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

   1 using System;
   2 using System.Xml;
   3 using System.Reflection;
   4 using System.Linq;
   5 using Tizen.NUI.Binding;
   6
   7
   8 namespace Tizen.NUI.Xaml
   9 {
  10     [ContentProperty("Key")]
  11     internal sealed class StaticResourceExtension : IMarkupExtension
  12     {
  13         public string Key { get; set; }
  14
  15         public object ProvideValue(IServiceProvider serviceProvider)
  16         {
  17             if (serviceProvider == null)
  18                 throw new ArgumentNullException(nameof(serviceProvider));
  19             if (Key == null) {
  20                 var lineInfoProvider = serviceProvider.GetService(typeof(IXmlLineInfoProvider)) as IXmlLineInfoProvider;
  21                 var lineInfo = (lineInfoProvider != null) ? lineInfoProvider.XmlLineInfo : new XmlLineInfo();
  22                 throw new XamlParseException("you must specify a key in {StaticResource}", lineInfo);
  23             }
  24             var valueProvider = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideParentValues;
  25             if (valueProvider == null)
  26                 throw new ArgumentException();
  27             var xmlLineInfoProvider = serviceProvider.GetService(typeof(IXmlLineInfoProvider)) as IXmlLineInfoProvider;
  28             var xmlLineInfo = xmlLineInfoProvider != null ? xmlLineInfoProvider.XmlLineInfo : null;
  29             object resource = null;
  30
  31             foreach (var p in valueProvider.ParentObjects) {
  32                 var irp = p as IResourcesProvider;
  33                 var resDict = irp != null && irp.IsResourcesCreated ? irp.XamlResources : p as ResourceDictionary;
  34                 if (resDict == null)
  35                     continue;
  36                 if (resDict.TryGetValue(Key, out resource))
  37                     break;
  38             }
  39             resource = resource ?? GetApplicationLevelResource(Key, xmlLineInfo);
  40
  41             var bp = valueProvider.TargetProperty as BindableProperty;
  42             var pi = valueProvider.TargetProperty as PropertyInfo;
  43             var propertyType = bp?.ReturnType ?? pi?.PropertyType;
  44             if (propertyType == null) {
  45                 if (resource != null) {
  46                     if (resource.GetType().GetTypeInfo().IsGenericType && (resource.GetType().GetGenericTypeDefinition() == typeof(OnPlatform<>) || resource.GetType().GetGenericTypeDefinition() == typeof(OnIdiom<>))) {
  47                         // This is only there to support our backward compat story with pre 2.3.3 compiled Xaml project who was not providing TargetProperty
  48                         var method = resource.GetType().GetRuntimeMethod("op_Implicit", new[] { resource.GetType() });
  49                         resource = method.Invoke(null, new[] { resource });
  50                     }
  51                 }
  52                 return resource;
  53             }
  54             if (propertyType.IsAssignableFrom(resource?.GetType()))
  55                 return resource;
  56             var implicit_op =  resource?.GetType().GetImplicitConversionOperator(fromType: resource?.GetType(), toType: propertyType)
  57                             ?? propertyType.GetImplicitConversionOperator(fromType: resource?.GetType(), toType: propertyType);
  58             if (implicit_op != null)
  59                 return implicit_op.Invoke(resource, new [] { resource });
  60
  61             if (resource != null) {
  62                 //Special case for https://bugzilla.xamarin.com/show_bug.cgi?id=59818
  63                 //On OnPlatform, check for an opImplicit from the targetType
  64                 if (   Device.Flags != null
  65                     && Device.Flags.Contains("xamlDoubleImplicitOpHack")
  66                     && resource.GetType().GetTypeInfo().IsGenericType
  67                     && (resource.GetType().GetGenericTypeDefinition() == typeof(OnPlatform<>))) {
  68                     var tType = resource.GetType().GenericTypeArguments[0];
  69                     var opImplicit = tType.GetImplicitConversionOperator(fromType: tType, toType: propertyType)
  70                                     ?? propertyType.GetImplicitConversionOperator(fromType: tType, toType: propertyType);
  71
  72                     if (opImplicit != null) {
  73                         //convert the OnPlatform<T> to T
  74                         var opPlatformImplicitConversionOperator = resource?.GetType().GetImplicitConversionOperator(fromType: resource?.GetType(), toType: tType);
  75                         resource = opPlatformImplicitConversionOperator?.Invoke(null, new[] { resource });
  76
  77                         //and convert to toType
  78                         resource = opImplicit.Invoke(null, new[] { resource });
  79                         return resource;
  80                     }
  81                 }
  82             }
  83             return resource;
  84         }
  85
  86         internal object GetApplicationLevelResource(string key, IXmlLineInfo xmlLineInfo)
  87         {
  88             object resource = null;
  89             if (Application.Current == null || !((IResourcesProvider)Application.Current).IsResourcesCreated || !Application.Current.XamlResources.TryGetValue(Key, out resource))
  90                 throw new XamlParseException($"StaticResource not found for key {Key}", xmlLineInfo);
  91             return resource;
  92         }
  93     }
  94 }