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864 lines
25 KiB
JavaScript
864 lines
25 KiB
JavaScript
/**
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* Copyright 2012 Craig Campbell
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Mousetrap is a simple keyboard shortcut library for Javascript with
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* no external dependencies
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*
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* @version 1.2.2
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* @url craig.is/killing/mice
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*/
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(function() {
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/**
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* mapping of special keycodes to their corresponding keys
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*
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* everything in this dictionary cannot use keypress events
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* so it has to be here to map to the correct keycodes for
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* keyup/keydown events
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*
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* @type {Object}
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*/
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var _MAP = {
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8: 'backspace',
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9: 'tab',
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13: 'enter',
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16: 'shift',
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17: 'ctrl',
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18: 'alt',
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20: 'capslock',
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27: 'esc',
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32: 'space',
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33: 'pageup',
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34: 'pagedown',
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35: 'end',
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36: 'home',
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37: 'left',
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38: 'up',
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39: 'right',
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40: 'down',
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45: 'ins',
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46: 'del',
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91: 'meta',
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93: 'meta',
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224: 'meta'
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},
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/**
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* mapping for special characters so they can support
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*
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* this dictionary is only used incase you want to bind a
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* keyup or keydown event to one of these keys
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*
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* @type {Object}
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*/
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_KEYCODE_MAP = {
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106: '*',
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107: '+',
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109: '-',
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110: '.',
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111 : '/',
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186: ';',
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187: '=',
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188: ',',
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189: '-',
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190: '.',
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191: '/',
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192: '`',
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219: '[',
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220: '\\',
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221: ']',
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222: '\''
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},
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/**
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* this is a mapping of keys that require shift on a US keypad
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* back to the non shift equivelents
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*
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* this is so you can use keyup events with these keys
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*
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* note that this will only work reliably on US keyboards
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*
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* @type {Object}
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*/
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_SHIFT_MAP = {
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'~': '`',
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'!': '1',
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'@': '2',
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'#': '3',
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'$': '4',
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'%': '5',
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'^': '6',
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'&': '7',
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'*': '8',
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'(': '9',
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')': '0',
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'_': '-',
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'+': '=',
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':': ';',
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'\"': '\'',
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'<': ',',
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'>': '.',
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'?': '/',
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'|': '\\'
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},
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/**
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* this is a list of special strings you can use to map
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* to modifier keys when you specify your keyboard shortcuts
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*
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* @type {Object}
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*/
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_SPECIAL_ALIASES = {
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'option': 'alt',
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'command': 'meta',
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'return': 'enter',
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'escape': 'esc'
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},
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/**
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* variable to store the flipped version of _MAP from above
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* needed to check if we should use keypress or not when no action
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* is specified
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*
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* @type {Object|undefined}
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*/
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_REVERSE_MAP,
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/**
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* a list of all the callbacks setup via Mousetrap.bind()
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*
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* @type {Object}
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*/
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_callbacks = {},
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/**
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* direct map of string combinations to callbacks used for trigger()
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*
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* @type {Object}
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*/
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_direct_map = {},
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/**
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* keeps track of what level each sequence is at since multiple
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* sequences can start out with the same sequence
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*
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* @type {Object}
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*/
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_sequence_levels = {},
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/**
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* variable to store the setTimeout call
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*
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* @type {null|number}
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*/
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_reset_timer,
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/**
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* temporary state where we will ignore the next keyup
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*
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* @type {boolean|string}
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*/
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_ignore_next_keyup = false,
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/**
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* are we currently inside of a sequence?
