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Theme plugin system (experimental) (#8153)

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# What it does

Addition of a new system of theme plugins which allow the user to use
different rules engine to compute the style for the available
specialised widget style.

# How to use

Create a engine implementing the trait `ThemePlugin` and `ThemeStyle<S:
StyleStruct>` and implement the necessary methods, then register this
way (example for `ButtonStyle`):
```ui.add_theme::<ButtonStyle>(&mycustomengine);```

Now all button will call the `ThemeStyle<ButtonStyle>` method to compute the correct style and later use the cached value to avoid the costly computation.

If no valid `ThemeStyle<S>` or engine is available then it fallback to the default style.

* Closes part of <https://github.com/emilk/egui/issues/3284>
* [x] I have followed the instructions in the PR template

---------

Co-authored-by: adrien <221212@umons.ac.be>
Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: Lucas Meurer <hi@lucasmerlin.me>
This commit is contained in:
YouStones
2026-08-21 15:05:45 +02:00
committed by GitHub
parent f5c9373e26
commit 97603fc082
21 changed files with 857 additions and 336 deletions
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6
crates/eframe/Cargo.toml
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@@ -53,6 +53,12 @@ android-native-activity = ["egui-winit/android-native-activity"]
## If you plan on specifying your own fonts you may disable this feature.
default_fonts = ["egui/default_fonts"]
## Enable experimental egui features that might have massive breaking changes or be removed entirely in future updates.
## Enabling this won't break semver, it's just future compatibility risk.
##
## Currently, this enables the theme plugin.
experimental = ["egui/experimental"]
## Enable [`glow`](https://github.com/grovesNL/glow) for painting, via [`egui_glow`](https://github.com/emilk/egui/tree/main/crates/egui_glow).
##
## There is generally no need to enable both the `wgpu` and `glow` features,