UE5 c++将自定义UserWdiget添加到对应菜单栏

前言：

为了实现与UserWidget一致的右键添加，便有了此章
注：这里使用的是UE5.3

目标内容：

在这里插入图片描述

这里可以参考UserWidget的源码，拷贝一份属于自己的就ok（本篇章只是全改成了属于自己的CommonUserWidget）

Runtime模块需要添加内容

首先创建一份自己Runtime模块的对象，我这取名是UCommonUserWidget

.h

#pragma once#include "Blueprint/UserWidget.h"
#include "CommonUserWidget.generated.h"UCLASS(BlueprintType, Blueprintable)
class DIVINEPROLOGUE_API UCommonUserWidget : public UUserWidget
{GENERATED_BODY()
public:}
};

主要实现内容是：UFactory
这里需要创建一个Editor模块，添加以下代码：

.h

//这个创建是因为本着改了都改，就创建了一份
#pragma once
#include "WidgetBlueprint.h"
#include "CommonWidgetBlueprint.generated.h"/*** The widget blueprint enables extending UCommonWidgetBlueprint the user extensible UWidget.*/
UCLASS(BlueprintType)
class UCommonWidgetBlueprint : public UWidgetBlueprint
{GENERATED_BODY()
public:UCommonWidgetBlueprint(){}
};

.h

// Copyright Epic Games, Inc. All Rights Reserved.#pragma once#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "Templates/SubclassOf.h"
#include "Factories/Factory.h"
#include "Engine/Blueprint.h"
#include "CommonUserWidgetFactory.generated.h"UCLASS(HideCategories=Object, MinimalAPI)
class UCommonUserWidgetFactory : public UFactory
{GENERATED_UCLASS_BODY()// The type of blueprint that will be createdUPROPERTY(EditAnywhere, Category=WidgetBlueprintFactory)TEnumAsByte<enum EBlueprintType> BlueprintType;// The parent class of the created blueprintUPROPERTY(EditAnywhere, Category=WidgetBlueprintFactory, meta=(AllowAbstract = ""))TSubclassOf<class UUserWidget> ParentClass;//~ Begin UFactory Interfacevirtual bool ConfigureProperties() override;virtual bool ShouldShowInNewMenu() const override;virtual UObject* FactoryCreateNew(UClass* Class, UObject* InParent, FName Name, EObjectFlags Flags, UObject* Context, FFeedbackContext* Warn, FName CallingContext) override;virtual UObject* FactoryCreateNew(UClass* Class, UObject* InParent, FName Name, EObjectFlags Flags, UObject* Context, FFeedbackContext* Warn) override;//~ Begin UFactory Interface	private:UPROPERTY(Transient)TObjectPtr<UClass> RootWidgetClass;
};

