102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
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// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "EditorSubsystem.h"
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#include "UObject/ObjectMacros.h"
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#include "UObject/UObjectGlobals.h"
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#include "Templates/SubclassOf.h"
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#include "Containers/Queue.h"
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#include "Widgets/DeclarativeSyntaxSupport.h"
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#include "Widgets/SCompoundWidget.h"
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#include "PanelExtensionSubsystem.generated.h"
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PRAGMA_DISABLE_DEPRECATION_WARNINGS
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struct UNREALED_API FPanelExtensionFactory
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{
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public:
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/** An identifier to allow removal later on. */
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FName Identifier;
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/**
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* Delegate that generates the SExtensionPanel content widget.
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* The FWeakObjectPtr param is an opaque context specific to the panel that is being extended
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* which can be used to customize or populate the extension widget.
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*/
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DECLARE_DELEGATE_RetVal_OneParam(TSharedRef<SWidget>, FCreateExtensionWidget, FWeakObjectPtr);
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FCreateExtensionWidget CreateExtensionWidget;
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UE_DEPRECATED(4.26, "Use FCreateExtensionWidget instead")
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DECLARE_DELEGATE_RetVal_OneParam(TSharedRef<SWidget>, FGenericCreateWidget, const TArray<UObject*>&);
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UE_DEPRECATED(4.26, "Use CreateExtensionWidget instead")
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FGenericCreateWidget CreateWidget;
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};
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PRAGMA_ENABLE_DEPRECATION_WARNINGS
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class UNREALED_API SExtensionPanel: public SCompoundWidget
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{
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public:
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~SExtensionPanel();
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SLATE_BEGIN_ARGS(SExtensionPanel)
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: _ExtensionPanelID(), _DefaultWidget(), _ExtensionContext()
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{}
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/** The ID to identify this Extension point */
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SLATE_ATTRIBUTE(FName, ExtensionPanelID)
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/** The widget to use as content if FPanelExtensionFactory::CreateExtensionWidget returns nullptr */
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SLATE_ATTRIBUTE(TSharedPtr<SWidget>, DefaultWidget)
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/** Context used to customize or populate the extension widget (specific to each panel extension) */
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SLATE_ATTRIBUTE(FWeakObjectPtr, ExtensionContext)
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SLATE_END_ARGS()
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/** Constructs the widget */
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void Construct(const FArguments& InArgs);
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UObject* GetExtensionContext() const { return ExtensionContext.Get(); }
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private:
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void RebuildWidget();
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FName ExtensionPanelID;
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TSharedPtr<SWidget> DefaultWidget;
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FWeakObjectPtr ExtensionContext;
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};
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/**
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* UPanelExtensionSubsystem
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* Subsystem for creating extensible panels in the Editor
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*/
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UCLASS()
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class UNREALED_API UPanelExtensionSubsystem: public UEditorSubsystem
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{
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GENERATED_BODY()
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public:
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UPanelExtensionSubsystem();
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virtual void Initialize(FSubsystemCollectionBase& Collection) override;
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virtual void Deinitialize() override;
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void RegisterPanelFactory(FName ExtensionPanelID, const FPanelExtensionFactory& InPanelExtensionFactory);
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void UnregisterPanelFactory(FName Identifier, FName ExtensionPanelID = NAME_None);
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bool IsPanelFactoryRegistered(FName Identifier, FName ExtensionPanelID = NAME_None) const;
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protected:
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friend class SExtensionPanel;
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TSharedRef<SWidget> CreateWidget(FName ExtensionPanelID, FWeakObjectPtr ExtensionContext);
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DECLARE_MULTICAST_DELEGATE(FPanelFactoryRegistryChanged);
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FPanelFactoryRegistryChanged& OnPanelFactoryRegistryChanged(FName ExtensionPanelID);
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private:
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TMap<FName, TArray<FPanelExtensionFactory>> ExtensionPointMap;
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TMap<FName, FPanelFactoryRegistryChanged> PanelFactoryRegistryChangedCallbackMap;
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};
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