Jetpack Compose Desktop switch to new window

Question

Hey I'm pretty new to Kotlin and am trying my hand at a GUI as my first small project.
For this I am using Jetpack Compose Desktop. I have already written a first small login window ( not the one in the GIF), and would like to open a new window with the "actual" content after logging in (not an external one, but in the same window).
Here is a video that may help you to understand what I mean:

(Not mine but thanks to Agon Mustafa - uplabs)

So that one continues with the registration in the same window and does not have to open a separate window for it. Hope you can help me:)

Answer 1

Here is an example of how to open and close multiple windows:

fun main() = application {
    val applicationState = remember { MyApplicationState() }

    for (window in applicationState.windows) {
        key(window) {
            MyWindow(window)
        }
    }
}

@Composable
private fun ApplicationScope.MyWindow(
    state: MyWindowState
) = Window(onCloseRequest = state::close, title = state.title) {
    MenuBar {
        Menu("File") {
            Item("New window", onClick = state.openNewWindow)
            Item("Exit", onClick = state.exit)
        }
    }
}

private class MyApplicationState {
    val windows = mutableStateListOf<MyWindowState>()

    init {
        windows += MyWindowState("Initial window")
    }

    fun openNewWindow() {
        windows += MyWindowState("Window ${windows.size}")
    }

    fun exit() {
        windows.clear()
    }

    private fun MyWindowState(
        title: String
    ) = MyWindowState(
        title,
        openNewWindow = ::openNewWindow,
        exit = ::exit,
        windows::remove
    )
}

private class MyWindowState(
    val title: String,
    val openNewWindow: () -> Unit,
    val exit: () -> Unit,
    private val close: (MyWindowState) -> Unit
) {
    fun close() = close(this)
}

You can read more in the tutorials of Compose for desktop