UnrealEngineUWP/Engine/Source/Editor/ContentBrowser/Private/SAssetDialog.cpp

// Copyright Epic Games, Inc. All Rights Reserved.

#include "SAssetDialog.h"
#include "Misc/MessageDialog.h"
#include "Widgets/SBoxPanel.h"
#include "Layout/WidgetPath.h"
#include "SlateOptMacros.h"
#include "Framework/Application/SlateApplication.h"
#include "Widgets/Layout/SBorder.h"
#include "Widgets/Text/STextBlock.h"
#include "Widgets/Layout/SBox.h"
#include "Widgets/Input/SEditableTextBox.h"
#include "Widgets/Input/SButton.h"
#include "Widgets/Layout/SSplitter.h"
#include "Styling/AppStyle.h"
#include "Styling/AppStyle.h"
#include "AssetRegistry/AssetRegistryModule.h"
#include "ContentBrowserSingleton.h"
#include "ContentBrowserUtils.h"

#include "Framework/MultiBox/MultiBoxBuilder.h"
#include "ContentBrowserCommands.h"
#include "Framework/Commands/GenericCommands.h"
#include "SPathPicker.h"
#include "SAssetPicker.h"
#include "AssetViewTypes.h"
#include "ObjectTools.h"

#include "SPathView.h"
#include "SAssetView.h"
#include "Widgets/Notifications/SNotificationList.h"
#include "Framework/Notifications/NotificationManager.h"
#include "Editor/EditorEngine.h"
#include "HAL/FileManager.h"
#include "CoreMinimal.h"
#include "SourceCodeNavigation.h"
#include "Editor.h"

#include "IContentBrowserDataModule.h"
#include "ContentBrowserDataSource.h"
#include "ContentBrowserDataSubsystem.h"
#include "SPrimaryButton.h"

#define LOCTEXT_NAMESPACE "ContentBrowser"

SAssetDialog::SAssetDialog()
	: DialogType(EAssetDialogType::Open)
	, ExistingAssetPolicy(ESaveAssetDialogExistingAssetPolicy::Disallow)
	, bLastInputValidityCheckSuccessful(false)
	, bPendingFocusNextFrame(true)
	, bValidAssetsChosen(false)
	, OpenedContextMenuWidget(EOpenedContextMenuWidget::None)
{
}

SAssetDialog::~SAssetDialog()
{
	if (!bValidAssetsChosen)
	{
		OnAssetDialogCancelled.ExecuteIfBound();
	}
}

BEGIN_SLATE_FUNCTION_BUILD_OPTIMIZATION
void SAssetDialog::Construct(const FArguments& InArgs, const FSharedAssetDialogConfig& InConfig)
{
	DialogType = InConfig.GetDialogType();

	AssetClassNames = InConfig.AssetClassNames;

	const FString DefaultPath = InConfig.DefaultPath;

	RegisterActiveTimer( 0.f, FWidgetActiveTimerDelegate::CreateSP( this, &SAssetDialog::SetFocusPostConstruct ) );

	FPathPickerConfig PathPickerConfig;
	PathPickerConfig.DefaultPath = DefaultPath;
	PathPickerConfig.bFocusSearchBoxWhenOpened = false;
	PathPickerConfig.OnPathSelected = FOnPathSelected::CreateSP(this, &SAssetDialog::HandlePathSelected);
	PathPickerConfig.SetPathsDelegates.Add(&SetPathsDelegate);
	PathPickerConfig.OnGetFolderContextMenu = FOnGetFolderContextMenu::CreateSP(this, &SAssetDialog::OnGetFolderContextMenu);	
	PathPickerConfig.bOnPathSelectedPassesVirtualPaths = true;

	FAssetPickerConfig AssetPickerConfig;
	AssetPickerConfig.Filter.ClassPaths.Append(AssetClassNames);
	AssetPickerConfig.bAllowDragging = false;
	AssetPickerConfig.InitialAssetViewType = EAssetViewType::Tile;
	AssetPickerConfig.OnAssetSelected = FOnAssetSelected::CreateSP(this, &SAssetDialog::OnAssetSelected);
	AssetPickerConfig.OnAssetsActivated = FOnAssetsActivated::CreateSP(this, &SAssetDialog::OnAssetsActivated);
	AssetPickerConfig.SetFilterDelegates.Add(&SetFilterDelegate);
	AssetPickerConfig.GetCurrentSelectionDelegates.Add(&GetCurrentSelectionDelegate);
	AssetPickerConfig.SaveSettingsName = TEXT("AssetDialog");
	AssetPickerConfig.bCanShowFolders = true;
	AssetPickerConfig.bCanShowDevelopersFolder = true;
	AssetPickerConfig.OnFolderEntered = FOnPathSelected::CreateSP(this, &SAssetDialog::HandleAssetViewFolderEntered);
	AssetPickerConfig.OnGetAssetContextMenu = FOnGetAssetContextMenu::CreateSP(this, &SAssetDialog::OnGetAssetContextMenu);
	AssetPickerConfig.OnGetFolderContextMenu = FOnGetFolderContextMenu::CreateSP(this, &SAssetDialog::OnGetFolderContextMenu);

	OnPathSelected = InConfig.OnPathSelected;

	SetCurrentlySelectedPath(DefaultPath, EContentBrowserPathType::Internal);

