olcs
Version:
OpenLayers Cesium integration and plugin library
234 lines • 17.1 kB
JavaScript
import { unByKey as olObservableUnByKey } from 'ol/Observable.js';
import LayerGroup from 'ol/layer/Group.js';
import { getUid } from './util.js';
export default class AbstractSynchronizer {
map;
view;
scene;
olLayers;
mapLayerGroup;
/**
* Map of OpenLayers layer ids (from getUid) to the Cesium ImageryLayers.
* Null value means, that we are unable to create equivalent layers.
*/
layerMap = {};
/**
* Map of listen keys for OpenLayers layer layers ids (from getUid).
*/
olLayerListenKeys = {};
/**
* Map of listen keys for OpenLayers layer groups ids (from getUid).
*/
olGroupListenKeys_ = {};
constructor(map, scene) {
this.map = map;
this.view = map.getView();
this.scene = scene;
this.olLayers = map.getLayerGroup().getLayers();
this.mapLayerGroup = map.getLayerGroup();
}
/**
* Destroy all and perform complete synchronization of the layers.
*/
synchronize() {
this.destroyAll();
this.addLayers_(this.mapLayerGroup);
}
/**
* Order counterparts using the same algorithm as the Openlayers renderer:
* z-index then original sequence order.
*/
orderLayers() {
// Ordering logics is handled in subclasses.
}
/**
* Add a layer hierarchy.
* @param root
*/
addLayers_(root) {
const fifo = [
{
layer: root,
parents: [],
},
];
while (fifo.length > 0) {
const olLayerWithParents = fifo.splice(0, 1)[0];
const olLayer = olLayerWithParents.layer;
const olLayerId = getUid(olLayer).toString();
this.olLayerListenKeys[olLayerId] = [];
console.assert(!this.layerMap[olLayerId]);
let cesiumObjects = null;
if (olLayer instanceof LayerGroup) {
this.listenForGroupChanges_(olLayer);
if (olLayer !== this.mapLayerGroup) {
cesiumObjects =
this.createSingleLayerCounterparts(olLayerWithParents);
}
if (!cesiumObjects) {
olLayer.getLayers().forEach((l) => {
if (l) {
const newOlLayerWithParents = {
layer: l,
parents: olLayer === this.mapLayerGroup
? []
: [olLayerWithParents.layer].concat(olLayerWithParents.parents),
};
fifo.push(newOlLayerWithParents);
}
});
}
}
else {
cesiumObjects = this.createSingleLayerCounterparts(olLayerWithParents);
if (!cesiumObjects) {
// keep an eye on the layers that once failed to be added (might work when the layer is updated)
// for example when a source is set after the layer is added to the map
const layerId = olLayerId;
const layerWithParents = olLayerWithParents;
const onLayerChange = () => {
const cesiumObjs = this.createSingleLayerCounterparts(layerWithParents);
if (cesiumObjs) {
// unsubscribe event listener
layerWithParents.layer.un('change', onLayerChange);
this.addCesiumObjects_(cesiumObjs, layerId, layerWithParents.layer);
this.orderLayers();
}
};
this.olLayerListenKeys[olLayerId].push(layerWithParents.layer.on('change', onLayerChange));
}
}
// add Cesium layers
if (cesiumObjects) {
this.addCesiumObjects_(cesiumObjects, olLayerId, olLayer);
}
}
this.orderLayers();
}
/**
* Add Cesium objects.
* @param cesiumObjects
* @param layerId
* @param layer
*/
addCesiumObjects_(cesiumObjects, layerId, layer) {
this.layerMap[layerId] = cesiumObjects;
this.olLayerListenKeys[layerId].push(layer.on('change:zIndex', () => this.orderLayers()));
cesiumObjects.forEach((cesiumObject) => {
this.addCesiumObject(cesiumObject);
});
}
/**
* Remove and destroy a single layer.
* @param {ol.layer.Layer} layer
* @return {boolean} counterpart destroyed
*/
removeAndDestroySingleLayer_(layer) {
const uid = getUid(layer).toString();
const counterparts = this.layerMap[uid];
if (counterparts) {
counterparts.forEach((counterpart) => {
this.removeSingleCesiumObject(counterpart, false);
this.destroyCesiumObject(counterpart);
});
this.olLayerListenKeys[uid].forEach(olObservableUnByKey);
delete this.olLayerListenKeys[uid];
}
delete this.layerMap[uid];
return !!counterparts;
}
/**
* Unlisten a single layer group.
* @param group
*/
unlistenSingleGroup_(group) {
if (group === this.mapLayerGroup) {
return;
}
const uid = getUid(group).toString();
const keys = this.olGroupListenKeys_[uid];
keys.forEach((key) => {
olObservableUnByKey(key);
});
delete this.olGroupListenKeys_[uid];
delete this.layerMap[uid];
}
/**
* Remove layer hierarchy.
* @param root
*/
removeLayer_(root) {
if (root) {
const fifo = [root];
while (fifo.length > 0) {
const olLayer = fifo.splice(0, 1)[0];
const done = this.removeAndDestroySingleLayer_(olLayer);
if (olLayer instanceof LayerGroup) {
this.unlistenSingleGroup_(olLayer);
if (!done) {
// No counterpart for the group itself so removing
// each of the child layers.
olLayer.getLayers().forEach((l) => {
fifo.push(l);
});
}
}
}
}
}
/**
* Register listeners for single layer group change.
* @param group
*/
listenForGroupChanges_(group) {
const uuid = getUid(group).toString();
console.assert(this.olGroupListenKeys_[uuid] === undefined);
const listenKeyArray = [];
this.olGroupListenKeys_[uuid] = listenKeyArray;
// only the keys that need to be relistened when collection changes
let contentKeys = [];
const listenAddRemove = function () {
const collection = group.getLayers();
if (collection) {
contentKeys = [
collection.on('add', (event) => {
this.addLayers_(event.element);
}),
collection.on('remove', (event) => {
this.removeLayer_(event.element);
}),
];
listenKeyArray.push(...contentKeys);
}
}.bind(this);
listenAddRemove();
listenKeyArray.push(group.on('change:layers', (e) => {
contentKeys.forEach((el) => {
const i = listenKeyArray.indexOf(el);
if (i >= 0) {
listenKeyArray.splice(i, 1);
}
olObservableUnByKey(el);
});
listenAddRemove();
}));
}
/**
* Destroys all the created Cesium objects.
*/
destroyAll() {
this.removeAllCesiumObjects(true); // destroy
let objKey;
for (objKey in this.olGroupListenKeys_) {
const keys = this.olGroupListenKeys_[objKey];
keys.forEach(olObservableUnByKey);
}
for (objKey in this.olLayerListenKeys) {
this.olLayerListenKeys[objKey].forEach(olObservableUnByKey);
}
this.olGroupListenKeys_ = {};
this.olLayerListenKeys = {};
this.layerMap = {};
}
}
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