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
// Copyright 2015 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/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'rendering_tester.dart';
void main() {
test('should size to render view', () {
final RenderBox root = RenderDecoratedBox(
decoration: BoxDecoration(
color: const Color(0xFF00FF00),
gradient: RadialGradient(
center: Alignment.topLeft,
radius: 1.8,
colors: <Color>[Colors.yellow[500], Colors.blue[500]],
),
boxShadow: kElevationToShadow[3],
),
);
layout(root);
expect(root.size.width, equals(800.0));
expect(root.size.height, equals(600.0));
});
test('Flex and padding', () {
final RenderBox size = RenderConstrainedBox(
additionalConstraints: const BoxConstraints().tighten(height: 100.0),
);
final RenderBox inner = RenderDecoratedBox(
decoration: const BoxDecoration(
color: Color(0xFF00FF00),
),
child: size,
);
final RenderBox padding = RenderPadding(
padding: const EdgeInsets.all(50.0),
child: inner,
);
final RenderBox flex = RenderFlex(
children: <RenderBox>[padding],
direction: Axis.vertical,
crossAxisAlignment: CrossAxisAlignment.stretch,
);
final RenderBox outer = RenderDecoratedBox(
decoration: const BoxDecoration(
color: Color(0xFF0000FF),
),
child: flex,
);
layout(outer);
expect(size.size.width, equals(700.0));
expect(size.size.height, equals(100.0));
expect(inner.size.width, equals(700.0));
expect(inner.size.height, equals(100.0));
expect(padding.size.width, equals(800.0));
expect(padding.size.height, equals(200.0));
expect(flex.size.width, equals(800.0));
expect(flex.size.height, equals(600.0));
expect(outer.size.width, equals(800.0));
expect(outer.size.height, equals(600.0));
});
test('should not have a 0 sized colored Box', () {
final RenderBox coloredBox = RenderDecoratedBox(
decoration: const BoxDecoration(),
);
expect(coloredBox, hasAGoodToStringDeep);
expect(
coloredBox.toStringDeep(minLevel: DiagnosticLevel.info),
equalsIgnoringHashCodes(
'RenderDecoratedBox#00000 NEEDS-LAYOUT NEEDS-PAINT DETACHED\n'
' parentData: MISSING\n'
' constraints: MISSING\n'
' size: MISSING\n'
' decoration: BoxDecoration:\n'
' <no decorations specified>\n'
' configuration: ImageConfiguration()\n'),
);
final RenderBox paddingBox = RenderPadding(
padding: const EdgeInsets.all(10.0),
child: coloredBox,
);
final RenderBox root = RenderDecoratedBox(
decoration: const BoxDecoration(),
child: paddingBox,
);
layout(root);
expect(coloredBox.size.width, equals(780.0));
expect(coloredBox.size.height, equals(580.0));
expect(coloredBox, hasAGoodToStringDeep);
expect(
coloredBox.toStringDeep(minLevel: DiagnosticLevel.info),
equalsIgnoringHashCodes(
'RenderDecoratedBox#00000 NEEDS-PAINT\n'
' parentData: offset=Offset(10.0, 10.0) (can use size)\n'
' constraints: BoxConstraints(w=780.0, h=580.0)\n'
' size: Size(780.0, 580.0)\n'
' decoration: BoxDecoration:\n'
' <no decorations specified>\n'
' configuration: ImageConfiguration()\n',
),
);
});
test('reparenting should clear position', () {
final RenderDecoratedBox coloredBox = RenderDecoratedBox(
decoration: const BoxDecoration(),
);
final RenderPadding paddedBox = RenderPadding(
child: coloredBox,
padding: const EdgeInsets.all(10.0),
);
layout(paddedBox);
final BoxParentData parentData = coloredBox.parentData;
expect(parentData.offset.dx, isNot(equals(0.0)));
paddedBox.child = null;
final RenderConstrainedBox constraintedBox = RenderConstrainedBox(
child: coloredBox,
additionalConstraints: const BoxConstraints(),
);
layout(constraintedBox);
expect(coloredBox.parentData?.runtimeType, ParentData);
});
test('UnconstrainedBox expands to fit children', () {
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
constrainedAxis: Axis.horizontal, // This is reset to null below.
