add_key_watcher

Description:

public void add_key_watcher (owned KeyCallback? callback)

Add a callback that will receive a notification whenever a key is pressed or released.

Note:

Connect to the key-pressed and key-released signals instead of using this function.

this	the device.
callback	the function to call when the given key is pressed.
callback_destroyed	callback function to be called when `callback` is destroyed.
user_data	Data to be passed to `callback`.