205 lines
6.3 KiB
JavaScript
205 lines
6.3 KiB
JavaScript
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/*
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* Copyright (C) 2020 Yomichan Authors
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*
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* This program 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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* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* global
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* DocumentUtil
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*/
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class KeyboardMouseInputField extends EventDispatcher {
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constructor(inputNode, mouseButton, inputNameMap, keySeparator) {
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super();
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this._inputNode = inputNode;
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this._keySeparator = keySeparator;
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this._keyPriorities = new Map([
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['meta', -4],
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['ctrl', -3],
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['alt', -2],
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['shift', -1]
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]);
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this._mouseButton = mouseButton;
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this._inputNameMap = inputNameMap;
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this._mouseInputNamePattern = /^mouse(\d+)$/;
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this._eventListeners = new EventListenerCollection();
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this._value = '';
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this._type = null;
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}
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get value() {
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return this._value;
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}
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prepare(value, type) {
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this.cleanup();
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this._value = value;
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const modifiers = this._splitValue(value);
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const {displayValue} = this._getInputStrings(modifiers);
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const events = [
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[this._inputNode, 'keydown', this._onModifierKeyDown.bind(this), false]
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];
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if (type === 'modifierInputs' && this._mouseButton !== null) {
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events.push(
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[this._mouseButton, 'mousedown', this._onMouseButtonMouseDown.bind(this), false],
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[this._mouseButton, 'mouseup', this._onMouseButtonMouseUp.bind(this), false],
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[this._mouseButton, 'contextmenu', this._onMouseButtonContextMenu.bind(this), false]
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);
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}
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this._inputNode.value = displayValue;
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for (const args of events) {
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this._eventListeners.addEventListener(...args);
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}
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}
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cleanup() {
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this._eventListeners.removeAllEventListeners();
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this._value = '';
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this._type = null;
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}
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// Private
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_splitValue(value) {
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return value.split(/[,;\s]+/).map((v) => v.trim().toLowerCase()).filter((v) => v.length > 0);
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}
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_sortInputs(inputs) {
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const pattern = this._mouseInputNamePattern;
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const keyPriorities = this._keyPriorities;
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const inputInfos = inputs.map((value, index) => {
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const match = pattern.exec(value);
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if (match !== null) {
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return [value, 1, Number.parseInt(match[1], 10), index];
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} else {
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let priority = keyPriorities.get(value);
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if (typeof priority === 'undefined') { priority = 0; }
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return [value, 0, priority, index];
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}
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});
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inputInfos.sort((a, b) => {
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let i = a[1] - b[1];
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if (i !== 0) { return i; }
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i = a[2] - b[2];
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if (i !== 0) { return i; }
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i = a[0].localeCompare(b[0], 'en-US'); // Ensure an invariant culture
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if (i !== 0) { return i; }
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i = a[3] - b[3];
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return i;
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});
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return inputInfos.map(([value]) => value);
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}
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_getInputStrings(inputs) {
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let value = '';
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let displayValue = '';
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let first = true;
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for (const input of inputs) {
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const {name} = this._getInputName(input);
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if (first) {
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first = false;
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} else {
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value += ', ';
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displayValue += this._keySeparator;
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}
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value += input;
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displayValue += name;
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}
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return {value, displayValue};
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}
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_getInputName(value) {
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const pattern = this._mouseInputNamePattern;
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const match = pattern.exec(value);
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if (match !== null) {
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return {name: `Mouse ${match[1]}`, type: 'mouse'};
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}
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let name = this._inputNameMap.get(value);
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if (typeof name === 'undefined') { name = value; }
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return {name, type: 'key'};
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}
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_getModifierKeys(e) {
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const modifiers = DocumentUtil.getActiveModifiers(e);
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// https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/metaKey
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// https://askubuntu.com/questions/567731/why-is-shift-alt-being-mapped-to-meta
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// It works with mouse events on some platforms, so try to determine if metaKey is pressed.
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// This is a hack and only works when both Shift and Alt are not pressed.
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if (
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!modifiers.has('meta') &&
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DocumentUtil.getKeyFromEvent(e) === 'Meta' &&
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!(
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modifiers.size === 2 &&
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modifiers.has('shift') &&
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modifiers.has('alt')
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)
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) {
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modifiers.add('meta');
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}
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return modifiers;
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}
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_onModifierKeyDown(e) {
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e.preventDefault();
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const key = DocumentUtil.getKeyFromEvent(e);
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switch (key) {
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case 'Escape':
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case 'Backspace':
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this._updateInputs([]);
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break;
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default:
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this._addInputs(this._getModifierKeys(e));
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break;
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}
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}
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_onMouseButtonMouseDown(e) {
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e.preventDefault();
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this._addInputs([`mouse${e.button}`]);
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}
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_onMouseButtonMouseUp(e) {
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e.preventDefault();
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}
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_onMouseButtonContextMenu(e) {
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e.preventDefault();
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}
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_addInputs(newInputs) {
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const inputs = new Set(this._splitValue(this._value));
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for (const input of newInputs) {
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inputs.add(input);
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}
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this._updateInputs([...inputs]);
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}
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_updateInputs(inputs) {
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inputs = this._sortInputs(inputs);
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const node = this._inputNode;
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const {value, displayValue} = this._getInputStrings(inputs);
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node.value = displayValue;
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if (this._value === value) { return; }
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this._value = value;
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this.trigger('change', {value, displayValue});
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}
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}
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