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116 lines
2.9 KiB
C++
116 lines
2.9 KiB
C++
// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.
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#include "EditorWidgetsPrivatePCH.h"
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#include "SAssetDropTarget.h"
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#include "AssetDragDropOp.h"
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#include "ActorDragDropOp.h"
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#include "AssetSelection.h"
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#include "SScaleBox.h"
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#define LOCTEXT_NAMESPACE "EditorWidgets"
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void SAssetDropTarget::Construct(const FArguments& InArgs )
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{
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OnAssetDropped = InArgs._OnAssetDropped;
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OnIsAssetAcceptableForDrop = InArgs._OnIsAssetAcceptableForDrop;
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SDropTarget::Construct(
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SDropTarget::FArguments()
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.OnDrop(this, &SAssetDropTarget::OnDropped)
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[
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InArgs._Content.Widget
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]);
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}
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FReply SAssetDropTarget::OnDropped(TSharedPtr<FDragDropOperation> DragDropOperation)
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{
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bool bUnused;
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UObject* Object = GetDroppedObject(DragDropOperation, bUnused);
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if ( Object )
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{
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OnAssetDropped.ExecuteIfBound(Object);
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}
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return FReply::Handled();
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}
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bool SAssetDropTarget::OnAllowDrop(TSharedPtr<FDragDropOperation> DragDropOperation) const
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{
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bool bUnused = false;
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UObject* Object = GetDroppedObject(DragDropOperation, bUnused);
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if ( Object )
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{
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// Check and see if its valid to drop this object
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if ( OnIsAssetAcceptableForDrop.IsBound() )
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{
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return OnIsAssetAcceptableForDrop.Execute(Object);
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}
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else
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{
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// If no delegate is bound assume its always valid to drop this object
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return true;
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}
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}
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return false;
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}
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bool SAssetDropTarget::OnIsRecognized(TSharedPtr<FDragDropOperation> DragDropOperation) const
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{
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bool bRecognizedEvent = false;
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UObject* Object = GetDroppedObject(DragDropOperation, bRecognizedEvent);
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return bRecognizedEvent;
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}
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UObject* SAssetDropTarget::GetDroppedObject(TSharedPtr<FDragDropOperation> DragDropOperation, bool& bOutRecognizedEvent) const
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{
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bOutRecognizedEvent = false;
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UObject* DroppedObject = NULL;
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// Asset being dragged from content browser
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if ( DragDropOperation->IsOfType<FAssetDragDropOp>() )
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{
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bOutRecognizedEvent = true;
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TSharedPtr<FAssetDragDropOp> DragDropOp = StaticCastSharedPtr<FAssetDragDropOp>(DragDropOperation);
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bool bCanDrop = DragDropOp->AssetData.Num() == 1;
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if( bCanDrop )
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{
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const FAssetData& AssetData = DragDropOp->AssetData[0];
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// Make sure the asset is loaded
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DroppedObject = AssetData.GetAsset();
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}
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}
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// Asset being dragged from some external source
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else if ( DragDropOperation->IsOfType<FExternalDragOperation>() )
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{
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TArray<FAssetData> DroppedAssetData = AssetUtil::ExtractAssetDataFromDrag(DragDropOperation);
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if (DroppedAssetData.Num() == 1)
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{
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bOutRecognizedEvent = true;
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DroppedObject = DroppedAssetData[0].GetAsset();
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}
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}
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// Actor being dragged?
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else if ( DragDropOperation->IsOfType<FActorDragDropOp>() )
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{
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bOutRecognizedEvent = true;
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TSharedPtr<FActorDragDropOp> ActorDragDrop = StaticCastSharedPtr<FActorDragDropOp>(DragDropOperation);
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if (ActorDragDrop->Actors.Num() == 1)
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{
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DroppedObject = ActorDragDrop->Actors[0].Get();
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}
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}
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return DroppedObject;
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}
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#undef LOCTEXT_NAMESPACE
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