	// Open and save specific configuration
	FText ConfirmButtonText;
	bool bIncludeNameBox = false;
	switch (DialogType)
	{
	case EAssetDialogType::Open:
	{
		const FOpenAssetDialogConfig& OpenAssetConfig = static_cast<const FOpenAssetDialogConfig&>(InConfig);
		PathPickerConfig.bAllowContextMenu = true;
		ConfirmButtonText = LOCTEXT("AssetDialogOpenButton", "Open");
		AssetPickerConfig.SelectionMode = OpenAssetConfig.bAllowMultipleSelection ? ESelectionMode::Multi : ESelectionMode::Single;
		AssetPickerConfig.bFocusSearchBoxWhenOpened = true;
		bIncludeNameBox = false;
		break;
	}

	case EAssetDialogType::Save:
	{
		const FSaveAssetDialogConfig& SaveAssetConfig = static_cast<const FSaveAssetDialogConfig&>(InConfig);
		PathPickerConfig.bAllowContextMenu = true;
		PathPickerConfig.bAllowReadOnlyFolders = false;
		ConfirmButtonText = LOCTEXT("AssetDialogSaveButton", "Save");
		AssetPickerConfig.SelectionMode = ESelectionMode::Single;
		AssetPickerConfig.bFocusSearchBoxWhenOpened = false;
		AssetPickerConfig.bCanShowReadOnlyFolders = false;
		bIncludeNameBox = true;
		ExistingAssetPolicy = SaveAssetConfig.ExistingAssetPolicy;
		SetCurrentlyEnteredAssetName(SaveAssetConfig.DefaultAssetName);
		break;
	}

	default:
		ensureMsgf(0, TEXT("AssetDialog type %d is not supported."), DialogType);
		break;
	}

	PathPicker = StaticCastSharedRef<SPathPicker>(FContentBrowserSingleton::Get().CreatePathPicker(PathPickerConfig));

	TArray<FString> SelectedVirtualPaths = PathPicker->GetPaths();
	if (SelectedVirtualPaths.Num() == 0)
	{
		// No paths selected, choose PathView's default selection
		const TSharedPtr<SPathView>& PathView = PathPicker->GetPathView();
		const TArray<FName> DefaultPathsToSelect = PathView->GetDefaultPathsToSelect();
		if (DefaultPathsToSelect.Num() > 0)
		{
			// Try select path
			PathPicker->SetPaths({ DefaultPathsToSelect[0].ToString() });

			// Get paths that were successfully selected
			SelectedVirtualPaths = PathPicker->GetPaths();
		}

		if (SelectedVirtualPaths.Num() == 0)
		{
			// No paths selected, choose selection based on first root folder displayed in PathView
			const TArray<FName> RootPathItemNames = PathView->GetRootPathItemNames();
			if (RootPathItemNames.Num() > 0)
			{
				// Try select path
				PathPicker->SetPaths({ FString(TEXT("/")) + RootPathItemNames[0].ToString() });

				// Get paths that were successfully selected
				SelectedVirtualPaths = PathPicker->GetPaths();
			}
		}
	}

	// Update AssetPickerConfig's selection to match PathPicker
	if (SelectedVirtualPaths.Num() > 0)
	{
		AssetPickerConfig.Filter.PackagePaths = { FName(*SelectedVirtualPaths[0]) };
	}

	AssetPicker = StaticCastSharedRef<SAssetPicker>(FContentBrowserSingleton::Get().CreateAssetPicker(AssetPickerConfig));

	// Update AssetDialog's path to match PathPicker
	if (SelectedVirtualPaths.Num() > 0)
	{
		const FName DefaultVirtualPath = IContentBrowserDataModule::Get().GetSubsystem()->ConvertInternalPathToVirtual(*DefaultPath);
		if (DefaultVirtualPath != *SelectedVirtualPaths[0])
		{
			SetCurrentlySelectedPath(SelectedVirtualPaths[0], EContentBrowserPathType::Virtual);
		}
	}

	FContentBrowserCommands::Register();
	BindCommands();

	// The root widget in this dialog.
	TSharedRef<SVerticalBox> MainVerticalBox = SNew(SVerticalBox);

	// Path/Asset view
	MainVerticalBox->AddSlot()
		.FillHeight(1)
		.Padding(0, 0, 0, 4)
		[
			SNew(SSplitter)
		
			+SSplitter::Slot()
			.Value(0.25f)
			[
				SNew(SBorder)
				.BorderImage(FAppStyle::GetBrush("ToolPanel.GroupBorder"))
				[
					PathPicker.ToSharedRef()
				]
			]

			+SSplitter::Slot()
			.Value(0.75f)
			[
				SNew(SBorder)
				.BorderImage(FAppStyle::GetBrush("ToolPanel.GroupBorder"))
				[
					AssetPicker.ToSharedRef()
				]
			]
		];

	// Input error strip, if we are using a name box
	if (bIncludeNameBox)
	{
		// Name Error label
		MainVerticalBox->AddSlot()
		.AutoHeight()
		[
			// Constant height, whether the label is visible or not
			SNew(SBox).HeightOverride(18)
			[
				SNew(SBorder)
				.Visibility( this, &SAssetDialog::GetNameErrorLabelVisibility )
				.BorderImage( FAppStyle::GetBrush("AssetDialog.ErrorLabelBorder") )
				.Content()
				[
					SNew(STextBlock)
					.Text( this, &SAssetDialog::GetNameErrorLabelText )
					.ToolTipText(this, &SAssetDialog::GetNameErrorLabelText)
				]
			]
		];
	}

