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     行走控制元件的渲染實現之後，下一步為其新增Pressed事件響應，具體可以參考UButton裡的實現

     Pressed的時候，將WalkWidget的方位資訊傳遞給CharacterPanda

     實現功能的過程發現，UE4的藍圖系統還是非常靈活高效的，非常推薦深入學習UE4 (^_^)

     為自定義的UWalkWidget新增OnPressed事件

       分兩部分

       UWalkWidget類中

DECLARE_DYNAMIC_MULTICAST_DELEGATE(FOnWalkWidgetPressedEvent);

class MOBAHERO_API UWalkWidget : public UWidget
{
public:
	/** Called when the button is pressed */
	UPROPERTY(BlueprintAssignable, Category = "WalkWidget|Event")
	FOnWalkWidgetPressedEvent OnPressed;

protected:
	void SlateHandlePressed();
};

TSharedRef<SWidget> UWalkWidget::RebuildWidget()
{
	MyWalkWidget = SNew(SWalkWidget)
		.OnPressed(BIND_UOBJECT_DELEGATE(FSimpleDelegate, SlateHandlePressed));

	return MyWalkWidget.ToSharedRef();
}

void UWalkWidget::SlateHandlePressed()
{
	OnPressed.Broadcast();
}
 

      SWalkWidget類中

       需要在OnTouchStarted裡呼叫Press，才能通過藍圖進行事件的控制

class MOBAHERO_API SWalkWidget : public SLeafWidget
{
public:
	SLATE_BEGIN_ARGS(SWalkWidget)
	{}
	/** Called when the button is pressed */
		SLATE_EVENT(FSimpleDelegate, OnPressed)

	SLATE_END_ARGS()

	void Construct(const FArguments& InArgs);
	
        virtual FReply OnTouchStarted(const FGeometry& MyGeometry, const FPointerEvent& Event) override;

private:	
	bool bPressed;

	/** Press the widget */
	virtual void Press();

	/** The delegate to execute when the button is pressed */
	FSimpleDelegate OnPressed;
};


void SWalkWidget::Construct(const FArguments& InArgs)
{
	//
	bPressed = false;

	OnPressed = InArgs._OnPressed;
}

FReply SWalkWidget::OnTouchStarted(const FGeometry& MyGeometry, const FPointerEvent& Event)
{

	FVector2D LocalCoord = MyGeometry.AbsoluteToLocal(Event.GetScreenSpacePosition());

	Control.ThumbPosition = LocalCoord - Control.VisualCenter;

	Press();

	return FReply::Handled();
}

void SWalkWidget::Press()
{
	if (!bPressed)
	{
		bPressed = true;

		//PlayPressedSound();

		OnPressed.ExecuteIfBound();
	}
}
 

                  Slate藍圖 成功時右側會在【事件】下面顯示OnPressed

                      編輯事件，並傳遞資訊給CharacterPanda

                   在Level藍圖設定Player Controller的Owner，然後傳遞給Slate藍圖

                       
        最後在CharacterPanda裡只需SetDirection即可進行方向控制

void ACharacterPanda::SetDirection(const FVector2D& Dir)
{
	GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Yellow, FString::Printf(TEXT("當前方向 X:%.3f,Y:%.3f"), Dir.X, Dir.Y));
	//
	VelocityDirection = FVector(-Dir.Y,Dir.X,0.f);
	FQuat Rot;
	Rot = FQuat::FindBetweenVectors(FVector(0.f,1.f,0.f), VelocityDirection);

	this->SetActorRotation(Rot);

	CurrentState = CharacterState::Walk;
}