65 lines
1.7 KiB
JavaScript
65 lines
1.7 KiB
JavaScript
/**
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* @module ol/interaction/DoubleClickZoom
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*/
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import {inherits} from '../index.js';
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import MapBrowserEventType from '../MapBrowserEventType.js';
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import Interaction, {zoomByDelta} from '../interaction/Interaction.js';
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/**
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* @classdesc
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* Allows the user to zoom by double-clicking on the map.
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*
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* @constructor
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* @extends {ol.interaction.Interaction}
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* @param {olx.interaction.DoubleClickZoomOptions=} opt_options Options.
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* @api
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*/
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const DoubleClickZoom = function(opt_options) {
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const options = opt_options ? opt_options : {};
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/**
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* @private
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* @type {number}
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*/
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this.delta_ = options.delta ? options.delta : 1;
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Interaction.call(this, {
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handleEvent: handleEvent
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});
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/**
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* @private
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* @type {number}
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*/
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this.duration_ = options.duration !== undefined ? options.duration : 250;
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};
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inherits(DoubleClickZoom, Interaction);
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/**
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* Handles the {@link module:ol/MapBrowserEvent~MapBrowserEvent map browser event} (if it was a
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* doubleclick) and eventually zooms the map.
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* @param {module:ol/MapBrowserEvent~MapBrowserEvent} mapBrowserEvent Map browser event.
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* @return {boolean} `false` to stop event propagation.
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* @this {ol.interaction.DoubleClickZoom}
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*/
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function handleEvent(mapBrowserEvent) {
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let stopEvent = false;
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const browserEvent = mapBrowserEvent.originalEvent;
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if (mapBrowserEvent.type == MapBrowserEventType.DBLCLICK) {
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const map = mapBrowserEvent.map;
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const anchor = mapBrowserEvent.coordinate;
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const delta = browserEvent.shiftKey ? -this.delta_ : this.delta_;
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const view = map.getView();
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zoomByDelta(view, delta, anchor, this.duration_);
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mapBrowserEvent.preventDefault();
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stopEvent = true;
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}
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return !stopEvent;
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}
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export default DoubleClickZoom;
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