--- /dev/null
+// keymaster.js
+// (c) 2011-2013 Thomas Fuchs
+// keymaster.js may be freely distributed under the MIT license.
+
+;(function(global){
+ var k,
+ _handlers = {},
+ _mods = { 16: false, 18: false, 17: false, 91: false },
+ _scope = 'all',
+ // modifier keys
+ _MODIFIERS = {
+ '⇧': 16, shift: 16,
+ '⌥': 18, alt: 18, option: 18,
+ '⌃': 17, ctrl: 17, control: 17,
+ '⌘': 91, command: 91
+ },
+ // special keys
+ _MAP = {
+ backspace: 8, tab: 9, clear: 12,
+ enter: 13, 'return': 13,
+ esc: 27, escape: 27, space: 32,
+ left: 37, up: 38,
+ right: 39, down: 40,
+ del: 46, 'delete': 46,
+ home: 36, end: 35,
+ pageup: 33, pagedown: 34,
+ ',': 188, '.': 190, '/': 191,
+ '`': 192, '-': 189, '=': 187,
+ ';': 186, '\'': 222,
+ '[': 219, ']': 221, '\\': 220
+ },
+ code = function(x){
+ return _MAP[x] || x.toUpperCase().charCodeAt(0);
+ },
+ _downKeys = [];
+
+ for(k=1;k<20;k++) _MAP['f'+k] = 111+k;
+
+ // IE doesn't support Array#indexOf, so have a simple replacement
+ function index(array, item){
+ var i = array.length;
+ while(i--) if(array[i]===item) return i;
+ return -1;
+ }
+
+ // for comparing mods before unassignment
+ function compareArray(a1, a2) {
+ if (a1.length != a2.length) return false;
+ for (var i = 0; i < a1.length; i++) {
+ if (a1[i] !== a2[i]) return false;
+ }
+ return true;
+ }
+
+ var modifierMap = {
+ 16:'shiftKey',
+ 18:'altKey',
+ 17:'ctrlKey',
+ 91:'metaKey'
+ };
+ function updateModifierKey(event) {
+ for(k in _mods) _mods[k] = event[modifierMap[k]];
+ };
+
+ // handle keydown event
+ function dispatch(event) {
+ var key, handler, k, i, modifiersMatch, scope;
+ key = event.keyCode;
+
+ if (index(_downKeys, key) == -1) {
+ _downKeys.push(key);
+ }
+
+ // if a modifier key, set the key.<modifierkeyname> property to true and return
+ if(key == 93 || key == 224) key = 91; // right command on webkit, command on Gecko
+ if(key in _mods) {
+ _mods[key] = true;
+ // 'assignKey' from inside this closure is exported to window.key
+ for(k in _MODIFIERS) if(_MODIFIERS[k] == key) assignKey[k] = true;
+ return;
+ }
+ updateModifierKey(event);
+
+ // see if we need to ignore the keypress (filter() can can be overridden)
+ // by default ignore key presses if a select, textarea, or input is focused
+ if(!assignKey.filter.call(this, event)) return;
+
+ // abort if no potentially matching shortcuts found
+ if (!(key in _handlers)) return;
+
+ scope = getScope();
+
+ // for each potential shortcut
+ for (i = 0; i < _handlers[key].length; i++) {
+ handler = _handlers[key][i];
+
+ // see if it's in the current scope
+ if(handler.scope == scope || handler.scope == 'all'){
+ // check if modifiers match if any
+ modifiersMatch = handler.mods.length > 0;
+ for(k in _mods)
+ if((!_mods[k] && index(handler.mods, +k) > -1) ||
+ (_mods[k] && index(handler.mods, +k) == -1)) modifiersMatch = false;
+ // call the handler and stop the event if neccessary
+ if((handler.mods.length == 0 && !_mods[16] && !_mods[18] && !_mods[17] && !_mods[91]) || modifiersMatch){
+ if(handler.method(event, handler)===false){
+ if(event.preventDefault) event.preventDefault();
+ else event.returnValue = false;
+ if(event.stopPropagation) event.stopPropagation();
+ if(event.cancelBubble) event.cancelBubble = true;
+ }
+ }
+ }
+ }
+ };
+
+ // unset modifier keys on keyup
+ function clearModifier(event){
+ var key = event.keyCode, k,
+ i = index(_downKeys, key);
+
+ // remove key from _downKeys
+ if (i >= 0) {
+ _downKeys.splice(i, 1);
+ }
+
+ if(key == 93 || key == 224) key = 91;
+ if(key in _mods) {
+ _mods[key] = false;
+ for(k in _MODIFIERS) if(_MODIFIERS[k] == key) assignKey[k] = false;
+ }
+ };
+
+ function resetModifiers() {
+ for(k in _mods) _mods[k] = false;
+ for(k in _MODIFIERS) assignKey[k] = false;
+ };
+
+ // parse and assign shortcut
+ function assignKey(key, scope, method){
+ var keys, mods;
+ keys = getKeys(key);
+ if (method === undefined) {
+ method = scope;
+ scope = 'all';
+ }
+
+ // for each shortcut
+ for (var i = 0; i < keys.length; i++) {
+ // set modifier keys if any
+ mods = [];
+ key = keys[i].split('+');
+ if (key.length > 1){
+ mods = getMods(key);
+ key = [key[key.length-1]];
+ }
+ // convert to keycode and...
