GestureDetector.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "Containers/BitArray.h"
#include "GenericPlatform/GenericApplicationMessageHandler.h"
#include "HAL/Platform.h"
#include "InputCoreTypes.h"
#include "Math/Vector2D.h"
#include "Misc/Optional.h"
 
class FDefaultBitArrayAllocator;
 
class FGestureDetector
{
public:
    static double LongPressSeconds;
 
    static float LongPressAllowedMovement;
 
public:
    static bool IsGestureSupported(EGestureEvent Gesture);
 
    void OnTouchStarted(int32 TouchIndex, const FVector2D& Location);
    void OnTouchEnded(int32 TouchIndex, const FVector2D& Location);
    void OnTouchMoved(int32 TouchIndex, const FVector2D& Location);
 
    void GenerateGestures(FGenericApplicationMessageHandler& MessageHandler, const TBitArray<FDefaultBitArrayAllocator>& EnabledGestures);
 
private:
    struct FLongPressData
    {
        TOptional<double> Time;
        FVector2D Location;
 
        FLongPressData()
            : Time()
            , Location(0, 0)
        {
        }
 
        void Reset()
        {
            Time.Reset();
            Location = FVector2D(0, 0);
        }
    };
 
    FLongPressData LongPressTrack[EKeys::NUM_TOUCH_KEYS];
};