gdkdevicemanager-xi2.c

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 2009 Carlos Garnacho <carlosg@gnome.org>
 *
 * 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/>.
 */

#include "config.h"

#include "gdkx11devicemanager-xi2.h"
#include "gdkx11device-xi2.h"

#include "gdkdevicemanagerprivate-core.h"
#include "gdkdeviceprivate.h"
#include "gdkdevicetoolprivate.h"
#include "gdkdisplayprivate.h"
#include "gdkeventtranslator.h"
#include "gdkprivate-x11.h"
#include "gdkintl.h"
#include "gdkkeysyms.h"
#include "gdkinternals.h"
#include "gdkseatdefaultprivate.h"

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/XInput2.h>
#include <X11/Xatom.h>

#include <string.h>

static const char *wacom_type_atoms[] = {
  "STYLUS",
  "CURSOR",
  "ERASER",
  "PAD",
  "TOUCH"
};
#define N_WACOM_TYPE_ATOMS G_N_ELEMENTS (wacom_type_atoms)

enum {
  WACOM_TYPE_STYLUS,
  WACOM_TYPE_CURSOR,
  WACOM_TYPE_ERASER,
  WACOM_TYPE_PAD,
  WACOM_TYPE_TOUCH,
};

struct _GdkX11DeviceManagerXI2
{
  GdkX11DeviceManagerCore parent_object;

  GHashTable *id_table;

  GList *devices;

  gint opcode;
  gint major;
  gint minor;
};

struct _GdkX11DeviceManagerXI2Class
{
  GdkDeviceManagerClass parent_class;
};

static void     gdk_x11_device_manager_xi2_event_translator_init (GdkEventTranslatorIface *iface);

G_DEFINE_TYPE_WITH_CODE (GdkX11DeviceManagerXI2, gdk_x11_device_manager_xi2, GDK_TYPE_X11_DEVICE_MANAGER_CORE,
                         G_IMPLEMENT_INTERFACE (GDK_TYPE_EVENT_TRANSLATOR,
                                                gdk_x11_device_manager_xi2_event_translator_init))

static void    gdk_x11_device_manager_xi2_constructed  (GObject      *object);
static void    gdk_x11_device_manager_xi2_dispose      (GObject      *object);
static void    gdk_x11_device_manager_xi2_set_property (GObject      *object,
                                                        guint         prop_id,
                                                        const GValue *value,
                                                        GParamSpec   *pspec);
static void    gdk_x11_device_manager_xi2_get_property (GObject      *object,
                                                        guint         prop_id,
                                                        GValue       *value,
                                                        GParamSpec   *pspec);

static GList * gdk_x11_device_manager_xi2_list_devices (GdkDeviceManager *device_manager,
                                                        GdkDeviceType     type);
static GdkDevice * gdk_x11_device_manager_xi2_get_client_pointer (GdkDeviceManager *device_manager);

static gboolean gdk_x11_device_manager_xi2_translate_event (GdkEventTranslator *translator,
                                                            GdkDisplay         *display,
                                                            GdkEvent           *event,
                                                            XEvent             *xevent);
static GdkEventMask gdk_x11_device_manager_xi2_get_handled_events   (GdkEventTranslator *translator);
static void         gdk_x11_device_manager_xi2_select_window_events (GdkEventTranslator *translator,
                                                                     Window              window,
                                                                     GdkEventMask        event_mask);
static GdkWindow *  gdk_x11_device_manager_xi2_get_window           (GdkEventTranslator *translator,
                                                                     XEvent             *xevent);

enum {
  PROP_0,
  PROP_OPCODE,
  PROP_MAJOR,
  PROP_MINOR
};

static void
gdk_x11_device_manager_xi2_class_init (GdkX11DeviceManagerXI2Class *klass)
{
  GdkDeviceManagerClass *device_manager_class = GDK_DEVICE_MANAGER_CLASS (klass);
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->constructed = gdk_x11_device_manager_xi2_constructed;
  object_class->dispose = gdk_x11_device_manager_xi2_dispose;
  object_class->set_property = gdk_x11_device_manager_xi2_set_property;
  object_class->get_property = gdk_x11_device_manager_xi2_get_property;

