asia-weex-vue-render4light/src/directives/resize.js

Web renderer for weex project written in Vue DSL.

/*
 * 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.
 */
const valMap = {
  contain: 'contain',
  cover: 'cover',
  stretch: '100% 100%'
}
const vals = Object.keys(valMap)
const defaultVal = 'stretch'

export default {
  init (weex) {
    weex.__vue__.directive('weex-resize', function (el, binding) {
      if (el.tagName.toLowerCase() !== 'figure') {
        return
      }
      let value = binding.value
      const oldValue = binding.oldvalue
      if (value === oldValue) {
        return
      }
      if (vals.indexOf(value) <= -1) {
        value = defaultVal
      }
      el.style.backgroundSize = valMap[value]
    })
  }
}