	TSharedRef<SVerticalBox> LabelsBox = SNew(SVerticalBox)
		+ SVerticalBox::Slot()
		.FillHeight(1)
		.VAlign(VAlign_Center)
		.Padding(0, 4, 0, 4)
		[
			SNew(STextBlock).Text(LOCTEXT("PathBoxLabel", "Path:"))
		];

	TSharedRef<SVerticalBox> ContentBox = SNew(SVerticalBox)
		+ SVerticalBox::Slot()
		.FillHeight(1)
		.VAlign(VAlign_Center)
		.Padding(0, 4, 0, 4)
		[
			SAssignNew(PathText, STextBlock)
			.Text(this, &SAssetDialog::GetPathNameText)
		];

	if (bIncludeNameBox)
	{
		LabelsBox->AddSlot()
			.FillHeight(1)
			.VAlign(VAlign_Center)
			.Padding(0, 4, 0, 4)
			[
				SNew(STextBlock).Text(LOCTEXT("NameBoxLabel", "Name:"))
			];

		ContentBox->AddSlot()
			.AutoHeight() 
			.VAlign(VAlign_Center)
			.Padding(0, 0, 0, 0)
			[
				SAssignNew(NameEditableText, SEditableTextBox)
				.Text(this, &SAssetDialog::GetAssetNameText)
				.OnTextCommitted(this, &SAssetDialog::OnAssetNameTextCommited)
				.OnTextChanged(this, &SAssetDialog::OnAssetNameTextCommited, ETextCommit::Default)
				.SelectAllTextWhenFocused(true)
			];
	}

	// Buttons and asset name
	TSharedRef<SHorizontalBox> ButtonsAndNameBox = SNew(SHorizontalBox)
		+ SHorizontalBox::Slot()
		.AutoWidth()
		.HAlign(HAlign_Right)
		.VAlign(VAlign_Bottom)
		.Padding(0.f, 0.f, 4.f, 0.f)
		[
			LabelsBox
		]
		+ SHorizontalBox::Slot()
		.FillWidth(1)
		.VAlign(VAlign_Bottom)
		.Padding(4.f, 0.f) 
		[
			ContentBox
		]
		+ SHorizontalBox::Slot()
		.AutoWidth()
		.VAlign(VAlign_Bottom)
		.Padding(4.f, 0.f) 
		[
			SNew(SPrimaryButton)
			.Text(ConfirmButtonText)
			.IsEnabled(this, &SAssetDialog::IsConfirmButtonEnabled)
			.OnClicked(this, &SAssetDialog::OnConfirmClicked)
		]
		+ SHorizontalBox::Slot()
		.AutoWidth()
		.VAlign(VAlign_Bottom)
		.Padding(4.f, 0.f, 0.0f, 0.0f) 
		[
			SNew(SButton)
			.TextStyle(FAppStyle::Get(), "DialogButtonText")
			.Text(LOCTEXT("AssetDialogCancelButton", "Cancel"))
			.OnClicked(this, &SAssetDialog::OnCancelClicked)
		];

	MainVerticalBox->AddSlot()
		.AutoHeight()
		.HAlign(HAlign_Fill)
		.Padding(16.f, 4.f, 16.f, 16.f)
		[
			ButtonsAndNameBox
		];

	ChildSlot
	[
		MainVerticalBox
	];
}
END_SLATE_FUNCTION_BUILD_OPTIMIZATION

FReply SAssetDialog::OnKeyDown( const FGeometry& MyGeometry, const FKeyEvent& InKeyEvent )
{
	if ( InKeyEvent.GetKey() == EKeys::Escape )
	{
		CloseDialog();
		return FReply::Handled();
	}
	else if (Commands->ProcessCommandBindings(InKeyEvent))
	{
		return FReply::Handled();
	}

	return SCompoundWidget::OnKeyDown(MyGeometry, InKeyEvent);
}

void SAssetDialog::BindCommands()
{
	Commands = TSharedPtr< FUICommandList >(new FUICommandList);

	Commands->MapAction(FGenericCommands::Get().Rename, FUIAction(
		FExecuteAction::CreateSP(this, &SAssetDialog::ExecuteRename),
		FCanExecuteAction::CreateSP(this, &SAssetDialog::CanExecuteRename)
	));

	Commands->MapAction(FGenericCommands::Get().Delete, FUIAction(
		FExecuteAction::CreateSP(this, &SAssetDialog::ExecuteDelete),
		FCanExecuteAction::CreateSP(this, &SAssetDialog::CanExecuteDelete)
	));