.cpp

// Copyright Epic Games, Inc. All Rights Reserved.#include "CommonUserWidgetFactory.h"
#include "UObject/Interface.h"
#include "Misc/MessageDialog.h"
#include "Blueprint/UserWidget.h"
#include "Blueprint/WidgetBlueprintGeneratedClass.h"
#include "WidgetBlueprint.h"
#include "Kismet2/KismetEditorUtilities.h"
#include "Modules/ModuleManager.h"
#include "UMGEditorModule.h"#include "Blueprint/WidgetTree.h"
#include "UMGEditorProjectSettings.h"
#include "ClassViewerModule.h"
#include "Kismet2/SClassPickerDialog.h"
#include "ClassViewerFilter.h"
#include "CommonUserWidget.h"
#include "CommonWidgetBlueprint.h"
#include "Components/CanvasPanel.h"#define LOCTEXT_NAMESPACE "UCommonUserWidgetFactory"/*------------------------------------------------------------------------------UCommonUserWidgetFactory implementation.
------------------------------------------------------------------------------*/class FWidgetClassFilter : public IClassViewerFilter
{
public:/** All children of these classes will be included unless filtered out by another setting. */TSet <const UClass*> AllowedChildrenOfClasses;/** Disallowed class flags. */EClassFlags DisallowedClassFlags;virtual bool IsClassAllowed(const FClassViewerInitializationOptions& InInitOptions, const UClass* InClass, TSharedRef< FClassViewerFilterFuncs > InFilterFuncs) override{return !InClass->HasAnyClassFlags(DisallowedClassFlags)&& InFilterFuncs->IfInChildOfClassesSet(AllowedChildrenOfClasses, InClass) != EFilterReturn::Failed;}virtual bool IsUnloadedClassAllowed(const FClassViewerInitializationOptions& InInitOptions, const TSharedRef< const IUnloadedBlueprintData > InUnloadedClassData, TSharedRef< FClassViewerFilterFuncs > InFilterFuncs) override{return !InUnloadedClassData->HasAnyClassFlags(DisallowedClassFlags)&& InFilterFuncs->IfInChildOfClassesSet(AllowedChildrenOfClasses, InUnloadedClassData) != EFilterReturn::Failed;}};UCommonUserWidgetFactory::UCommonUserWidgetFactory(const FObjectInitializer& ObjectInitializer): Super(ObjectInitializer)
{bCreateNew = true;bEditAfterNew = true;SupportedClass = UCommonWidgetBlueprint::StaticClass();ParentClass = nullptr;
}bool UCommonUserWidgetFactory::ConfigureProperties()
{if (GetDefault<UUMGEditorProjectSettings>()->bUseUserWidgetParentClassViewerSelector || GetDefault<UUMGEditorProjectSettings>()->bUseUserWidgetParentDefaultClassViewerSelector){FClassViewerModule& ClassViewerModule = FModuleManager::LoadModuleChecked<FClassViewerModule>("ClassViewer");// Fill in optionsFClassViewerInitializationOptions Options;Options.DisplayMode = EClassViewerDisplayMode::Type::TreeView;Options.Mode = EClassViewerMode::ClassPicker;Options.bShowNoneOption = false;Options.bExpandAllNodes = true;Options.bShowDefaultClasses = GetDefault<UUMGEditorProjectSettings>()->bUseUserWidgetParentDefaultClassViewerSelector;Options.bShowClassesViewer = GetDefault<UUMGEditorProjectSettings>()->bUseUserWidgetParentClassViewerSelector;TSharedPtr<FWidgetClassFilter> Filter = MakeShareable(new FWidgetClassFilter);Options.ClassFilters.Add(Filter.ToSharedRef());const TArray<TSoftClassPtr<UUserWidget>>& FavoriteWidgetParentClasses = GetDefault<UUMGEditorProjectSettings>()->FavoriteWidgetParentClasses;for (int32 Index = 0; Index < FavoriteWidgetParentClasses.Num(); ++Index){UClass* FavoriteWidgetParentClass = FavoriteWidgetParentClasses[Index].LoadSynchronous();if (FavoriteWidgetParentClass && FavoriteWidgetParentClass->IsChildOf(UCommonUserWidget::StaticClass())){if (!Options.ExtraPickerCommonClasses.Contains(FavoriteWidgetParentClass)){Options.ExtraPickerCommonClasses.Add(FavoriteWidgetParentClass);}}}if (Options.ExtraPickerCommonClasses.Num() == 0){Options.ExtraPickerCommonClasses.Add(UCommonUserWidget::StaticClass());}Filter->DisallowedClassFlags = CLASS_Deprecated | CLASS_NewerVersionExists | CLASS_Hidden | CLASS_HideDropDown;Filter->AllowedChildrenOfClasses.Add(UCommonUserWidget::StaticClass());const FText TitleText = LOCTEXT("CreateCommonWidgetBlueprint", "Pick Parent Class for New  Widget Blueprint");UClass* ChosenParentClass = nullptr;bool isSuccessful = SClassPickerDialog::PickClass(TitleText, Options, ChosenParentClass, UCommonUserWidget::StaticClass());ParentClass = ChosenParentClass ? ChosenParentClass : UCommonUserWidget::StaticClass();if (!isSuccessful){return false;}}if (GetDefault<UUMGEditorProjectSettings>()->bUseWidgetTemplateSelector){// Load the classviewer module to display a class pickerFClassViewerModule& ClassViewerModule = FModuleManager::LoadModuleChecked<FClassViewerModule>("ClassViewer");// Fill in optionsFClassViewerInitializationOptions Options;Options.Mode = EClassViewerMode::ClassPicker;Options.bShowNoneOption = true;TArray<TSoftClassPtr<UPanelWidget>> CommonRootWidgetClasses = GetDefault <UUMGEditorProjectSettings>()->CommonRootWidgetClasses;for (int32 Index = 0; Index < CommonRootWidgetClasses.Num(); ++Index){UClass* PanelWidgetClass = CommonRootWidgetClasses[Index].LoadSynchronous();if (PanelWidgetClass && PanelWidgetClass->IsChildOf(UPanelWidget::StaticClass())){if (!Options.ExtraPickerCommonClasses.Contains(PanelWidgetClass)){Options.ExtraPickerCommonClasses.Add(PanelWidgetClass);}}}if (Options.ExtraPickerCommonClasses.Num() == 0){Options.ExtraPickerCommonClasses.Add(UCanvasPanel::StaticClass());}TSharedPtr<FWidgetClassFilter> Filter = MakeShareable(new FWidgetClassFilter);Options.ClassFilters.Add(Filter.ToSharedRef());Filter->DisallowedClassFlags = CLASS_Abstract | CLASS_Deprecated | CLASS_NewerVersionExists;Filter->AllowedChildrenOfClasses.Add(UPanelWidget::StaticClass());const FText TitleText = LOCTEXT("CreateRootWidgetBlueprint", "Pick Root Widget for New Widget Blueprint");return SClassPickerDialog::PickClass(TitleText, Options, static_cast<UClass*&>(RootWidgetClass), UPanelWidget::StaticClass());}return true;
}bool UCommonUserWidgetFactory::ShouldShowInNewMenu() const
{return true;
}UObject* UCommonUserWidgetFactory::FactoryCreateNew(UClass* Class, UObject* InParent, FName Name, EObjectFlags Flags, UObject* Context, FFeedbackContext* Warn, FName CallingContext)
{// Make sure we are trying to factory a Anim Blueprint, then create and init onecheck(Class->IsChildOf(UCommonWidgetBlueprint::StaticClass()));UClass* CurrentParentClass = ParentClass;if (CurrentParentClass == nullptr){CurrentParentClass = UCommonUserWidget::StaticClass();}// If they selected an interface, force the parent class to be UInterfaceif (BlueprintType == BPTYPE_Interface){CurrentParentClass = UInterface::StaticClass();}if ( (CurrentParentClass == nullptr) || !FKismetEditorUtilities::CanCreateBlueprintOfClass(CurrentParentClass) || !CurrentParentClass->IsChildOf(UCommonUserWidget::StaticClass()) ){FFormatNamedArguments Args;Args.Add( TEXT("ClassName"), CurrentParentClass ? FText::FromString( CurrentParentClass->GetName()) : LOCTEXT("Null", "(null)") );FMessageDialog::Open( EAppMsgType::Ok, FText::Format( LOCTEXT("CannotCreateCommonWidgetBlueprint", "Cannot create a Common Widget Blueprint based on the class '{ClassName}'."), Args ) );return nullptr;}else{if (!GetDefault<UUMGEditorProjectSettings>()->bUseWidgetTemplateSelector){RootWidgetClass = GetDefault<UUMGEditorProjectSettings>()->DefaultRootWidget;}UCommonWidgetBlueprint* NewBP = CastChecked<UCommonWidgetBlueprint>(FKismetEditorUtilities::CreateBlueprint(CurrentParentClass, InParent, Name, BlueprintType, UCommonWidgetBlueprint::StaticClass(), UWidgetBlueprintGeneratedClass::StaticClass(), CallingContext));// Create the desired root widget specified by the projectif ( NewBP->WidgetTree->RootWidget == nullptr ){if (TSubclassOf<UPanelWidget> RootWidgetPanel = RootWidgetClass){UWidget* Root = NewBP->WidgetTree->ConstructWidget<UWidget>(RootWidgetPanel);NewBP->WidgetTree->RootWidget = Root;}}{IUMGEditorModule::FWidgetBlueprintCreatedArgs Args;Args.ParentClass = CurrentParentClass;Args.Blueprint = NewBP;IUMGEditorModule& UMGEditor = FModuleManager::LoadModuleChecked<IUMGEditorModule>("UMGEditor");UMGEditor.OnWidgetBlueprintCreated().Broadcast(Args);}return NewBP;}
}UObject* UCommonUserWidgetFactory::FactoryCreateNew(UClass* Class, UObject* InParent, FName Name, EObjectFlags Flags, UObject* Context, FFeedbackContext* Warn)
{return FactoryCreateNew(Class, InParent, Name, Flags, Context, Warn, NAME_None);
}#undef LOCTEXT_NAMESPACE

