Expose TextLayoutResult APIs for accurately reading line metrics [237428541]

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Feature Request

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Description

sa...@squareup.com

created issue #1

Jun 28, 2022 08:24PM

It is currently difficult to draw custom spans for Text() because TextLayoutResult does not expose any APIs for accurately reading line bounds. Considering that AndroidParagraph already has APIs such as getLineAscent(), getLineBaseline() and getLineDescent(), can they be bubbled up to TextLayoutResult?

Having access to getTopPadding() and getBottomPadding() from android.text.Layout would also be helpful.

AFAIK, there is currently no workaround for reading these values. Inspecting font metrics would have been one option, but that is not available either (https://issuetracker.google.com/issues/173648606).

- Jetpack Compose version: 1.2.0-rc02
- Jetpack Compose component used: Text

Comments

ha...@google.com <ha...@google.com> Oct 6, 2022 08:48AM

Reassigned to ha...@google.com.

ja...@squareup.com <ja...@squareup.com> #2Apr 27, 2023 05:54PM

May I ask why P3? This is blocking for me to go to prod, I'd really like some inputs about what is going on so I can either fix or build a repro to have this fixed.

ha...@google.com <ha...@google.com> #3Apr 28, 2023 12:14PM

Unfortunately I am unable to reproduce it as well. Maybe there is a chance you can share your code with me? You can send it to my email as you did previously already.
For the ideas on what to take a look, how do you use LazyListState.layoutInfo in your app? Will it continue growing if you comment out such usages?

Message last modified on Apr 28, 2023 01:36PM

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ap...@google.com <ap...@google.com> #4Feb 14, 2024 01:51PM

It happens even on screens that does not use the layoutInfo it just require many up / down flings.

LazyColumn(state = rememberLazyListState())

The only thing all screen have in common in that they have multiple item {} item{} block :(

Just in case the app is in open beta at https://play.google.com/store/apps/details?id=app.symfonik.music.player but don't think you can see much except repro.

My main question before trying to do complex repro, is how much will it be relevant with all the recent changes in alpha 8 about Lazy stuff? And side question when https://issuetracker.google.com/issues/229752147 is fixed (it touches all my screens maybe another indicator?) will there be some snapshot build with the fix so I can directly try to repro on that?

ha...@google.com <ha...@google.com> May 29, 2024 12:03AM

Reassigned to an...@google.com.

Issue 237428541