Merge pull request #210 from Unity-Technologies/siyaoH/1.17/grid

Siyao h/1.17/grid

com.unity.uiwidgets/Runtime/cupertino/action_Sheet.cs

                 _AlertSections.actionsSection);
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(child == _contentElement || child == _actionsElement);
             if (_contentElement == child) {
                 _contentElement = null;

com.unity.uiwidgets/Runtime/cupertino/dialog.cs

                 _AlertDialogSections.actionsSection);
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(child == _contentElement || child == _actionsElement);
             if (_contentElement == child) {
                 _contentElement = null;

com.unity.uiwidgets/Runtime/external/SplayTree.cs

 using System.Collections.Generic;
 using System.Linq;
 
-namespace Unity.UIWidgets.external {    
-    class SplayTree<TKey, TValue> : IDictionary<TKey, TValue> where TKey : IComparable<TKey> {
+namespace Unity.UIWidgets.external {
+    public class SplayTree<TKey, TValue> : IDictionary<TKey, TValue> where TKey : IComparable<TKey> {
         SplayTreeNode root;
         int count;
         int version = 0;
             if (key == null) throw new Exception("should input null");
             if (root == null) throw new Exception("root is null");
             int comp = Splay(key);
-            if (comp < 0) return root.Key;
+            if (comp > 0) return root.Key;
             SplayTreeNode node = root.LeftChild;
             if (node == null) throw new Exception("does not exist");
             while (node.RightChild != null) {
         }
         
+        public TKey firstKey() {
+            if (root == null) return default; // TODO: this is suppose to be null
+            var first = First().Value;
+            return first.Key;
+        }
+        
+        public TKey lastKey() {
+            if (root == null) return default; // TODO: this is suppose to be null
+            var last = Last().Value;
+            return last.Key;
+        }
+        
-            if (comp > 0) return root.Key;
+            if (comp < 0) return root.Key;
             SplayTreeNode node = root.LeftChild;
             if (node == null)  throw new Exception("does not exist");
             while (node.LeftChild != null) {

com.unity.uiwidgets/Runtime/material/chip.cs

             slotToChild.Values.Each((value) => { visitor(value); });
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(slotToChild.ContainsValue(child));
             D.assert(childToSlot.ContainsKey(child));
             _ChipSlot slot = childToSlot[child];

com.unity.uiwidgets/Runtime/material/input_decorator.cs

             slotToChild.Values.Each((child) => { visitor(child); });
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(slotToChild.ContainsValue(child));
             D.assert(childToSlot.ContainsKey(child));
             _DecorationSlot slot = childToSlot[child];

com.unity.uiwidgets/Runtime/material/list_tile.cs

             }
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(slotToChild.Values.Contains(child));
             D.assert(childToSlot.Keys.Contains(child));
             _ListTileSlot slot = childToSlot[child];

com.unity.uiwidgets/Runtime/widgets/binding.cs

             }
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(child == _child);
             _child = null;
             base.forgetChild(child);

com.unity.uiwidgets/Runtime/widgets/framework.cs

 
         HashSet<Element> _debugForgottenChildrenWithGlobalKey = new HashSet<Element>();
 
-        internal virtual void forgetChild(Element child) {
+        public virtual void forgetChild(Element child) {
             D.assert(() => {
                 if (child.widget.key is GlobalKey)
                     _debugForgottenChildrenWithGlobalKey.Add(child);
             }
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(child == _child);
             _child = null;
             base.forgetChild(child);
         protected RenderObjectElement(RenderObjectWidget widget) : base(widget) {
         }
 
-        public new RenderObjectWidget widget {
+        public new virtual RenderObjectWidget widget {
             get { return (RenderObjectWidget) base.widget; }
         }
 
         public LeafRenderObjectElement(LeafRenderObjectWidget widget) : base(widget) {
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(false);
             base.forgetChild(child);
         }
             }
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(child == _child);
             _child = null;
             base.forgetChild(child);
             }
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(_children.Contains(child));
             D.assert(!_forgottenChildren.Contains(child));
             _forgottenChildren.Add(child);

com.unity.uiwidgets/Runtime/widgets/layout_builder.cs

                 visitor(_child);
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(child == _child);
             _child = null;
             base.forgetChild(child);

com.unity.uiwidgets/Runtime/widgets/list_wheel_scroll_view.cs

             }
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             _childElements.Remove((int) (child.slot));
             base.forgetChild(child);
         }

com.unity.uiwidgets/Runtime/widgets/sliver.cs

             
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(child != null);
             D.assert(child.slot != null);
             D.assert(_childElements.ContainsKey((int) child.slot));

com.unity.uiwidgets/Runtime/widgets/sliver_persistent_header.cs

             });
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             D.assert(child == this.child);
             this.child = null;
             base.forgetChild(child);

com.unity.uiwidgets/Runtime/widgets/table.cs

             }
         }
 
-        internal override void forgetChild(Element child) {
+        public override void forgetChild(Element child) {
             _forgottenChildren.Add(child);
         }
     }