Jetpack compose for desktop: run application in background?-CodePudding

i am new to the jetpack compose. I did a lot of research on that topic but i can't find anything useful. What i wanna achieve is that if I close my window, my application will stay in the background and can be opened again from the tray. I managed to create the tray, but when i close the application window it closes the whole application. How can i achieve that?

This application will be on Windows and MacOS only. I don't care about android right now

CodePudding user response：

Edit: For version 0.4.0

I managed to figure it out. The main function should be an application, not the window

@OptIn(ExperimentalComposeUiApi::class)
fun main() = application { 
    
}

And if the application contains both the Window and the Tray, it will continue to run in the background and does not close after the window is closed.

@OptIn(ExperimentalComposeUiApi::class)
fun main() = application {

    Tray(
        icon = BufferedImage(24, 24, 1),
        menu = {
            Item(
                "Exit",
                onClick = { exitProcess(1) }
            )
        }
    )

    Window{
        Text("Hello World")
    }

}

Edit: For version 1.0.0-beta5

Now you have to specify the onCloseRequest on the window object, if you leave it blank it won't close the window. In the application, create a variable which will indicate whether the window is open or not. Create the tray as before. The tray icon now requires a Painter object instead of a BufferedImage. Than simply check if the window open state is true, show the window, otherwise do nothing.

@OptIn(ExperimentalComposeUiApi::class)
fun main() = application {
    val isOpen = remember { mutableStateOf(true)}
    Tray(
        icon = TrayIcon,
        menu = {
            Item(
                "Exit",
                onClick = { exitApplication() }
            )
        }
    )
    if(isOpen.value){
        Window(
            onCloseRequest = { isOpen.value = false }
        ) {
            MaterialTheme {
                Text("Hello World")
            }
        }
    }
}

object TrayIcon : Painter() {
    override val intrinsicSize = Size(256f, 256f)
    override fun DrawScope.onDraw() {
        drawOval(Color(0xFFFFA500))
    }
}