| /* |
| * 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. |
| */ |
| |
| /** |
| * @fileOverview |
| * Task handler for communication between javascript and native. |
| */ |
| |
| const handlerMap = { |
| createBody: 'callCreateBody', |
| addElement: 'callAddElement', |
| removeElement: 'callRemoveElement', |
| moveElement: 'callMoveElement', |
| updateAttrs: 'callUpdateAttrs', |
| updateStyle: 'callUpdateStyle', |
| addEvent: 'callAddEvent', |
| removeEvent: 'callRemoveEvent' |
| } |
| |
| /** |
| * Create a task handler. |
| * @param {string} id |
| * @param {function} handler |
| * @return {function} taskHandler |
| */ |
| export function createHandler (id, handler) { |
| const defaultHandler = handler || global.callNative |
| |
| /* istanbul ignore if */ |
| if (typeof defaultHandler !== 'function') { |
| console.error('[JS Runtime] no default handler') |
| } |
| |
| return function taskHandler (tasks) { |
| /* istanbul ignore if */ |
| if (!Array.isArray(tasks)) { |
| tasks = [tasks] |
| } |
| for (let i = 0; i < tasks.length; i++) { |
| const returnValue = dispatchTask(id, tasks[i], defaultHandler) |
| if (returnValue === -1) { |
| return returnValue |
| } |
| } |
| } |
| } |
| |
| /** |
| * Check if there is a corresponding available handler in the environment. |
| * @param {string} module |
| * @param {string} method |
| * @return {boolean} |
| */ |
| function hasAvailableHandler (module, method) { |
| return module === 'dom' |
| && handlerMap[method] |
| && typeof global[handlerMap[method]] === 'function' |
| } |
| |
| /** |
| * Dispatch the task to the specified handler. |
| * @param {string} id |
| * @param {object} task |
| * @param {function} defaultHandler |
| * @return {number} signal returned from native |
| */ |
| function dispatchTask (id, task, defaultHandler) { |
| const { module, method, args } = task |
| |
| if (hasAvailableHandler(module, method)) { |
| return global[handlerMap[method]](id, ...args, '-1') |
| } |
| |
| return defaultHandler(id, [task], '-1') |
| } |