	Commands->MapAction(FContentBrowserCommands::Get().CreateNewFolder, FUIAction(
		FExecuteAction::CreateSP(this, &SAssetDialog::ExecuteCreateNewFolder),
		FCanExecuteAction::CreateSP(this, &SAssetDialog::CanExecuteCreateNewFolder)
	));
}

bool SAssetDialog::CanExecuteRename() const
{
	switch (OpenedContextMenuWidget)
	{
		case EOpenedContextMenuWidget::AssetView: return ContentBrowserUtils::CanRenameFromAssetView(AssetPicker->GetAssetView());
		case EOpenedContextMenuWidget::PathView: return ContentBrowserUtils::CanRenameFromPathView(PathPicker->GetPathView());
	}

	return false;
}

void SAssetDialog::ExecuteRename()
{
	const TArray<FContentBrowserItem> SelectedItems = AssetPicker->GetAssetView()->GetSelectedItems();
	if (SelectedItems.Num() > 0)
	{
		if (SelectedItems.Num() == 1)
		{
			AssetPicker->GetAssetView()->RenameItem(SelectedItems[0]);
		}
	}
	else
	{		
		const TArray<FContentBrowserItem> SelectedFolders = PathPicker->GetPathView()->GetSelectedFolderItems();
		if (SelectedFolders.Num() == 1)
		{
			PathPicker->GetPathView()->RenameFolderItem(SelectedFolders[0]);
		}
	}
}

bool SAssetDialog::CanExecuteDelete() const
{
	switch (OpenedContextMenuWidget)
	{
		case EOpenedContextMenuWidget::AssetView: return ContentBrowserUtils::CanDeleteFromAssetView(AssetPicker->GetAssetView());
		case EOpenedContextMenuWidget::PathView: return ContentBrowserUtils::CanDeleteFromPathView(PathPicker->GetPathView());
	}

	return false;
}

void SAssetDialog::ExecuteDelete()
{
	// Don't allow asset deletion during PIE
	if (GIsEditor)
	{
		UEditorEngine* Editor = GEditor;
		FWorldContext* PIEWorldContext = GEditor->GetPIEWorldContext();
		if (PIEWorldContext)
		{
			FNotificationInfo Notification(LOCTEXT("CannotDeleteAssetInPIE", "Assets cannot be deleted while in PIE."));
			Notification.ExpireDuration = 3.0f;
			FSlateNotificationManager::Get().AddNotification(Notification);
			return;
		}
	}

	if (OpenedContextMenuWidget != EOpenedContextMenuWidget::PathView)
	{
		const TArray<FContentBrowserItem> SelectedFiles = AssetPicker->GetAssetView()->GetSelectedFileItems();

		// Batch these by their data sources
		TMap<UContentBrowserDataSource*, TArray<FContentBrowserItemData>> SourcesAndItems;
		for (const FContentBrowserItem& SelectedItem : SelectedFiles)
		{
			FContentBrowserItem::FItemDataArrayView ItemDataArray = SelectedItem.GetInternalItems();
			for (const FContentBrowserItemData& ItemData : ItemDataArray)
			{
				if (UContentBrowserDataSource* ItemDataSource = ItemData.GetOwnerDataSource())
				{
					FText DeleteErrorMsg;
					if (ItemDataSource->CanDeleteItem(ItemData, &DeleteErrorMsg))
					{
						TArray<FContentBrowserItemData>& ItemsForSource = SourcesAndItems.FindOrAdd(ItemDataSource);
						ItemsForSource.Add(ItemData);
					}
					else
					{
						AssetViewUtils::ShowErrorNotifcation(DeleteErrorMsg);
					}
				}
			}
		}

		// Execute the operation now
		for (const auto& SourceAndItemsPair : SourcesAndItems)
		{
			SourceAndItemsPair.Key->BulkDeleteItems(SourceAndItemsPair.Value);
		}
	}

	// List selected folders that can be deleted
	FText FirstFolderDisplayName;
	TArray<FString> SelectedFolderInternalPaths;
	{
		const TArray<FContentBrowserItem> SelectedFolderItems = (OpenedContextMenuWidget == EOpenedContextMenuWidget::PathView) ?
			PathPicker->GetPathView()->GetSelectedFolderItems() :
			AssetPicker->GetAssetView()->GetSelectedFolderItems();

		for (const FContentBrowserItem& SelectedItem : SelectedFolderItems)
		{
			if (SelectedItem.CanDelete())
			{
				// Only internal folders supported currently
				const FName ConvertedPath = SelectedItem.GetInternalPath();
				if (!ConvertedPath.IsNone())
				{
					if (SelectedFolderInternalPaths.Num() == 0)
					{
						FirstFolderDisplayName = SelectedItem.GetDisplayName();
					}

					SelectedFolderInternalPaths.Add(ConvertedPath.ToString());
				}
			}
		}
	}

	// If we had any folders selected, ask the user whether they want to delete them 
	// as it can be slow to build the deletion dialog on an accidental click
	if (SelectedFolderInternalPaths.Num() > 0)
	{
		FText Prompt;
		if (SelectedFolderInternalPaths.Num() == 1)
		{
			Prompt = FText::Format(LOCTEXT("FolderDeleteConfirm_Single", "Delete folder '{0}'?"), FirstFolderDisplayName);
		}
		else
		{
			Prompt = FText::Format(LOCTEXT("FolderDeleteConfirm_Multiple", "Delete {0} folders?"), SelectedFolderInternalPaths.Num());
		}

		const bool bResetSelection = OpenedContextMenuWidget == EOpenedContextMenuWidget::PathView;

		// Spawn a confirmation dialog since this is potentially a highly destructive operation
		ContentBrowserUtils::DisplayConfirmationPopup(
			Prompt,
			LOCTEXT("FolderDeleteConfirm_Yes", "Delete"),
			LOCTEXT("FolderDeleteConfirm_No", "Cancel"),
			AssetPicker->GetAssetView().ToSharedRef(),
			FOnClicked::CreateSP(this, &SAssetDialog::ExecuteDeleteFolderConfirmed, SelectedFolderInternalPaths, bResetSelection)
		);
	}
}

