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fix: check canUseTouchScreen on each render #24356

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hannojg
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@hannojg hannojg commented Aug 10, 2023

Details

When implementing:

a change in behaviour got introduced where in the AttachmentCarousel before the DeviceCapabilities.canUseTouchScreen was checked every render, but after the PR it was only checked once on app start.
This reverts back to the old behaviour where its checked every render.

Fixed Issues

$ https://expensify.slack.com/archives/C049HHMV9SM/p1691474174723719
PROPOSAL:

Tests

  • Send attachment to a chat, open the attachment. Verify that no errors appear in the JS console

Offline tests

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  • Send attachment to a chat, open the attachment. Verify that no errors appear in the JS console

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Screenshot 2023-08-10 at 10 06 06

Mobile Web - Chrome
Mobile Web - Safari
Desktop
iOS

Simulator Screenshot - iPhone 14 Pro - 2023-08-11 at 17 31 10

Android

@hannojg hannojg requested a review from a team as a code owner August 10, 2023 08:06
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hannojg commented Aug 10, 2023

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@melvin-bot melvin-bot bot removed the request for review from a team August 10, 2023 08:07
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melvin-bot bot commented Aug 10, 2023

@MariaHCD Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

@melvin-bot melvin-bot bot requested a review from MariaHCD August 10, 2023 08:07
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This change makes sense to me. cc: @bernhardoj @kidroca since you both were discussing this in Slack here

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MariaHCD commented Aug 10, 2023

@hannojg is testing only on web enough for this PR?

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MariaHCD commented Aug 10, 2023

Reviewer Checklist

  • I have verified the author checklist is complete (all boxes are checked off).
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    • I verified the steps for local testing are in the Tests section
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    • I verified the steps cover any possible failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
    • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
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    • The file is named correctly
    • The component has a clear name that is non-ambiguous and the purpose of the component can be inferred from the name alone
    • The only data being stored in the state is data necessary for rendering and nothing else
    • For Class Components, any internal methods passed to components event handlers are bound to this properly so there are no scoping issues (i.e. for onClick={this.submit} the method this.submit should be bound to this in the constructor)
    • Any internal methods bound to this are necessary to be bound (i.e. avoid this.submit = this.submit.bind(this); if this.submit is never passed to a component event handler like onClick)
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    • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
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    • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(themeColors.componentBG)
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Screenshots/Videos

Web
Screen.Recording.2023-08-10.at.1.31.55.PM.mov
Screen.Recording.2023-08-10.at.1.28.24.PM.mov
Mobile Web - Chrome
Screen.Recording.2023-08-10.at.4.55.47.PM.mov
Mobile Web - Safari
Desktop
Screen.Recording.2023-08-10.at.5.00.00.PM.mov
iOS
Android
Screen.Recording.2023-08-10.at.4.53.52.PM.mov

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hannojg commented Aug 10, 2023

@MariaHCD testing on at least one touch screen based device as well would be good(android or iOS)

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@MariaHCD

This change makes sense to me. cc: @bernhardoj @kidroca since you both were discussing this in Slack here

LGTM!

@@ -27,6 +26,7 @@ function AttachmentCarousel({report, reportActions, source, onNavigate}) {
const scrollRef = useRef(null);

const {windowWidth, isSmallScreenWidth} = useWindowDimensions();
const canUseTouchScreen = DeviceCapabilities.canUseTouchScreen();
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One minor concern is that we currently can't trigger a re-render when the value from DeviceCapabilities.canUseTouchScreen() changes. This means we're dependent on external factors to trigger a re-render of AttachmentCarousel before it acknowledges any change in the canUseTouchScreen() value.

However, given the context of this specific use-case, this behavior seems acceptable.

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@hannojg Okay, I'll test on native Android and mWeb Android. Could you test on iOS and add to your checklist?

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Actually, we still have one case where the canUseTouchScreen is only assigned once in useCarouselArrows

const canUseTouchScreen = DeviceCapabilities.canUseTouchScreen();
function useCarouselArrows() {

However, looking at the commit message, this is done to fix arrows not showing on the web 🤔, but from my testing the arrow is showing fine on the web/mWeb.

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hannojg commented Aug 11, 2023

@MariaHCD tested on iOS and added iOS screenshot to the checklist 👍

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hannojg commented Aug 11, 2023

@bernhardoj You mean when you revert the changes from the commit (so that canUseTouchScreen is inside the FC) you can still see the arrows?

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@hannojg yep.

I found that the one that makes the arrow doesn't show is this specific change

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Julesssss previously approved these changes Aug 15, 2023
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Thanks for fixing!

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mountiny commented Aug 15, 2023

There is no QA steps listed, should this be noQA or are they missing?

I see them its just oddly formatted.

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Triggered a build so we can test on the device more easily

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This looks good to me and tests well!

@hannojg, is there any follow up regarding the arrow keys that @bernhardoj brought up here?

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hannojg commented Aug 21, 2023

Not sure, I want @chrispader to double check since its his original PR!

