JavaScript Key Binding Library
目前为
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.icu/scripts/23404/148850/keyboard-js.js
"use strict"
var Keyboard = (function () {
function __Keyboard() {
this.keys = {} // to record the pressed key
this.register_list = {} // to record the registers(key combos)
this.state = {} // to record every register matching condition. do you want to get this value?
this.specialKeyString = {
"altKey": "Alt",
"ctrlKey": "Control",
"metaKey": "Meta",
"shiftKey": "Shift"
}
}
__Keyboard.prototype.listen = function () {
var option = this.option, element = document
if (option.element && typeof option.element.addEventListener === 'function') {
element = option.element
}
element.addEventListener('keydown', this.keydown.bind(this), false)
element.addEventListener('keyup', this.keyup.bind(this), false)
}
__Keyboard.prototype.unlisten = function () {
// maybe you need callback?
var option = this.option, element = document
if (option.element && typeof option.element.removeEventListener === 'function') {
element = option.element
}
element.removeEventListener('keydown', function () { })
element.removeEventListener('keyup', function () { })
}
__Keyboard.prototype.test = function (event) {
return this.testRegisters(event)
}
__Keyboard.prototype.testRegisters = function (event) {
var register_list = this.register_list
var register_names = Object.keys(register_list)
var testKeys = this.testKeys.bind(this)
var state = {}
for (var i = 0, len = register_names.length; i < len; i++) {
var regName = register_names[i]
var reg = register_list[regName]
var keylist = reg[0]
var callback = reg[1]
// hit the target
if (testKeys(keylist)) {
if (callback && typeof callback === 'function') {
// TODO:
// Need event object? or context?
var __wrapper_callback = (function () {
event.clearKeys = this.clearKeys.bind(this)
// inject the event(the last key) object
callback(event)
// BUG:
// when use `alert` or `confirm`, the event(keyup) of the pressed key will lost.
// so, you will don't know the key is really pressed or not when you are back.
// here code just detects some special keys.
// SO DO NOT USE ALERT OR CONFIRM!
Array.prototype.map.call(Object.keys(this.specialKeyString), ((function (key) {
if (event[key]) this.keys[this.specialKeyString[key]] = true
}).bind(this)))
}).bind(this)
if (window.requestAnimationFrame)
window.requestAnimationFrame(__wrapper_callback)
else
setTimeout(__wrapper_callback, 16)
}
state[regName] = true
// if match successfully, return directly.
return state
}
}
return state
}
// @param keylist Array(Array) [combo1, combo2, ...]
__Keyboard.prototype.testKeys = function (keylist) {
var result = [], state = false
for (var i = 0, len = keylist.length; i < len; i++) {
var combo = keylist[i]
var allPressedkeys = Object.keys(this.keys)
var nowPressedkeys = []
var __state = 0 // no state. not true or false
// collect all pressed key now
allPressedkeys.forEach((function (value, index) {
if (this.keys[value]) nowPressedkeys.push(value)
}).bind(this))
// DEBUG: print the pressing key message
// console.log(allPressedkeys, this.keys)
if (this.option.DEBUG === true) {
var __printKey = nowPressedkeys.map(function (k, i) {
if (k === " ") return "Space"
else return k
}).join(" ")
console.log('[' + Date.now() + '] You hit key: %c' + __printKey, 'color: #ea4335; font-size: 16px')
}
// compare nowPressedkeys and combo
// console.log('compare: ', nowPressedkeys, combo)
if (nowPressedkeys.length !== combo.length) {
__state = false
} else {
for (var j = 0, len2 = combo.length; j < len2; j++) {
if (nowPressedkeys.indexOf(combo[j]) < 0) {
// not in the array
__state = false
break
}
}
// if j is equal to combo.length, this means that user hit the combo.
// otherwise, user does't.
if (j === combo.length && __state !== false) __state = true
}
result.push(__state)
}
// console.log('> result', result, this.keys)
result.forEach(function (v, i) {
if (v === true) state = true
})
return state
}
__Keyboard.prototype.keydown = function (event) {
var key = event.key, state = {}, rlt = true, map = Array.prototype.map
this.keys[key] = event.type === 'keydown'
// this.keys[key] = true
// the result of test
// true: hit the target, then prevent the default action, so return true
// otherwise, don't prevent it, so return false
state = this.test(event)
Object.keys(state).forEach(function (regName, i) {
if (state[regName] === true) rlt = false
})
this.state = state
if (!rlt) {
event.preventDefault()
event.stopPropagation()
// event.stopImmediatePropagation()
}
// console.log(rlt)
return rlt
}
__Keyboard.prototype.keyup = function (event) {
var key = event.key
this.keys[key] = false
return true
}
__Keyboard.prototype.register = function (name, callback, keylist) {
if (typeof name !== 'string') throw new Error('Please input the register name.')
if (this.register_list[name]) throw new Error('The ' + name + ' has existed!')
var keylist = Array.prototype.slice.call(arguments, 2)
if (!(keylist[0] instanceof Array)) keylist = [keylist] // init [combo1:Array, combo2:Array, ....]
this.register_list[name] = [keylist, callback]
}
__Keyboard.prototype.clearRegister = function (name) {
delete this.register_list[name]
}
__Keyboard.prototype.clearRegisterAll = function () {
this.register_list = {}
}
__Keyboard.prototype.clearKeys = function () {
this.keys = {}
}
var k = new __Keyboard()
var __instance = {
start: function () { k.listen() },
end: function () { k.unlisten(); k.clearRegisterAll(); k.clearKeys(); },
register: function () { k.register.apply(k, arguments) },
unregister: function () { k.clearRegister.apply(k, arguments) },
// for test
__keydown: function () { k.keydown.apply(k, arguments) },
__keyup: function () { k.keyup.apply(k, arguments) },
}
return function (o) {
k.option = o || {}
window.addEventListener('focus', function () {
k.keys = {}
}, false)
// window.addEventListener('blur', function () {
// k.keys = {}
// }, false)
return __instance
}
})()
if (typeof exports !== "undefined") {
exports.Keyboard = Keyboard
} else if (typeof define !== 'undefined' && typeof define === 'function') {
define("Keyboard", [], function () {
return Keyboard
})
} else {
if (window.Keyboard === undefined) window.Keyboard = Keyboard
else {
throw new Error('Library Keyboard has existed! Loaded failed.')
}
}