GestureBase.h

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// Copyright 2024 Lost in Game Studio. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/Object.h"
#include "GestureBase.generated.h"
 
USTRUCT(BlueprintType)
struct FGestureData
{
    GENERATED_BODY()
    
    uint32 PointerIndex;
    
    uint8 bIsActive:1;
    
    float PressDuration;
    double TouchStartTime;
    double TouchEndTime;
    double AccumulatedTime;
    
    FVector2D BeginPosition;
    FVector2D CurrentPosition;
    FVector2D LastPosition;
    FVector2D OffsetFromBegin;
 
    bool AcceptPointerIndex(const uint32 InPointerIndex) const
    {
        return PointerIndex == InPointerIndex;
    }
 
    FGestureData()
    : PointerIndex(-1)
    , bIsActive(false)
    , PressDuration(0.0f)
    , TouchStartTime(0.0f)
    , TouchEndTime(0.0f)
    , AccumulatedTime(0.0f)
    , BeginPosition(ForceInitToZero)
    , LastPosition(ForceInitToZero)
    , OffsetFromBegin(ForceInitToZero)
    , bDetected(false)
    , bFirstTouchDetected(false)
    , bLongPressDetected(false)
    , bDragDetected(false)
    , bBlockDrag(false)
    {
        FMemory::Memzero(this, sizeof(*this));
    }
 
    FGestureData(const int32 PointerIndex, const FVector2D Location)
    : PointerIndex(PointerIndex)
    , bIsActive(true)
    , PressDuration(0.0f)
    , TouchStartTime(0.0f)
    , TouchEndTime(0.0f)
    , AccumulatedTime(0.0f)
    , BeginPosition(Location)
    , LastPosition(Location)
    , OffsetFromBegin(ForceInitToZero)
    , bDetected(false)
    , bFirstTouchDetected(true)
    , bLongPressDetected(false)
    , bDragDetected(false)
    , bBlockDrag(false)
    {
        
    }
 
    FGestureData(const int32 PointerIndex, const FVector2D Location, const double Time)
    : PointerIndex(PointerIndex)
    , bIsActive(true)
    , PressDuration(0.0f)
    , TouchStartTime(Time)
    , TouchEndTime(Time)
    , AccumulatedTime(0.0f)
    , BeginPosition(Location)
    , LastPosition(Location)
    , OffsetFromBegin(ForceInitToZero)
    , bDetected(false)
    , bFirstTouchDetected(true)
    , bLongPressDetected(false)
    , bDragDetected(false)
    , bBlockDrag(false)
    {
        
    }
 
    void Update(const FVector2D Location)
    {
        OffsetFromBegin = Location - BeginPosition;
        CurrentPosition = Location;
    }
 
    void End(const FVector2D Location)
    {
        LastPosition = Location;
        bIsActive = false;
        TouchEndTime = TouchStartTime + AccumulatedTime;
    }
    
private:
    friend class UGestureBase;
    friend class UMultitouchLogic;
    
    uint8 bDetected:1;
    uint8 bFirstTouchDetected:1;
    uint8 bLongPressDetected:1;
    uint8 bDragDetected:1;
    uint8 bBlockDrag:1;
    
    void Reset()
    {
        PointerIndex = -1;
        PressDuration = 0.0f;
        TouchStartTime = 0.0f;
        AccumulatedTime = 0.0f;
        BeginPosition = FVector2D::ZeroVector;
        LastPosition = FVector2D::ZeroVector;
        OffsetFromBegin = FVector2D::ZeroVector;
        bDetected = false;
        bFirstTouchDetected = false;
        bLongPressDetected = false;
        bDragDetected = false;
        bIsActive = false;
    }
};
 
UCLASS(Abstract, EditInlineNew)
class TOUCHINTERFACE_API UGestureBase : public UObject
{
    GENERATED_BODY()
 
public:
    UGestureBase();
 
    //TODO: Block other gesture if needed
    // Make function ShouldBlock()
 
    UFUNCTION(Category="Gesture", BlueprintNativeEvent)
    void Initialization();
 
    UFUNCTION(Category="Gesture", BlueprintNativeEvent)
    void OnGestureStarted(const TArray<FGestureData>& GestureData);
 
    UFUNCTION(Category="Gesture", BlueprintNativeEvent)
    void OnGestureUpdated(const TArray<FGestureData>& GestureData);
 
    UFUNCTION(Category="Gesture", BlueprintNativeEvent)
    void OnGestureEnded(const TArray<FGestureData>& GestureData);
};