/* 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 "gdkdevice-xi2-private.h"
#include "gdkdeviceprivate.h"
#include "gdkdevicetoolprivate.h"
#include "gdkdisplayprivate.h"
#include "gdkeventsprivate.h"
#include "gdkeventtranslatorprivate.h"
#include "gdkkeys-x11.h"
#include "gdkprivate-x11.h"
#include "gdkdisplay-x11.h"
#include <glib/gi18n-lib.h>
#include "gdkkeysyms.h"
#include "gdkseat-xi2-private.h"

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

#include <string.h>

G_GNUC_BEGIN_IGNORE_DEPRECATIONS

static const char notify_modes[][19] = {
  "NotifyNormal",
  "NotifyGrab",
  "NotifyUngrab",
  "NotifyWhileGrabbed"
};

static const char notify_details[][23] = {
  "NotifyAncestor",
  "NotifyVirtual",
  "NotifyInferior",
  "NotifyNonlinear",
  "NotifyNonlinearVirtual",
  "NotifyPointer",
  "NotifyPointerRoot",
  "NotifyDetailNone"
};

#define HAS_FOCUS(toplevel)                           \
  ((toplevel)->has_focus || (toplevel)->has_pointer_focus)

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
{
  GObject parent_object;

  GdkDisplay *display;
  GHashTable *id_table;

  GList *devices;

  int opcode;
  int major;
  int minor;
};

struct _GdkX11DeviceManagerXI2Class
{
  GObjectClass 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, G_TYPE_OBJECT,
                         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 GdkEvent * gdk_x11_device_manager_xi2_translate_event (GdkEventTranslator *translator,
                                                               GdkDisplay         *display,
                                                               const XEvent       *xevent);
static GdkEventMask gdk_x11_device_manager_xi2_get_handled_events   (GdkEventTranslator *translator);
static void         gdk_x11_device_manager_xi2_select_surface_events (GdkEventTranslator *translator,
                                                                     Window              window,
                                                                     GdkEventMask        event_mask);
static GdkSurface *  gdk_x11_device_manager_xi2_get_surface         (GdkEventTranslator *translator,
                                                                     const XEvent       *xevent);

enum {
  PROP_0,
  PROP_DISPLAY,
  PROP_OPCODE,
  PROP_MAJOR,
  PROP_MINOR,
  N_PROPS
};

static GParamSpec *props[N_PROPS] = { NULL, };

static void
gdk_x11_device_manager_xi2_class_init (GdkX11DeviceManagerXI2Class *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;

  props[PROP_DISPLAY] = g_param_spec_object ("display", NULL, NULL,
                                             GDK_TYPE_DISPLAY,
                                             G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
                                             G_PARAM_STATIC_NAME);
  props[PROP_OPCODE] = g_param_spec_int ("opcode", NULL, NULL,
                                         0, G_MAXINT, 0,
                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
                                         G_PARAM_STATIC_NAME);
  props[PROP_MAJOR] = g_param_spec_int ("major", NULL, NULL,
                                        0, G_MAXINT, 0,
                                        G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
                                        G_PARAM_STATIC_NAME);
  props[PROP_MINOR] = g_param_spec_int ("minor", NULL, NULL,
                                        0, G_MAXINT, 0,
                                        G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
                                        G_PARAM_STATIC_NAME);

  g_object_class_install_properties (object_class, N_PROPS, props);
}

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 (GdkX11DeviceManagerXI2 *device_manager,
                                           Window                  xwindow,
                                           XIEventMask            *event_mask)
{
  GdkDisplay *display;
  Display *xdisplay;

  display = device_manager->display;
  xdisplay = GDK_DISPLAY_XDISPLAY (display);

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

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

  _gdk_device_add_axis (device, use, min, max, resolution);
  if (GDK_DISPLAY_DEBUG_CHECK (display, INPUT))
    {
      const char *label;

      if (valuator_label != None)
        label = gdk_x11_get_xatom_name_for_display (display, valuator_label);
      else
        label = NULL;

      gdk_debug_message ("\n\taxis: %s %s", label, use == GDK_AXIS_IGNORE ? "(ignored)" : "(used)");
    }
}

static void
translate_device_classes (GdkDisplay      *display,
                          GdkDevice       *device,
                          XIAnyClassInfo **classes,
                          guint            n_classes)
{
  int 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:
          {
            /* Not used */
          }
          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_DISPLAY_DEBUG (display, INPUT, "\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);
          }
          break;
#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,
                 int             *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,
                char         **vendor_id,
                char         **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
has_bool_prop (GdkDisplay   *display,
               XIDeviceInfo *info,
               const char   *prop_name)
{
  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, prop_name),
                      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 gboolean
is_touchpad_device (GdkDisplay   *display,
                    XIDeviceInfo *info)
{
  /*
   * Touchpads are heuristically recognized via XI properties that the various
   * Xorg drivers expose:
   *   libinput:  libinput Tapping Enabled
   *   synaptics: Synaptics Off
   *   cmt:       Raw Touch Passthrough
   */
  return has_bool_prop (display, info, "libinput Tapping Enabled") ||
         has_bool_prop (display, info, "Synaptics Off") ||
         has_bool_prop (display, info, "Raw Touch Passthrough");
}

static GdkDevice *
create_device (GdkX11DeviceManagerXI2 *device_manager,
               GdkDisplay             *display,
               XIDeviceInfo           *dev,
               const char             *name,
               int                     source)
{
  GdkInputSource input_source;
  GdkInputSource touch_source;
  GdkX11DeviceType type;
  GdkDevice *device;
  int num_touches = 0;
  char *vendor_id = NULL, *product_id = NULL;

  if (!name)
    name = dev->name;

  if (source > 0)
    input_source = source;
  else 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
    {
      char *tmp_name;

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

      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") ||
               strstr (tmp_name, "eraser"))
        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_X11_DEVICE_TYPE_LOGICAL;
      break;
    case XISlaveKeyboard:
    case XISlavePointer:
      type = GDK_X11_DEVICE_TYPE_PHYSICAL;
      break;
    case XIFloatingSlave:
    default:
      type = GDK_X11_DEVICE_TYPE_FLOATING;
      break;
    }

  if (GDK_DISPLAY_DEBUG_CHECK (display, INPUT))
    {
      const char *type_names[] = { "logical", "physical", "floating" };
      const char *source_names[] = { "mouse", "pen", "keyboard", "direct touch", "indirect touch", "trackpoint", "pad" };
      gdk_debug_message ("input device:\n\tname: %s\n\ttype: %s\n\tsource: %s\n\thas cursor: %d\n\ttouches: %d",
                         dev->name,
                         type_names[type],
                         source_names[input_source],
                         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", name,
                         "source", input_source,
                         "has-cursor", (dev->use == XIMasterPointer),
                         "display", display,
                         "device-id", dev->deviceid,
                         "vendor-id", vendor_id,
                         "product-id", product_id,
                         "num-touches", num_touches,
                         NULL);
  gdk_x11_device_xi2_set_device_type ((GdkX11DeviceXI2 *) device, type);

