Ue4C++编程------UMG与c++（二）

    12：为MainMenuMap创建GameModeBase类和HUD类和playcontroller类。即继承GameModeBase类和HUD类和playcontroller类，playcontroller类是为了将鼠标显示出来，重写HUD类的beginplay函数，并且在begameplay时，创建widget，并addtoviewport，如下图。

    

    13：在MainMenuMap的GamemodeBase类中，设置默认的HUD类成员为12步骤创建的HUD，playcontroller为12创建的类。

    14：设置MainMenuMap的默认gamemodebase及hud。如下图：

    

    15：设置mainmenu的button对应的函数，使之点击按钮实现相应的动作，如点击开始按钮，则进入第三人称模板。如下图：

    

    16：设置默认地图，Edit->ProjectSettings，如下图：

    

到此，设置菜单关卡就已经完成。测试成功如下：

    

    

    下面贴出涉及到的代码。

    MainMenuUserWidget.h

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

#pragma once

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

/**
 * 
 */
UCLASS()
class BLOGPROJECT_API UMainMenuUserWidget : public UUserWidget
{
	GENERATED_BODY()

	UPROPERTY(meta = (BindWidget))
	class UButton* StartGameBtn;

	UPROPERTY(meta = (BindWidget))
	class UButton* SettingBtn;

	UPROPERTY(meta = (BindWidget))
	class UButton* QuitGameBtn;

	virtual bool Initialize() override;

public:

	UFUNCTION()
	void OnClickedStartGame();

	UFUNCTION()
	void OnClickedSetting();

	UFUNCTION()
	void OnClickedQuitGame();
	
};

MainMenuUserWidget.CPP

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

#include "MainMenuUserWidget.h"
#include "Components/Button.h"

bool UMainMenuUserWidget::Initialize()
{
	Super::Initialize();
	if (StartGameBtn != nullptr)
	{
		StartGameBtn->OnClicked.AddDynamic(this, &UMainMenuUserWidget::OnClickedStartGame);
	}
	if (SettingBtn != nullptr)
	{
		SettingBtn->OnClicked.AddDynamic(this, &UMainMenuUserWidget::OnClickedSetting);
	}
	if (QuitGameBtn != nullptr)
	{
		QuitGameBtn->OnClicked.AddDynamic(this, &UMainMenuUserWidget::OnClickedQuitGame);
	}

	return true;
}

void UMainMenuUserWidget::OnClickedStartGame()
{
	FString NewMap = FString::Printf(TEXT("/Game/ThirdPersonCPP/Maps/ThirdPersonExampleMap"));

	GetWorld()->ServerTravel(NewMap);
}

void UMainMenuUserWidget::OnClickedSetting()
{
	UE_LOG(LogTemp, Warning, TEXT("OnClicked Setting"));
}

void UMainMenuUserWidget::OnClickedQuitGame()
{
	APlayerController* PC = GetWorld()->GetFirstPlayerController();
	if (PC != nullptr)
	{
		PC->ConsoleCommand(TEXT("quit"));
	}
}

MainMenuPlayerController.h

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/PlayerController.h"
#include "MainMenuPlayerController.generated.h"

/**
 * 
 */
UCLASS()
class BLOGPROJECT_API AMainMenuPlayerController : public APlayerController
{
	GENERATED_BODY()

	AMainMenuPlayerController();
	
	
};

MainMenuPlayerController.cpp

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

#include "MainMenuPlayerController.h"

AMainMenuPlayerController::AMainMenuPlayerController()
{
	bShowMouseCursor = true;
}

MainMenuHUD.h

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/HUD.h"
#include "MainMenuHUD.generated.h"

/**
 * 
 */
UCLASS()
class BLOGPROJECT_API AMainMenuHUD : public AHUD
{
	GENERATED_UCLASS_BODY()

	virtual void BeginPlay() override;

private:
	TSubclassOf MainMenuWidgetClass;
	
	
};

MainMenuHUD.cpp

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

#include "MainMenuHUD.h"
#include "UObject/ConstructorHelpers.h"
#include "MainMenuUserWidget.h"

AMainMenuHUD::AMainMenuHUD(const FObjectInitializer& Initailizer)
	: Super(Initailizer)
{
	static ConstructorHelpers::FClassFinder MainMenuWidgetBP(TEXT("/Game/ThirdPersonCPP/UI/MainMenu")); // 找到蓝图类
	if (MainMenuWidgetBP.Succeeded())
	{
		MainMenuWidgetClass = MainMenuWidgetBP.Class; // 得到class
	}
}

void AMainMenuHUD::BeginPlay()
{
	if (MainMenuWidgetClass != nullptr)
	{
		UMainMenuUserWidget* Widget = CreateWidget(GetWorld()->GetGameInstance(), MainMenuWidgetClass);
		if (Widget != nullptr)
		{
			Widget->AddToViewport();
		}
	}
}

MainMenuGameModeBase.h

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/GameModeBase.h"
#include "MainMenuGameModeBase.generated.h"

/**
 * 
 */
UCLASS()
class BLOGPROJECT_API AMainMenuGameModeBase : public AGameModeBase
{
	GENERATED_BODY()

	AMainMenuGameModeBase();
	
	
};

MainMenuGameModeBase.cpp

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

#include "MainMenuGameModeBase.h"
#include "MainMenuHUD.h"
#include "MainMenuPlayerController.h"

AMainMenuGameModeBase::AMainMenuGameModeBase()
{
	HUDClass = AMainMenuHUD::StaticClass();
	PlayerControllerClass = AMainMenuPlayerController::StaticClass();
}