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Remove lazyloader-scroll

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MrTimscampi 2020-05-07 11:02:47 +02:00
parent 7dc1cf771d
commit 1e4dd8ec93
1 changed files with 0 additions and 185 deletions
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185
src/components/lazyloader/lazyloader-scroll.js
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@ -1,185 +0,0 @@
define(['visibleinviewport', 'dom', 'browser'], function (visibleinviewport, dom, browser) {
'use strict';
var thresholdX;
var thresholdY;
function resetThresholds() {
var threshold = 0.3;
thresholdX = screen.availWidth * threshold;
thresholdY = screen.availHeight * threshold;
}
function resetThresholdsOnTimer() {
setTimeout(resetThresholds, 500);
}
if (browser.iOS) {
dom.addEventListener(window, 'orientationchange', resetThresholdsOnTimer, { passive: true });
dom.addEventListener(window, 'resize', resetThresholdsOnTimer, { passive: true });
} else {
dom.addEventListener(window, 'orientationchange', resetThresholds, { passive: true });
dom.addEventListener(window, 'resize', resetThresholds, { passive: true });
}
resetThresholds();
function isVisible(elem) {
return visibleinviewport(elem, true, thresholdX, thresholdY);
}
var wheelEvent = (document.implementation.hasFeature('Event.wheel', '3.0') ? 'wheel' : 'mousewheel');
var self = {};
function cancelAll(tokens) {
for (var i = 0, length = tokens.length; i < length; i++) {
tokens[i] = true;
}
}
function unveilElementsInternal(instance, callback) {
var unveiledElements = [];
var cancellationTokens = [];
var loadedCount = 0;
function unveilInternal(tokenIndex) {
var anyFound = false;
var out = false;
var elements = instance.elements;
// TODO: This out construct assumes left to right, top to bottom
for (var i = 0, length = elements.length; i < length; i++) {
if (cancellationTokens[tokenIndex]) {
return;
}
if (unveiledElements[i]) {
continue;
}
var elem = elements[i];
if (!out && isVisible(elem)) {
anyFound = true;
unveiledElements[i] = true;
callback(elem);
loadedCount++;
} else {
if (anyFound) {
out = true;
}
}
}
if (loadedCount >= elements.length) {
dom.removeEventListener(document, 'focus', unveil, {
capture: true,
passive: true
});
dom.removeEventListener(document, 'scroll', unveil, {
capture: true,
passive: true
});
dom.removeEventListener(document, wheelEvent, unveil, {
capture: true,
passive: true
});
dom.removeEventListener(window, 'resize', unveil, {
capture: true,
passive: true
});
}
}
function unveil() {
cancelAll(cancellationTokens);
var index = cancellationTokens.length;
cancellationTokens.length++;
setTimeout(function () {
unveilInternal(index);
}, 1);
}
dom.addEventListener(document, 'focus', unveil, {
capture: true,
passive: true
});
dom.addEventListener(document, 'scroll', unveil, {
capture: true,
passive: true
});
dom.addEventListener(document, wheelEvent, unveil, {
capture: true,
passive: true
});
dom.addEventListener(window, 'resize', unveil, {
capture: true,
passive: true
});
unveil();
}
function LazyLoader(options) {
this.options = options;
}
LazyLoader.prototype.createObserver = function () {
unveilElementsInternal(this, this.options.callback);
this.observer = 1;
};
LazyLoader.prototype.addElements = function (elements) {
this.elements = this.elements || [];
for (var i = 0, length = elements.length; i < length; i++) {
this.elements.push(elements[i]);
}
var observer = this.observer;
if (!observer) {
this.createObserver();
}
};
LazyLoader.prototype.destroyObserver = function (elements) {
};
LazyLoader.prototype.destroy = function (elements) {
this.destroyObserver();
this.options = null;
};
function unveilElements(elements, root, callback) {
if (!elements.length) {
return;
}
var lazyLoader = new LazyLoader({
callback: callback
});
lazyLoader.addElements(elements);
}
LazyLoader.lazyChildren = function (elem, callback) {
unveilElements(elem.getElementsByClassName('lazy'), elem, callback);
};
return LazyLoader;
});