DragDropOperation.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "UObject/Object.h"
#include "UObject/ScriptMacros.h"
#include "Input/Events.h"
#include "Widgets/Views/STableRow.h"
#include "DragDropOperation.generated.h"
 
class UDragDropOperation;
 
 
UENUM(BlueprintType)
enum class EUMGItemDropZone : uint8
{
    AboveItem,
    OntoItem,
    BelowItem,
    None
};
 
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnDragDropMulticast, UDragDropOperation*, Operation);
 
UENUM(BlueprintType)
enum class EDragPivot : uint8
{
    MouseDown,
    TopLeft,
    TopCenter,
    TopRight,
    CenterLeft,
    CenterCenter,
    CenterRight,
    BottomLeft,
    BottomCenter,
    BottomRight
};
 
UCLASS(BlueprintType, Blueprintable, meta=( DontUseGenericSpawnObject="True" ), MinimalAPI)
class UDragDropOperation : public UObject
{
    GENERATED_UCLASS_BODY()
    
public:
 
    static EUMGItemDropZone ConvertSlateDropZoneToUMG(TOptional<EItemDropZone> DropZone);
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Drag and Drop", meta=( ExposeOnSpawn="true" ))
    FString Tag;
    
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Drag and Drop", meta=( ExposeOnSpawn="true" ))
    TObjectPtr<UObject> Payload;
    
    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Drag and Drop", meta=( ExposeOnSpawn="true", DisplayName="Drag Visual" ))
    TObjectPtr<class UWidget> DefaultDragVisual;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Drag and Drop", meta=( ExposeOnSpawn="true" ))
    EDragPivot Pivot;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Drag and Drop", AdvancedDisplay, meta=( ExposeOnSpawn="true" ))
    FVector2D Offset;
 
    UPROPERTY(BlueprintAssignable)
    FOnDragDropMulticast OnDrop;
 
    UPROPERTY(BlueprintAssignable)
    FOnDragDropMulticast OnDragCancelled;
 
    UPROPERTY(BlueprintAssignable)
    FOnDragDropMulticast OnDragged;
 
    UFUNCTION(BlueprintNativeEvent, Category="Drag and Drop")
    UMG_API void Drop(const FPointerEvent& PointerEvent);
 
    UFUNCTION(BlueprintNativeEvent, Category="Drag and Drop")
    UMG_API void DragCancelled(const FPointerEvent& PointerEvent);
 
    UFUNCTION(BlueprintNativeEvent, Category="Drag and Drop")
    UMG_API void Dragged(const FPointerEvent& PointerEvent);
};