GI.Gdk.Objects.DeviceManager

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 DeviceManager.

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 disableMultidevice before displayOpen. 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, windowSetSupportMultidevice must be called on GdkWindows (or gtk_widget_set_support_multidevice() on widgets). window. See the windowSetSupportMultidevice documentation for more information.

On X11, multi-device support is implemented through XInput 2. Unless disableMultidevice is called, the XInput 2 DeviceManager 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 deviceManagerGetClientPointer.

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 deviceGetAssociatedDevice.

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

carlos@sacarino:~$ xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ Wacom ISDv4 E6 Pen stylus                 id=10   [slave  pointer  (2)]
⎜   ↳ Wacom ISDv4 E6 Finger touch               id=11   [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=13   [slave  pointer  (2)]
⎜   ↳ TPPS/2 IBM TrackPoint                     id=14   [slave  pointer  (2)]
⎜   ↳ Wacom ISDv4 E6 Pen eraser                 id=16   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Sleep Button                              id=8    [slave  keyboard (3)]
    ↳ Integrated Camera                         id=9    [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=12   [slave  keyboard (3)]
    ↳ ThinkPad Extra Buttons                    id=15   [slave  keyboard (3)]

By default, GDK will automatically listen for events coming from all master devices, setting the Device for all events coming from input devices. 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. When dealing with an event on a master device, it is possible to get the source (slave) device that the event originated from via eventGetSourceDevice.

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 deviceGrab and deviceSetMode.

In order to listen for events coming from devices other than a virtual device, windowSetDeviceEvents 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 Device:n-axes property will be notified, and deviceListAxes 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 deviceSetKey.

In GTK+ 3.20, a new Seat object has been introduced that supersedes DeviceManager and should be preferred in newly written code.

Exported types

newtype DeviceManager

Memory-managed wrapper type.

Constructors

DeviceManager (ManagedPtr DeviceManager)

Instances

GObject DeviceManager

Defined in GI.Gdk.Objects.DeviceManager

Methods

gobjectType :: DeviceManager -> IO GType

IsObject DeviceManager

Defined in GI.Gdk.Objects.DeviceManager

IsDeviceManager DeviceManager

Defined in GI.Gdk.Objects.DeviceManager

class GObject o => IsDeviceManager o

Type class for types which can be safely cast to DeviceManager, for instance with toDeviceManager.

Instances

(GObject a, (UnknownAncestorError DeviceManager a :: Constraint)) => IsDeviceManager a

Defined in GI.Gdk.Objects.DeviceManager

IsDeviceManager DeviceManager

Defined in GI.Gdk.Objects.DeviceManager

toDeviceManager :: (MonadIO m, IsDeviceManager o) => o -> m DeviceManager

Cast to DeviceManager, for types for which this is known to be safe. For general casts, use castTo.

noDeviceManager :: Maybe DeviceManager

A convenience alias for Nothing :: Maybe DeviceManager.

Methods

getClientPointer

deviceManagerGetClientPointer

Arguments

:: (HasCallStack, MonadIO m, IsDeviceManager a)

=> a

deviceManager: a DeviceManager

-> m Device

Returns: The client pointer. This memory is owned by GDK and must not be freed or unreferenced.

Deprecated: (Since version 3.20)Use seatGetPointer instead.

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 Event and there aren’t other means to get a meaningful Device to operate on.

Since: 3.0

getDisplay

deviceManagerGetDisplay

Arguments

:: (HasCallStack, MonadIO m, IsDeviceManager a)

=> a

deviceManager: a DeviceManager

-> m (Maybe Display)

Returns: the Display to which deviceManager is associated to, or Nothing. This memory is owned by GDK and must not be freed or unreferenced.

Gets the Display associated to deviceManager.

Since: 3.0

listDevices

deviceManagerListDevices

Arguments

:: (HasCallStack, MonadIO m, IsDeviceManager a)

=> a

deviceManager: a DeviceManager

-> DeviceType

type: device type to get.

-> m [Device]

Returns: a list of GdkDevices. The returned list must be freed with g_list_free (). The list elements are owned by GTK+ and must not be freed or unreffed.

Deprecated: (Since version 3.20), use seatGetPointer, seatGetKeyboard and seatGetSlaves instead.

Returns the list of devices of type type currently attached to deviceManager.

Since: 3.0

Properties

display

No description available in the introspection data.

constructDeviceManagerDisplay :: (IsDeviceManager o, IsDisplay a) => a -> IO (GValueConstruct o)

Construct a GValueConstruct with valid value for the “display” property. This is rarely needed directly, but it is used by new.

getDeviceManagerDisplay :: (MonadIO m, IsDeviceManager o) => o -> m (Maybe Display)

Get the value of the “display” property. When overloading is enabled, this is equivalent to

get deviceManager #display

Signals

deviceAdded

type C_DeviceManagerDeviceAddedCallback = Ptr () -> Ptr Device -> Ptr () -> IO ()

Type for the callback on the (unwrapped) C side.

type DeviceManagerDeviceAddedCallback

Arguments

 = Device

device: the newly added Device.