  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 = device_manager->display;
  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_x11_seat_xi2_new_for_logical_pair (pointer, keyboard);
      gdk_display_add_seat (display, seat);
      g_object_unref (seat);
    }
}

static void
ensure_logical_touch_device (gpointer key,
                             gpointer value,
                             gpointer user_data)
{
  GdkX11DeviceManagerXI2 *device_manager;
  GdkDevice *physical, *logical_pointer, *logical_touch;
  GdkDisplay *display;
  GdkSeat *seat;
  XIDeviceInfo *info;
  Display *xdisplay;
  int logical_pointer_id;
  int ndevices;
  char *name;

  device_manager = user_data;
  physical = g_hash_table_lookup (device_manager->id_table, key);

  if (gdk_device_get_source (physical) != GDK_SOURCE_TOUCHSCREEN)
    return;

  logical_pointer = g_hash_table_lookup (device_manager->id_table, value);
  seat = gdk_device_get_seat (logical_pointer);
  logical_touch = gdk_x11_seat_xi2_get_logical_touch (GDK_X11_SEAT_XI2 (seat));

  if (logical_touch)
    return;

  display = device_manager->display;
  xdisplay = GDK_DISPLAY_XDISPLAY (display);
  logical_pointer_id = _gdk_x11_device_xi2_get_id (GDK_X11_DEVICE_XI2 (logical_pointer));
  info = XIQueryDevice (xdisplay, logical_pointer_id, &ndevices);
  g_return_if_fail (ndevices > 0);

  name = g_strdup_printf ("%s touch", gdk_device_get_name (logical_pointer));
  logical_touch = create_device (device_manager, display, &info[0], name, GDK_SOURCE_TOUCHSCREEN);

  gdk_x11_seat_xi2_set_logical_touch (GDK_X11_SEAT_XI2 (seat), logical_touch);

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

  XIFreeDeviceInfo (info);
  g_free (name);
}

static void
remove_logical_touch_device (GdkX11DeviceManagerXI2 *device_manager,
                             GdkDevice              *associated)
{
  GdkSeat *seat;
  GdkDevice *logical_touch;

  seat = gdk_device_get_seat (associated);
  if (!seat)
    return;

  logical_touch = gdk_x11_seat_xi2_get_logical_touch (GDK_X11_SEAT_XI2 (seat));
  device_manager->devices = g_list_remove (device_manager->devices, logical_touch);
  gdk_x11_seat_xi2_set_logical_touch (GDK_X11_SEAT_XI2 (seat), NULL);
}

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

  display = device_manager->display;
  device = create_device (device_manager, display, dev, NULL, -1);

  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 *logical;
          GdkSeat *seat;

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

          _gdk_device_set_associated_device (device, logical);
          _gdk_device_add_physical_device (logical, device);

          seat = gdk_device_get_seat (logical);
          gdk_x11_seat_xi2_add_physical_device (GDK_X11_SEAT_XI2 (seat), device);

          ensure_logical_touch_device (GINT_TO_POINTER (dev->deviceid),
                                       GINT_TO_POINTER (dev->attachment),
                                       device_manager);
        }
      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);
            }
        }
    }

  return device;
}

static void
detach_from_seat (GdkDevice *device)
{
  GdkSeat *seat = gdk_device_get_seat (device);
  GdkX11DeviceXI2 *device_xi2 = (GdkX11DeviceXI2 *) device;

  if (!seat)
    return;

  if (gdk_x11_device_xi2_get_device_type (device_xi2) == GDK_X11_DEVICE_TYPE_LOGICAL)
    gdk_display_remove_seat (gdk_device_get_display (device), seat);
  else if (gdk_x11_device_xi2_get_device_type (device_xi2) == GDK_X11_DEVICE_TYPE_PHYSICAL)
    gdk_x11_seat_xi2_remove_physical_device (GDK_X11_SEAT_XI2 (seat), device);
}

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

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

  if (device)
    {
      remove_logical_touch_device (device_manager, 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_object_run_dispose (G_OBJECT (device));
      g_object_unref (device);
    }
}

static void
relate_logical_devices (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_physical_devices (gpointer key,
                         gpointer value,
                         gpointer user_data)
{
  GdkX11DeviceManagerXI2 *device_manager;
  GdkDevice *physical, *logical;
  GdkSeat *seat;

  device_manager = user_data;
  physical = g_hash_table_lookup (device_manager->id_table, key);
  logical = g_hash_table_lookup (device_manager->id_table, value);

  _gdk_device_set_associated_device (physical, logical);
  _gdk_device_add_physical_device (logical, physical);

  seat = gdk_device_get_seat (logical);
  gdk_x11_seat_xi2_add_physical_device (GDK_X11_SEAT_XI2 (seat), physical);
}

static void
gdk_x11_device_manager_xi2_constructed (GObject *object)
{
  GdkX11DeviceManagerXI2 *device_manager;
  GdkDisplay *display;
  GHashTable *logical_devices, *physical_devices;
  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 = device_manager->display;
  xdisplay = GDK_DISPLAY_XDISPLAY (display);

  g_assert (device_manager->major == 2);

  logical_devices = g_hash_table_new (NULL, NULL);
  physical_devices = 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 (logical_devices,
                               GINT_TO_POINTER (dev->deviceid),
                               GINT_TO_POINTER (dev->attachment));
        }
      else if (dev->use == XISlavePointer ||
               dev->use == XISlaveKeyboard)
        {
          g_hash_table_insert (physical_devices,
                               GINT_TO_POINTER (dev->deviceid),
                               GINT_TO_POINTER (dev->attachment));
        }
    }

  XIFreeDeviceInfo (info);

  /* Stablish relationships between devices */
  g_hash_table_foreach (logical_devices, relate_logical_devices, object);
  g_hash_table_destroy (logical_devices);

  g_hash_table_foreach (physical_devices, relate_physical_devices, object);
  g_hash_table_foreach (physical_devices, ensure_logical_touch_device, object);
  g_hash_table_destroy (physical_devices);

  /* Connect to hierarchy change events */
  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 (device_manager,
                                             GDK_DISPLAY_XROOTWIN (display),
                                             &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;

  g_clear_pointer (&device_manager->id_table, g_hash_table_destroy);

