/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/*
 * Copyright 2014 Red Hat, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Carlos Garnacho <carlosg@gnome.org>
 */

/**
 * SECTION:input-settings
 * @title: MetaInputSettings
 * @short_description: Mutter input device configuration
 */

#include "config.h"

#include <glib/gi18n-lib.h>
#include <string.h>

#include "backends/meta-backend-private.h"
#include "backends/meta-input-device-private.h"
#include "backends/meta-input-settings-private.h"
#include "backends/meta-input-mapper-private.h"
#include "backends/meta-logical-monitor.h"
#include "backends/meta-monitor.h"
#include "core/display-private.h"
#include "meta/util.h"

enum
{
  PROP_0,

  PROP_BACKEND,

  N_PROPS
};

static GParamSpec *props[N_PROPS] = { 0 };

static GQuark quark_tool_settings = 0;

typedef struct _MetaInputSettingsPrivate MetaInputSettingsPrivate;
typedef struct _DeviceMappingInfo DeviceMappingInfo;
typedef struct _CurrentToolInfo CurrentToolInfo;

struct _CurrentToolInfo
{
  MetaInputSettings *input_settings;
  ClutterInputDevice *device;
  ClutterInputDeviceTool *tool;
  GSettings *settings;
  gulong changed_id;
};

struct _DeviceMappingInfo
{
  MetaInputSettings *input_settings;
  ClutterInputDevice *device;
  GSettings *settings;
  gulong changed_id;
  guint *group_modes;
  double aspect_ratio;
};

struct _MetaInputSettingsPrivate
{
  MetaBackend *backend;

  ClutterSeat *seat;
  gulong monitors_changed_id;

  GSettings *mouse_settings;
  GSettings *touchpad_settings;
  GSettings *trackball_settings;
  GSettings *keyboard_settings;
  GSettings *keyboard_a11y_settings;

  GList *devices;
  GHashTable *mappable_devices;

  GHashTable *current_tools;

  GHashTable *two_finger_devices;

  MetaKbdA11ySettings kbd_a11y_settings;
};

typedef gboolean (* ConfigBoolMappingFunc) (MetaInputSettings  *input_settings,
                                            ClutterInputDevice *device,
                                            gboolean            value);

typedef void (*ConfigBoolFunc)   (MetaInputSettings  *input_settings,
                                  ClutterInputDevice *device,
                                  gboolean            setting);
typedef void (*ConfigDoubleFunc) (MetaInputSettings  *input_settings,
                                  ClutterInputDevice *device,
                                  gdouble             value);
typedef void (*ConfigUintFunc)   (MetaInputSettings  *input_settings,
                                  ClutterInputDevice *device,
                                  guint               value);

G_DEFINE_TYPE_WITH_PRIVATE (MetaInputSettings, meta_input_settings, G_TYPE_OBJECT)

enum
{
  KBD_A11Y_CHANGED,
  N_SIGNALS
};

static guint signals[N_SIGNALS] = { 0 };

static gboolean
device_matches_capabilities (ClutterInputDevice       *device,
                             ClutterInputCapabilities  require_capabilities,
                             ClutterInputCapabilities  reject_capabilities)
{
  ClutterInputCapabilities capabilities;

  capabilities = clutter_input_device_get_capabilities (device);

  if ((capabilities & require_capabilities) != require_capabilities)
    return FALSE;
  if ((capabilities & reject_capabilities) != 0)
    return FALSE;

  return TRUE;
}

static GSList *
meta_input_settings_get_devices (MetaInputSettings        *settings,
                                 ClutterInputCapabilities  require_capabilities,
                                 ClutterInputCapabilities  reject_capabilities)
{
  MetaInputSettingsPrivate *priv;
  GList *l;
  GSList *list = NULL;

  priv = meta_input_settings_get_instance_private (settings);

  for (l = priv->devices; l; l = l->next)
    {
      ClutterInputDevice *device = l->data;

      if (clutter_input_device_get_device_mode (device) == CLUTTER_INPUT_MODE_LOGICAL)
        continue;

      if (!device_matches_capabilities (device,
                                        require_capabilities,
                                        reject_capabilities))
        continue;

      list = g_slist_prepend (list, device);
    }

  return list;
}

static void
meta_input_settings_dispose (GObject *object)
{
  MetaInputSettings *settings = META_INPUT_SETTINGS (object);
  MetaInputSettingsPrivate *priv = meta_input_settings_get_instance_private (settings);

  g_clear_object (&priv->mouse_settings);
  g_clear_object (&priv->touchpad_settings);
  g_clear_object (&priv->trackball_settings);
  g_clear_object (&priv->keyboard_settings);
  g_clear_object (&priv->keyboard_a11y_settings);
  g_clear_pointer (&priv->mappable_devices, g_hash_table_unref);
  g_clear_pointer (&priv->current_tools, g_hash_table_unref);

  g_clear_pointer (&priv->two_finger_devices, g_hash_table_destroy);

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

static void
settings_device_set_bool_setting (MetaInputSettings  *input_settings,
                                  ClutterInputDevice *device,
                                  ConfigBoolFunc      func,
                                  gboolean            enabled)
{
  func (input_settings, device, enabled);
}

static void
settings_set_bool_setting (MetaInputSettings        *input_settings,
                           ClutterInputCapabilities  capabilities,
                           ClutterInputCapabilities  unset_capabilities,
                           ConfigBoolMappingFunc     mapping_func,
                           ConfigBoolFunc            func,
                           gboolean                  enabled)
{
  GSList *devices, *l;

  devices = meta_input_settings_get_devices (input_settings,
                                             capabilities,
                                             unset_capabilities);

  for (l = devices; l; l = l->next)
    {
      gboolean value = enabled;

      if (mapping_func)
        value = mapping_func (input_settings, l->data, value);
      settings_device_set_bool_setting (input_settings, l->data, func, value);
    }

  g_slist_free (devices);
}

static void
settings_device_set_double_setting (MetaInputSettings  *input_settings,
                                    ClutterInputDevice *device,
                                    ConfigDoubleFunc    func,
                                    gdouble             value)
{
  func (input_settings, device, value);
}

static void
settings_set_double_setting (MetaInputSettings        *input_settings,
                             ClutterInputCapabilities  capabilities,
                             ClutterInputCapabilities  unset_capabilities,
                             ConfigDoubleFunc          func,
                             gdouble                   value)
{
  GSList *devices, *d;

  devices = meta_input_settings_get_devices (input_settings,
                                             capabilities,
                                             unset_capabilities);

  for (d = devices; d; d = d->next)
    settings_device_set_double_setting (input_settings, d->data, func, value);

  g_slist_free (devices);
}

static void
settings_device_set_uint_setting (MetaInputSettings  *input_settings,
                                  ClutterInputDevice *device,
                                  ConfigUintFunc      func,
                                  guint               value)
{
  (func) (input_settings, device, value);
}

static void
settings_set_uint_setting (MetaInputSettings        *input_settings,
                           ClutterInputCapabilities  capabilities,
                           ClutterInputCapabilities  unset_capabilities,
                           ConfigUintFunc            func,
                           guint                     value)
{
  GSList *devices, *d;

