UE5学习笔记26-添加游戏热身时间，比赛时间，重新开始比赛

一、......

        1.在PlayerController类通过UGameplayStatics::GetGameState可以获得游戏状态AGameState类和子类，通过GetPlayerState可以获得APlayerState和子类

        2.在GameMode类中通过GetGameState获得GameState和子类

        3.在GameMode类中存在比赛状态的命名控件namespace MatchState，想添加新的比赛状态在GameMode的子类中模仿GameMode类在头文件和源文件添加方式添加

        4.PlayerState中GetPlayerName函数获得的时Steam上的名字

二、添加GameState类

        1.新建类

        2. 代码

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/GameState.h"
#include "BlasterGameState.generated.h"

/**
 * 
 */
UCLASS()
class BLASTER_API ABlasterGameState : public AGameState
{
	GENERATED_BODY()
public:
	virtual void GetLifetimeReplicatedProps(TArray< FLifetimeProperty >& OutLifetimeProps) const override;

	void UpdateTopScore(class ABlasterPlayerState* ScoringPlayer);

	UPROPERTY(Replicated)
	TArray<ABlasterPlayerState*> TopScoringPlayers;
private:
	float TopScore;
};

// Fill out your copyright notice in the Description page of Project Settings.


#include "BlasterGameState.h"
#include "Net/UnrealNetwork.h"
#include "Blaster/PlayerState/BlasterPlayerState.h"

void ABlasterGameState::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
	Super::GetLifetimeReplicatedProps(OutLifetimeProps);

	DOREPLIFETIME(ABlasterGameState, TopScoringPlayers);
}

void ABlasterGameState::UpdateTopScore(ABlasterPlayerState* ScoringPlayer)
{
	if (TopScoringPlayers.Num() == 0)
	{
		TopScoringPlayers.Add(ScoringPlayer);
		TopScore = ScoringPlayer->GetScore();
	}
	else if (ScoringPlayer->GetScore() == TopScore)
	{
		TopScoringPlayers.AddUnique(ScoringPlayer);
	}
	else if (ScoringPlayer->GetScore() > TopScore)
	{
		TopScoringPlayers.Empty();
		TopScoringPlayers.AddUnique(ScoringPlayer);
		TopScore = ScoringPlayer->GetScore();
	}
}

  三、创建游戏结束的界面

        2. 代码

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "Blueprint/UserWidget.h"
#include "Announcement.generated.h"

/**
 * 
 */
UCLASS()
class BLASTER_API UAnnouncement : public UUserWidget
{
	GENERATED_BODY()
public:
	UPROPERTY(meta = (Bindwidget))
	class UTextBlock* AnnouncementText;

	UPROPERTY(meta = (Bindwidget))
	UTextBlock* InfoText;

	UPROPERTY(meta = (Bindwidget))
	UTextBlock* WarmupTime;
};

        3. 在HUD类中添加新界面类的变量和函数

	UPROPERTY(EditAnywhere, Category = "Announcements")
	TSubclassOf<UUserWidget> AnnouncementClass;

	UPROPERTY()
	class UAnnouncement* Announcement;

	void AddAnnouncement();

void AABasterHUD::AddAnnouncement()
{
	APlayerController* PlayController = GetOwningPlayerController();

	if (PlayController && AnnouncementClass)
	{
		Announcement = CreateWidget<UAnnouncement>(PlayController, AnnouncementClass);
		Announcement->AddToViewport();
	}
}

        4.在PlayerController中实现HandleCool函数中实现在界面上显示的功能

private:
	UPROPERTY(ReplicatedUsing = OnRep_MatchState)
	FName MatchState;

