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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| import type {UnsubscribeFunction, UnsubscribeObject} from '@amadeus-it-group/tansu'; | ||
| import {asReadable, writable} from '@amadeus-it-group/tansu'; | ||
|
|
||
| /** | ||
| * Creates an iframe handler, allowing to enable dynamic resizing and detect if the parent should display a spinner. | ||
| * The returned spinner store includes a debounce for better user experience. | ||
| * | ||
| * In order to detect when the page is fully loaded, we listen to message events. | ||
| * | ||
| * @param defaultHeight the default height in pixels of the iframe | ||
| * @param resize enable dynamic resizing | ||
| * @param messageType the type of the message event we listen to | ||
| * @param spinnerDebounce the debounce in milliseconds before the spinner store is set to true | ||
| * @returns the handler and a spinner store | ||
| */ | ||
| export function createIframeHandler(defaultHeight: number, resize = true, messageType = 'sampleload', spinnerDebounce = 300) { | ||
| const _iframeLoaded$ = writable(true); | ||
| const _showSpinner$ = writable(false); | ||
| const _height$ = writable(0); | ||
|
|
||
| let spinnerTimer: any; | ||
| let resizeObserver: ResizeObserver | undefined; | ||
| let heightSubscription: (UnsubscribeFunction & UnsubscribeObject) | undefined; | ||
|
|
||
| const setupObserver = (iframe: HTMLIFrameElement) => { | ||
| if (!resizeObserver) { | ||
| resizeObserver = new ResizeObserver((entries) => { | ||
| if (entries.length === 1) { | ||
| if (_iframeLoaded$()) { | ||
| _height$.set(Math.ceil(entries[0].contentRect.height || _height$())); | ||
| } | ||
| } | ||
| }); | ||
| } | ||
| resizeObserver.disconnect(); | ||
| const root = iframe.contentDocument?.getElementById('root'); | ||
| if (root) { | ||
| resizeObserver.observe(root); | ||
| } | ||
| }; | ||
| const onLoad = (event: Event) => { | ||
| if (event.target instanceof HTMLIFrameElement) { | ||
| setupObserver(event.target); | ||
| } | ||
| }; | ||
|
|
||
| return { | ||
| showSpinner$: asReadable(_showSpinner$), | ||
| handler: (iframe: HTMLIFrameElement, baseSrc: string) => { | ||
| iframe.onload = onLoad; | ||
| if (iframe.contentDocument?.getElementById('root')) { | ||
| setupObserver(iframe); | ||
| } | ||
| if (resize) { | ||
| heightSubscription = _height$.subscribe((height) => (iframe.height = (height || defaultHeight) + 'px')); | ||
| } else { | ||
| iframe.height = defaultHeight + 'px'; | ||
| } | ||
|
|
||
| const update = (baseSrc: string) => { | ||
| if (!iframe.contentWindow?.location?.href?.startsWith(baseSrc)) { | ||
| _iframeLoaded$.set(false); | ||
| if (spinnerTimer) { | ||
| clearTimeout(spinnerTimer); | ||
| } | ||
| spinnerTimer = setTimeout(() => { | ||
| _showSpinner$.set(true); | ||
| spinnerTimer = undefined; | ||
| }, spinnerDebounce); | ||
| } | ||
| }; | ||
| update(baseSrc); | ||
|
|
||
| const sampleLoad = (e: Event) => { | ||
| if (e instanceof MessageEvent && e.data.type === messageType && e.source === iframe.contentWindow) { | ||
| if (spinnerTimer) { | ||
| clearTimeout(spinnerTimer); | ||
| spinnerTimer = undefined; | ||
| } | ||
| _iframeLoaded$.set(true); | ||
| _showSpinner$.set(false); | ||
| } | ||
| }; | ||
| window.addEventListener('message', sampleLoad, false); | ||
|
|
||
| return { | ||
| update, | ||
| destroy: () => { | ||
| window.removeEventListener('message', sampleLoad); | ||
| resizeObserver?.disconnect(); | ||
| heightSubscription?.unsubscribe(); | ||
| }, | ||
| }; | ||
| }, | ||
| }; | ||
| } |
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