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100 lines
2.7 KiB
100 lines
2.7 KiB
2 years ago
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# coding=utf-8
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# pynput
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# Copyright (C) 2015-2022 Moses Palmér
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#
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# This program is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 3 of the License, or (at your option) any
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# later version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Utility functions and classes for the *uinput* backend.
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"""
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# pylint: disable=R0903
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# We implement stubs
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import evdev
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# Check that we have permissions to continue
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def _check():
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# TODO: Implement!
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pass
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_check()
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del _check
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class ListenerMixin(object):
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"""A mixin for *uinput* event listeners.
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Subclasses should set a value for :attr:`_EVENTS` and implement
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:meth:`_handle`.
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"""
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#: The events for which to listen
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_EVENTS = tuple()
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def __init__(self, *args, **kwargs):
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super(ListenerMixin, self).__init__(*args, **kwargs)
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self._dev = self._device(self._options.get(
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'device_paths',
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evdev.list_devices()))
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if self.suppress:
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self._dev.grab()
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def _run(self):
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for event in self._dev.read_loop():
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if event.type in self._EVENTS:
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self._handle(event)
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def _stop_platform(self):
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self._dev.close()
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def _device(self, paths):
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"""Attempts to load a readable keyboard device.
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:param paths: A list of paths.
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:return: a compatible device
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"""
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dev, count = None, 0
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for path in paths:
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# Open the device
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try:
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next_dev = evdev.InputDevice(path)
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except OSError:
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continue
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# Does this device provide more handled event codes?
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capabilities = next_dev.capabilities()
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next_count = sum(
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len(codes)
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for event, codes in capabilities.items()
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if event in self._EVENTS)
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if next_count > count:
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dev = next_dev
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count = next_count
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else:
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next_dev.close()
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if dev is None:
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raise OSError('no keyboard device available')
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else:
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return dev
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def _handle(self, event):
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"""Handles a single event.
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This method should call one of the registered event callbacks.
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:param event: The event.
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"""
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raise NotImplementedError()
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