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110 lines
3.2 KiB
Python
110 lines
3.2 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# key-mapper - GUI for device specific keyboard mappings
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# Copyright (C) 2020 sezanzeb <proxima@hip70890b.de>
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#
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# This file is part of key-mapper.
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#
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# key-mapper is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# key-mapper is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with key-mapper. If not, see <https://www.gnu.org/licenses/>.
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"""Contains and manages mappings."""
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from keymapper.logger import logger
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class Mapping:
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"""Contains and manages mappings.
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The keycode is always unique, multiple keycodes may map to the same
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character.
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"""
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def __init__(self):
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self._mapping = {}
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self.changed = False
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def __iter__(self):
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"""Iterate over tuples of unique keycodes and their character."""
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return iter(sorted(self._mapping.items()))
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def __len__(self):
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return len(self._mapping)
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def change(self, previous_keycode, new_keycode, character):
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"""Replace the mapping of a keycode with a different one.
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Return True on success.
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Parameters
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----------
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previous_keycode : int or None
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If None, will not remove any previous mapping.
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new_keycode : int
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character : string
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"""
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try:
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new_keycode = int(new_keycode)
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except ValueError:
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logger.error('Cannot use %s as keycode', new_keycode)
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return False
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if previous_keycode is not None:
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try:
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previous_keycode = int(previous_keycode)
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except ValueError:
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logger.error('Cannot use %s as keycode', previous_keycode)
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return False
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if new_keycode and character:
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self._mapping[new_keycode] = str(character)
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if new_keycode != previous_keycode:
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# clear previous mapping of that code, because the line
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# representing that one will now represent a different one.
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self.clear(previous_keycode)
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self.changed = True
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return True
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return False
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def clear(self, keycode):
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"""Remove a keycode from the mapping.
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Parameters
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----------
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keycode : int
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"""
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if self._mapping.get(keycode) is not None:
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del self._mapping[keycode]
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self.changed = True
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def empty(self):
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"""Remove all mappings."""
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self._mapping = {}
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self.changed = True
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def get(self, keycode):
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"""Read the character that is mapped to this keycode.
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Parameters
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----------
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keycode : int
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"""
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return self._mapping.get(keycode)
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# one mapping object for the whole application that holds all
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# customizations
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custom_mapping = Mapping()
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