U++ 鼠标按键映射及绑定

传统输入系统更方便修改按键如果想把鼠标左键触发改为空格键触发只需要在引擎中修改无需修改C.传统输入系统中的两种映射操作映射Action Mapping轴映射Axis Mapping操作映射关心有没有发生而不是发生了多少适合处理按了一次的输入如鼠标左键按下鼠标右键按下滚轮向上滚动一次滚轮向下滚动一次操作映射可检测IE_Pressed // 按下时执行IE_Released // 松开时执行IE_Repeat // 按住时重复执行IE_DoubleClick // 双击时执行操作映射可以给同一个Action添加多个按键这些按键触发相同功能。轴映射适合产生数值的输入它关心的是输入值是多少通常带有一个float参数如鼠标水平移动鼠标垂直移动鼠标滚轮轴轴映射中非常重要的一个参数是Scale它表示输入值乘以多少。UE 的输入设置中Action Mapping 用于按下和松开事件Axis Mapping 用于连续范围输入。对于鼠标滚轮UE同时提供EKeys::MouseScrollUpEKeys::MouseScrollDownEKeys::MouseWheelAxis滚轮既可以作两个离散按键也可以作一个带有正负值的轴。在项目设置中创建鼠标映射编辑 Edit→ 项目设置 Project Settings→ 引擎 Engine→ 输入 Input→ 绑定 Bindings映射名称可以自己设置但必须和 C 中的名称完全一致包括大小写。案例如下// Fill out your copyright notice in the Description page of Project Settings. #include MouseCpp.h #include Components/InputComponent.h #include Engine/Engine.h #include GameFramework/PlayerController.h #include Components/SceneComponent.h #include Components/StaticMeshComponent.h // Sets default values AMouseCpp::AMouseCpp() { // Set this actor to call Tick() every frame. You can turn this off to improve performance if you dont need it. PrimaryActorTick.bCanEverTick true; MySceneCreateDefaultSubobjectUSceneComponent( TEXT(MyScene) ); SetRootComponent(MyScene); MyStaticMeshCreateDefaultSubobjectUStaticMeshComponent( TEXT(MyStaticMeshComponent) ); MyStaticMesh-SetupAttachment(MyScene); } // Called when the game starts or when spawned void AMouseCpp::BeginPlay() { Super::BeginPlay(); // 获取第一个本地玩家的 PlayerController APlayerController* PlayerController GetWorld()-GetFirstPlayerController(); if (!PlayerController) { return; } // 让当前 Actor 可以接收这个玩家的输入 EnableInput(PlayerController); // EnableInput 后Actor 会拥有用于绑定输入的 InputComponent if (!InputComponent) { return; } InputComponent-BindAction( TEXT(MouseLeft), IE_Pressed, this, AMouseCpp::OnLeftMousePressed ); InputComponent-BindAction( TEXT(MouseLeft), IE_Released, this, AMouseCpp::OnLeftMouseReleased ); InputComponent-BindAction( TEXT(MouseRight), IE_Pressed, this, AMouseCpp::OnRightMousePressed ); InputComponent-BindAction( TEXT(MouseMiddle), IE_Pressed, this, AMouseCpp::OnMiddleMousePressed ); InputComponent-BindAction( TEXT(MouseWheelUP), IE_Pressed, this, AMouseCpp::OnMouseWheelUp ); InputComponent-BindAction( TEXT(MouseWheelDown), IE_Pressed, this, AMouseCpp::OnMouseWheelDown ); InputComponent-BindAxis( TEXT(MouseWheel), this, AMouseCpp::OnMouseWheelAxis ); PlayerController-bShowMouseCursor true; } // Called every frame void AMouseCpp::Tick(float DeltaTime) { Super::Tick(DeltaTime); } void AMouseCpp::OnLeftMousePressed() { if (GEngine) { GEngine-AddOnScreenDebugMessage( -1, 2.0f, FColor::Red, TEXT(鼠标左键按下) ); } } void AMouseCpp::OnLeftMouseReleased() { if (GEngine) { GEngine-AddOnScreenDebugMessage( -1, 2.0f, FColor::Red, TEXT(鼠标左键松开) ); } } void AMouseCpp::OnRightMousePressed() { if (GEngine) { GEngine-AddOnScreenDebugMessage( -1, 2.0f, FColor::Red, TEXT(鼠标右键按下) ); } } void AMouseCpp::OnMiddleMousePressed() { SetActorScale3D(FVector(1.0f)); if (GEngine) { GEngine-AddOnScreenDebugMessage( -1, 2.0f, FColor::Cyan, TEXT(鼠标中键恢复默认缩放) ); } } void AMouseCpp::OnMouseWheelUp() { const FVector NewScale GetActorScale3D() * 1.1f; SetActorScale3D(NewScale); if (GEngine) { GEngine-AddOnScreenDebugMessage( -1, 1.0f, FColor::Green, TEXT(滚轮向上Actor 放大) ); } } void AMouseCpp::OnMouseWheelDown() { // 每次缩小约 10% const FVector NewScale GetActorScale3D() / 1.1f; SetActorScale3D(NewScale); if (GEngine) { GEngine-AddOnScreenDebugMessage( -1, 1.0f, FColor::Red, TEXT(滚轮向下Actor 缩小) ); } } void AMouseCpp::OnMouseWheelAxis(float Value) { if (FMath::IsNearlyZero(Value)) { return; } if (GEngine) { GEngine-AddOnScreenDebugMessage( -1, 1.0f, FColor::White, FString::Printf( TEXT(鼠标滚轮轴值%.2f), Value ) ); } }