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-/*
- * Copyright (C) 2021 Yomichan Authors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- */
-
-/* global
- * DocumentUtil
- * api
- */
-
-/**
- * Class which handles hotkey events and actions.
- */
-class HotkeyHandler extends EventDispatcher {
- /**
- * Creates a new instance of the class.
- */
- constructor() {
- super();
- this._actions = new Map();
- this._hotkeys = new Map();
- this._hotkeyRegistrations = new Map();
- this._eventListeners = new EventListenerCollection();
- this._isPrepared = false;
- this._hasEventListeners = false;
- this._forwardFrameId = null;
- }
-
- /**
- * Gets the frame ID used for forwarding hotkeys.
- */
- get forwardFrameId() {
- return this._forwardFrameId;
- }
-
- /**
- * Sets the frame ID used for forwarding hotkeys.
- */
- set forwardFrameId(value) {
- this._forwardFrameId = value;
- this._updateHotkeyRegistrations();
- }
-
- /**
- * Begins listening to key press events in order to detect hotkeys.
- */
- prepare() {
- this._isPrepared = true;
- this._updateEventHandlers();
- api.crossFrame.registerHandlers([
- ['hotkeyHandler.forwardHotkey', {async: false, handler: this._onMessageForwardHotkey.bind(this)}]
- ]);
- }
-
- /**
- * Registers a set of actions that this hotkey handler supports.
- * @param actions An array of `[name, handler]` entries, where `name` is a string and `handler` is a function.
- */
- registerActions(actions) {
- for (const [name, handler] of actions) {
- this._actions.set(name, handler);
- }
- }
-
- /**
- * Registers a set of hotkeys for a given scope.
- * @param scope The scope that the hotkey definitions must be for in order to be activated.
- * @param hotkeys An array of hotkey definitions of the format `{action, key, modifiers, scopes, enabled}`.
- * * `action` - a string indicating which action to perform.
- * * `key` - a keyboard key code indicating which key needs to be pressed.
- * * `modifiers` - an array of keyboard modifiers which also need to be pressed. Supports: `'alt', 'ctrl', 'shift', 'meta'`.
- * * `scopes` - an array of scopes for which the hotkey is valid. If this array does not contain `this.scope`, the hotkey will not be registered.
- * * `enabled` - a boolean indicating whether the hotkey is currently enabled.
- */
- registerHotkeys(scope, hotkeys) {
- let registrations = this._hotkeyRegistrations.get(scope);
- if (typeof registrations === 'undefined') {
- registrations = [];
- this._hotkeyRegistrations.set(scope, registrations);
- }
- registrations.push(...hotkeys);
- this._updateHotkeyRegistrations();
- }
-
- /**
- * Removes all registered hotkeys for a given scope.
- */
- clearHotkeys(scope) {
- const registrations = this._hotkeyRegistrations.get(scope);
- if (typeof registrations !== 'undefined') {
- registrations.length = 0;
- }
- this._updateHotkeyRegistrations();
- }
-
- /**
- * Assigns a set of hotkeys for a given scope. This is an optimized shorthand for calling
- * `clearHotkeys`, then calling `registerHotkeys`.
- * @see registerHotkeys for argument information.
- */
- setHotkeys(scope, hotkeys) {
- let registrations = this._hotkeyRegistrations.get(scope);
- if (typeof registrations === 'undefined') {
- registrations = [];
- this._hotkeyRegistrations.set(scope, registrations);
- } else {
- registrations.length = 0;
- }
- registrations.push(...hotkeys);
- this._updateHotkeyRegistrations();
- }
-
- /**
- * Adds a single event listener to a specific event.
- * @param eventName The string representing the event's name.
- * @param callback The event listener callback to add.
- */
- on(eventName, callback) {
- const result = super.on(eventName, callback);
- this._updateHasEventListeners();
- this._updateEventHandlers();
- return result;
- }
-
- /**
- * Removes a single event listener from a specific event.
- * @param eventName The string representing the event's name.
- * @param callback The event listener callback to add.
- * @returns `true` if the callback was removed, `false` otherwise.
