UI / vertical scrolling is broken in `scroll` example

Aperta
  • Qualcosa non va?
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I maintainer di solito rispondono entro 2 giorni

Nessuno ha ancora preso questa issue.

Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
52/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
rust
Ambito
frontend, game-dev

Direzione di ricerca

Start by running the scroll example and compare its layout before and after the Taffy update referenced in the issue. The report points to UI node dimensions and alignment behavior, but does not identify a file or test; trace the example and the Taffy alignment changes to locate the regression. Done means the lists remain in frame and vertical scrolling behaves correctly with the reported item counts.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

A-UI C-Bug C-Examples I-Regression S-Ready-For-Implementation X-Uncontroversial

Bevy version and features

What you did

Run the scroll example to test vertical scrolling

What went wrong

There are "two" main issues that show up in this example:

  1. The UI layout is not correct: Some lists like the bidirectional scrolling lists and the nested scrolling list are not visible, rendering out of frame (See additional information below).
  2. Vertical scrolling is not working correctly: Because of how messed up the UI is, it makes vertical scrolling seem like it is bugged or not working at all, if I increase the amount of items (changing the "spawn range" from 0..25 to 0..100) then it works fine, maybe the container is showing the 25 items it has, but this is hard to tell as half of the list is out of frame and previously the container only showed 15 items at once.

Additional information

I am not sure if scroll is only the example that has this problem, but it SEEMS the issue has something to do with the dimensions of the nodes because of how the vertical scrolling list seems to have enough height (with height: percent(50)) to show all the its items, and how the other lists are rendering out of frame despite the only thing dictating their spacing is justify_content: JustifyContent::SpaceBetween in the parent container with a width and height of percent(100).

The commit updating Taffy is small and doesn't touch the scroll example or any UI logic except updating Taffy's alignment style types that changed from being enums to structs in v0.11.0.

Before e3d48d6:
Image

After e3d48d6:
Image

EDIT: Wording

Lingua principale
Rust
Stelle
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Fork
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Merge medio
3g 19h
PR unite (30g)
134

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