[HOLD for payment 2024-09-03][$250] iOS - Attachment - I can to switch to another attachment in PDF zoomed state

[IuliiaHerets]

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Version Number: 9.0.23-0
Reproducible in staging?: Y
Reproducible in production?: Y
If this was caught during regression testing, add the test name, ID and link from TestRail: https://expensify.testrail.io/index.php?/tests/view/4879183&group_by=cases:section_id&group_id=292107&group_order=asc
Issue reported by: Applause Internal Team

Action Performed:

1. Open the app
2. Log in with any account
3. Open any 1:1 chat
4. Send any photo attachment
5. Send any PDF attachment
6. Send any photo attachment
7. Open the PDF
8. Switch to the image on the right after the PDF finished loading
9. Switch back to the PDF
10. Zoom in on the PDF with the pinch method
11. Switch to the image on the right while the PDF is still zoomed

Expected Result:

I shouldn't be able to to switch to another attachment in PDF zoomed state.

Actual Result:

I can to switch to another attachment in PDF zoomed state after swiping to an image and back to the PDF.

Workaround:

Unknown

Platforms:

• Android: Native
• Android: mWeb Chrome
• iOS: Native
• iOS: mWeb Safari
• MacOS: Chrome / Safari
• MacOS: Desktop

Screenshots/Videos

Bug6578108_1724244156588.JCEQ1898.mp4

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Upwork Automation - Do Not Edit

• Upwork Job URL: https://www.upwork.com/jobs/~010723f9a2c0dc6d78
• Upwork Job ID: 1827109849447510261
• Last Price Increase: 2024-08-23

Issue Owner

Current Issue Owner: @s77rt

[melvin-bot]

Triggered auto assignment to @johncschuster (Bug), see https://stackoverflow.com/c/expensify/questions/14418 for more details. Please add this bug to a GH project, as outlined in the SO.

[IuliiaHerets]

We think that this bug might be related to #vip-vsb

[IuliiaHerets]

@johncschuster FYI I haven't added the External label as I wasn't 100% sure about this issue. Please take a look and add the label if you agree it's a bug and can be handled by external contributors

[bernhardoj]

Proposal

Please re-state the problem that we are trying to solve in this issue.

We can swipe between attachment even though the PDF or image is zoomed in.

What is the root cause of that problem?

When the attachment scale is changed, we call the carousel pager onScaleChanged which will disable the scrolling/swiping (isScrollEnabled.value).

App/src/components/Attachments/AttachmentView/AttachmentViewPdf/BaseAttachmentViewPdf.tsx

Lines 43 to 45 in 12037ee

	if (isUsedInCarousel && attachmentCarouselPagerContext) {
	attachmentCarouselPagerContext.onScaleChanged(newScale);
	}

App/src/components/Attachments/AttachmentCarousel/useCarouselContextEvents.ts

Lines 29 to 46 in 12037ee

	const handleScaleChange = useCallback(
	(newScale: number) => {
	if (newScale === scale.current) {
	return;
	}
	scale.current = newScale;
	const newIsScrollEnabled = newScale === 1;
	if (isScrollEnabled.value === newIsScrollEnabled) {
	return;
	}
	// eslint-disable-next-line react-compiler/react-compiler
	isScrollEnabled.value = newIsScrollEnabled;
	onRequestToggleArrows(newIsScrollEnabled);
	},
	[isScrollEnabled, onRequestToggleArrows],

App/src/components/Attachments/AttachmentCarousel/Pager/index.tsx

Lines 105 to 107 in 12037ee

	const animatedProps = useAnimatedProps(() => ({
	scrollEnabled: isScrollEnabled.value,
	}));

But it doesn't work for both PDF and image. For the PDF, we only call the scale change callback if isUsedInCarousel is true, but we never pass the props.

App/src/components/Attachments/AttachmentView/AttachmentViewPdf/BaseAttachmentViewPdf.tsx

Lines 43 to 45 in 12037ee

	if (isUsedInCarousel && attachmentCarouselPagerContext) {
	attachmentCarouselPagerContext.onScaleChanged(newScale);
	}

For both image and PDF, even though the scale change callback is called, the scroll is never disabled because the isScrollEnabled.value here

App/src/components/Attachments/AttachmentCarousel/Pager/index.tsx

Lines 105 to 107 in 12037ee

	const animatedProps = useAnimatedProps(() => ({
	scrollEnabled: isScrollEnabled.value,
	}));

is coming from the local shared value.

App/src/components/Attachments/AttachmentCarousel/Pager/index.tsx

Line 61 in 12037ee

const isScrollEnabled = useSharedValue(true);

But the scale change callback changes the useCarouselContextEvents shared value.

App/src/components/Attachments/AttachmentCarousel/useCarouselContextEvents.ts

Lines 5 to 7 in 12037ee

	function useCarouselContextEvents(setShouldShowArrows: (show?: SetStateAction<boolean>) => void) {
	const scale = useRef(1);
	const isScrollEnabled = useSharedValue(true);

This happens after #43620.

What changes do you think we should make in order to solve the problem?

In pdf attachment component, we can check for pagerRef context, just like we did with image.

App/src/components/Attachments/AttachmentView/AttachmentViewPdf/BaseAttachmentViewPdf.tsx

Lines 42 to 45 in 12037ee

	// When a pdf is shown in a carousel, we want to disable the pager scroll when the pdf is zoomed in
	if (isUsedInCarousel && attachmentCarouselPagerContext) {
	attachmentCarouselPagerContext.onScaleChanged(newScale);
	}

if (!!attachmentCarouselPagerContext?.pagerRef) {

App/src/components/Lightbox/index.tsx

Line 84 in 12037ee

isUsedInCarousel: !!attachmentCarouselPagerContext.pagerRef,

To fix the double isScrollEnabled, we can remove isScrollEnabled from AttachmentCarouselPager/Pager,

App/src/components/Attachments/AttachmentCarousel/Pager/index.tsx

Line 61 in 12037ee

const isScrollEnabled = useSharedValue(true);

then use it from useCarouselContextEvents.

const {handleTap, handleScaleChange, isScrollEnabled} = useCarouselContextEvents(setShouldShowArrows);

useCarouselContextEvents will return the isScrollEnabled.

App/src/components/Attachments/AttachmentCarousel/useCarouselContextEvents.ts

Line 7 in 12037ee

const isScrollEnabled = useSharedValue(true);

App/src/components/Attachments/AttachmentCarousel/useCarouselContextEvents.ts

Line 61 in 12037ee

return {handleTap, handleScaleChange, scale};

return {handleTap, handleScaleChange, scale, isScrollEnabled};

[melvin-bot]

Job added to Upwork: https://www.upwork.com/jobs/~010723f9a2c0dc6d78

[melvin-bot]

Triggered auto assignment to Contributor-plus team member for initial proposal review - @s77rt (External)