mutter/clutter/gdk/clutter-event-gdk.c

/* Clutter.
 * An OpenGL based 'interactive canvas' library.
 *
 * Copyright (C) 2006, 2007, 2008  OpenedHand Ltd
 * Copyright (C) 2009, 2010  Intel Corp.
 *               2011 Giovanni Campagna <scampa.giovanni@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 *
 *
 * Authored by:
 *      Matthew Allum <mallum@openedhand.com>
 *      Emmanuele Bassi <ebassi@linux.intel.com>
 */

#include "config.h"

#include "clutter-gdk.h"
#include "clutter-backend-gdk.h"
#include "clutter-device-manager-gdk.h"

#include "clutter-debug.h"
#include "clutter-main.h"
#include "clutter-backend-private.h"
#include "clutter-event-private.h"
#include "clutter-stage-private.h"

#include <string.h>

#include <glib.h>

static void
gdk_event_handler (GdkEvent *event,
		   gpointer  user_data)
{
  clutter_gdk_handle_event (event);
}

void
_clutter_backend_gdk_events_init (ClutterBackend *backend)
{
  gdk_event_handler_set (gdk_event_handler, NULL, NULL);

  CLUTTER_NOTE (EVENT, "GDK event handler set");
}

void
_clutter_backend_gdk_events_uninit (ClutterBackend *backend)
{
  gdk_event_handler_set (NULL, NULL, NULL);
}

/**
 * clutter_gdk_handle_event:
 * @event: a #GdkEvent
 *
 * This function processes a single GDK event; it can be used to hook
 * into external event processing
 *
 * Return value: #GdkFilterReturn. %GDK_FILTER_REMOVE indicates that
 *  Clutter has internally handled the event and the caller should do
 *  no further processing. %GDK_FILTER_CONTINUE indicates that Clutter
 *  is either not interested in the event, or has used the event to
 *  update internal state without taking any exclusive action.
 *  %GDK_FILTER_TRANSLATE will not occur.
 *
 */
GdkFilterReturn
clutter_gdk_handle_event (GdkEvent *gdk_event)
{
  ClutterDeviceManager *device_manager;
  ClutterBackendGdk *backend_gdk;
  ClutterStage *stage = NULL;
  ClutterEvent *event = NULL;
  gint spin = 0;
  GdkFilterReturn result = GDK_FILTER_CONTINUE;

  if (gdk_event->any.window == NULL)
    return GDK_FILTER_CONTINUE;

  clutter_threads_enter ();

  backend_gdk = CLUTTER_BACKEND_GDK (clutter_get_default_backend ());
  stage = clutter_gdk_get_stage_from_window (gdk_event->any.window);
  device_manager = clutter_device_manager_get_default ();

  if (stage == NULL)
    goto out;

  switch (gdk_event->type) {
  case GDK_DELETE:
    event = clutter_event_new (CLUTTER_DELETE);
    break;

  case GDK_DESTROY:
    event = clutter_event_new (CLUTTER_DESTROY_NOTIFY);
    break;

  case GDK_EXPOSE:
    clutter_redraw (stage);
    break;

  case GDK_DAMAGE:
    /* This is handled by cogl */
    goto out;

  case GDK_MOTION_NOTIFY:
    event = clutter_event_new (CLUTTER_MOTION);
    event->motion.time = gdk_event->motion.time;
    event->motion.x = gdk_event->motion.x;
    event->motion.y = gdk_event->motion.y;
    event->motion.axes = NULL;
    /* It's all X in the end, right? */
    event->motion.modifier_state = gdk_event->motion.state;
    event->motion.device = _clutter_device_manager_gdk_lookup_device (device_manager,
								      gdk_event->motion.device);
    break;

  case GDK_BUTTON_PRESS:
  case GDK_BUTTON_RELEASE:
    event = clutter_event_new (gdk_event->type == GDK_BUTTON_PRESS ?
			       CLUTTER_BUTTON_PRESS :
			       CLUTTER_BUTTON_RELEASE);
    event->button.time = gdk_event->button.time;
    event->button.x = gdk_event->button.x;
    event->button.y = gdk_event->button.y;
    event->button.axes = NULL;
    event->button.modifier_state = gdk_event->button.state;
    event->button.button = gdk_event->button.button;
    event->button.click_count = 1;
    event->button.device = _clutter_device_manager_gdk_lookup_device (device_manager,
								      gdk_event->button.device);
    break;

  case GDK_2BUTTON_PRESS:
  case GDK_3BUTTON_PRESS:
    /* these are handled by clutter-main.c updating click_count */
    goto out;

