lelandrichardson

class FancyBox : View() { /* ... */ }
class Story : View() { /* ... */ }
class EditForm : FormView() { /* ... */ }
class FancyStory : ??? { /* ... */ }
class FancyEditForm : ??? { /* ... */ }

lelandrichardson

@Composable
fun FancyBox(children: @Composable () -> Unit) {
  Box(fancy) { children() }
}
@Composable fun Story(…) { /* ... */ }
@Composable fun EditForm(...) { /* ... */ }
@Composable fun FancyStory(...) {
  FancyBox { Story(…) }
}
@Composable fun FancyEditForm(...) {

lelandrichardson

@Composable
fun App(appData: AppData) {
  val derivedData = compute(appData)
  Header()
  if (appData.isOwner) {
    EditButton()
  }
  Body {
    for (item in derivedData.items) {
      Item(item)

lelandrichardson

fun Address(
  $composer: Composer,
  $static: Int,
  number: Int, street: String, 
  city: String, state: String, zip: String
) {
  Text($composer, ($static and 0b11) and (($static and 0b10) shr 1), "$number $street")
  Text($composer, ($static and 0b100) shr 2, city)
  Text($composer, 0b1, ", ")
  Text($composer, ($static and 0b1000) shr 3, state)

lelandrichardson

fun bind(liveMsgs: LiveData<MessageData>) {
  liveMsgs.observe(this) { msgs ->
    updateBody(msgs)
  }
}

lelandrichardson

@Composable
fun Messages(liveMsgs: LiveData<MessageData>) {
 val msgs by liveMsgs.observeAsState()
 for (msg in msgs) {
   Message(msg)
 }
}

lelandrichardson

// function declaration
suspend fun MyFun() { … }
 
// lambda declaration
val myLambda = suspend { … }
 
// function type
fun MyFun(myParam: suspend () -> Unit) { … }

lelandrichardson

// function declaration
@Composable fun MyFun() { … }
 
// lambda declaration
val myLambda = @Composable { … }
 
// function type
fun MyFun(myParam: @Composable () -> Unit) { … }

lelandrichardson

fun Example(a: () -> Unit, b: suspend () -> Unit) {
   a() // allowed
   b() // NOT allowed
}
 
suspend 
fun Example(a: () -> Unit, b: suspend () -> Unit) {
   a() // allowed
   b() // allowed
}

lelandrichardson

fun Example(a: () -> Unit, b: @Composable () -> Unit) {
   a() // allowed
   b() // NOT allowed
}
 
@Composable 
fun Example(a: () -> Unit, b: @Composable () -> Unit) {
   a() // allowed
   b() // allowed
}