Can anyone share how to remember window state (in ...

# compose-desktop

[Sebastian Schuberth]

Can anyone share how to remember window state (in particular size) of the main windows across app restarts? I tried to wrap rememberWindowState in rememberSaveable but keep getting "@Composable invocations can only happen from the context of a @Composable function" although I've moved the code already to a `@Composable`function:

fun main() = application {
    createMainWindow { ::exitApplication }
}

@Composable
fun createMainWindow(onCloseRequest: () -> Unit) {
    val rememberedState =  rememberSaveable { rememberWindowState(width = Dp.Unspecified, height = Dp.Unspecified) }
    Window(
        onCloseRequest = onCloseRequest,
        state = rememberedState,
        title = "Stan"
    ) {
        var text by remember { mutableStateOf("Hello, World!") }

        Button(onClick = { text = "Hello, Desktop!" }) {
            Text(text)
        }
    }
}

[zt]

You can't do a remember inside remember
What do you mean by app restarts? Completely exiting and reopening? If that's what you mean then you'll have to store the window state to a file

[Sebastian Schuberth]

> What do you mean by app restarts? Completely exiting and reopening?
Yes.
> If that's what you mean then you'll have to store the window state to a file
Ok, bummer, I thought that's exactly what rememberSaveable saves be to do manually.

[zt]

yea
rememberSaveable is really only useful on Android

[Ivan Matkov]

rememberSaveable wipes the data when user explicitly closes the app on android. It's for things like restart due to config changes or memory optimizations.

If you need a custom behaviour - it can be provided via LocalSaveableStateRegistry

[Ivan Matkov]

rememberSaveable is really only useful on Android

Nope - it's used for saving things like scroll position during navigation back

[zt]

Oh, didn't know that

[mikehearn]

There is a native macOS system for this

[mikehearn]

You could use it on that platform