画板基础基本完成

AIStudio.Wpf.DiagramDesigner/UserControls/TextControl.xaml.cs

@@ -107,7 +107,27 @@ namespace AIStudio.Wpf.DiagramDesigner
                     }
                 }                
             }
-        }      
+        }
+
+        protected override void OnPreviewKeyDown(KeyEventArgs e)
+        {
+            if (AcceptsReturn == false && e.Key == Key.Enter)
+            {
+                if (this.DataContext is DesignerItemViewModelBase designitem)
+                {
+                    designitem.ExitEditCommand.Execute(null);
+                }
+            }
+            base.OnPreviewKeyDown(e);          
+        }
+
+        protected override void OnLostFocus(RoutedEventArgs e)
+        {
+            if (this.DataContext is ISelectable selectable)
+            {
+                selectable.IsSelected = false;
+            }
+        }
     }
 
     public class ControlAttachProperty