  devices = meta_input_settings_get_devices (input_settings,
                                             capabilities,
                                             unset_capabilities);

  for (d = devices; d; d = d->next)
    settings_device_set_uint_setting (input_settings, d->data, func, value);

  g_slist_free (devices);
}

static void
update_touchpad_left_handed (MetaInputSettings  *input_settings,
                             ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  GDesktopTouchpadHandedness handedness;
  MetaInputSettingsPrivate *priv;
  gboolean enabled = FALSE;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  handedness = g_settings_get_enum (priv->touchpad_settings, "left-handed");

  switch (handedness)
    {
    case G_DESKTOP_TOUCHPAD_HANDEDNESS_RIGHT:
      enabled = FALSE;
      break;
    case G_DESKTOP_TOUCHPAD_HANDEDNESS_LEFT:
      enabled = TRUE;
      break;
    case G_DESKTOP_TOUCHPAD_HANDEDNESS_MOUSE:
      enabled = g_settings_get_boolean (priv->mouse_settings, "left-handed");
      break;
    default:
      g_assert_not_reached ();
    }

  if (device)
    {
      settings_device_set_bool_setting (input_settings, device,
                                        input_settings_class->set_left_handed,
                                        enabled);
    }
  else
    {
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 NULL,
                                 input_settings_class->set_left_handed,
                                 enabled);
    }
}

static void
update_mouse_left_handed (MetaInputSettings  *input_settings,
                          ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  MetaInputSettingsPrivate *priv;
  gboolean enabled;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_POINTER,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  enabled = g_settings_get_boolean (priv->mouse_settings, "left-handed");

  if (device)
    {
      settings_device_set_bool_setting (input_settings, device,
                                        input_settings_class->set_left_handed,
                                        enabled);
    }
  else
    {
      GDesktopTouchpadHandedness touchpad_handedness;

      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_POINTER,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 NULL,
                                 input_settings_class->set_left_handed,
                                 enabled);

      touchpad_handedness = g_settings_get_enum (priv->touchpad_settings,
                                                 "left-handed");

      /* Also update touchpads if they're following mouse settings */
      if (touchpad_handedness == G_DESKTOP_TOUCHPAD_HANDEDNESS_MOUSE)
        update_touchpad_left_handed (input_settings, NULL);
    }
}

static void
do_update_pointer_accel_profile (MetaInputSettings          *input_settings,
                                 GSettings                  *settings,
                                 ClutterInputDevice         *device,
                                 GDesktopPointerAccelProfile profile)
{
  MetaInputSettingsPrivate *priv =
    meta_input_settings_get_instance_private (input_settings);
  MetaInputSettingsClass *input_settings_class =
    META_INPUT_SETTINGS_GET_CLASS (input_settings);

  if (settings == priv->mouse_settings)
    input_settings_class->set_mouse_accel_profile (input_settings,
                                                   device,
                                                   profile);
  else if (settings == priv->touchpad_settings)
    input_settings_class->set_touchpad_accel_profile (input_settings,
                                                      device,
                                                      profile);
  else if (settings == priv->trackball_settings)
    input_settings_class->set_trackball_accel_profile (input_settings,
                                                       device,
                                                       profile);
}

static void
update_pointer_accel_profile (MetaInputSettings  *input_settings,
                              GSettings          *settings,
                              ClutterInputDevice *device)
{
  GDesktopPointerAccelProfile profile;

  profile = g_settings_get_enum (settings, "accel-profile");

  if (device)
    {
      do_update_pointer_accel_profile (input_settings, settings,
                                       device, profile);
    }
  else
    {
      MetaInputSettingsPrivate *priv =
        meta_input_settings_get_instance_private (input_settings);
      GList *l;

      for (l = priv->devices; l; l = l->next)
        {
          device = l->data;

          if (clutter_input_device_get_device_mode (device) ==
              CLUTTER_INPUT_MODE_LOGICAL)
            continue;

          do_update_pointer_accel_profile (input_settings, settings,
                                           device, profile);
        }
    }
}

static GSettings *
get_settings_for_capabilities (MetaInputSettings        *input_settings,
                               ClutterInputCapabilities  capabilities)
{
  MetaInputSettingsPrivate *priv;

  priv = meta_input_settings_get_instance_private (input_settings);

  if (capabilities & CLUTTER_INPUT_CAPABILITY_TOUCHPAD)
    return priv->touchpad_settings;
  if (capabilities & CLUTTER_INPUT_CAPABILITY_POINTER)
    return priv->mouse_settings;

  return NULL;
}

static void
update_middle_click_emulation (MetaInputSettings  *input_settings,
                               GSettings          *settings,
                               ClutterInputDevice *device)
{
  ConfigBoolFunc func;
  const gchar *key = "middle-click-emulation";
  MetaInputSettingsPrivate *priv = meta_input_settings_get_instance_private (input_settings);

  if (!settings)
    return;

  if (settings == priv->mouse_settings)
    func = META_INPUT_SETTINGS_GET_CLASS (input_settings)->set_mouse_middle_click_emulation;
  else if (settings == priv->touchpad_settings)
    func = META_INPUT_SETTINGS_GET_CLASS (input_settings)->set_touchpad_middle_click_emulation;
  else if (settings == priv->trackball_settings)
    func = META_INPUT_SETTINGS_GET_CLASS (input_settings)->set_trackball_middle_click_emulation;
  else
    return;

  if (device)
    {
      settings_device_set_bool_setting (input_settings, device, func,
                                        g_settings_get_boolean (settings, key));
    }
  else
    {
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_POINTER,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 NULL, func,
                                 g_settings_get_boolean (settings, key));
    }
}

static void
update_device_speed (MetaInputSettings      *input_settings,
                     ClutterInputDevice     *device)
{
  GSettings *settings;
  ConfigDoubleFunc func;
  const gchar *key = "speed";

  func = META_INPUT_SETTINGS_GET_CLASS (input_settings)->set_speed;

  if (device)
    {
      settings = get_settings_for_capabilities (input_settings,
                                                clutter_input_device_get_capabilities (device));
      if (!settings)
        return;

      settings_device_set_double_setting (input_settings, device, func,
                                          g_settings_get_double (settings, key));
    }
  else
    {
      settings = get_settings_for_capabilities (input_settings,
                                                CLUTTER_INPUT_CAPABILITY_POINTER);
      settings_set_double_setting (input_settings,
                                   CLUTTER_INPUT_CAPABILITY_POINTER,
                                   CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                   func,
                                   g_settings_get_double (settings, key));

      settings = get_settings_for_capabilities (input_settings,
                                                CLUTTER_INPUT_CAPABILITY_TOUCHPAD);
      settings_set_double_setting (input_settings,
                                   CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                   CLUTTER_INPUT_CAPABILITY_NONE,
                                   func,
                                   g_settings_get_double (settings, key));
    }
}

static void
update_device_natural_scroll (MetaInputSettings      *input_settings,
                              ClutterInputDevice     *device)
{
  GSettings *settings;
  ConfigBoolFunc func;
  const gchar *key = "natural-scroll";

