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GdkDeviceManager: Add gdk_device_manager_get_client_pointer().
[~andy/gtk] / gdk / gdkdevicemanager.c
1 /* GDK - The GIMP Drawing Kit
2  * Copyright (C) 2009 Carlos Garnacho <carlosg@gnome.org>
3  *
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.
8  *
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.
13  *
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.
18  */
19
20 #include "config.h"
21 #include "gdkdevicemanager.h"
22 #include "gdkintl.h"
23 #include "gdkinternals.h"
24 #include "gdkalias.h"
25
26 /**
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()
38  *
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.
43  *
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.
48  *
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().
51  *
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.
55  *
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
58  * <footnote>
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.
64  * </footnote>
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.
69  *
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.
72  *
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
78  * new device axes.
79  *
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().
82  *
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.
88  */
89
90 static void gdk_device_manager_set_property (GObject      *object,
91                                              guint         prop_id,
92                                              const GValue *value,
93                                              GParamSpec   *pspec);
94 static void gdk_device_manager_get_property (GObject      *object,
95                                              guint         prop_id,
96                                              GValue       *value,
97                                              GParamSpec   *pspec);
98
99
100 G_DEFINE_ABSTRACT_TYPE (GdkDeviceManager, gdk_device_manager, G_TYPE_OBJECT)
101
102 enum {
103   PROP_0,
104   PROP_DISPLAY
105 };
106
107 enum {
108   DEVICE_ADDED,
109   DEVICE_REMOVED,
110   DEVICE_CHANGED,
111   LAST_SIGNAL
112 };
113
114 static guint signals [LAST_SIGNAL] = { 0 };
115
116
117 struct _GdkDeviceManagerPrivate
118 {
119   GdkDisplay *display;
120 };
121
122
123 static void
124 gdk_device_manager_class_init (GdkDeviceManagerClass *klass)
125 {
126   GObjectClass *object_class = G_OBJECT_CLASS (klass);
127
128   object_class->set_property = gdk_device_manager_set_property;
129   object_class->get_property = gdk_device_manager_get_property;
130
131   g_object_class_install_property (object_class,
132                                    PROP_DISPLAY,
133                                    g_param_spec_object ("display",
134                                                         P_("Display"),
135                                                         P_("Display for the device manager"),
136                                                         GDK_TYPE_DISPLAY,
137                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
138                                                         G_PARAM_STATIC_STRINGS));
139
140   /**
141    * GdkDeviceManager::device-added:
142    * @device_manager: the object on which the signal is emitted
143    * @device: the newly added #GdkDevice.
144    *
145    * The ::device-added signal is emitted either when a new master
146    * pointer is created, or when a slave (Hardware) input device
147    * is plugged in.
148    */
149   signals [DEVICE_ADDED] =
150     g_signal_new (g_intern_static_string ("device-added"),
151                   G_TYPE_FROM_CLASS (klass),
152                   G_SIGNAL_RUN_LAST,
153                   G_STRUCT_OFFSET (GdkDeviceManagerClass, device_added),
154                   NULL, NULL,
155                   g_cclosure_marshal_VOID__OBJECT,
156                   G_TYPE_NONE, 1,
157                   GDK_TYPE_DEVICE);
158
159   /**
160    * GdkDeviceManager::device-removed:
161    * @device_manager: the object on which the signal is emitted
162    * @device: the just removed #GdkDevice.
163    *
164    * The ::device-removed signal is emitted either when a master
165    * pointer is removed, or when a slave (Hardware) input device
166    * is unplugged.
167    */
168   signals [DEVICE_REMOVED] =
169     g_signal_new (g_intern_static_string ("device-removed"),
170                   G_TYPE_FROM_CLASS (klass),
171                   G_SIGNAL_RUN_LAST,
172                   G_STRUCT_OFFSET (GdkDeviceManagerClass, device_removed),
173                   NULL, NULL,
174                   g_cclosure_marshal_VOID__OBJECT,
175                   G_TYPE_NONE, 1,
176                   GDK_TYPE_DEVICE);
177
178   /**
179    * GdkDeviceManager::device-changed:
180    * @device_manager: the object on which the signal is emitted
181    * @device: the #GdkDevice that changed.
