Publish Vulpes Preview 15 sources for desktop, Android and Tundra
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
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207
gaia/shared/js/contacts/utilities/image_loader.js
Executable file
207
gaia/shared/js/contacts/utilities/image_loader.js
Executable file
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/* exported ImageLoader */
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'use strict';
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if (!window.ImageLoader) {
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var ImageLoader = function ImageLoader(pContainer, pItems) {
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var container, items, itemsSelector, lastScrollTime, scrollLatency = 100,
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scrollTimer, itemHeight, total, imgsLoading = 0,
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loadImage = defaultLoadImage, self = this;
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init(pContainer, pItems);
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/**
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* Initializer
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*
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*/
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function init(pContainer, pItems) {
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itemsSelector = pItems;
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container = document.querySelector(pContainer);
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attachHandlers();
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window.addEventListener('image-loader-resume', resuming);
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window.addEventListener('image-loader-pause', unload);
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load();
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}
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function resuming() {
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window.clearTimeout(scrollTimer);
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attachHandlers();
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update();
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}
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function onUpdate(evt) {
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evt.stopPropagation();
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onScroll();
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}
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function load() {
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window.clearTimeout(scrollTimer);
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scrollTimer = null;
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items = container.querySelectorAll(itemsSelector);
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// All items have the same height
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itemHeight = items[0] ? items[0].offsetHeight : 1;
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total = items.length;
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// Initial check if items should appear
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window.setTimeout(update, 0);
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}
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function attachHandlers() {
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container.addEventListener('scroll', onScroll);
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document.addEventListener('onupdate', onUpdate);
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}
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function unload() {
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container.removeEventListener('scroll', onScroll);
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document.removeEventListener('onupdate', onUpdate);
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window.clearTimeout(scrollTimer);
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scrollTimer = null;
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}
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function setResolver(pResolver) {
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loadImage = pResolver;
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}
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function onScroll() {
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if (imgsLoading > 0) {
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// Stop the pending images load
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window.stop();
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imgsLoading = 0;
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}
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// Clearing and setting a timer on every scroll event is too slow on
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// some mobile devices. Therefore, set a timer once here and then
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// check how long it has been since the last scroll event in the
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// timer handler to determine what to do.
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lastScrollTime = Date.now();
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if (!scrollTimer) {
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scrollTimer = window.setTimeout(updateFromScroll, scrollLatency);
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}
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}
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function updateFromScroll() {
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scrollTimer = null;
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// If we scrolled more since the timer was set, then we need to
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// delay again. Otherwise, go ahead and update now.
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var deltaLatency = lastScrollTime - Date.now() + scrollLatency;
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if (deltaLatency > 0) {
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scrollTimer = window.setTimeout(updateFromScroll, deltaLatency);
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} else {
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update();
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}
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}
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/**
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* Loads the image contained in a DOM Element.
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*/
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function defaultLoadImage(item) {
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var image = item.querySelector('span[data-type=img][data-src]');
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if (!image) {
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image = item.querySelector('img[data-src]');
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if (!image) {
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// Image by default
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image = item.querySelector('span[data-type=img][data-group]');
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if (image) {
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item.dataset.visited = 'true';
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}
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return;
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}
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}
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++imgsLoading;
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var tmp = new Image();
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var src = tmp.src = image.dataset.src;
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tmp.onload = function onload() {
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--imgsLoading;
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image.style.backgroundImage = 'url(' + src + ')';
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if (tmp.complete) {
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item.dataset.visited = 'true';
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}
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tmp = null;
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};
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tmp.onabort = tmp.onerror = function onerror() {
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--imgsLoading;
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item.dataset.visited = 'false';
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tmp = null;
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};
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}
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/**
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* Calculates the set of items are in the current viewport
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*
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*/
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function update() {
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if (total === 0) {
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return;
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}
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var viewTop = container.scrollTop;
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// Index is always inside or below viewport
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var index = Math.floor(viewTop / itemHeight);
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var containerHeight = container.offsetHeight;
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// Goes backward
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for (var i = index; i >= 0; i--) {
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var item = items[i];
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if (item) {
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if (item.offsetTop + itemHeight < viewTop) {
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break; // Over
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}
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if (item.dataset.visited !== 'true' &&
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item.offsetTop <= viewTop + containerHeight) {
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loadImage(item, self); // Inside
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}
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}
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}
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// Goes forward
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for (var j = index + 1; j < total; j++) {
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var theItem = items[j];
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if (!theItem) {
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// Returning because of index out of bound
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return;
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}
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if (theItem.offsetTop > viewTop + containerHeight) {
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return; // Below
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}
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if (theItem.dataset.visited !== 'true') {
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loadImage(theItem, self);
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}
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}
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} // update
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function releaseImage(item) {
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var image = item.querySelector('span[data-type=img][data-src]');
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if (!image) {
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// Image by default
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image = item.querySelector('span[data-type=img][data-group]');
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if (image) {
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item.dataset.visited = 'false';
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}
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return null;
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}
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image.style.backgroundImage = 'none';
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item.dataset.visited = 'false';
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return image;
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}
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// It's necessary to prevent unit test errors
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function destroy() {
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unload();
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window.removeEventListener('image-loader-pause', unload);
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window.removeEventListener('image-loader-resume', resuming);
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container = items = itemsSelector = lastScrollTime = scrollLatency = null;
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scrollTimer = itemHeight = total = imgsLoading = loadImage = null;
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}
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this.reload = load;
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this.unload = unload;
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this.setResolver = setResolver;
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this.defaultLoad = defaultLoadImage;
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this.releaseImage = releaseImage;
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this.destroy = destroy;
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};
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}
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