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

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_DISPLAY:
      device_manager->display = g_value_get_object (value);
      break;
    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_DISPLAY:
      g_value_set_object (value, device_manager->display);
      break;
    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_surface_events = gdk_x11_device_manager_xi2_select_surface_events;
  iface->get_surface = gdk_x11_device_manager_xi2_get_surface;
}

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

  display = device_manager->display;
  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 *logical = NULL, *physical;
          GdkSeat *seat;

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

          if (!physical)
            continue;

          seat = gdk_device_get_seat (physical);
          gdk_x11_seat_xi2_remove_physical_device (GDK_X11_SEAT_XI2 (seat), physical);

          /* Add new logical device 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)
                {
                  logical = g_hash_table_lookup (device_manager->id_table,
                                                 GINT_TO_POINTER (info->attachment));
                  XIFreeDeviceInfo (info);
                }

              if (logical != NULL)
                {
                  int logical_id = _gdk_x11_device_xi2_get_id (GDK_X11_DEVICE_XI2 (logical));
                  _gdk_device_set_associated_device (physical, logical);
                  _gdk_device_add_physical_device (logical, physical);

                  seat = gdk_device_get_seat (logical);
                  gdk_x11_seat_xi2_add_physical_device (GDK_X11_SEAT_XI2 (seat), physical);
                  ensure_logical_touch_device (GINT_TO_POINTER (ev->info[i].deviceid), GINT_TO_POINTER (logical_id), device_manager);
                }
            }
        }
    }
}

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

  display = device_manager->display;
  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));
}

static gboolean
device_get_tool_serial_and_id (GdkDevice *device,
                               guint     *serial_id,
                               guint     *id)
{
  GdkDisplay *display;
  gulong nitems, bytes_after;
  guint32 *data;
  int rc, format;
  Atom type;

  display = gdk_device_get_display (device);

  gdk_x11_display_error_trap_push (display);

  rc = XIGetProperty (GDK_DISPLAY_XDISPLAY (display),
                      gdk_x11_device_get_id (device),
                      gdk_x11_get_xatom_by_name_for_display (display, "Wacom Serial IDs"),
                      0, 5, False, XA_INTEGER, &type, &format, &nitems, &bytes_after,
                      (guchar **) &data);
  gdk_x11_display_error_trap_pop_ignored (display);

  if (rc != Success)
    return FALSE;

  if (type == XA_INTEGER && format == 32)
    {
      if (nitems >= 4)
        *serial_id = data[3];
      if (nitems >= 5)
        *id = data[4];
    }

  XFree (data);

  return TRUE;
}

static GdkDeviceToolType
device_get_tool_type (GdkDevice *device)
{
  GdkDisplay *display;
  gulong nitems, bytes_after;
  guint32 *data;
  int rc, format;
  Atom type;
  Atom device_type;
  Atom types[N_WACOM_TYPE_ATOMS];
  GdkDeviceToolType tool_type = GDK_DEVICE_TOOL_TYPE_UNKNOWN;

  display = gdk_device_get_display (device);
  gdk_x11_display_error_trap_push (display);

  rc = XIGetProperty (GDK_DISPLAY_XDISPLAY (display),
                      gdk_x11_device_get_id (device),
                      gdk_x11_get_xatom_by_name_for_display (display, "Wacom Tool Type"),
                      0, 1, False, XA_ATOM, &type, &format, &nitems, &bytes_after,
                      (guchar **) &data);
  gdk_x11_display_error_trap_pop_ignored (display);

  if (rc != Success)
    return GDK_DEVICE_TOOL_TYPE_UNKNOWN;

  if (type != XA_ATOM || format != 32 || nitems != 1)
    {
      XFree (data);
      return GDK_DEVICE_TOOL_TYPE_UNKNOWN;
    }

  device_type = *data;
  XFree (data);

  if (device_type == 0)
    return GDK_DEVICE_TOOL_TYPE_UNKNOWN;

  gdk_x11_display_error_trap_push (display);
  rc = XInternAtoms (GDK_DISPLAY_XDISPLAY (display),
                     (char **) wacom_type_atoms,
                     N_WACOM_TYPE_ATOMS,
                     False,
                     types);
  gdk_x11_display_error_trap_pop_ignored (display);

  if (rc == 0)
    return GDK_DEVICE_TOOL_TYPE_UNKNOWN;

  if (device_type == types[WACOM_TYPE_STYLUS])
    tool_type = GDK_DEVICE_TOOL_TYPE_PEN;
  else if (device_type == types[WACOM_TYPE_CURSOR])
    tool_type = GDK_DEVICE_TOOL_TYPE_MOUSE;
  else if (device_type == types[WACOM_TYPE_ERASER])
    tool_type = GDK_DEVICE_TOOL_TYPE_ERASER;
  else if (device_type == types[WACOM_TYPE_TOUCH])
    tool_type = GDK_DEVICE_TOOL_TYPE_UNKNOWN;

  return tool_type;
}

static void
handle_property_change (GdkX11DeviceManagerXI2 *device_manager,
                        XIPropertyEvent        *ev)
{
  GdkDevice *device;

  device = g_hash_table_lookup (device_manager->id_table,
                                GUINT_TO_POINTER (ev->deviceid));

  if (device != NULL &&
      ev->property == gdk_x11_get_xatom_by_name_for_display (gdk_device_get_display (device), "Wacom Serial IDs"))
    {
      GdkDeviceTool *tool = NULL;
      guint serial_id = 0, tool_id = 0;
      GdkSeat *seat;

      if (ev->what != XIPropertyDeleted &&
          device_get_tool_serial_and_id (device, &serial_id, &tool_id))
        {
          GdkDeviceToolType tool_type;

          seat = gdk_device_get_seat (device);
          tool_type = device_get_tool_type (device);

          if (tool_type != GDK_DEVICE_TOOL_TYPE_UNKNOWN)
            {
              tool = gdk_seat_get_tool (seat, serial_id, tool_id, tool_type);

              if (!tool && serial_id > 0)
                {
                  tool = gdk_device_tool_new (serial_id, tool_id, tool_type, 0);
                  gdk_x11_seat_xi2_add_tool (GDK_X11_SEAT_XI2 (seat), tool);
                }
            }
        }

      gdk_device_update_tool (device, tool);
    }
}

static GdkCrossingMode
translate_crossing_mode (int mode)
{
  switch (mode)
    {
    case XINotifyNormal:
      return GDK_CROSSING_NORMAL;
    case XINotifyGrab:
    case XINotifyPassiveGrab:
      return GDK_CROSSING_GRAB;
    case XINotifyUngrab:
    case XINotifyPassiveUngrab:
      return GDK_CROSSING_UNGRAB;
    case XINotifyWhileGrabbed:
      /* Fall through, unexpected in pointer crossing events */
    default:
      g_assert_not_reached ();
      return GDK_CROSSING_NORMAL;
    }
}

