d5412cff4e
Also changed "Jump To Post" to go to the post index in the stream rather than the post number
37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
export function scrollTopFor(y) {
|
|
return y - offsetCalculator();
|
|
}
|
|
|
|
export function minimumOffset() {
|
|
const $header = $("header.d-header");
|
|
const headerHeight = $header.outerHeight(true) || 0;
|
|
const headerPositionTop = $header.position().top;
|
|
return headerHeight + headerPositionTop;
|
|
}
|
|
|
|
export default function offsetCalculator() {
|
|
const min = minimumOffset();
|
|
|
|
// on mobile, just use the header
|
|
if ($("html").hasClass("mobile-view")) return min;
|
|
|
|
const $window = $(window);
|
|
const windowHeight = $window.height();
|
|
const documentHeight = $(document).height();
|
|
const topicBottomOffsetTop = $("#topic-bottom").offset().top;
|
|
|
|
// the footer is bigger than the window, we can scroll down past the last post
|
|
if (documentHeight - windowHeight > topicBottomOffsetTop) return min;
|
|
|
|
const scrollTop = $window.scrollTop();
|
|
const visibleBottomHeight = scrollTop + windowHeight - topicBottomOffsetTop;
|
|
|
|
if (visibleBottomHeight > 0) {
|
|
const bottomHeight = documentHeight - topicBottomOffsetTop;
|
|
const offset = (windowHeight - bottomHeight) * visibleBottomHeight / bottomHeight;
|
|
return Math.max(min, offset);
|
|
}
|
|
|
|
return min;
|
|
}
|