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
|
using System;
using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;
using System.IO;
using System.Threading.Tasks;
using System.Threading;
namespace Xamarin.Forms.Core.UnitTests
{
[TestFixture]
public class ImageTests : BaseTestFixture
{
[SetUp]
public override void Setup ()
{
base.Setup ();
Device.PlatformServices = new MockPlatformServices (getStreamAsync: GetStreamAsync);
}
[TearDown]
public override void TearDown()
{
base.TearDown ();
Device.PlatformServices = null;
}
[Test]
public void TestSizing ()
{
var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true};
var result = image.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity);
Assert.AreEqual (100, result.Request.Width);
Assert.AreEqual (20, result.Request.Height);
}
[Test]
public void TestAspectSizingWithConstrainedHeight ()
{
var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true};
var result = image.GetSizeRequest (double.PositiveInfinity, 10);
Assert.AreEqual (50, result.Request.Width);
Assert.AreEqual (10, result.Request.Height);
}
[Test]
public void TestAspectSizingWithConstrainedWidth ()
{
var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true};
var result = image.GetSizeRequest (25, double.PositiveInfinity);
Assert.AreEqual (25, result.Request.Width);
Assert.AreEqual (5, result.Request.Height);
}
[Test]
public void TestAspectFillSizingWithConstrainedHeight ()
{
var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true};
image.Aspect = Aspect.AspectFill;
var result = image.GetSizeRequest (double.PositiveInfinity, 10);
Assert.AreEqual (50, result.Request.Width);
Assert.AreEqual (10, result.Request.Height);
}
[Test]
public void TestAspectFillSizingWithConstrainedWidth ()
{
var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true};
image.Aspect = Aspect.AspectFill;
var result = image.GetSizeRequest (25, double.PositiveInfinity);
Assert.AreEqual (25, result.Request.Width);
Assert.AreEqual (5, result.Request.Height);
}
[Test]
public void TestFillSizingWithConstrainedHeight ()
{
var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true};
image.Aspect = Aspect.AspectFill;
var result = image.GetSizeRequest (double.PositiveInfinity, 10);
Assert.AreEqual (50, result.Request.Width);
Assert.AreEqual (10, result.Request.Height);
}
[Test]
public void TestFillSizingWithConstrainedWidth ()
{
var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true};
image.Aspect = Aspect.AspectFill;
var result = image.GetSizeRequest (25, double.PositiveInfinity);
Assert.AreEqual (25, result.Request.Width);
Assert.AreEqual (5, result.Request.Height);
}
[Test]
public void TestSizeChanged ()
{
var image = new Image { Source = "File0.png" };
Assert.AreEqual ("File0.png", ((FileImageSource)image.Source).File);
var preferredSizeChanged = false;
image.MeasureInvalidated += (sender, args) => preferredSizeChanged = true;
image.Source = "File1.png";
Assert.AreEqual ("File1.png", ((FileImageSource)image.Source).File);
Assert.True (preferredSizeChanged);
}
[Test]
public void TestSource ()
{
var image = new Image ();
Assert.IsNull (image.Source);
bool signaled = false;
image.PropertyChanged += (sender, e) => {
if (e.PropertyName == "Source")
signaled = true;
};
var source = ImageSource.FromFile ("File.png");
image.Source = source;
Assert.AreEqual (source, image.Source);
Assert.True (signaled);
}
[Test]
public void TestSourceDoubleSet ()
{
var image = new Image {Source = ImageSource.FromFile ("File.png")};
bool signaled = false;
image.PropertyChanged += (sender, e) => {
if (e.PropertyName == "Source")
signaled = true;
};
image.Source = image.Source;
Assert.False (signaled);
}
[Test]
public void TestFileImageSourceChanged ()
{
var source = (FileImageSource)ImageSource.FromFile ("File.png");
bool signaled = false;
source.SourceChanged += (sender, e) => {
signaled = true;
};
source.File = "Other.png";
Assert.AreEqual ("Other.png", source.File);
Assert.True (signaled);
}
[Test]
public void TestFileImageSourcePropertiesChangedTriggerResize ()
{
var source = new FileImageSource ();
var image = new Image { Source = source };
bool fired = false;
image.MeasureInvalidated += (sender, e) => fired = true;
Assert.Null (source.File);
source.File = "foo.png";
Assert.NotNull (source.File);
Assert.True (fired);
}
[Test]
public void TestStreamImageSourcePropertiesChangedTriggerResize ()
{
var source = new StreamImageSource ();
var image = new Image { Source = source };
bool fired = false;
image.MeasureInvalidated += (sender, e) => fired = true;
Assert.Null (source.Stream);
source.Stream = token => Task.FromResult<Stream> (null);
Assert.NotNull (source.Stream);
Assert.True (fired);
}
[Test]
public void TestImageSourceToNullCancelsLoading ()
{
var image = new Image ();
var mockImageRenderer = new MockImageRenderer (image);
var loader = new UriImageSource { Uri = new Uri ("http://www.public-domain-image.com/free-images/miscellaneous/big-high-border-fence.jpg") };
image.Source = loader;
Assert.IsTrue (image.IsLoading);
image.Source = null;
Assert.IsFalse (image.IsLoading);
Assert.IsTrue (cancelled);
}
static bool cancelled;
static async Task<Stream> GetStreamAsync (Uri uri, CancellationToken cancellationToken)
{
try {
await Task.Delay (5000, cancellationToken);
} catch (TaskCanceledException ex) {
cancelled = true;
throw ex;
}
if (cancellationToken.IsCancellationRequested) {
cancelled = true;
throw new TaskCanceledException ();
}
var stream = typeof(ImageTests).Assembly.GetManifestResourceStream (uri.LocalPath.Substring (1));
return stream;
}
class MockImageRenderer
{
public MockImageRenderer (Image element)
{
Element = element;
Element.PropertyChanged += ( sender, e) => {
if (e.PropertyName == nameof (Image.Source))
Load ();
};
}
public Image Element { get; set; }
public async void Load ()
{
if (initialLoad && Element.Source != null) {
initialLoad = false;
((IElementController)Element).SetValueFromRenderer (Image.IsLoadingPropertyKey, true);
await (Element.Source as UriImageSource).GetStreamAsync ();
((IElementController)Element).SetValueFromRenderer (Image.IsLoadingPropertyKey, false);
}
}
bool initialLoad = true;
}
}
}
|