  func = META_INPUT_SETTINGS_GET_CLASS (input_settings)->set_invert_scroll;

  if (device)
    {
      settings = get_settings_for_capabilities (input_settings,
                                                clutter_input_device_get_capabilities (device));
      if (!settings)
        return;

      settings_device_set_bool_setting (input_settings, device, func,
                                        g_settings_get_boolean (settings, key));
    }
  else
    {
      settings = get_settings_for_capabilities (input_settings,
                                                CLUTTER_INPUT_CAPABILITY_POINTER);
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_POINTER,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 NULL, func,
                                 g_settings_get_boolean (settings, key));

      settings = get_settings_for_capabilities (input_settings,
                                                CLUTTER_INPUT_CAPABILITY_TOUCHPAD);
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 NULL, func,
                                 g_settings_get_boolean (settings, key));
    }
}

static void
update_touchpad_disable_while_typing (MetaInputSettings  *input_settings,
                                      ClutterInputDevice *device)
{
  GSettings *settings;
  MetaInputSettingsClass *input_settings_class;
  MetaInputSettingsPrivate *priv;
  gboolean enabled;
  const gchar *key = "disable-while-typing";

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  enabled = g_settings_get_boolean (priv->touchpad_settings, key);

  if (device)
   {
      settings = get_settings_for_capabilities (input_settings,
                                                clutter_input_device_get_capabilities (device));

      if (!settings)
        return;

      settings_device_set_bool_setting (input_settings, device,
                                        input_settings_class->set_disable_while_typing,
                                        enabled);
    }
  else
    {
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 NULL,
                                 input_settings_class->set_disable_while_typing,
                                 enabled);
    }
}

static gboolean
device_is_tablet_touchpad (MetaInputSettings  *input_settings,
                           ClutterInputDevice *device)
{
#ifdef HAVE_LIBWACOM
  WacomIntegrationFlags flags = 0;
  WacomDevice *wacom_device;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return FALSE;

  wacom_device = meta_input_device_get_wacom_device (META_INPUT_DEVICE (device));

  if (wacom_device)
    {
      flags = libwacom_get_integration_flags (wacom_device);

      if ((flags & (WACOM_DEVICE_INTEGRATED_SYSTEM |
                    WACOM_DEVICE_INTEGRATED_DISPLAY)) == 0)
        return TRUE;
    }
#endif

  return FALSE;
}

static gboolean
force_enable_on_tablet (MetaInputSettings  *input_settings,
                        ClutterInputDevice *device,
                        gboolean            value)
{
  return device_is_tablet_touchpad (input_settings, device) || value;
}

static void
update_touchpad_tap_enabled (MetaInputSettings  *input_settings,
                             ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  MetaInputSettingsPrivate *priv;
  gboolean enabled;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  enabled = g_settings_get_boolean (priv->touchpad_settings, "tap-to-click");

  if (device)
    {
      enabled = force_enable_on_tablet (input_settings, device, enabled);
      settings_device_set_bool_setting (input_settings, device,
                                        input_settings_class->set_tap_enabled,
                                        enabled);
    }
  else
    {
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 force_enable_on_tablet,
                                 input_settings_class->set_tap_enabled,
                                 enabled);
    }
}

static void
update_touchpad_tap_button_map (MetaInputSettings  *input_settings,
                                ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  GDesktopTouchpadTapButtonMap method;
  MetaInputSettingsPrivate *priv;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  method = g_settings_get_enum (priv->touchpad_settings, "tap-button-map");

  if (device)
    {
      settings_device_set_uint_setting (input_settings, device,
                                        input_settings_class->set_tap_button_map,
                                        method);
    }
  else
    {
      settings_set_uint_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 (ConfigUintFunc) input_settings_class->set_tap_button_map,
                                 method);
    }
}

static void
update_touchpad_tap_and_drag_enabled (MetaInputSettings  *input_settings,
                                      ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  MetaInputSettingsPrivate *priv;
  gboolean enabled;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  enabled = g_settings_get_boolean (priv->touchpad_settings, "tap-and-drag");

  if (device)
    {
      enabled = force_enable_on_tablet (input_settings, device, enabled);
      settings_device_set_bool_setting (input_settings, device,
                                        input_settings_class->set_tap_and_drag_enabled,
                                        enabled);
    }
  else
    {
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 force_enable_on_tablet,
                                 input_settings_class->set_tap_and_drag_enabled,
                                 enabled);
    }
}

static void
update_touchpad_tap_and_drag_lock_enabled (MetaInputSettings  *input_settings,
                                           ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  MetaInputSettingsPrivate *priv;
  gboolean enabled;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  enabled = g_settings_get_boolean (priv->touchpad_settings, "tap-and-drag-lock");

  if (device)
    {
      settings_device_set_bool_setting (input_settings, device,
                                        input_settings_class->set_tap_and_drag_lock_enabled,
                                        enabled);
    }
  else
    {
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 NULL,
                                 input_settings_class->set_tap_and_drag_lock_enabled,
                                 enabled);
    }
}

static void
update_touchpad_edge_scroll (MetaInputSettings *input_settings,
                             ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  gboolean edge_scroll_enabled;
  gboolean two_finger_scroll_enabled;
  gboolean two_finger_scroll_available;
  MetaInputSettingsPrivate *priv;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  edge_scroll_enabled = g_settings_get_boolean (priv->touchpad_settings, "edge-scrolling-enabled");
  two_finger_scroll_enabled = g_settings_get_boolean (priv->touchpad_settings, "two-finger-scrolling-enabled");
  two_finger_scroll_available = g_hash_table_size (priv->two_finger_devices) > 0;

  /* If both are enabled we prefer two finger. */
  if (edge_scroll_enabled && two_finger_scroll_enabled && two_finger_scroll_available)
    edge_scroll_enabled = FALSE;

  if (device)
    {
      settings_device_set_bool_setting (input_settings, device,
                                        input_settings_class->set_edge_scroll,
                                        edge_scroll_enabled);
    }
  else
    {
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 NULL,
                                 (ConfigBoolFunc) input_settings_class->set_edge_scroll,
                                 edge_scroll_enabled);
    }
}

static void
update_touchpad_two_finger_scroll (MetaInputSettings *input_settings,
                                   ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  gboolean two_finger_scroll_enabled;
  MetaInputSettingsPrivate *priv;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  two_finger_scroll_enabled = g_settings_get_boolean (priv->touchpad_settings, "two-finger-scrolling-enabled");

  /* Disable edge since they can't both be set. */
  if (two_finger_scroll_enabled)
    update_touchpad_edge_scroll (input_settings, device);

  if (device)
    {
      settings_device_set_bool_setting (input_settings, device,
                                        input_settings_class->set_two_finger_scroll,
                                        two_finger_scroll_enabled);
    }
  else
    {
      settings_set_bool_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 NULL,
                                 (ConfigBoolFunc) input_settings_class->set_two_finger_scroll,
                                 two_finger_scroll_enabled);
    }

