src/Tizen.NUI/src/internal/Xaml/MarkupExtensions/ReferenceExtension.cs

   1 using System;
   2 using Tizen.NUI.Internals;
   3 using Tizen.NUI.Xaml.Internals;
   4 using Tizen.NUI.Binding;
   5
   6 namespace Tizen.NUI.Xaml
   7 {
   8         [ContentProperty("Name")]
   9         internal class ReferenceExtension : IMarkupExtension
  10         {
  11                 public string Name { get; set; }
  12
  13                 public object ProvideValue(IServiceProvider serviceProvider)
  14                 {
  15                         if (serviceProvider == null)
  16                                 throw new ArgumentNullException(nameof(serviceProvider));
  17                         var valueProvider = serviceProvider.GetService(typeof (IProvideValueTarget)) as IProvideParentValues;
  18                         if (valueProvider == null)
  19                                 throw new ArgumentException("serviceProvider does not provide an IProvideValueTarget");
  20                         var namescopeprovider = serviceProvider.GetService(typeof (INameScopeProvider)) as INameScopeProvider;
  21                         if (namescopeprovider != null && namescopeprovider.NameScope != null)
  22                         {
  23                                 var value = namescopeprovider.NameScope.FindByName(Name);
  24                                 if (value != null)
  25                                         return value;
  26                         }
  27
  28                         foreach (var target in valueProvider.ParentObjects)
  29                         {
  30                                 var ns = target as INameScope;
  31                                 if (ns == null)
  32                                         continue;
  33                                 var value = ns.FindByName(Name);
  34                                 if (value != null)
  35                                         return value;
  36                         }
  37
  38                         var lineInfo = (serviceProvider?.GetService(typeof(IXmlLineInfoProvider)) as IXmlLineInfoProvider)?.XmlLineInfo ?? new XmlLineInfo();
  39                         throw new XamlParseException($"Can not find the object referenced by `{Name}`", lineInfo);
  40                 }
  41         }
  42 }