public void OnLevelChanged()
        {
            LayerList.BeginUpdate();
            LayerList.Clear();
            string active_layer = Program.engine.MainLevel.GetActiveLayer();

            for (int i = 0; i < Program.engine.MainLevel.GetLayerCount(); ++i)
            {
                string            text = Program.engine.MainLevel.GetLayerName(i);
                EXListViewItem    item = new EXImageListViewItem(NexusEditor.Properties.Resources.layer);
                EXListViewSubItem name = new EXListViewSubItem(text);
                name.OnItemValueChanged = this.OnLayerNameChanged; name.UserData = item;
                item.AddSubItem(name);
                EXBoolListViewSubItem active = new EXBoolListViewSubItem(active_layer == text);
                active.OnItemValueChanged = this.OnActiveLayer; active.UserData = item;
                item.AddSubItem(active);
                EXBoolListViewSubItem show = new EXBoolListViewSubItem(Program.engine.MainLevel.IsLayerVisible(text));
                show.OnItemValueChanged = this.OnShowLayer; show.UserData = item;
                item.AddSubItem(show);
                EXBoolListViewSubItem islock = new EXBoolListViewSubItem(Program.engine.MainLevel.IsLayerLocked(text));
                islock.OnItemValueChanged = this.OnLockLayer; islock.UserData = item;
                item.AddSubItem(islock);
                LayerList.AddItem(item);
            }
            LayerList.EndUpdate();
            //在右侧的列表中显示当前激活层中的所有actor
            UpdateActorList(Program.engine.MainLevel.GetActiveLayer());
            OperationTooltip.Text = "就绪";
        }
        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            //添加新层
            //确定可用的默认层名称
            string text;

            for (int i = 1;; ++i)
            {
                text = "新作业层" + i.ToString();
                if (!Program.engine.MainLevel.IsLayerExist(text))
                {
                    break;
                }
            }

            EXListViewItem    item = new EXImageListViewItem(NexusEditor.Properties.Resources.layer);
            EXListViewSubItem name = new EXListViewSubItem(text);

            name.OnItemValueChanged = this.OnLayerNameChanged; name.UserData = item;
            item.AddSubItem(name);
            EXBoolListViewSubItem active = new EXBoolListViewSubItem(false);

            active.OnItemValueChanged = this.OnActiveLayer; active.UserData = item;
            item.AddSubItem(active);
            EXBoolListViewSubItem show = new EXBoolListViewSubItem(true);

            show.OnItemValueChanged = this.OnShowLayer; show.UserData = item;
            item.AddSubItem(show);
            EXBoolListViewSubItem islock = new EXBoolListViewSubItem(true);

            islock.OnItemValueChanged = this.OnLockLayer; islock.UserData = item;
            item.AddSubItem(islock);
            LayerList.AddItem(item);
            // 在编辑器中对应的增加一层
            Program.engine.MainLevel.CreateNewLayer(text);
            OperationTooltip.Text = "就绪";
        }