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Adding JSON example. (#1)

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Andrew Brogdon
2018-06-27 15:03:58 -07:00
committed by GitHub
parent 05319d3e8c
commit f0fe2289e6
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// Copyright 2018 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:jsonexample/utils.dart';
class SimpleObjectView extends StatelessWidget {
SimpleObjectView(dynamic obj) : simpleObject = obj;
final dynamic simpleObject;
@override
Widget build(BuildContext context) {
final localTheme = Theme.of(context).textTheme;
final boldStyle = localTheme.body1.copyWith(fontWeight: FontWeight.w600);
if (simpleObject == null) return Text('NULL', style: localTheme.body1);
return Table(
columnWidths: const {
0: IntrinsicColumnWidth(),
1: FlexColumnWidth(1.0),
},
children: [
TableRow(
children: [
Text(
'aString:',
style: boldStyle,
),
Text(
simpleObject.aString != null
? '"${simpleObject.aString}"'
: 'NULL',
style: localTheme.body1,
),
],
),
TableRow(
children: [
Text('anInt:', style: boldStyle),
Text(
simpleObject.anInt?.toString() ?? 'NULL',
style: localTheme.body1,
),
],
),
TableRow(children: [
Text('aDouble:', style: boldStyle),
Text(
simpleObject.aDouble?.toString() ?? 'NULL',
style: localTheme.body1,
),
]),
TableRow(
children: [
Text('aListOfStrings:', style: boldStyle),
Text(
prettyPrintList(
simpleObject.aListOfStrings,
),
style: localTheme.body1,
),
],
),
TableRow(
children: [
Text('aListOfInts:', style: boldStyle),
Text(
prettyPrintList(simpleObject.aListOfInts),
style: localTheme.body1,
),
],
),
TableRow(
children: [
Padding(
padding: const EdgeInsets.only(right: 8.0),
child: Text('aListOfDoubles:', style: boldStyle),
),
Text(
prettyPrintList(simpleObject.aListOfDoubles),
style: localTheme.body1,
),
],
),
],
);
}
}
class SimpleObjectViewList extends StatelessWidget {
SimpleObjectViewList(List<dynamic> objects) : simpleObjects = objects;
final List<dynamic> simpleObjects;
@override
Widget build(BuildContext context) {
final widgets = <Widget>[];
for (int i = 0; i < simpleObjects.length; i++) {
widgets.addAll([
Text(
'SimpleObject $i:',
style: Theme.of(context).textTheme.subhead,
),
const SizedBox(height: 4.0),
SimpleObjectView(simpleObjects[i]),
const SizedBox(height: 24.0),
]);
}
widgets.removeLast();
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: widgets,
);
}
}
class ComplexObjectView extends StatelessWidget {
final dynamic complexObject;
ComplexObjectView(dynamic obj) : complexObject = obj;
List<Widget> _generateSimpleObjectWidgets(Iterable<dynamic> simpleObjects) {
if (simpleObjects == null) {
return [
const Padding(
padding: const EdgeInsets.symmetric(vertical: 8.0),
child: Text('NULL'),
),
];
}
if (simpleObjects.length == 0) {
return [
const Padding(
padding: const EdgeInsets.symmetric(vertical: 4.0),
child: Text('[]'),
),
];
}
return simpleObjects
.expand((o) => [
const SizedBox(height: 4.0),
SimpleObjectView(o),
const SizedBox(height: 4.0),
])
.toList();
}
@override
Widget build(BuildContext context) {
final localTheme = Theme.of(context).textTheme;
final boldStyle = localTheme.body1.copyWith(fontWeight: FontWeight.w600);
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Table(
columnWidths: const {
0: IntrinsicColumnWidth(),
1: FlexColumnWidth(1.0),
},
children: [
TableRow(
children: [
Text('aString:', style: boldStyle),
Text(
complexObject.aString != null
? '"${complexObject.aString}"'
: 'NULL',
style: localTheme.body1),
],
),
TableRow(
children: [
Text('anInt:', style: boldStyle),
Text(complexObject.anInt?.toString() ?? 'NULL',
style: localTheme.body1),
],
),
TableRow(
children: [
Text('aDouble:', style: boldStyle),
Text(complexObject.aDouble?.toString() ?? 'NULL',
style: localTheme.body1),
],
),
TableRow(
children: [
Text('anObject:', style: boldStyle),
Container(),
],
),
],
),
Padding(
padding: const EdgeInsets.fromLTRB(24.0, 4.0, 0.0, 4.0),
child: SimpleObjectView(complexObject.anObject),
),
Table(
columnWidths: const {
0: IntrinsicColumnWidth(),
1: FlexColumnWidth(1.0),
},
children: [
TableRow(
children: [
Text('aListOfStrings:', style: boldStyle),
Text(
prettyPrintList(complexObject.aListOfStrings),
style: localTheme.body1,
),
],
),
TableRow(
children: [
Text('aListOfInts:', style: boldStyle),
Text(
prettyPrintList(complexObject.aListOfInts),
style: localTheme.body1,
),
],
),
TableRow(
children: [
Padding(
padding: const EdgeInsets.only(right: 8.0),
child: Text('aListOfDoubles:', style: boldStyle),
),
Text(
prettyPrintList(complexObject.aListOfDoubles),
style: localTheme.body1,
),
],
),
TableRow(
children: [
Text('aListOfObjects:', style: boldStyle),
Container()
],
),
],
),
Padding(
padding: const EdgeInsets.only(left: 24.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children:
_generateSimpleObjectWidgets(complexObject.aListOfObjects),
),
),
],
);
}
}
class ComplexObjectViewList extends StatelessWidget {
ComplexObjectViewList(List<dynamic> objects) : complexObjects = objects;
final List<dynamic> complexObjects;
@override
Widget build(BuildContext context) {
final widgets = <Widget>[];
for (int i = 0; i < complexObjects.length; i++) {
widgets.addAll([
Text(
'Complex Object $i:',
style: Theme.of(context).textTheme.subhead,
),
const SizedBox(height: 4.0),
ComplexObjectView(complexObjects[i]),
const SizedBox(height: 24.0),
]);
}
widgets.removeLast();
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: widgets,
);
}
}