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
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/widgets.dart';
import 'states.dart';
void main() {
testWidgets('ScrollController control test', (WidgetTester tester) async {
final ScrollController controller = new ScrollController();
await tester.pumpWidget(new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(
height: 200.0,
child: new Text(state),
);
}).toList()
));
double realOffset() {
return tester.state<ScrollableState>(find.byType(Scrollable)).position.pixels;
}
expect(controller.offset, equals(0.0));
expect(realOffset(), equals(controller.offset));
controller.jumpTo(653.0);
expect(controller.offset, equals(653.0));
expect(realOffset(), equals(controller.offset));
await tester.pump();
expect(controller.offset, equals(653.0));
expect(realOffset(), equals(controller.offset));
controller.animateTo(326.0, duration: const Duration(milliseconds: 300), curve: Curves.ease);
await tester.pumpAndSettle(const Duration(milliseconds: 100));
expect(controller.offset, equals(326.0));
expect(realOffset(), equals(controller.offset));
await tester.pumpWidget(new ListView(
key: const Key('second'),
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(
height: 200.0,
child: new Text(state),
);
}).toList()
));
expect(controller.offset, equals(0.0));
expect(realOffset(), equals(controller.offset));
controller.jumpTo(653.0);
expect(controller.offset, equals(653.0));
expect(realOffset(), equals(controller.offset));
final ScrollController controller2 = new ScrollController();
await tester.pumpWidget(new ListView(
key: const Key('second'),
controller: controller2,
children: kStates.map<Widget>((String state) {
return new Container(
height: 200.0,
child: new Text(state),
);
}).toList()
));
expect(() => controller.offset, throwsAssertionError);
expect(controller2.offset, equals(653.0));
expect(realOffset(), equals(controller2.offset));
expect(() => controller.jumpTo(120.0), throwsAssertionError);
expect(() => controller.animateTo(132.0, duration: const Duration(milliseconds: 300), curve: Curves.ease), throwsAssertionError);
await tester.pumpWidget(new ListView(
key: const Key('second'),
controller: controller2,
physics: const BouncingScrollPhysics(),
children: kStates.map<Widget>((String state) {
return new Container(
height: 200.0,
child: new Text(state),
);
}).toList()
));
expect(controller2.offset, equals(653.0));
expect(realOffset(), equals(controller2.offset));
controller2.jumpTo(432.0);
expect(controller2.offset, equals(432.0));
expect(realOffset(), equals(controller2.offset));
await tester.pump();
expect(controller2.offset, equals(432.0));
expect(realOffset(), equals(controller2.offset));
});
testWidgets('ScrollController control test', (WidgetTester tester) async {
final ScrollController controller = new ScrollController(
initialScrollOffset: 209.0,
);
await tester.pumpWidget(new GridView.count(
crossAxisCount: 4,
controller: controller,
children: kStates.map<Widget>((String state) => new Text(state)).toList(),
));
double realOffset() {
return tester.state<ScrollableState>(find.byType(Scrollable)).position.pixels;
}
expect(controller.offset, equals(209.0));
expect(realOffset(), equals(controller.offset));
controller.jumpTo(105.0);
await tester.pump();
expect(controller.offset, equals(105.0));
expect(realOffset(), equals(controller.offset));
await tester.pumpWidget(new GridView.count(
crossAxisCount: 2,
controller: controller,
children: kStates.map<Widget>((String state) => new Text(state)).toList(),
));
expect(controller.offset, equals(105.0));
expect(realOffset(), equals(controller.offset));
});
testWidgets('DrivenScrollActivity ending after dispose', (WidgetTester tester) async {
final ScrollController controller = new ScrollController();
await tester.pumpWidget(new ListView(
controller: controller,
children: <Widget>[ new Container(height: 200000.0) ],
));
controller.animateTo(1000.0, duration: const Duration(seconds: 1), curve: Curves.linear);
await tester.pump(); // Start the animation.