  /* Edge might have been disabled because two finger was on. */
  if (!two_finger_scroll_enabled)
    update_touchpad_edge_scroll (input_settings, device);
}

static void
update_touchpad_click_method (MetaInputSettings *input_settings,
                              ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  GDesktopTouchpadClickMethod method;
  MetaInputSettingsPrivate *priv;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  method = g_settings_get_enum (priv->touchpad_settings, "click-method");

  if (device)
    {
      settings_device_set_uint_setting (input_settings, device,
                                        input_settings_class->set_click_method,
                                        method);
    }
  else
    {
      settings_set_uint_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 (ConfigUintFunc) input_settings_class->set_click_method,
                                 method);
    }
}

static void
update_touchpad_send_events (MetaInputSettings  *input_settings,
                             ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  MetaInputSettingsPrivate *priv;
  GDesktopDeviceSendEvents mode;

  if (device &&
      !device_matches_capabilities (device,
                                    CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                    CLUTTER_INPUT_CAPABILITY_NONE))
    return;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  mode = g_settings_get_enum (priv->touchpad_settings, "send-events");

  if (device)
    {
      settings_device_set_uint_setting (input_settings, device,
                                        input_settings_class->set_send_events,
                                        mode);
    }
  else
    {
      settings_set_uint_setting (input_settings,
                                 CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                 CLUTTER_INPUT_CAPABILITY_NONE,
                                 input_settings_class->set_send_events,
                                 mode);
    }
}

static void
update_trackball_scroll_button (MetaInputSettings  *input_settings,
                                ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  MetaInputSettingsPrivate *priv;
  guint button;
  gboolean button_lock;
  ClutterInputCapabilities caps;

  priv = meta_input_settings_get_instance_private (input_settings);
  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);

  if (device)
    {
      caps = clutter_input_device_get_capabilities (device);

      if ((caps & CLUTTER_INPUT_CAPABILITY_TRACKBALL) == 0)
        return;
    }

  /* This key is 'i' in the schema but it also specifies a minimum
   * range of 0 so the cast here is safe. */
  button = (guint) g_settings_get_int (priv->trackball_settings, "scroll-wheel-emulation-button");
  button_lock = g_settings_get_boolean (priv->trackball_settings, "scroll-wheel-emulation-button-lock");

  if (device)
    {
      input_settings_class->set_scroll_button (input_settings, device, button, button_lock);
    }
  else if (!device)
    {
      GList *l;

      for (l = priv->devices; l; l = l->next)
        {
          device = l->data;
          caps = clutter_input_device_get_capabilities (device);

          if ((caps & CLUTTER_INPUT_CAPABILITY_TRACKBALL) != 0)
            input_settings_class->set_scroll_button (input_settings, device, button, button_lock);
        }
    }
}

static void
update_keyboard_repeat (MetaInputSettings *input_settings)
{
  MetaInputSettingsClass *input_settings_class;
  MetaInputSettingsPrivate *priv;
  guint delay, interval;
  gboolean repeat;

  priv = meta_input_settings_get_instance_private (input_settings);
  repeat = g_settings_get_boolean (priv->keyboard_settings, "repeat");
  delay = g_settings_get_uint (priv->keyboard_settings, "delay");
  interval = g_settings_get_uint (priv->keyboard_settings, "repeat-interval");

  delay = MAX (1, delay);
  interval = MAX (1, interval);

  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  input_settings_class->set_keyboard_repeat (input_settings,
                                             repeat, delay, interval);
}

static void
update_tablet_keep_aspect (MetaInputSettings  *input_settings,
                           GSettings          *settings,
                           ClutterInputDevice *device)
{
  MetaInputSettingsPrivate *priv;
  MetaInputSettingsClass *input_settings_class;
  DeviceMappingInfo *info;
  gboolean keep_aspect;
  double aspect_ratio;

  if ((clutter_input_device_get_capabilities (device) &
       CLUTTER_INPUT_CAPABILITY_TABLET_TOOL) == 0)
    return;

  priv = meta_input_settings_get_instance_private (input_settings);

  info = g_hash_table_lookup (priv->mappable_devices, device);
  if (!info)
    return;

  keep_aspect = g_settings_get_boolean (settings, "keep-aspect");

  if (keep_aspect)
    aspect_ratio = info->aspect_ratio;
  else
    aspect_ratio = 0;

  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  input_settings_class->set_tablet_aspect_ratio (input_settings, device, aspect_ratio);
}

static void
update_tablet_mapping (MetaInputSettings  *input_settings,
                       GSettings          *settings,
                       ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  GDesktopTabletMapping mapping;

  if ((clutter_input_device_get_capabilities (device) &
       CLUTTER_INPUT_CAPABILITY_TABLET_TOOL) == 0)
    return;

  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  mapping = g_settings_get_enum (settings, "mapping");

  settings_device_set_uint_setting (input_settings, device,
                                    input_settings_class->set_tablet_mapping,
                                    mapping);
}

static void
update_tablet_area (MetaInputSettings  *input_settings,
                    GSettings          *settings,
                    ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  GVariant *variant;
  const gdouble *area;
  gsize n_elems;

  if ((clutter_input_device_get_capabilities (device) &
       CLUTTER_INPUT_CAPABILITY_TABLET_TOOL) == 0)
    return;

#ifdef HAVE_LIBWACOM
  {
    WacomDevice *wacom_device;

    wacom_device = meta_input_device_get_wacom_device (META_INPUT_DEVICE (device));

    /* Tablet area only makes sense on system/display integrated tablets */
    if (wacom_device &&
        (libwacom_get_integration_flags (wacom_device) &
         (WACOM_DEVICE_INTEGRATED_SYSTEM | WACOM_DEVICE_INTEGRATED_DISPLAY)) == 0)
      return;
  }
#endif

  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  variant = g_settings_get_value (settings, "area");

  area = g_variant_get_fixed_array (variant, &n_elems, sizeof (gdouble));
  if (n_elems == 4)
    {
      input_settings_class->set_tablet_area (input_settings, device,
                                             area[0], area[1],
                                             area[2], area[3]);
    }

  g_variant_unref (variant);
}

static void
update_tablet_left_handed (MetaInputSettings  *input_settings,
                           GSettings          *settings,
                           ClutterInputDevice *device)
{
  MetaInputSettingsClass *input_settings_class;
  gboolean enabled;

  if ((clutter_input_device_get_capabilities (device) &
       (CLUTTER_INPUT_CAPABILITY_TABLET_TOOL |
        CLUTTER_INPUT_CAPABILITY_TABLET_PAD)) == 0)
    return;

#ifdef HAVE_LIBWACOM
  {
    WacomDevice *wacom_device;

    wacom_device = meta_input_device_get_wacom_device (META_INPUT_DEVICE (device));

    /* Left handed mode only makes sense on external tablets */
    if (wacom_device &&
        (libwacom_get_integration_flags (wacom_device) != WACOM_DEVICE_INTEGRATED_NONE))
      return;
  }
#endif

