NavGen
A sample compose navigation destination code generation with kotlin symbols processing.
Usage/Examples
There are two screens , ScreenA (start destination) and ScreenB
@Destination("screen_a")
class ScreenA {
}
@Destination("screen_b")
data class ScreenB(
val message : String
)
ScreenA want to pass message string to ScreenB.
Generated Code
For ScreenA
public object ScreenADestination {
public fun destination(): String = "screen_a"
public fun route(): String = "screen_a"
}
For ScreenB
public object ScreenBDestination {
public val MESSAGE: String = "message"
public fun destination(): String = "screen_b?message={message}"
public fun route(message: String): String = "screen_b?message=${message}"
public fun message(bundle: Bundle): String = bundle.getString("message")!!
public fun types() = listOf(androidx.navigation.navArgument("message"){
type = androidx.navigation.NavType.StringType
nullable = false
})
}
Example Usage
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
ComposeNavGenTheme {
val navController = rememberNavController()
NavHost(
navController = navController,
startDestination = ScreenADestination.destination()
) {
composable(
route = ScreenADestination.destination()
) {
ScreenA {
navController.navigate(
ScreenBDestination.route("Hello i am from A")
)
}
}
composable(
arguments = ScreenBDestination.types(),
route = ScreenBDestination.destination()
) {
ScreenB(
ScreenBDestination.message(it.arguments!!)
)
}
}
}
}
}
}
@Composable
fun ScreenA(onClick: () -> Unit) {
Box(modifier = Modifier.fillMaxSize()) {
Button(
onClick = onClick, modifier = Modifier.align(
Alignment.Center
)
) {
Text(text = "Go to B")
}
}
}
@Composable
fun ScreenB(message: String) {
Box(modifier = Modifier.fillMaxSize()) {
Text(
text = message, modifier = Modifier.align(
Alignment.Center
)
)
}
}
Limination
Currently not available default parameters and only available primitive types but not a Double , because of NavType.DoubleType not support by compose navigation.
