Move ThumbnailerNullComponent into AzToolsFramework so that it can be used by other tools that need it.

SerializeContextTools will soon rely on this.

Code/Framework/AzToolsFramework/AzToolsFramework/AzToolsFrameworkModule.cpp

@@ -52,6 +52,7 @@
 #include <AzToolsFramework/UI/PropertyEditor/PropertyManagerComponent.h>
 #include <AzToolsFramework/UI/EditorEntityUi/EditorEntityUiSystemComponent.h>
 #include <AzToolsFramework/Thumbnails/ThumbnailerComponent.h>
+#include <AzToolsFramework/Thumbnails/ThumbnailerNullComponent.h>
 #include <AzToolsFramework/AssetBrowser/AssetBrowserComponent.h>
 #include <AzToolsFramework/ViewportSelection/EditorInteractionSystemComponent.h>
 
@@ -91,6 +92,7 @@ namespace AzToolsFramework
             AzToolsFramework::AssetBundleComponent::CreateDescriptor(),
             AzToolsFramework::SliceDependencyBrowserComponent::CreateDescriptor(),
             AzToolsFramework::Thumbnailer::ThumbnailerComponent::CreateDescriptor(),
+            AzToolsFramework::Thumbnailer::ThumbnailerNullComponent::CreateDescriptor(),
             AzToolsFramework::AssetBrowser::AssetBrowserComponent::CreateDescriptor(),
             AzToolsFramework::EditorInteractionSystemComponent::CreateDescriptor(),
             AzToolsFramework::Components::EditorComponentAPIComponent::CreateDescriptor(),

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/ThumbnailerNullComponent.cpp

@@ -0,0 +1,85 @@
+/*
+* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+* its licensors.
+*
+* For complete copyright and license terms please see the LICENSE at the root of this
+* distribution (the "License"). All use of this software is governed by the License,
+* or, if provided, by the license below or the license accompanying this file. Do not
+* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*
+*/
+
+#include <AzCore/std/smart_ptr/make_shared.h>
+#include <AzCore/Serialization/SerializeContext.h>
+#include <AzToolsFramework/Thumbnails/ThumbnailerNullComponent.h>
+#include <AzToolsFramework/Thumbnails/ThumbnailContext.h>
+#include <AzToolsFramework/Thumbnails/MissingThumbnail.h>
+
+namespace AzToolsFramework
+{
+    namespace Thumbnailer
+    {
+        ThumbnailerNullComponent::ThumbnailerNullComponent() :
+            m_nullThumbnail()
+        {
+        }
+
+        ThumbnailerNullComponent::~ThumbnailerNullComponent() = default;
+
+        void ThumbnailerNullComponent::Activate()
+        {
+            BusConnect();
+        }
+
+        void ThumbnailerNullComponent::Deactivate()
+        {
+            BusDisconnect();
+        }
+
+        void ThumbnailerNullComponent::Reflect(AZ::ReflectContext* context)
+        {
+            AZ::SerializeContext* serialize = azrtti_cast<AZ::SerializeContext*>(context);
+            if (serialize)
+            {
+                serialize->Class<ThumbnailerNullComponent, AZ::Component>();
+            }
+        }
+
+        void ThumbnailerNullComponent::GetProvidedServices(AZ::ComponentDescriptor::DependencyArrayType& services)
+        {
+            services.push_back(AZ_CRC("ThumbnailerService", 0x65422b97));
+        }
+
+        void ThumbnailerNullComponent::RegisterContext(const char* /*contextName*/)
+        {
+        }
+
+        void ThumbnailerNullComponent::UnregisterContext(const char* /*contextName*/)
+        {
+        }
+
+        bool ThumbnailerNullComponent::HasContext(const char* /*contextName*/) const
+        {
+            return false;
+        }
+
+        void ThumbnailerNullComponent::RegisterThumbnailProvider(AzToolsFramework::Thumbnailer::SharedThumbnailProvider /*provider*/, const char* /*contextName*/)
+        {
+        }
+
+        void ThumbnailerNullComponent::UnregisterThumbnailProvider(const char* /*providerName*/, const char* /*contextName*/)
+        {
+        }
+
+        AzToolsFramework::Thumbnailer::SharedThumbnail ThumbnailerNullComponent::GetThumbnail(AzToolsFramework::Thumbnailer::SharedThumbnailKey /*key*/, const char* /*contextName*/)
+        {
+            return m_nullThumbnail;
+        }
+
+        bool ThumbnailerNullComponent::IsLoading(AzToolsFramework::Thumbnailer::SharedThumbnailKey /*thumbnailKey*/, const char* /*contextName*/)
+        {
+            return false;
+        }
+    } // namespace Thumbnailer
+} // namespace AzToolsFramework

