Make `CancellableEvent` an interface, introduce `AbstractCancellableEvent`

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/event/PacketReceivedEvent.kt

@@ -10,10 +10,10 @@
 package net.mamoe.mirai.qqandroid.event
 
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.event.Cancellable
+import net.mamoe.mirai.event.AbstractCancellableEvent
 import net.mamoe.mirai.event.Event
 
 /**
  * 接收到数据包
  */
-class PacketReceivedEvent(val packet: Packet) : Event(), Cancellable
+data class PacketReceivedEvent(val packet: Packet) : Event, AbstractCancellableEvent()
\ No newline at end of file

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/QQAndroidBotNetworkHandler.kt

@@ -23,11 +23,8 @@ import net.mamoe.mirai.contact.Member
 import net.mamoe.mirai.contact.MemberPermission
 import net.mamoe.mirai.data.MultiPacket
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.event.BroadcastControllable
-import net.mamoe.mirai.event.Event
-import net.mamoe.mirai.event.broadcast
+import net.mamoe.mirai.event.*
 import net.mamoe.mirai.event.events.ForceOfflineEvent
-import net.mamoe.mirai.event.subscribeAlways
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.qqandroid.GroupImpl
 import net.mamoe.mirai.qqandroid.MemberImpl
@@ -347,7 +344,7 @@ internal class QQAndroidBotNetworkHandler(bot: QQAndroidBot) : BotNetworkHandler
         }
 
         // check top-level cancelling
-        if (PacketReceivedEvent(packet).broadcast().cancelled) {
+        if (PacketReceivedEvent(packet).broadcast().isCancelled) {
             return
         }
 
@@ -360,7 +357,7 @@ internal class QQAndroidBotNetworkHandler(bot: QQAndroidBot) : BotNetworkHandler
                 packet.broadcast()
             }
 
-            if (packet is Cancellable && packet.cancelled) return
+            if (packet is CancellableEvent && packet.isCancelled) return
         }
 
         bot.logger.info("Received packet: ${packet.toString().replace("\n", """\n""").replace("\r", "")}")

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt

@@ -37,7 +37,7 @@ expect abstract class MessagePacket<TSender : QQ, TSubject : Contact>(bot: Bot)
  */ // Tips: 在 IntelliJ 中 (左侧边栏) 打开 `Structure`, 可查看类结构
 @Suppress("NOTHING_TO_INLINE")
 @MiraiInternalAPI
-abstract class MessagePacketBase<TSender : QQ, TSubject : Contact>(_bot: Bot) : EventPacket, BotEvent() {
+abstract class MessagePacketBase<TSender : QQ, TSubject : Contact>(_bot: Bot) : EventPacket, BotEvent {
     /**
      * 接受到这条消息的
      */

mirai-core/src/jvmTest/kotlin/net/mamoe/mirai/event/EventTests.kt

@@ -12,6 +12,7 @@ package net.mamoe.mirai.event
 import kotlinx.coroutines.CompletableJob
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.runBlocking
+import net.mamoe.mirai.test.shouldBeEqualTo
 import kotlin.system.exitProcess
 import kotlin.test.Test