47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
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// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "DragAndDrop/DecoratedDragDropOp.h"
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/** Drag payload type - implement derived types using DRAG_DROP_OPERATOR_TYPE */
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class IDragPayload
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{
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protected:
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/** Friendship required so we can access IsOfType without exposing it */
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friend class FMultipleDataDragOp;
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/** Check if this payload type is the same as the specified type ID */
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virtual bool IsOfTypeImpl(const FString& Type) const { return false; }
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};
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/** A drag/drop operation that contains multiple types of dragged data (payloads) */
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class FMultipleDataDragOp: public FDecoratedDragDropOp
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{
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public:
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DRAG_DROP_OPERATOR_TYPE(FMultipleDataDragOp, FDecoratedDragDropOp)
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/** Add some more data to this operation's payload */
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void AddPayload(TUniquePtr<IDragPayload> InPayload)
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{
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Payload.Add(MoveTemp(InPayload));
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}
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/** Extract the specified data type from this operation */
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virtual const void* Extract(const FString& Type) const
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{
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for (const auto& Entry: Payload)
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{
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if (Entry->IsOfTypeImpl(T::GetTypeId()))
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{
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return Entry.Get();
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}
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}
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return FDecoratedDragDropOp::Extract(Type);
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}
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protected:
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/** The data that we're dragging */
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TArray<TUniquePtr<IDragPayload>> Payload;
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};
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