UE4 摇杆JoyStick-Touch Interface Setup

1.创建

2、属性

USTRUCT()
struct FTouchInputControl
{
	GENERATED_USTRUCT_BODY()

    //自由活动图片
	// basically mirroring SVirtualJoystick::FControlInfo but as an editable class
	UPROPERTY(EditAnywhere, Category="Control", meta=(ToolTip="For sticks, this is the Thumb"))
	UTexture2D* Image1;
    
    //底图
	UPROPERTY(EditAnywhere, Category="Control", meta=(ToolTip="For sticks, this is the Background"))
	UTexture2D* Image2;

    //中心位置
	UPROPERTY(EditAnywhere, Category="Control", meta=(ToolTip="The center point of the control (if <= 1.0, it's relative to screen, > 1.0 is absolute)"))
	FVector2D Center;

    //可见范围
	UPROPERTY(EditAnywhere, Category="Control", meta=(ToolTip="The size of the control (if <= 1.0, it's relative to screen, > 1.0 is absolute)"))
	FVector2D VisualSize;

    //自由活动图片的尺寸
	UPROPERTY(EditAnywhere, Category="Control", meta=(ToolTip="For sticks, the size of the thumb (if <= 1.0, it's relative to screen, > 1.0 is absolute)"))
	FVector2D ThumbSize;

    //触摸响应范围
	UPROPERTY(EditAnywhere, Category="Control", meta=(ToolTip="The interactive size of the control (if <= 1.0, it's relative to screen, > 1.0 is absolute)"))
	FVector2D InteractionSize;

    //输入力度/强度
	UPROPERTY(EditAnywhere, Category = "Control", meta = (ToolTip = "The scale for control input"))
	FVector2D InputScale;

    //按键：触发与ProjectSetting中对应按键相同的输入事件
	UPROPERTY(EditAnywhere, Category="Control", meta=(ToolTip="The main input to send from this control (for sticks, this is the horizontal axis)"))
	FKey MainInputKey;

    //按键：触发与ProjectSetting中对应ALT+按键相同的输入事件
	UPROPERTY(EditAnywhere, Category="Control", meta=(ToolTip="The alternate input to send from this control (for sticks, this is the vertical axis)"))
	FKey AltInputKey;

	FTouchInputControl()
		: Image1(nullptr)
		, Image2(nullptr)
		, Center(ForceInitToZero)
		, VisualSize(ForceInitToZero)
		, ThumbSize(ForceInitToZero)
		, InteractionSize(ForceInitToZero)
		, InputScale(1.f, 1.f)
	{
	}
};

UCLASS(Blueprintable, BlueprintType)
class ENGINE_API UTouchInterface : public UObject
{
	GENERATED_UCLASS_BODY()

    //控制的元素列表
	UPROPERTY(EditAnywhere, Category="TouchInterface")
	TArray<FTouchInputControl> Controls;

    //激活状态的透明度
	UPROPERTY(EditAnywhere, Category="TouchInterface", meta=(ToolTip="Opacity (0.0 - 1.0) of all controls while any control is active"))
	float ActiveOpacity;

    //非激活状态的透明度
	UPROPERTY(EditAnywhere, Category="TouchInterface", meta=(ToolTip="Opacity (0.0 - 1.0) of all controls while no controls are active"))
	float InactiveOpacity;

    //进去非激活状态的时间，一旦没有输入就开始计时
	UPROPERTY(EditAnywhere, Category="TouchInterface", meta=(ToolTip="How long after user interaction will all controls fade out to Inactive Opacity"))
	float TimeUntilDeactive;

    //复位的时间
	UPROPERTY(EditAnywhere, Category="TouchInterface", meta=(ToolTip="How long after going inactive will controls reset/recenter themselves (0.0 will disable this feature)"))
	float TimeUntilReset;

    //延迟激活
	UPROPERTY(EditAnywhere, Category="TouchInterface", meta=(ToolTip="How long after joystick enabled for touch (0.0 will disable this feature)"))
	float ActivationDelay;

    //不准复位
	UPROPERTY(EditAnywhere, Category="TouchInterface", meta=(ToolTip="Whether to prevent joystick re-center"))
	bool bPreventRecenter;

    //
	UPROPERTY(EditAnywhere, Category = "TouchInterface", meta = (ToolTip = "Delay at startup before virtual joystick is drawn"))
	float StartupDelay;

    //与JoyStick耦合的接口
	/** Make this the active set of touch controls */
	void Activate(TSharedPtr<SVirtualJoystick> VirtualJoystick);
};