Materials: Model Manager External Interface (#20825)

* Materials: Model Manager External Interface

Implement the ModelManagerExternal class for the external Materials
interface.

This is part of the ongoing merges of code to support external material
interfaces. In this PR the ModelManagerExternal class is implemented,
along with changes to supporting classes required for this class.

* Apply reviewer feedback

src/Mod/Material/App/ModelLibrary.h

@@ -35,6 +35,7 @@
 #include "Library.h"
 #include "MaterialValue.h"
 #include "Model.h"
+
 namespace Materials
 {
 
@@ -45,12 +46,44 @@ class MaterialsExport ModelLibrary: public Library,
 
 public:
     ModelLibrary();
+    ModelLibrary(const Library& other);
     ModelLibrary(const QString& libraryName,
                  const QString& dir,
                  const QString& icon,
                  bool readOnly = true);
+    ModelLibrary(const ModelLibrary& other) = delete;
     ~ModelLibrary() override = default;
 
+    bool isLocal() const;
+    void setLocal(bool local);
+
+    std::shared_ptr<std::map<QString, std::shared_ptr<ModelTreeNode>>>
+    getModelTree(ModelFilter filter) const;
+
+    // Use this to get a shared_ptr for *this
+    std::shared_ptr<ModelLibrary> getptr()
+    {
+        return shared_from_this();
+    }
+
+private:
+    bool _local;
+};
+
+class MaterialsExport ModelLibraryLocal: public ModelLibrary
+{
+    TYPESYSTEM_HEADER_WITH_OVERRIDE();
+
+public:
+    ModelLibraryLocal();
+    ModelLibraryLocal(const Library& other);
+    ModelLibraryLocal(const QString& libraryName,
+                 const QString& dir,
+                 const QString& icon,
+                 bool readOnly = true);
+    ModelLibraryLocal(const ModelLibraryLocal& other) = delete;
+    ~ModelLibraryLocal() override = default;
+
     bool operator==(const ModelLibrary& library) const
     {
         return Library::operator==(library);
@@ -63,16 +96,7 @@ public:
 
     std::shared_ptr<Model> addModel(const Model& model, const QString& path);
 
-    // Use this to get a shared_ptr for *this
-    std::shared_ptr<ModelLibrary> getptr()
-    {
-        return shared_from_this();
-    }
-    std::shared_ptr<std::map<QString, std::shared_ptr<ModelTreeNode>>>
-    getModelTree(ModelFilter filter) const;
-
 private:
-    ModelLibrary(const ModelLibrary&);
 
     std::unique_ptr<std::map<QString, std::shared_ptr<Model>>> _modelPathMap;
 };
@@ -80,5 +104,6 @@ private:
 }  // namespace Materials
 
 Q_DECLARE_METATYPE(std::shared_ptr<Materials::ModelLibrary>)
+Q_DECLARE_METATYPE(std::shared_ptr<Materials::ModelLibraryLocal>)
 
 #endif  // MATERIAL_MODELLIBRARY_H