gdkevents-x11.c

linux下电话本所依赖的一些图形库

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * 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, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <config.h>

#include "gdk.h"
#include "gdkprivate-x11.h"
#include "gdkinternals.h"
#include "gdkx.h"
#include "gdkscreen-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkasync.h"

#include "gdkkeysyms.h"

#include "xsettings-client.h"

#include <string.h>

#include "gdkinputprivate.h"

#include "gdkalias.h"

#ifdef HAVE_XKB
#include <X11/XKBlib.h>
#endif

#ifdef HAVE_XSYNC
#include <X11/extensions/sync.h>
#endif

#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif

#include <X11/Xatom.h>

typedef struct _GdkIOClosure GdkIOClosure;
typedef struct _GdkDisplaySource GdkDisplaySource;
typedef struct _GdkEventTypeX11 GdkEventTypeX11;

struct _GdkIOClosure
{
  GdkInputFunction function;
  GdkInputCondition condition;
  GdkDestroyNotify notify;
  gpointer data;
};

struct _GdkDisplaySource
{
  GSource source;
  
  GdkDisplay *display;
  GPollFD event_poll_fd;
};

struct _GdkEventTypeX11
{
  gint base;
  gint n_events;
};

/* 
 * Private function declarations
 */

static gint	 gdk_event_apply_filters (XEvent   *xevent,
					  GdkEvent *event,
					  GList    *filters);
static gboolean	 gdk_event_translate	 (GdkDisplay *display,
					  GdkEvent   *event, 
					  XEvent     *xevent,
					  gboolean    return_exposes);

static gboolean gdk_event_prepare  (GSource     *source,
				    gint        *timeout);
static gboolean gdk_event_check    (GSource     *source);
static gboolean gdk_event_dispatch (GSource     *source,
				    GSourceFunc  callback,
				    gpointer     user_data);

static GdkFilterReturn gdk_wm_protocols_filter (GdkXEvent *xev,
						GdkEvent  *event,
						gpointer   data);

static GSource *gdk_display_source_new (GdkDisplay *display);
static gboolean gdk_check_xpending     (GdkDisplay *display);

static void gdk_xsettings_watch_cb  (Window            window,
				     Bool              is_start,
				     long              mask,
				     void             *cb_data);
static void gdk_xsettings_notify_cb (const char       *name,
				     XSettingsAction   action,
				     XSettingsSetting *setting,
				     void             *data);

/* Private variable declarations
 */

static GList *display_sources;

static GSourceFuncs event_funcs = {
  gdk_event_prepare,
  gdk_event_check,
  gdk_event_dispatch,
  NULL
};

static GSource *
gdk_display_source_new (GdkDisplay *display)
{
  GSource *source = g_source_new (&event_funcs, sizeof (GdkDisplaySource));
  GdkDisplaySource *display_source = (GdkDisplaySource *)source;
  
  display_source->display = display;
  
  return source;
}

static gboolean
gdk_check_xpending (GdkDisplay *display)
{
  return XPending (GDK_DISPLAY_XDISPLAY (display));
}

/*********************************************
 * Functions for maintaining the event queue *
 *********************************************/

static void
refcounted_grab_server (Display *xdisplay)
{
  GdkDisplay *display = gdk_x11_lookup_xdisplay (xdisplay);

  gdk_x11_display_grab (display);
}

static void
refcounted_ungrab_server (Display *xdisplay)
{
  GdkDisplay *display = gdk_x11_lookup_xdisplay (xdisplay);
  
  gdk_x11_display_ungrab (display);
}

void
_gdk_x11_events_init_screen (GdkScreen *screen)
{
  GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (screen);