  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  enabled = g_settings_get_boolean (settings, "left-handed");

  settings_device_set_bool_setting (input_settings, device,
                                    input_settings_class->set_left_handed,
                                    enabled);
}

static void
meta_input_settings_changed_cb (GSettings  *settings,
                                const char *key,
                                gpointer    user_data)
{
  MetaInputSettings *input_settings = META_INPUT_SETTINGS (user_data);
  MetaInputSettingsPrivate *priv = meta_input_settings_get_instance_private (input_settings);

  if (settings == priv->mouse_settings)
    {
      if (strcmp (key, "left-handed") == 0)
        update_mouse_left_handed (input_settings, NULL);
      else if (strcmp (key, "speed") == 0)
        update_device_speed (input_settings, NULL);
      else if (strcmp (key, "natural-scroll") == 0)
        update_device_natural_scroll (input_settings, NULL);
      else if (strcmp (key, "accel-profile") == 0)
        update_pointer_accel_profile (input_settings, settings, NULL);
      else if (strcmp (key, "middle-click-emulation") == 0)
        update_middle_click_emulation (input_settings, settings, NULL);
    }
  else if (settings == priv->touchpad_settings)
    {
      if (strcmp (key, "left-handed") == 0)
        update_touchpad_left_handed (input_settings, NULL);
      else if (strcmp (key, "speed") == 0)
        update_device_speed (input_settings, NULL);
      else if (strcmp (key, "natural-scroll") == 0)
        update_device_natural_scroll (input_settings, NULL);
      else if (strcmp (key, "accel-profile") == 0)
        update_pointer_accel_profile (input_settings, settings, NULL);
      else if (strcmp (key, "tap-to-click") == 0)
        update_touchpad_tap_enabled (input_settings, NULL);
      else if (strcmp (key, "tap-button-map") == 0)
        update_touchpad_tap_button_map (input_settings, NULL);
      else if (strcmp (key, "tap-and-drag") == 0)
        update_touchpad_tap_and_drag_enabled (input_settings, NULL);
      else if (strcmp (key, "tap-and-drag-lock") == 0)
        update_touchpad_tap_and_drag_lock_enabled (input_settings, NULL);
      else if (strcmp(key, "disable-while-typing") == 0)
        update_touchpad_disable_while_typing (input_settings, NULL);
      else if (strcmp (key, "send-events") == 0)
        update_touchpad_send_events (input_settings, NULL);
      else if (strcmp (key, "edge-scrolling-enabled") == 0)
        update_touchpad_edge_scroll (input_settings, NULL);
      else if (strcmp (key, "two-finger-scrolling-enabled") == 0)
        update_touchpad_two_finger_scroll (input_settings, NULL);
      else if (strcmp (key, "click-method") == 0)
        update_touchpad_click_method (input_settings, NULL);
      else if (strcmp (key, "middle-click-emulation") == 0)
        update_middle_click_emulation (input_settings, settings, NULL);
    }
  else if (settings == priv->trackball_settings)
    {
      if (strcmp (key, "scroll-wheel-emulation-button") == 0 ||
          strcmp (key, "scroll-wheel-emulation-button-lock") == 0)
        update_trackball_scroll_button (input_settings, NULL);
      else if (strcmp (key, "accel-profile") == 0)
        update_pointer_accel_profile (input_settings, settings, NULL);
      else if (strcmp (key, "middle-click-emulation") == 0)
        update_middle_click_emulation (input_settings, settings, NULL);
    }
  else if (settings == priv->keyboard_settings)
    {
      if (strcmp (key, "repeat") == 0 ||
          strcmp (key, "repeat-interval") == 0 ||
          strcmp (key, "delay") == 0)
        update_keyboard_repeat (input_settings);
    }
}

static void
mapped_device_changed_cb (GSettings         *settings,
                          const gchar       *key,
                          DeviceMappingInfo *info)
{
  if (strcmp (key, "mapping") == 0)
    update_tablet_mapping (info->input_settings, settings, info->device);
  else if (strcmp (key, "area") == 0)
    update_tablet_area (info->input_settings, settings, info->device);
  else if (strcmp (key, "keep-aspect") == 0)
    update_tablet_keep_aspect (info->input_settings, settings, info->device);
  else if (strcmp (key, "left-handed") == 0)
    update_tablet_left_handed (info->input_settings, settings, info->device);
}

static void
apply_mappable_device_settings (MetaInputSettings *input_settings,
                                DeviceMappingInfo *info)
{
  ClutterInputCapabilities capabilities;

  capabilities = clutter_input_device_get_capabilities (info->device);

  if (capabilities &
      (CLUTTER_INPUT_CAPABILITY_TABLET_TOOL |
       CLUTTER_INPUT_CAPABILITY_TABLET_PAD))
    {
      update_tablet_mapping (input_settings, info->settings, info->device);
      update_tablet_area (input_settings, info->settings, info->device);
      update_tablet_keep_aspect (input_settings, info->settings, info->device);
      update_tablet_left_handed (input_settings, info->settings, info->device);
    }
}

struct _keyboard_a11y_settings_flags_pair {
  const char *name;
  MetaKeyboardA11yFlags flag;
} keyboard_a11y_settings_flags_pair[] = {
  { "enable",                    META_A11Y_KEYBOARD_ENABLED },
  { "timeout-enable",            META_A11Y_TIMEOUT_ENABLED },
  { "mousekeys-enable",          META_A11Y_MOUSE_KEYS_ENABLED },
  { "slowkeys-enable",           META_A11Y_SLOW_KEYS_ENABLED },
  { "slowkeys-beep-press",       META_A11Y_SLOW_KEYS_BEEP_PRESS },
  { "slowkeys-beep-accept",      META_A11Y_SLOW_KEYS_BEEP_ACCEPT },
  { "slowkeys-beep-reject",      META_A11Y_SLOW_KEYS_BEEP_REJECT },
  { "bouncekeys-enable",         META_A11Y_BOUNCE_KEYS_ENABLED },
  { "bouncekeys-beep-reject",    META_A11Y_BOUNCE_KEYS_BEEP_REJECT },
  { "togglekeys-enable",         META_A11Y_TOGGLE_KEYS_ENABLED },
  { "stickykeys-enable",         META_A11Y_STICKY_KEYS_ENABLED },
  { "stickykeys-modifier-beep",  META_A11Y_STICKY_KEYS_BEEP },
  { "stickykeys-two-key-off",    META_A11Y_STICKY_KEYS_TWO_KEY_OFF },
  { "feature-state-change-beep", META_A11Y_FEATURE_STATE_CHANGE_BEEP },
};

static void
load_keyboard_a11y_settings (MetaInputSettings *input_settings)
{
  MetaInputSettingsPrivate *priv = meta_input_settings_get_instance_private (input_settings);
  MetaKbdA11ySettings kbd_a11y_settings = { 0 };
  guint i;

  kbd_a11y_settings.controls = 0;
  for (i = 0; i < G_N_ELEMENTS (keyboard_a11y_settings_flags_pair); i++)
    {
      if (g_settings_get_boolean (priv->keyboard_a11y_settings, keyboard_a11y_settings_flags_pair[i].name))
        kbd_a11y_settings.controls |= keyboard_a11y_settings_flags_pair[i].flag;
    }

