mutter/src/backends/native/meta-virtual-input-device-native.c
Jonas Dreßler 9f31e7252c backends/native: Release virtual buttons on dispose instead of finalize
GObject recommends to break references to other objects on dispose
instead of finalize, also we want to release the pressed virtual buttons
as early as possible if we know the object is getting destroyed.

So release the pressed buttons and unref our virtual
MetaInputDeviceNative when the dispose vfunc is called, which also
allows us to release the buttons immediately from javascript instead of
waiting for the garbage collector by calling run_dispose() on the
object.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1157
2020-03-28 16:55:59 +00:00

762 lines
27 KiB
C

/*
* Copyright (C) 2016 Red Hat Inc.
*
* 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/>.
*
* Author: Jonas Ådahl <jadahl@gmail.com>
*/
#include "config.h"
#include <glib-object.h>
#include <linux/input.h>
#include "backends/native/meta-input-device-native.h"
#include "backends/native/meta-keymap-native.h"
#include "backends/native/meta-seat-native.h"
#include "backends/native/meta-virtual-input-device-native.h"
#include "clutter/clutter-mutter.h"
#include "meta/util.h"
enum
{
PROP_0,
PROP_SEAT,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST];
struct _MetaVirtualInputDeviceNative
{
ClutterVirtualInputDevice parent;
ClutterInputDevice *device;
MetaSeatNative *seat;
int button_count[KEY_CNT];
};
G_DEFINE_TYPE (MetaVirtualInputDeviceNative,
meta_virtual_input_device_native,
CLUTTER_TYPE_VIRTUAL_INPUT_DEVICE)
typedef enum _EvdevButtonType
{
EVDEV_BUTTON_TYPE_NONE,
EVDEV_BUTTON_TYPE_KEY,
EVDEV_BUTTON_TYPE_BUTTON,
} EvdevButtonType;
static int
update_button_count (MetaVirtualInputDeviceNative *virtual_evdev,
uint32_t button,
uint32_t state)
{
if (state)
return ++virtual_evdev->button_count[button];
else
return --virtual_evdev->button_count[button];
}
static EvdevButtonType
get_button_type (uint16_t code)
{
switch (code)
{
case BTN_TOOL_PEN:
case BTN_TOOL_RUBBER:
case BTN_TOOL_BRUSH:
case BTN_TOOL_PENCIL:
case BTN_TOOL_AIRBRUSH:
case BTN_TOOL_MOUSE:
case BTN_TOOL_LENS:
case BTN_TOOL_QUINTTAP:
case BTN_TOOL_DOUBLETAP:
case BTN_TOOL_TRIPLETAP:
case BTN_TOOL_QUADTAP:
case BTN_TOOL_FINGER:
case BTN_TOUCH:
return EVDEV_BUTTON_TYPE_NONE;
}
if (code >= KEY_ESC && code <= KEY_MICMUTE)
return EVDEV_BUTTON_TYPE_KEY;
if (code >= BTN_MISC && code <= BTN_GEAR_UP)
return EVDEV_BUTTON_TYPE_BUTTON;
if (code >= KEY_OK && code <= KEY_LIGHTS_TOGGLE)
return EVDEV_BUTTON_TYPE_KEY;
if (code >= BTN_DPAD_UP && code <= BTN_DPAD_RIGHT)
return EVDEV_BUTTON_TYPE_BUTTON;
if (code >= KEY_ALS_TOGGLE && code <= KEY_KBDINPUTASSIST_CANCEL)
return EVDEV_BUTTON_TYPE_KEY;
if (code >= BTN_TRIGGER_HAPPY && code <= BTN_TRIGGER_HAPPY40)
return EVDEV_BUTTON_TYPE_BUTTON;
return EVDEV_BUTTON_TYPE_NONE;
}
static void
release_pressed_buttons (ClutterVirtualInputDevice *virtual_device)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
int code;
uint64_t time_us;
time_us = g_get_monotonic_time ();
meta_topic (META_DEBUG_INPUT,
"Releasing pressed buttons while destroying virtual input device "
"(device %p)\n", virtual_device);
for (code = 0; code < G_N_ELEMENTS (virtual_evdev->button_count); code++)
{
if (virtual_evdev->button_count[code] == 0)
continue;
switch (get_button_type (code))
{
case EVDEV_BUTTON_TYPE_KEY:
clutter_virtual_input_device_notify_key (virtual_device,
time_us,
code,
CLUTTER_KEY_STATE_RELEASED);
break;
case EVDEV_BUTTON_TYPE_BUTTON:
clutter_virtual_input_device_notify_button (virtual_device,
time_us,
code,
