void OnEnable()
        {
            // .asmdefをすべて取得
            var asmdefs         = CompilationPipeline.GetAssemblies();
            var allDependencies = new List <AsmdefDependency>();

            foreach (var asmdef in asmdefs)
            {
                allDependencies.Add(
                    new AsmdefDependency(
                        asmdef.name,
                        asmdef.assemblyReferences?.Select(x => x.name) ?? new string[0])
                    );
            }
            // viewの作成
            _asmdefGraphView = new AsmdefGraphView(allDependencies)
            {
                style = { flexGrow = 1 }
            };
            rootVisualElement.Add(_asmdefGraphView);
            rootVisualElement.pickingMode = PickingMode.Position;  // ピッキングモード変更
            rootVisualElement.AddManipulator(new ContextualMenuManipulator(OnContextMenuPopulate));
        }