An input_device describes the device that generated an event (see
event<-device).
Events from the mouse refer to @mouse_device and keyboard
events to @keyboard_device. Pens, touch screens and
gamepads are represented by their own input_device, which is created
when the window system reports the device. The same physical device is
always represented by the same object. display<-input_devices
lists the known devices.
Applications normally only inspect devices, e.g.,
to distinguish pen input from mouse input:
get(@event, device, Device),
get(Device, kind, pen)
Devices that can be polled have their own subclass: @keyboard_device
is a keyboard and gamepads are of class gamepad.
- See also
- - event
<-device
- class keyboard
- class gamepad
- display<-input_devices
- class event_detail
- input_device <-
kind: {mouse,pen,touch,gamepad,keyboard}
- The kind of device.
- input_device <-
id: int
- Identifier of the device in the window system. This is 0 for
@mouse_device and @keyboard_device.
- input_device <-
name: name
- Human readable name of the device. If the window system does not provide
a name, this is the input_device
<-kind.
- input_device ->initialise: kind={mouse,pen,touch,gamepad,keyboard},
id=[int], name=[name]
- Create a device description. Devices are normally created by xpce.
Creating one is only useful to create events for testing. Such a device
is not added to display
<-input_devices.