CLUTTER_BUTTON_STATE_RELEASED);
break;
case EVDEV_BUTTON_TYPE_NONE:
g_assert_not_reached ();
}
}
}
static void
meta_virtual_input_device_native_notify_relative_motion (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
double dx,
double dy)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
meta_seat_native_notify_relative_motion (virtual_evdev->seat,
virtual_evdev->device,
time_us,
dx, dy,
dx, dy);
}
static void
meta_virtual_input_device_native_notify_absolute_motion (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
double x,
double y)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
meta_seat_native_notify_absolute_motion (virtual_evdev->seat,
virtual_evdev->device,
time_us,
x, y,
NULL);
}
static int
translate_to_evdev_button (int clutter_button)
{
switch (clutter_button)
{
case CLUTTER_BUTTON_PRIMARY:
return BTN_LEFT;
case CLUTTER_BUTTON_SECONDARY:
return BTN_RIGHT;
case CLUTTER_BUTTON_MIDDLE:
return BTN_MIDDLE;
default:
/*
* For compatibility reasons, all additional buttons go after the old
* 4-7 scroll ones.
*/
return clutter_button + (BTN_LEFT - 1) - 4;
}
}
static void
meta_virtual_input_device_native_notify_button (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
uint32_t button,
ClutterButtonState button_state)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
int button_count;
int evdev_button;
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
evdev_button = translate_to_evdev_button (button);
if (get_button_type (evdev_button) != EVDEV_BUTTON_TYPE_BUTTON)
{
g_warning ("Unknown/invalid virtual device button 0x%x pressed",
evdev_button);
return;
}
button_count = update_button_count (virtual_evdev, evdev_button, button_state);
if (button_count < 0 || button_count > 1)
{
g_warning ("Received multiple virtual 0x%x button %s (ignoring)", evdev_button,
button_state == CLUTTER_BUTTON_STATE_PRESSED ? "presses" : "releases");
update_button_count (virtual_evdev, evdev_button, 1 - button_state);
return;
}
meta_topic (META_DEBUG_INPUT,
"Emitting virtual button-%s of button 0x%x (device %p)\n",
button_state == CLUTTER_BUTTON_STATE_PRESSED ? "press" : "release",
evdev_button, virtual_device);
meta_seat_native_notify_button (virtual_evdev->seat,
virtual_evdev->device,
time_us,
evdev_button,
button_state);
}
static void
meta_virtual_input_device_native_notify_key (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
uint32_t key,
ClutterKeyState key_state)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
int key_count;
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
if (get_button_type (key) != EVDEV_BUTTON_TYPE_KEY)
{
g_warning ("Unknown/invalid virtual device key 0x%x pressed\n", key);
return;
}
key_count = update_button_count (virtual_evdev, key, key_state);
if (key_count < 0 || key_count > 1)
{
g_warning ("Received multiple virtual 0x%x key %s (ignoring)", key,
key_state == CLUTTER_KEY_STATE_PRESSED ? "presses" : "releases");
update_button_count (virtual_evdev, key, 1 - key_state);
return;
}
meta_topic (META_DEBUG_INPUT,
"Emitting virtual key-%s of key 0x%x (device %p)\n",
key_state == CLUTTER_KEY_STATE_PRESSED ? "press" : "release",
key, virtual_device);
meta_seat_native_notify_key (virtual_evdev->seat,
virtual_evdev->device,
time_us,
key,
key_state,
TRUE);
}
static gboolean
pick_keycode_for_keyval_in_current_group (ClutterVirtualInputDevice *virtual_device,
guint keyval,
guint *keycode_out,
guint *level_out)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
ClutterBackend *backend;
ClutterKeymap *keymap;
struct xkb_keymap *xkb_keymap;
struct xkb_state *state;
guint keycode, layout;
