/
ZoomToExtent.js
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/
ZoomToExtent.js
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/**
* @module ol/control/ZoomToExtent
*/
import Control from './Control.js';
import EventType from '../events/EventType.js';
import {CLASS_CONTROL, CLASS_UNSELECTABLE} from '../css.js';
import {fromUserExtent} from '../proj.js';
import {fromExtent as polygonFromExtent} from '../geom/Polygon.js';
/**
* @typedef {Object} Options
* @property {string} [className='ol-zoom-extent'] Class name.
* @property {HTMLElement|string} [target] Specify a target if you want the control
* to be rendered outside of the map's viewport.
* @property {string|HTMLElement} [label='E'] Text label to use for the button.
* Instead of text, also an element (e.g. a `span` element) can be used.
* @property {string} [tipLabel='Fit to extent'] Text label to use for the button tip.
* @property {import("../extent.js").Extent} [extent] The extent to zoom to. If undefined the validity
* extent of the view projection is used.
*/
/**
* @classdesc
* A button control which, when pressed, changes the map view to a specific
* extent. To style this control use the css selector `.ol-zoom-extent`.
*
* @api
*/
class ZoomToExtent extends Control {
/**
* @param {Options} [options] Options.
*/
constructor(options) {
options = options ? options : {};
super({
element: document.createElement('div'),
target: options.target,
});
/**
* @type {?import("../extent.js").Extent|null}
* @protected
*/
this.extent = options.extent ? options.extent : null;
const className =
options.className !== undefined ? options.className : 'ol-zoom-extent';
const label = options.label !== undefined ? options.label : 'E';
const tipLabel =
options.tipLabel !== undefined ? options.tipLabel : 'Fit to extent';
const button = document.createElement('button');
button.setAttribute('type', 'button');
button.title = tipLabel;
button.appendChild(
typeof label === 'string' ? document.createTextNode(label) : label,
);
button.addEventListener(
EventType.CLICK,
this.handleClick_.bind(this),
false,
);
const cssClasses =
className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;
const element = this.element;
element.className = cssClasses;
element.appendChild(button);
}
/**
* @param {MouseEvent} event The event to handle
* @private
*/
handleClick_(event) {
event.preventDefault();
this.handleZoomToExtent();
}
/**
* @protected
*/
handleZoomToExtent() {
const map = this.getMap();
const view = map.getView();
const extent = !this.extent
? view.getProjection().getExtent()
: fromUserExtent(this.extent, view.getProjection());
view.fitInternal(polygonFromExtent(extent));
}
}
export default ZoomToExtent;