Pass data to previous composable screens

[GvHarish9894]

Feature need to pass data to previous composable screens like traditional android navigation library previousBackStackEntry kind of function

[newstrong]

It's necessary.

[Khudoyshukur]

I did a custom workaround for passing data between composables. One composable sets the result and another composable can fetch it by its key. After the result consumed, it is cleared from the memory.

// NavigationResult.kt
private val screenResults = hashMapOf<String, Any?>()

fun <T: Any> Navigator.getScreenResult(key: String): T? {
    val result = screenResults[key]
    screenResults[key] = null

    return result as? T
}

fun Navigator.setScreenResult(key: String, result: Any) {
    screenResults[key] = result
}

class ScreenA : Screen {

    @Composable
    override fun Content() {
        val navigator = LocalNavigator.current

        LaunchedEffect(Unit) {
            val screenResult = navigator?.getScreenResult<String>("MY_RESULT")
            println("Screen result is $screenResult")
        }

        Text(
            modifier = Modifier.clickable { navigator?.push(ScreenB()) },
            text = "ClickMe"
        )
    }
}

class ScreenB : Screen {

    @Composable
    override fun Content() {
        val navigator = LocalNavigator.current

        BackHandler(
            enabled = true,
            onBack = {
                navigator?.setScreenResult("MY_RESULT", "RESULT")
                navigator?.pop()
            }
        )
    }
}