not be freed.
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 *
 * Since: 2.2
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 *
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 * Deprecated: 3.0: Use gdk_display_get_client_pointer() instead, or
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 *             gdk_event_get_device() if a #GdkEvent with device
 *             information is available.
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 **/
GdkDevice *
gdk_display_get_core_pointer (GdkDisplay *display)
{
  return display->core_pointer;
}
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/**
 * gdk_set_sm_client_id:
 * @sm_client_id: the client id assigned by the session manager when the
 *    connection was opened, or %NULL to remove the property.
 * 
 * Sets the <literal>SM_CLIENT_ID</literal> property on the application's leader window so that
 * the window manager can save the application's state using the X11R6 ICCCM
 * session management protocol.
 *
 * See the X Session Management Library documentation for more information on
 * session management and the Inter-Client Communication Conventions Manual
 * (ICCCM) for information on the <literal>WM_CLIENT_LEADER</literal> property. 
 * (Both documents are part of the X Window System distribution.)
 **/
void
gdk_set_sm_client_id (const gchar* sm_client_id)
{
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  GSList *displays, *tmp_list;
  
  g_free (gdk_sm_client_id);
  gdk_sm_client_id = g_strdup (sm_client_id);

  displays = gdk_display_manager_list_displays (gdk_display_manager_get ());
  for (tmp_list = displays; tmp_list; tmp_list = tmp_list->next)
    _gdk_windowing_display_set_sm_client_id (tmp_list->data, sm_client_id);

  g_slist_free (displays);
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}

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/**
 * _gdk_get_sm_client_id:
 * 
 * Gets the client ID set with gdk_set_sm_client_id(), if any.
 * 
 * Return value: Session ID, or %NULL if gdk_set_sm_client_id()
 *               has never been called.
 **/
const char *
_gdk_get_sm_client_id (void)
{
  return gdk_sm_client_id;
}
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void
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_gdk_display_enable_motion_hints (GdkDisplay *display,
                                  GdkDevice  *device)
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{
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  gulong *device_serial, serial;

  device_serial = g_hash_table_lookup (display->motion_hint_info, device);

  if (!device_serial)
    {
      device_serial = g_new0 (gulong, 1);
      *device_serial = G_MAXULONG;
      g_hash_table_insert (display->motion_hint_info, device, device_serial);
    }

  if (*device_serial != 0)
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    {
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      serial = _gdk_windowing_window_get_next_serial (display);
      /* We might not actually generate the next request, so
	 make sure this triggers always, this may cause it to
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	 trigger slightly too early, but this is just a hint
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	 anyway. */
      if (serial > 0)
	serial--;
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      if (serial < *device_serial)
	*device_serial = serial;
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    }
}

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/**
 * gdk_display_get_device_state:
 * @display: a #GdkDisplay.
 * @device: device to query status to.
 * @screen: location to store the #GdkScreen the @device is on, or %NULL.
 * @x: location to store root window X coordinate of @device, or %NULL.
 * @y: location to store root window Y coordinate of @device, or %NULL.
 * @mask: location to store current modifier mask for @device, or %NULL.
 *
 * Gets the current location and state of @device for a given display.
 *
 * Since: 3.0
 **/
void
gdk_display_get_device_state (GdkDisplay       *display,
                              GdkDevice        *device,
                              GdkScreen       **screen,
                              gint             *x,
                              gint             *y,
                              GdkModifierType  *mask)
{
  GdkScreen *tmp_screen;
  gint tmp_x, tmp_y;
  GdkModifierType tmp_mask;

  g_return_if_fail (GDK_IS_DISPLAY (display));
  g_return_if_fail (GDK_IS_DEVICE (device));

  display->device_hooks->get_device_state (display, device, &tmp_screen, &tmp_x, &tmp_y, &tmp_mask);

  if (screen)
    *screen = tmp_screen;
  if (x)
    *x = tmp_x;
  if (y)
    *y = tmp_y;
  if (mask)
    *mask = tmp_mask;
}

/**
 * gdk_display_get_window_at_device_position:
 * @display: a #GdkDisplay.
 * @device: #GdkDevice to query info to.
 * @win_x: return location for the X coordinate of the device location, relative to the window origin, or %NULL.
 * @win_y: return location for the Y coordinate of the device location, relative to the window origin, or %NULL.
 *
 * Obtains the window underneath @device, returning the location of the device in @win_x and @win_y. Returns
 * %NULL if the window tree under @device is not known to GDK (for example, belongs to another application).
 *
 * Returns: the #GdkWindow under the device position, or %NULL.
 *
 * Since: 3.0
 **/
GdkWindow *
gdk_display_get_window_at_device_position (GdkDisplay *display,
                                           GdkDevice  *device,
                                           gint       *win_x,
                                           gint       *win_y)
{
  gint tmp_x, tmp_y;
  GdkWindow *window;

