yomichan/ext/bg/js/settings/keyboard-mouse-input-field.js

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