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* type of action ("keyup" or "keydown" or "keypress") or false
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*
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* @type {boolean|string}
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*/
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_sequence_type = false;
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/**
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* loop through the f keys, f1 to f19 and add them to the map
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* programatically
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*/
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for (var i = 1; i < 20; ++i) {
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_MAP[111 + i] = 'f' + i;
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}
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/**
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* loop through to map numbers on the numeric keypad
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*/
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for (i = 0; i <= 9; ++i) {
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_MAP[i + 96] = i;
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}
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/**
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* cross browser add event method
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*
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* @param {Element|HTMLDocument} object
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* @param {string} type
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* @param {Function} callback
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* @returns void
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*/
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function _addEvent(object, type, callback) {
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if (object.addEventListener) {
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object.addEventListener(type, callback, false);
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return;
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}
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object.attachEvent('on' + type, callback);
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}
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/**
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* takes the event and returns the key character
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*
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* @param {Event} e
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* @return {string}
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*/
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function _characterFromEvent(e) {
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// for keypress events we should return the character as is
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if (e.type == 'keypress') {
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return String.fromCharCode(e.which);
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}
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// for non keypress events the special maps are needed
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if (_MAP[e.which]) {
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return _MAP[e.which];
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}
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if (_KEYCODE_MAP[e.which]) {
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return _KEYCODE_MAP[e.which];
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}
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// if it is not in the special map
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return String.fromCharCode(e.which).toLowerCase();
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}
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/**
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* checks if two arrays are equal
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*
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* @param {Array} modifiers1
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* @param {Array} modifiers2
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* @returns {boolean}
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*/
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function _modifiersMatch(modifiers1, modifiers2) {
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return modifiers1.sort().join(',') === modifiers2.sort().join(',');
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}
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/**
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* resets all sequence counters except for the ones passed in
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*
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* @param {Object} do_not_reset
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* @returns void
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*/
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function _resetSequences(do_not_reset, max_level) {
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do_not_reset = do_not_reset || {};
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var active_sequences = false,
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key;
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for (key in _sequence_levels) {
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if (do_not_reset[key] && _sequence_levels[key] > max_level) {
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active_sequences = true;
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continue;
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}
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_sequence_levels[key] = 0;
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}
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if (!active_sequences) {
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_sequence_type = false;
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}
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}
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/**
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* finds all callbacks that match based on the keycode, modifiers,
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* and action
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*
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* @param {string} character
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* @param {Array} modifiers
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* @param {Event|Object} e
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* @param {boolean=} remove - should we remove any matches
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* @param {string=} combination
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* @returns {Array}
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*/
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function _getMatches(character, modifiers, e, remove, combination) {
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var i,
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callback,
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matches = [],
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action = e.type;
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// if there are no events related to this keycode
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if (!_callbacks[character]) {
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return [];
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}
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// if a modifier key is coming up on its own we should allow it
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if (action == 'keyup' && _isModifier(character)) {
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modifiers = [character];
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}
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// loop through all callbacks for the key that was pressed
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// and see if any of them match
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for (i = 0; i < _callbacks[character].length; ++i) {
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callback = _callbacks[character][i];
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// if this is a sequence but it is not at the right level
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// then move onto the next match
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if (callback.seq && _sequence_levels[callback.seq] != callback.level) {
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continue;
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}
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// if the action we are looking for doesn't match the action we got
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// then we should keep going
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if (action != callback.action) {
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continue;
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}
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// if this is a keypress event and the meta key and control key
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// are not pressed that means that we need to only look at the
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// character, otherwise check the modifiers as well
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//
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// chrome will not fire a keypress if meta or control is down
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// safari will fire a keypress if meta or meta+shift is down
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// firefox will fire a keypress if meta or control is down
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if ((action == 'keypress' && !e.metaKey && !e.ctrlKey) || _modifiersMatch(modifiers, callback.modifiers)) {
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// remove is used so if you change your mind and call bind a
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// second time with a new function the first one is overwritten
