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<!-- Please read the "Making a PR" section of [`CONTRIBUTING.md`](https://github.com/emilk/egui/blob/main/CONTRIBUTING.md) before opening a Pull Request! * Keep your PR:s small and focused. * The PR title is what ends up in the changelog, so make it descriptive! * If applicable, add a screenshot or gif. * If it is a non-trivial addition, consider adding a demo for it to `egui_demo_lib`, or a new example. * Do NOT open PR:s from your `master` branch, as that makes it hard for maintainers to test and add commits to your PR. * Remember to run `cargo fmt` and `cargo clippy`. * Open the PR as a draft until you have self-reviewed it and run `./scripts/check.sh`. * When you have addressed a PR comment, mark it as resolved. Please be patient! I will review your PR, but my time is limited! --> # 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>
GUI implementation
This is the core library crate egui. It is fully platform independent without any backend. You give the egui library input each frame (mouse pos etc), and it outputs a triangle mesh for you to paint.