upgrade

Assets/CoolapeFrame/Scripts/ui/NguiExtend/CLUILoopGrid.cs

@@ -70,8 +70,9 @@ namespace Coolape
 						}
 						if (panel != null) {
 							oldClipOffset = panel.clipOffset;
+							panel.cullWhileDragging = true;
+							panel.onClipMove = OnMove;
 						}
-						panel.cullWhileDragging = true;
 					}
 				}
 				return _scrollView;
@@ -445,6 +446,10 @@ namespace Coolape
 
 				isCanCallOnEndList = true;
 				isCanCallOnHeadList = true;
+				if(list.Count == 0)
+                {
+					ExecuteOnShowHeadList();
+                }
 			} catch (System.Exception e) {
 				Debug.LogError (e);
 			}
@@ -575,6 +580,27 @@ namespace Coolape
 				}
 			}
 		}
+
+		protected virtual void OnMove(UIPanel panel)
+		{
+			if (scrollView == null) return;
+			bool restrictWithinPanel = false;
+			if (list == null || list.Count == 0)
+            {
+				restrictWithinPanel = true;
+			}
+
+			if (!restrictWithinPanel && firstVislable && int.Parse(head.name) == 0)
+			{
+				restrictWithinPanel = true;
+			}
+			if (!restrictWithinPanel && lastVisiable && int.Parse(tail.name) == list.Count - 1)
+			{
+				restrictWithinPanel = true;
+			}
+			scrollView.restrictWithinPanel = restrictWithinPanel;
+		}
+
 		// 从原顺序位置移动到指定位置
 		void moveCellPos (UIWidget moved, UIWidget target, int newIdx, int targetIdx)
 		{