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Cards and CommentThreadItems scroll into view when needed
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /** | ||
| * @providesModule ScrollView | ||
| * @flow | ||
| */ | ||
|
|
||
| import * as React from 'react' | ||
| import styled from 'styled-components' | ||
|
|
||
| class ScrollView extends React.Component<{ | ||
| maxHeightOffset: string, | ||
| innerRef: HTMLDivElement => any, | ||
| children: React.Node, | ||
| }> { | ||
| static defaultProps = { innerRef: (_: HTMLDivElement) => {} } | ||
|
|
||
| container: ?HTMLDivElement | ||
|
|
||
| componentDidMount () { | ||
| this.container && | ||
| this.container.addEventListener('wheel', this.handleScroll, false) | ||
| this.container && this.props.innerRef(this.container) | ||
| } | ||
|
|
||
| componentWillUnmount () { | ||
| this.container && | ||
| this.container.removeEventListener('wheel', this.handleScroll, false) | ||
| } | ||
|
|
||
| render () { | ||
| const { children, ...rest } = this.props | ||
| return ( | ||
| <ScrollViewDiv {...rest} innerRef={el => (this.container = el)}> | ||
| {children} | ||
| </ScrollViewDiv> | ||
| ) | ||
| } | ||
|
|
||
| handleScroll = (e: WheelEvent) => { | ||
| const target = ((e.target: any): HTMLElement) | ||
| if (this.container && this.container.contains(target)) { | ||
| var scrollTop = this.container.scrollTop | ||
| var scrollHeight = this.container.scrollHeight | ||
| var height = this.container.clientHeight | ||
| var wheelDelta = e.deltaY | ||
| var isDeltaPositive = wheelDelta > 0 | ||
|
|
||
| if (isDeltaPositive && wheelDelta > scrollHeight - height - scrollTop) { | ||
| this.container.scrollTop = scrollHeight | ||
| return cancelScrollEvent(e) | ||
| } else if (!isDeltaPositive && -wheelDelta > scrollTop) { | ||
| this.container.scrollTop = 0 | ||
| return cancelScrollEvent(e) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| export default ScrollView | ||
|
|
||
| function cancelScrollEvent (e: WheelEvent) { | ||
| e.stopImmediatePropagation() | ||
| e.preventDefault() | ||
| return false | ||
| } | ||
|
|
||
| const ScrollViewDiv = styled.div.attrs({ className: 'ScrollView' })` | ||
| max-height: ${({ maxHeightOffset }) => | ||
| `calc(100vh - (${maxHeightOffset}))` || '100vh'}; | ||
| overflow-x: hidden; | ||
| overflow-y: scroll; | ||
| -webkit-overflow-scrolling: touch; | ||
| ` | ||
|
|
||
| export class ScrollIntoView extends React.Component<{}> { | ||
| ref: ?HTMLDivElement | ||
|
|
||
| componentDidMount () { | ||
| setTimeout(() => { | ||
| const rect = this.ref && this.ref.getBoundingClientRect() | ||
| const windowHeight = | ||
| document.documentElement && document.documentElement.clientHeight | ||
|
|
||
| if ( | ||
| rect && | ||
| windowHeight && | ||
| (rect.top < 0 || rect.bottom > windowHeight) | ||
| ) { | ||
| this.ref && | ||
| this.ref.scrollIntoView && | ||
| this.ref.scrollIntoView({ behavior: 'smooth', block: 'start' }) | ||
| } | ||
| }, 50) | ||
| } | ||
|
|
||
| render () { | ||
| return <ScrollTarget innerRef={ref => (this.ref = ref)} /> | ||
| } | ||
| } | ||
| const ScrollTarget = styled.div` | ||
| transform: translateY(-50px); | ||
| ` | ||
|
|
||
| export class ScrollLock extends React.Component<{ children: React.Node }> { | ||
| componentDidMount () { | ||
| document.body && document.body.classList.add('pt-overlay-open') | ||
| } | ||
|
|
||
| componentWillUnmount () { | ||
| document.body && document.body.classList.remove('pt-overlay-open') | ||
| } | ||
|
|
||
| render () { | ||
| return this.props.children | ||
| } | ||
| } |