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/ThumbnailerNullComponent.h

@@ -0,0 +1,60 @@
+/*
+* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+* its licensors.
+*
+* For complete copyright and license terms please see the LICENSE at the root of this
+* distribution (the "License"). All use of this software is governed by the License,
+* or, if provided, by the license below or the license accompanying this file. Do not
+* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*
+*/
+#pragma once
+
+#include <AzCore/Memory/SystemAllocator.h>
+#include <AzCore/Component/Component.h>
+#include <AzToolsFramework/Thumbnails/ThumbnailerBus.h>
+
+// ThumbnailerNullComponent is an alternative to ThumbnailerComponent that can be used by tools that don't use Qt.
+// It doesn't do anything (hence "null"), but it allows the system and editor components that rely on the ThumbnailService
+// to start up and function.
+
+namespace AzToolsFramework
+{
+    namespace Thumbnailer
+    {
+        class ThumbnailContext;
+
+        class ThumbnailerNullComponent
+            : public AZ::Component
+            , public AzToolsFramework::Thumbnailer::ThumbnailerRequestsBus::Handler
+        {
+        public:
+            AZ_COMPONENT(ThumbnailerNullComponent, "{8009D651-3FAA-9815-B99E-AF174A3B29D4}")
+
+            ThumbnailerNullComponent();
+            virtual ~ThumbnailerNullComponent();
+
+            //////////////////////////////////////////////////////////////////////////
+            // AZ::Component
+            //////////////////////////////////////////////////////////////////////////
+            void Activate() override;
+            void Deactivate() override;
+            static void Reflect(AZ::ReflectContext* context);
+            static void GetProvidedServices(AZ::ComponentDescriptor::DependencyArrayType& services);
+
+            //////////////////////////////////////////////////////////////////////////
+            // ThumbnailerRequests
+            //////////////////////////////////////////////////////////////////////////
+            void RegisterContext(const char* contextName) override;
+            void UnregisterContext(const char* contextName) override;
+            bool HasContext(const char* contextName) const override;
+            void RegisterThumbnailProvider(AzToolsFramework::Thumbnailer::SharedThumbnailProvider provider, const char* contextName) override;
+            void UnregisterThumbnailProvider(const char* providerName, const char* contextName) override;
+            AzToolsFramework::Thumbnailer::SharedThumbnail GetThumbnail(AzToolsFramework::Thumbnailer::SharedThumbnailKey thumbnailKey, const char* contextName) override;
+            bool IsLoading(AzToolsFramework::Thumbnailer::SharedThumbnailKey thumbnailKey, const char* contextName) override;
+        private:
+            AzToolsFramework::Thumbnailer::SharedThumbnail m_nullThumbnail;
+        };
+    } // Thumbnailer
+} // namespace AzToolsFramework

Code/Framework/AzToolsFramework/AzToolsFramework/aztoolsframework_files.cmake

@@ -72,6 +72,8 @@ set(FILES
     AssetCatalog/PlatformAddressedAssetCatalogManager.cpp
     Thumbnails/ThumbnailerComponent.cpp
     Thumbnails/ThumbnailerComponent.h
+    Thumbnails/ThumbnailerNullComponent.cpp
+    Thumbnails/ThumbnailerNullComponent.h
     Thumbnails/LoadingThumbnail.cpp
     Thumbnails/LoadingThumbnail.h
     Thumbnails/MissingThumbnail.cpp