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feat(StickyPlaceholder): update placeholder dimensions on children up…
…dates Fix #28
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| import * as React from 'react'; | ||
| import { IRect } from 'react-viewport-utils'; | ||
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| interface IElementResizeObserverProps { | ||
| stickyRef: React.RefObject<any>; | ||
| onUpdate: (rect: IRect) => void; | ||
| } | ||
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| class ElementResizeObserver extends React.PureComponent< | ||
| IElementResizeObserverProps | ||
| > { | ||
| private resizeObserver: ResizeObserver | null; | ||
| constructor(props: IElementResizeObserverProps) { | ||
| super(props); | ||
| this.resizeObserver = null; | ||
| } | ||
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| componentDidMount() { | ||
| this.resetObserver(); | ||
| this.installObserver(); | ||
| } | ||
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| componentDidUpdate() { | ||
| this.resetObserver(); | ||
| this.installObserver(); | ||
| } | ||
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| componentWillUnmount() { | ||
| this.resetObserver(); | ||
| } | ||
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| installObserver() { | ||
| if (!this.props.stickyRef.current) { | ||
| return; | ||
| } | ||
| if (typeof window.ResizeObserver !== 'undefined') { | ||
| this.resizeObserver = new window.ResizeObserver(entries => { | ||
| if (entries && entries[0] && entries[0].contentRect) { | ||
| this.props.onUpdate(entries[0].contentRect); | ||
| } | ||
| }); | ||
| this.resizeObserver!.observe(this.props.stickyRef.current); | ||
| } | ||
| } | ||
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|
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| resetObserver() { | ||
| if (this.resizeObserver) { | ||
| this.resizeObserver.disconnect(); | ||
| this.resizeObserver = null; | ||
| } | ||
| } | ||
|
|
||
| render(): null { | ||
| return null; | ||
| } | ||
| } | ||
|
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| export default ElementResizeObserver; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // @see https://gist.github.com/strothj/708afcf4f01dd04de8f49c92e88093c3 | ||
| interface Window { | ||
| ResizeObserver: ResizeObserver; | ||
| } | ||
|
|
||
| /** | ||
| * The ResizeObserver interface is used to observe changes to Element's content | ||
| * rect. | ||
| * | ||
| * It is modeled after MutationObserver and IntersectionObserver. | ||
| */ | ||
| interface ResizeObserver { | ||
| new (callback: ResizeObserverCallback): ResizeObserver; | ||
|
|
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| /** | ||
| * Adds target to the list of observed elements. | ||
| */ | ||
| observe: (target: Element) => void; | ||
|
|
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| /** | ||
| * Removes target from the list of observed elements. | ||
| */ | ||
| unobserve: (target: Element) => void; | ||
|
|
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| /** | ||
| * Clears both the observationTargets and activeTargets lists. | ||
| */ | ||
| disconnect: () => void; | ||
| } | ||
|
|
||
| /** | ||
| * This callback delivers ResizeObserver's notifications. It is invoked by a | ||
| * broadcast active observations algorithm. | ||
| */ | ||
| interface ResizeObserverCallback { | ||
| (entries: ResizeObserverEntry[], observer: ResizeObserver): void; | ||
| } | ||
|
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| interface ResizeObserverEntry { | ||
| /** | ||
| * @param target The Element whose size has changed. | ||
| */ | ||
| new (target: Element): ResizeObserverEntry; | ||
|
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| /** | ||
| * The Element whose size has changed. | ||
| */ | ||
| readonly target: Element; | ||
|
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| /** | ||
| * Element's content rect when ResizeObserverCallback is invoked. | ||
| */ | ||
| readonly contentRect: DOMRectReadOnly; | ||
| } | ||
|
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| interface DOMRectReadOnly { | ||
| readonly x: number; | ||
| readonly y: number; | ||
| readonly width: number; | ||
| readonly height: number; | ||
| readonly top: number; | ||
| readonly right: number; | ||
| readonly bottom: number; | ||
| readonly left: number; | ||
|
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| toJSON: () => any; | ||
| } |