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avm2: Add style sheet support for TextField #19143

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@kjarosh kjarosh commented Jan 6, 2025

This patch adds TextField.styleSheet support. Now when parsing HTML, the attached style sheet is used to provide styles for HTML elements.

This patch also adds support for:

  • class attributes in HTML,
  • <span> HTML elements,
  • custom HTML elements.

CSS support is spanned across all existing HTML elements and custom ones.

Additionally, some observable behaviors related to .styleSheet are implemented, e.g. performing relayout after setting .styleSheet, or .text behaving as .htmlText with style sheet set.

Currently, the implementation is coupled with AVM2 objects, that should change when AVM1 support is added.

@kjarosh kjarosh added text Issues relating to text rendering/input A-avm2 Area: AVM2 (ActionScript 3) T-compat Type: Compatibility with Flash Player labels Jan 6, 2025
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n0samu commented Jan 6, 2025

Somebody should check #14832!

@kjarosh kjarosh force-pushed the edittext-stylesheet branch from f6b3a6b to 47b37a3 Compare January 6, 2025 17:20
@kjarosh kjarosh force-pushed the edittext-stylesheet branch from 47b37a3 to 36e761b Compare January 6, 2025 17:31
This makes it easier to access style sheet in Rust.
This patch adds TextField.styleSheet support.  Now when parsing HTML,
the attached style sheet is used to provide styles for HTML elements.

This patch also adds support for:
* `class` attributes in HTML,
* `<span>` HTML elements,
* custom HTML elements.

CSS support is spanned across all existing HTML elements and custom ones.

Additionally, some observable behaviors related to .styleSheet are
implemented, e.g. performing relayout after setting .styleSheet,
or .text behaving as .htmlText with style sheet set.

Currently, the implementation is coupled with AVM2 objects, that
should change when AVM1 support is added.
This test verifies the behavior of TextField.styleSheet
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@Dinnerbone Dinnerbone left a comment

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Amazing!

@kjarosh
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kjarosh commented Jan 7, 2025

Before merging, I'm thinking I unnecessarily rewrote _styles to Rust. I could probably simplify the code a lot by moving it back to AS 🤔 (I'll look into it tomorrow)

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A-avm2 Area: AVM2 (ActionScript 3) newsworthy T-compat Type: Compatibility with Flash Player text Issues relating to text rendering/input waiting-on-review Waiting on review from a Ruffle team member
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