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if (remove && callback.combo == combination) {
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_callbacks[character].splice(i, 1);
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}
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matches.push(callback);
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}
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}
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return matches;
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}
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/**
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* takes a key event and figures out what the modifiers are
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*
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* @param {Event} e
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* @returns {Array}
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*/
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function _eventModifiers(e) {
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var modifiers = [];
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if (e.shiftKey) {
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modifiers.push('shift');
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}
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if (e.altKey) {
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modifiers.push('alt');
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}
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if (e.ctrlKey) {
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modifiers.push('ctrl');
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}
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if (e.metaKey) {
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modifiers.push('meta');
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}
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return modifiers;
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}
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/**
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* actually calls the callback function
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*
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* if your callback function returns false this will use the jquery
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* convention - prevent default and stop propogation on the event
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*
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* @param {Function} callback
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* @param {Event} e
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* @returns void
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*/
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function _fireCallback(callback, e, combo) {
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// if this event should not happen stop here
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if (Mousetrap.stopCallback(e, e.target || e.srcElement, combo)) {
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return;
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}
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if (callback(e, combo) === false) {
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if (e.preventDefault) {
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e.preventDefault();
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}
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if (e.stopPropagation) {
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e.stopPropagation();
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}
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e.returnValue = false;
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e.cancelBubble = true;
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}
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}
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/**
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* handles a character key event
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*
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* @param {string} character
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* @param {Event} e
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* @returns void
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*/
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function _handleCharacter(character, e) {
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var callbacks = _getMatches(character, _eventModifiers(e), e),
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i,
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do_not_reset = {},
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max_level = 0,
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processed_sequence_callback = false;
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// loop through matching callbacks for this key event
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for (i = 0; i < callbacks.length; ++i) {
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// fire for all sequence callbacks
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// this is because if for example you have multiple sequences
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// bound such as "g i" and "g t" they both need to fire the
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// callback for matching g cause otherwise you can only ever
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// match the first one
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if (callbacks[i].seq) {
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processed_sequence_callback = true;
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// as we loop through keep track of the max
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// any sequence at a lower level will be discarded
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max_level = Math.max(max_level, callbacks[i].level);
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// keep a list of which sequences were matches for later
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do_not_reset[callbacks[i].seq] = 1;
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_fireCallback(callbacks[i].callback, e, callbacks[i].combo);
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continue;
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}
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// if there were no sequence matches but we are still here
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// that means this is a regular match so we should fire that
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if (!processed_sequence_callback && !_sequence_type) {
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_fireCallback(callbacks[i].callback, e, callbacks[i].combo);
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}
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}
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// if you are inside of a sequence and the key you are pressing
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// is not a modifier key then we should reset all sequences
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// that were not matched by this key event
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if (e.type == _sequence_type && !_isModifier(character)) {
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_resetSequences(do_not_reset, max_level);
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}
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}
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/**
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* handles a keydown event
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*
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* @param {Event} e
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* @returns void
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*/
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function _handleKey(e) {
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// normalize e.which for key events
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// @see http://stackoverflow.com/questions/4285627/javascript-keycode-vs-charcode-utter-confusion
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if (typeof e.which !== 'number') {
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e.which = e.keyCode;
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}
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var character = _characterFromEvent(e);
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// no character found then stop
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if (!character) {
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return;
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}
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if (e.type == 'keyup' && _ignore_next_keyup == character) {
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_ignore_next_keyup = false;
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return;
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}
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_handleCharacter(character, e);
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}
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/**
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* determines if the keycode specified is a modifier key or not
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*
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* @param {string} key
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* @returns {boolean}
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*/
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function _isModifier(key) {
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return key == 'shift' || key == 'ctrl' || key == 'alt' || key == 'meta';
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}
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/**
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* called to set a 1 second timeout on the specified sequence
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*
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* this is so after each key press in the sequence you have 1 second
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* to press the next key before you have to start over