  device_manager_class->list_devices = gdk_x11_device_manager_xi2_list_devices;
  device_manager_class->get_client_pointer = gdk_x11_device_manager_xi2_get_client_pointer;

  g_object_class_install_property (object_class,
                                   PROP_OPCODE,
                                   g_param_spec_int ("opcode",
                                                     P_("Opcode"),
                                                     P_("Opcode for XInput2 requests"),
                                                     0, G_MAXINT, 0,
                                                     G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
  g_object_class_install_property (object_class,
                                   PROP_MAJOR,
                                   g_param_spec_int ("major",
                                                     P_("Major"),
                                                     P_("Major version number"),
                                                     0, G_MAXINT, 0,
                                                     G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
  g_object_class_install_property (object_class,
                                   PROP_MINOR,
                                   g_param_spec_int ("minor",
                                                     P_("Minor"),
                                                     P_("Minor version number"),
                                                     0, G_MAXINT, 0,
                                                     G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
}

static void
gdk_x11_device_manager_xi2_init (GdkX11DeviceManagerXI2 *device_manager)
{
  device_manager->id_table = g_hash_table_new_full (g_direct_hash,
                                                    g_direct_equal,
                                                    NULL,
                                                    (GDestroyNotify) g_object_unref);
}

static void
_gdk_x11_device_manager_xi2_select_events (GdkDeviceManager *device_manager,
                                           Window            xwindow,
                                           XIEventMask      *event_mask)
{
  GdkDisplay *display;
  Display *xdisplay;

  display = gdk_device_manager_get_display (device_manager);
  xdisplay = GDK_DISPLAY_XDISPLAY (display);

  XISelectEvents (xdisplay, xwindow, event_mask, 1);
}

static void
translate_valuator_class (GdkDisplay          *display,
                          GdkDevice           *device,
                          Atom                 valuator_label,
                          gdouble              min,
                          gdouble              max,
                          gdouble              resolution)
{
  static gboolean initialized = FALSE;
  static Atom label_atoms [GDK_AXIS_LAST] = { 0 };
  GdkAxisUse use = GDK_AXIS_IGNORE;
  GdkAtom label;
  gint i;

  if (!initialized)
    {
      label_atoms [GDK_AXIS_X] = gdk_x11_get_xatom_by_name_for_display (display, "Abs X");
      label_atoms [GDK_AXIS_Y] = gdk_x11_get_xatom_by_name_for_display (display, "Abs Y");
      label_atoms [GDK_AXIS_PRESSURE] = gdk_x11_get_xatom_by_name_for_display (display, "Abs Pressure");
      label_atoms [GDK_AXIS_XTILT] = gdk_x11_get_xatom_by_name_for_display (display, "Abs Tilt X");
      label_atoms [GDK_AXIS_YTILT] = gdk_x11_get_xatom_by_name_for_display (display, "Abs Tilt Y");
      label_atoms [GDK_AXIS_WHEEL] = gdk_x11_get_xatom_by_name_for_display (display, "Abs Wheel");
      initialized = TRUE;
    }

  for (i = GDK_AXIS_IGNORE; i < GDK_AXIS_LAST; i++)
    {
      if (label_atoms[i] == valuator_label)
        {
          use = i;
          break;
        }
    }

  if (valuator_label != None)
    label = gdk_x11_xatom_to_atom_for_display (display, valuator_label);
  else
    label = GDK_NONE;

  _gdk_device_add_axis (device, label, use, min, max, resolution);
  GDK_NOTE (INPUT, g_message ("\n\taxis: %s %s", gdk_atom_name (label), use == GDK_AXIS_IGNORE ? "(ignored)" : "(used)"));
}

static void
translate_device_classes (GdkDisplay      *display,
                          GdkDevice       *device,
                          XIAnyClassInfo **classes,
                          guint            n_classes)
{
  gint i;

  g_object_freeze_notify (G_OBJECT (device));

  for (i = 0; i < n_classes; i++)
    {
      XIAnyClassInfo *class_info = classes[i];

      switch (class_info->type)
        {
        case XIKeyClass:
          {
            XIKeyClassInfo *key_info = (XIKeyClassInfo *) class_info;
            gint j;