  kbd_a11y_settings.timeout_delay = g_settings_get_int (priv->keyboard_a11y_settings,
                                                        "disable-timeout");
  kbd_a11y_settings.slowkeys_delay = g_settings_get_int (priv->keyboard_a11y_settings,
                                                         "slowkeys-delay");
  kbd_a11y_settings.debounce_delay = g_settings_get_int (priv->keyboard_a11y_settings,
                                                         "bouncekeys-delay");
  kbd_a11y_settings.mousekeys_init_delay = g_settings_get_int (priv->keyboard_a11y_settings,
                                                               "mousekeys-init-delay");
  kbd_a11y_settings.mousekeys_max_speed = g_settings_get_int (priv->keyboard_a11y_settings,
                                                              "mousekeys-max-speed");
  kbd_a11y_settings.mousekeys_accel_time = g_settings_get_int (priv->keyboard_a11y_settings,
                                                               "mousekeys-accel-time");

  priv->kbd_a11y_settings = kbd_a11y_settings;
  g_signal_emit (input_settings, signals[KBD_A11Y_CHANGED], 0, &priv->kbd_a11y_settings);
}

void
meta_input_settings_notify_kbd_a11y_change (MetaInputSettings     *input_settings,
                                            MetaKeyboardA11yFlags  new_flags,
                                            MetaKeyboardA11yFlags  what_changed)
{
  MetaInputSettingsPrivate *priv = meta_input_settings_get_instance_private (input_settings);
  guint i;

  for (i = 0; i < G_N_ELEMENTS (keyboard_a11y_settings_flags_pair); i++)
    {
      if (keyboard_a11y_settings_flags_pair[i].flag & what_changed)
        g_settings_set_boolean (priv->keyboard_a11y_settings,
                                keyboard_a11y_settings_flags_pair[i].name,
                                (new_flags & keyboard_a11y_settings_flags_pair[i].flag) ? TRUE : FALSE);
    }
}

static void
meta_input_keyboard_a11y_settings_changed (GSettings  *settings,
                                           const char *key,
                                           gpointer    user_data)
{
  MetaInputSettings *input_settings = META_INPUT_SETTINGS (user_data);

  load_keyboard_a11y_settings (input_settings);
}

static GSettings *
lookup_device_settings (ClutterInputDevice *device)
{
  const gchar *group, *schema, *vendor, *product;
  ClutterInputCapabilities capabilities;
  GSettings *settings;
  gchar *path;

  capabilities = clutter_input_device_get_capabilities (device);

  if ((capabilities &
       (CLUTTER_INPUT_CAPABILITY_TABLET_TOOL |
        CLUTTER_INPUT_CAPABILITY_TABLET_PAD)) != 0)
    {
      group = "tablets";
      schema = "org.gnome.desktop.peripherals.tablet";
    }
  else if ((capabilities & CLUTTER_INPUT_CAPABILITY_TOUCH) != 0)
    {
      group = "touchscreens";
      schema = "org.gnome.desktop.peripherals.touchscreen";
    }
  else
    {
      return NULL;
    }

  vendor = clutter_input_device_get_vendor_id (device);
  product = clutter_input_device_get_product_id (device);
  path = g_strdup_printf ("/org/gnome/desktop/peripherals/%s/%s:%s/",
                          group, vendor, product);

  settings = g_settings_new_with_path (schema, path);
  g_free (path);

  return settings;
}

static GSettings *
lookup_tool_settings (ClutterInputDeviceTool *tool,
                      ClutterInputDevice     *device)
{
  GSettings *tool_settings;
  guint64 serial;
  gchar *path;

  tool_settings = g_object_get_qdata (G_OBJECT (tool), quark_tool_settings);
  if (tool_settings)
    return tool_settings;

  serial = clutter_input_device_tool_get_serial (tool);

  /* The Wacom driver uses serial 1 for serial-less devices but 1 is not a
   * real serial, so let's custom-case this */
  if (serial == 0 || serial == 1)
    {
      path = g_strdup_printf ("/org/gnome/desktop/peripherals/stylus/default-%s:%s/",
                              clutter_input_device_get_vendor_id (device),
                              clutter_input_device_get_product_id (device));
    }
  else
    {
      path = g_strdup_printf ("/org/gnome/desktop/peripherals/stylus/%" G_GINT64_MODIFIER "x/",
                              serial);
    }

  tool_settings =
    g_settings_new_with_path ("org.gnome.desktop.peripherals.tablet.stylus",
                              path);
  g_object_set_qdata_full (G_OBJECT (tool), quark_tool_settings, tool_settings,
                           (GDestroyNotify) g_object_unref);
  g_free (path);

  return tool_settings;
}

static void
device_mapping_info_free (DeviceMappingInfo *info)
{
  g_clear_signal_handler (&info->changed_id, info->settings);
  g_object_unref (info->settings);
  g_free (info->group_modes);
  g_free (info);
}

static gboolean
check_add_mappable_device (MetaInputSettings  *input_settings,
                           ClutterInputDevice *device)
{
  MetaInputSettingsPrivate *priv;
  DeviceMappingInfo *info;
  ClutterInputCapabilities capabilities;
  GSettings *settings;

  capabilities = clutter_input_device_get_capabilities (device);

  if ((capabilities &
       (CLUTTER_INPUT_CAPABILITY_TABLET_TOOL |
        CLUTTER_INPUT_CAPABILITY_TABLET_PAD)) != 0 &&
      g_getenv ("MUTTER_DISABLE_WACOM_CONFIGURATION") != NULL)
    return FALSE;

  settings = lookup_device_settings (device);

  if (!settings)
    return FALSE;

  priv = meta_input_settings_get_instance_private (input_settings);

  info = g_new0 (DeviceMappingInfo, 1);
  info->input_settings = input_settings;
  info->device = device;
  info->settings = settings;

  if ((capabilities & CLUTTER_INPUT_CAPABILITY_TABLET_PAD) != 0)
    {
      info->group_modes =
        g_new0 (guint, clutter_input_device_get_n_mode_groups (device));
    }

  info->changed_id = g_signal_connect (settings, "changed",
                                       G_CALLBACK (mapped_device_changed_cb),
                                       info);

  g_hash_table_insert (priv->mappable_devices, device, info);

  apply_mappable_device_settings (input_settings, info);

  return TRUE;
}

static void
apply_device_settings (MetaInputSettings  *input_settings,
                       ClutterInputDevice *device)
{
  MetaInputSettingsPrivate *priv =
    meta_input_settings_get_instance_private (input_settings);

  update_device_speed (input_settings, device);
  update_device_natural_scroll (input_settings, device);

  update_mouse_left_handed (input_settings, device);
  update_pointer_accel_profile (input_settings,
                                priv->mouse_settings,
                                device);

