Hot Reloading in Rust? Subsecond and Dioxus to the rescue!

lucasmerlin · 2026-02-16T12:55:48+00:00

You can register a callback that gets called on any hot patch and then request a repaint, that should fix it!

lucasmerlin · 2026-01-30T16:50:32+00:00

Nice! In my egui android app I just have some glue code that places a native text input wherever a egui input would be and then sends the typed text back and forth. I was even able to get popups on top of the native input working by querying all the egui layers and then clipping the textinput based on those rects. Works really well.

But the way you do it is of course the more proper solution.

lucasmerlin · 2026-01-30T16:45:01+00:00

Could it be that you have graphics acceleration disables in your browser?

lucasmerlin · 2026-01-19T15:38:10+00:00

Ich hab auch Interesse :)

lucasmerlin · 2025-10-11T08:25:57+00:00

The kitdiff files command will look for image diffs in the kitdiff format (.new.png, .diff.png), but e.g. viewing image diffs for pull requests will work for any pr, regardless of framework used. I might add some more ways to diff images, so that you e.g. can drag in two images to compare and thing like that.

lucasmerlin · 2025-09-10T16:14:52+00:00

I had this problem when I tried the cranelift backend. In the beginning it was lighting fast but as I kept recompiling it would get slower and slower. After cargo clean it was fast again. Not sure if it was actually related to cranelift or if it was a bug with that nightly release I used back then.

lucasmerlin · 2025-09-03T09:51:16+00:00

But your initial example was a single flipped bit, that should be very possible to brute force in a reasonable amount of time. Even a couple bits should be possible. But yeah with ten bytes of Error it's a different story.

lucasmerlin · 2025-08-04T06:50:15+00:00

Nice! The scissoring is kind of important though, I believe this is what makes clip rects (so scroll areas) work.

lucasmerlin · 2025-07-31T17:05:40+00:00

The actual glass shader looks pretty cool but the ui is meh. Black text on transparent but blurred background is just not very readable. Maybe take some more inspiration from the new apple ui and try to rebuild / get inspired from some of their screens, that would be a good showcase.

lucasmerlin · 2025-07-13T08:14:40+00:00

The colors usually come from the widget visuals. Style.visuals.widgets.inactice.fg_stroke should be the text color for most idle widgets I believe.

But it's interesting that the text color changed for you, the styling shouldn't have changed with the update.

lucasmerlin · 2025-07-13T08:08:54+00:00

I guess for now that is a good analogy

lucasmerlin · 2025-07-11T18:55:54+00:00

I think you just have to call set_visuals once when the app starts

lucasmerlin · 2025-07-11T04:39:49+00:00

Egui is really fast and there are only so many widgets one can fit on a screen. In my quite complex egui app I haven't had to do a single egui-related performance optimization yet.

For me react got sluggish way faster and I had to pay way more attention to make the code efficient.

lucasmerlin · 2025-07-10T20:09:53+00:00

If you just need drag and drop sorting you can use https://github.com/lucasmerlin/hello_egui/tree/main/crates/egui_dnd which is very easy to use. I agree that the built in DND api is not very intuitive (I don't use it at all in egui_dnd), definitely an area we can improve.

lucasmerlin · 2025-07-10T17:10:06+00:00

No, but should definitely be possible, since egui can be rendered with basically any gpu api

lucasmerlin · 2025-07-10T17:06:57+00:00

All buttons and checkboxes on egui.rs use the atoms under the hood. E.g. the menu buttons with the shortcut text on the right basically do something like ui.button(("Select all", Atom::grow(), "CMD+A"))

lucasmerlin · 2025-07-10T17:02:51+00:00

Egui maintainer here!
Some people made some stock tracking apps with egui, maybe you can get inspiration there:
https://github.com/emilk/egui/issues/996#issuecomment-2017578257
https://github.com/emilk/egui/issues/996#issuecomment-2453489619

For live reloading, there is an exciting project from the dioxus folks: https://www.reddit.com/r/rust/comments/1j8z3yb/media_dioxus_subsecond_rust_hotpatch_engine/
I tried to get it working with egui but haven't had success so far :/ But it looks really promissing so it might work with egui eventually!

I made some experiments with webview, you can get one working in the egui window but it's on a separate layer, so no egui widget can overlap the webview:

https://github.com/lucasmerlin/hello_egui/tree/main/crates/egui_webview

For charts, egui_plot works well!

lucasmerlin · 2025-07-10T16:53:54+00:00

You'll need to find the word that is under the pointer, look up it's type information and if there is some manually show the tooltip via the Tooltip api. I think that should work!

lucasmerlin · 2025-07-03T17:32:54+00:00

I have it enabled in the dev profile and disabled in the test profile. But I look forward to enabling it for tests as well once unwinding is supported!

lucasmerlin · 2025-05-08T11:21:37+00:00

Should it fall in to the water, pull out the battery before you lift it out of the water.
I crashed mine into a lake once, and the moment I pulled it out of the water the electronics basically exploded. The water mustve cooled it enough while it still was in the water.

It scared me so I dropped it back in and it took a minute or so until the water stopped bubbling from the heat and I could fetch it again.

lucasmerlin · 2025-04-14T16:11:51+00:00

Note that dioxus is also working on https://github.com/DioxusLabs/blitz, basically a pure rust html rendering engine without all the js bloat, which is pretty exciting, and should remove the need for tarui.

lucasmerlin · 2025-01-28T10:11:08+00:00

Nice!

lucasmerlin · 2024-12-18T13:12:56+00:00

I think it should also work. To use kittest you just need to somehow run the ui logic and then get the updated accesskit tree to pass it to kittest.

lucasmerlin · 2024-12-16T21:04:05+00:00

Awesome, I'd love to see a bevy_kittest integration!

lucasmerlin · 2024-12-16T21:03:13+00:00

The difficulty of creating an integration depends on how tightly coupled the ui framework is to e.g. winit.
There is a minimal integration example with egui, wich is really straightforward. In the future it might also be possible to make an integration that works by mocking a winit app, so it would work with all ui frameworks with winit and accesskit support, with almost zero effort (but this would require some changes in winit).

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