            _gdk_device_set_keys (device, key_info->num_keycodes);

            for (j = 0; j < key_info->num_keycodes; j++)
              gdk_device_set_key (device, j, key_info->keycodes[j], 0);
          }
          break;
        case XIValuatorClass:
          {
            XIValuatorClassInfo *valuator_info = (XIValuatorClassInfo *) class_info;
            translate_valuator_class (display, device,
                                      valuator_info->label,
                                      valuator_info->min,
                                      valuator_info->max,
                                      valuator_info->resolution);
          }
          break;
#ifdef XINPUT_2_2
        case XIScrollClass:
          {
            XIScrollClassInfo *scroll_info = (XIScrollClassInfo *) class_info;
            GdkScrollDirection direction;

            if (scroll_info->scroll_type == XIScrollTypeVertical)
              direction = GDK_SCROLL_DOWN;
            else
              direction = GDK_SCROLL_RIGHT;

            GDK_NOTE (INPUT,
                      g_message ("\n\tscroll valuator %d: %s, increment %f",
                                 scroll_info->number,
                                 scroll_info->scroll_type == XIScrollTypeVertical
                                                ? "vertical"
                                                : "horizontal",
                                 scroll_info->increment));

            _gdk_x11_device_xi2_add_scroll_valuator (GDK_X11_DEVICE_XI2 (device),
                                                     scroll_info->number,
                                                     direction,
                                                     scroll_info->increment);
          }
#endif /* XINPUT_2_2 */
        default:
          /* Ignore */
          break;
        }
    }

  g_object_thaw_notify (G_OBJECT (device));
}

static gboolean
is_touch_device (XIAnyClassInfo **classes,
                 guint            n_classes,
                 GdkInputSource  *device_type,
                 gint            *num_touches)
{
#ifdef XINPUT_2_2
  guint i;

  for (i = 0; i < n_classes; i++)
    {
      XITouchClassInfo *class = (XITouchClassInfo *) classes[i];

      if (class->type != XITouchClass)
        continue;

      if (class->num_touches > 0)
        {
          if (class->mode == XIDirectTouch)
            *device_type = GDK_SOURCE_TOUCHSCREEN;
          else if (class->mode == XIDependentTouch)
            *device_type = GDK_SOURCE_TOUCHPAD;
          else
            continue;

          *num_touches = class->num_touches;

          return TRUE;
        }
    }
#endif

  return FALSE;
}

static gboolean
has_abs_axes (GdkDisplay      *display,
              XIAnyClassInfo **classes,
              guint            n_classes)
{
  gboolean has_x = FALSE, has_y = FALSE;
  Atom abs_x, abs_y;
  guint i;

  abs_x = gdk_x11_get_xatom_by_name_for_display (display, "Abs X");
  abs_y = gdk_x11_get_xatom_by_name_for_display (display, "Abs Y");

  for (i = 0; i < n_classes; i++)
    {
      XIValuatorClassInfo *class = (XIValuatorClassInfo *) classes[i];

      if (class->type != XIValuatorClass)
        continue;
      if (class->mode != XIModeAbsolute)
        continue;

      if (class->label == abs_x)
        has_x = TRUE;
      else if (class->label == abs_y)
        has_y = TRUE;

      if (has_x && has_y)
        break;
    }

  return (has_x && has_y);
}

static gboolean
get_device_ids (GdkDisplay    *display,
                XIDeviceInfo  *info,
                gchar        **vendor_id,
                gchar        **product_id)
{
  gulong nitems, bytes_after;
  guint32 *data;
  int rc, format;
  Atom prop, type;

  gdk_x11_display_error_trap_push (display);

  prop = XInternAtom (GDK_DISPLAY_XDISPLAY (display), "Device Product ID", True);

  if (prop == None)
    {
      gdk_x11_display_error_trap_pop_ignored (display);
      return 0;
    }

  rc = XIGetProperty (GDK_DISPLAY_XDISPLAY (display),
                      info->deviceid, prop,
                      0, 2, False, XA_INTEGER, &type, &format, &nitems, &bytes_after,
                      (guchar **) &data);
  gdk_x11_display_error_trap_pop_ignored (display);

  if (rc != Success || type != XA_INTEGER || format != 32 || nitems != 2)
    return FALSE;

  if (vendor_id)
    *vendor_id = g_strdup_printf ("%.4x", data[0]);
  if (product_id)
    *product_id = g_strdup_printf ("%.4x", data[1]);

