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An event wrapper for data that is exposed via a LiveData that represents an event.
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| /** | |
| * Used as a wrapper for data that is exposed via a LiveData that represents an event. | |
| */ | |
| open class Event<out T>(private val content: T) { | |
| var hasBeenHandled = false | |
| private set // Allow external read but not write | |
| /** | |
| * Returns the content and prevents its use again. | |
| */ | |
| fun getContentIfNotHandled(): T? { | |
| return if (hasBeenHandled) { | |
| null | |
| } else { | |
| hasBeenHandled = true | |
| content | |
| } | |
| } | |
| /** | |
| * Returns the content, even if it's already been handled. | |
| */ | |
| fun peekContent(): T = content | |
| } | |
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