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Release 0.35.0 - Inspection, egui_mcp, classes and improved IME (#8268)

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Lucas Meurer
2026-06-25 20:48:18 +02:00
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@@ -14,6 +14,118 @@ This file is updated upon each release.
Changes since the last release can be found at <https://github.com/emilk/egui/compare/latest...HEAD> or by running the `scripts/generate_changelog.py` script.
## 0.35.0 - 2026-06-25 - Inspection, egui_mcp, classes and improved IME
### Highlights
- New egui_mcp crate based on eguis new inspection protocol
- Set classes on your `Ui`s to modify widget behavior based on surrounding context
- Improved IME
### Egui inspection and egui_mcp
This release includes a new inspection protocol for egui. It allows reading the accesskit tree of a running app, as well
as sending events to control it. It's implemented via a new `InspectionPlugin` in the `egui_inspection` crate.
Eframe includes a new `inspection` feature. When enabled, you can enable inspection by launching the app with
`EGUI_INSPECTION=1`. This will cause the app to listen on port 5719.
The first inspection protocol consumer is [egui_mcp](https://github.com/rerun-io/kittest_inspector/tree/main/crates/egui_mcp).
It's a [mcp](https://modelcontextprotocol.io/docs/getting-started/intro) server that allows your agent to see and use
egui apps. It can be used to have the agent use the app, reproduce bugs and verify its changes.
Install it via `cargo install --git https://github.com/rerun-io/kittest_inspector egui_mcp` and then add it to your
agent via `claude mcp add egui egui-mcp`.
There is also a plan of adding a general inspection gui using the same protocol, that can e.g. be used to step through
kittest tests frame by frame.
Here is claude using the mcp to try some of the egui demos (sped up by a lot, claude is slow):
https://github.com/user-attachments/assets/c3dd0456-acfc-428c-8efe-f4a244c9e3ba
* Add `egui_inspection` protocol and plugin [#8234](https://github.com/emilk/egui/pull/8234) by [@lucasmerlin](https://github.com/lucasmerlin)
### Classes
As part of [css like styling](https://github.com/emilk/egui/issues/3284), we've added classes to egui. You can already
use them to e.g. modify widget behavior or styling based on surrounding context.
Add classes to the container:
```rs
ui.scope_builder(UiBuilder::new().with_class("my_container"), |ui| {
...
});
```
In your widget, check if we're in `my_container`, to e.g. change sizes or colors:
```rs
let in_container = ui.stack().iter().any(|s| s.classes.has("my_container"));
```
Today this only works for custom widgets and ui code, but the next step will be a styling system that allows you to modify built
in widget styling based on these classes.
* Add `Classes` to `UiBuilder` and some Widgets [#7843](https://github.com/emilk/egui/pull/7843) by [@AdrienZianne](https://github.com/AdrienZianne)
### Better IME composition
IME visuals received an overhaul, they are now indicated by an underline and properly show the cursor during composition:
https://github.com/user-attachments/assets/487c7e7c-ef6d-4a86-8dbc-8c71871b4470
* Implement proper visuals for IME composition [#8083](https://github.com/emilk/egui/pull/8083) by [@umajho](https://github.com/umajho)
### ⭐ Added
* Add `Classes` to `UiBuilder` and some Widgets [#7843](https://github.com/emilk/egui/pull/7843) by [@AdrienZianne](https://github.com/AdrienZianne)
* Drag-to-close panels [#8182](https://github.com/emilk/egui/pull/8182) by [@emilk](https://github.com/emilk)
* Add `AtomKind::Layout`, for nesting `AtomLayout` [#8219](https://github.com/emilk/egui/pull/8219) by [@lucasmerlin](https://github.com/lucasmerlin)
* Add `AtomLayout::direction` [#8221](https://github.com/emilk/egui/pull/8221) by [@lucasmerlin](https://github.com/lucasmerlin)
* Make the size of tabs and thin space configurable [#8070](https://github.com/emilk/egui/pull/8070) by [@emilk](https://github.com/emilk)
* Add `subpixel_binning` to `TextOptions` and `FontTweak` [#8072](https://github.com/emilk/egui/pull/8072) by [@emilk](https://github.com/emilk)
* Allow `Atoms` in `Ui::small_button` [#8159](https://github.com/emilk/egui/pull/8159) by [@lucasmerlin](https://github.com/lucasmerlin)
* Atom support for `egui::Window` Titlebar [#8154](https://github.com/emilk/egui/pull/8154) by [@lucasmerlin](https://github.com/lucasmerlin)
* Add `AsId` and `IdSalt` [#8184](https://github.com/emilk/egui/pull/8184) by [@emilk](https://github.com/emilk)
* Add Context::set_cursor_image for OS-level custom cursors [#8155](https://github.com/emilk/egui/pull/8155) by [@all3f0r1](https://github.com/all3f0r1)
* Add `ViewportBuilder::with_monitor` + `ViewportCommand::SetMonitor` [#8140](https://github.com/emilk/egui/pull/8140) by [@Le-Syl21](https://github.com/Le-Syl21)
* Add modifier keys to `egui::Key` [#8127](https://github.com/emilk/egui/pull/8127) by [@Le-Syl21](https://github.com/Le-Syl21)