182    *
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.
189    */
190   signals [DEVICE_CHANGED] =
191     g_signal_new (g_intern_static_string ("device-changed"),
192                   G_TYPE_FROM_CLASS (klass),
193                   G_SIGNAL_RUN_LAST,
194                   G_STRUCT_OFFSET (GdkDeviceManagerClass, device_changed),
195                   NULL, NULL,
196                   g_cclosure_marshal_VOID__OBJECT,
197                   G_TYPE_NONE, 1,
198                   GDK_TYPE_DEVICE);
199
200   g_type_class_add_private (object_class, sizeof (GdkDeviceManagerPrivate));
201 }
202
203 static void
204 gdk_device_manager_init (GdkDeviceManager *device_manager)
205 {
206   GdkDeviceManagerPrivate *priv;
207
208   device_manager->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (device_manager,
209                                                              GDK_TYPE_DEVICE_MANAGER,
210                                                              GdkDeviceManagerPrivate);
211 }
212
213 static void
214 gdk_device_manager_set_property (GObject      *object,
215                                  guint         prop_id,
216                                  const GValue *value,
217                                  GParamSpec   *pspec)
218 {
219   GdkDeviceManagerPrivate *priv;
220
221   priv = GDK_DEVICE_MANAGER (object)->priv;
222
223   switch (prop_id)
224     {
225     case PROP_DISPLAY:
226       priv->display = g_value_get_object (value);
227       break;
228     default:
229       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
230       break;
231     }
232 }
233
234 static void
235 gdk_device_manager_get_property (GObject      *object,
236                                  guint         prop_id,
237                                  GValue       *value,
238                                  GParamSpec   *pspec)
239 {
240   GdkDeviceManagerPrivate *priv;
241
242   priv = GDK_DEVICE_MANAGER (object)->priv;
243
244   switch (prop_id)
245     {
246     case PROP_DISPLAY:
247       g_value_set_object (value, priv->display);
248       break;
249     default:
250       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
251       break;
252     }
253 }
254
255 /**
256  * gdk_device_manager_get_display:
257  * @device_manager: a #GdkDeviceManager
258  *
259  * Gets the #GdkDisplay associated to @device_manager.
260  *
261  * Returns: the #GdkDisplay to which @device_manager is
262  *          associated to, or #NULL.
263  *
264  * Since: 3.0
265  **/
266 GdkDisplay *
267 gdk_device_manager_get_display (GdkDeviceManager *device_manager)
268 {
269   GdkDeviceManagerPrivate *priv;
270
271   g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
272
273   priv = device_manager->priv;
274
275   return priv->display;
276 }
277
278 /**
279  * gdk_device_manager_list_devices:
280  * @device_manager: a #GdkDeviceManager
281  * @type: device type to get.
282  *
283  * Returns the list of devices of type @type currently attached to
284  * @device_manager.
285  *
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.
289  *
290  * Since: 3.0
291  **/
292 GList *
293 gdk_device_manager_list_devices (GdkDeviceManager *device_manager,
294                                  GdkDeviceType     type)
295 {
296   g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
297
298   return GDK_DEVICE_MANAGER_GET_CLASS (device_manager)->list_devices (device_manager, type);
299 }
300
301 /**
302  * gdk_device_manager_get_client_pointer:
303  * @device_manager: a #GdkDeviceManager
304  *
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.
308  *
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.
311  *
312  * Returns: The client pointer.
313  *
314  * Since: 3.0
315  **/
316 GdkDevice *
317 gdk_device_manager_get_client_pointer (GdkDeviceManager *device_manager)
318 {
319   g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
320
321   return GDK_DEVICE_MANAGER_GET_CLASS (device_manager)->get_client_pointer (device_manager);
322 }
323
324
325 #define __GDK_DEVICE_MANAGER_C__
326 #include "gdkaliasdef.c"