Is the background blur achievable? It would help a...

# compose-desktop

[Richard Glen]

Is the background blur achievable? It would help a lot if there’s a sample project that does something similar. Thanks!

[Kirill Grouchnikov]

See here. You’ll need to apply the blur effect on the panel behind your “popup”, as render effects can only be applied within the rendering pass of the matching content. That is, you can’t apply a blur, for example, on an unrelated piece in your UI hierarchy. Only that piece can apply a blur on itself.

[Richard Glen]

Thanks! However RuntimeShaderBuilder class is not resolved. Would you know where can I find this? @Kirill Grouchnikov

[Kirill Grouchnikov]

You can’t use that in commonMain. It’s only available in desktopMain.

[Kirill Grouchnikov]

Full code is here.

[Richard Glen]

Oh. Thanks. I was running it under jvmMain.

[Richard Glen]

Thanks a lot bro!

[Richard Glen]

Ohh, its only blurring the desktop app and not the window of a different app.

[Kirill Grouchnikov]

Sure, how would it be able to blur another app’s content? That would be an OS-level feature

[Kirill Grouchnikov]

For that you can look into what https://github.com/MayakaApps/ComposeWindowStyler offers

[Richard Glen]

Thanks a lot for the help!

Unfortunately, the demo is not working. Probably an issue with Apple Silicon?

[Kirill Grouchnikov]

Read the documentation to see which effects are supported on specific OS versions

[Richard Glen]

Yep. Submitted this . Thanks again!

[Richard Glen]

I wish I could help debug this issue. I’m open to help. (Will have to manage time tho)

[Kirill Grouchnikov]

There’s nothing to debug on non-Windows platforms, as the current implementation only supports Windows OS effects. You can see that in the source code over here.

Different OSs support different effects. On macOS there’s NSVisualEffectView (see documentation) for individual views which may or may not be what you’re looking for. You would need to figure out how to make JNI bindings for those APIs (see here for some examples) and how to wire those bindings upwards into the Compose world.

[Richard Glen]

It’s clear just how much little i know about this. Thanks a lot for the help.
I’ll try studying this.