  update_touchpad_left_handed (input_settings, device);
  update_touchpad_tap_enabled (input_settings, device);
  update_touchpad_tap_button_map (input_settings, device);
  update_touchpad_tap_and_drag_enabled (input_settings, device);
  update_touchpad_tap_and_drag_lock_enabled (input_settings, device);
  update_touchpad_disable_while_typing (input_settings, device);
  update_touchpad_send_events (input_settings, device);
  update_touchpad_two_finger_scroll (input_settings, device);
  update_touchpad_edge_scroll (input_settings, device);
  update_touchpad_click_method (input_settings, device);

  update_trackball_scroll_button (input_settings, device);
  update_pointer_accel_profile (input_settings,
                                priv->trackball_settings,
                                device);

  update_middle_click_emulation (input_settings, priv->mouse_settings, device);
  update_middle_click_emulation (input_settings, priv->touchpad_settings, device);
  update_middle_click_emulation (input_settings, priv->trackball_settings, device);
}

static void
update_stylus_pressure (MetaInputSettings      *input_settings,
                        ClutterInputDevice     *device,
                        ClutterInputDeviceTool *tool)
{
  MetaInputSettingsClass *input_settings_class;
  GSettings *tool_settings;
  const gint32 *curve;
  GVariant *variant;
  gsize n_elems;

  if ((clutter_input_device_get_capabilities (device) &
       CLUTTER_INPUT_CAPABILITY_TABLET_TOOL) == 0)
    return;

  if (!tool)
    return;

  tool_settings = lookup_tool_settings (tool, device);

  if (clutter_input_device_tool_get_tool_type (tool) ==
      CLUTTER_INPUT_DEVICE_TOOL_ERASER)
    variant = g_settings_get_value (tool_settings, "eraser-pressure-curve");
  else
    variant = g_settings_get_value (tool_settings, "pressure-curve");

  curve = g_variant_get_fixed_array (variant, &n_elems, sizeof (gint32));
  if (n_elems != 4)
    return;

  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  input_settings_class->set_stylus_pressure (input_settings, device, tool, curve);
}

static void
update_stylus_buttonmap (MetaInputSettings      *input_settings,
                         ClutterInputDevice     *device,
                         ClutterInputDeviceTool *tool)
{
  MetaInputSettingsClass *input_settings_class;
  GDesktopStylusButtonAction primary, secondary, tertiary;
  GSettings *tool_settings;

  if ((clutter_input_device_get_capabilities (device) &
       CLUTTER_INPUT_CAPABILITY_TABLET_TOOL) == 0)
    return;

  if (!tool)
    return;

  tool_settings = lookup_tool_settings (tool, device);

  primary = g_settings_get_enum (tool_settings, "button-action");
  secondary = g_settings_get_enum (tool_settings, "secondary-button-action");
  tertiary = g_settings_get_enum (tool_settings, "tertiary-button-action");

  input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  input_settings_class->set_stylus_button_map (input_settings, device, tool,
                                               primary, secondary, tertiary);
}

static void
apply_stylus_settings (MetaInputSettings      *input_settings,
                       ClutterInputDevice     *device,
                       ClutterInputDeviceTool *tool)
{
  update_stylus_pressure (input_settings, device, tool);
  update_stylus_buttonmap (input_settings, device, tool);
}

static void
evaluate_two_finger_scrolling (MetaInputSettings  *input_settings,
                               ClutterInputDevice *device)
{
  MetaInputSettingsClass *klass;
  MetaInputSettingsPrivate *priv;

  if ((clutter_input_device_get_capabilities (device) &
       CLUTTER_INPUT_CAPABILITY_TOUCHPAD) == 0)
    return;

  klass = META_INPUT_SETTINGS_GET_CLASS (input_settings);
  priv = meta_input_settings_get_instance_private (input_settings);

  if (klass->has_two_finger_scroll (input_settings, device))
    g_hash_table_add (priv->two_finger_devices, device);
}

void
meta_input_settings_add_device (MetaInputSettings  *input_settings,
                                ClutterInputDevice *device)
{
  MetaInputSettingsPrivate *priv =
    meta_input_settings_get_instance_private (input_settings);

  if (clutter_input_device_get_device_mode (device) == CLUTTER_INPUT_MODE_LOGICAL)
    return;

  priv->devices = g_list_prepend (priv->devices, device);
  evaluate_two_finger_scrolling (input_settings, device);

  apply_device_settings (input_settings, device);
  check_add_mappable_device (input_settings, device);
}

void
meta_input_settings_remove_device (MetaInputSettings  *input_settings,
                                   ClutterInputDevice *device)
{
  MetaInputSettingsPrivate *priv;

  priv = meta_input_settings_get_instance_private (input_settings);
  g_hash_table_remove (priv->mappable_devices, device);
  g_hash_table_remove (priv->current_tools, device);

  if (g_hash_table_remove (priv->two_finger_devices, device) &&
      g_hash_table_size (priv->two_finger_devices) == 0)
    apply_device_settings (input_settings, NULL);

  priv->devices = g_list_remove (priv->devices, device);
}

static void
current_tool_changed_cb (GSettings  *settings,
                         const char *key,
                         gpointer    user_data)
{
  CurrentToolInfo *info = user_data;

  apply_stylus_settings (info->input_settings, info->device, info->tool);
}

static CurrentToolInfo *
current_tool_info_new (MetaInputSettings      *input_settings,
                       ClutterInputDevice     *device,
                       ClutterInputDeviceTool *tool)
{
  CurrentToolInfo *info;

  info = g_new0 (CurrentToolInfo, 1);
  info->input_settings = input_settings;
  info->device = device;
  info->tool = tool;
  info->settings = lookup_tool_settings (tool, device);
  info->changed_id =
    g_signal_connect (info->settings, "changed",
                      G_CALLBACK (current_tool_changed_cb),
                      info);
  return info;
}

static void
current_tool_info_free (CurrentToolInfo *info)
{
  g_clear_signal_handler (&info->changed_id, info->settings);
  g_free (info);
}

void
meta_input_settings_notify_tool_change (MetaInputSettings      *input_settings,
                                        ClutterInputDevice     *device,
                                        ClutterInputDeviceTool *tool)
{
  MetaInputSettingsPrivate *priv;

  priv = meta_input_settings_get_instance_private (input_settings);

  if (tool)
    {
      CurrentToolInfo *current_tool;

      current_tool = current_tool_info_new (input_settings, device, tool);
      g_hash_table_insert (priv->current_tools, device, current_tool);
      apply_stylus_settings (input_settings, device, tool);
    }
  else
    {
      g_hash_table_remove (priv->current_tools, device);
    }
}

static void
check_mappable_devices (MetaInputSettings *input_settings)
{
  MetaInputSettingsPrivate *priv;
  GList *l;

  priv = meta_input_settings_get_instance_private (input_settings);

  for (l = priv->devices; l; l = l->next)
    {
      ClutterInputDevice *device = l->data;

      if (clutter_input_device_get_device_mode (device) == CLUTTER_INPUT_MODE_LOGICAL)
        continue;

      check_add_mappable_device (input_settings, device);
    }
}

static void
meta_input_settings_constructed (GObject *object)
{
  MetaInputSettings *input_settings = META_INPUT_SETTINGS (object);
  GSList *devices, *d;