FReply SAssetDialog::ExecuteDeleteFolderConfirmed(const TArray<FString> SelectedFolderInternalPaths, const bool bResetSelection)
{
	if (SelectedFolderInternalPaths.Num() > 0)
	{
		if (ContentBrowserUtils::DeleteFolders(SelectedFolderInternalPaths))
		{
			if (bResetSelection)
			{
				// Since the contents of the asset view have just been deleted, set the default selected paths
				SelectDefaultPaths();
			}
		}
	}

	return FReply::Handled();
}

void SAssetDialog::SelectDefaultPaths()
{
	const TArray<FName> DefaultVirtualPathsToSelect = PathPicker->GetPathView()->GetDefaultPathsToSelect();

	TArray<FString> DefaultSelectedPaths;
	DefaultSelectedPaths.Reserve(DefaultVirtualPathsToSelect.Num());
	for (const FName DefaultVirtualPathToSelect : DefaultVirtualPathsToSelect)
	{
		DefaultSelectedPaths.Add(DefaultVirtualPathToSelect.ToString());
	}

	PathPicker->GetPathView()->SetSelectedPaths(DefaultSelectedPaths);

	FSourcesData DefaultSourcesData;
	DefaultSourcesData.VirtualPaths = DefaultVirtualPathsToSelect;
	AssetPicker->GetAssetView()->SetSourcesData(DefaultSourcesData);
}

bool SAssetDialog::ExecuteExploreInternal(bool bTest)
{
	bool bCanExplore = false;

	TArray<FContentBrowserItem> SelectedItems = AssetPicker->GetAssetView()->GetSelectedItems();
	if (SelectedItems.Num() == 0)
	{
		SelectedItems = PathPicker->GetPathView()->GetSelectedFolderItems();
	}

	for (const FContentBrowserItem& SelectedItem : SelectedItems)
	{
		FString ItemFilename;
		if (SelectedItem.GetItemPhysicalPath(ItemFilename))
		{
			const bool bExists = SelectedItem.IsFile() ? FPaths::FileExists(ItemFilename) : FPaths::DirectoryExists(ItemFilename);
			if (bExists)
			{
				bCanExplore = true;

				if (!bTest)
				{
					FPlatformProcess::ExploreFolder(*IFileManager::Get().ConvertToAbsolutePathForExternalAppForRead(*ItemFilename));
				}
				else
				{
					break;
				}
			}
		}
	}

	return bCanExplore;
}

void SAssetDialog::ExecuteExplore()
{
	//ExecuteExploreInternal(/*bTest*/ false);
	ContentBrowserUtils::ExploreFolders(AssetPicker->GetAssetView()->GetSelectedItems(), AssetPicker->GetAssetView().ToSharedRef());
}

bool SAssetDialog::CanExecuteExplore()
{
	return ExecuteExploreInternal(/*bTest*/ true);
}

bool SAssetDialog::CanExecuteCreateNewFolder() const
{	
	// We can only create folders when we have a single path selected
	UContentBrowserDataSubsystem* ContentBrowserData = IContentBrowserDataModule::Get().GetSubsystem();
	return ContentBrowserData->CanCreateFolder(GetCurrentSelectedVirtualPath(), nullptr);
}

void SAssetDialog::ExecuteCreateNewFolder()
{
	PathPicker->CreateNewFolder(GetCurrentSelectedVirtualPath().ToString(), CurrentContextMenuCreateNewFolderDelegate);
}

TSharedPtr<SWidget> SAssetDialog::OnGetFolderContextMenu(const TArray<FString>& SelectedPaths, FContentBrowserMenuExtender_SelectedPaths InMenuExtender, FOnCreateNewFolder InOnCreateNewFolder)
{
	if (FSlateApplication::Get().HasFocusedDescendants(PathPicker.ToSharedRef()))
	{
		OpenedContextMenuWidget = EOpenedContextMenuWidget::PathView;
	}
	else if (FSlateApplication::Get().HasFocusedDescendants(AssetPicker.ToSharedRef()))
	{
		OpenedContextMenuWidget = EOpenedContextMenuWidget::AssetView;
	}

	TSharedPtr<FExtender> Extender;
	if (InMenuExtender.IsBound())
	{
		Extender = InMenuExtender.Execute(SelectedPaths);
	}

	if (FSlateApplication::Get().HasFocusedDescendants(PathPicker.ToSharedRef()))
	{
		PathPicker->SetPaths(SelectedPaths);
	}

	CurrentContextMenuCreateNewFolderDelegate = InOnCreateNewFolder;

	FMenuBuilder MenuBuilder(true /*bInShouldCloseWindowAfterMenuSelection*/, Commands, Extender);
	SetupContextMenuContent(MenuBuilder, SelectedPaths);

	return MenuBuilder.MakeWidget();
}

TSharedPtr<SWidget> SAssetDialog::OnGetAssetContextMenu(const TArray<FAssetData>& SelectedAssets)
{
	OpenedContextMenuWidget = EOpenedContextMenuWidget::AssetView;

	FMenuBuilder MenuBuilder(true /*bInShouldCloseWindowAfterMenuSelection*/, Commands);

