1 /* GDK - The GIMP Drawing Kit
2 * Copyright (C) 2009 Carlos Garnacho <carlosg@gnome.org>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 #include "gdkdevicemanager.h"
23 #include "gdkinternals.h"
27 * SECTION:gdkdevicemanager
28 * @Short_description: Functions for handling input devices
29 * @Long_description: In addition to a single pointer and keyboard for user interface input, GDK
30 * contains support for a variety of input devices, including graphics tablets,
31 * touchscreens and multiple pointers/keyboards interacting simultaneously with
32 * the user interface. Under X, the support for multiple input devices is done
33 * through the <firstterm>XInput 2</firstterm> extension, which also supports
34 * additional features such as sub-pixel positioning information and additional
35 * device-dependent information.
36 * @Title: GdkDeviceManager
37 * @See_also: #GdkDevice, #GdkEvent, gdk_enable_multidevice()
39 * By default, GDK supports the traditional single keyboard/pointer input scheme (Plus additional
40 * special input devices such as tablets. In short, backwards compatible with 2.X). Since version 3.0,
41 * if gdk_enable_multidevice() is called before gdk_display_open() and the platform supports it, GDK
42 * will be aware of multiple keyboard/pointer pairs interacting simultaneously with the user interface.
44 * Conceptually, in multidevice mode there are 2 device types, virtual devices (or master devices)
45 * are represented by the pointer cursors and keyboard foci that are seen on the screen. physical
46 * devices (or slave devices) represent the hardware that is controlling the virtual devices, and
47 * thus has no visible cursor on the screen.
49 * Virtual devices are always paired, there is a keyboard device for every pointer device,
50 * associations between devices may be inspected through gdk_device_get_associated_device().
52 * There may be several virtual devices, and several physical devices could be controlling each of
53 * these virtual devices. Physical devices may also be "floating", which means they are not attached
54 * to any virtual device.
56 * By default, GDK will automatically listen for events coming from all master devices, setting the
57 * #GdkDevice for all events coming from input devices
59 * Events containing device information are #GDK_MOTION_NOTIFY, #GDK_BUTTON_PRESS, #GDK_2BUTTON_PRESS,
60 * #GDK_3BUTTON_PRESS, #GDK_BUTTON_RELEASE, #GDK_SCROLL, #GDK_KEY_PRESS, #GDK_KEY_RELEASE,
61 * #GDK_ENTER_NOTIFY, #GDK_LEAVE_NOTIFY, #GDK_FOCUS_CHANGE, #GDK_PROXIMITY_IN, #GDK_PROXIMITY_OUT,
62 * #GDK_DRAG_ENTER, #GDK_DRAG_LEAVE, #GDK_DRAG_MOTION, #GDK_DRAG_STATUS, #GDK_DROP_START,
63 * #GDK_DROP_FINISHED and #GDK_GRAB_BROKEN.
65 * , although gdk_window_set_support_multidevice() has to be called on #GdkWindow<!-- --> in order to
66 * support additional features of multiple pointer interaction, such as multiple, per-device enter/leave
67 * events. The default setting will emit just one enter/leave event pair for all devices on the window.
68 * See gdk_window_set_support_multidevice() documentation for more information.
70 * In order to listen for events coming from other than a virtual device, gdk_window_set_device_events()
71 * must be called. Generally, this function can be used to modify the event mask for any given device.
73 * Input devices may also provide additional information besides X/Y. For example, graphics tablets may
74 * also provide pressure and X/Y tilt information. This information is device-dependent, and may be
75 * queried through gdk_device_get_axis(). In multidevice mode, virtual devices will change axes in order
76 * to always represent the physical device that is routing events through it. Whenever the physical device
77 * changes, the #GdkDevice:n-axes property will be notified, and gdk_device_list_axes() will return the
80 * Devices may also have associated <firstterm>keys</firstterm> or macro buttons. Such keys can be
81 * globally set to map into normal X keyboard events. The mapping is set using gdk_device_set_key().
83 * In order to query the device hierarchy and be aware of changes in the device hierarchy (such as
84 * virtual devices being created or removed, or physical devices being plugged or unplugged), GDK
85 * provides #GdkDeviceManager. On X11, multidevice support is implemented through XInput 2. If
86 * gdk_enable_multidevice() is called, the XInput 2.x #GdkDeviceManager implementation will be used
87 * as input source, else either the core or XInput 1.x implementations will be used.
