fade the layer like lock effect

[NGM_AiYo]

I make a loop To choose layer. Each time I select a layer, fade it out.

At first I changed the Transparency.  It takes too much time running program.

Next I set layer's IsLocked, but I can't see the effect.

Is there any other way to do that?

the code below is my attempt of lock.

private void PickLayer(Dictionary<string, ObjectId> data)
        {
            Document doc = Common.GetActiveWindowDoc();
            Editor ed = doc.Editor;
            Database db = doc.Database;
            
            this.Hide();

            while (true)
            {
                PromptEntityOptions peo = new PromptEntityOptions("select layer");
                PromptEntityResult per = ed.GetEntity(peo);
                if (per.Status != PromptStatus.OK)
                {
                    Common.Alert("quit");
                    break;
                }

                using (var lck = doc.LockDocument())
                {
                    using (Transaction tr = db.TransactionManager.StartTransaction())
                    {
                        Entity ent = (Entity)per.ObjectId.GetObject(OpenMode.ForRead);
                        LayerTableRecord layerTR = (LayerTableRecord)ent.LayerId.GetObject(OpenMode.ForWrite);
                        TypedValue[] typedValues = { new TypedValue((int)DxfCode.LayerName, layerTR.Name) };
                        SelectionFilter filter = new SelectionFilter(typedValues);

                        if (!data.ContainsKey(layerTR.Name))
                        {
                            layerTR.IsLocked = true;
                            //layerTR.EntityColor = 
                            layerTR.DowngradeOpen();
                            ed.Regen();

                            Common.Alert("add data：" + layerTR.Name);
                            data.Add(layerTR.Name, layerTR.Id);
                        }

                        tr.Commit();
                    }
                }
                
            }

            //
            this.Show();

            //unlock
            if (data.Any())
            {
                try
                {
                    foreach (var item in data)
                    {
                        using (Transaction tr = db.TransactionManager.StartTransaction())
                        {
                            using (var lck = doc.LockDocument())
                            {
                                LayerTableRecord layerTR = (LayerTableRecord)item.Value.GetObject(OpenMode.ForRead);
                                layerTR.UpgradeOpen();
                                layerTR.IsLocked = false;
                                layerTR.DowngradeOpen();
                                ed.Regen();
                                Common.Alert(layerTR.Name + "unlock");
                            }

                            tr.Commit();
                        }
                    }
                }
                catch(Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
        }

[Anonymous]

This may be a stupid proposal, but... What about changing the layer color (or it's entities) to a darker color?

[HJohn1]

amanero, I am not an expert by any means, but I think your idea is brilliant.  If you take a layer color and multiply its RGB values by about 1/2, you will get a similar result.  This will help me, thanks.

[HJohn1]

I should add that the value of the fade should be based on your settings for LAYLOCKFADECTL to match the effect.