	CurrentContextMenuCreateNewFolderDelegate = FOnCreateNewFolder::CreateSP(AssetPicker->GetAssetView().Get(), &SAssetView::NewFolderItemRequested);

	TArray<FString> Paths;
	SetupContextMenuContent(MenuBuilder, Paths);

	return MenuBuilder.MakeWidget();
}

void SAssetDialog::SetupContextMenuContent(FMenuBuilder& MenuBuilder, const TArray<FString>& SelectedPaths)
{
	FText NewFolderToolTip;

	if (SelectedPaths.Num() > 0)
	{
		if (CanExecuteCreateNewFolder())
		{
			NewFolderToolTip = FText::Format(LOCTEXT("NewFolderTooltip_CreateIn", "Create a new folder in {0}."), FText::FromString(SelectedPaths[0]));
		}
		else
		{
			NewFolderToolTip = FText::Format(LOCTEXT("NewFolderTooltip_InvalidPath", "Cannot create new folders in {0}."), FText::FromString(SelectedPaths[0]));
		}
	}
	else
	{
		NewFolderToolTip = FText(LOCTEXT("NewFolderTooltip_InvalidAction", "Cannot create new folders when an asset is selected."));
	}

	MenuBuilder.BeginSection("AssetDialogOptions", LOCTEXT("AssetDialogMenuHeading", "Options"));

	MenuBuilder.AddMenuEntry(FContentBrowserCommands::Get().CreateNewFolder, NAME_None, LOCTEXT("NewFolder", "New Folder"), NewFolderToolTip, FSlateIcon(FAppStyle::GetAppStyleSetName(), "ContentBrowser.NewFolderIcon"));
	MenuBuilder.AddMenuEntry(FGenericCommands::Get().Rename, NAME_None, LOCTEXT("RenameFolder", "Rename"), LOCTEXT("RenameFolderTooltip", "Rename the selected folder."), FSlateIcon(FAppStyle::GetAppStyleSetName(), "ContentBrowser.AssetActions.Rename"));
	MenuBuilder.AddMenuEntry(FGenericCommands::Get().Delete, NAME_None, LOCTEXT("DeleteFolder", "Delete"), LOCTEXT("DeleteFolderTooltip", "Removes this folder and all assets it contains."));

	MenuBuilder.EndSection();

	if (CanExecuteExplore())
	{
		MenuBuilder.BeginSection("AssetDialogExplore", LOCTEXT("AssetDialogExploreHeading", "Explore"));
		MenuBuilder.AddMenuEntry(ContentBrowserUtils::GetExploreFolderText(),
			LOCTEXT("ExploreTooltip", "Finds this folder on disk."),
			FSlateIcon(FAppStyle::GetAppStyleSetName(), "SystemWideCommands.FindInContentBrowser"),
			FUIAction(FExecuteAction::CreateSP(this, &SAssetDialog::ExecuteExplore)));
		MenuBuilder.EndSection();
	}
}

EActiveTimerReturnType SAssetDialog::SetFocusPostConstruct( double InCurrentTime, float InDeltaTime )
{
	FocusNameBox();
	return EActiveTimerReturnType::Stop;
}

void SAssetDialog::SetOnAssetsChosenForOpen(const FOnAssetsChosenForOpen& InOnAssetsChosenForOpen)
{
	OnAssetsChosenForOpen = InOnAssetsChosenForOpen;
}

void SAssetDialog::SetOnObjectPathChosenForSave(const FOnObjectPathChosenForSave& InOnObjectPathChosenForSave)
{
	OnObjectPathChosenForSave = InOnObjectPathChosenForSave;
}

void SAssetDialog::SetOnAssetDialogCancelled(const FOnAssetDialogCancelled& InOnAssetDialogCancelled)
{
	OnAssetDialogCancelled = InOnAssetDialogCancelled;
}

void SAssetDialog::FocusNameBox()
{
	if ( NameEditableText.IsValid() )
	{
		FSlateApplication::Get().SetKeyboardFocus(NameEditableText.ToSharedRef(), EFocusCause::SetDirectly);
	}
}

FText SAssetDialog::GetAssetNameText() const
{
	return FText::FromString(CurrentlyEnteredAssetName);
}

FText SAssetDialog::GetPathNameText() const
{
	return FText::FromName(GetCurrentSelectedVirtualPath());
}

void SAssetDialog::OnAssetNameTextCommited(const FText& InText, ETextCommit::Type InCommitType)
{
	SetCurrentlyEnteredAssetName(InText.ToString());

	if ( InCommitType == ETextCommit::OnEnter )
	{
		CommitObjectPathForSave();
	}
}

EVisibility SAssetDialog::GetNameErrorLabelVisibility() const
{
	return GetNameErrorLabelText().IsEmpty() ? EVisibility::Hidden : EVisibility::Visible;
}

FText SAssetDialog::GetNameErrorLabelText() const
{
	if (!bLastInputValidityCheckSuccessful)
	{
		return LastInputValidityErrorText;
	}

	return FText::GetEmpty();
}

void SAssetDialog::HandlePathSelected(const FString& NewPath)
{
	FName ConvertedPath;
	const EContentBrowserPathType ConvertedPathType = IContentBrowserDataModule::Get().GetSubsystem()->TryConvertVirtualPath(NewPath, ConvertedPath);

	FARFilter NewFilter;