  devices = meta_input_settings_get_devices (input_settings,
                                             CLUTTER_INPUT_CAPABILITY_TOUCHPAD,
                                             CLUTTER_INPUT_CAPABILITY_NONE);
  for (d = devices; d; d = d->next)
    evaluate_two_finger_scrolling (input_settings, d->data);

  g_slist_free (devices);

  apply_device_settings (input_settings, NULL);
  update_keyboard_repeat (input_settings);
  check_mappable_devices (input_settings);

  load_keyboard_a11y_settings (input_settings);
}

static void
meta_input_settings_set_property (GObject      *object,
                                  guint         prop_id,
                                  const GValue *value,
                                  GParamSpec   *pspec)
{
  MetaInputSettings *settings = META_INPUT_SETTINGS (object);
  MetaInputSettingsPrivate *priv =
    meta_input_settings_get_instance_private (settings);

  switch (prop_id)
    {
    case PROP_BACKEND:
      priv->backend = g_value_get_object (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}

static void
meta_input_settings_class_init (MetaInputSettingsClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->dispose = meta_input_settings_dispose;
  object_class->constructed = meta_input_settings_constructed;
  object_class->set_property = meta_input_settings_set_property;

  props[PROP_BACKEND] =
    g_param_spec_object ("backend",
                         "backend",
                         "MetaBackend",
                         META_TYPE_BACKEND,
                         G_PARAM_WRITABLE |
                         G_PARAM_CONSTRUCT_ONLY |
                         G_PARAM_STATIC_STRINGS);
  g_object_class_install_properties (object_class, N_PROPS, props);

  quark_tool_settings =
    g_quark_from_static_string ("meta-input-settings-tool-settings");

  signals[KBD_A11Y_CHANGED] =
    g_signal_new ("kbd-a11y-changed",
                  G_TYPE_FROM_CLASS (object_class),
                  G_SIGNAL_RUN_LAST,
                  0, NULL, NULL, NULL,
                  G_TYPE_NONE, 1,
                  G_TYPE_POINTER);

}

static void
meta_input_settings_init (MetaInputSettings *settings)
{
  MetaInputSettingsPrivate *priv;

  priv = meta_input_settings_get_instance_private (settings);

  priv->mouse_settings = g_settings_new ("org.gnome.desktop.peripherals.mouse");
  g_signal_connect (priv->mouse_settings, "changed",
                    G_CALLBACK (meta_input_settings_changed_cb), settings);

  priv->touchpad_settings = g_settings_new ("org.gnome.desktop.peripherals.touchpad");
  g_signal_connect (priv->touchpad_settings, "changed",
                    G_CALLBACK (meta_input_settings_changed_cb), settings);

  priv->trackball_settings = g_settings_new ("org.gnome.desktop.peripherals.trackball");
  g_signal_connect (priv->trackball_settings, "changed",
                    G_CALLBACK (meta_input_settings_changed_cb), settings);

  priv->keyboard_settings = g_settings_new ("org.gnome.desktop.peripherals.keyboard");
  g_signal_connect (priv->keyboard_settings, "changed",
                    G_CALLBACK (meta_input_settings_changed_cb), settings);

  priv->keyboard_a11y_settings = g_settings_new ("org.gnome.desktop.a11y.keyboard");
  g_signal_connect (priv->keyboard_a11y_settings, "changed",
                    G_CALLBACK (meta_input_keyboard_a11y_settings_changed), settings);

  priv->mappable_devices =
    g_hash_table_new_full (NULL, NULL, NULL, (GDestroyNotify) device_mapping_info_free);

  priv->current_tools =
    g_hash_table_new_full (NULL, NULL, NULL, (GDestroyNotify) current_tool_info_free);

  priv->two_finger_devices = g_hash_table_new (NULL, NULL);
}

void
meta_input_settings_maybe_save_numlock_state (MetaInputSettings *input_settings,
                                              gboolean           numlock_state)
{
  MetaInputSettingsPrivate *priv;

  priv = meta_input_settings_get_instance_private (input_settings);

  if (!g_settings_get_boolean (priv->keyboard_settings, "remember-numlock-state"))
    return;

  if (numlock_state == g_settings_get_boolean (priv->keyboard_settings, "numlock-state"))
    return;

  g_settings_set_boolean (priv->keyboard_settings, "numlock-state", numlock_state);
}

gboolean
meta_input_settings_maybe_restore_numlock_state (MetaInputSettings *input_settings)
{
  MetaInputSettingsPrivate *priv;
  gboolean numlock_state = FALSE;

  priv = meta_input_settings_get_instance_private (input_settings);

  if (g_settings_get_boolean (priv->keyboard_settings, "remember-numlock-state"))
    numlock_state = g_settings_get_boolean (priv->keyboard_settings, "numlock-state");

  return numlock_state;
}

void
meta_input_settings_set_device_matrix (MetaInputSettings  *input_settings,
                                       ClutterInputDevice *device,
                                       float               matrix[6])
{
  g_return_if_fail (META_IS_INPUT_SETTINGS (input_settings));
  g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));

  META_INPUT_SETTINGS_GET_CLASS (input_settings)->set_matrix (input_settings,
                                                              device,
                                                              matrix);
}

void
meta_input_settings_set_device_enabled (MetaInputSettings  *input_settings,
                                        ClutterInputDevice *device,
                                        gboolean            enabled)
{
  GDesktopDeviceSendEvents mode;

  g_return_if_fail (META_IS_INPUT_SETTINGS (input_settings));
  g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));

  mode = enabled ?
    G_DESKTOP_DEVICE_SEND_EVENTS_ENABLED :
    G_DESKTOP_DEVICE_SEND_EVENTS_DISABLED;

  META_INPUT_SETTINGS_GET_CLASS (input_settings)->set_send_events (input_settings,
                                                                   device,
                                                                   mode);
}

void
meta_input_settings_set_device_aspect_ratio (MetaInputSettings  *input_settings,
                                             ClutterInputDevice *device,
                                             double              aspect_ratio)
{
  MetaInputSettingsPrivate *priv;
  DeviceMappingInfo *info;

  g_return_if_fail (META_IS_INPUT_SETTINGS (input_settings));
  g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));

  priv = meta_input_settings_get_instance_private (input_settings);

  info = g_hash_table_lookup (priv->mappable_devices, device);
  if (!info)
    return;

  info->aspect_ratio = aspect_ratio;
  update_tablet_keep_aspect (input_settings, info->settings, device);
}

void
meta_input_settings_get_kbd_a11y_settings (MetaInputSettings   *input_settings,
                                           MetaKbdA11ySettings *a11y_settings)
{
  MetaInputSettingsPrivate *priv;

  g_return_if_fail (META_IS_INPUT_SETTINGS (input_settings));

  priv = meta_input_settings_get_instance_private (input_settings);

  *a11y_settings = priv->kbd_a11y_settings;
}

MetaBackend *
meta_input_settings_get_backend (MetaInputSettings *settings)
{
  MetaInputSettingsPrivate *priv =
    meta_input_settings_get_instance_private (settings);

  return priv->backend;
}
