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(function (window) {
// This library re-implements setTimeout, setInterval, clearTimeout, clearInterval for iOS6.
// iOS6 suffers from a bug that kills timers that are created while a page is scrolling.
// This library fixes that problem by recreating timers after scrolling finishes (with interval correction).
// This code is free to use by anyone (MIT, blabla).
// Original Author: rkorving@wizcorp.jp
var timeouts = {};
var intervals = {};
var orgSetTimeout = window.setTimeout;
var orgSetInterval = window.setInterval;
var orgClearTimeout = window.clearTimeout;
var orgClearInterval = window.clearInterval;
// To prevent errors if loaded on older IE.
if (!window.addEventListener) return false;
function createTimer(set, map, args) {
var id, cb = args[0],
repeat = (set === orgSetInterval);
function callback() {
if (cb) {
cb.apply(window, arguments);
if (!repeat) {
delete map[id];
cb = null;
}
}
}
args[0] = callback;
id = set.apply(window, args);
map[id] = {
args: args,
created: Date.now(),
cb: cb,
id: id
};
return id;
}
function resetTimer(set, clear, map, virtualId, correctInterval) {
var timer = map[virtualId];
if (!timer) {
return;
}
var repeat = (set === orgSetInterval);
// cleanup
clear(timer.id);
// reduce the interval (arg 1 in the args array)
if (!repeat) {
var interval = timer.args[1];
var reduction = Date.now() - timer.created;
if (reduction < 0) {
reduction = 0;
}
interval -= reduction;
if (interval < 0) {
interval = 0;
}
timer.args[1] = interval;
}
// recreate
function callback() {
if (timer.cb) {
timer.cb.apply(window, arguments);
if (!repeat) {
delete map[virtualId];
timer.cb = null;
}
}
}
timer.args[0] = callback;
timer.created = Date.now();
timer.id = set.apply(window, timer.args);
}
window.setTimeout = function () {
return createTimer(orgSetTimeout, timeouts, arguments);
};
window.setInterval = function () {
return createTimer(orgSetInterval, intervals, arguments);
};
window.clearTimeout = function (id) {
var timer = timeouts[id];
if (timer) {
delete timeouts[id];
orgClearTimeout(timer.id);
}
};
window.clearInterval = function (id) {
var timer = intervals[id];
if (timer) {
delete intervals[id];
orgClearInterval(timer.id);
}
};
//check and add listener on the top window if loaded on frameset/iframe
var win = window;
while (win.location != win.parent.location) {
win = win.parent;
}
win.addEventListener('scroll', function () {
// recreate the timers using adjusted intervals
// we cannot know how long the scroll-freeze lasted, so we cannot take that into account
var virtualId;
for (virtualId in timeouts) {
resetTimer(orgSetTimeout, orgClearTimeout, timeouts, virtualId);
}
for (virtualId in intervals) {
resetTimer(orgSetInterval, orgClearInterval, intervals, virtualId);
}
});
}(window));