static GdkNotifyType
translate_notify_type (int detail)
{
  switch (detail)
    {
    case NotifyInferior:
      return GDK_NOTIFY_INFERIOR;
    case NotifyAncestor:
      return GDK_NOTIFY_ANCESTOR;
    case NotifyVirtual:
      return GDK_NOTIFY_VIRTUAL;
    case NotifyNonlinear:
      return GDK_NOTIFY_NONLINEAR;
    case NotifyNonlinearVirtual:
      return GDK_NOTIFY_NONLINEAR_VIRTUAL;
    default:
      g_assert_not_reached ();
      return GDK_NOTIFY_UNKNOWN;
    }
}

static void
set_user_time (GdkEvent *event)
{
  GdkSurface *surface;
  guint32 time;

  surface = gdk_event_get_surface (event);
  g_return_if_fail (GDK_IS_SURFACE (surface));

  time = gdk_event_get_time (event);

  /* If an event doesn't have a valid timestamp, we shouldn't use it
   * to update the latest user interaction time.
   */
  if (time != GDK_CURRENT_TIME)
    gdk_x11_surface_set_user_time (surface, time);
}

static double *
translate_axes (GdkDevice       *device,
                double           x,
                double           y,
                GdkSurface       *surface,
                XIValuatorState *valuators)
{
  guint n_axes, i;
  double *axes;
  double *vals;

  n_axes = gdk_device_get_n_axes (device);
  axes = g_new0 (double, GDK_AXIS_LAST);
  vals = valuators->values;

  for (i = 0; i < MIN (valuators->mask_len * 8, n_axes); i++)
    {
      GdkAxisUse use;
      double val;

      if (!XIMaskIsSet (valuators->mask, i))
        continue;

      use = gdk_device_get_axis_use (device, i);
      val = *vals++;

      switch ((guint) use)
        {
        case GDK_AXIS_X:
        case GDK_AXIS_Y:
            {
              if (use == GDK_AXIS_X)
                axes[use] = x;
              else
                axes[use] = y;
            }
          break;
        default:
          _gdk_device_translate_axis (device, i, val, &axes[use]);
          break;
        }
    }

  gdk_x11_device_xi2_store_axes (GDK_X11_DEVICE_XI2 (device), axes, n_axes);

  return axes;
}

static gboolean
get_event_surface (GdkEventTranslator *translator,
                  XIEvent            *ev,
                  GdkSurface         **surface_p)
{
  GdkX11DeviceManagerXI2 *device_manager = GDK_X11_DEVICE_MANAGER_XI2 (translator);
  GdkDisplay *display;
  GdkSurface *surface = NULL;
  gboolean should_have_window = TRUE;

  display = device_manager->display;

  switch (ev->evtype)
    {
    case XI_KeyPress:
    case XI_KeyRelease:
    case XI_ButtonPress:
    case XI_ButtonRelease:
    case XI_Motion:
#ifdef XINPUT_2_2
    case XI_TouchUpdate:
    case XI_TouchBegin:
    case XI_TouchEnd:
#endif /* XINPUT_2_2 */
      {
        XIDeviceEvent *xev = (XIDeviceEvent *) ev;

        surface = gdk_x11_surface_lookup_for_display (display, xev->event);
      }
      break;
#ifdef XINPUT_2_4
    case XI_GesturePinchBegin:
    case XI_GesturePinchUpdate:
    case XI_GesturePinchEnd:
      {
        XIGesturePinchEvent *xev = (XIGesturePinchEvent *) ev;

        surface = gdk_x11_surface_lookup_for_display (display, xev->event);
      }
      break;
    case XI_GestureSwipeBegin:
    case XI_GestureSwipeUpdate:
    case XI_GestureSwipeEnd:
      {
        XIGestureSwipeEvent *xev = (XIGestureSwipeEvent *) ev;

        surface = gdk_x11_surface_lookup_for_display (display, xev->event);
      }
      break;
#endif /* XINPUT_2_4 */
    case XI_Enter:
    case XI_Leave:
    case XI_FocusIn:
    case XI_FocusOut:
      {
        XIEnterEvent *xev = (XIEnterEvent *) ev;

        surface = gdk_x11_surface_lookup_for_display (display, xev->event);
      }
      break;
    default:
      should_have_window = FALSE;
      break;
    }

  *surface_p = surface;

  if (should_have_window && !surface)
    return FALSE;

  return TRUE;
}

static gboolean
scroll_valuators_changed (GdkX11DeviceXI2 *device,
                          XIValuatorState *valuators,
                          double          *dx,
                          double          *dy)
{
  gboolean has_scroll_valuators = FALSE;
  GdkScrollDirection direction;
  guint n_axes, i, n_val;
  double *vals;

  n_axes = gdk_device_get_n_axes (GDK_DEVICE (device));
  vals = valuators->values;
  *dx = *dy = 0;
  n_val = 0;

  for (i = 0; i < MIN (valuators->mask_len * 8, n_axes); i++)
    {
      double delta;

      if (!XIMaskIsSet (valuators->mask, i))
        continue;

      if (_gdk_x11_device_xi2_get_scroll_delta (device, i, vals[n_val],
                                                &direction, &delta))
        {
          has_scroll_valuators = TRUE;

          if (direction == GDK_SCROLL_UP ||
              direction == GDK_SCROLL_DOWN)
            *dy = delta;
          else
            *dx = delta;
        }

      n_val++;
    }

  return has_scroll_valuators;
}

/* We only care about focus events that indicate that _this_
 * surface (not an ancestor or child) got or lost the focus
 */
static void
_gdk_device_manager_xi2_handle_focus (GdkSurface *surface,
                                      Window      original,
                                      GdkDevice  *device,
                                      GdkDevice  *source_device,
                                      gboolean    focus_in,
                                      int         detail,
                                      int         mode)
{
  GdkToplevelX11 *toplevel;
  GdkX11Screen *x11_screen;
  gboolean had_focus;

  g_return_if_fail (GDK_IS_SURFACE (surface));
  g_return_if_fail (GDK_IS_DEVICE (device));
  g_return_if_fail (source_device == NULL || GDK_IS_DEVICE (source_device));

