feat: add Battle HUD(health) display

Source/FirstPersonDemo/Surviver_FPS/Battle/HealthComponent.cpp

@@ -18,12 +18,15 @@ void UHealthComponent::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& Out
 
 /**
  * @brief UHealthComponent的构造函数。
+ * @note 必须在这里初始化最大生命值，不然就有问题
  */
 UHealthComponent::UHealthComponent() {
 	// 关闭每帧Tick以提高性能
 	PrimaryComponentTick.bCanEverTick = false;
 	// 默认启用网络复制
 	SetIsReplicatedByDefault(true);
+	// 初始化当前生命值为最大生命值
+	CurrentHealth = MaxHealth;
 }
 
 /**
@@ -31,8 +34,7 @@ UHealthComponent::UHealthComponent() {
  */
 void UHealthComponent::BeginPlay() {
 	Super::BeginPlay();
-	// 初始化当前生命值为最大生命值
-	CurrentHealth = MaxHealth;
+	// OnHealthChanged.Broadcast(CurrentHealth, MaxHealth);
 }
 
 /**
@@ -40,6 +42,7 @@ void UHealthComponent::BeginPlay() {
  */
 void UHealthComponent::OnRep_CurrentHealth() {
 	// 在客户端上，当CurrentHealth被复制时调用
+	OnHealthChanged.Broadcast(CurrentHealth, MaxHealth);
 }
 
 
@@ -60,6 +63,10 @@ void UHealthComponent::HandleDamage(float DamageAmount) {
 	// 仅在服务器上处理伤害逻辑
 	if (GetOwner()->HasAuthority()) {
 		CurrentHealth = FMath::Clamp(CurrentHealth - DamageAmount, 0.0f, MaxHealth);
+		
+		// 在服务器上直接广播事件
+		OnHealthChanged.Broadcast(CurrentHealth, MaxHealth);
+		
 		if (CurrentHealth <= 0.0f) {
 			OnDeath.Broadcast();
 		}

Source/FirstPersonDemo/Surviver_FPS/Battle/HealthComponent.h

@@ -12,6 +12,13 @@
  */
 DECLARE_DYNAMIC_MULTICAST_DELEGATE(FOnDeath);
 
+/**
+ * @brief 当生命值变化时调用的多播委托。
+ * @param CurrentHealth 当前生命值
+ * @param MaxHealth 最大生命值
+ */
+DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnHealthChanged, float, CurrentHealth, float, MaxHealth);
+
 /**
  * @class UHealthComponent
  * @brief 生命组件
@@ -31,6 +38,12 @@ public:
 	UPROPERTY(BlueprintAssignable, Category = "Health")
 	FOnDeath OnDeath;
 
+	/**
+	 * @brief 生命值变化时广播的多播委托。可以在蓝图中绑定事件。
+	 */
+	UPROPERTY(BlueprintAssignable, Category = "Health")
+	FOnHealthChanged OnHealthChanged;
+
 protected:
 	/**
 	 * @brief 角色的最大生命值。
@@ -66,5 +79,11 @@ public:
 	 */
 	UFUNCTION(BlueprintCallable, Category="Health")
 	void HandleDamage(float DamageAmount);
+
+	UFUNCTION(BlueprintPure, Category="Health")
+	float GetCurrentHealth() const { return CurrentHealth; }
+
+	UFUNCTION(BlueprintPure, Category="Health")
+	float GetMaxHealth() const { return MaxHealth; }
 	
 };

Source/FirstPersonDemo/Surviver_FPS/Battle/SurviverPlayer.h

@@ -15,7 +15,7 @@ class UHealthComponent;
 /**
  * @class ASurviverPlayer
  * @brief 玩家角色基类，具有网络同步的移动组件，实现了可受伤害接口。
- * @ingroup Battle
+ * @ingroup GameCore
  */
 UCLASS()
 class FIRSTPERSONDEMO_API ASurviverPlayer : public ACharacter, public IDamageableInterface {

Source/FirstPersonDemo/Surviver_FPS/Battle/SurviverPlayerController.cpp

@@ -3,8 +3,6 @@
 
 #include "SurviverPlayerController.h"
 
-// Copyright Epic Games, Inc. All Rights Reserved.
-
 #include "EnhancedInputSubsystems.h"
 #include "Engine/LocalPlayer.h"
 #include "InputMappingContext.h"
@@ -12,6 +10,7 @@
 #include "Blueprint/UserWidget.h"
 #include "FirstPersonDemo.h"
 #include "Widgets/Input/SVirtualJoystick.h"
+#include "FirstPersonDemo/Surviver_FPS/UI/BattleHUD.h"
 
