gtk2/gdk/gdkdevicemanager.c

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 2009 Carlos Garnacho <carlosg@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
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#include "gdkdevicemanager.h"
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#include "gdkintl.h"
#include "gdkinternals.h"
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/**
* SECTION:gdkdevicemanager
* @Short_description: Functions for handling input devices
* @Long_description: In addition to a single pointer and keyboard for user interface input, GDK
* contains support for a variety of input devices, including graphics tablets,
* touchscreens and multiple pointers/keyboards interacting simultaneously with
* the user interface. Under X, the support for multiple input devices is done
* through the <firstterm>XInput 2</firstterm> extension, which also supports
* additional features such as sub-pixel positioning information and additional
* device-dependent information.
* @Title: GdkDeviceManager
* @See_also: #GdkDevice, #GdkEvent, gdk_enable_multidevice()
*
* By default, GDK supports the traditional single keyboard/pointer input scheme (Plus additional
* special input devices such as tablets. In short, backwards compatible with 2.X). Since version 3.0,
* if gdk_enable_multidevice() is called before gdk_display_open() and the platform supports it, GDK
* will be aware of multiple keyboard/pointer pairs interacting simultaneously with the user interface.
*
* Conceptually, in multidevice mode there are 2 device types, virtual devices (or master devices)
* are represented by the pointer cursors and keyboard foci that are seen on the screen. physical
* devices (or slave devices) represent the hardware that is controlling the virtual devices, and
* thus has no visible cursor on the screen.
*
* Virtual devices are always paired, there is a keyboard device for every pointer device,
* associations between devices may be inspected through gdk_device_get_associated_device().
*
* There may be several virtual devices, and several physical devices could be controlling each of
* these virtual devices. Physical devices may also be "floating", which means they are not attached
* to any virtual device.
*
* By default, GDK will automatically listen for events coming from all master devices, setting the
* #GdkDevice for all events coming from input devices
* <footnote>
* Events containing device information are #GDK_MOTION_NOTIFY, #GDK_BUTTON_PRESS, #GDK_2BUTTON_PRESS,
* #GDK_3BUTTON_PRESS, #GDK_BUTTON_RELEASE, #GDK_SCROLL, #GDK_KEY_PRESS, #GDK_KEY_RELEASE,
* #GDK_ENTER_NOTIFY, #GDK_LEAVE_NOTIFY, #GDK_FOCUS_CHANGE, #GDK_PROXIMITY_IN, #GDK_PROXIMITY_OUT,
* #GDK_DRAG_ENTER, #GDK_DRAG_LEAVE, #GDK_DRAG_MOTION, #GDK_DRAG_STATUS, #GDK_DROP_START,
* #GDK_DROP_FINISHED and #GDK_GRAB_BROKEN.
* </footnote>
* , although gdk_window_set_support_multidevice() has to be called on #GdkWindow<!-- --> in order to
* support additional features of multiple pointer interaction, such as multiple, per-device enter/leave
* events. The default setting will emit just one enter/leave event pair for all devices on the window.
* See gdk_window_set_support_multidevice() documentation for more information.
*
* In order to listen for events coming from other than a virtual device, gdk_window_set_device_events()
* must be called. Generally, this function can be used to modify the event mask for any given device.
*
* Input devices may also provide additional information besides X/Y. For example, graphics tablets may
* also provide pressure and X/Y tilt information. This information is device-dependent, and may be
* queried through gdk_device_get_axis(). In multidevice mode, virtual devices will change axes in order
* to always represent the physical device that is routing events through it. Whenever the physical device
* changes, the #GdkDevice:n-axes property will be notified, and gdk_device_list_axes() will return the
* new device axes.
*
* Devices may also have associated <firstterm>keys</firstterm> or macro buttons. Such keys can be
* globally set to map into normal X keyboard events. The mapping is set using gdk_device_set_key().
*
* In order to query the device hierarchy and be aware of changes in the device hierarchy (such as
* virtual devices being created or removed, or physical devices being plugged or unplugged), GDK
* provides #GdkDeviceManager. On X11, multidevice support is implemented through XInput 2. If
* gdk_enable_multidevice() is called, the XInput 2.x #GdkDeviceManager implementation will be used
* as input source, else either the core or XInput 1.x implementations will be used.
*/
static void gdk_device_manager_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gdk_device_manager_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
G_DEFINE_ABSTRACT_TYPE (GdkDeviceManager, gdk_device_manager, G_TYPE_OBJECT)
enum {
PROP_0,
PROP_DISPLAY
};
enum {
DEVICE_ADDED,
DEVICE_REMOVED,
DEVICE_CHANGED,
LAST_SIGNAL
};
static guint signals [LAST_SIGNAL] = { 0 };
struct _GdkDeviceManagerPrivate
{
GdkDisplay *display;
};
static void
gdk_device_manager_class_init (GdkDeviceManagerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->set_property = gdk_device_manager_set_property;
object_class->get_property = gdk_device_manager_get_property;
g_object_class_install_property (object_class,
PROP_DISPLAY,
g_param_spec_object ("display",
P_("Display"),
P_("Display for the device manager"),
GDK_TYPE_DISPLAY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GdkDeviceManager::device-added:
* @device_manager: the object on which the signal is emitted
* @device: the newly added #GdkDevice.
