Hello, is there any way to get the native window (...

# compose-desktop

[alexandre mommers]

Hello, is there any way to get the native window (NSWindow, X11Window, HWND ...) from a compose desktop app ?
I'm working on a Webgpu binding, and that work fine with SDL2, but using it with compose could be really interessting.

[Alexander Maryanovsky]

It’s more a question about Java/AWT

[alexandre mommers]

Compose use JFrame under the hood ? there is no window management here ?

[Alexander Maryanovsky]

Not sure what you mean by “window management”. There is some special handling, but yes, it’s a JFrame.
When you show a Window, you get a FrameWindowScope in which there’s a window: ComposeWindow property, and ComposeWindow subclasses JFrame.

[alexandre mommers]

Correct me if I'm wrong, but Compose seems to be using Skia. If I consider a platform I'm familiar with, say macOS, how does Skia access native components like NSWindow or CAMetalLayer to use the GPU API ?

[Alexander Maryanovsky]

I’m not too familiar with that part, but you can find it here: https://github.com/JetBrains/skiko

[alexandre mommers]

I Will check, thanks 🙂

[Ivan Matkov]

Compose has API to get it: window.windowHandle

See https://github.com/JetBrains/compose-multiplatform-core/blob/99c5d1d3bd7eba7dbebcd[…]topMain/kotlin/androidx/compose/ui/awt/ComposeWindow.desktop.kt

[alexandre mommers]

I need to try this on Linux and Windows, but it's working on MacOS. Thanks!
I'll post the GitHub project when the binding is a little more advanced.

compose + wbgpu.mov