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| 1 | +using System; |
| 2 | +using System.Runtime.InteropServices; |
| 3 | + |
| 4 | +namespace Noesis |
| 5 | +{ |
| 6 | + /// <summary> |
| 7 | + /// Represents a service that reports situational object-property relationships for markup extension evaluation. |
| 8 | + /// </summary> |
| 9 | + public interface IProvideValueTarget |
| 10 | + { |
| 11 | + /// <summary> |
| 12 | + /// Gets the target object being reported. |
| 13 | + /// </summary> |
| 14 | + object TargetObject { get; } |
| 15 | + |
| 16 | + /// <summary> |
| 17 | + /// Gets an identifier for the target property being reported. |
| 18 | + /// </summary> |
| 19 | + object TargetProperty { get; } |
| 20 | + } |
| 21 | + |
| 22 | + /// <summary> |
| 23 | + /// Represents a service that can use application context to resolve a provided relative URI to an absolute URI. |
| 24 | + /// </summary> |
| 25 | + public interface IUriContext |
| 26 | + { |
| 27 | + /// <summary> |
| 28 | + /// Gets or sets the base URI of the current application context. |
| 29 | + /// </summary> |
| 30 | + Uri BaseUri { get; } |
| 31 | + } |
| 32 | + |
| 33 | + /// <summary> |
| 34 | + /// Represents a service that resolves from named elements in XAML markup to the appropriate type. |
| 35 | + /// </summary> |
| 36 | + public interface IXamlTypeResolver |
| 37 | + { |
| 38 | + /// <summary> |
| 39 | + /// Resolves a named XAML type to the corresponding Type. The type name is optionally qualified |
| 40 | + /// by the prefix for a XML namespace, otherwise the current default XML namespace is assumed. |
| 41 | + /// </summary> |
| 42 | + Type Resolve(string qualifiedTypeName); |
| 43 | + } |
| 44 | + |
| 45 | + /// <summary> |
| 46 | + /// Describes a service that can return a XAML namespace that is based on its prefix as it is mapped in XAML markup. |
| 47 | + /// </summary> |
| 48 | + public interface IXamlNamespaceResolver |
| 49 | + { |
| 50 | + /// <summary> |
| 51 | + /// Retrieves a XAML namespace identifier for the specified prefix string. |
| 52 | + /// </summary> |
| 53 | + string GetNamespace(string prefix); |
| 54 | + } |
| 55 | + |
| 56 | + /// <summary> |
| 57 | + /// Describes a service that can return objects that are specified by XAML name, or alternatively, returns a token that defers name resolution. The service can also return an enumerable set of all named objects that are in the XAML namescope. |
| 58 | + /// </summary> |
| 59 | + public interface IXamlNameResolver |
| 60 | + { |
| 61 | + /// <summary> |
| 62 | + /// Resolves an object from a name reference. |
| 63 | + /// </summary> |
| 64 | + object Resolve(string name); |
| 65 | + } |
| 66 | + |
| 67 | + /// <summary> |
| 68 | + /// Implementation of XAML service providers available for MarkupExtensions |
| 69 | + /// </summary> |
| 70 | + internal class MarkupExtensionProvider : IServiceProvider, IProvideValueTarget, IUriContext, IXamlTypeResolver, IXamlNamespaceResolver, IXamlNameResolver |
| 71 | + { |
| 72 | + object IServiceProvider.GetService(Type serviceType) |
| 73 | + { |
| 74 | + if (serviceType == typeof(IProvideValueTarget)) |
| 75 | + { |
| 76 | + return this; |
| 77 | + } |
| 78 | + if (serviceType == typeof(IUriContext)) |
| 79 | + { |
| 80 | + return this; |
| 81 | + } |
| 82 | + if (serviceType == typeof(IXamlTypeResolver)) |
| 83 | + { |
| 84 | + return this; |