  GDK_DISPLAY_DEBUG (gdk_surface_get_display (surface), EVENTS,
                     "focus out:\t\twindow: %ld, detail: %s, mode: %s",
                     GDK_SURFACE_XID (surface),
                     notify_details[detail],
                     notify_modes[mode]);

  toplevel = _gdk_x11_surface_get_toplevel (surface);

  if (!toplevel)
    return;

  if (toplevel->focus_window == original)
    return;

  had_focus = HAS_FOCUS (toplevel);
  x11_screen = GDK_X11_SCREEN (GDK_SURFACE_SCREEN (surface));

  switch (detail)
    {
    case NotifyAncestor:
    case NotifyVirtual:
      /* When the focus moves from an ancestor of the window to
       * the window or a descendent of the window, *and* the
       * pointer is inside the window, then we were previously
       * receiving keystroke events in the has_pointer_focus
       * case and are now receiving them in the
       * has_focus_window case.
       */
      if (toplevel->has_pointer &&
          !x11_screen->wmspec_check_window &&
          mode != NotifyGrab &&
          mode != XINotifyPassiveGrab &&
          mode != XINotifyPassiveUngrab &&
          mode != NotifyUngrab)
        toplevel->has_pointer_focus = (focus_in) ? FALSE : TRUE;
      G_GNUC_FALLTHROUGH;

    case NotifyNonlinear:
    case NotifyNonlinearVirtual:
      if (mode != NotifyGrab &&
          mode != XINotifyPassiveGrab &&
          mode != XINotifyPassiveUngrab &&
          mode != NotifyUngrab)
        toplevel->has_focus_window = (focus_in) ? TRUE : FALSE;
      /* We pretend that the focus moves to the grab
       * window, so we pay attention to NotifyGrab
       * NotifyUngrab, and ignore NotifyWhileGrabbed
       */
      if (mode != NotifyWhileGrabbed)
        toplevel->has_focus = (focus_in) ? TRUE : FALSE;
      break;
    case NotifyPointer:
      /* The X server sends NotifyPointer/NotifyGrab,
       * but the pointer focus is ignored while a
       * grab is in effect
       */
      if (!x11_screen->wmspec_check_window &&
          mode != NotifyGrab &&
          mode != XINotifyPassiveGrab &&
          mode != XINotifyPassiveUngrab &&
          mode != NotifyUngrab)
        toplevel->has_pointer_focus = (focus_in) ? TRUE : FALSE;
      break;
    case NotifyInferior:
    case NotifyPointerRoot:
    case NotifyDetailNone:
    default:
      break;
    }

  if (HAS_FOCUS (toplevel) != had_focus)
    {
      GdkEvent *event;

      event = gdk_focus_event_new (surface, device, focus_in);
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
      gdk_display_put_event (gdk_surface_get_display (surface), event);
G_GNUC_END_IGNORE_DEPRECATIONS
      gdk_event_unref (event);
    }
}

static GdkEvent *
gdk_x11_device_manager_xi2_translate_event (GdkEventTranslator *translator,
                                            GdkDisplay         *display,
                                            const XEvent       *xevent)
{
  GdkX11DeviceManagerXI2 *device_manager;
  const XGenericEventCookie *cookie;
  GdkDevice *device, *source_device;
  GdkSurface *surface;
  GdkX11Surface *impl;
  int scale;
  XIEvent *ev;
  GdkEvent *event;

  event = NULL;

  device_manager = (GdkX11DeviceManagerXI2 *) translator;
  cookie = &xevent->xcookie;

  if (xevent->type != GenericEvent ||
      cookie->extension != device_manager->opcode)
    return event;

  ev = (XIEvent *) cookie->data;

  if (!ev)
    return NULL;

  if (!get_event_surface (translator, ev, &surface))
    return NULL;

  if (surface && GDK_SURFACE_DESTROYED (surface))
    return NULL;

  scale = 1;
  if (surface)
    {
      impl = GDK_X11_SURFACE (surface);
      scale = impl->surface_scale;
    }

  if (ev->evtype == XI_Motion ||
      ev->evtype == XI_ButtonRelease)
    {
      if (_gdk_x11_moveresize_handle_event (xevent))
        return NULL;
    }

  switch (ev->evtype)
    {
    case XI_HierarchyChanged:
      handle_hierarchy_changed (device_manager,
                                (XIHierarchyEvent *) ev);
      break;
    case XI_DeviceChanged:
      handle_device_changed (device_manager,
                             (XIDeviceChangedEvent *) ev);
      break;
    case XI_PropertyEvent:
      handle_property_change (device_manager,
                              (XIPropertyEvent *) ev);
      break;
    case XI_KeyPress:
    case XI_KeyRelease:
      {
        XIDeviceEvent *xev = (XIDeviceEvent *) ev;
        GdkKeymap *keymap = gdk_display_get_keymap (display);
        GdkModifierType consumed, state, orig_state;
        int layout, level;
        guint keyval;
        GdkTranslatedKey translated;
        GdkTranslatedKey no_lock;

        state = _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group);

        device = g_hash_table_lookup (device_manager->id_table,
                                      GUINT_TO_POINTER (xev->deviceid));

        source_device = g_hash_table_lookup (device_manager->id_table,
                                             GUINT_TO_POINTER (xev->sourceid));

        keyval = GDK_KEY_VoidSymbol;

        gdk_keymap_translate_keyboard_state (keymap,
                                             xev->detail,
                                             state,
                                             xev->group.effective,
                                             &keyval,
                                             &layout, &level, &consumed);
        orig_state = state;
        state &= ~consumed;
        _gdk_x11_keymap_add_virt_mods (keymap, &state);
        state |= orig_state;

        GDK_DISPLAY_DEBUG (display, EVENTS,
                           "key %s:\twindow %ld\n"
                           "\tdevice:%u\n"
                           "\tsource device:%u\n"
                           "\tkey number: %u (%s)\n",
                           (ev->evtype == XI_KeyPress) ? "press" : "release",
                           xev->event,
                           xev->deviceid,
                           xev->sourceid,
                           xev->detail,
                           gdk_keyval_name (keyval));

        translated.keyval = keyval;
        translated.consumed = consumed;
        translated.layout = layout;
        translated.level = level;

        if (orig_state & GDK_LOCK_MASK)
          {
            orig_state &= ~GDK_LOCK_MASK;

            gdk_keymap_translate_keyboard_state (keymap,
                                                 xev->detail,
                                                 orig_state,
                                                 xev->group.effective,
                                                 &keyval,
                                                 &layout, &level, &consumed);

            no_lock.keyval = keyval;
            no_lock.consumed = consumed;
            no_lock.layout = layout;
            no_lock.level = level;
          }
        else
          {
            no_lock = translated;
          }
        event = gdk_key_event_new (xev->evtype == XI_KeyPress
                                     ? GDK_KEY_PRESS
                                     : GDK_KEY_RELEASE,
                                   surface,
                                   device,
                                   xev->time,
                                   xev->detail,
                                   state,
                                   gdk_x11_keymap_key_is_modifier (keymap, xev->detail),
                                   &translated,
                                   &no_lock,
                                   NULL);

        if (ev->evtype == XI_KeyPress)
          set_user_time (event);

