Lambda parameter

[TBSten]

Add a function type like () -> Unit to the default types that Gallery can display. This will enhance the Composable manual test review experience.

In addition, the following points should be kept in mind to create a more meaningful UI Catalog.

• Provide some kind of feedback when an event occurs.
  • Display Snackbar.
  • Displays detailed information about the invoked event.
• Support events with arguments and return value. This has a significant effect when MVI is employed.
• It would be even better to have a UI like BottomSheet (or Drawer, Dialog) that lists the events that have occurred.
• @Composable () -> Unit, so that lambdas such as A can also be accepted. It is very common for UI components to provide a Slot argument.
  • It would be better if the size, position, and number of elements to be placed were editable. This is because a Slot may have child elements of various sizes.

Usage example

val `MyButton with onEvent parameter` by story {
  // `lambdaParameter()` function by 
  val onClick: /* () -> Unit */ by lambdaParameter()

  // With type parameter
  val onIntent: (MyIntent) -> Unit by lambdaParameter<MyIntent, Unit>()

  // With return value
  val getMyData: /* () -> MyData */ by lambdaParameter<MyData>()

  // With event label
  //   - This is useful to distinguish between multiple parameters of a function type. 
  val onClickWithLabel: /* () -> Unit */ by parameter(label = "onClick" /* Might as well have it set up automatically. */)

  MyButton(
    onClick = onClick,
  )

  MyScreen(
    onIntent = onIntent,
    getMyData = getMyData,
  )
}