这样运行起来之后，会发现右键内容已经有了但是，名字不对，类型也不对，但是已经能正常创建出来了，因为我们还需要创建一个UAssetDefinitionDefault
在这里插入图片描述
在这里插入图片描述
.h

// Copyright Epic Games, Inc. All Rights Reserved.#pragma once
#include "CoreMinimal.h"
#include "AssetDefinitionDefault.h"#include "AssetDefinition_CommonWidgetBlueprint.generated.h"UCLASS()
class UAssetDefinition_CommonWidgetBlueprint : public UAssetDefinitionDefault
{GENERATED_BODY()public:UAssetDefinition_CommonWidgetBlueprint();virtual ~UAssetDefinition_CommonWidgetBlueprint() override;// UAssetDefinition Beginvirtual FText GetAssetDisplayName() const override;virtual FLinearColor GetAssetColor() const override;virtual TSoftClassPtr<UObject> GetAssetClass() const override;virtual TConstArrayView<FAssetCategoryPath> GetAssetCategories() const override;virtual EAssetCommandResult OpenAssets(const FAssetOpenArgs& OpenArgs) const override;virtual EAssetCommandResult PerformAssetDiff(const FAssetDiffArgs& DiffArgs) const override;virtual FText GetAssetDescription(const FAssetData& AssetData) const override;// UAssetDefinition End
};

.cpp

#include "AssetDefinition_CommonWidgetBlueprint.h"
#include "CommonWidgetBlueprint.h"
#include "WidgetBlueprintEditor.h"
#include "Misc/MessageDialog.h"
#include "SBlueprintDiff.h"#define LOCTEXT_NAMESPACE "AssetTypeActions"UAssetDefinition_CommonWidgetBlueprint::UAssetDefinition_CommonWidgetBlueprint() = default;UAssetDefinition_CommonWidgetBlueprint::~UAssetDefinition_CommonWidgetBlueprint() = default;FText UAssetDefinition_CommonWidgetBlueprint::GetAssetDisplayName() const
{return LOCTEXT("UAssetDefinition_CommonWidgetBlueprint", "Common Widget Blueprint");
}FLinearColor UAssetDefinition_CommonWidgetBlueprint::GetAssetColor() const
{return FLinearColor(FColor(44, 89, 180));
}TSoftClassPtr<> UAssetDefinition_CommonWidgetBlueprint::GetAssetClass() const
{return UCommonWidgetBlueprint::StaticClass();
}TConstArrayView<FAssetCategoryPath> UAssetDefinition_CommonWidgetBlueprint::GetAssetCategories() const
{static const TArray<FAssetCategoryPath, TFixedAllocator<1>> Categories = { EAssetCategoryPaths::UI };return Categories;
}EAssetCommandResult UAssetDefinition_CommonWidgetBlueprint::OpenAssets(const FAssetOpenArgs& OpenArgs) const
{EToolkitMode::Type Mode = OpenArgs.GetToolkitMode();EAssetCommandResult Result = EAssetCommandResult::Unhandled;for (UBlueprint* Blueprint : OpenArgs.LoadObjects<UBlueprint>()){if (Blueprint && Blueprint->SkeletonGeneratedClass && Blueprint->GeneratedClass){TSharedRef<FWidgetBlueprintEditor> NewBlueprintEditor(new FWidgetBlueprintEditor);const bool bShouldOpenInDefaultsMode = false;TArray<UBlueprint*> Blueprints;Blueprints.Add(Blueprint);NewBlueprintEditor->InitWidgetBlueprintEditor(Mode, OpenArgs.ToolkitHost, Blueprints, bShouldOpenInDefaultsMode);}else{FMessageDialog::Open( EAppMsgType::Ok, LOCTEXT("FailedToLoadWidgetBlueprint", "Widget Blueprint could not be loaded because it derives from an invalid class.\nCheck to make sure the parent class for this blueprint hasn't been removed!"));}Result = EAssetCommandResult::Handled;}return Result;
}EAssetCommandResult UAssetDefinition_CommonWidgetBlueprint::PerformAssetDiff(const FAssetDiffArgs& DiffArgs) const
{const UBlueprint* OldBlueprint = Cast<UBlueprint>(DiffArgs.OldAsset);const UBlueprint* NewBlueprint = Cast<UBlueprint>(DiffArgs.NewAsset);UClass* AssetClass = GetAssetClass().Get();SBlueprintDiff::CreateDiffWindow(OldBlueprint, NewBlueprint, DiffArgs.OldRevision, DiffArgs.NewRevision, AssetClass);return EAssetCommandResult::Handled;
}FText UAssetDefinition_CommonWidgetBlueprint::GetAssetDescription(const FAssetData& AssetData) const
{FString Description = AssetData.GetTagValueRef<FString>( GET_MEMBER_NAME_CHECKED( UBlueprint, BlueprintDescription ) );if ( !Description.IsEmpty() ){Description.ReplaceInline( TEXT( "\\n" ), TEXT( "\n" ) );return FText::FromString( MoveTemp(Description) );}return FText::GetEmpty();
}#undef LOCTEXT_NAMESPACE

