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

   1 using System;
   2 using System.Collections.Generic;
   3 using Tizen.NUI.Binding;
   4
   5 namespace Tizen.NUI.Xaml
   6 {
   7         class RegisterXNamesVisitor : IXamlNodeVisitor
   8         {
   9                 public RegisterXNamesVisitor(HydrationContext context)
  10                 {
  11                         Values = context.Values;
  12                 }
  13
  14                 Dictionary<INode, object> Values { get; }
  15
  16                 public TreeVisitingMode VisitingMode => TreeVisitingMode.TopDown;
  17                 public bool StopOnDataTemplate => true;
  18                 public bool StopOnResourceDictionary => false;
  19                 public bool VisitNodeOnDataTemplate => false;
  20                 public bool SkipChildren(INode node, INode parentNode) => false;
  21
  22                 public void Visit(ValueNode node, INode parentNode)
  23                 {
  24                         if (!IsXNameProperty(node, parentNode))
  25                                 return;
  26                         try
  27                         {
  28                                 ((IElementNode)parentNode).Namescope.RegisterName((string)node.Value, Values[parentNode]);
  29                         }
  30                         catch (ArgumentException ae)
  31                         {
  32                                 if (ae.ParamName != "name")
  33                                         throw ae;
  34                                 throw new XamlParseException($"An element with the name \"{(string)node.Value}\" already exists in this NameScope", node);
  35                         }
  36                         var element = Values[parentNode] as Element;
  37                         if (element != null)
  38                                 element.StyleId = element.StyleId ?? (string)node.Value;
  39                 }
  40
  41                 public void Visit(MarkupNode node, INode parentNode)
  42                 {
  43                 }
  44
  45                 public void Visit(ElementNode node, INode parentNode)
  46                 {
  47                 }
  48
  49                 public void Visit(RootNode node, INode parentNode)
  50                 {
  51                 }
  52
  53                 public void Visit(ListNode node, INode parentNode)
  54                 {
  55                 }
  56
  57                 static bool IsXNameProperty(ValueNode node, INode parentNode)
  58                 {
  59                         var parentElement = parentNode as IElementNode;
  60                         INode xNameNode;
  61                         if (parentElement != null && parentElement.Properties.TryGetValue(XmlName.xName, out xNameNode) && xNameNode == node)
  62                                 return true;
  63                         return false;
  64                 }
  65         }
  66 }