+ key = key[0]
+ key = code(key);
+ // ...store handler
+ if (!(key in _handlers)) _handlers[key] = [];
+ _handlers[key].push({ shortcut: keys[i], scope: scope, method: method, key: keys[i], mods: mods });
+ }
+ };
+
+ // unbind all handlers for given key in current scope
+ function unbindKey(key, scope) {
+ var multipleKeys, keys,
+ mods = [],
+ i, j, obj;
+
+ multipleKeys = getKeys(key);
+
+ for (j = 0; j < multipleKeys.length; j++) {
+ keys = multipleKeys[j].split('+');
+
+ if (keys.length > 1) {
+ mods = getMods(keys);
+ key = keys[keys.length - 1];
+ }
+
+ key = code(key);
+
+ if (scope === undefined) {
+ scope = getScope();
+ }
+ if (!_handlers[key]) {
+ return;
+ }
+ for (i = 0; i < _handlers[key].length; i++) {
+ obj = _handlers[key][i];
+ // only clear handlers if correct scope and mods match
+ if (obj.scope === scope && compareArray(obj.mods, mods)) {
+ _handlers[key][i] = {};
+ }
+ }
+ }
+ };
+
+ // Returns true if the key with code 'keyCode' is currently down
+ // Converts strings into key codes.
+ function isPressed(keyCode) {
+ if (typeof(keyCode)=='string') {
+ keyCode = code(keyCode);
+ }
+ return index(_downKeys, keyCode) != -1;
+ }
+
+ function getPressedKeyCodes() {
+ return _downKeys.slice(0);
+ }
+
+ function filter(event){
+ var tagName = (event.target || event.srcElement).tagName;
+ // ignore keypressed in any elements that support keyboard data input
+ return !(tagName == 'INPUT' || tagName == 'SELECT' || tagName == 'TEXTAREA');
+ }
+
+ // initialize key.<modifier> to false
+ for(k in _MODIFIERS) assignKey[k] = false;
+
+ // set current scope (default 'all')
+ function setScope(scope){ _scope = scope || 'all' };
+ function getScope(){ return _scope || 'all' };
+
+ // delete all handlers for a given scope
+ function deleteScope(scope){
+ var key, handlers, i;
+
+ for (key in _handlers) {
+ handlers = _handlers[key];
+ for (i = 0; i < handlers.length; ) {
+ if (handlers[i].scope === scope) handlers.splice(i, 1);
+ else i++;
+ }
+ }
+ };
+
+ // abstract key logic for assign and unassign
+ function getKeys(key) {
+ var keys;
+ key = key.replace(/\s/g, '');
+ keys = key.split(',');
+ if ((keys[keys.length - 1]) == '') {
+ keys[keys.length - 2] += ',';
+ }
+ return keys;
+ }
+
+ // abstract mods logic for assign and unassign
+ function getMods(key) {
+ var mods = key.slice(0, key.length - 1);
+ for (var mi = 0; mi < mods.length; mi++)
+ mods[mi] = _MODIFIERS[mods[mi]];
+ return mods;
+ }
+
+ // cross-browser events
+ function addEvent(object, event, method) {
+ if (object.addEventListener)
+ object.addEventListener(event, method, false);
+ else if(object.attachEvent)
+ object.attachEvent('on'+event, function(){ method(window.event) });
+ };
+
+ // set the handlers globally on document
+ addEvent(document, 'keydown', function(event) { dispatch(event) }); // Passing _scope to a callback to ensure it remains the same by execution. Fixes #48
+ addEvent(document, 'keyup', clearModifier);
+
+ // reset modifiers to false whenever the window is (re)focused.
+ addEvent(window, 'focus', resetModifiers);
+
+ // store previously defined key
+ var previousKey = global.key;
+
+ // restore previously defined key and return reference to our key object
+ function noConflict() {
+ var k = global.key;
+ global.key = previousKey;
+ return k;
+ }
+
+ // set window.key and window.key.set/get/deleteScope, and the default filter
+ global.key = assignKey;
+ global.key.setScope = setScope;
+ global.key.getScope = getScope;
+ global.key.deleteScope = deleteScope;
+ global.key.filter = filter;
+ global.key.isPressed = isPressed;
+ global.key.getPressedKeyCodes = getPressedKeyCodes;
+ global.key.noConflict = noConflict;
+ global.key.unbind = unbindKey;
+
+ if(typeof module !== 'undefined') module.exports = key;
+
+})(this);
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