overleaf/services/web/frontend/js/directives/scroll.js
Alasdair Smith e035d526d6 Merge pull request #2287 from overleaf/as-frontend-rearch
Restructure frontend directories

GitOrigin-RevId: 5a1224ca186f4809df45680a80d374c1c318d7bf
2019-11-05 14:22:52 +00:00

56 lines
1.4 KiB
JavaScript

/* eslint-disable
max-len,
no-return-assign,
no-undef,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
* decaffeinate suggestions:
* DS102: Remove unnecessary code created because of implicit returns
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
*/
define(['base'], App =>
App.directive('updateScrollBottomOn', $timeout => ({
restrict: 'A',
link(scope, element, attrs, ctrls) {
// We keep the offset from the bottom fixed whenever the event fires
//
// ^ | ^
// | | | scrollTop
// | | v
// | |-----------
// | | ^
// | | |
// | | | clientHeight (viewable area)
// | | |
// | | |
// | | v
// | |-----------
// | | ^
// | | | scrollBottom
// v | v
// \
// scrollHeight
let scrollBottom = 0
element.on(
'scroll',
e =>
(scrollBottom =
element[0].scrollHeight -
element[0].scrollTop -
element[0].clientHeight)
)
return scope.$on(attrs.updateScrollBottomOn, () =>
$timeout(
() =>
element.scrollTop(
element[0].scrollHeight - element[0].clientHeight - scrollBottom
),
0
)
)
}
})))