| 85 | + } |
| 86 | + if (serviceType == typeof(IXamlNamespaceResolver)) |
| 87 | + { |
| 88 | + return this; |
| 89 | + } |
| 90 | + if (serviceType == typeof(IXamlNameResolver)) |
| 91 | + { |
| 92 | + return this; |
| 93 | + } |
| 94 | + |
| 95 | + return null; |
| 96 | + } |
| 97 | + |
| 98 | + object IProvideValueTarget.TargetObject |
| 99 | + { |
| 100 | + get |
| 101 | + { |
| 102 | + IntPtr targetPtr = MarkupExtensionProvider_TargetObject(_provider); |
| 103 | + return Extend.GetProxy(targetPtr, false); |
| 104 | + } |
| 105 | + } |
| 106 | + |
| 107 | + object IProvideValueTarget.TargetProperty |
| 108 | + { |
| 109 | + get |
| 110 | + { |
| 111 | + IntPtr propPtr = MarkupExtensionProvider_TargetProperty(_provider); |
| 112 | + return Extend.GetProxy(propPtr, false); |
| 113 | + } |
| 114 | + } |
| 115 | + |
| 116 | + Uri IUriContext.BaseUri |
| 117 | + { |
| 118 | + get |
| 119 | + { |
| 120 | + IntPtr uriPtr = MarkupExtensionProvider_BaseUri(_provider); |
| 121 | + string uri = Extend.StringFromNativeUtf8(uriPtr); |
| 122 | + NoesisGUI_PINVOKE.FreeString(uriPtr); |
| 123 | + return new Uri(uri, UriKind.Relative); |
| 124 | + } |
| 125 | + } |
| 126 | + |
| 127 | + Type IXamlTypeResolver.Resolve(string qualifiedTypeName) |
| 128 | + { |
| 129 | + IntPtr cPtr = MarkupExtensionProvider_ResolveType(_provider, qualifiedTypeName); |
| 130 | + if (cPtr != IntPtr.Zero) |
| 131 | + { |
| 132 | + Extend.NativeTypeInfo info = Extend.GetNativeTypeInfo(cPtr); |
| 133 | + return info.Type; |
| 134 | + } |
| 135 | + return null; |
| 136 | + } |
| 137 | + |
| 138 | + string IXamlNamespaceResolver.GetNamespace(string prefix) |
| 139 | + { |
| 140 | + IntPtr strPtr = MarkupExtensionProvider_GetNamespace(_provider, prefix); |
| 141 | + return Extend.StringFromNativeUtf8(strPtr); |
| 142 | + } |
| 143 | + |
| 144 | + object IXamlNameResolver.Resolve(string name) |
| 145 | + { |
| 146 | + IntPtr objectPtr = MarkupExtensionProvider_ResolveName(_provider, name); |
| 147 | + return Extend.GetProxy(objectPtr, false); |
| 148 | + } |
| 149 | + |
| 150 | + #region Private members |
| 151 | + |
| 152 | + internal MarkupExtensionProvider(IntPtr cPtr) |
| 153 | + { |
| 154 | + _provider = new HandleRef(this, cPtr); |
| 155 | + } |
| 156 | + |
| 157 | + private HandleRef _provider; |
| 158 | + |
| 159 | + [DllImport(Library.Name)] |
| 160 | + static extern IntPtr MarkupExtensionProvider_TargetObject(HandleRef provider); |
| 161 | + |
| 162 | + [DllImport(Library.Name)] |
| 163 | + static extern IntPtr MarkupExtensionProvider_TargetProperty(HandleRef provider); |
| 164 | + |
| 165 | + [DllImport(Library.Name)] |
| 166 | + static extern IntPtr MarkupExtensionProvider_BaseUri(HandleRef provider); |
| 167 | + |
| 168 | + [DllImport(Library.Name)] |
| 169 | + static extern IntPtr MarkupExtensionProvider_ResolveType(HandleRef provider, [MarshalAs(UnmanagedType.LPWStr)]string name); |
| 170 | + |
| 171 | + [DllImport(Library.Name)] |
| 172 | + static extern IntPtr MarkupExtensionProvider_GetNamespace(HandleRef provider, [MarshalAs(UnmanagedType.LPWStr)]string name); |
| 173 | + |
| 174 | + [DllImport(Library.Name)] |
| 175 | + static extern IntPtr MarkupExtensionProvider_ResolveName(HandleRef provider, [MarshalAs(UnmanagedType.LPWStr)]string name); |
| 176 | + |
| 177 | + #endregion |
| 178 | + } |
| 179 | +} |
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