	UFUNCTION()
	void OnRep_MatchState();

void ABlasterPlayerController::OnMatchStateSet(FName State)
{
	MatchState = State;

	if (MatchState == MatchState::InProgress)
	{
		HandleMatchHasStarted();
	}
	else if (MatchState == MatchState::Cooldown)
	{
		HandleCooldown();
	}
}

void ABlasterPlayerController::OnRep_MatchState()
{
	if (MatchState == MatchState::InProgress)
	{
		HandleMatchHasStarted();
	}
	else if (MatchState == MatchState::Cooldown)
	{
		HandleCooldown();
	}
}

void ABlasterPlayerController::HandleMatchHasStarted()
{
	BlasterHUD = BlasterHUD == nullptr ? Cast<AABasterHUD>(GetHUD()) : BlasterHUD;
	if (BlasterHUD)
	{
		BlasterHUD->AddCharacterOverlay();

		if (BlasterHUD->Announcement)
		{
			BlasterHUD->Announcement->SetVisibility(ESlateVisibility::Hidden);
		}
	}
}

void ABlasterPlayerController::HandleCooldown()
{
	BlasterHUD = BlasterHUD == nullptr ? Cast<AABasterHUD>(GetHUD()) : BlasterHUD;
	if (BlasterHUD)
	{
		BlasterHUD->CharacterOverlay->RemoveFromParent();
		bool bHUDValid = BlasterHUD->Announcement&& 
			BlasterHUD->Announcement->AnnouncementText&& 
			BlasterHUD->Announcement->InfoText;

		if (bHUDValid)
		{
			BlasterHUD->Announcement->SetVisibility(ESlateVisibility::Visible);
			FString AnnouncementText("New Match Starts In:");
			BlasterHUD->Announcement->AnnouncementText->SetText(FText::FromString(AnnouncementText));
			
			ABlasterGameState* BlasterGameState = Cast<ABlasterGameState>(UGameplayStatics::GetGameState(this));
			ABlasterPlayerState* BlasterPlayerState = GetPlayerState<ABlasterPlayerState>();
			if (BlasterGameState && BlasterPlayerState)
			{
				TArray<ABlasterPlayerState*> TopPlayers = BlasterGameState->TopScoringPlayers;
				FString InfoTextString;
				if (TopPlayers.Num() == 0)
				{
					InfoTextString = FString("There is no Winner");
				}
				else if (TopPlayers.Num() == 1 && TopPlayers[0] == BlasterPlayerState)
				{
					InfoTextString = FString("You are Winner");
				}
				else if(TopPlayers.Num() == 1)
				{
					InfoTextString = FString::Printf(TEXT("Winner: \n%s"),*TopPlayers[0]->GetPlayerName());
				}
				else if(TopPlayers.Num() > 1)
				{
					InfoTextString = FString::Printf(TEXT("Winner: \n%s"), *TopPlayers[0]->GetPlayerName());
					for (auto TiedPlayer : TopPlayers)
					{
						InfoTextString.Append(FString::Printf(TEXT("%s\n"),*TiedPlayer->GetPlayerName()));
					}
				}
				BlasterHUD->Announcement->InfoText->SetText(FText::FromString(InfoTextString));
			}
		}
	}

	ABlasterCharacter* BasterCharacter = Cast<ABlasterCharacter>(GetPawn());
	if (BasterCharacter && BasterCharacter->GetCombat())
	{
		BasterCharacter->bDisableGameplay = true;
		BasterCharacter->GetCombat()->FireButtonPressed(false);
	}
}

        5.重新启动游戏如果当前状态时Cooldown判断当前比赛时间是否结束，重新启动游戏

namespace MatchState
{
	extern BLASTER_API const FName Cooldown;// 到达了比赛持续时间，展示获胜者并开始冷却时间

}

	else if (MatchState == MatchState::Cooldown)
	{
		CountdownTime = CooldownTime + WarmupTime + MatchTime - GetWorld()->GetTimeSeconds() + LevelStartintTime;
		if (CountdownTime < 0.f)
		{
			RestartGame();
		}
	}



namespace MatchState
{
	const FName Cooldown = FName(TEXT("Cooldown"));

}