  XFree (data);

  return TRUE;
}

static gboolean
is_touchpad_device (GdkDisplay   *display,
                    XIDeviceInfo *info)
{
  gulong nitems, bytes_after;
  guint32 *data;
  int rc, format;
  Atom type;

  gdk_x11_display_error_trap_push (display);

  rc = XIGetProperty (GDK_DISPLAY_XDISPLAY (display),
                      info->deviceid,
                      gdk_x11_get_xatom_by_name_for_display (display, "libinput Tapping Enabled"),
                      0, 1, False, XA_INTEGER, &type, &format, &nitems, &bytes_after,
                      (guchar **) &data);
  gdk_x11_display_error_trap_pop_ignored (display);

  if (rc != Success || type != XA_INTEGER || format != 8 || nitems != 1)
    return FALSE;

  XFree (data);

  return TRUE;
}

static GdkDevice *
create_device (GdkDeviceManager *device_manager,
               GdkDisplay       *display,
               XIDeviceInfo     *dev)
{
  GdkInputSource input_source;
  GdkInputSource touch_source;
  GdkDeviceType type;
  GdkDevice *device;
  GdkInputMode mode;
  gint num_touches = 0;
  gchar *vendor_id = NULL, *product_id = NULL;

  if (dev->use == XIMasterKeyboard || dev->use == XISlaveKeyboard)
    input_source = GDK_SOURCE_KEYBOARD;
  else if (is_touchpad_device (display, dev))
    input_source = GDK_SOURCE_TOUCHPAD;
  else if (dev->use == XISlavePointer &&
           is_touch_device (dev->classes, dev->num_classes, &touch_source, &num_touches))
    input_source = touch_source;
  else
    {
      gchar *tmp_name;

      tmp_name = g_ascii_strdown (dev->name, -1);

      if (strstr (tmp_name, "eraser"))
        input_source = GDK_SOURCE_ERASER;
      else if (strstr (tmp_name, "cursor"))
        input_source = GDK_SOURCE_CURSOR;
      else if (strstr (tmp_name, " pad"))
        input_source = GDK_SOURCE_TABLET_PAD;
      else if (strstr (tmp_name, "wacom") ||
               strstr (tmp_name, "pen") ||
               strstr (tmp_name, "stylus"))
        input_source = GDK_SOURCE_PEN;
      else if (!strstr (tmp_name, "mouse") &&
               !strstr (tmp_name, "pointer") &&
               !strstr (tmp_name, "qemu usb tablet") &&
               !strstr (tmp_name, "spice vdagent tablet") &&
               !strstr (tmp_name, "virtualbox usb tablet") &&
               has_abs_axes (display, dev->classes, dev->num_classes))
        input_source = GDK_SOURCE_TOUCHSCREEN;
      else if (strstr (tmp_name, "trackpoint") ||
               strstr (tmp_name, "dualpoint stick"))
        input_source = GDK_SOURCE_TRACKPOINT;
      else
        input_source = GDK_SOURCE_MOUSE;

      g_free (tmp_name);
    }

  switch (dev->use)
    {
    case XIMasterKeyboard:
    case XIMasterPointer:
      type = GDK_DEVICE_TYPE_MASTER;
      mode = GDK_MODE_SCREEN;
      break;
    case XISlaveKeyboard:
    case XISlavePointer:
      type = GDK_DEVICE_TYPE_SLAVE;
      mode = GDK_MODE_DISABLED;
      break;
    case XIFloatingSlave:
    default:
      type = GDK_DEVICE_TYPE_FLOATING;
      mode = GDK_MODE_DISABLED;
      break;
    }