  /* Keep a flag to avoid extra notifies that we don't need
   */
  screen_x11->xsettings_in_init = TRUE;
  screen_x11->xsettings_client = xsettings_client_new (screen_x11->xdisplay,
						       screen_x11->screen_num,
						       gdk_xsettings_notify_cb,
						       gdk_xsettings_watch_cb,
						       screen);
  xsettings_client_set_grab_func (screen_x11->xsettings_client,
				  refcounted_grab_server);
  xsettings_client_set_ungrab_func (screen_x11->xsettings_client,
				    refcounted_ungrab_server);
  screen_x11->xsettings_in_init = FALSE;
}

void
_gdk_x11_events_uninit_screen (GdkScreen *screen)
{
  GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (screen);

  xsettings_client_destroy (screen_x11->xsettings_client);
  screen_x11->xsettings_client = NULL;
}

void 
_gdk_events_init (GdkDisplay *display)
{
  GSource *source;
  GdkDisplaySource *display_source;
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
  
  int connection_number = ConnectionNumber (display_x11->xdisplay);
  GDK_NOTE (MISC, g_message ("connection number: %d", connection_number));


  source = display_x11->event_source = gdk_display_source_new (display);
  display_source = (GdkDisplaySource*) source;
  g_source_set_priority (source, GDK_PRIORITY_EVENTS);
  
  display_source->event_poll_fd.fd = connection_number;
  display_source->event_poll_fd.events = G_IO_IN;
  
  g_source_add_poll (source, &display_source->event_poll_fd);
  g_source_set_can_recurse (source, TRUE);
  g_source_attach (source, NULL);

  display_sources = g_list_prepend (display_sources,display_source);

  gdk_display_add_client_message_filter (display,
					 gdk_atom_intern ("WM_PROTOCOLS", FALSE), 
					 gdk_wm_protocols_filter,   
					 NULL);
}


/**
 * gdk_events_pending:
 * 
 * Checks if any events are ready to be processed for any display.
 * 
 * Return value:  %TRUE if any events are pending.
 **/
gboolean
gdk_events_pending (void)
{
  GList *tmp_list;

  for (tmp_list = display_sources; tmp_list; tmp_list = tmp_list->next)
    {
      GdkDisplaySource *tmp_source = tmp_list->data;
      GdkDisplay *display = tmp_source->display;
      
      if (_gdk_event_queue_find_first (display))
	return TRUE;
    }

  for (tmp_list = display_sources; tmp_list; tmp_list = tmp_list->next)
    {
      GdkDisplaySource *tmp_source = tmp_list->data;
      GdkDisplay *display = tmp_source->display;
      
      if (gdk_check_xpending (display))
	return TRUE;
    }
  
  return FALSE;
}

static Bool
graphics_expose_predicate (Display  *display,
			   XEvent   *xevent,
			   XPointer  arg)
{
  if (xevent->xany.window == GDK_DRAWABLE_XID ((GdkDrawable *)arg) &&
      (xevent->xany.type == GraphicsExpose ||
       xevent->xany.type == NoExpose))
    return True;
  else
    return False;
}

/**
 * gdk_event_get_graphics_expose:
 * @window: the #GdkWindow to wait for the events for.
 * 
 * Waits for a GraphicsExpose or NoExpose event from the X server.
 * This is used in the #GtkText and #GtkCList widgets in GTK+ to make sure any
 * GraphicsExpose events are handled before the widget is scrolled.
 *
 * Return value:  a #GdkEventExpose if a GraphicsExpose was received, or %NULL if a
 * NoExpose event was received.
 **/
GdkEvent*
gdk_event_get_graphics_expose (GdkWindow *window)
{
  XEvent xevent;
  GdkEvent *event;
  
  g_return_val_if_fail (window != NULL, NULL);
  
  XIfEvent (GDK_WINDOW_XDISPLAY (window), &xevent, 
	    graphics_expose_predicate, (XPointer) window);
  
  if (xevent.xany.type == GraphicsExpose)
    {
      event = gdk_event_new (GDK_NOTHING);
      
      if (gdk_event_translate (GDK_WINDOW_DISPLAY (window), event,
			       &xevent, TRUE))
	return event;
      else
	gdk_event_free (event);
    }
  
  return NULL;	
}

static gint
gdk_event_apply_filters (XEvent *xevent,
			 GdkEvent *event,
			 GList *filters)
{
  GList *tmp_list;
  GdkFilterReturn result;
  
  tmp_list = filters;
  
  while (tmp_list)
    {
      GdkEventFilter *filter = (GdkEventFilter*) tmp_list->data;
      
      tmp_list = tmp_list->next;
      result = filter->function (xevent, event, filter->data);
      if (result !=  GDK_FILTER_CONTINUE)
	return result;
    }
  
