Created
February 27, 2020 05:26
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LiveData粘性事件包装
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package com.whdx.library_login.bean | |
/** | |
* @author yyz (杨云召) | |
* @date 2020/2/27 | |
* time 11:34 | |
* description | |
* 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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