From df4aa3074321d6f0aa192c0b7a4c083f6e5b5265 Mon Sep 17 00:00:00 2001
From: kercylan98 <kercylan@gmail.com>
Date: Fri, 12 May 2023 20:20:30 +0800
Subject: [PATCH] =?UTF-8?q?=E6=96=B0=E5=A2=9E=E6=8E=92=E5=90=8D=E6=94=B9?=
 =?UTF-8?q?=E5=8F=98=E4=BA=8B=E4=BB=B6?=
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---
 game/builtin/ranking_list.go | 13 +++++++++++++
 game/ranking_list.go         |  8 ++++++++
 2 files changed, 21 insertions(+)

diff --git a/game/builtin/ranking_list.go b/game/builtin/ranking_list.go
index 63738d4..dcf0b38 100644
--- a/game/builtin/ranking_list.go
+++ b/game/builtin/ranking_list.go
@@ -2,6 +2,7 @@ package builtin
 
 import (
 	"encoding/json"
+	"github.com/kercylan98/minotaur/game"
 	"github.com/kercylan98/minotaur/utils/generic"
 	"github.com/kercylan98/minotaur/utils/synchronization"
 )
@@ -23,6 +24,8 @@ type RankingList[CompetitorID comparable, Score generic.Ordered] struct {
 	rankCount   int
 	competitors *synchronization.Map[CompetitorID, Score]
 	scores      []*scoreItem[CompetitorID, Score] // CompetitorID, Score
+
+	rankChangeEventHandles []game.RankChangeEventHandle[CompetitorID, Score]
 }
 
 type scoreItem[CompetitorID comparable, Score generic.Ordered] struct {
@@ -257,3 +260,13 @@ func (slf *RankingList[CompetitorID, Score]) MarshalJSON() ([]byte, error) {
 
 	return json.Marshal(&t)
 }
+
+func (slf *RankingList[CompetitorID, Score]) RegRankChangeEvent(handle game.RankChangeEventHandle[CompetitorID, Score]) {
+	slf.rankChangeEventHandles = append(slf.rankChangeEventHandles, handle)
+}
+
+func (slf *RankingList[CompetitorID, Score]) OnRankChangeEvent(competitorId CompetitorID, oldRank, newRank int, oldScore, newScore Score) {
+	for _, handle := range slf.rankChangeEventHandles {
+		handle(competitorId, oldRank, newRank, oldScore, newScore)
+	}
+}
diff --git a/game/ranking_list.go b/game/ranking_list.go
index 8489db7..3841567 100644
--- a/game/ranking_list.go
+++ b/game/ranking_list.go
@@ -27,4 +27,12 @@ type RankingList[CompetitorID comparable, Score generic.Ordered] interface {
 	GetAllCompetitor() []CompetitorID
 	// Clear 清空排行榜
 	Clear()
+
+	// RegRankChangeEvent 排名改变时将立即执行注册的事件处理函数
+	RegRankChangeEvent(handle RankChangeEventHandle[CompetitorID, Score])
+	OnRankChangeEvent(competitorId CompetitorID, oldRank, newRank int, oldScore, newScore Score)
 }
+
+type (
+	RankChangeEventHandle[CompetitorID comparable, Score generic.Ordered] func(competitorId CompetitorID, oldRank, newRank int, oldScore, newScore Score)
+)