*
* The ::device-added signal is emitted either when a new master
* pointer is created, or when a slave (Hardware) input device
* is plugged in.
*/
signals [DEVICE_ADDED] =
g_signal_new (g_intern_static_string ("device-added"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkDeviceManagerClass, device_added),
NULL, NULL,
g_cclosure_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
GDK_TYPE_DEVICE);
/**
* GdkDeviceManager::device-removed:
* @device_manager: the object on which the signal is emitted
* @device: the just removed #GdkDevice.
*
* The ::device-removed signal is emitted either when a master
* pointer is removed, or when a slave (Hardware) input device
* is unplugged.
*/
signals [DEVICE_REMOVED] =
g_signal_new (g_intern_static_string ("device-removed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkDeviceManagerClass, device_removed),
NULL, NULL,
g_cclosure_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
GDK_TYPE_DEVICE);
/**
* GdkDeviceManager::device-changed:
* @device_manager: the object on which the signal is emitted
* @device: the #GdkDevice that changed.
*
* The ::device-changed signal is emitted either when some
* #GdkDevice has changed the number of either axes or keys.
* For example In X this will normally happen when the slave
* device routing events through the master device changes,
* in that case the master device will change to reflect the
* new slave device axes and keys.
*/
signals [DEVICE_CHANGED] =
g_signal_new (g_intern_static_string ("device-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkDeviceManagerClass, device_changed),
NULL, NULL,
g_cclosure_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
GDK_TYPE_DEVICE);
g_type_class_add_private (object_class, sizeof (GdkDeviceManagerPrivate));
}
static void
gdk_device_manager_init (GdkDeviceManager *device_manager)
{
GdkDeviceManagerPrivate *priv;
device_manager->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (device_manager,
GDK_TYPE_DEVICE_MANAGER,
GdkDeviceManagerPrivate);
}
static void
gdk_device_manager_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkDeviceManagerPrivate *priv;
priv = GDK_DEVICE_MANAGER (object)->priv;
switch (prop_id)
{
case PROP_DISPLAY:
priv->display = g_value_get_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_device_manager_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GdkDeviceManagerPrivate *priv;
priv = GDK_DEVICE_MANAGER (object)->priv;
switch (prop_id)
{
case PROP_DISPLAY:
g_value_set_object (value, priv->display);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gdk_device_manager_get_display:
* @device_manager: a #GdkDeviceManager
*
* Gets the #GdkDisplay associated to @device_manager.
*
* Returns: the #GdkDisplay to which @device_manager is
* associated to, or #NULL.
*
* Since: 3.0
**/
GdkDisplay *
gdk_device_manager_get_display (GdkDeviceManager *device_manager)
{
GdkDeviceManagerPrivate *priv;
g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
priv = device_manager->priv;
return priv->display;
}
/**
* gdk_device_manager_list_devices:
* @device_manager: a #GdkDeviceManager
* @type: device type to get.
*
* Returns the list of devices of type @type currently attached to
* @device_manager.
*
* Returns: (transfer container) (element-type Gdk.Device): a list of
* #GdkDevice<!-- -->s. The returned list must be
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* freed with g_list_free (). The list elements are owned by
* GTK+ and must not be freed or unreffed.
*
* Since: 3.0
**/
GList *
gdk_device_manager_list_devices (GdkDeviceManager *device_manager,
GdkDeviceType type)
{
g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
return GDK_DEVICE_MANAGER_GET_CLASS (device_manager)->list_devices (device_manager, type);
}
/**
* gdk_device_manager_get_client_pointer:
* @device_manager: a #GdkDeviceManager
*
* Returns the client pointer, that is, the master pointer that acts as the core pointer
* for this application. In X11, window managers may change this depending on the interaction
* pattern under the presence of several pointers.
*
* You should use this function sheldomly, only in code that isn't triggered by a #GdkEvent
* and there aren't other means to get a meaningful #GdkDevice to operate on.
*
* Returns: The client pointer.
*
* Since: 3.0
**/
GdkDevice *
gdk_device_manager_get_client_pointer (GdkDeviceManager *device_manager)
{
g_return_val_if_fail (GDK_IS_DEVICE_MANAGER (device_manager), NULL);
return GDK_DEVICE_MANAGER_GET_CLASS (device_manager)->get_client_pointer (device_manager);
}