	NewFilter.ClassPaths.Append(AssetClassNames);
	NewFilter.PackagePaths.Add(*NewPath);

	SetCurrentlySelectedPath(ConvertedPath.ToString(), ConvertedPathType);

	SetFilterDelegate.ExecuteIfBound(NewFilter);
}

void SAssetDialog::HandleAssetViewFolderEntered(const FString& NewPath)
{
	SetCurrentlySelectedPath(NewPath, EContentBrowserPathType::Virtual);

	TArray<FString> NewPaths;
	NewPaths.Add(NewPath);
	SetPathsDelegate.Execute(NewPaths);
}

bool SAssetDialog::IsConfirmButtonEnabled() const
{
	switch (DialogType)
	{
	case EAssetDialogType::Open:
		return CurrentlySelectedAssets.Num() > 0;
	case EAssetDialogType::Save:
		return bLastInputValidityCheckSuccessful;
	default:
	    ensureMsgf(0, TEXT("AssetDialog type %d is not supported."), DialogType);
	    return false;
	}
}

FReply SAssetDialog::OnConfirmClicked()
{
	switch (DialogType)
	{
	case EAssetDialogType::Open:
	{
		TArray<FAssetData> SelectedAssets = GetCurrentSelectionDelegate.Execute();
		if (SelectedAssets.Num() > 0)
		{
			ChooseAssetsForOpen(SelectedAssets);
		}
		break;
	}

	case EAssetDialogType::Save:
		// @todo save asset validation (e.g. "asset already exists" check)
		CommitObjectPathForSave();
		break;

	default:
		ensureMsgf(0, TEXT("AssetDialog type %d is not supported."), DialogType);
		break;
	}
	return FReply::Handled();
}

FReply SAssetDialog::OnCancelClicked()
{
	CloseDialog();

	return FReply::Handled();
}

void SAssetDialog::OnAssetSelected(const FAssetData& AssetData)
{
	CurrentlySelectedAssets = GetCurrentSelectionDelegate.Execute();
	
	if ( AssetData.IsValid() )
	{
		SetCurrentlySelectedPath(AssetData.PackagePath.ToString(), EContentBrowserPathType::Internal);
		SetCurrentlyEnteredAssetName(AssetData.AssetName.ToString());
	}
}

void SAssetDialog::OnAssetsActivated(const TArray<FAssetData>& SelectedAssets, EAssetTypeActivationMethod::Type ActivationType)
{
	const bool bCorrectActivationMethod = (ActivationType == EAssetTypeActivationMethod::DoubleClicked || ActivationType == EAssetTypeActivationMethod::Opened);
	if (SelectedAssets.Num() > 0 && bCorrectActivationMethod)
	{
		switch (DialogType)
		{
		case EAssetDialogType::Open:
			ChooseAssetsForOpen(SelectedAssets);
			break;

		case EAssetDialogType::Save:
		{
			const FAssetData& AssetData = SelectedAssets[0];
			SetCurrentlySelectedPath(AssetData.PackagePath.ToString(), EContentBrowserPathType::Internal);
			SetCurrentlyEnteredAssetName(AssetData.AssetName.ToString());
			CommitObjectPathForSave();
			break;
		}

		default:
			ensureMsgf(0, TEXT("AssetDialog type %d is not supported."), DialogType);
			break;
		}
	}
}

void SAssetDialog::CloseDialog()
{
	TSharedPtr<SWindow> ContainingWindow = FSlateApplication::Get().FindWidgetWindow(AsShared());

	if (ContainingWindow.IsValid())
	{
		ContainingWindow->RequestDestroyWindow();
	}
}

void SAssetDialog::SetCurrentlySelectedPath(const FString& NewPath, const EContentBrowserPathType InPathType)
{
	CurrentlySelectedPath = NewPath;
	CurrentlySelectedPathType = InPathType;

	UpdateInputValidity();

	OnPathSelected.ExecuteIfBound(NewPath);
}

void SAssetDialog::SetCurrentlyEnteredAssetName(const FString& NewName)
{
	CurrentlyEnteredAssetName = NewName;
	UpdateInputValidity();
}

void SAssetDialog::UpdateInputValidity()
{
	bLastInputValidityCheckSuccessful = true;

	if ( CurrentlyEnteredAssetName.IsEmpty() )
	{
		// No error text for an empty name. Just fail validity.
		LastInputValidityErrorText = FText::GetEmpty();
		bLastInputValidityCheckSuccessful = false;
	}

	if (bLastInputValidityCheckSuccessful)
	{
		if ( CurrentlySelectedPath.IsEmpty() )
		{
			LastInputValidityErrorText = LOCTEXT("AssetDialog_NoPathSelected", "You must select a path.");
			bLastInputValidityCheckSuccessful = false;
		}
		else if (CurrentlySelectedPathType == EContentBrowserPathType::Virtual)
		{
			FName ConvertedPath;
			const EContentBrowserPathType ConvertedType = IContentBrowserDataModule::Get().GetSubsystem()->TryConvertVirtualPath(CurrentlySelectedPath, ConvertedPath);

			bool bIsMountedInternalPath = false;
			if (ConvertedType == EContentBrowserPathType::Internal)
			{
				FString CheckPath = ConvertedPath.ToString();
				if (!CheckPath.EndsWith(TEXT("/")))
				{
					CheckPath += TEXT("/");
				}

				if (FPackageName::IsValidPath(CheckPath))
				{
					bIsMountedInternalPath = true;
				}
			}

			if (!bIsMountedInternalPath)
			{
				LastInputValidityErrorText = LOCTEXT("AssetDialog_VirtualPathSelected", "You must select a non virtual path.");
				bLastInputValidityCheckSuccessful = false;
			}
		}
	}

	if ( DialogType == EAssetDialogType::Save )
	{
		if ( bLastInputValidityCheckSuccessful )
		{
			const FString ObjectPath = GetObjectPathForSave();
			FText ErrorMessage;
			const bool bAllowExistingAsset = (ExistingAssetPolicy == ESaveAssetDialogExistingAssetPolicy::AllowButWarn);