  case GDK_KEY_PRESS:
  case GDK_KEY_RELEASE:
    event = clutter_event_new (gdk_event->type == GDK_KEY_PRESS ?
			       CLUTTER_KEY_PRESS :
			       CLUTTER_KEY_RELEASE);
    event->key.time = gdk_event->key.time;
    event->key.modifier_state = gdk_event->key.state;
    event->key.keyval = gdk_event->key.keyval;
    event->key.hardware_keycode = gdk_event->key.hardware_keycode;
    event->key.unicode_value = g_utf8_get_char (gdk_event->key.string);
    break;

  case GDK_ENTER_NOTIFY:
  case GDK_LEAVE_NOTIFY:
    event = clutter_event_new (gdk_event->type == GDK_ENTER_NOTIFY ?
			       CLUTTER_ENTER :
			       CLUTTER_LEAVE);
    event->crossing.source = CLUTTER_ACTOR (stage);
    event->crossing.time = gdk_event->crossing.time;
    event->crossing.x = gdk_event->crossing.x;
    event->crossing.y = gdk_event->crossing.y;

    /* XXX: no better fallback here? */
    event->crossing.device = clutter_device_manager_get_core_device (device_manager,
								     CLUTTER_POINTER_DEVICE);

    if (gdk_event->type == GDK_ENTER_NOTIFY)
      _clutter_stage_add_device (stage, event->crossing.device);
    else
      _clutter_stage_remove_device (stage, event->crossing.device);
    break;

  case GDK_FOCUS_CHANGE:
    event = clutter_event_new (CLUTTER_STAGE_STATE);
    event->stage_state.time = 0; /* XXX: there is no timestamp in this GdkEvent */
    event->stage_state.changed_mask = CLUTTER_STAGE_STATE_ACTIVATED;
    event->stage_state.new_state = gdk_event->focus_change.in ? CLUTTER_STAGE_STATE_ACTIVATED : 0;
    break;

  case GDK_CONFIGURE:
    clutter_actor_set_size (CLUTTER_ACTOR (stage),
			    gdk_event->configure.width,
			    gdk_event->configure.height);
    break;

  case GDK_SCROLL:
    event = clutter_event_new (CLUTTER_SCROLL);
    event->scroll.time = gdk_event->scroll.time;
    event->scroll.x = gdk_event->scroll.x;
    event->scroll.y = gdk_event->scroll.y;
    event->scroll.modifier_state = gdk_event->scroll.state;
    event->scroll.axes = NULL;
    event->scroll.direction = gdk_event->scroll.direction;
    event->scroll.device = _clutter_device_manager_gdk_lookup_device (device_manager,
								      gdk_event->scroll.device);

  case GDK_WINDOW_STATE:
    event = clutter_event_new (CLUTTER_STAGE_STATE);
    event->stage_state.changed_mask = 0;
    event->stage_state.new_state = 0;
    if (gdk_event->window_state.changed_mask & GDK_WINDOW_STATE_WITHDRAWN)
      {
	event->stage_state.changed_mask |= CLUTTER_STAGE_STATE_OFFSCREEN;
	event->stage_state.new_state |= (gdk_event->window_state.new_window_state & GDK_WINDOW_STATE_WITHDRAWN) ?
	  CLUTTER_STAGE_STATE_OFFSCREEN : 0;
      }
    if (gdk_event->window_state.changed_mask & GDK_WINDOW_STATE_FULLSCREEN)
      {
	event->stage_state.changed_mask |= CLUTTER_STAGE_STATE_FULLSCREEN;
	event->stage_state.new_state |= (gdk_event->window_state.new_window_state & GDK_WINDOW_STATE_FULLSCREEN) ?
	  CLUTTER_STAGE_STATE_FULLSCREEN : 0;
      }
    break;

  case GDK_SETTING:
    _clutter_backend_gdk_update_setting (backend_gdk, gdk_event->setting.name);
    break;

  default:
    break;
  }

  if (event != NULL)
    {
      event->any.stage = stage;
      if (gdk_event->any.send_event)
	event->any.flags = CLUTTER_EVENT_FLAG_SYNTHETIC;

      _clutter_event_push (event, FALSE);
      spin = 1;

      CLUTTER_NOTE (EVENT, "Translated one event from Gdk");

      /* handle also synthetic enter/leave events */
      if (event->type == CLUTTER_MOTION)
	spin += 2;

      while (spin > 0 && (event = clutter_event_get ()))
	{
	  /* forward the event into clutter for emission etc. */
	  clutter_do_event (event);
	  clutter_event_free (event);
	  --spin;
	}

      result = GDK_FILTER_REMOVE;
    }

 out:

  clutter_threads_leave ();
  return result;
}