geopf-extensions-openlayers
Version:
French Geoportal Extensions for OpenLayers libraries
247 lines (217 loc) • 8.52 kB
JavaScript
// import CSS
import "../../CSS/Controls/Attribution/GPFattribution.css";
// import "../../CSS/Controls/Attribution/GPFattributionStyle.css";
// import OpenLayers
import Attribution from "ol/control/Attribution";
import { transformExtent as olTransformExtentProj } from "ol/proj";
// import local
import LayerUtils from "../../Utils/LayerUtils";
import Logger from "../../Utils/LoggerByDefault";
var logger = Logger.getLogger("geoportalattribution");
/**
* @classdesc
* OpenLayers Control to manage Originators for layer resources
*
* @constructor
* @extends {ol.control.Attribution}
* @alias ol.control.GeoportalAttribution
* @type {ol.control.GeoportalAttribution}
* @param {Object} options - ol.control.Attribution options (see {@link http://openlayers.org/en/latest/apidoc/ol.control.Attribution.html ol.Control.Attribution})
* @fires attributions:update
* @example
* var attribution = new ol.control.GeoportalAttribution({
* collapsed : false
* });
* map.addControl(attribution);
* // listeners for attributions update :
* attribution.on("attributions:update", function (e) {});
*/
var GeoportalAttribution = class GeoportalAttribution extends Attribution {
/**
* See {@link ol.control.GeoportalAttribution}
* @module GeoportalAttribution
* @alias module:~controls/GeoportalAttribution
* @param {*} options - options
* @example
* import GeoportalAttribution from "gpf-ext-ol/controls/GeoportalAttribution"
* ou
* import { GeoportalAttribution } from "gpf-ext-ol"
*/
constructor (options) {
options = options || {};
// Attributions are not collapsible for ol/source/OSM except if ...
options.collapsible = true;
options.collapsed = true;
super(options);
if (!(this instanceof GeoportalAttribution)) {
throw new TypeError("ERROR CLASS_CONSTRUCTOR");
}
return this;
}
/**
* Overload setMap function, that enables to catch map events,
* such as movend events.
*
* @param {ol.Map} map - Map.
*/
setMap (map) {
if (map != null) {
// Remove default ol.control.Attribution
var ctrls = map.getControls();
ctrls.forEach(
(ctrl) => {
if (ctrl instanceof GeoportalAttribution) {
return;
}
if (ctrl) {
var classList = ctrl.element.classList;
for (var i = 0; i < classList.length; i++) {
if (classList[i] === "ol-attribution") {
ctrls.remove(ctrl);
break;
}
}
}
}
);
// on récupère les attributions des couches déjà ajoutées à la carte.
this._updateAttributions(map);
// At every map movement, layers attributions have to be updated,
// according to map and originators zoom and extent.
map.on(
"moveend",
() => {
this._updateAttributions(map);
}
);
map.getLayers().on(
"add",
() => {
this._updateAttributions(map);
}
);
map.getLayers().on(
"remove",
() => {
this._updateAttributions(map);
}
);
}
super.setMap(map);
}
/**
* Update map layers attributions
*
* @param {ol.Map} map - Map.
* @private
*/
_updateAttributions (map) {
// get map parameters
var mapAttributions = {};
var view = map.getView();
// extent, then convert to geographical coordinates
var extent = view.calculateExtent(map.getSize());
var mapProjection = view.getProjection().getCode();
var geoExtent = olTransformExtentProj(extent, mapProjection, "EPSG:4326");
// transform extent from [minx, miny, maxx, maxy] to [maxy, minx, miny, maxx]
var standardExtent = [geoExtent[3], geoExtent[0], geoExtent[1], geoExtent[2]];
// zoom
var zoom = view.getZoom();
// layers
var layers = map.getLayers().getArray();
// info : This option suppresses warnings about functions inside of loops.
/* jshint loopfunc: true */
// loop on layers to get their originators, if there is at least one originator, and if layer is visible.
for (var i = 0; i < layers.length; i++) {
// distinguish case of ol.layer.Group (which is made up of layers with their own source)
// and other ol.layer (with their own source)
if (layers[i].getSource) {
// single ol.layer
this._updateLayerAttributions(layers[i], mapAttributions, standardExtent, mapProjection, zoom);
} else if (layers[i].getLayers) {
// ol.layer.Group
var lyrs = layers[i].getLayers();
lyrs.forEach(
(lyr) => {
if (lyr.getSource) {
this._updateLayerAttributions(lyr, mapAttributions, standardExtent, mapProjection, zoom);
} else {
logger.log("cannot find layer source in layergroup ", layers[i]);
}
}
);
}
}
}
/**
* Update a layer attributions
*
* @param {ol.layer} layer - layer
* @param {Object} mapAttributions - object recensing attributions already added, to prevent displaying twice the same producer
* @param {Array} mapExtent - map current extent
* @param {String} mapCrs - map current crs
* @param {Number} mapZoom - map current zoom
* @private
*/
_updateLayerAttributions (layer, mapAttributions, mapExtent, mapCrs, mapZoom) {
if (!layer) {
logger.trace("layer is null !?");
return;
}
var src = layer.getSource();
if (!src) {
logger.trace("source is not yet loaded !");
return;
}
if (!mapAttributions) {
mapAttributions = {};
}
var attributions = [];
var visibility = layer.getVisible();
var originators = src._originators;
// info : clean previous attributions ONLY for Geoportal Layers (when src._originators is defined)
if (typeof originators !== "undefined") {
src.setAttributions(); // clean
}
if (originators && visibility) {
// get layer's attributions array
var layerAttributions = LayerUtils.getAttributions({
extent : mapExtent,
crs : mapCrs,
zoom : mapZoom,
visibility : visibility,
originators : originators
});
for (var j = 0; j < layerAttributions.length; j++) {
var attributionj = layerAttributions[j];
// check that this attribution hasn't been added yet for another layer
if (!mapAttributions.hasOwnProperty(attributionj)) {
// add attribution html
attributions.push(attributionj);
// add attribution to mapAttributions, to manage all layers attributions
mapAttributions[attributionj] = true;
}
};
// update source attribution
if (attributions.length !== 0) {
src.setAttributions(attributions);
/**
* event triggered when the attributions are updated
*
* @event attributions:update
* @type Object
* @property {Array} attributions - list of attributions
*/
this.dispatchEvent({
type : "attributions:update",
attributions : attributions
});
}
}
}
};
export default GeoportalAttribution;
// Expose GeoportalAttribution as ol.control.GeoportalAttribution (for a build bundle)
if (window.ol && window.ol.control) {
window.ol.control.GeoportalAttribution = GeoportalAttribution;
}