        /* FIXME: emulate autorepeat on key
         * release? XI2 seems attached to Xkb.
         */
      }

      break;
    case XI_ButtonPress:
    case XI_ButtonRelease:
      {
        XIDeviceEvent *xev = (XIDeviceEvent *) ev;

        GDK_DISPLAY_DEBUG (display, EVENTS,
                           "button %s:\twindow %ld\n"
                           "\tdevice:%u\n"
                           "\tsource device:%u\n"
                           "\tbutton number: %u\n"
                           "\tx,y: %.2f %.2f",
                           (ev->evtype == XI_ButtonPress) ? "press" : "release",
                           xev->event,
                           xev->deviceid,
                           xev->sourceid,
                           xev->detail,
                           xev->event_x, xev->event_y);

        if (ev->evtype == XI_ButtonRelease &&
            (xev->detail >= 4 && xev->detail <= 7))
          return FALSE;
        else if (ev->evtype == XI_ButtonPress &&
                 (xev->detail >= 4 && xev->detail <= 7))
          {
            GdkScrollDirection direction;

            /* Button presses of button 4-7 are scroll events */

#ifdef XINPUT_2_2
            if (xev->flags & XIPointerEmulated)
              return FALSE;
#endif
            if (xev->detail == 4)
              direction = GDK_SCROLL_UP;
            else if (xev->detail == 5)
              direction = GDK_SCROLL_DOWN;
            else if (xev->detail == 6)
              direction = GDK_SCROLL_LEFT;
            else
              direction = GDK_SCROLL_RIGHT;

            device = g_hash_table_lookup (device_manager->id_table,
                                          GUINT_TO_POINTER (xev->deviceid));

            source_device = g_hash_table_lookup (device_manager->id_table,
                                                 GUINT_TO_POINTER (xev->sourceid));

            event = gdk_scroll_event_new_discrete (surface,
                                                   source_device,
                                                   NULL,
                                                   xev->time,
                                                   _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group),
                                                   direction,
                                                   GDK_SCROLL_RELATIVE_DIRECTION_UNKNOWN);

          }
        else
          {
            double x, y;
            double *axes;

            device = g_hash_table_lookup (device_manager->id_table,
                                          GUINT_TO_POINTER (xev->deviceid));

            source_device = g_hash_table_lookup (device_manager->id_table,
                                                 GUINT_TO_POINTER (xev->sourceid));

            axes = translate_axes (device,
                                   (double) xev->event_x / scale,
                                   (double) xev->event_y / scale,
                                   surface,
                                   &xev->valuators);

             x = (double) xev->event_x / scale;
             y = (double) xev->event_y / scale;

            event = gdk_button_event_new (ev->evtype == XI_ButtonPress
                                            ? GDK_BUTTON_PRESS
                                            : GDK_BUTTON_RELEASE,
                                          surface,
                                          device,
                                          source_device->last_tool,
                                          xev->time,
                                          _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group),
                                          xev->detail,
                                          x, y,
                                          axes);
          }

        if (ev->evtype == XI_ButtonPress)
   set_user_time (event);

        break;
      }

    case XI_Motion:
      {
        XIDeviceEvent *xev = (XIDeviceEvent *) ev;
        double delta_x, delta_y;

        double x, y;
        double *axes;

        source_device = g_hash_table_lookup (device_manager->id_table,
                                             GUINT_TO_POINTER (xev->sourceid));
        device = g_hash_table_lookup (device_manager->id_table,
                                      GUINT_TO_POINTER (xev->deviceid));

        /* When scrolling, X might send events twice here; once with both the
         * device and the source device set to the physical device, and once
         * with the device set to the logical device.
         *
         * Since we are only interested in the latter, and
         * scroll_valuators_changed() updates the valuator cache for the
         * source device, we need to explicitly ignore the first event in
         * order to get the correct delta for the second.
         */
        if (gdk_x11_device_xi2_get_device_type ((GdkX11DeviceXI2 *) device) != GDK_X11_DEVICE_TYPE_PHYSICAL &&
            scroll_valuators_changed (GDK_X11_DEVICE_XI2 (source_device),
                                      &xev->valuators, &delta_x, &delta_y))
          {
            GdkModifierType state;
            GdkScrollDirection direction;

#ifdef XINPUT_2_2
            if (xev->flags & XIPointerEmulated)
              return FALSE;
#endif

            GDK_DISPLAY_DEBUG (display, EVENTS,
                               "smooth scroll: \n\tdevice: %u\n\tsource device: %u\n\twindow %ld\n\tdeltas: %f %f",
                                xev->deviceid, xev->sourceid,
                                xev->event, delta_x, delta_y);

            state = _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group);

            if (delta_x > 0)
              direction = GDK_SCROLL_RIGHT;
            else if (delta_x < 0)
              direction = GDK_SCROLL_LEFT;
            else if (delta_y > 0)
              direction = GDK_SCROLL_DOWN;
            else
              direction = GDK_SCROLL_UP;

            if (gdk_device_get_source (source_device) != GDK_SOURCE_TOUCHPAD &&
                ((delta_x == 0.0 && ABS (delta_y) == 1.0) ||
                 (ABS (delta_x) == 1.0 && delta_y == 0.0)))
              {
                event = gdk_scroll_event_new_discrete (surface,
                                                       device,
                                                       NULL,
                                                       xev->time,
                                                       state,
                                                       direction,
                                                       GDK_SCROLL_RELATIVE_DIRECTION_UNKNOWN);
              }
            else if (gdk_device_get_source (source_device) == GDK_SOURCE_MOUSE)
              {
                event = gdk_scroll_event_new_value120 (surface,
                                                       device,
                                                       NULL,
                                                       xev->time,
                                                       state,
                                                       direction,
                                                       delta_x * 120.0,
                                                       delta_y * 120.0,
                                                       GDK_SCROLL_RELATIVE_DIRECTION_UNKNOWN);
              }
            else
              {
                event = gdk_scroll_event_new (surface,
                                              device,
                                              NULL,
                                              xev->time,
                                              state,
                                              delta_x,
                                              delta_y,
                                              delta_x == 0.0 && delta_y == 0.0,
                                              GDK_SCROLL_UNIT_WHEEL,
                                              GDK_SCROLL_RELATIVE_DIRECTION_UNKNOWN);
              }
            break;
          }