@chrispader chrispader dismissed stale reviews from MariaHCD and Julesssss via 15c8704 August 28, 2023 07:53
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I added a useCanUseTouchScreen hook, which will check for updates of the canUseTouchScreen value on every render and update the boolean accordingly. This way, we're not dependent on external factors to trigger the update.

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That makes sense to me! We've just got some lint errors now.

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That makes sense to me! We've just got some lint errors now.

Sorry, done 👍

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I have a question. If we are updating canUseTouchScreen inside useEffect, won't that mean we still depend on external factors to trigger the useEffect?

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kidroca commented Aug 28, 2023

@bernhardoj

I have a question. If we are updating canUseTouchScreen inside useEffect, won't that mean we still depend on external factors to trigger the useEffect?

Yes, as it currently stands, it seems we've opted for a polling approach. We're checking DeviceCapabilities.canUseTouchScreen during each render of the component that utilizes this hook, as explained by @chrispader.

I added a useCanUseTouchScreen hook, which will check for updates of the canUseTouchScreen value on every render and update the boolean accordingly. This way, we're not dependent on external factors to trigger the update.


No offense, but I'm curious about why we chose to create a useCanUseTouchScreen hook for several reasons:

  • It needs to poll, running an effect on each render to function correctly.
  • The likelihood of this device capability changing dynamically seems low, so is there a need for constant monitoring? In my opinion, fetching the current value directly from DeviceCapabilities.canUseTouchScreen at the time of component render should suffice.
  • The name useCanUse... feels a bit awkward to me. :)

Comment on lines 9 to 18
const [canUseTouchScreen, setCanUseTouchScreen] = useState(DeviceCapabilities.canUseTouchScreen());

// eslint-disable-next-line react-hooks/exhaustive-deps
useEffect(() => {
const newCanUseTouchScreen = DeviceCapabilities.canUseTouchScreen();
if (canUseTouchScreen === newCanUseTouchScreen) return;
setCanUseTouchScreen();
});

return canUseTouchScreen;
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You can achieve the same outcome with a more straightforward approach:

Suggested change
const [canUseTouchScreen, setCanUseTouchScreen] = useState(DeviceCapabilities.canUseTouchScreen());
// eslint-disable-next-line react-hooks/exhaustive-deps
useEffect(() => {
const newCanUseTouchScreen = DeviceCapabilities.canUseTouchScreen();
if (canUseTouchScreen === newCanUseTouchScreen) return;
setCanUseTouchScreen();
});
return canUseTouchScreen;
return DeviceCapabilities.canUseTouchScreen();

Here's why this alternative is equivalent:

  1. The current implementation uses a useEffect that runs logic on each render (since there's no dependencies array).
  2. In such a scenario, you could simply execute the logic in the hook body, eliminating the need for a useEffect and state

chrispader and others added 2 commits August 28, 2023 20:08
Co-authored-by: Bernhard Owen Josephus <50919443+bernhardoj@users.noreply.github.com>
Co-authored-by: Maria D'Costa <mariahcdcosta@gmail.com>
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@bernhardoj

I have a question. If we are updating canUseTouchScreen inside useEffect, won't that mean we still depend on external factors to trigger the useEffect?

Yes, as it currently stands, it seems we've opted for a polling approach. We're checking DeviceCapabilities.canUseTouchScreen during each render of the component that utilizes this hook, as explained by @chrispader.

I added a useCanUseTouchScreen hook, which will check for updates of the canUseTouchScreen value on every render and update the boolean accordingly. This way, we're not dependent on external factors to trigger the update.

No offense, but I'm curious about why we chose to create a useCanUseTouchScreen hook for several reasons:

  • It needs to poll, running an effect on each render to function correctly.
  • The likelihood of this device capability changing dynamically seems low, so is there a need for constant monitoring? In my opinion, fetching the current value directly from DeviceCapabilities.canUseTouchScreen at the time of component render should suffice.
  • The name useCanUse... feels a bit awkward to me. :)

Yes, you're right. This was a silly mistake on my side...

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@kidroca @MariaHCD could we get another review on this so we can merge it. @hannojg is on holiday right now, so he cannot trigger it right now 😄

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Just holding on a final @kidroca approval

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LGTM!

@MariaHCD MariaHCD merged commit 3e2723c into Expensify:main Sep 14, 2023
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✋ This PR was not deployed to staging yet because QA is ongoing. It will be automatically deployed to staging after the next production release.

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🚀 Deployed to staging by https://github.com/MariaHCD in version: 1.3.70-0 🚀

platform result
🤖 android 🤖 success ✅
🖥 desktop 🖥 success ✅
🍎 iOS 🍎 success ✅
🕸 web 🕸 success ✅

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🚀 Deployed to production by https://github.com/thienlnam in version: 1.3.70-8 🚀

platform result
🤖 android 🤖 failure ❌
🖥 desktop 🖥 success ✅
🍎 iOS 🍎 failure ❌
🕸 web 🕸 success ✅

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