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support IntersectionObserver

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This commit is contained in:
Luke Pulverenti 2016-05-19 10:37:59 -04:00
parent 2d62dc8dd9
commit 48058e8fff
8 changed files with 135 additions and 62 deletions
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36
dashboard-ui/bower_components/emby-webcomponents/images/imagehelper.js vendored
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@ -88,12 +88,48 @@ define(['visibleinviewport', 'imageFetcher', 'layoutManager', 'events'], functio
target.addEventListener(type, handler, optionsOrCapture);
}
function unveilWithIntersection(images) {
var filledCount = 0;
var observer = new IntersectionObserver(function (entries) {
for (var j = 0, length2 = entries.length; j < length2; j++) {
var entry = entries[j];
var intersectionRatio = entry.intersectionRatio;
if (intersectionRatio) {
var target = entry.target;
observer.unobserve(target);
fillImage(target);
filledCount++;
}
}
if (filledCount >= images.length) {
//observer.disconnect();
}
},
{
/* Using default options. Details below */
}
);
// Start observing an element
for (var i = 0, length = images.length; i < length; i++) {
observer.observe(images[i]);
}
}
function unveilElements(images) {
if (!images.length) {
return;
}
if (window.IntersectionObserver) {
unveilWithIntersection(images);
return;
}
var filledImages = [];
var cancellationTokens = [];