68 lines
1.8 KiB
JavaScript
68 lines
1.8 KiB
JavaScript
/**
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* Only load Maplibre bundles when layer is actually added, using dynamic imports
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*/
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BR.MaplibreGlLazyLoader = L.Layer.extend({
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initialize: function (options) {
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this.options = options;
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},
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onAdd: function (map) {
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if (!('maplibreGL' in L)) {
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this._load();
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} else {
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this._addGlLayer();
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}
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return this;
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},
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onRemove: function (map) {
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this._map.removeLayer(this.glLayer);
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this.glLayer = null;
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return this;
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},
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// needed when overlay, also requires `position: absolute` (see css)
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setZIndex: function (zIndex) {
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this.options.zIndex = zIndex;
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return this;
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},
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setOpacity: function (opacity) {
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if (this.glLayer) {
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const glMap = this.glLayer.getMaplibreMap();
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if (glMap.getLayer('hillshading')) {
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glMap.setPaintProperty('hillshading', 'hillshade-exaggeration', opacity);
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} else {
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glMap.getCanvas().style.opacity = opacity;
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}
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}
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},
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_load: async function () {
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await import('./maplibre-gl.js');
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await import('./leaflet-maplibre-gl.js');
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this._addGlLayer();
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},
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_addGlLayer: function () {
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this.glLayer = L.maplibreGL(this.options);
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// see LayersConfig.createLayer
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this.glLayer.getAttribution = function () {
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return this.options.mapLink;
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};
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this._map.addLayer(this.glLayer);
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this._updateZIndex();
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},
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_updateZIndex: function () {
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if (this.glLayer && this.glLayer.getContainer() && this.options.zIndex != null) {
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this.glLayer.getContainer().style.zIndex = this.options.zIndex;
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}
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},
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});
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BR.maplibreGlLazyLoader = function (options) {
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return new BR.MaplibreGlLazyLoader(options);
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};
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