| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| /** |
| * globalEvent API: |
| * @doc http://weex.apache.org/cn/references/modules/globalevent.html |
| */ |
| // track varies kinds of events and listeners. |
| const handlerTraker = {} |
| |
| const globalEvent = { |
| /** |
| * addEventListener |
| * NOTE: one callback can only be bound to the same event once. Bind a callback twice doesn't |
| * mean it will be called twice when the event fired once. |
| * @param {string} evt - the event name to add a listener on. |
| */ |
| addEventListener (evt, callback) { |
| if (!callback) { |
| if (process.env.NODE_ENV === 'development') { |
| console.error(`[vue-render] missing callback arg in globalEvent.addEventListener.`) |
| } |
| return |
| } |
| let handlers = handlerTraker[evt] |
| if (!handlers) { |
| handlers = handlerTraker[evt] = [] |
| } |
| const len = handlers.length |
| for (let i = 0; i < len; i++) { |
| if (handlers[i] === callback) { |
| // this callback is already bound. no need to bind it again. |
| return |
| } |
| } |
| handlers.push(callback) |
| document.addEventListener(evt, callback) |
| }, |
| |
| /** |
| * removeEventListener |
| * NOTE: remove all the event handlers for the specified event type. |
| * @param {string} evt - the event name to remove a listener from. |
| */ |
| removeEventListener (evt) { |
| const handlers = handlerTraker[evt] |
| if (!handlers) { |
| // evt handlers has been already removed. |
| return |
| } |
| handlers.forEach(cb => document.removeEventListener(evt, cb)) |
| delete handlerTraker[evt] |
| } |
| } |
| |
| export default { |
| init (weex) { |
| weex.registerModule('globalEvent', globalEvent) |
| } |
| } |