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40f86829f7
* We now use a new custom view, {{cloaked-collection}} to display posts in a topic.
* Posts are removed and inserted (cloaked/uncloaked) into the DOM dynamically based on whether they
are visible in the current browser viewport.
* There's been a lot of refactoring to ensure the relationship between the post views and the topic
controller is sane.
* Lots of fixes involving jumping to a post, including a new LockOn component to that tries to stay
focused on an element even if stuff is loading before it in the DOM that would normally push it
down.
55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
(function (exports) {
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var scrollEvents = "scroll.lock-on touchmove.lock-on mousedown.lock-on wheel.lock-on DOMMouseScroll.lock-on mousewheel.lock-on keyup.lock-on";
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var LockOn = function(selector, options) {
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this.selector = selector;
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this.options = options || {};
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};
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LockOn.prototype.elementTop = function() {
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var offsetCalculator = this.options.offsetCalculator;
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return $(this.selector).offset().top - (offsetCalculator ? offsetCalculator() : 0);
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};
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LockOn.prototype.lock = function() {
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var self = this,
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previousTop = this.elementTop(),
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startedAt = new Date().getTime()
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i = 0;
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$(window).scrollTop(previousTop);
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var interval = setInterval(function() {
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i = i + 1;
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var top = self.elementTop(),
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scrollTop = $(window).scrollTop();
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if ((top !== previousTop) || (scrollTop !== top)) {
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$(window).scrollTop(top);
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previousTop = top;
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}
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// We commit suicide after 1s just to clean up
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var nowTime = new Date().getTime();
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if (nowTime - startedAt > 1000) {
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$('body,html').off(scrollEvents)
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clearInterval(interval);
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}
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}, 50);
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$('body,html').off(scrollEvents).on(scrollEvents, function(e){
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if ( e.which > 0 || e.type === "mousedown" || e.type === "mousewheel" || e.type === "touchmove") {
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$('body,html').off(scrollEvents);
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clearInterval(interval);
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}
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})
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};
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exports.LockOn = LockOn;
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})(window);
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