  GDK_NOTE (INPUT,
            ({
              const gchar *type_names[] = { "master", "slave", "floating" };
              const gchar *source_names[] = { "mouse", "pen", "eraser", "cursor", "keyboard", "direct touch", "indirect touch", "trackpoint", "pad" };
              const gchar *mode_names[] = { "disabled", "screen", "window" };
              g_message ("input device:\n\tname: %s\n\ttype: %s\n\tsource: %s\n\tmode: %s\n\thas cursor: %d\n\ttouches: %d",
                         dev->name,
                         type_names[type],
                         source_names[input_source],
                         mode_names[mode],
                         dev->use == XIMasterPointer,
                         num_touches);
            }));

  if (dev->use != XIMasterKeyboard &&
      dev->use != XIMasterPointer)
    get_device_ids (display, dev, &vendor_id, &product_id);

  device = g_object_new (GDK_TYPE_X11_DEVICE_XI2,
                         "name", dev->name,
                         "type", type,
                         "input-source", input_source,
                         "input-mode", mode,
                         "has-cursor", (dev->use == XIMasterPointer),
                         "display", display,
                         "device-manager", device_manager,
                         "device-id", dev->deviceid,
                         "vendor-id", vendor_id,
                         "product-id", product_id,
                         "num-touches", num_touches,
                         NULL);

  translate_device_classes (display, device, dev->classes, dev->num_classes);
  g_free (vendor_id);
  g_free (product_id);

  return device;
}

static void
ensure_seat_for_device_pair (GdkX11DeviceManagerXI2 *device_manager,
                             GdkDevice              *device1,
                             GdkDevice              *device2)
{
  GdkDevice *pointer, *keyboard;
  GdkDisplay *display;
  GdkSeat *seat;

  display = gdk_device_manager_get_display (GDK_DEVICE_MANAGER (device_manager));
  seat = gdk_device_get_seat (device1);

  if (!seat)
    {
      if (gdk_device_get_source (device1) == GDK_SOURCE_KEYBOARD)
        {
          keyboard = device1;
          pointer = device2;
        }
      else
        {
          pointer = device1;
          keyboard = device2;
        }

      seat = gdk_seat_default_new_for_master_pair (pointer, keyboard);
      gdk_display_add_seat (display, seat);
      g_object_unref (seat);
    }
}

static GdkDevice *
add_device (GdkX11DeviceManagerXI2 *device_manager,
            XIDeviceInfo           *dev,
            gboolean                emit_signal)
{
  GdkDisplay *display;
  GdkDevice *device;

  display = gdk_device_manager_get_display (GDK_DEVICE_MANAGER (device_manager));
  device = create_device (GDK_DEVICE_MANAGER (device_manager), display, dev);

  g_hash_table_replace (device_manager->id_table,
                        GINT_TO_POINTER (dev->deviceid),
                        g_object_ref (device));

  device_manager->devices = g_list_append (device_manager->devices, device);

  if (emit_signal)
    {
      if (dev->use == XISlavePointer || dev->use == XISlaveKeyboard)
        {
          GdkDevice *master;
          GdkSeat *seat;

          /* The device manager is already constructed, then
           * keep the hierarchy coherent for the added device.
           */
          master = g_hash_table_lookup (device_manager->id_table,
                                        GINT_TO_POINTER (dev->attachment));

          _gdk_device_set_associated_device (device, master);
          _gdk_device_add_slave (master, device);

          seat = gdk_device_get_seat (master);
          gdk_seat_default_add_slave (GDK_SEAT_DEFAULT (seat), device);
        }
      else if (dev->use == XIMasterPointer || dev->use == XIMasterKeyboard)
        {
          GdkDevice *relative;

          relative = g_hash_table_lookup (device_manager->id_table,
                                          GINT_TO_POINTER (dev->attachment));

          if (relative)
            {
              _gdk_device_set_associated_device (device, relative);
              _gdk_device_set_associated_device (relative, device);
              ensure_seat_for_device_pair (device_manager, device, relative);
            }
        }
    }

    g_signal_emit_by_name (device_manager, "device-added", device);

