mirror of
https://github.com/jellyfin/jellyfin-web
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41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
define(['dom'], function (dom) {
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'use strict';
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/**
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* Copyright 2012, Digital Fusion
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* Licensed under the MIT license.
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* http://teamdf.com/jquery-plugins/license/
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*
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* @author Sam Sehnert
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* @desc A small plugin that checks whether elements are within
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* the user visible viewport of a web browser.
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* only accounts for vertical position, not horizontal.
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*/
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function visibleInViewport(elem, partial, thresholdX, thresholdY) {
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thresholdX = thresholdX || 0;
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thresholdY = thresholdY || 0;
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if (!elem.getBoundingClientRect) {
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return true;
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}
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var windowSize = dom.getWindowSize();
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var vpWidth = windowSize.innerWidth;
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var vpHeight = windowSize.innerHeight;
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// Use this native browser method, if available.
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var rec = elem.getBoundingClientRect();
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var tViz = rec.top >= 0 && rec.top < vpHeight + thresholdY;
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var bViz = rec.bottom > 0 && rec.bottom <= vpHeight + thresholdY;
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var lViz = rec.left >= 0 && rec.left < vpWidth + thresholdX;
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var rViz = rec.right > 0 && rec.right <= vpWidth + thresholdX;
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var vVisible = partial ? tViz || bViz : tViz && bViz;
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var hVisible = partial ? lViz || rViz : lViz && rViz;
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return vVisible && hVisible;
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}
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return visibleInViewport;
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});
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