image throttler
initial commit
This commit is contained in:
Markerov
czaks
parent
63491b0b9a
commit
c3146e1794
@ -13,26 +13,100 @@
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*/
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onready(function(){
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'use strict';
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var DEFAULT_MAX = 5; // default maximum image loads
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var inline_expand_post = function() {
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var link = this.getElementsByTagName('a');
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var loadingQueue = (function () {
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var MAX_IMAGES = localStorage.inline_expand_max || DEFAULT_MAX; // maximum number of images to load concurrently, 0 to disable
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var loading = 0; // number of images that is currently loading
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var waiting = []; // waiting queue
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var enqueue = function (ele) {
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waiting.push(ele);
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};
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var dequeue = function () {
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return waiting.shift();
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};
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var update = function() {
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var ele;
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while (loading < MAX_IMAGES || MAX_IMAGES === 0) {
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ele = dequeue();
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if (ele) {
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++loading;
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ele.deferred.resolve();
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} else {
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return;
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}
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}
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};
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return {
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remove: function (ele) {
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var i = waiting.indexOf(ele);
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if (i > -1) {
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waiting.splice(i, 1);
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}
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if (ele.dataset.imageLoading === 'true') {
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ele.dataset.imageLoading = 'false';
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clearTimeout(ele.timeout);
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--loading;
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}
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},
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add: function (ele) {
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ele.deferred = $.Deferred();
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ele.deferred.done(function () {
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var $loadstart = $.Deferred();
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var thumb = ele.childNodes[0];
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var img = ele.childNodes[1];
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var onLoadStart = function (img) {
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if (img.naturalWidth) {
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$loadstart.resolve(img, thumb);
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} else {
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return (ele.timeout = setTimeout(onLoadStart, 30, img));
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}
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};
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$(img).one('load', function () {
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$.when($loadstart).done(function () {
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// once fully loaded, update the waiting queue
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--loading;
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ele.dataset.imageLoading = 'false';
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update();
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});
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});
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$loadstart.done(function (img, thumb) {
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thumb.style.display = 'none';
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img.style.display = '';
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});
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img.setAttribute('src', ele.href);
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ele.dataset.imageLoading = 'true';
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ele.timeout = onLoadStart(img);
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});
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if (loading < MAX_IMAGES || MAX_IMAGES === 0) {
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++loading;
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ele.deferred.resolve();
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} else {
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enqueue(ele);
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}
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}
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};
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})();
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for (var i = 0; i < link.length; i++) {
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if (typeof link[i] == "object" && link[i].childNodes && typeof link[i].childNodes[0] !== 'undefined' && link[i].childNodes[0].src && link[i].childNodes[0].className.match(/post-image/) && !link[i].className.match(/file/)) {
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if (typeof link[i] == "object" && link[i].childNodes && typeof link[i].childNodes[0] !== 'undefined' &&
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link[i].childNodes[0].src && link[i].childNodes[0].className.match(/post-image/) && !link[i].className.match(/file/)) {
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link[i].onclick = function(e) {
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var img, post_body, still_open, canvas;
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var img, post_body, still_open, canvas, scroll;
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var thumb = this.childNodes[0];
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var padding = 5;
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var boardlist = $('.boardlist')[0];
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var loadImage = function(img, thumb) {
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if (img.naturalWidth) {
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thumb.style.display = 'none';
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img.style.display = '';
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}
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else {
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return thumb.parentNode.timeout = setTimeout(loadImage, 30, img, thumb);
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}
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};
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if (thumb.className == 'hidden')
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return false;
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@ -54,31 +128,19 @@ onready(function(){
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img = document.createElement('img');
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img.className = 'full-image';
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img.setAttribute('src', this.href);
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img.setAttribute('alt', 'Fullsized image');
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img.style.display = 'none';
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img.setAttribute('alt', 'Fullsized image');
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this.appendChild(img);
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this.timeout = loadImage(img, thumb);
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loadingQueue.add(this);
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} else {
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clearTimeout(this.timeout);
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loadingQueue.remove(this);
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scroll = false;
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// scroll to thumb if not triggered by 'shrink all image'
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if (e.target.className == 'full-image') {
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post_body = $(e.target).parentsUntil('form > div').last();
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still_open = post_body.find('.post-image').filter(function(){return $(this).parent().attr('data-expanded') == 'true'}).length;
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//deal with differnt boards' menu styles
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if ($(boardlist).css('position') == 'fixed')
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padding += boardlist.getBoundingClientRect().height;
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if (still_open > 1) {
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if (e.target.getBoundingClientRect().top - padding < 0)
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$(document).scrollTop($(e.target).parent().parent().offset().top - padding);
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} else {
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if (post_body[0].getBoundingClientRect().top - padding < 0)
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$(document).scrollTop(post_body.offset().top - padding);
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}
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scroll = true;
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}
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if (~this.parentNode.className.indexOf('multifile'))
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@ -86,10 +148,32 @@ onready(function(){
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thumb.style.opacity = '';
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thumb.style.display = '';
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this.removeChild(thumb.nextSibling);
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if (thumb.nextSibling) this.removeChild(thumb.nextSibling); //full image loaded or loading
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delete this.dataset.expanded;
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delete thumb.style.filter;
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// do the scrolling after page reflow
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if (scroll) {
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post_body = $(thumb).parentsUntil('form > div').last();
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// on multifile posts, determin how many other images are still expanded
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still_open = post_body.find('.post-image').filter(function(){
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return $(this).parent().attr('data-expanded') == 'true';
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}).length;
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// deal with differnt boards' menu styles
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if ($(boardlist).css('position') == 'fixed')
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padding += boardlist.getBoundingClientRect().height;
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if (still_open > 0) {
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if (thumb.getBoundingClientRect().top - padding < 0)
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$(document).scrollTop($(thumb).parent().parent().offset().top - padding);
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} else {
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if (post_body[0].getBoundingClientRect().top - padding < 0)
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$(document).scrollTop(post_body.offset().top - padding);
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}
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}
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if (localStorage.no_animated_gif === 'true' && typeof unanimate_gif === 'function') {
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unanimate_gif(thumb);
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}
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@ -100,6 +184,22 @@ onready(function(){
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}
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};
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// setting up user option
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if (window.Options && Options.get_tab('general')) {
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Options.extend_tab('general', '<span id="inline-expand-max">'+ _('Number of simultaneous image downloads (0 to disable): ') +
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'<input type="number" step="1" min="0" size="4"></span>');
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$('#inline-expand-max input')
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.css('width', '50px')
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.val(localStorage.inline_expand_max || DEFAULT_MAX)
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.on('change', function (e) {
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// validation in case some fucktard tries to enter a negative floating point number
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var n = parseInt(e.target.value);
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var val = (n<0) ? 0 : n;
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localStorage.inline_expand_max = val;
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});
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}
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if (window.jQuery) {
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$('div[id^="thread_"]').each(inline_expand_post);
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