public async System.Threading.Tasks.Task OnDragDropViewport(ViewPort.ViewPortControl viewport, System.Windows.Forms.DragEventArgs e)
        {
            var dropActor = await EngineNS.GamePlay.Actor.GActor.NewMeshActorAsync(this.ResourceName);

            dropActor.SpecialName = EngineNS.GamePlay.SceneGraph.GSceneGraph.GeneratorActorSpecialNameInEditor(this.ResourceName.PureName(), viewport.World);
            EngineNS.CEngine.Instance.HitProxyManager.MapActor(dropActor);
            var viewPortPos = viewport.PointFromScreen(new System.Windows.Point(e.X, e.Y));
            var pos         = viewport.GetPickRayLineCheckPosition((float)viewPortPos.X, (float)viewPortPos.Y);

            dropActor.Placement.Location = pos;
            var selActors = new List <ViewPort.ViewPortControl.SelectActorData>(viewport.GetSelectedActors());

            var redoAction = new Action <object>((obj) =>
            {
                viewport.World.AddActor(dropActor);
                viewport.World.DefaultScene.AddActor(dropActor);
                viewport.SelectActor(dropActor);
            });

            redoAction.Invoke(null);
            EditorCommon.UndoRedo.UndoRedoManager.Instance.AddCommand("WorldEditOperation", null, redoAction, null, (obj) =>
            {
                viewport.World.RemoveActor(dropActor.ActorId);
                viewport.World.DefaultScene.RemoveActor(dropActor.ActorId);
                dropActor.Selected = false;
                viewport.SelectActors(selActors.ToArray());
            }, "添加对象");

            if (mPreviewActor != null)
            {
                await mPreviewActor.AwaitLoad();
            }
            viewport.World.RemoveActor(mPreviewActor.mPreviewActor.ActorId);
            viewport.World.DefaultScene.RemoveActor(mPreviewActor.mPreviewActor.ActorId);
        }
        public async System.Threading.Tasks.Task OnDragDropViewport(ViewPort.ViewPortControl viewport, System.Windows.Forms.DragEventArgs e)
        {
            var dropActor = await EngineNS.GamePlay.Actor.GActor.NewPrefabActorAsync(this.ResourceName);

            string sname = this.ResourceName.GetFileName();

            //dropActor.SpecialName = sname;
            MapPrefabActor(dropActor);
            var viewPortPos = viewport.PointFromScreen(new System.Windows.Point(e.X, e.Y));
            var pos         = viewport.GetPickRayLineCheckPosition((float)viewPortPos.X, (float)viewPortPos.Y);

            dropActor.Placement.Location = pos;
            var selActors = new List <ViewPort.ViewPortControl.SelectActorData>(viewport.GetSelectedActors());

            var redoAction = new Action <object>((obj) =>
            {
                viewport.AddActor(dropActor);
            });

            redoAction.Invoke(null);
            EditorCommon.UndoRedo.UndoRedoManager.Instance.AddCommand("WorldEditOperation", null, redoAction, null, (obj) =>
            {
                viewport.World.RemoveActor(dropActor.ActorId);
                viewport.World.DefaultScene.RemoveActor(dropActor.ActorId);

                //for (int i = dropActor.Children.Count - 1; i >= 0; i--)
                //{
                //    EngineNS.GamePlay.Actor.GActor actor = dropActor.Children[i];
                //    actor.Parent.SetParent(null);
                //    viewport.World.RemoveActor(actor.ActorId);
                //    viewport.World.DefaultScene.RemoveActor(actor.ActorId);
                //}


                dropActor.Selected = false;
                viewport.SelectActors(selActors.ToArray());
            }, "添加对象");

            if (mPreviewActor == null || mPreviewActor.mPreviewActor == null)
            {
                return;
            }

            await mPreviewActor.AwaitLoad();

            viewport.World.RemoveEditorActor(mPreviewActor.mPreviewActor.ActorId);

            //if (mPreviewActor.mPreviewActor.Children.Count > 0)
            //{
            //    for (int i = mPreviewActor.mPreviewActor.Children.Count - 1; i >= 0; i --)
            //    {
            //        EngineNS.GamePlay.Actor.GActor actor = mPreviewActor.mPreviewActor.Children[i];
            //        actor.Parent.SetParent(null);
            //        viewport.World.RemoveActor(actor.ActorId);
            //        viewport.World.DefaultScene.RemoveActor(actor.ActorId);
            //    }
            //}
        }