#ifdef XINPUT_2_2
        if (xev->flags & XIPointerEmulated &&
            gdk_device_get_source (source_device) == GDK_SOURCE_TOUCHSCREEN)
          {
            /* Touch drag&drop */
            GdkSeat *seat = gdk_device_get_seat (device);
            device = gdk_x11_seat_xi2_get_logical_touch (GDK_X11_SEAT_XI2 (seat));
          }
#endif

        axes = translate_axes (device,
                               (double) xev->event_x / scale,
                               (double) xev->event_y / scale,
                               surface,
                               &xev->valuators);

        x = (double) xev->event_x / scale;
        y = (double) xev->event_y / scale;

        event = gdk_motion_event_new (surface,
                                      device,
                                      source_device->last_tool,
                                      xev->time,
                                      _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group),
                                      x, y,
                                      axes);

      }
      break;

#ifdef XINPUT_2_2
    case XI_TouchBegin:
    case XI_TouchEnd:
      {
        XIDeviceEvent *xev = (XIDeviceEvent *) ev;
        GdkModifierType state;

        double x, y;
        double *axes;

        GDK_DISPLAY_DEBUG (display, EVENTS,
                           "touch %s:\twindow %ld\n\ttouch id: %u\n\tpointer emulating: %s",
                           ev->evtype == XI_TouchBegin ? "begin" : "end",
                           xev->event,
                           xev->detail,
                           xev->flags & XITouchEmulatingPointer ? "true" : "false");

        device = g_hash_table_lookup (device_manager->id_table,
                                      GUINT_TO_POINTER (xev->deviceid));

        source_device = g_hash_table_lookup (device_manager->id_table,
                                             GUINT_TO_POINTER (xev->sourceid));

        if (G_LIKELY (gdk_device_get_source (source_device) == GDK_SOURCE_TOUCHSCREEN))
          {
            GdkSeat *seat = gdk_device_get_seat (device);
            device = gdk_x11_seat_xi2_get_logical_touch (GDK_X11_SEAT_XI2 (seat));
          }

        state = _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group);
        if (ev->evtype == XI_TouchBegin)
          state |= GDK_BUTTON1_MASK;

        axes = translate_axes (device,
                               (double) xev->event_x / scale,
                               (double) xev->event_y / scale,
                               surface,
                               &xev->valuators);

        x = (double) xev->event_x / scale;
        y = (double) xev->event_y / scale;

        event = gdk_touch_event_new (ev->evtype == XI_TouchBegin
                                       ? GDK_TOUCH_BEGIN
                                       : GDK_TOUCH_END,
                                     GUINT_TO_POINTER (xev->detail),
                                     surface,
                                     device,
                                     xev->time,
                                     state,
                                     x, y,
                                     axes,
                                     xev->flags & XITouchEmulatingPointer);

        if (ev->evtype == XI_TouchBegin)
          set_user_time (event);
      }
      break;

    case XI_TouchUpdate:
      {
        XIDeviceEvent *xev = (XIDeviceEvent *) ev;
        GdkModifierType state;

        double x, y;
        double *axes;

        GDK_DISPLAY_DEBUG (display, EVENTS,
                           "touch update:\twindow %ld\n\ttouch id: %u\n\tpointer emulating: %s",
                           xev->event,
                           xev->detail,
                           xev->flags & XITouchEmulatingPointer ? "true" : "false");

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

        source_device = g_hash_table_lookup (device_manager->id_table,
                                             GUINT_TO_POINTER (xev->sourceid));

        if (G_LIKELY (gdk_device_get_source (source_device) == GDK_SOURCE_TOUCHSCREEN))
          {
            GdkSeat *seat = gdk_device_get_seat (device);
            device = gdk_x11_seat_xi2_get_logical_touch (GDK_X11_SEAT_XI2 (seat));
          }

        state = _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group);
        state |= GDK_BUTTON1_MASK;

        axes = translate_axes (device,
                               (double) xev->event_x / scale,
                               (double) xev->event_y / scale,
                               surface,
                               &xev->valuators);

        x = (double) xev->event_x / scale;
        y = (double) xev->event_y / scale;

        event = gdk_touch_event_new (GDK_TOUCH_UPDATE,
                                     GUINT_TO_POINTER (xev->detail),
                                     surface,
                                     device,
                                     xev->time,
                                     state,
                                     x, y,
                                     axes,
                                     xev->flags & XITouchEmulatingPointer);
      }
      break;
#endif  /* XINPUT_2_2 */

#ifdef XINPUT_2_4
    case XI_GesturePinchBegin:
    case XI_GesturePinchUpdate:
    case XI_GesturePinchEnd:
      {
        XIGesturePinchEvent *xev = (XIGesturePinchEvent *) ev;
        GdkModifierType state;
        GdkTouchpadGesturePhase phase;
        double x, y;

        const char *event_name = "";
        switch (xev->evtype)
          {
          case XI_GesturePinchBegin:
            event_name = "begin";
            break;
          case XI_GesturePinchUpdate:
            event_name = "update";
            break;
          case XI_GesturePinchEnd:
            event_name = "end";
            break;
          default:
            break;
          }

        GDK_DEBUG (EVENTS, "pinch gesture %s:\twindow %ld\n\tfinger_count: %u%s",
                           event_name,
                           xev->event,
                           xev->detail,
                           xev->flags & XIGesturePinchEventCancelled ? "\n\tcancelled" : "");

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

        state = _gdk_x11_device_xi2_translate_state (&xev->mods, NULL, &xev->group);
        phase = _gdk_x11_device_xi2_gesture_type_to_phase (xev->evtype, xev->flags);

        x = (double) xev->event_x / scale;
        y = (double) xev->event_y / scale;

        event = gdk_touchpad_event_new_pinch (surface,
                                              NULL, /* FIXME make up sequences */
                                              device,
                                              xev->time,
                                              state,
                                              phase,
                                              x, y,
                                              xev->detail,
                                              xev->delta_x,
                                              xev->delta_y,
                                              xev->scale,
                                              xev->delta_angle * G_PI / 180);

        if (ev->evtype == XI_GesturePinchBegin)
          set_user_time (event);
      }
      break;

    case XI_GestureSwipeBegin:
    case XI_GestureSwipeUpdate:
    case XI_GestureSwipeEnd:
      {
        XIGestureSwipeEvent *xev = (XIGestureSwipeEvent *) ev;
        GdkModifierType state;
        GdkTouchpadGesturePhase phase;
        double x, y;

        const char *event_name = "";
        switch (xev->evtype)
          {
          case XI_GestureSwipeBegin:
            event_name = "begin";
            break;
          case XI_GestureSwipeUpdate:
            event_name = "update";
            break;
          case XI_GestureSwipeEnd:
            event_name = "end";
            break;
          default:
            break;
          }