  return device;
}

static void
detach_from_seat (GdkDevice *device)
{
  GdkSeat *seat = gdk_device_get_seat (device);

  if (!seat)
    return;

  if (gdk_device_get_device_type (device) == GDK_DEVICE_TYPE_MASTER)
    gdk_display_remove_seat (gdk_device_get_display (device), seat);
  else if (gdk_device_get_device_type (device) == GDK_DEVICE_TYPE_SLAVE)
    gdk_seat_default_remove_slave (GDK_SEAT_DEFAULT (seat), device);
}

static void
remove_device (GdkX11DeviceManagerXI2 *device_manager,
               gint                    device_id)
{
  GdkDevice *device;

  device = g_hash_table_lookup (device_manager->id_table,
                                GINT_TO_POINTER (device_id));

  if (device)
    {
      detach_from_seat (device);

      g_hash_table_remove (device_manager->id_table,
                           GINT_TO_POINTER (device_id));

      device_manager->devices = g_list_remove (device_manager->devices, device);
      g_signal_emit_by_name (device_manager, "device-removed", device);
      g_object_run_dispose (G_OBJECT (device));
      g_object_unref (device);
    }
}

static void
relate_masters (gpointer key,
                gpointer value,
                gpointer user_data)
{
  GdkX11DeviceManagerXI2 *device_manager;
  GdkDevice *device, *relative;

  device_manager = user_data;
  device = g_hash_table_lookup (device_manager->id_table, key);
  relative = g_hash_table_lookup (device_manager->id_table, value);

  _gdk_device_set_associated_device (device, relative);
  _gdk_device_set_associated_device (relative, device);
  ensure_seat_for_device_pair (device_manager, device, relative);
}

static void
relate_slaves (gpointer key,
               gpointer value,
               gpointer user_data)
{
  GdkX11DeviceManagerXI2 *device_manager;
  GdkDevice *slave, *master;
  GdkSeat *seat;

  device_manager = user_data;
  slave = g_hash_table_lookup (device_manager->id_table, key);
  master = g_hash_table_lookup (device_manager->id_table, value);

  _gdk_device_set_associated_device (slave, master);
  _gdk_device_add_slave (master, slave);

  seat = gdk_device_get_seat (master);
  gdk_seat_default_add_slave (GDK_SEAT_DEFAULT (seat), slave);
}

static void
gdk_x11_device_manager_xi2_constructed (GObject *object)
{
  GdkX11DeviceManagerXI2 *device_manager;
  GdkDisplay *display;
  GdkScreen *screen;
  GHashTable *masters, *slaves;
  Display *xdisplay;
  XIDeviceInfo *info, *dev;
  int ndevices, i;
  XIEventMask event_mask;
  unsigned char mask[2] = { 0 };

  G_OBJECT_CLASS (gdk_x11_device_manager_xi2_parent_class)->constructed (object);

  device_manager = GDK_X11_DEVICE_MANAGER_XI2 (object);
  display = gdk_device_manager_get_display (GDK_DEVICE_MANAGER (object));
  xdisplay = GDK_DISPLAY_XDISPLAY (display);

  g_assert (device_manager->major == 2);

  masters = g_hash_table_new (NULL, NULL);
  slaves = g_hash_table_new (NULL, NULL);

  info = XIQueryDevice (xdisplay, XIAllDevices, &ndevices);

  /* Initialize devices list */
  for (i = 0; i < ndevices; i++)
    {
      dev = &info[i];

      if (!dev->enabled)
	      continue;

      add_device (device_manager, dev, FALSE);

      if (dev->use == XIMasterPointer ||
          dev->use == XIMasterKeyboard)
        {
          g_hash_table_insert (masters,
                               GINT_TO_POINTER (dev->deviceid),
                               GINT_TO_POINTER (dev->attachment));
        }
      else if (dev->use == XISlavePointer ||
               dev->use == XISlaveKeyboard)
        {
          g_hash_table_insert (slaves,
                               GINT_TO_POINTER (dev->deviceid),
                               GINT_TO_POINTER (dev->attachment));
        }
    }

  XIFreeDeviceInfo (info);

