src/Tizen.NUI/src/internal/Xaml/NamescopingVisitor.cs

   1 using System.Collections.Generic;
   2 using Tizen.NUI.Internals;
   3
   4 namespace Tizen.NUI.Xaml
   5 {
   6         internal class NamescopingVisitor : IXamlNodeVisitor
   7         {
   8                 readonly Dictionary<INode, INameScope> scopes = new Dictionary<INode, INameScope>();
   9
  10                 public NamescopingVisitor(HydrationContext context)
  11                 {
  12                         Values = context.Values;
  13                 }
  14
  15                 Dictionary<INode, object> Values { get; set; }
  16
  17                 public TreeVisitingMode VisitingMode => TreeVisitingMode.TopDown;
  18                 public bool StopOnDataTemplate => false;
  19                 public bool StopOnResourceDictionary => false;
  20                 public bool VisitNodeOnDataTemplate => true;
  21                 public bool SkipChildren(INode node, INode parentNode) => false;
  22
  23                 public void Visit(ValueNode node, INode parentNode)
  24                 {
  25                         scopes[node] = scopes[parentNode];
  26                 }
  27
  28                 public void Visit(MarkupNode node, INode parentNode)
  29                 {
  30                         scopes[node] = scopes[parentNode];
  31                 }
  32
  33                 public void Visit(ElementNode node, INode parentNode)
  34                 {
  35                         var ns = parentNode == null || IsDataTemplate(node, parentNode) || IsStyle(node, parentNode) || IsVisualStateGroupList(node)
  36                                 ? new NameScope()
  37                                 : scopes[parentNode];
  38                         node.Namescope = ns;
  39                         scopes[node] = ns;
  40                 }
  41
  42                 public void Visit(RootNode node, INode parentNode)
  43                 {
  44                         var ns = new NameScope();
  45                         node.Namescope = ns;
  46                         scopes[node] = ns;
  47                 }
  48
  49                 public void Visit(ListNode node, INode parentNode)
  50                 {
  51                         scopes[node] = scopes[parentNode];
  52                 }
  53
  54                 static bool IsDataTemplate(INode node, INode parentNode)
  55                 {
  56                         var parentElement = parentNode as IElementNode;
  57                         INode createContent;
  58                         if (parentElement != null && parentElement.Properties.TryGetValue(XmlName._CreateContent, out createContent) &&
  59                             createContent == node)
  60                                 return true;
  61                         return false;
  62                 }
  63
  64                 static bool IsStyle(INode node, INode parentNode)
  65                 {
  66                         var pnode = parentNode as ElementNode;
  67                         return pnode != null && pnode.XmlType.Name == "Style";
  68                 }
  69
  70                 static bool IsVisualStateGroupList(ElementNode node)
  71                 {
  72                         return node != null  && node.XmlType.Name == "VisualStateGroup" && node.Parent is IListNode;
  73                 }
  74         }
  75 }