xkb_keycode_t min_keycode, max_keycode;
backend = clutter_get_default_backend ();
keymap = clutter_seat_get_keymap (clutter_backend_get_default_seat (backend));
xkb_keymap = meta_keymap_native_get_keyboard_map (META_KEYMAP_NATIVE (keymap));
state = virtual_evdev->seat->xkb;
layout = xkb_state_serialize_layout (state, XKB_STATE_LAYOUT_EFFECTIVE);
min_keycode = xkb_keymap_min_keycode (xkb_keymap);
max_keycode = xkb_keymap_max_keycode (xkb_keymap);
for (keycode = min_keycode; keycode < max_keycode; keycode++)
{
gint num_levels, level;
num_levels = xkb_keymap_num_levels_for_key (xkb_keymap, keycode, layout);
for (level = 0; level < num_levels; level++)
{
const xkb_keysym_t *syms;
gint num_syms, sym;
num_syms = xkb_keymap_key_get_syms_by_level (xkb_keymap, keycode, layout, level, &syms);
for (sym = 0; sym < num_syms; sym++)
{
if (syms[sym] == keyval)
{
*keycode_out = keycode;
if (level_out)
*level_out = level;
return TRUE;
}
}
}
}
return FALSE;
}
static void
apply_level_modifiers (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
uint32_t level,
uint32_t key_state)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
guint keysym, keycode, evcode;
if (level == 0)
return;
if (level == 1)
{
keysym = XKB_KEY_Shift_L;
}
else if (level == 2)
{
keysym = XKB_KEY_ISO_Level3_Shift;
}
else
{
g_warning ("Unhandled level: %d\n", level);
return;
}
if (!pick_keycode_for_keyval_in_current_group (virtual_device, keysym,
&keycode, NULL))
return;
clutter_input_device_keycode_to_evdev (virtual_evdev->device,
keycode, &evcode);
meta_topic (META_DEBUG_INPUT,
"Emitting virtual key-%s of modifier key 0x%x (device %p)\n",
key_state == CLUTTER_KEY_STATE_PRESSED ? "press" : "release",
evcode, virtual_device);
meta_seat_native_notify_key (virtual_evdev->seat,
virtual_evdev->device,
time_us,
evcode,
key_state,
TRUE);
}
static void
meta_virtual_input_device_native_notify_keyval (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
uint32_t keyval,
ClutterKeyState key_state)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
int key_count;
guint keycode = 0, level = 0, evcode = 0;
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
if (!pick_keycode_for_keyval_in_current_group (virtual_device,
keyval, &keycode, &level))
{
g_warning ("No keycode found for keyval %x in current group", keyval);
return;
}
clutter_input_device_keycode_to_evdev (virtual_evdev->device,
keycode, &evcode);
if (get_button_type (evcode) != EVDEV_BUTTON_TYPE_KEY)
{
g_warning ("Unknown/invalid virtual device key 0x%x pressed\n", evcode);
return;
}
key_count = update_button_count (virtual_evdev, evcode, key_state);
if (key_count < 0 || key_count > 1)
{
g_warning ("Received multiple virtual 0x%x key %s (ignoring)", evcode,
key_state == CLUTTER_KEY_STATE_PRESSED ? "presses" : "releases");
update_button_count (virtual_evdev, evcode, 1 - key_state);
return;
}
meta_topic (META_DEBUG_INPUT,
"Emitting virtual key-%s of key 0x%x with modifier level %d, "
"press count %d (device %p)\n",
key_state == CLUTTER_KEY_STATE_PRESSED ? "press" : "release",
evcode, level, key_count, virtual_device);
if (key_state)
apply_level_modifiers (virtual_device, time_us, level, key_state);
meta_seat_native_notify_key (virtual_evdev->seat,
virtual_evdev->device,
time_us,
evcode,
key_state,
TRUE);
if (!key_state)
apply_level_modifiers (virtual_device, time_us, level, key_state);
}
static void
direction_to_discrete (ClutterScrollDirection direction,
double *discrete_dx,
double *discrete_dy)
{
switch (direction)
{
case CLUTTER_SCROLL_UP:
*discrete_dx = 0.0;
*discrete_dy = -1.0;
break;
case CLUTTER_SCROLL_DOWN:
*discrete_dx = 0.0;
*discrete_dy = 1.0;
break;
case CLUTTER_SCROLL_LEFT:
*discrete_dx = -1.0;
*discrete_dy = 0.0;
break;
case CLUTTER_SCROLL_RIGHT:
*discrete_dx = 1.0;
*discrete_dy = 0.0;
break;
case CLUTTER_SCROLL_SMOOTH:
g_assert_not_reached ();
break;
}
}
static void
meta_virtual_input_device_native_notify_discrete_scroll (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
ClutterScrollDirection direction,
ClutterScrollSource scroll_source)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
double discrete_dx = 0.0, discrete_dy = 0.0;
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
direction_to_discrete (direction, &discrete_dx, &discrete_dy);
meta_seat_native_notify_discrete_scroll (virtual_evdev->seat,
virtual_evdev->device,
time_us,
discrete_dx, discrete_dy,
scroll_source);
}
static void
meta_virtual_input_device_native_notify_scroll_continuous (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
double dx,
double dy,
ClutterScrollSource scroll_source,
ClutterScrollFinishFlags finish_flags)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
meta_seat_native_notify_scroll_continuous (virtual_evdev->seat,
virtual_evdev->device,
time_us,
dx, dy,
scroll_source,
CLUTTER_SCROLL_FINISHED_NONE);
}
static void
meta_virtual_input_device_native_notify_touch_down (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
int device_slot,
double x,
double y)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
MetaInputDeviceNative *device_evdev =
META_INPUT_DEVICE_NATIVE (virtual_evdev->device);
MetaTouchState *touch_state;
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
touch_state = meta_input_device_native_acquire_touch_state (device_evdev,
device_slot);
if (!touch_state)
return;
touch_state->coords.x = x;
touch_state->coords.y = y;
meta_seat_native_notify_touch_event (virtual_evdev->seat,
virtual_evdev->device,
CLUTTER_TOUCH_BEGIN,
time_us,
touch_state->seat_slot,
touch_state->coords.x,
touch_state->coords.y);
}
static void
meta_virtual_input_device_native_notify_touch_motion (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
int device_slot,
double x,
double y)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
MetaInputDeviceNative *device_evdev =
META_INPUT_DEVICE_NATIVE (virtual_evdev->device);
MetaTouchState *touch_state;
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
touch_state = meta_input_device_native_lookup_touch_state (device_evdev,
device_slot);
if (!touch_state)
return;
touch_state->coords.x = x;
touch_state->coords.y = y;
meta_seat_native_notify_touch_event (virtual_evdev->seat,
virtual_evdev->device,
CLUTTER_TOUCH_BEGIN,
time_us,
touch_state->seat_slot,
touch_state->coords.x,
touch_state->coords.y);
}
static void
meta_virtual_input_device_native_notify_touch_up (ClutterVirtualInputDevice *virtual_device,
uint64_t time_us,
int device_slot)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (virtual_device);
MetaInputDeviceNative *device_evdev =
META_INPUT_DEVICE_NATIVE (virtual_evdev->device);
MetaTouchState *touch_state;
g_return_if_fail (virtual_evdev->device != NULL);
if (time_us == CLUTTER_CURRENT_TIME)
time_us = g_get_monotonic_time ();
touch_state = meta_input_device_native_lookup_touch_state (device_evdev,
device_slot);
if (!touch_state)
return;
meta_seat_native_notify_touch_event (virtual_evdev->seat,
virtual_evdev->device,
CLUTTER_TOUCH_BEGIN,
time_us,
touch_state->seat_slot,
touch_state->coords.x,
touch_state->coords.y);
meta_input_device_native_release_touch_state (device_evdev, touch_state);
}
static void
meta_virtual_input_device_native_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (object);