-> IO ()

The ::device-added signal is emitted either when a new master pointer is created, or when a slave (Hardware) input device is plugged in.

afterDeviceManagerDeviceAdded :: (IsDeviceManager a, MonadIO m) => a -> DeviceManagerDeviceAddedCallback -> m SignalHandlerId

Connect a signal handler for the “device-added” signal, to be run after the default handler. When overloading is enabled, this is equivalent to

after deviceManager #deviceAdded callback

genClosure_DeviceManagerDeviceAdded :: DeviceManagerDeviceAddedCallback -> IO Closure

Wrap the callback into a Closure.

mk_DeviceManagerDeviceAddedCallback :: C_DeviceManagerDeviceAddedCallback -> IO (FunPtr C_DeviceManagerDeviceAddedCallback)

Generate a function pointer callable from C code, from a C_DeviceManagerDeviceAddedCallback.

noDeviceManagerDeviceAddedCallback :: Maybe DeviceManagerDeviceAddedCallback

A convenience synonym for Nothing :: Maybe DeviceManagerDeviceAddedCallback.

onDeviceManagerDeviceAdded :: (IsDeviceManager a, MonadIO m) => a -> DeviceManagerDeviceAddedCallback -> m SignalHandlerId

Connect a signal handler for the “device-added” signal, to be run before the default handler. When overloading is enabled, this is equivalent to

on deviceManager #deviceAdded callback

wrap_DeviceManagerDeviceAddedCallback :: DeviceManagerDeviceAddedCallback -> C_DeviceManagerDeviceAddedCallback

Wrap a DeviceManagerDeviceAddedCallback into a C_DeviceManagerDeviceAddedCallback.

deviceChanged

type C_DeviceManagerDeviceChangedCallback = Ptr () -> Ptr Device -> Ptr () -> IO ()

Type for the callback on the (unwrapped) C side.

type DeviceManagerDeviceChangedCallback

Arguments

 = Device

device: the Device that changed.

-> IO ()

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 (deviceGetAssociatedDevice returns Nothing), its DeviceType will change to DeviceTypeFloating, if it's attached, it will change to DeviceTypeSlave.

afterDeviceManagerDeviceChanged :: (IsDeviceManager a, MonadIO m) => a -> DeviceManagerDeviceChangedCallback -> m SignalHandlerId

Connect a signal handler for the “device-changed” signal, to be run after the default handler. When overloading is enabled, this is equivalent to

after deviceManager #deviceChanged callback

genClosure_DeviceManagerDeviceChanged :: DeviceManagerDeviceChangedCallback -> IO Closure

Wrap the callback into a Closure.

mk_DeviceManagerDeviceChangedCallback :: C_DeviceManagerDeviceChangedCallback -> IO (FunPtr C_DeviceManagerDeviceChangedCallback)

Generate a function pointer callable from C code, from a C_DeviceManagerDeviceChangedCallback.

noDeviceManagerDeviceChangedCallback :: Maybe DeviceManagerDeviceChangedCallback

A convenience synonym for Nothing :: Maybe DeviceManagerDeviceChangedCallback.

onDeviceManagerDeviceChanged :: (IsDeviceManager a, MonadIO m) => a -> DeviceManagerDeviceChangedCallback -> m SignalHandlerId

Connect a signal handler for the “device-changed” signal, to be run before the default handler. When overloading is enabled, this is equivalent to

on deviceManager #deviceChanged callback

wrap_DeviceManagerDeviceChangedCallback :: DeviceManagerDeviceChangedCallback -> C_DeviceManagerDeviceChangedCallback

Wrap a DeviceManagerDeviceChangedCallback into a C_DeviceManagerDeviceChangedCallback.

deviceRemoved

type C_DeviceManagerDeviceRemovedCallback = Ptr () -> Ptr Device -> Ptr () -> IO ()

Type for the callback on the (unwrapped) C side.

type DeviceManagerDeviceRemovedCallback

Arguments

 = Device

device: the just removed Device.

-> IO ()

The ::device-removed signal is emitted either when a master pointer is removed, or when a slave (Hardware) input device is unplugged.

afterDeviceManagerDeviceRemoved :: (IsDeviceManager a, MonadIO m) => a -> DeviceManagerDeviceRemovedCallback -> m SignalHandlerId

Connect a signal handler for the “device-removed” signal, to be run after the default handler. When overloading is enabled, this is equivalent to

after deviceManager #deviceRemoved callback

genClosure_DeviceManagerDeviceRemoved :: DeviceManagerDeviceRemovedCallback -> IO Closure

Wrap the callback into a Closure.

mk_DeviceManagerDeviceRemovedCallback :: C_DeviceManagerDeviceRemovedCallback -> IO (FunPtr C_DeviceManagerDeviceRemovedCallback)

Generate a function pointer callable from C code, from a C_DeviceManagerDeviceRemovedCallback.

noDeviceManagerDeviceRemovedCallback :: Maybe DeviceManagerDeviceRemovedCallback

A convenience synonym for Nothing :: Maybe DeviceManagerDeviceRemovedCallback.

onDeviceManagerDeviceRemoved :: (IsDeviceManager a, MonadIO m) => a -> DeviceManagerDeviceRemovedCallback -> m SignalHandlerId

Connect a signal handler for the “device-removed” signal, to be run before the default handler. When overloading is enabled, this is equivalent to

on deviceManager #deviceRemoved callback

wrap_DeviceManagerDeviceRemovedCallback :: DeviceManagerDeviceRemovedCallback -> C_DeviceManagerDeviceRemovedCallback

Wrap a DeviceManagerDeviceRemovedCallback into a C_DeviceManagerDeviceRemovedCallback.