90 static void gdk_device_manager_set_property (GObject *object,
94 static void gdk_device_manager_get_property (GObject *object,
100 G_DEFINE_ABSTRACT_TYPE (GdkDeviceManager, gdk_device_manager, G_TYPE_OBJECT)
114 static guint signals [LAST_SIGNAL] = { 0 };
117 struct _GdkDeviceManagerPrivate
124 gdk_device_manager_class_init (GdkDeviceManagerClass *klass)
126 GObjectClass *object_class = G_OBJECT_CLASS (klass);
128 object_class->set_property = gdk_device_manager_set_property;
129 object_class->get_property = gdk_device_manager_get_property;
131 g_object_class_install_property (object_class,
133 g_param_spec_object ("display",
135 P_("Display for the device manager"),
137 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
138 G_PARAM_STATIC_STRINGS));
141 * GdkDeviceManager::device-added:
142 * @device_manager: the object on which the signal is emitted
143 * @device: the newly added #GdkDevice.
145 * The ::device-added signal is emitted either when a new master
146 * pointer is created, or when a slave (Hardware) input device
149 signals [DEVICE_ADDED] =
150 g_signal_new (g_intern_static_string ("device-added"),
151 G_TYPE_FROM_CLASS (klass),
153 G_STRUCT_OFFSET (GdkDeviceManagerClass, device_added),
155 g_cclosure_marshal_VOID__OBJECT,
160 * GdkDeviceManager::device-removed:
161 * @device_manager: the object on which the signal is emitted
162 * @device: the just removed #GdkDevice.
164 * The ::device-removed signal is emitted either when a master
165 * pointer is removed, or when a slave (Hardware) input device
168 signals [DEVICE_REMOVED] =
169 g_signal_new (g_intern_static_string ("device-removed"),
170 G_TYPE_FROM_CLASS (klass),
172 G_STRUCT_OFFSET (GdkDeviceManagerClass, device_removed),
174 g_cclosure_marshal_VOID__OBJECT,
179 * GdkDeviceManager::device-changed:
180 * @device_manager: the object on which the signal is emitted
181 * @device: the #GdkDevice that changed.
183 * The ::device-changed signal is emitted either when some
184 * #GdkDevice has changed the number of either axes or keys.
185 * For example In X this will normally happen when the slave
186 * device routing events through the master device changes,
187 * in that case the master device will change to reflect the
188 * new slave device axes and keys.
190 signals [DEVICE_CHANGED] =
191 g_signal_new (g_intern_static_string ("device-changed"),
192 G_TYPE_FROM_CLASS (klass),
194 G_STRUCT_OFFSET (GdkDeviceManagerClass, device_changed),
196 g_cclosure_marshal_VOID__OBJECT,
200 g_type_class_add_private (object_class, sizeof (GdkDeviceManagerPrivate));
204 gdk_device_manager_init (GdkDeviceManager *device_manager)
206 GdkDeviceManagerPrivate *priv;
208 device_manager->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (device_manager,
209 GDK_TYPE_DEVICE_MANAGER,
210 GdkDeviceManagerPrivate);
214 gdk_device_manager_set_property (GObject *object,
219 GdkDeviceManagerPrivate *priv;
221 priv = GDK_DEVICE_MANAGER (object)->priv;
226 priv->display = g_value_get_object (value);
229 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
235 gdk_device_manager_get_property (GObject *object,
240 GdkDeviceManagerPrivate *priv;
242 priv = GDK_DEVICE_MANAGER (object)->priv;
247 g_value_set_object (value, priv->display);
250 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
256 * gdk_device_manager_get_display:
257 * @device_manager: a #GdkDeviceManager
259 * Gets the #GdkDisplay associated to @device_manager.
261 * Returns: the #GdkDisplay to which @device_manager is
262 * associated to, or #NULL.
267 gdk_device_manager_get_display (GdkDeviceManager *device_manager)
269 GdkDeviceManagerPrivate *priv;
271 g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
273 priv = device_manager->priv;
275 return priv->display;
279 * gdk_device_manager_list_devices:
280 * @device_manager: a #GdkDeviceManager
281 * @type: device type to get.
283 * Returns the list of devices of type @type currently attached to
286 * Returns: a list of #GdkDevice<!-- -->s. The returned list must be
287 * freed with g_list_free (). The list elements are owned by
288 * GTK+ and must not be freed or unreffed.
293 gdk_device_manager_list_devices (GdkDeviceManager *device_manager,
296 g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
298 return GDK_DEVICE_MANAGER_GET_CLASS (device_manager)->list_devices (device_manager, type);
302 * gdk_device_manager_get_client_pointer:
303 * @device_manager: a #GdkDeviceManager
305 * Returns the client pointer, that is, the master pointer that acts as the core pointer
306 * for this application. In X11, window managers may change this depending on the interaction
307 * pattern under the presence of several pointers.
309 * You should use this function sheldomly, only in code that isn't triggered by a #GdkEvent
310 * and there aren't other means to get a meaningful #GdkDevice to operate on.
312 * Returns: The client pointer.
317 gdk_device_manager_get_client_pointer (GdkDeviceManager *device_manager)
319 g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
321 return GDK_DEVICE_MANAGER_GET_CLASS (device_manager)->get_client_pointer (device_manager);
325 #define __GDK_DEVICE_MANAGER_C__
326 #include "gdkaliasdef.c"