72 lines
1.8 KiB
JavaScript
72 lines
1.8 KiB
JavaScript
/**
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* @module ol/interaction/DoubleClickZoom
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*/
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import MapBrowserEventType from '../MapBrowserEventType.js';
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import Interaction, {zoomByDelta} from './Interaction.js';
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/**
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* @typedef {Object} Options
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* @property {number} [duration=250] Animation duration in milliseconds.
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* @property {number} [delta=1] The zoom delta applied on each double click.
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*/
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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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* @api
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*/
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class DoubleClickZoom extends Interaction {
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/**
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* @param {Options=} opt_options Options.
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*/
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constructor(opt_options) {
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super({
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handleEvent: handleEvent
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});
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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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/**
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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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}
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/**
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* Handles the {@link module:ol/MapBrowserEvent map browser event} (if it was a
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* doubleclick) and eventually zooms the map.
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* @param {import("../MapBrowserEvent.js").default} mapBrowserEvent Map browser event.
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* @return {boolean} `false` to stop event propagation.
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* @this {DoubleClickZoom}
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*/
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function handleEvent(mapBrowserEvent) {
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let stopEvent = false;
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if (mapBrowserEvent.type == MapBrowserEventType.DBLCLICK) {
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const browserEvent = /** @type {MouseEvent} */ (mapBrowserEvent.originalEvent);
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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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