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ImageGateway.js
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ImageGateway.js
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const sizeBuckets = [ 320, 640, 800, 1024, 1280, 1920, 2560, 2880 ],
actionParams = require( './../mobile.startup/actionParams' ),
util = require( './../mobile.startup/util' );
/**
* Gets the first size larger than or equal to the provided size
*
* @memberof ImageGateway
* @param {number} size
* @return {number}
*/
function findSizeBucket( size ) {
let i = 0;
while ( size > sizeBuckets[i] && i < sizeBuckets.length - 1 ) {
++i;
}
return sizeBuckets[i];
}
/**
* API for retrieving image thumbnails for a given page
*
* @param {Object} options Configuration options
* @param {mw.Api} options.api
* @private
*/
function ImageGateway( options ) {
this._cache = {};
this.api = options.api;
}
/**
* Get thumbnail via the API and cache it. Return the result from the cache if exists.
*
* @param {string} title Url of image
* @return {jQuery.Deferred} with the image info
*/
ImageGateway.prototype.getThumb = function ( title ) {
const cachedThumb = this._cache[title],
$window = util.getWindow(),
imageSizeMultiplier = ( window.devicePixelRatio && window.devicePixelRatio > 1 ) ?
window.devicePixelRatio : 1;
if ( !cachedThumb ) {
this._cache[title] = this.api.get( actionParams( {
prop: 'imageinfo',
titles: title,
iiprop: [ 'url', 'extmetadata' ],
// request an image devicePixelRatio times bigger than the reported screen size
// for retina displays and zooming
iiurlwidth: findSizeBucket( $window.width() * imageSizeMultiplier ),
iiurlheight: findSizeBucket( $window.height() * imageSizeMultiplier )
} ) ).then( function ( resp ) {
// imageinfo is undefined for missing pages.
if ( resp.query && resp.query.pages &&
resp.query.pages[0] && resp.query.pages[0].imageinfo ) {
return resp.query.pages[0].imageinfo[0];
}
throw new Error( 'The API failed to return any pages matching the titles.' );
} );
}
return this._cache[title];
};
ImageGateway._findSizeBucket = findSizeBucket;
module.exports = ImageGateway;

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ImageGateway.js (1 KB)

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