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*
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* @returns void
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*/
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function _resetSequenceTimer() {
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clearTimeout(_reset_timer);
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_reset_timer = setTimeout(_resetSequences, 1000);
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}
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/**
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* reverses the map lookup so that we can look for specific keys
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* to see what can and can't use keypress
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*
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* @return {Object}
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*/
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function _getReverseMap() {
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if (!_REVERSE_MAP) {
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_REVERSE_MAP = {};
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for (var key in _MAP) {
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// pull out the numeric keypad from here cause keypress should
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// be able to detect the keys from the character
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if (key > 95 && key < 112) {
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continue;
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}
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if (_MAP.hasOwnProperty(key)) {
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_REVERSE_MAP[_MAP[key]] = key;
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}
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}
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}
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return _REVERSE_MAP;
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}
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/**
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* picks the best action based on the key combination
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*
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* @param {string} key - character for key
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* @param {Array} modifiers
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* @param {string=} action passed in
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*/
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function _pickBestAction(key, modifiers, action) {
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// if no action was picked in we should try to pick the one
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// that we think would work best for this key
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if (!action) {
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action = _getReverseMap()[key] ? 'keydown' : 'keypress';
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}
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// modifier keys don't work as expected with keypress,
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// switch to keydown
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if (action == 'keypress' && modifiers.length) {
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action = 'keydown';
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}
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return action;
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}
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/**
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* binds a key sequence to an event
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*
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* @param {string} combo - combo specified in bind call
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* @param {Array} keys
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* @param {Function} callback
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* @param {string=} action
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* @returns void
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*/
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function _bindSequence(combo, keys, callback, action) {
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// start off by adding a sequence level record for this combination
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// and setting the level to 0
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_sequence_levels[combo] = 0;
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// if there is no action pick the best one for the first key
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// in the sequence
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if (!action) {
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action = _pickBestAction(keys[0], []);
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}
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/**
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* callback to increase the sequence level for this sequence and reset
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* all other sequences that were active
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*
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* @param {Event} e
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* @returns void
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*/
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var _increaseSequence = function(e) {
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_sequence_type = action;
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++_sequence_levels[combo];
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_resetSequenceTimer();
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},
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/**
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* wraps the specified callback inside of another function in order
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* to reset all sequence counters as soon as this sequence is done
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*
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* @param {Event} e
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* @returns void
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*/
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_callbackAndReset = function(e) {
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_fireCallback(callback, e, combo);
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// we should ignore the next key up if the action is key down
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// or keypress. this is so if you finish a sequence and
|
|
// release the key the final key will not trigger a keyup
|
|
if (action !== 'keyup') {
|
|
_ignore_next_keyup = _characterFromEvent(e);
|
|
}
|
|
|
|
// weird race condition if a sequence ends with the key
|
|
// another sequence begins with
|
|
setTimeout(_resetSequences, 10);
|
|
},
|
|
i;
|
|
|
|
// loop through keys one at a time and bind the appropriate callback
|
|
// function. for any key leading up to the final one it should
|
|
// increase the sequence. after the final, it should reset all sequences
|
|
for (i = 0; i < keys.length; ++i) {
|
|
_bindSingle(keys[i], i < keys.length - 1 ? _increaseSequence : _callbackAndReset, action, combo, i);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* binds a single keyboard combination
|
|
*
|
|
* @param {string} combination
|
|
* @param {Function} callback
|
|
* @param {string=} action
|
|
* @param {string=} sequence_name - name of sequence if part of sequence
|
|
* @param {number=} level - what part of the sequence the command is
|
|
* @returns void
|
|
*/
|
|
function _bindSingle(combination, callback, action, sequence_name, level) {
|
|
|
|
// make sure multiple spaces in a row become a single space
|
|
combination = combination.replace(/\s+/g, ' ');
|
|
|
|
var sequence = combination.split(' '),
|
|
i,
|
|
key,
|
|
keys,
|
|
modifiers = [];
|
|
|
|
// if this pattern is a sequence of keys then run through this method
|
|
// to reprocess each pattern one key at a time
|
|
if (sequence.length > 1) {
|
|
_bindSequence(combination, sequence, callback, action);
|
|
return;
|
|
}
|
|
|
|
// take the keys from this pattern and figure out what the actual
|
|
// pattern is all about
|
|
keys = combination === '+' ? ['+'] : combination.split('+');
|
|
|
|
for (i = 0; i < keys.length; ++i) {
|
|
key = keys[i];
|
|
|
|
// normalize key names
|
|
if (_SPECIAL_ALIASES[key]) {
|
|
key = _SPECIAL_ALIASES[key];
|
|
}
|
|
|
|
// if this is not a keypress event then we should
|
|
// be smart about using shift keys
|
|
// this will only work for US keyboards however
|
|
if (action && action != 'keypress' && _SHIFT_MAP[key]) {
|
|
key = _SHIFT_MAP[key];
|
|
modifiers.push('shift');
|
|
}
|
|
|
|
// if this key is a modifier then add it to the list of modifiers
|
|
if (_isModifier(key)) {
|
|
modifiers.push(key);
|
|
}
|
|
}
|
|
|
|
// depending on what the key combination is
|
|
// we will try to pick the best event for it
|
|
action = _pickBestAction(key, modifiers, action);
|
|
|
|
// make sure to initialize array if this is the first time
|
|
// a callback is added for this key
|
|
if (!_callbacks[key]) {
|
|
_callbacks[key] = [];
|
|
}
|
|
|
|
// remove an existing match if there is one
|
|
_getMatches(key, modifiers, {type: action}, !sequence_name, combination);
|
|
|
|
// add this call back to the array
|
|
// if it is a sequence put it at the beginning
|
|
// if not put it at the end
|
|
//
|
|
// this is important because the way these are processed expects
|
|
// the sequence ones to come first
|
|
_callbacks[key][sequence_name ? 'unshift' : 'push']({
|
|
callback: callback,
|
|
modifiers: modifiers,
|
|
action: action,
|
|
seq: sequence_name,
|
|
level: level,
|
|
combo: combination
|
|
});
|
|
}
|
|
|
|
/**
|
|
* binds multiple combinations to the same callback
|
|
*
|
|
* @param {Array} combinations
|
|
* @param {Function} callback
|
|
* @param {string|undefined} action
|
|
* @returns void
|
|
*/
|
|
function _bindMultiple(combinations, callback, action) {
|
|
for (var i = 0; i < combinations.length; ++i) {
|
|
_bindSingle(combinations[i], callback, action);
|
|
}
|
|
}
|
|
|
|
// start!