  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
  g_return_val_if_fail (GDK_IS_DEVICE (device), NULL);

  window = display->device_hooks->window_at_device_position (display, device, &tmp_x, &tmp_y);

  if (win_x)
    *win_x = tmp_x;
  if (win_y)
    *win_y = tmp_y;

  return window;
}

/**
 * gdk_display_set_device_hooks:
 * @display: a #GdkDisplay.
 * @new_hooks: a table of pointers to functions for getting quantities related to all
 *             devices position, or %NULL to restore the default table.
 *
 * This function allows for hooking into the operation of getting the current location of any
 * #GdkDevice on a particular #GdkDisplay. This is only useful for such low-level tools as
 * an event recorder. Applications should never have any reason to use this facility.
 *
 * Returns: The previous device hook table.
 *
 * Since: 3.0
 **/
GdkDisplayDeviceHooks *
gdk_display_set_device_hooks (GdkDisplay                  *display,
                              const GdkDisplayDeviceHooks *new_hooks)
{
  const GdkDisplayDeviceHooks *result;

  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
  result = display->device_hooks;

  if (new_hooks)
    display->device_hooks = new_hooks;
  else
    display->device_hooks = &default_device_hooks;

  return (GdkDisplayDeviceHooks *) result;
}

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/**
 * gdk_display_get_pointer:
 * @display: a #GdkDisplay
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 * @screen: (allow-none): location to store the screen that the
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 *          cursor is on, or %NULL.
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 * @x: (out) (allow-none): location to store root window X coordinate of pointer, or %NULL.
 * @y: (out) (allow-none): location to store root window Y coordinate of pointer, or %NULL.
 * @mask: (out) (allow-none): location to store current modifier mask, or %NULL
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 *
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 * Gets the current location of the pointer and the current modifier
 * mask for a given display.
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 *
 * Since: 2.2
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 *
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 * Deprecated: 3.0: Use gdk_display_get_device_state() instead.
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 **/
void
gdk_display_get_pointer (GdkDisplay      *display,
			 GdkScreen      **screen,
			 gint            *x,
			 gint            *y,
			 GdkModifierType *mask)
{
  g_return_if_fail (GDK_IS_DISPLAY (display));

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  gdk_display_get_device_state (display, display->core_pointer, screen, x, y, mask);
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}

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static GdkWindow *
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gdk_display_real_get_window_at_device_position (GdkDisplay *display,
                                                GdkDevice  *device,
                                                gint       *win_x,
                                                gint       *win_y)
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{
  GdkWindow *window;
  gint x, y;

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  window = _gdk_windowing_window_at_device_position (display, device, &x, &y, NULL, FALSE);
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  /* This might need corrections, as the native window returned
     may contain client side children */
  if (window)
    {
      double xx, yy;
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      window = _gdk_window_find_descendant_at (window,
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					       x, y,
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					       &xx, &yy);
      x = floor (xx + 0.5);
      y = floor (yy + 0.5);
    }
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  *win_x = x;
  *win_y = y;
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  return window;
}

static GdkWindow *
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gdk_window_real_window_get_device_position (GdkDisplay       *display,
                                            GdkDevice        *device,
                                            GdkWindow        *window,
                                            gint             *x,
                                            gint             *y,
                                            GdkModifierType  *mask)
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{
  GdkWindowObject *private;
  gint tmpx, tmpy;
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  GdkModifierType tmp_mask;
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  gboolean normal_child;
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  private = (GdkWindowObject *) window;

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  normal_child = GDK_WINDOW_IMPL_GET_IFACE (private->impl)->get_device_state (window,
                                                                              device,
                                                                              &tmpx, &tmpy,
                                                                              &tmp_mask);
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  /* We got the coords on the impl, convert to the window */
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  tmpx -= private->abs_x;
  tmpy -= private->abs_y;
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  if (x)
    *x = tmpx;
  if (y)
    *y = tmpy;
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  if (mask)
    *mask = tmp_mask;
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  if (normal_child)
    return _gdk_window_find_child_at (window, tmpx, tmpy);
  return NULL;
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}

