MapGIS Client for JavaScript API

import FeatureRender from '../base/FeatureRender'
import { defaultValue } from '../util'
import { LayerView } from './index'

class BaseGraphicsLayerView extends LayerView {
  constructor(options) {
    super(options)
    this.render = defaultValue(options.render, new FeatureRender())
    this._initHandlers()
  }

  /**
   * @description: 初始化监听
   * @return {*}
   */
  _initHandlers() {
    this._layerChangeAction = this._layerChangeAction.bind(this)
    this.layer.on('set', this._layerChangeAction)
  }

  /**
   * @description: 移除监听
   * @return {*}
   */
  _removeHandlers() {
    this.layer.off('set', this._layerChangeAction)
  }

  /**
   * @description: 图层变化Action
   * @param {*} event
   * @return {*}
   */
  _layerChangeAction(event) {
    this._featureCollectionChangeAction(event)
  }

  /**
   * @description: 要素变化Action
   * @param {*} event
   * @return {*}
   */
  _featureCollectionChangeAction(event) {
    const eventPath = event.eventPath || []
    const { key, value } = event.eventData
    const sourceEventData = event.sourceEventData
    // 处理要素刷新机制
    if (key === 'graphics') {
      const graphics = value
      if (eventPath.length <= 0 || !graphics) return
      if (eventPath.length === 1) {
        // 事件路径为['graphics']，表示刷新数据
        const graphics = value
        this.render.clear(this.innerLayer)
        this.render.drawFeature(this.innerLayer, graphics.items)
      } else if (eventPath.length > 1) {
        // 获取到要素
        const featureKey = eventPath[1]
        const feature = graphics.getFeatureById(featureKey)
        if (!feature) return
        if (eventPath.length > 2) {
          const updateType = eventPath[2]
          const updateDetail = {
            geometryUpdated: null,
            symbolUpdated: null
          }
          if (updateType === 'symbol') {
            updateDetail.symbolUpdated = sourceEventData
          } else if (updateType === 'geometry') {
            updateDetail.geometryUpdated = sourceEventData
          }
          this.render.updateFeature(this.innerLayer, [feature], [updateDetail])
        }
      }
    }
  }
}

export default BaseGraphicsLayerView