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Port ensure_visible.dart to fn3.

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This concludes the fn3 port!
This commit is contained in:
Hixie 2015-10-26 12:44:23 -07:00
parent 310ce31891
commit fd842810c9
3 changed files with 126 additions and 103 deletions
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126
examples/widgets/ensure_visible.dart Normal file
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@ -0,0 +1,126 @@
// 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';
class CardModel {
CardModel(this.value, this.height, this.color);
int value;
double height;
Color color;
String get label => "Card $value";
Key get key => new ObjectKey(this);
}
typedef void TappableCardCallback(BuildContext context);
class TappableCard extends StatelessComponent {
TappableCard({ CardModel cardModel, this.selected, this.onTap })
: cardModel = cardModel, super(key: cardModel.key);
final CardModel cardModel;
final bool selected;
final TappableCardCallback onTap;
static const TextStyle cardLabelStyle = const TextStyle(
color: Colors.white,
fontSize: 18.0,
fontWeight: bold
);
static const TextStyle selectedCardLabelStyle = const TextStyle(
color: Colors.white,
fontSize: 24.0,
fontWeight: bold
);
Widget build(BuildContext context) {
return new GestureDetector(
onTap: () => onTap(context),
child: new Card(
color: cardModel.color,
child: new Container(
height: cardModel.height,
padding: const EdgeDims.all(8.0),
child: new Center(
child: new Text(
cardModel.label,
style: selected ? selectedCardLabelStyle : cardLabelStyle
)
)
)
)
);
}
}
class EnsureVisibleApp extends StatefulComponent {
EnsureVisibleAppState createState() => new EnsureVisibleAppState();
}
class EnsureVisibleAppState extends State<EnsureVisibleApp> {
List<CardModel> cardModels;
int selectedCardIndex;
void initState() {
List<double> cardHeights = <double>[
48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0
];
cardModels = new List<CardModel>.generate(cardHeights.length, (int i) {
Color color = Color.lerp(Colors.red[300], Colors.blue[900], i / cardHeights.length);
return new CardModel(i, cardHeights[i], color);
});
super.initState();
}
Widget builder(BuildContext context, int index) {
if (index >= cardModels.length)
return null;
return new TappableCard(
cardModel: cardModels[index],
selected: index == selectedCardIndex,
onTap: (BuildContext context) {
ensureWidgetIsVisible(context, duration: const Duration(milliseconds: 200))
.then((_) {
setState(() { selectedCardIndex = index; });
});
}
);
}
Widget build(BuildContext context) {
return new IconTheme(
data: const IconThemeData(color: IconThemeColor.white),
child: new Theme(
data: new ThemeData(
brightness: ThemeBrightness.light,
primarySwatch: Colors.blue,
accentColor: Colors.redAccent[200]
),
child: new Title(
title: 'Cards',
child: new Scaffold(
toolBar: new ToolBar(center: new Text('Tap a card, any card')),
body: new Container(
padding: const EdgeDims.symmetric(vertical: 12.0, horizontal: 8.0),
decoration: new BoxDecoration(backgroundColor: Theme.of(context).primarySwatch[50]),
child: new ScrollableMixedWidgetList(
builder: builder,
token: cardModels.length
)
)
)
)
)
);
}
}
void main() {
runApp(new EnsureVisibleApp());
}

102
examples/widgets/ensure_visible.dart.old
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@ -1,102 +0,0 @@
// 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';
class CardModel {
CardModel(this.value, this.height, this.color);
int value;
double height;
Color color;
String get label => "Card $value";
Key get key => new ObjectKey(this);
}
class EnsureVisibleApp extends MaterialApp {
static const TextStyle cardLabelStyle =
const TextStyle(color: Colors.white, fontSize: 18.0, fontWeight: bold);
static const TextStyle selectedCardLabelStyle =
const TextStyle(color: Colors.white, fontSize: 24.0, fontWeight: bold);
List<CardModel> cardModels;
MixedViewportLayoutState layoutState = new MixedViewportLayoutState();
CardModel selectedCardModel;
void initState() {
List<double> cardHeights = <double>[
48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0
];
cardModels = new List.generate(cardHeights.length, (i) {
Color color = Color.lerp(Colors.red[300], Colors.blue[900], i / cardHeights.length);
return new CardModel(i, cardHeights[i], color);
});
super.initState();
}
void handleTap(Widget card, CardModel cardModel) {
ensureWidgetIsVisible(card, duration: const Duration(milliseconds: 200))
.then((_) {
setState(() { selectedCardModel = cardModel; });
});
}
Widget builder(int index) {
if (index >= cardModels.length)
return null;
CardModel cardModel = cardModels[index];
TextStyle style = (cardModel == selectedCardModel) ? selectedCardLabelStyle : cardLabelStyle;
Widget card = new Card(
color: cardModel.color,
child: new Container(
height: cardModel.height,
padding: const EdgeDims.all(8.0),
child: new Center(child: new Text(cardModel.label, style: style))
)
);
return new GestureDetector(
key: cardModel.key,
onTap: () => handleTap(card, cardModel),
child: card
);
}
Widget build() {
Widget cardCollection = new Container(
padding: const EdgeDims.symmetric(vertical: 12.0, horizontal: 8.0),
decoration: new BoxDecoration(backgroundColor: Theme.of(this).primarySwatch[50]),
child: new ScrollableMixedWidgetList(
builder: builder,
token: cardModels.length,
layoutState: layoutState
)
);
return new IconTheme(
data: const IconThemeData(color: IconThemeColor.white),
child: new Theme(
data: new ThemeData(
brightness: ThemeBrightness.light,
primarySwatch: Colors.blue,
accentColor: Colors.redAccent[200]
),
child: new Title(
title: 'Cards',
child: new Scaffold(
toolBar: new ToolBar(center: new Text('Tap a Card')),
body: cardCollection
)
)
)
);
}
}
void main() {
runApp(new EnsureVisibleApp());
}

1
packages/unit/test/widget/input_test.dart
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@ -105,7 +105,6 @@ void main() {
test('Selection remains valid', () {
testWidgets((WidgetTester tester) {
GlobalKey inputKey = new GlobalKey();
String inputValue;
Widget builder() {
return new Center(