comment_form_create_view_state.kt

class CommentFormViewModel {
  // Let's create a view state from the data provided.
  fun createViewState(
    data: CommentFormData,
    onTextChanged: (TextChangedEvent) -> Unit,
    onSubmitSelected: (SubmitCommentEvent) -> Unit
  ): CommentFormViewState{
    val isSubmitting = data.submitRequest?.let { it.isLoading} ?: false
    return CommentFormViewState(
      textEntered = data.comment,
      isSubmitButtonEnabled = data.isCommentIsValid && !isSubmitting,
      onTextEntered = { text -> 
        onTextChanged(TextChangedEvent(text)) 
      },
      onSubmitClicked = { 
        // We assume that view will disable submit button when 
        // isSubmitButtonEnabled = false
        onSubmitClicked(SubmitCommentEvent(data.comment)) 
      }               
    )}
}