c8fd0937b0
This reverts commit bf2c7831c8.
This was a bad idea as we need to access some of the main attributes
from commands via instance=...
252 lines
8.3 KiB
Python
252 lines
8.3 KiB
Python
# Copyright 2014 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser 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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# qutebrowser 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 qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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"""Mode manager singleton which handles the current keyboard mode.
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Module attributes:
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manager: The ModeManager instance.
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"""
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import logging
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from PyQt5.QtGui import QWindow
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from PyQt5.QtCore import pyqtSignal, pyqtSlot, QObject, QEvent
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from PyQt5.QtWidgets import QApplication
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import qutebrowser.config.config as config
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import qutebrowser.commands.utils as cmdutils
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import qutebrowser.utils.debug as debug
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def instance():
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"""Get the global modeman instance."""
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return QApplication.instance().modeman
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def enter(mode):
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"""Enter the mode 'mode'."""
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instance().enter(mode)
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def leave(mode):
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"""Leave the mode 'mode'."""
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instance().leave(mode)
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def maybe_leave(mode):
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"""Convenience method to leave 'mode' without exceptions."""
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try:
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instance().leave(mode)
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except ValueError:
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pass
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class ModeManager(QObject):
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"""Manager for keyboard modes.
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Attributes:
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mode: The current mode (readonly property).
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passthrough: A list of modes in which to pass through events.
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_handlers: A dictionary of modes and their handlers.
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_mode_stack: A list of the modes we're currently in, with the active
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one on the right.
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_forward_unbound_keys: If we should forward unbound keys.
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_releaseevents_to_pass: A list of keys where the keyPressEvent was
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passed through, so the release event should as
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well.
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Signals:
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entered: Emitted when a mode is entered.
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arg: Name of the entered mode.
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left: Emitted when a mode is left.
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arg: Name of the left mode.
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key_pressed: A key was pressed.
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"""
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entered = pyqtSignal(str)
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left = pyqtSignal(str)
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key_pressed = pyqtSignal('QKeyEvent')
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def __init__(self, parent=None):
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super().__init__(parent)
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self._handlers = {}
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self.passthrough = []
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self._mode_stack = []
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self._releaseevents_to_pass = []
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self._forward_unbound_keys = config.get('input',
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'forward-unbound-keys')
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@property
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def mode(self):
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"""Read-only property for the current mode."""
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if not self._mode_stack:
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return None
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return self._mode_stack[-1]
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def _eventFilter_keypress(self, event):
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"""Handle filtering of KeyPress events.
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Args:
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event: The KeyPress to examine.
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Return:
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True if event should be filtered, False otherwise.
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"""
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handler = self._handlers[self.mode]
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logging.debug("KeyPress, calling handler {}".format(handler))
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self.key_pressed.emit(event)
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handled = handler(event) if handler is not None else False
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if handled:
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filter_this = True
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elif self.mode in self.passthrough or self._forward_unbound_keys:
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filter_this = False
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else:
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filter_this = True
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if not filter_this:
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self._releaseevents_to_pass.append(event)
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logging.debug("handled: {}, forward-unbound-keys: {}, passthrough: {} "
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"--> filter: {}".format(handled,
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self._forward_unbound_keys,
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self.mode in self.passthrough,
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filter_this))
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return filter_this
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def _eventFilter_keyrelease(self, event):
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"""Handle filtering of KeyRelease events.
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Args:
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event: The KeyPress to examine.
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Return:
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True if event should be filtered, False otherwise.
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"""
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# handle like matching KeyPress
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if event in self._releaseevents_to_pass:
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# remove all occurences
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self._releaseevents_to_pass = [
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e for e in self._releaseevents_to_pass if e != event]
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filter_this = False
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else:
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filter_this = True
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logging.debug("KeyRelease --> filter: {}".format(filter_this))
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return filter_this
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def register(self, mode, handler, passthrough=False):
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"""Register a new mode.
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Args:
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mode: The name of the mode.
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handler: Handler for keyPressEvents.
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passthrough: Whether to pass keybindings in this mode through to
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the widgets.
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"""
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self._handlers[mode] = handler
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if passthrough:
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self.passthrough.append(mode)
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@cmdutils.register(instance='modeman', name='enter_mode', hide=True)
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def enter(self, mode):
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"""Enter a new mode.
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Args:
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mode; The name of the mode to enter.
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Emit:
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entered: With the new mode name.
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"""
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logging.debug("Switching mode to {}".format(mode))
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if mode not in self._handlers:
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raise ValueError("No handler for mode {}".format(mode))
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if self._mode_stack and self._mode_stack[-1] == mode:
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logging.debug("Already at end of stack, doing nothing")
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return
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self._mode_stack.append(mode)
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logging.debug("New mode stack: {}".format(self._mode_stack))
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self.entered.emit(mode)
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def leave(self, mode):
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"""Leave a mode.
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Args:
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mode; The name of the mode to leave.
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Emit:
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left: With the old mode name.
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"""
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try:
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self._mode_stack.remove(mode)
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except ValueError:
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raise ValueError("Mode {} not on mode stack!".format(mode))
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logging.debug("Leaving mode {}".format(mode))
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logging.debug("New mode stack: {}".format(self._mode_stack))
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self.left.emit(mode)
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@cmdutils.register(instance='modeman', name='leave_mode',
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not_modes=['normal'], hide=True)
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def leave_current_mode(self):
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"""Leave the mode we're currently in."""
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if self.mode == 'normal':
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raise ValueError("Can't leave normal mode!")
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self.leave(self.mode)
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@pyqtSlot(str, str)
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def on_config_changed(self, section, option):
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"""Update local setting when config changed."""
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if (section, option) == ('input', 'forward-unbound-keys'):
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self._forward_unbound_keys = config.get('input',
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'forward-unbound-keys')
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def eventFilter(self, obj, event):
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"""Filter all events based on the currently set mode.
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Also calls the real keypress handler.
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Args:
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event: The KeyPress to examine.
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Return:
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True if event should be filtered, False otherwise.
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Emit:
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key_pressed: When a key was actually pressed.
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"""
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if self.mode is None:
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# We got events before mode is set, so just pass them through.
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return False
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typ = event.type()
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if typ not in [QEvent.KeyPress, QEvent.KeyRelease]:
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# We're not interested in non-key-events so we pass them through.
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return False
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if not isinstance(obj, QWindow):
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# We already handled this same event at some point earlier, so
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# we're not interested in it anymore.
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logging.debug("Ignoring event {} for {}".format(
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debug.EVENTS[typ], obj.__class__.__name__))
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return False
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logging.debug("Got event {} for {} in mode {}".format(
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debug.EVENTS[typ], obj.__class__.__name__, self.mode))
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if typ == QEvent.KeyPress:
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return self._eventFilter_keypress(event)
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else:
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return self._eventFilter_keyrelease(event)
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