githubmirror/Leaflet

src/layer/VideoOverlay.js
92 строки3 KB
ronikar
Improving the projection of video by setting videoElement style (#6038)
12 янв 2019, 15:58
12 янв 2019, 15:5862ee339
import {ImageOverlay} from './ImageOverlay';
import * as DomUtil from '../dom/DomUtil';
import * as Util from '../core/Util';

/*
 * @class VideoOverlay
 * @aka L.VideoOverlay
 * @inherits ImageOverlay
 *
 * Used to load and display a video player over specific bounds of the map. Extends `ImageOverlay`.
 *
 * A video overlay uses the [`<video>`](https://developer.mozilla.org/docs/Web/HTML/Element/video)
 * HTML5 element.
 *
 * @example
 *
 * ```js
 * var videoUrl = 'https://www.mapbox.com/bites/00188/patricia_nasa.webm',
 * 	videoBounds = [[ 32, -130], [ 13, -100]];
 * L.videoOverlay(videoUrl, videoBounds ).addTo(map);
 * ```
 */

export var VideoOverlay = ImageOverlay.extend({

	// @section
	// @aka VideoOverlay options
	options: {
		// @option autoplay: Boolean = true
		// Whether the video starts playing automatically when loaded.
		autoplay: true,

		// @option loop: Boolean = true
		// Whether the video will loop back to the beginning when played.
		loop: true,

		// @option keepAspectRatio: Boolean = true
		// Whether the video will save aspect ratio after the projection.
		// Relevant for supported browsers. Browser compatibility- https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit
		keepAspectRatio: true
	},

	_initImage: function () {
		var wasElementSupplied = this._url.tagName === 'VIDEO';
		var vid = this._image = wasElementSupplied ? this._url : DomUtil.create('video');

		DomUtil.addClass(vid, 'leaflet-image-layer');
		if (this._zoomAnimated) { DomUtil.addClass(vid, 'leaflet-zoom-animated'); }

		vid.onselectstart = Util.falseFn;
		vid.onmousemove = Util.falseFn;

		// @event load: Event
		// Fired when the video has finished loading the first frame
		vid.onloadeddata = Util.bind(this.fire, this, 'load');

		if (wasElementSupplied) {
			var sourceElements = vid.getElementsByTagName('source');
			var sources = [];
			for (var j = 0; j < sourceElements.length; j++) {
				sources.push(sourceElements[j].src);
			}

			this._url = (sourceElements.length > 0) ? sources : [vid.src];
			return;
		}

		if (!Util.isArray(this._url)) { this._url = [this._url]; }

		if (!this.options.keepAspectRatio && vid.style.hasOwnProperty('objectFit')) { vid.style['objectFit'] = 'fill'; }
		vid.autoplay = !!this.options.autoplay;
		vid.loop = !!this.options.loop;
		for (var i = 0; i < this._url.length; i++) {
			var source = DomUtil.create('source');
			source.src = this._url[i];
			vid.appendChild(source);
		}
	}

	// @method getElement(): HTMLVideoElement
	// Returns the instance of [`HTMLVideoElement`](https://developer.mozilla.org/docs/Web/API/HTMLVideoElement)
	// used by this overlay.
});


// @factory L.videoOverlay(video: String|Array|HTMLVideoElement, bounds: LatLngBounds, options?: VideoOverlay options)
// Instantiates an image overlay object given the URL of the video (or array of URLs, or even a video element) and the
// geographical bounds it is tied to.

export function videoOverlay(video, bounds, options) {
	return new VideoOverlay(video, bounds, options);
}