ue5 c++ slate插件中资源查看的上下文菜单扩展 完整代码

下面是一个示例的完整代码，它可以在Slate插件中添加资源查看的上下文菜单扩展：

#include "MySlateModule.h"
#include "MyAsset.h"
#include "MyAssetEditor.h"
#include "MyAssetActions.h"

#define LOCTEXT_NAMESPACE "MySlateModule"

void FMySlateModule::StartupModule()
{
    // 注册资源类型
    IAssetTools& AssetTools = FModuleManager::LoadModuleChecked<FAssetToolsModule>("AssetTools").Get();
    TSharedPtr<IAssetTypeActions> AssetTypeActions = MakeShareable(new FMyAssetActions);
    AssetTools.RegisterAssetTypeActions(AssetTypeActions.ToSharedRef());

    // 添加上下文菜单扩展
    if (UAssetEditorSubsystem* AssetEditorSubsystem = GEditor->GetEditorSubsystem<UAssetEditorSubsystem>())
    {
        FAssetEditorExtenderDelegate AssetEditorExtenderDelegate = FAssetEditorExtenderDelegate::CreateRaw(this, &FMySlateModule::AddAssetEditorContextMenuExtender);
        AssetEditorSubsystem->OnExtendersChanged().AddRaw(this, &FMySlateModule::OnAssetEditorExtendersChanged);
        AssetEditorSubsystem->AddAssetEditorContextMenuExtender(AssetEditorExtenderDelegate);
    }
}

void FMySlateModule::ShutdownModule()
{
    // 取消注册资源类型
    IAssetTools& AssetTools = FModuleManager::LoadModuleChecked<FAssetToolsModule>("AssetTools").Get();
    for (TSharedPtr<IAssetTypeActions>& AssetTypeActions : AssetTools.GetAllAssetTypeActions())
    {
        AssetTools.UnregisterAssetTypeActions(AssetTypeActions.ToSharedRef());
    }

    // 移除上下文菜单扩展
    if (UAssetEditorSubsystem* AssetEditorSubsystem = GEditor->GetEditorSubsystem<UAssetEditorSubsystem>())
    {
        AssetEditorSubsystem->OnExtendersChanged().RemoveAll(this);
        AssetEditorSubsystem->RemoveAssetEditorContextMenuExtender(AssetEditorContextMenuExtenderDelegateHandle);
    }
}

void FMySlateModule::AddAssetEditorContextMenuExtender(UObject* Object, UBlueprintEditor* Editor, TArray<FExtender>& Extenders)
{
    if (UMyAsset* MyAsset = Cast<UMyAsset>(Object))
    {
        TSharedPtr<FExtender> Extender = MakeShareable(new FExtender);
        Extender->AddMenuExtension(
            "AssetEditorActions",
            EExtensionHook::After,
            nullptr,
            FMenuExtensionDelegate::CreateRaw(this, &FMySlateModule::AddAssetEditorContextMenuExtension, MyAsset)
        );
        Extenders.Add(Extender.ToSharedRef());
    }
}

void FMySlateModule::AddAssetEditorContextMenuExtension(FMenuBuilder& MenuBuilder, UMyAsset* MyAsset)
{
    MenuBuilder.BeginSection("MyAssetSection", LOCTEXT("MyAssetSectionLabel", "My Asset"));
    {
        MenuBuilder.AddMenuEntry(
            LOCTEXT("MyAssetViewSource", "View Source"),
            LOCTEXT("MyAssetViewSourceTooltip", "View the source code for this asset."),
            FSlateIcon(),
            FUIAction(
                FExecuteAction::CreateRaw(this, &FMySlateModule::OnViewSourceClicked, MyAsset),
                FCanExecuteAction::CreateLambda([]() { return true; })
            ),
            NAME_None,
            EUserInterfaceActionType::Button
        );
    }
    MenuBuilder.EndSection();
}

void FMySlateModule::OnAssetEditorExtendersChanged()
{
    if (UAssetEditorSubsystem* AssetEditorSubsystem = GEditor->GetEditorSubsystem<UAssetEditorSubsystem>())
    {
        AssetEditorContextMenuExtenderDelegateHandle = AssetEditorSubsystem->GetAssetEditorContextMenuExtender(GetModularFeatureName(), FName("BlueprintEditor")).GetHandle();
    }
}

void FMySlateModule::OnViewSourceClicked(UMyAsset* MyAsset)
{
    // 打开资源的源代码编辑器
    FMyAssetEditor::CreateEditor(EToolkitMode::Standalone, nullptr, MyAsset);
}

#undef LOCTEXT_NAMESPACE

IMPLEMENT_MODULE(FMySlateModule, MySlateModule)