  return GDK_FILTER_CONTINUE;
}

/**
 * gdk_display_add_client_message_filter:
 * @display: a #GdkDisplay for which this message filter applies
 * @message_type: the type of ClientMessage events to receive.
 *   This will be checked against the @message_type field 
 *   of the XClientMessage event struct.
 * @func: the function to call to process the event.
 * @data: user data to pass to @func.
 *
 * Adds a filter to be called when X ClientMessage events are received.
 *
 * Since: 2.2
 **/ 
void 
gdk_display_add_client_message_filter (GdkDisplay   *display,
				       GdkAtom       message_type,
				       GdkFilterFunc func,
				       gpointer      data)
{
  GdkClientFilter *filter;
  g_return_if_fail (GDK_IS_DISPLAY (display));
  filter = g_new (GdkClientFilter, 1);

  filter->type = message_type;
  filter->function = func;
  filter->data = data;
  
  GDK_DISPLAY_X11(display)->client_filters = 
    g_list_append (GDK_DISPLAY_X11 (display)->client_filters,
		   filter);
}

/**
 * gdk_add_client_message_filter:
 * @message_type: the type of ClientMessage events to receive. This will be
 *     checked against the <structfield>message_type</structfield> field of the
 *     XClientMessage event struct.
 * @func: the function to call to process the event.
 * @data: user data to pass to @func. 
 * 
 * Adds a filter to the default display to be called when X ClientMessage events
 * are received. See gdk_display_add_client_message_filter().
 **/
void 
gdk_add_client_message_filter (GdkAtom       message_type,
			       GdkFilterFunc func,
			       gpointer      data)
{
  gdk_display_add_client_message_filter (gdk_display_get_default (),
					 message_type, func, data);
}

static void
do_net_wm_state_changes (GdkWindow *window)
{
  GdkToplevelX11 *toplevel = _gdk_x11_window_get_toplevel (window);
  GdkWindowState old_state;
  
  if (GDK_WINDOW_DESTROYED (window) ||
      gdk_window_get_window_type (window) != GDK_WINDOW_TOPLEVEL)
    return;
  
  old_state = gdk_window_get_state (window);

  /* For found_sticky to remain TRUE, we have to also be on desktop
   * 0xFFFFFFFF
   */
  if (old_state & GDK_WINDOW_STATE_STICKY)
    {
      if (!(toplevel->have_sticky && toplevel->on_all_desktops))
        gdk_synthesize_window_state (window,
                                     GDK_WINDOW_STATE_STICKY,
                                     0);
    }
  else
    {
      if (toplevel->have_sticky && toplevel->on_all_desktops)
        gdk_synthesize_window_state (window,
                                     0,
                                     GDK_WINDOW_STATE_STICKY);
    }

  if (old_state & GDK_WINDOW_STATE_FULLSCREEN)
    {
      if (!toplevel->have_fullscreen)
        gdk_synthesize_window_state (window,
                                     GDK_WINDOW_STATE_FULLSCREEN,
                                     0);
    }
  else
    {
      if (toplevel->have_fullscreen)
        gdk_synthesize_window_state (window,
                                     0,
                                     GDK_WINDOW_STATE_FULLSCREEN);
    }
  
  /* Our "maximized" means both vertical and horizontal; if only one,
   * we don't expose that via GDK
   */
  if (old_state & GDK_WINDOW_STATE_MAXIMIZED)
    {
      if (!(toplevel->have_maxvert && toplevel->have_maxhorz))
        gdk_synthesize_window_state (window,
                                     GDK_WINDOW_STATE_MAXIMIZED,
                                     0);
    }
  else
    {
      if (toplevel->have_maxvert && toplevel->have_maxhorz)
        gdk_synthesize_window_state (window,
                                     0,
                                     GDK_WINDOW_STATE_MAXIMIZED);
    }
}

static void
gdk_check_wm_desktop_changed (GdkWindow *window)
{
  GdkToplevelX11 *toplevel = _gdk_x11_window_get_toplevel (window);
  GdkDisplay *display = GDK_WINDOW_DISPLAY (window);

  Atom type;
  gint format;
  gulong nitems;
  gulong bytes_after;

  if (toplevel->have_sticky)
    {
      guchar *data;
      gulong *desktop;
      
      type = None;
      gdk_error_trap_push ();