Method _setUniqueId

src/common/mapping/MapStyle.js:99–142

(style)

    }

    _setUniqueId(style) {
      const layersToMap = JSON.parse(JSON.stringify(style.layers));
      const nextSources = {};
      const sourcesIdChangedMap = {};
      const layerIdToChange = [];
      const timestamp = `_${+new Date()}`;
      for (const sourceId in style.sources) {
        let nextSourceId = sourceId;
        if (this.map.getSource(sourceId)) {
          nextSourceId = sourceId + timestamp;
        }
        sourcesIdChangedMap[nextSourceId] = sourceId;
        nextSources[nextSourceId] = style.sources[sourceId];
        for (const layer of layersToMap) {
          if (layer.source === sourceId) {
            layer.source = nextSourceId;
          }
        }
      }
      for (const layer of layersToMap) {
        const originId = layer.id;
        let reused;
        const existLayer = this.map.getLayer(layer.id);
        if (existLayer) {
          // 此时用 getSource(xx).tiles 为空
          if (
            this.options.checkSameLayer &&
            isSameRasterLayer(nextSources[layer.source], this.map.getStyle().sources[existLayer.source])
          ) {
            reused = true;
            layer.source = sourcesIdChangedMap[layer.source];
          } else {
            const layerId = layer.id + timestamp;
            layer.id = layerId;
          }
        }
        layerIdToChange.push({ originId: originId, renderId: layer.id, reused });
      }
      return {
        sources: nextSources,
        layers: layersToMap,
        layerIdMapList: layerIdToChange
      };
    }

    _generateAppreciableLayers() {
      return this.mapOptions.style.layers.reduce((layers, layer) => {