Source: modules/Legend.js

  1. /**
  2.  * @module modules/Legend.js
  3.  * @name Legend
  4.  * @copyright 2023 3Liz
  5.  * @license MPL-2.0
  6.  */
  8. import { LayerTreeGroupState } from '../modules/state/LayerTree.js'
  9. import { updateLayerTreeLayerSymbology, updateLayerTreeGroupLayersSymbology } from '../modules/action/Symbology.js';
  11. /**
  12.  * @class
  13.  * @name Legend
  14.  */
  15. export default class Legend {
  17.     /**
  18.      * Create a legend instance
  19.      * @param {LayerTreeGroupState} layerTree - Root tree layer group
  20.      */
  21.     constructor(layerTree) {
  22.         // Init all symbologies
  23.         if(layerTree.childrenCount === 0){
  24.             return;
  25.         }
  27.         updateLayerTreeGroupLayersSymbology(layerTree);
  29.         // Refresh symbology when a layer's style changes
  30.         layerTree.addListener(
  31.             evt => {
  32.                 updateLayerTreeLayerSymbology(layerTree.getTreeLayerByName(evt.name));
  33.             },['layer.style.changed']
  34.         );
  35.     }
  36. }