  /* Stablish relationships between devices */
  g_hash_table_foreach (masters, relate_masters, object);
  g_hash_table_destroy (masters);

  g_hash_table_foreach (slaves, relate_slaves, object);
  g_hash_table_destroy (slaves);

  /* Connect to hierarchy change events */
  screen = gdk_display_get_default_screen (display);
  XISetMask (mask, XI_HierarchyChanged);
  XISetMask (mask, XI_DeviceChanged);
  XISetMask (mask, XI_PropertyEvent);

  event_mask.deviceid = XIAllDevices;
  event_mask.mask_len = sizeof (mask);
  event_mask.mask = mask;

  _gdk_x11_device_manager_xi2_select_events (GDK_DEVICE_MANAGER (object),
                                             GDK_WINDOW_XID (gdk_screen_get_root_window (screen)),
                                             &event_mask);
}

static void
gdk_x11_device_manager_xi2_dispose (GObject *object)
{
  GdkX11DeviceManagerXI2 *device_manager;

  device_manager = GDK_X11_DEVICE_MANAGER_XI2 (object);

  g_list_free_full (device_manager->devices, g_object_unref);
  device_manager->devices = NULL;

  if (device_manager->id_table)
    {
      g_hash_table_destroy (device_manager->id_table);
      device_manager->id_table = NULL;
    }

  G_OBJECT_CLASS (gdk_x11_device_manager_xi2_parent_class)->dispose (object);
}

static GList *
gdk_x11_device_manager_xi2_list_devices (GdkDeviceManager *device_manager,
                                         GdkDeviceType     type)
{
  GdkX11DeviceManagerXI2 *device_manager_xi2;
  GList *cur, *list = NULL;

  device_manager_xi2 = GDK_X11_DEVICE_MANAGER_XI2 (device_manager);

  for (cur = device_manager_xi2->devices; cur; cur = cur->next)
    {
      GdkDevice *dev = cur->data;

      if (type == gdk_device_get_device_type (dev))
        list = g_list_prepend (list, dev);
    }

  return list;
}

static GdkDevice *
gdk_x11_device_manager_xi2_get_client_pointer (GdkDeviceManager *device_manager)
{
  GdkX11DeviceManagerXI2 *device_manager_xi2;
  GdkDisplay *display;
  int device_id;

  device_manager_xi2 = (GdkX11DeviceManagerXI2 *) device_manager;
  display = gdk_device_manager_get_display (device_manager);

  XIGetClientPointer (GDK_DISPLAY_XDISPLAY (display),
                      None, &device_id);

  return g_hash_table_lookup (device_manager_xi2->id_table,
                              GINT_TO_POINTER (device_id));
}

static void
gdk_x11_device_manager_xi2_set_property (GObject      *object,
                                         guint         prop_id,
                                         const GValue *value,
                                         GParamSpec   *pspec)
{
  GdkX11DeviceManagerXI2 *device_manager;

  device_manager = GDK_X11_DEVICE_MANAGER_XI2 (object);

  switch (prop_id)
    {
    case PROP_OPCODE:
      device_manager->opcode = g_value_get_int (value);
      break;
    case PROP_MAJOR:
      device_manager->major = g_value_get_int (value);
      break;
    case PROP_MINOR:
      device_manager->minor = g_value_get_int (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gdk_x11_device_manager_xi2_get_property (GObject    *object,
                                         guint       prop_id,
                                         GValue     *value,
                                         GParamSpec *pspec)
{
  GdkX11DeviceManagerXI2 *device_manager;

  device_manager = GDK_X11_DEVICE_MANAGER_XI2 (object);

  switch (prop_id)
    {
    case PROP_OPCODE:
      g_value_set_int (value, device_manager->opcode);
      break;
    case PROP_MAJOR:
      g_value_set_int (value, device_manager->major);
      break;
    case PROP_MINOR:
      g_value_set_int (value, device_manager->minor);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gdk_x11_device_manager_xi2_event_translator_init (GdkEventTranslatorIface *iface)
{
  iface->translate_event = gdk_x11_device_manager_xi2_translate_event;
  iface->get_handled_events = gdk_x11_device_manager_xi2_get_handled_events;
  iface->select_window_events = gdk_x11_device_manager_xi2_select_window_events;
  iface->get_window = gdk_x11_device_manager_xi2_get_window;
}

