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. Such input devices often have additional features, such as sub-pixel positioning information and additional device-dependent information.
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 Gdk.Device_Manager.Gdk_Device_Manager.
By default, and if the platform supports it, GDK is aware of multiple keyboard/pointer pairs and multitouch devices. This behavior can be changed by calling gdk_disable_multidevice before Gdk.Display.Open. There should rarely be a need to do that though, since GDK defaults to a compatibility mode in which it will emit just one enter/leave event pair for all devices on a window. To enable per-device enter/leave events and other multi-pointer interaction features, Gdk.Window.Set_Support_Multidevice must be called on Gdk_Windows (or Gtk.Widget.Set_Support_Multidevice on widgets). window. See the Gdk.Window.Set_Support_Multidevice documentation for more information.
On X11, multi-device support is implemented through XInput 2. Unless gdk_disable_multidevice is called, the XInput 2 Gdk.Device_Manager.Gdk_Device_Manager implementation will be used as the input source. Otherwise either the core or XInput 1 implementations will be used.
For simple applications that don't have any special interest in input devices, the so-called "client pointer" provides a reasonable approximation to a simple setup with a single pointer and keyboard. The device that has been set as the client pointer can be accessed via Gdk.Device_Manager.Get_Client_Pointer.
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 have no visible cursor on the screen.
Virtual devices are always paired, so 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.
# Master and slave devices
carlosSacarino:~$ xinput list
â¡ Virtual core pointer id=2 [master pointer (3)]
â â³ Virtual core XTEST pointer id=4 [slave pointer (2)]
â â³ Wacom ISDv4 E6 Pen stylus id=10 [slave pointer (2)]
â â³ Wacom ISDv4 E6 Finger touch id=11 [slave pointer (2)]
â â³ SynPS/2 Synaptics TouchPad id=13 [slave pointer (2)]
â â³ TPPS/2 IBM TrackPoint id=14 [slave pointer (2)]
â â³ Wacom ISDv4 E6 Pen eraser id=16 [slave pointer (2)]
⣠Virtual core keyboard id=3 [master keyboard (2)]
â³ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
â³ Power Button id=6 [slave keyboard (3)]
â³ Video Bus id=7 [slave keyboard (3)]
â³ Sleep Button id=8 [slave keyboard (3)]
â³ Integrated Camera id=9 [slave keyboard (3)]
â³ AT Translated Set 2 keyboard id=12 [slave keyboard (3)]
â³ ThinkPad Extra Buttons id=15 [slave keyboard (3)]
By default, GDK will automatically listen for events coming from all master devices, setting the Gdk.Device.Gdk_Device for all events coming from input devices. Events containing device information are GDK_MOTION_NOTIFY, GDK_BUTTON_PRESS, GDK_2_BUTTON_PRESS, GDK_3_BUTTON_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. When dealing with an event on a master device, it is possible to get the source (slave) device that the event originated from via gdk_event_get_source_device.
On a standard session, all physical devices are connected by default to the "Virtual Core Pointer/Keyboard" master devices, hence routing all events through these. This behavior is only modified by device grabs, where the slave device is temporarily detached for as long as the grab is held, and more permanently by user modifications to the device hierarchy.
On certain application specific setups, it may make sense to detach a physical device from its master pointer, and mapping it to an specific window. This can be achieved by the combination of Gdk.Device.Grab and Gdk.Device.Set_Mode.
In order to listen for events coming from devices 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 Gdk.Device.Gdk_Device:n-axes property will be notified, and gdk_device_list_axes will return the new device axes.
Devices may also have associated "keys" 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 GTK+ 3.20, a new Gdk.Seat.Gdk_Seat object has been introduced that supersedes Gdk.Device_Manager.Gdk_Device_Manager and should be preferred in newly written code.
Display_Property : constant Glib.Properties.Property_Boxed;
Type: Display
type Gdk_Device_Manager is access all Gdk_Device_Manager_Record'Class;
type Gdk_Device_Manager_Record is new GObject_Record with null record;
function Get_Client_Pointer
(Self : not null access Gdk_Device_Manager_Record)
return Gdk.Device.Gdk_Device
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 seldomly, only in code that isn't triggered by a Gdk.Event.Gdk_Event and there aren't other means to get a meaningful Gdk.Device.Gdk_Device to operate on. Since: gtk+ 3.0 Deprecated since 3.20, 1
The client pointer. This memory is owned by GDK and must not be freed or unreferenced.
function Get_Device_Manager
(Self : not null access Gdk.Display.Gdk_Display_Record'Class)
return Gdk.Device_Manager.Gdk_Device_Manager
Returns the Gdk.Device_Manager.Gdk_Device_Manager associated to Display. Since: gtk+ 3.0
function Get_Display
(Self : not null access Gdk_Device_Manager_Record)
return Gdk.Display.Gdk_Display
Gets the Gdk.Display.Gdk_Display associated to Device_Manager. Since: gtk+ 3.0
the Gdk.Display.Gdk_Display to which Device_Manager is associated to, or null. This memory is owned by GDK and must not be freed or unreferenced.
function Get_Type return Glib.GType
function List_Devices
(Self : not null access Gdk_Device_Manager_Record;
The_Type : Gdk.Device.Gdk_Device_Type)
return Gdk.Device.Device_List.Glist
Returns the list of devices of type Type currently attached to Device_Manager. Since: gtk+ 3.0 Deprecated since 3.20, 1
device type to get.
Signal_Device_Added : constant Glib.Signal_Name := "device-added";
The ::device-added signal is emitted either when a new master pointer is created, or when a slave (Hardware) input device is plugged in. procedure Handler (Self : access Gdk_Device_Manager_Record'Class; Device : Device)
Signal_Device_Changed : constant Glib.Signal_Name := "device-changed";
The ::device-changed signal is emitted whenever a device has changed in the hierarchy, either slave devices being disconnected from their master device or connected to another one, or master devices being added or removed a slave device.
If a slave device is detached from all master devices (gdk_device_get_associated_device returns null), its Gdk.Device.Gdk_Device_Type will change to Gdk.Device.Gdk_Device_Type_Floating, if it's attached, it will change to Gdk.Device.Gdk_Device_Type_Slave. procedure Handler (Self : access Gdk_Device_Manager_Record'Class; Device : Device)
Signal_Device_Removed : constant Glib.Signal_Name := "device-removed";
The ::device-removed signal is emitted either when a master pointer is removed, or when a slave (Hardware) input device is unplugged. procedure Handler (Self : access Gdk_Device_Manager_Record'Class; Device : Device)