When I'm in darkmode, and I resize the window quic...

# compose-desktop

[ursus]

When I'm in darkmode, and I resize the window quickly, it seems that the compose ui is not keeping up & I'm seeing flashes of the "window" underneath. Am I doing something wrong?

fun main(args: Array<String>) {
    singleWindowApplication(
        title = "Git Gooey",
        state = WindowState(size = DpSize(width = 1600.dp, 960.dp))
    ) {
        App()
    }
}

@Composable
private fun App() {
    AppTheme {
        Surface(color = MaterialTheme.colorScheme.background) {
            MainPanes()
        }
    }
}

Code I believe is nothing special.

Any way around that?

Screen Recording 2025-10-22 at 16.05.48.mov

[Julien Boulvert]

The white is the java swing/awt window background, you can make it transparent or the same color as your compose app

[ursus]

how? i was trying window.backgroundColor and nothing happened

[Julien Boulvert]

You have access to the window through the FrameWindowScope, you should be able to do something like window.background = Color(<r>, <g>, <b>, <a>)

[Alexander Maryanovsky]

It’s a known issue, and the workaround is indeed to use something like

/**
 * A hack to work around the window flashing its background color when closed
 * (<https://youtrack.jetbrains.com/issue/CMP-5651>).
 */
@Composable
fun WindowScope.windowBackgroundFlashingOnCloseWorkaround(background: Color) {
    LaunchedEffect(window, background) {
        window.background = java.awt.Color(background.toArgb())
    }
}

[Alexander Maryanovsky]

put that inside your Window or DialogWindow content

[ursus]

Yea thank you, I did have the right api but my dumbass called that before setting the MaterialTheme

[ursus]

AppTheme {
    val background = MaterialTheme.colorScheme.background
    LaunchedEffect(window, background) {
        window.background = java.awt.Color(background.toArgb())
    }
    MainPanes(graph)
}

this works, thank you both

[אליהו הדס]

it's work on macos but not on windows 😰

[אליהו הדס]

and it's work too on linux