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diff --git a/ext/js/pages/settings/keyboard-mouse-input-field.js b/ext/js/pages/settings/keyboard-mouse-input-field.js
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+/*
+ * Copyright (C) 2020-2021 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
+ * HotkeyUtil
+ */
+
+class KeyboardMouseInputField extends EventDispatcher {
+ constructor(inputNode, mouseButton, os, isPointerTypeSupported=null) {
+ super();
+ this._inputNode = inputNode;
+ this._mouseButton = mouseButton;
+ this._isPointerTypeSupported = isPointerTypeSupported;
+ this._hotkeyUtil = new HotkeyUtil(os);
+ this._eventListeners = new EventListenerCollection();
+ this._key = null;
+ this._modifiers = [];
+ this._penPointerIds = new Set();
+ this._mouseModifiersSupported = false;
+ this._keySupported = false;
+ }
+
+ get modifiers() {
+ return this._modifiers;
+ }
+
+ prepare(key, modifiers, mouseModifiersSupported=false, keySupported=false) {
+ this.cleanup();
+
+ this._mouseModifiersSupported = mouseModifiersSupported;
+ this._keySupported = keySupported;
+ this.setInput(key, modifiers);
+ const events = [
+ [this._inputNode, 'keydown', this._onModifierKeyDown.bind(this), false],
+ [this._inputNode, 'keyup', this._onModifierKeyUp.bind(this), false]
+ ];
+ if (mouseModifiersSupported && this._mouseButton !== null) {
+ events.push(
+ [this._mouseButton, 'mousedown', this._onMouseButtonMouseDown.bind(this), false],
+ [this._mouseButton, 'pointerdown', this._onMouseButtonPointerDown.bind(this), false],
+ [this._mouseButton, 'pointerover', this._onMouseButtonPointerOver.bind(this), false],
+ [this._mouseButton, 'pointerout', this._onMouseButtonPointerOut.bind(this), false],
+ [this._mouseButton, 'pointercancel', this._onMouseButtonPointerCancel.bind(this), false],
+ [this._mouseButton, 'mouseup', this._onMouseButtonMouseUp.bind(this), false],
+ [this._mouseButton, 'contextmenu', this._onMouseButtonContextMenu.bind(this), false]
+ );
+ }
+ for (const args of events) {
+ this._eventListeners.addEventListener(...args);
+ }
+ }
+
+ setInput(key, modifiers) {
+ this._key = key;
+ this._modifiers = this._sortModifiers(modifiers);
+ this._updateDisplayString();
+ }
+
+ cleanup() {
+ this._eventListeners.removeAllEventListeners();
+ this._modifiers = [];
+ this._key = null;
+ this._mouseModifiersSupported = false;
+ this._keySupported = false;
+ this._penPointerIds.clear();
+ }
+
+ clearInputs() {
+ this._updateModifiers([], null);
+ }
+
+ // Private
+
+ _sortModifiers(modifiers) {
+ return this._hotkeyUtil.sortModifiers(modifiers);
+ }
+
+ _updateDisplayString() {
+ const displayValue = this._hotkeyUtil.getInputDisplayValue(this._key, this._modifiers);
+ this._inputNode.value = displayValue;
+ }
+
+ _getModifierKeys(e) {
+ const modifiers = new Set(DocumentUtil.getActiveModifiers(e));
+ // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/metaKey
+ // https://askubuntu.com/questions/567731/why-is-shift-alt-being-mapped-to-meta
+ // It works with mouse events on some platforms, so try to determine if metaKey is pressed.
+ // This is a hack and only works when both Shift and Alt are not pressed.
+ if (
+ !modifiers.has('meta') &&
+ e.key === 'Meta' &&
+ !(
+ modifiers.size === 2 &&
+ modifiers.has('shift') &&
+ modifiers.has('alt')
+ )
+ ) {
+ modifiers.add('meta');
+ }
+ return modifiers;
+ }
+
+ _isModifierKey(keyName) {
+ switch (keyName) {
+ case 'AltLeft':
+ case 'AltRight':
+ case 'ControlLeft':
+ case 'ControlRight':
+ case 'MetaLeft':
+ case 'MetaRight':
+ case 'ShiftLeft':
+ case 'ShiftRight':
+ case 'OSLeft':
+ case 'OSRight':
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ _onModifierKeyDown(e) {
+ e.preventDefault();
+
+ let key = e.code;
+ if (key === 'Unidentified' || key === '') { key = void 0; }
+ if (this._keySupported) {
+ this._updateModifiers([...this._getModifierKeys(e)], this._isModifierKey(key) ? void 0 : key);
+ } else {
+ switch (key) {
+ case 'Escape':
+ case 'Backspace':
+ this.clearInputs();
+ break;
+ default:
+ this._addModifiers(this._getModifierKeys(e));
+ break;
+ }
+ }
+ }
+
+ _onModifierKeyUp(e) {
+ e.preventDefault();
+ }
+
+ _onMouseButtonMouseDown(e) {
+ e.preventDefault();
+ this._addModifiers(DocumentUtil.getActiveButtons(e));
+ }
+
+ _onMouseButtonPointerDown(e) {
+ if (!e.isPrimary) { return; }
+
+ let {pointerType, pointerId} = e;
+ // Workaround for Firefox bug not detecting certain 'touch' events as 'pen' events.
+ if (this._penPointerIds.has(pointerId)) { pointerType = 'pen'; }
+
+ if (
+ typeof this._isPointerTypeSupported !== 'function' ||
+ !this._isPointerTypeSupported(pointerType)
+ ) {
+ return;
+ }
+ e.preventDefault();
+ this._addModifiers(DocumentUtil.getActiveButtons(e));
+ }
+
+ _onMouseButtonPointerOver(e) {
+ const {pointerType, pointerId} = e;
+ if (pointerType === 'pen') {
+ this._penPointerIds.add(pointerId);
+ }
+ }
+
+ _onMouseButtonPointerOut(e) {
+ const {pointerId} = e;
+ this._penPointerIds.delete(pointerId);
+ }
+
+ _onMouseButtonPointerCancel(e) {
+ this._onMouseButtonPointerOut(e);
+ }
+
+ _onMouseButtonMouseUp(e) {
+ e.preventDefault();
+ }
+
+ _onMouseButtonContextMenu(e) {
+ e.preventDefault();
+ }
+
+ _addModifiers(newModifiers, newKey) {
+ const modifiers = new Set(this._modifiers);
+ for (const modifier of newModifiers) {
+ modifiers.add(modifier);
+ }
+ this._updateModifiers([...modifiers], newKey);
+ }
+
+ _updateModifiers(modifiers, newKey) {
+ modifiers = this._sortModifiers(modifiers);
+
+ let changed = false;
+ if (typeof newKey !== 'undefined' && this._key !== newKey) {
+ this._key = newKey;
+ changed = true;
+ }
+ if (!this._areArraysEqual(this._modifiers, modifiers)) {
+ this._modifiers = modifiers;
+ changed = true;
+ }
+
+ this._updateDisplayString();
+ if (changed) {
+ this.trigger('change', {modifiers: this._modifiers, key: this._key});
+ }
+ }
+
+ _areArraysEqual(array1, array2) {
+ const length = array1.length;
+ if (length !== array2.length) { return false; }
+
+ for (let i = 0; i < length; ++i) {
+ if (array1[i] !== array2[i]) { return false; }
+ }
+
+ return true;
+ }
+}