148 lines
4.5 KiB
JavaScript
148 lines
4.5 KiB
JavaScript
/*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* Class which handles hotkey events and actions.
|
|
*/
|
|
class HotkeyHandler extends EventDispatcher {
|
|
/**
|
|
* Creates a new instance of the class.
|
|
* @param scope The scope required for hotkey definitions.
|
|
*/
|
|
constructor(scope) {
|
|
super();
|
|
this._scope = scope;
|
|
this._hotkeys = new Map();
|
|
this._actions = new Map();
|
|
this._eventListeners = new EventListenerCollection();
|
|
}
|
|
|
|
/**
|
|
* Gets the scope required for the hotkey definitions.
|
|
*/
|
|
get scope() {
|
|
return this._scope;
|
|
}
|
|
|
|
/**
|
|
* Sets the scope required for the hotkey definitions.
|
|
*/
|
|
set scope(value) {
|
|
this._scope = value;
|
|
}
|
|
|
|
/**
|
|
* Begins listening to key press events in order to detect hotkeys.
|
|
*/
|
|
prepare() {
|
|
this._eventListeners.addEventListener(document, 'keydown', this._onKeyDown.bind(this), false);
|
|
}
|
|
|
|
/**
|
|
* Stops listening to key press events.
|
|
*/
|
|
cleanup() {
|
|
this._eventListeners.removeAllEventListeners();
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @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(hotkeys) {
|
|
for (const {action, key, modifiers, scopes, enabled} of hotkeys) {
|
|
if (
|
|
enabled &&
|
|
key !== null &&
|
|
action !== '' &&
|
|
scopes.includes(this._scope)
|
|
) {
|
|
this._registerHotkey(key, modifiers, action);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Removes all registered hotkeys.
|
|
*/
|
|
clearHotkeys() {
|
|
this._hotkeys.clear();
|
|
}
|
|
|
|
// Private
|
|
|
|
_onKeyDown(e) {
|
|
const key = e.code;
|
|
const handlers = this._hotkeys.get(key);
|
|
if (typeof handlers !== 'undefined') {
|
|
const eventModifiers = DocumentUtil.getActiveModifiers(e);
|
|
for (const {modifiers, action} of handlers) {
|
|
if (!this._areSame(modifiers, eventModifiers)) { continue; }
|
|
|
|
const actionHandler = this._actions.get(action);
|
|
if (typeof actionHandler === 'undefined') { continue; }
|
|
|
|
const result = actionHandler(e);
|
|
if (result !== false) {
|
|
e.preventDefault();
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
this.trigger('keydownNonHotkey', e);
|
|
return false;
|
|
}
|
|
|
|
_registerHotkey(key, modifiers, action) {
|
|
let handlers = this._hotkeys.get(key);
|
|
if (typeof handlers === 'undefined') {
|
|
handlers = [];
|
|
this._hotkeys.set(key, handlers);
|
|
}
|
|
handlers.push({modifiers: new Set(modifiers), action});
|
|
}
|
|
|
|
_areSame(set, array) {
|
|
if (set.size !== array.length) { return false; }
|
|
for (const value of array) {
|
|
if (!set.has(value)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|