 ASurviverPlayerController::ASurviverPlayerController() {
 	// set the player camera manager class
@@ -34,6 +33,17 @@ void ASurviverPlayerController::BeginPlay() {
 			UE_LOG(LogFirstPersonDemo, Error, TEXT("Could not spawn mobile controls widget."));
 		}
 	}
+
+	// 只在本地玩家控制器上创建 HUD
+	if (IsLocalPlayerController() && BattleHUDClass) {
+		BattleHUD = CreateWidget<UBattleHUD>(this, BattleHUDClass);
+		if (BattleHUD) {
+			BattleHUD->AddToViewport();
+		}
+		else {
+			UE_LOG(LogFirstPersonDemo, Error, TEXT("Could not create BattleHUD widget."));
+		}
+	}
 }
 
 void ASurviverPlayerController::SetupInputComponent() {

Source/FirstPersonDemo/Surviver_FPS/Battle/SurviverPlayerController.h

@@ -7,8 +7,11 @@
 #include "SurviverPlayerController.generated.h"
 
 class UInputMappingContext;
+class UBattleHUD;
+
 /**
- * 
+ * @brief 玩家控制器类，包括玩家移动、玩家战斗中 HOD 的控制
+ * @ingroup GameCore
  */
 UCLASS()
 class FIRSTPERSONDEMO_API ASurviverPlayerController : public APlayerController {
@@ -18,6 +21,13 @@ public:
 	/** Constructor */
 	ASurviverPlayerController();
 
+	/** 玩家的 Battle HUD 类 */
+	UPROPERTY(EditDefaultsOnly, Category = "UI")
+	TSubclassOf<class UBattleHUD> BattleHUDClass;
+	
+	UPROPERTY()
+	UBattleHUD* BattleHUD;
+
 protected:
 
 	/** Input Mapping Contexts */
@@ -40,7 +50,10 @@ protected:
 	UPROPERTY(EditAnywhere, Config, Category = "Input|Touch Controls")
 	bool bForceTouchControls = false;
 
-	/** Gameplay initialization */
+	/**
+	 * @brief 初始化 Gameplay
+	 * 初始化移动控制、初始化Battle HUD（仅限本地玩家控制器）
+	 */
 	virtual void BeginPlay() override;
 
 	/** Input mapping context setup */

Source/FirstPersonDemo/Surviver_FPS/UI/BattleHUD.cpp

@@ -0,0 +1,34 @@
+// Copyright Majowaveon Games. All Rights Reserved.
+
+#include "BattleHUD.h"
+#include "Components/ProgressBar.h"
+#include "Components/TextBlock.h"
+#include "Kismet/GameplayStatics.h"
+#include "FirstPersonDemo/Surviver_FPS/Battle/HealthComponent.h"
+
+void UBattleHUD::UpdateHealth(float CurrentHealth, float MaxHealth) {
+	if (HealthBar) {
+		HealthBar->SetPercent(CurrentHealth / MaxHealth);
+	}
+
+	if (HealthText) {
+		HealthText->SetText(FText::FromString(FString::Printf(TEXT("%.0f / %.0f"), CurrentHealth, MaxHealth)));
+	}
+}
+
+void UBattleHUD::NativeConstruct() {
+	Super::NativeConstruct();
+
+	// 获取玩家Pawn
+	APawn* PlayerPawn = UGameplayStatics::GetPlayerPawn(this, 0);
+	if (PlayerPawn) {
+		// 获取生命值组件
+		UHealthComponent* HealthComponent = PlayerPawn->FindComponentByClass<UHealthComponent>();
+		if (HealthComponent) {
+			// 绑定生命值变化事件
+			HealthComponent->OnHealthChanged.AddDynamic(this, &UBattleHUD::UpdateHealth);
+			// 初始化血量显示
+			UpdateHealth(HealthComponent->GetCurrentHealth(), HealthComponent->GetMaxHealth());
+		}
+	}
+}

Source/FirstPersonDemo/Surviver_FPS/UI/BattleHUD.h

@@ -0,0 +1,36 @@
+// Copyright Majowaveon Games. All Rights Reserved.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Blueprint/UserWidget.h"
+#include "BattleHUD.generated.h"
+
+class UProgressBar;
+class UTextBlock;
+
+/**
+ * @brief 战斗界面的 HUD，显示当前血量
+ * @ingroup UI
+ */
+UCLASS()
+class FIRSTPERSONDEMO_API UBattleHUD : public UUserWidget {
+	GENERATED_BODY()
+
+public:
+	UFUNCTION(BlueprintCallable, Category = "HUD")
+	void UpdateHealth(float CurrentHealth, float MaxHealth);
+
+protected:
+	/** @brief 绑定生命显示逻辑
+	 * 获取 @ref UHealthComponent，绑定生命值变化 @ref OnHealthChanged 事件到 @ref UpdateHealth 函数
+	 */
+	virtual void NativeConstruct() override;
+
+	// 通过 meta = (BindWidget) 将此变量绑定到蓝图中的同名控件
+	UPROPERTY(meta = (BindWidget))
+	UProgressBar* HealthBar;
+
+	UPROPERTY(meta = (BindWidget))
+	UTextBlock* HealthText;
+};