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/**
 * gdk_display_get_window_at_pointer:
 * @display: a #GdkDisplay
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 * @win_x: (out) (allow-none): return location for x coordinate of the pointer location relative
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 *    to the window origin, or %NULL
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 * @win_y: (out) (allow-none): return location for y coordinate of the pointer location relative
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 &    to the window origin, or %NULL
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 *
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 * Obtains the window underneath the mouse pointer, returning the location
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 * of the pointer in that window in @win_x, @win_y for @screen. Returns %NULL
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 * if the window under the mouse pointer is not known to GDK (for example, 
 * belongs to another application).
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 *
 * Returns: (transfer none): the window under the mouse pointer, or %NULL
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 *
 * Since: 2.2
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 *
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 * Deprecated: 3.0: Use gdk_display_get_window_at_device_position() instead.
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 **/
GdkWindow *
gdk_display_get_window_at_pointer (GdkDisplay *display,
				   gint       *win_x,
				   gint       *win_y)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
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  return gdk_display_get_window_at_device_position (display, display->core_pointer, win_x, win_y);
}
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static void
multihead_get_device_state (GdkDisplay       *display,
                            GdkDevice        *device,
                            GdkScreen       **screen,
                            gint             *x,
                            gint             *y,
                            GdkModifierType  *mask)
{
  multihead_current_pointer_hooks->get_pointer (display, screen, x, y, mask);
}
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static GdkWindow *
multihead_window_get_device_position (GdkDisplay      *display,
                                      GdkDevice       *device,
                                      GdkWindow       *window,
                                      gint            *x,
                                      gint            *y,
                                      GdkModifierType *mask)
{
  return multihead_current_pointer_hooks->window_get_pointer (display, window, x, y, mask);
}

static GdkWindow *
multihead_window_at_device_position (GdkDisplay *display,
                                     GdkDevice  *device,
                                     gint       *win_x,
                                     gint       *win_y)
{
  return multihead_current_pointer_hooks->window_at_pointer (display, win_x, win_y);
}

static void
multihead_default_get_pointer (GdkDisplay       *display,
                               GdkScreen       **screen,
                               gint             *x,
                               gint             *y,
                               GdkModifierType  *mask)
{
  return _gdk_windowing_get_device_state (display,
                                          display->core_pointer,
                                          screen, x, y, mask);
}

static GdkWindow *
multihead_default_window_get_pointer (GdkDisplay      *display,
                                      GdkWindow       *window,
                                      gint            *x,
                                      gint            *y,
                                      GdkModifierType *mask)
{
  return gdk_window_real_window_get_device_position (display,
                                                     display->core_pointer,
                                                     window, x, y, mask);
}

static GdkWindow *
multihead_default_window_at_pointer (GdkDisplay *display,
                                     gint       *win_x,
                                     gint       *win_y)
{
  return gdk_display_real_get_window_at_device_position (display,
                                                         display->core_pointer,
                                                         win_x, win_y);
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}

/**
 * gdk_display_set_pointer_hooks:
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 * @display: a #GdkDisplay
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 * @new_hooks: a table of pointers to functions for getting
 *   quantities related to the current pointer position,
 *   or %NULL to restore the default table.
 * 
 * This function allows for hooking into the operation
 * of getting the current location of the pointer on a particular
 * display. This is only useful for such low-level tools as an
 * event recorder. Applications should never have any
 * reason to use this facility.
 *
 * Return value: the previous pointer hook table
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 *
 * Since: 2.2
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 *
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 * Deprecated: 3.0: Use gdk_display_set_device_hooks() instead.
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 **/
GdkDisplayPointerHooks *
gdk_display_set_pointer_hooks (GdkDisplay                   *display,
			       const GdkDisplayPointerHooks *new_hooks)
{
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  const GdkDisplayPointerHooks *result = multihead_current_pointer_hooks;
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  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);

  if (new_hooks)
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    multihead_current_pointer_hooks = new_hooks;
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  else
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    multihead_current_pointer_hooks = &multihead_default_pointer_hooks;

  gdk_display_set_device_hooks (display, &multihead_pointer_hooks);
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  return (GdkDisplayPointerHooks *)result;
}

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static void
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singlehead_get_pointer (GdkDisplay       *display,
			GdkScreen       **screen,
			gint             *x,
			gint             *y,
			GdkModifierType  *mask)
{
  GdkScreen *default_screen = gdk_display_get_default_screen (display);
  GdkWindow *root_window = gdk_screen_get_root_window (default_screen);

  *screen = default_screen;

  singlehead_current_pointer_hooks->get_pointer (root_window, x, y, mask);
}

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static GdkWindow*
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singlehead_window_get_pointer (GdkDisplay       *display,
			       GdkWindow        *window,
			       gint             *x,
			       gint             *y,
			       GdkModifierType  *mask)
{
  return singlehead_current_pointer_hooks->get_pointer (window, x, y, mask);
}

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static GdkWindow*
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singlehead_window_at_pointer   (GdkDisplay *display,
				gint       *win_x,
				gint       *win_y)
{
  GdkScreen *default_screen = gdk_display_get_default_screen (display);

  return singlehead_current_pointer_hooks->window_at_pointer (default_screen,
							      win_x, win_y);
}