|
|
_addEvent(document, 'keypress', _handleKey);
|
|
_addEvent(document, 'keydown', _handleKey);
|
|
_addEvent(document, 'keyup', _handleKey);
|
|
|
|
var Mousetrap = {
|
|
|
|
/**
|
|
* binds an event to mousetrap
|
|
*
|
|
* can be a single key, a combination of keys separated with +,
|
|
* an array of keys, or a sequence of keys separated by spaces
|
|
*
|
|
* be sure to list the modifier keys first to make sure that the
|
|
* correct key ends up getting bound (the last key in the pattern)
|
|
*
|
|
* @param {string|Array} keys
|
|
* @param {Function} callback
|
|
* @param {string=} action - 'keypress', 'keydown', or 'keyup'
|
|
* @returns void
|
|
*/
|
|
bind: function(keys, callback, action) {
|
|
_bindMultiple(keys instanceof Array ? keys : [keys], callback, action);
|
|
_direct_map[keys + ':' + action] = callback;
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* unbinds an event to mousetrap
|
|
*
|
|
* the unbinding sets the callback function of the specified key combo
|
|
* to an empty function and deletes the corresponding key in the
|
|
* _direct_map dict.
|
|
*
|
|
* the keycombo+action has to be exactly the same as
|
|
* it was defined in the bind method
|
|
*
|
|
* TODO: actually remove this from the _callbacks dictionary instead
|
|
* of binding an empty function
|
|
*
|
|
* @param {string|Array} keys
|
|
* @param {string} action
|
|
* @returns void
|
|
*/
|
|
unbind: function(keys, action) {
|
|
if (_direct_map[keys + ':' + action]) {
|
|
delete _direct_map[keys + ':' + action];
|
|
this.bind(keys, function() {}, action);
|
|
}
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* triggers an event that has already been bound
|
|
*
|
|
* @param {string} keys
|
|
* @param {string=} action
|
|
* @returns void
|
|
*/
|
|
trigger: function(keys, action) {
|
|
_direct_map[keys + ':' + action]();
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* resets the library back to its initial state. this is useful
|
|
* if you want to clear out the current keyboard shortcuts and bind
|
|
* new ones - for example if you switch to another page
|
|
*
|
|
* @returns void
|
|
*/
|
|
reset: function() {
|
|
_callbacks = {};
|
|
_direct_map = {};
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* should we stop this event before firing off callbacks
|
|
*
|
|
* @param {Event} e
|
|
* @param {Element} element
|
|
* @return {boolean}
|
|
*/
|
|
stopCallback: function(e, element, combo) {
|
|
|
|
// if the element has the class "mousetrap" then no need to stop
|
|
if ((' ' + element.className + ' ').indexOf(' mousetrap ') > -1) {
|
|
return false;
|
|
}
|
|
|
|
// stop for input, select, and textarea
|
|
return element.tagName == 'INPUT' || element.tagName == 'SELECT' || element.tagName == 'TEXTAREA' || (element.contentEditable && element.contentEditable == 'true');
|
|
}
|
|
};
|
|
|
|
// expose mousetrap to the global object
|
|
window.Mousetrap = Mousetrap;
|
|
|
|
// expose mousetrap as an AMD module
|
|
if (typeof define === 'function' && define.amd) {
|
|
define(Mousetrap);
|
|
}
|
|
}) ();
|
|
|
|
|
|
/**
|
|
* adds a bindGlobal method to Mousetrap that allows you to
|
|
* bind specific keyboard shortcuts that will still work
|
|
* inside a text input field
|
|
*
|
|
* usage:
|
|
* Mousetrap.bindGlobal('ctrl+s', _saveChanges);
|
|
*/
|
|
Mousetrap = (function(Mousetrap) {
|
|
var _global_callbacks = {},
|
|
_original_stop_callback = Mousetrap.stopCallback;
|
|
|
|
Mousetrap.stopCallback = function(e, element, combo) {
|
|
if (_global_callbacks[combo]) {
|
|
return false;
|
|
}
|
|
|
|
return _original_stop_callback(e, element, combo);
|
|
};
|
|
|
|
Mousetrap.bindGlobal = function(keys, callback, action) {
|
|
Mousetrap.bind(keys, callback, action);
|
|
|
|
if (keys instanceof Array) {
|
|
for (var i = 0; i < keys.length; i++) {
|
|
_global_callbacks[keys[i]] = true;
|
|
}
|
|
return;
|
|
}
|
|
|
|
_global_callbacks[keys] = true;
|
|
};
|
|
|
|
Mousetrap.unbindGlobal = function(keys) {
|
|
if (keys instanceof Array) {
|
|
for (var i = 0; i < keys.length; i++) {
|
|
_global_callbacks[keys[i]] = false;
|
|
}
|
|
return;
|
|
}
|
|
};
|
|
|
|
return Mousetrap;
|
|
}) (Mousetrap);
|