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node-red/editor/js/events.js

54 lines
1.5 KiB
JavaScript

/**
* Copyright 2015, 2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
RED.events = (function() {
var handlers = {};
function on(evt,func) {
handlers[evt] = handlers[evt]||[];
handlers[evt].push(func);
}
function off(evt,func) {
var handler = handlers[evt];
if (handler) {
for (var i=0;i<handler.length;i++) {
if (handler[i] === func) {
handler.splice(i,1);
return;
}
}
}
}
function emit(evt,arg) {
if (handlers[evt]) {
for (var i=0;i<handlers[evt].length;i++) {
try {
handlers[evt][i](arg);
} catch(err) {
console.log("RED.events.emit error: ["+evt+"] "+(err.toString()));
console.log(err);
}
}
}
}
return {
on: on,
off: off,
emit: emit
}
})();