        GDK_DEBUG (EVENTS, "swipe gesture %s:\twindow %ld\n\tfinger_count: %u%s",
                           event_name,
                           xev->event,
                           xev->detail,
                           xev->flags & XIGestureSwipeEventCancelled ? "\n\tcancelled" : "");

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

        state = _gdk_x11_device_xi2_translate_state (&xev->mods, NULL, &xev->group);
        phase = _gdk_x11_device_xi2_gesture_type_to_phase (xev->evtype, xev->flags);

        x = (double) xev->event_x / scale;
        y = (double) xev->event_y / scale;

        event = gdk_touchpad_event_new_swipe (surface,
                                              NULL, /* FIXME make up sequences */
                                              device,
                                              xev->time,
                                              state,
                                              phase,
                                              x, y,
                                              xev->detail,
                                              xev->delta_x,
                                              xev->delta_y);

        if (ev->evtype == XI_GestureSwipeBegin)
          set_user_time (event);
      }
      break;
#endif /* XINPUT_2_4 */

    case XI_Enter:
    case XI_Leave:
      {
        XIEnterEvent *xev = (XIEnterEvent *) ev;
        GdkModifierType state;

        GDK_DISPLAY_DEBUG (display, EVENTS,
                           "%s notify:\twindow %ld\n\tsubwindow:%ld\n"
                           "\tdevice: %u\n\tsource device: %u\n"
                           "\tnotify type: %u\n\tcrossing mode: %u",
                           (ev->evtype == XI_Enter) ? "enter" : "leave",
                           xev->event, xev->child,
                           xev->deviceid, xev->sourceid,
                           xev->detail, xev->mode);

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

        source_device = g_hash_table_lookup (device_manager->id_table,
                                             GUINT_TO_POINTER (xev->sourceid));

        state = _gdk_x11_device_xi2_translate_state (&xev->mods, &xev->buttons, &xev->group);

        /* Ignore normal crossing events while there is an implicit grab.
         * We will receive a crossing event with one of the other details if
         * the implicit grab were finished (eg. releasing the button outside
         * the window triggers a XINotifyUngrab leave).
         */
        if (xev->mode == XINotifyNormal &&
            (state & (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK |
                      GDK_BUTTON4_MASK | GDK_BUTTON5_MASK)))
          {
            surface->has_pointer = ev->evtype == XI_Enter;
            break;
          }

        if (ev->evtype == XI_Enter &&
            xev->detail != XINotifyInferior && xev->mode != XINotifyPassiveUngrab &&
            GDK_IS_TOPLEVEL (surface))
          {
            GList *l;

            for (l = device_manager->devices; l; l = l->next)
              _gdk_device_xi2_reset_scroll_valuators (GDK_X11_DEVICE_XI2 (l->data));
          }

        event = gdk_crossing_event_new (ev->evtype == XI_Enter
                                          ? GDK_ENTER_NOTIFY
                                          : GDK_LEAVE_NOTIFY,
                                        surface,
                                        device,
                                        xev->time,
                                        state,
                                        (double) xev->event_x / scale,
                                        (double) xev->event_y / scale,
                                        translate_crossing_mode (xev->mode),
                                        translate_notify_type (xev->detail));
      }
      break;
    case XI_FocusIn:
    case XI_FocusOut:
      {
        if (surface)
          {
            XIEnterEvent *xev = (XIEnterEvent *) ev;

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

            source_device = g_hash_table_lookup (device_manager->id_table,
                                                 GUINT_TO_POINTER (xev->sourceid));

            _gdk_device_manager_xi2_handle_focus (surface,
                                                  xev->event,
                                                  device,
                                                  source_device,
                                                  (ev->evtype == XI_FocusIn) ? TRUE : FALSE,
                                                  xev->detail,
                                                  xev->mode);
          }
      }
      break;
    default:
      break;
    }

  return event;
}

static GdkEventMask
gdk_x11_device_manager_xi2_get_handled_events (GdkEventTranslator *translator)
{
  return (GDK_KEY_PRESS_MASK |
          GDK_KEY_RELEASE_MASK |
          GDK_BUTTON_PRESS_MASK |
          GDK_BUTTON_RELEASE_MASK |
          GDK_SCROLL_MASK |
          GDK_ENTER_NOTIFY_MASK |
          GDK_LEAVE_NOTIFY_MASK |
          GDK_POINTER_MOTION_MASK |
          GDK_BUTTON1_MOTION_MASK |
          GDK_BUTTON2_MOTION_MASK |
          GDK_BUTTON3_MOTION_MASK |
          GDK_BUTTON_MOTION_MASK |
          GDK_FOCUS_CHANGE_MASK |
          GDK_TOUCH_MASK |
          GDK_TOUCHPAD_GESTURE_MASK);
}

static void
gdk_x11_device_manager_xi2_select_surface_events (GdkEventTranslator *translator,
                                                 Window              window,
                                                 GdkEventMask        evmask)
{
  XIEventMask event_mask;

  event_mask.deviceid = XIAllMasterDevices;
  event_mask.mask = _gdk_x11_device_xi2_translate_event_mask (GDK_X11_DEVICE_MANAGER_XI2 (translator),
                                                              evmask,
                                                              &event_mask.mask_len);

  _gdk_x11_device_manager_xi2_select_events (GDK_X11_DEVICE_MANAGER_XI2 (translator), window, &event_mask);
  g_free (event_mask.mask);
}

static GdkSurface *
gdk_x11_device_manager_xi2_get_surface (GdkEventTranslator *translator,
                                        const XEvent       *xevent)
{
  GdkX11DeviceManagerXI2 *device_manager;
  XIEvent *ev;
  GdkSurface *surface = NULL;

  device_manager = (GdkX11DeviceManagerXI2 *) translator;

  if (xevent->type != GenericEvent ||
      xevent->xcookie.extension != device_manager->opcode)
    return NULL;

  ev = (XIEvent *) xevent->xcookie.data;
  if (!ev)
    return NULL;

  get_event_surface (translator, ev, &surface);
  return surface;
}

GdkDevice *
_gdk_x11_device_manager_xi2_lookup (GdkX11DeviceManagerXI2 *device_manager_xi2,
                                    int                     device_id)
{
  return g_hash_table_lookup (device_manager_xi2->id_table,
                              GINT_TO_POINTER (device_id));
}