summaryrefslogtreecommitdiff
path: root/Xamarin.Forms.Core.UnitTests/DynamicBindingContextTests.cs
blob: 53618909ae6a64a0dbfb7e9b2902360bad5c0745 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using NUnit.Framework;

namespace Xamarin.Forms.Core.UnitTests
{
	[TestFixture]
	public class DynamicBindingContextTests
	{
		[Test]
		public void BindingTwoWayToDynamicModel ()
		{
			var view = new MockBindable ();
			var model = new DynamicModel
			{
				Properties =
				{
					{ "Title", "Foo" },
				}
			};

			view.SetBinding (MockBindable.TextProperty, "Title");
			view.BindingContext = model;

			Assert.AreEqual ("Foo", view.Text);

			view.Text = "Bar";

			Assert.AreEqual ("Bar", model.Properties["Title"]);
		}

		// This whole class and inner types is just a very simple 
		// dictionary-based dynamic model that proves that the 
		// approach works. It implements just the bare minimum of 
		// the base types to get our bindings to work properly and 
		// pass the tests.
		class DynamicModel : IReflectableType
		{
			public DynamicModel ()
			{
				Properties = new Dictionary<string, object> ();
			}

			public TypeInfo GetTypeInfo ()
			{
				return new DynamicTypeInfo (Properties);
			}

			public IDictionary<string, object> Properties { get; private set; }

			class DynamicTypeInfo : TypeDelegator
			{
				IDictionary<string, object> properties;

				public DynamicTypeInfo (IDictionary<string, object> properties)
					: base (typeof(object))
				{
					this.properties = properties;
				}

				public override PropertyInfo GetDeclaredProperty (string name)
				{
					if (!properties.ContainsKey (name))
						return null;

					return new DynamicPropertyInfo (properties, name);
				}

				internal class DynamicPropertyInfo : PropertyInfo
				{
					IDictionary<string, object> properties;
					string name;

					public DynamicPropertyInfo (IDictionary<string, object> properties, string name)
					{
						this.properties = properties;
						this.name = name;
					}

					public override bool CanRead
					{
						get { return true; }
					}

					public override bool CanWrite
					{
						get { return true; }
					}

					public override MethodInfo GetGetMethod (bool nonPublic)
					{
						return new DynamicPropertyGetterInfo (this, properties);
					}

					public override MethodInfo GetSetMethod (bool nonPublic)
					{
						return new DynamicPropertySetterInfo (this, properties);
					}

					public override Type PropertyType
					{
						get { return properties[name].GetType (); }
					}

					public override string Name
					{
						get { return name; }
					}

					public override PropertyAttributes Attributes
					{
						get { return PropertyAttributes.None; }
					}

					public override MethodInfo[] GetAccessors (bool nonPublic)
					{
						return new[] { GetGetMethod (nonPublic), GetSetMethod (nonPublic) };
					}

					public override ParameterInfo[] GetIndexParameters ()
					{
						return new ParameterInfo[0];
					}

					public override object GetValue (object obj, BindingFlags invokeAttr, Binder binder, object[] index, System.Globalization.CultureInfo culture)
					{
						throw new NotImplementedException ();
					}

					public override void SetValue (object obj, object value, BindingFlags invokeAttr, Binder binder, object[] index, System.Globalization.CultureInfo culture)
					{
						throw new NotImplementedException ();
					}

					public override Type DeclaringType
					{
						get { throw new NotImplementedException (); }
					}

					public override object[] GetCustomAttributes (Type attributeType, bool inherit)
					{
						throw new NotImplementedException ();
					}

					public override object[] GetCustomAttributes (bool inherit)
					{
						throw new NotImplementedException ();
					}

					public override bool IsDefined (Type attributeType, bool inherit)
					{
						throw new NotImplementedException ();
					}

					public override Type ReflectedType
					{
						get { throw new NotImplementedException (); }
					}
				}

				internal class DynamicPropertyGetterInfo : DynamicPropertyMethodInfo
				{
					public DynamicPropertyGetterInfo (PropertyInfo property, IDictionary<string, object> properties)
						: base (property, properties)
					{
					}

					public override object Invoke (object obj, BindingFlags invokeAttr, Binder binder, object[] parameters, CultureInfo culture)
					{
						return Properties[Property.Name];
					}

					public override ParameterInfo[] GetParameters ()
					{
						return new[] { new DynamicParameterInfo (Property, Property.PropertyType, "value") };
					}

					public override Type ReturnType
					{
						get { return Property.PropertyType; }
					}
				}

				internal class DynamicPropertySetterInfo : DynamicPropertyMethodInfo
				{
					public DynamicPropertySetterInfo (PropertyInfo property, IDictionary<string, object> properties)
						: base (property, properties)
					{
					}

					public override object Invoke (object obj, BindingFlags invokeAttr, Binder binder, object[] parameters, CultureInfo culture)
					{
						Properties[Property.Name] = parameters[0];
						return null;
					}

					public override ParameterInfo[] GetParameters ()
					{
						return new[] {
							new DynamicParameterInfo (Property, typeof(DynamicTypeInfo), "this"),
							new DynamicParameterInfo (Property, Property.PropertyType, "value")
						};
					}

					public override Type ReturnType
					{
						get { return typeof(void); }
					}
				}

				internal abstract class DynamicPropertyMethodInfo : MethodInfo
				{
					public DynamicPropertyMethodInfo (PropertyInfo property, IDictionary<string, object> properties)
					{
						Property = property;
						Properties = properties;
					}

					protected PropertyInfo Property { get; private set; }

					protected IDictionary<string, object> Properties { get; private set; }

					public override MethodInfo GetBaseDefinition ()
					{
						return null;
					}

					public override ICustomAttributeProvider ReturnTypeCustomAttributes
					{
						get { return null; }
					}

					public override MethodAttributes Attributes
					{
						get { return MethodAttributes.Public; }
					}

					public override MethodImplAttributes GetMethodImplementationFlags ()
					{
						return MethodImplAttributes.IL;
					}

					public override ParameterInfo[] GetParameters ()
					{
						return new ParameterInfo[0];
					}

					public override RuntimeMethodHandle MethodHandle
					{
						get { throw new NotImplementedException (); }
					}

					public override Type DeclaringType
					{
						get { return typeof(DynamicModel); }
					}

					public override object[] GetCustomAttributes (Type attributeType, bool inherit)
					{
						return new object[0];
					}

					public override object[] GetCustomAttributes (bool inherit)
					{
						return new object[0];
					}

					public override bool IsDefined (Type attributeType, bool inherit)
					{
						return false;
					}

					public override string Name
					{
						get { return Property.Name; }
					}

					public override Type ReflectedType
					{
						get { return typeof(DynamicModel); }
					}
				}

				internal class DynamicParameterInfo : ParameterInfo
				{
					MemberInfo member;
					Type type;

					public DynamicParameterInfo (MemberInfo member, Type type, string name)
					{
						this.member = member;
						this.type = type;
					}

					public override MemberInfo Member
					{
						get { return member; }
					}

					public override Type ParameterType
					{
						get { return type; }
					}
				}
			}

		}
	}
}