// We will now change the tree on the same frame as the animation ends.
await tester.pumpWidget(new Container(), const Duration(seconds: 2));
});
testWidgets('Read operations on ScrollControllers with no positions fail', (WidgetTester tester) async {
final ScrollController controller = new ScrollController();
expect(() => controller.offset, throwsAssertionError);
expect(() => controller.position, throwsAssertionError);
});
testWidgets('Read operations on ScrollControllers with more than one position fail', (WidgetTester tester) async {
final ScrollController controller = new ScrollController();
await tester.pumpWidget(new ListView(
children: <Widget>[
new Container(
constraints: const BoxConstraints(maxHeight: 500.0),
child: new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
),
),
new Container(
constraints: const BoxConstraints(maxHeight: 500.0),
child: new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
),
),
],
));
expect(() => controller.offset, throwsAssertionError);
expect(() => controller.position, throwsAssertionError);
});
testWidgets('Write operations on ScrollControllers with no positions fail', (WidgetTester tester) async {
final ScrollController controller = new ScrollController();
expect(() => controller.animateTo(1.0, duration: const Duration(seconds: 1), curve: Curves.linear), throwsAssertionError);
expect(() => controller.jumpTo(1.0), throwsAssertionError);
});
testWidgets('Write operations on ScrollControllers with more than one position do not throw', (WidgetTester tester) async {
final ScrollController controller = new ScrollController();
await tester.pumpWidget(new ListView(
children: <Widget>[
new Container(
constraints: const BoxConstraints(maxHeight: 500.0),
child: new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
),
),
new Container(
constraints: const BoxConstraints(maxHeight: 500.0),
child: new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
),
),
],
));
controller.jumpTo(1.0);
controller.animateTo(1.0, duration: const Duration(seconds: 1), curve: Curves.linear);
await tester.pumpAndSettle();
});
testWidgets('Scroll controllers notify when the position changes', (WidgetTester tester) async {
final ScrollController controller = new ScrollController();
final List<double> log = <double>[];
controller.addListener(() {
log.add(controller.offset);
});
await tester.pumpWidget(new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
));
expect(log, isEmpty);
await tester.drag(find.byType(ListView), const Offset(0.0, -250.0));
expect(log, equals(<double>[ 250.0 ]));
log.clear();
controller.dispose();
await tester.drag(find.byType(ListView), const Offset(0.0, -130.0));
expect(log, isEmpty);
});
testWidgets('keepScrollOffset', (WidgetTester tester) async {
final PageStorageBucket bucket = new PageStorageBucket();
Widget buildFrame(ScrollController controller) {
return new PageStorage(
bucket: bucket,
child: new KeyedSubtree(
key: const PageStorageKey<String>('ListView'),
child: new ListView(
key: new UniqueKey(), // it's a different ListView every time
controller: controller,
children: new List<Widget>.generate(50, (int index) {
return new Container(height: 100.0, child: new Text('Item $index'));
}).toList(),
),
),
);
}
// keepScrollOffset: true (the default). The scroll offset is restored
// when the ListView is recreated with a new ScrollController.
// The initialScrollOffset is used in this case, because there's no saved
// scroll offset.
ScrollController controller = new ScrollController(initialScrollOffset: 200.0);
await tester.pumpWidget(buildFrame(controller));
expect(tester.getTopLeft(find.widgetWithText(Container, 'Item 2')), Offset.zero);
controller.jumpTo(2000.0);
await tester.pump();
expect(tester.getTopLeft(find.widgetWithText(Container, 'Item 20')), Offset.zero);
// The initialScrollOffset isn't used in this case, because the scrolloffset
// can be restored.
controller = new ScrollController(initialScrollOffset: 25.0);
await tester.pumpWidget(buildFrame(controller));
expect(controller.offset, 2000.0);
expect(tester.getTopLeft(find.widgetWithText(Container, 'Item 20')), Offset.zero);
// keepScrollOffset: false. The scroll offset is -not- restored
// when the ListView is recreated with a new ScrollController and
// the initialScrollOffset is used.
controller = new ScrollController(keepScrollOffset: false, initialScrollOffset: 100.0);
await tester.pumpWidget(buildFrame(controller));
expect(controller.offset, 100.0);
expect(tester.getTopLeft(find.widgetWithText(Container, 'Item 1')), Offset.zero);
});
}