这时候就得到了我们想要的结果：
在这里插入图片描述

往自己的UserWidget添加测试代码，发现能正常反射处理，因此此篇幅完成

在这里插入图片描述
在这里插入图片描述
对，别忘记添加Editor模块：

        "UnrealEd","UMGEditor", "UMG","AssetDefinition","Kismet",

Runtime模块：

        "UMG",

在这里插入图片描述

当然完结了也没完全完，有人可能比较喜欢像我一样做一些明显的图标，便于选中，这里只需要添加Style就行：
Editor模块：

.h

// Copyright Epic Games, Inc. All Rights Reserved.#pragma once#include "Styling/SlateStyle.h"/** Manages the style which provides resources for niagara editor widgets. */
class FDivinePrologueEditorStyle : public FSlateStyleSet
{
public:static  void Register();static  void Unregister();static  void Shutdown();/** reloads textures used by slate renderer */static  void ReloadTextures();/** @return The Slate style set for niagara editor widgets */static  const FDivinePrologueEditorStyle& Get();static  void ReinitializeStyle();virtual const FName& GetStyleSetName() const override;private:	FDivinePrologueEditorStyle();void InitIcons();static TSharedPtr<FDivinePrologueEditorStyle> DivinePrologueEditorStyle;
};

.cpp
// Copyright Epic Games, Inc. All Rights Reserved.#include "DivinePrologueEditorStyle.h"
#include "Styling/SlateStyleMacros.h"
#include "Styling/SlateStyleRegistry.h"TSharedPtr<FDivinePrologueEditorStyle> FDivinePrologueEditorStyle::DivinePrologueEditorStyle = nullptr;void FDivinePrologueEditorStyle::Register()
{FSlateStyleRegistry::RegisterSlateStyle(Get());
}void FDivinePrologueEditorStyle::Unregister()
{FSlateStyleRegistry::UnRegisterSlateStyle(Get());
}void FDivinePrologueEditorStyle::Shutdown()
{Unregister();DivinePrologueEditorStyle.Reset();
}const FVector2D Icon8x8(8.0f, 8.0f);
const FVector2D Icon12x12(12.0f, 12.0f);
const FVector2D Icon16x16(16.0f, 16.0f);
const FVector2D Icon20x20(20.0f, 20.0f);
const FVector2D Icon32x32(32.0f, 32.0f);
const FVector2D Icon40x40(40.0f, 40.0f);
const FVector2D Icon64x64(64.0f, 64.0f);FDivinePrologueEditorStyle::FDivinePrologueEditorStyle() : FSlateStyleSet("DivinePrologueEditorStyle")
{FSlateStyleSet::SetContentRoot(FPaths::ProjectContentDir() / TEXT("StyleTextures"));FSlateStyleSet::SetCoreContentRoot(FPaths::ProjectContentDir() / TEXT("StyleTextures"));InitIcons();
}void FDivinePrologueEditorStyle::InitIcons()
{Set("CommonUserWidget.Icon", new IMAGE_BRUSH("Icon", Icon64x64));
}void FDivinePrologueEditorStyle::ReloadTextures()
{FSlateApplication::Get().GetRenderer()->ReloadTextureResources();
}const FDivinePrologueEditorStyle& FDivinePrologueEditorStyle::Get()
{if(!DivinePrologueEditorStyle.IsValid()){DivinePrologueEditorStyle = MakeShareable(new FDivinePrologueEditorStyle());}return *DivinePrologueEditorStyle;
}void FDivinePrologueEditorStyle::ReinitializeStyle()
{Unregister();DivinePrologueEditorStyle.Reset();Register();	
}const FName& FDivinePrologueEditorStyle::GetStyleSetName() const
{static FName StyleName("DivinePrologueEditorStyle");return StyleName;
}

这是我的路径：在这里插入图片描述
当然创建之后需要在模块启动时候注册它：
在这里插入图片描述
在UCommonUserWidgetFactory里面重载下面方法，返回我们Style里面对应的图片：

	virtual FName GetNewAssetThumbnailOverride() const override{return TEXT("CommonUserWidget.Icon");}

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