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'use strict';
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/* globals define, socket, ajaxify, templates, app */
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define('forum/infinitescroll', ['translator'], function(translator) {
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var scroll = {};
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var callback;
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var previousScrollTop = 0;
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var loadingMore = false;
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var container;
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scroll.init = function(el, cb) {
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if (typeof el === 'function') {
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callback = el;
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container = $(document);
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} else {
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callback = cb;
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container = el || $(document);
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}
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$(window).off('scroll', onScroll).on('scroll', onScroll);
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};
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function onScroll() {
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var currentScrollTop = $(window).scrollTop();
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var wh = $(window).height();
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var viewportHeight = container.height() - wh;
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var offsetTop = container.offset() ? container.offset().top : 0;
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var scrollPercent = 100 * (currentScrollTop - offsetTop) / (viewportHeight <= 0 ? wh : viewportHeight);
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var top = 20, bottom = 80;
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if (scrollPercent < top && currentScrollTop < previousScrollTop) {
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callback(-1);
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} else if (scrollPercent > bottom && currentScrollTop > previousScrollTop) {
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callback(1);
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}
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previousScrollTop = currentScrollTop;
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}
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scroll.loadMore = function(method, data, callback) {
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if (loadingMore) {
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return;
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}
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loadingMore = true;
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socket.emit(method, data, function(err, data) {
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if (err) {
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loadingMore = false;
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return app.alertError(err.message);
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}
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callback(data, function() {
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loadingMore = false;
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});
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});
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};
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scroll.parseAndTranslate = function(template, blockName, data, callback) {
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templates.parse(template, blockName, data, function(html) {
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translator.translate(html, function(translatedHTML) {
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callback($(translatedHTML));
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});
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});
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};
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return scroll;
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});
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