- */
- off(eventName, callback) {
- const result = super.off(eventName, callback);
- this._updateHasEventListeners();
- this._updateEventHandlers();
- return result;
- }
-
- /**
- * Attempts to simulate an action for a given combination of key and modifiers.
- * @param key A keyboard key code indicating which key needs to be pressed.
- * @param modifiers An array of keyboard modifiers which also need to be pressed. Supports: `'alt', 'ctrl', 'shift', 'meta'`.
- * @returns `true` if an action was performed, `false` otherwise.
- */
- simulate(key, modifiers) {
- const hotkeyInfo = this._hotkeys.get(key);
- return (
- typeof hotkeyInfo !== 'undefined' &&
- this._invokeHandlers(key, modifiers, hotkeyInfo, false)
- );
- }
-
- // Message handlers
-
- _onMessageForwardHotkey({key, modifiers}) {
- return this.simulate(key, modifiers);
- }
-
- // Private
-
- _onKeyDown(e) {
- const key = e.code;
- const hotkeyInfo = this._hotkeys.get(key);
- if (typeof hotkeyInfo !== 'undefined') {
- const eventModifiers = DocumentUtil.getActiveModifiers(e);
- const canForward = (this._forwardFrameId !== null);
- if (this._invokeHandlers(key, eventModifiers, hotkeyInfo, canForward)) {
- e.preventDefault();
- return;
- }
- }
- this.trigger('keydownNonHotkey', e);
- }
-
- _invokeHandlers(key, modifiers, hotkeyInfo, canForward) {
- for (const {modifiers: handlerModifiers, action} of hotkeyInfo.handlers) {
- if (!this._areSame(handlerModifiers, modifiers)) { continue; }
-
- const actionHandler = this._actions.get(action);
- if (typeof actionHandler !== 'undefined') {
- const result = actionHandler();
- if (result !== false) {
- return true;
- }
- }
- }
-
- if (canForward && hotkeyInfo.forward) {
- this._forwardHotkey(key, modifiers);
- return true;
- }
-
- return false;
- }
-
- _areSame(set, array) {
- if (set.size !== array.length) { return false; }
- for (const value of array) {
- if (!set.has(value)) {
- return false;
- }
- }
- return true;
- }
-
- _updateHotkeyRegistrations() {
- if (this._hotkeys.size === 0 && this._hotkeyRegistrations.size === 0) { return; }
-
- const canForward = (this._forwardFrameId !== null);
- this._hotkeys.clear();
- for (const [scope, registrations] of this._hotkeyRegistrations.entries()) {
- for (const {action, key, modifiers, scopes, enabled} of registrations) {
- if (!(enabled && key !== null && action !== '')) { continue; }
-
- const correctScope = scopes.includes(scope);
- if (!correctScope && !canForward) { continue; }
-
- let hotkeyInfo = this._hotkeys.get(key);
- if (typeof hotkeyInfo === 'undefined') {
- hotkeyInfo = {handlers: [], forward: false};
- this._hotkeys.set(key, hotkeyInfo);
- }
-
- if (correctScope) {
- hotkeyInfo.handlers.push({modifiers: new Set(modifiers), action});
- } else {
- hotkeyInfo.forward = true;
- }
- }
- }
- this._updateEventHandlers();
- }
-
- _updateHasEventListeners() {
- this._hasEventListeners = this.hasListeners('keydownNonHotkey');
- }
-
- _updateEventHandlers() {
- if (this._isPrepared && (this._hotkeys.size > 0 || this._hasEventListeners)) {
- if (this._eventListeners.size !== 0) { return; }
- this._eventListeners.addEventListener(document, 'keydown', this._onKeyDown.bind(this), false);
- } else {
- this._eventListeners.removeAllEventListeners();
- }
- }
-
- async _forwardHotkey(key, modifiers) {
- const frameId = this._forwardFrameId;
- if (frameId === null) { throw new Error('No forwarding target'); }
- try {
- await api.crossFrame.invoke(frameId, 'hotkeyHandler.forwardHotkey', {key, modifiers});
- } catch (e) {
- // NOP
- }
- }
-}