switch (prop_id)
{
case PROP_SEAT:
g_value_set_pointer (value, virtual_evdev->seat);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
meta_virtual_input_device_native_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (object);
switch (prop_id)
{
case PROP_SEAT:
virtual_evdev->seat = g_value_get_pointer (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
meta_virtual_input_device_native_constructed (GObject *object)
{
ClutterVirtualInputDevice *virtual_device =
CLUTTER_VIRTUAL_INPUT_DEVICE (object);
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (object);
ClutterInputDeviceType device_type;
ClutterStage *stage;
device_type = clutter_virtual_input_device_get_device_type (virtual_device);
meta_topic (META_DEBUG_INPUT,
"Creating new virtual input device of type %d (%p)\n",
device_type, virtual_device);
virtual_evdev->device =
meta_input_device_native_new_virtual (virtual_evdev->seat,
device_type,
CLUTTER_INPUT_MODE_SLAVE);
stage = meta_seat_native_get_stage (virtual_evdev->seat);
_clutter_input_device_set_stage (virtual_evdev->device, stage);
g_signal_emit_by_name (virtual_evdev->seat,
"device-added",
virtual_evdev->device);
}
static void
meta_virtual_input_device_native_dispose (GObject *object)
{
ClutterVirtualInputDevice *virtual_device =
CLUTTER_VIRTUAL_INPUT_DEVICE (object);
MetaVirtualInputDeviceNative *virtual_evdev =
META_VIRTUAL_INPUT_DEVICE_NATIVE (object);
GObjectClass *object_class =
G_OBJECT_CLASS (meta_virtual_input_device_native_parent_class);
if (virtual_evdev->device)
{
release_pressed_buttons (virtual_device);
g_signal_emit_by_name (virtual_evdev->seat,
"device-removed",
virtual_evdev->device);
g_clear_object (&virtual_evdev->device);
}
object_class->dispose (object);
}
static void
meta_virtual_input_device_native_init (MetaVirtualInputDeviceNative *virtual_device_evdev)
{
}
static void
meta_virtual_input_device_native_class_init (MetaVirtualInputDeviceNativeClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
ClutterVirtualInputDeviceClass *virtual_input_device_class =
CLUTTER_VIRTUAL_INPUT_DEVICE_CLASS (klass);
object_class->get_property = meta_virtual_input_device_native_get_property;
object_class->set_property = meta_virtual_input_device_native_set_property;
object_class->constructed = meta_virtual_input_device_native_constructed;
object_class->dispose = meta_virtual_input_device_native_dispose;
virtual_input_device_class->notify_relative_motion = meta_virtual_input_device_native_notify_relative_motion;
virtual_input_device_class->notify_absolute_motion = meta_virtual_input_device_native_notify_absolute_motion;
virtual_input_device_class->notify_button = meta_virtual_input_device_native_notify_button;
virtual_input_device_class->notify_key = meta_virtual_input_device_native_notify_key;
virtual_input_device_class->notify_keyval = meta_virtual_input_device_native_notify_keyval;
virtual_input_device_class->notify_discrete_scroll = meta_virtual_input_device_native_notify_discrete_scroll;
virtual_input_device_class->notify_scroll_continuous = meta_virtual_input_device_native_notify_scroll_continuous;
virtual_input_device_class->notify_touch_down = meta_virtual_input_device_native_notify_touch_down;
virtual_input_device_class->notify_touch_motion = meta_virtual_input_device_native_notify_touch_motion;
virtual_input_device_class->notify_touch_up = meta_virtual_input_device_native_notify_touch_up;
obj_props[PROP_SEAT] = g_param_spec_pointer ("seat",
"Seat",
"Seat",
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_properties (object_class, PROP_LAST, obj_props);
}