static void
handle_hierarchy_changed (GdkX11DeviceManagerXI2 *device_manager,
                          XIHierarchyEvent       *ev)
{
  GdkDisplay *display;
  Display *xdisplay;
  XIDeviceInfo *info;
  int ndevices;
  gint i;

  display = gdk_device_manager_get_display (GDK_DEVICE_MANAGER (device_manager));
  xdisplay = GDK_DISPLAY_XDISPLAY (display);

  for (i = 0; i < ev->num_info; i++)
    {
      if (ev->info[i].flags & XIDeviceEnabled)
        {
          gdk_x11_display_error_trap_push (display);
          info = XIQueryDevice (xdisplay, ev->info[i].deviceid, &ndevices);
          gdk_x11_display_error_trap_pop_ignored (display);
          if (info)
            {
              add_device (device_manager, &info[0], TRUE);
              XIFreeDeviceInfo (info);
            }
        }
      else if (ev->info[i].flags & XIDeviceDisabled)
        remove_device (device_manager, ev->info[i].deviceid);
      else if (ev->info[i].flags & XISlaveAttached ||
               ev->info[i].flags & XISlaveDetached)
        {
          GdkDevice *master, *slave;
          GdkSeat *seat;

          slave = g_hash_table_lookup (device_manager->id_table,
                                       GINT_TO_POINTER (ev->info[i].deviceid));

          if (!slave)
            continue;

          /* Remove old master info */
          master = gdk_device_get_associated_device (slave);

          if (master)
            {
              _gdk_device_remove_slave (master, slave);
              _gdk_device_set_associated_device (slave, NULL);

              g_signal_emit_by_name (device_manager, "device-changed", master);

              seat = gdk_device_get_seat (master);
              gdk_seat_default_remove_slave (GDK_SEAT_DEFAULT (seat), slave);
            }

          /* Add new master if it's an attachment event */
          if (ev->info[i].flags & XISlaveAttached)
            {
              gdk_x11_display_error_trap_push (display);
              info = XIQueryDevice (xdisplay, ev->info[i].deviceid, &ndevices);
              gdk_x11_display_error_trap_pop_ignored (display);
              if (info)
                {
                  master = g_hash_table_lookup (device_manager->id_table,
                                                GINT_TO_POINTER (info->attachment));
                  XIFreeDeviceInfo (info);
                }

              if (master)
                {
                  _gdk_device_set_associated_device (slave, master);
                  _gdk_device_add_slave (master, slave);

                  seat = gdk_device_get_seat (master);
                  gdk_seat_default_add_slave (GDK_SEAT_DEFAULT (seat), slave);

                  g_signal_emit_by_name (device_manager, "device-changed", master);
                }
            }

          g_signal_emit_by_name (device_manager, "device-changed", slave);
        }
    }
}

static void
handle_device_changed (GdkX11DeviceManagerXI2 *device_manager,
                       XIDeviceChangedEvent   *ev)
{
  GdkDisplay *display;
  GdkDevice *device, *source_device;

  display = gdk_device_manager_get_display (GDK_DEVICE_MANAGER (device_manager));
  device = g_hash_table_lookup (device_manager->id_table,
                                GUINT_TO_POINTER (ev->deviceid));
  source_device = g_hash_table_lookup (device_manager->id_table,
                                       GUINT_TO_POINTER (ev->sourceid));

  if (device)
    {
      _gdk_device_reset_axes (device);
      _gdk_device_xi2_unset_scroll_valuators ((GdkX11DeviceXI2 *) device);
      gdk_x11_device_xi2_store_axes (GDK_X11_DEVICE_XI2 (device), NULL, 0);
      translate_device_classes (display, device, ev->classes, ev->num_classes);

      g_signal_emit_by_name (G_OBJECT (device), "changed");
    }

  if (source_device)
    _gdk_device_xi2_reset_scroll_valuators (GDK_X11_DEVICE_XI2 (source_device));
}