			FTopLevelAssetPath AssetClassName = AssetClassNames.Num() == 1 ? AssetClassNames[0] : FTopLevelAssetPath();
			UClass* AssetClass = !AssetClassName.IsNull() ? FindObject<UClass>(AssetClassName, true) : nullptr;

			if ( !ContentBrowserUtils::IsValidObjectPathForCreate(ObjectPath, AssetClass, ErrorMessage, bAllowExistingAsset) )
			{
				LastInputValidityErrorText = ErrorMessage;
				bLastInputValidityCheckSuccessful = false;
			}
			else if(bAllowExistingAsset && AssetClassNames.Num() > 1) // If for some reason we have multiple names, perform additional logic here...
			{
				FAssetRegistryModule& AssetRegistryModule = FModuleManager::LoadModuleChecked<FAssetRegistryModule>("AssetRegistry");
				FAssetData ExistingAsset = AssetRegistryModule.Get().GetAssetByObjectPath(FName(*ObjectPath));
				if (ExistingAsset.IsValid() && !AssetClassNames.Contains(ExistingAsset.AssetClassPath))
				{
					const FString ObjectName = FPackageName::ObjectPathToObjectName(ObjectPath);
					LastInputValidityErrorText = FText::Format(LOCTEXT("AssetDialog_AssetAlreadyExists", "An asset of type '{0}' already exists at this location with the name '{1}'."), FText::FromString(ExistingAsset.AssetClassPath.ToString()), FText::FromString(ObjectName));
					bLastInputValidityCheckSuccessful = false;
				}
			}
		}
	}
}

FName SAssetDialog::GetCurrentSelectedVirtualPath() const
{
	if (CurrentlySelectedPathType == EContentBrowserPathType::Virtual)
	{
		return *CurrentlySelectedPath;
	}
	else
	{
		return IContentBrowserDataModule::Get().GetSubsystem()->ConvertInternalPathToVirtual(*CurrentlySelectedPath);
	}
}

void SAssetDialog::ChooseAssetsForOpen(const TArray<FAssetData>& SelectedAssets)
{
	if ( ensure(DialogType == EAssetDialogType::Open) )
	{
		if (SelectedAssets.Num() > 0)
		{
			bValidAssetsChosen = true;
			OnAssetsChosenForOpen.ExecuteIfBound(SelectedAssets);
			CloseDialog();
		}
	}
}

FString SAssetDialog::GetObjectPathForSave() const
{
	FString Base = CurrentlySelectedPath;

	if (CurrentlySelectedPathType == EContentBrowserPathType::Virtual)
	{
		FName ConvertedPath;
		const EContentBrowserPathType ConvertedType = IContentBrowserDataModule::Get().GetSubsystem()->TryConvertVirtualPath(CurrentlySelectedPath, ConvertedPath);
		if (ConvertedType == EContentBrowserPathType::Internal)
		{
			Base = ConvertedPath.ToString();
		}
		else
		{
			return FString();
		}
	}

	return Base / CurrentlyEnteredAssetName + TEXT(".") + CurrentlyEnteredAssetName;
}

void SAssetDialog::CommitObjectPathForSave()
{
	if ( ensure(DialogType == EAssetDialogType::Save) )
	{
		if ( bLastInputValidityCheckSuccessful )
		{
			const FString ObjectPath = GetObjectPathForSave();

			bool bProceedWithSave = true;

			// If we were asked to warn on existing assets, do it now
			if ( ExistingAssetPolicy == ESaveAssetDialogExistingAssetPolicy::AllowButWarn )
			{
				FAssetRegistryModule& AssetRegistryModule = FModuleManager::LoadModuleChecked<FAssetRegistryModule>("AssetRegistry");
				FAssetData ExistingAsset = AssetRegistryModule.Get().GetAssetByObjectPath(FName(*ObjectPath));
				if ( ExistingAsset.IsValid() && AssetClassNames.Contains(ExistingAsset.AssetClassPath) )
				{
					EAppReturnType::Type ShouldReplace = FMessageDialog::Open( EAppMsgType::YesNo, FText::Format(LOCTEXT("ReplaceAssetMessage", "{0} already exists. Do you want to replace it?"), FText::FromString(CurrentlyEnteredAssetName)) );
					bProceedWithSave = (ShouldReplace == EAppReturnType::Yes);
				}
			}

			if ( bProceedWithSave )
			{
				bValidAssetsChosen = true;
				OnObjectPathChosenForSave.ExecuteIfBound(ObjectPath);
				CloseDialog();
			}
		}
	}
}

#undef LOCTEXT_NAMESPACE