textDirection: TextDirection.ltr,
child: RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(width: 200.0, height: 200.0),
),
alignment: Alignment.center,
);
layout(
unconstrained,
constraints: const BoxConstraints(
minWidth: 200.0,
maxWidth: 200.0,
minHeight: 200.0,
maxHeight: 200.0,
),
);
// Check that we can update the constrained axis to null.
unconstrained.constrainedAxis = null;
renderer.reassembleApplication();
expect(unconstrained.size.width, equals(200.0), reason: 'unconstrained width');
expect(unconstrained.size.height, equals(200.0), reason: 'unconstrained height');
});
test('UnconstrainedBox handles vertical overflow', () {
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
textDirection: TextDirection.ltr,
child: RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(height: 200.0),
),
alignment: Alignment.center,
);
const BoxConstraints viewport = BoxConstraints(maxHeight: 100.0, maxWidth: 100.0);
layout(unconstrained, constraints: viewport);
expect(unconstrained.getMinIntrinsicHeight(100.0), equals(200.0));
expect(unconstrained.getMaxIntrinsicHeight(100.0), equals(200.0));
expect(unconstrained.getMinIntrinsicWidth(100.0), equals(0.0));
expect(unconstrained.getMaxIntrinsicWidth(100.0), equals(0.0));
});
test('UnconstrainedBox handles horizontal overflow', () {
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
textDirection: TextDirection.ltr,
child: RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(width: 200.0),
),
alignment: Alignment.center,
);
const BoxConstraints viewport = BoxConstraints(maxHeight: 100.0, maxWidth: 100.0);
layout(unconstrained, constraints: viewport);
expect(unconstrained.getMinIntrinsicHeight(100.0), equals(0.0));
expect(unconstrained.getMaxIntrinsicHeight(100.0), equals(0.0));
expect(unconstrained.getMinIntrinsicWidth(100.0), equals(200.0));
expect(unconstrained.getMaxIntrinsicWidth(100.0), equals(200.0));
});
test('UnconstrainedBox.toStringDeep returns useful information', () {
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
textDirection: TextDirection.ltr,
alignment: Alignment.center,
);
expect(unconstrained.alignment, Alignment.center);
expect(unconstrained.textDirection, TextDirection.ltr);
expect(unconstrained, hasAGoodToStringDeep);
expect(
unconstrained.toStringDeep(minLevel: DiagnosticLevel.info),
equalsIgnoringHashCodes(
'RenderUnconstrainedBox#00000 NEEDS-LAYOUT NEEDS-PAINT DETACHED\n'
' parentData: MISSING\n'
' constraints: MISSING\n'
' size: MISSING\n'
' alignment: center\n'
' textDirection: ltr\n'),
);
});
test('UnconstrainedBox honors constrainedAxis=Axis.horizontal', () {
final RenderConstrainedBox flexible =
RenderConstrainedBox(additionalConstraints: const BoxConstraints.expand(height: 200.0));
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
constrainedAxis: Axis.horizontal,
textDirection: TextDirection.ltr,
child: RenderFlex(
direction: Axis.horizontal,
textDirection: TextDirection.ltr,
children: <RenderBox>[flexible],
),
alignment: Alignment.center,
);
final FlexParentData flexParentData = flexible.parentData;
flexParentData.flex = 1;
flexParentData.fit = FlexFit.tight;
const BoxConstraints viewport = BoxConstraints(maxWidth: 100.0);
layout(unconstrained, constraints: viewport);
expect(unconstrained.size.width, equals(100.0), reason: 'constrained width');
expect(unconstrained.size.height, equals(200.0), reason: 'unconstrained height');
});
test('UnconstrainedBox honors constrainedAxis=Axis.vertical', () {
final RenderConstrainedBox flexible =
RenderConstrainedBox(additionalConstraints: const BoxConstraints.expand(width: 200.0));
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
constrainedAxis: Axis.vertical,
textDirection: TextDirection.ltr,
child: RenderFlex(
direction: Axis.vertical,
textDirection: TextDirection.ltr,
children: <RenderBox>[flexible],
),
alignment: Alignment.center,
);
final FlexParentData flexParentData = flexible.parentData;
flexParentData.flex = 1;
flexParentData.fit = FlexFit.tight;
const BoxConstraints viewport = BoxConstraints(maxHeight: 100.0);
layout(unconstrained, constraints: viewport);
expect(unconstrained.size.width, equals(200.0), reason: 'unconstrained width');
expect(unconstrained.size.height, equals(100.0), reason: 'constrained height');
});
}