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Expose val instead of var

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This commit is contained in:
Him188 2020-01-17 12:04:00 +08:00
parent c9ac5d6185
commit 2b427173ab
1 changed files with 7 additions and 5 deletions

12
mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/Subscribable.kt
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@ -28,11 +28,13 @@ abstract class Event : Subscribable {
/**
* 事件是否已取消. 事件需实现 [Cancellable] 才可以被取消, 否则这个字段为常量值 false
*/
var cancelled: Boolean = false
val cancelled: Boolean get() = _cancelled
private var _cancelled: Boolean = false
get() = field.takeIf { this is Cancellable } ?: false
private set(value) = if (this is Cancellable) {
check(!field); field = value
} else throw UnsupportedOperationException()
private set(value) =
if (this is Cancellable) field = value
else throw UnsupportedOperationException()
/**
* 取消事件. 事件需实现 [Cancellable] 才可以被取消
@ -40,7 +42,7 @@ abstract class Event : Subscribable {
* @throws UnsupportedOperationException 如果事件没有实现 [Cancellable]
*/
fun cancel() {
cancelled = true
_cancelled = true
}
}