* Expose interactive rects from the last pass [#8211](https://github.com/emilk/egui/pull/8211) by [@psyche314](https://github.com/psyche314)
* Add `AtomLayout::selectable` for opt-in text selection [#8224](https://github.com/emilk/egui/pull/8224) by [@akagifreeez](https://github.com/akagifreeez)
* Add `LayoutJob::format_at_byte` [#8244](https://github.com/emilk/egui/pull/8244) by [@emilk](https://github.com/emilk)
* Add `atoms()` helpers to get `Atoms` from widgets [#8128](https://github.com/emilk/egui/pull/8128) by [@Nashvill375](https://github.com/Nashvill375)
### 🔧 Changed
* Improve IME handling, add public method `owns_ime_events` on `Memory` [#7983](https://github.com/emilk/egui/pull/7983) by [@umajho](https://github.com/umajho)
* Use `harfrust` for better kerning and ligatures [#8031](https://github.com/emilk/egui/pull/8031) by [@gcailly](https://github.com/gcailly)
* Rework `Window` margins and set `clip_rect_margin` to zero [#7725](https://github.com/emilk/egui/pull/7725) by [@emilk](https://github.com/emilk)
* Slide panels when animating them [#8175](https://github.com/emilk/egui/pull/8175) by [@emilk](https://github.com/emilk)
* Slow down animation time from 0.1s to 0.2s [#8176](https://github.com/emilk/egui/pull/8176) by [@emilk](https://github.com/emilk)
* Smoother CollapsingHeader animation [#8177](https://github.com/emilk/egui/pull/8177) by [@emilk](https://github.com/emilk)
* Drag-to-scroll: now only on touch screens [#8181](https://github.com/emilk/egui/pull/8181) by [@emilk](https://github.com/emilk)
* `Window`: move only by dragging title bar [#8183](https://github.com/emilk/egui/pull/8183) by [@emilk](https://github.com/emilk)
* Rename `Panel` methods [#8192](https://github.com/emilk/egui/pull/8192) by [@emilk](https://github.com/emilk)
* Panels: double-click resize edge to toggle [#8193](https://github.com/emilk/egui/pull/8193) by [@emilk](https://github.com/emilk)
* Rename `AlphaFromCoverage` to `FontColorTransferFunction` [#8201](https://github.com/emilk/egui/pull/8201) by [@emilk](https://github.com/emilk)
* Smoother collapsed-panel animation [#8202](https://github.com/emilk/egui/pull/8202) by [@emilk](https://github.com/emilk)
* Improve `Debug`-formatting of `Id` in debug-builds [#8190](https://github.com/emilk/egui/pull/8190) by [@emilk](https://github.com/emilk)
* Use strongly typed `CharIndex` and `ByteIndex` + bug fixes [#8245](https://github.com/emilk/egui/pull/8245) by [@emilk](https://github.com/emilk)
* Allow downscaling image in `GetScreenshot` inspection request [#8248](https://github.com/emilk/egui/pull/8248) by [@lucasmerlin](https://github.com/lucasmerlin)
* Announce pressed state of selectable buttons to screen readers [#8130](https://github.com/emilk/egui/pull/8130) by [@antoinecellerier](https://github.com/antoinecellerier)
* Pre-populate font variation axes in the `FontTweak` UI [#8258](https://github.com/emilk/egui/pull/8258) by [@emilk](https://github.com/emilk)
* Make font hinting target configurable via `FontTweak` [#8262](https://github.com/emilk/egui/pull/8262) by [@emilk](https://github.com/emilk)
### 🔥 Removed
* Remove everything that was marked `#[deprecated]` [#8105](https://github.com/emilk/egui/pull/8105) by [@emilk](https://github.com/emilk)
* Remove 64-bit atomics in main crate [#8037](https://github.com/emilk/egui/pull/8037) by [@kay-lambdadelta](https://github.com/kay-lambdadelta)
* Remove `impl Into<f32>` arguments [#8194](https://github.com/emilk/egui/pull/8194) by [@emilk](https://github.com/emilk)
### 🐛 Fixed
* Don't hide whitespaces in centered and right aligned text edits [#8102](https://github.com/emilk/egui/pull/8102) by [@lucasmerlin](https://github.com/lucasmerlin)
* Don't allow resizing past minimum content size [#8152](https://github.com/emilk/egui/pull/8152) by [@lucasmerlin](https://github.com/lucasmerlin)
* Fix resizing of `Grid` [#8170](https://github.com/emilk/egui/pull/8170) by [@lucasmerlin](https://github.com/lucasmerlin)
* Fix glyph caching on font variations [#8189](https://github.com/emilk/egui/pull/8189) by [@emilk](https://github.com/emilk)
* `Panel`: never overflow available width, nor `max_width` [#8198](https://github.com/emilk/egui/pull/8198) by [@emilk](https://github.com/emilk)
* Fixes color picker hue drift at low alpha values [#8208](https://github.com/emilk/egui/pull/8208) by [@aedm](https://github.com/aedm)
* Fix: ScrollArea layout jitter with floating bars and zoom levels [#7944](https://github.com/emilk/egui/pull/7944) by [@rustbasic](https://github.com/rustbasic)
* Fix #2142 - lost_focus not firing after a mid-frame focus transfer [#8210](https://github.com/emilk/egui/pull/8210) by [@ufoscout](https://github.com/ufoscout)
* Fix label selection in deferred viewports [#8242](https://github.com/emilk/egui/pull/8242) by [@yay](https://github.com/yay)
## 0.34.3 - 2026-05-27
* Fix `ScrollArea::scroll_to_*` calls when `stick_to_bottom` is Active [#8033](https://github.com/emilk/egui/pull/8033) by [@AmmarAbouZor](https://github.com/AmmarAbouZor)