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static GdkWindow*
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singlehead_default_window_get_pointer (GdkWindow       *window,
				       gint            *x,
				       gint            *y,
				       GdkModifierType *mask)
{
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  GdkDisplay *display;

  display = gdk_drawable_get_display (window);

  return gdk_window_real_window_get_device_position (display,
                                                     display->core_pointer,
                                                     window, x, y, mask);
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}

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static GdkWindow*
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singlehead_default_window_at_pointer  (GdkScreen       *screen,
				       gint            *win_x,
				       gint            *win_y)
{
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  GdkDisplay *display;

  display = gdk_screen_get_display (screen);

  return gdk_display_real_get_window_at_device_position (display,
                                                         display->core_pointer,
                                                         win_x, win_y);
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}

/**
 * gdk_set_pointer_hooks:
 * @new_hooks: a table of pointers to functions for getting
 *   quantities related to the current pointer position,
 *   or %NULL to restore the default table.
 * 
 * This function allows for hooking into the operation
 * of getting the current location of the pointer. This
 * is only useful for such low-level tools as an
 * event recorder. Applications should never have any
 * reason to use this facility.
 *
 * This function is not multihead safe. For multihead operation,
 * see gdk_display_set_pointer_hooks().
 * 
 * Return value: the previous pointer hook table
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 *
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 * Deprecated: 3.0: Use gdk_display_set_device_hooks() instead.
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 **/
GdkPointerHooks *
gdk_set_pointer_hooks (const GdkPointerHooks *new_hooks)
{
  const GdkPointerHooks *result = singlehead_current_pointer_hooks;

  if (new_hooks)
    singlehead_current_pointer_hooks = new_hooks;
  else
    singlehead_current_pointer_hooks = &singlehead_default_pointer_hooks;

  gdk_display_set_pointer_hooks (gdk_display_get_default (),
				 &singlehead_pointer_hooks);
  
  return (GdkPointerHooks *)result;
}

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static void
generate_grab_broken_event (GdkWindow *window,
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                            GdkDevice *device,
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			    gboolean   implicit,
			    GdkWindow *grab_window)
{
  g_return_if_fail (window != NULL);

  if (!GDK_WINDOW_DESTROYED (window))
    {
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      GdkEvent *event;

      event = gdk_event_new (GDK_GRAB_BROKEN);
      event->grab_broken.window = g_object_ref (window);
      event->grab_broken.send_event = FALSE;
      event->grab_broken.implicit = implicit;
      event->grab_broken.grab_window = grab_window;
      gdk_event_set_device (event, device);
      event->grab_broken.keyboard = (device->source == GDK_SOURCE_KEYBOARD) ? TRUE : FALSE;

      gdk_event_put (event);
      gdk_event_free (event);
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    }
}

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GdkDeviceGrabInfo *
_gdk_display_get_last_device_grab (GdkDisplay *display,
                                   GdkDevice  *device)
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{
  GList *l;

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  l = g_hash_table_lookup (display->device_grabs, device);
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  if (l)
    {
      l = g_list_last (l);
      return l->data;
    }
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  return NULL;
}
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GdkDeviceGrabInfo *
_gdk_display_add_device_grab (GdkDisplay       *display,
                              GdkDevice        *device,
                              GdkWindow        *window,
                              GdkWindow        *native_window,
                              GdkGrabOwnership  grab_ownership,
                              gboolean          owner_events,
                              GdkEventMask      event_mask,
                              unsigned long     serial_start,
                              guint32           time,
                              gboolean          implicit)
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{
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  GdkDeviceGrabInfo *info, *other_info;
  GList *grabs, *l;
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  info = g_new0 (GdkDeviceGrabInfo, 1);
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  info->window = g_object_ref (window);
  info->native_window = g_object_ref (native_window);
  info->serial_start = serial_start;
  info->serial_end = G_MAXULONG;
  info->owner_events = owner_events;
  info->event_mask = event_mask;
  info->time = time;
  info->implicit = implicit;
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  info->ownership = grab_ownership;

  grabs = g_hash_table_lookup (display->device_grabs, device);
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  /* Find the first grab that has a larger start time (if any) and insert
   * before that. I.E we insert after already existing grabs with same
   * start time */
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  for (l = grabs; l != NULL; l = l->next)
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    {
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      other_info = l->data;
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      if (info->serial_start < other_info->serial_start)
	break;
    }
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  grabs = g_list_insert_before (grabs, l, info);
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  /* Make sure the new grab end before next grab */
  if (l)
    {
      other_info = l->data;
      info->serial_end = other_info->serial_start;
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    }
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  /* Find any previous grab and update its end time */
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  l = g_list_find (grabs, info);
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  l = l->prev;
  if (l)
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    {
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      other_info = l->data;
      other_info->serial_end = serial_start;
    }

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  g_hash_table_insert (display->device_grabs, device, grabs);
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  return info;
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}

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/* _gdk_synthesize_crossing_events only works inside one toplevel.