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4467a268ce
Also, introduce Colors and Typography to hold the material colors and the typography declarations. Previously we expected clients of these libraries to import them into a namespace, but that doesn't play nice with re-exporting them from material.dart.
104 lines
3.0 KiB
Dart
104 lines
3.0 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:sky/material.dart';
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import 'package:sky/widgets.dart';
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class CardModel {
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CardModel(this.value, this.height, this.color);
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int value;
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double height;
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Color color;
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String get label => "Card $value";
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Key get key => new ObjectKey(this);
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}
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class EnsureVisibleApp extends App {
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static const TextStyle cardLabelStyle =
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const TextStyle(color: Colors.white, fontSize: 18.0, fontWeight: bold);
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static const TextStyle selectedCardLabelStyle =
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const TextStyle(color: Colors.white, fontSize: 24.0, fontWeight: bold);
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List<CardModel> cardModels;
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MixedViewportLayoutState layoutState = new MixedViewportLayoutState();
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CardModel selectedCardModel;
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void initState() {
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List<double> cardHeights = <double>[
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48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
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48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0,
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48.0, 63.0, 82.0, 146.0, 60.0, 55.0, 84.0, 96.0, 50.0
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];
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cardModels = new List.generate(cardHeights.length, (i) {
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Color color = Color.lerp(Colors.red[300], Colors.blue[900], i / cardHeights.length);
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return new CardModel(i, cardHeights[i], color);
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});
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super.initState();
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}
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void handleTap(Widget card, CardModel cardModel) {
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ensureWidgetIsVisible(card, duration: const Duration(milliseconds: 200))
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.then((_) {
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setState(() { selectedCardModel = cardModel; });
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});
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}
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Widget builder(int index) {
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if (index >= cardModels.length)
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return null;
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CardModel cardModel = cardModels[index];
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TextStyle style = (cardModel == selectedCardModel) ? selectedCardLabelStyle : cardLabelStyle;
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Widget card = new Card(
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color: cardModel.color,
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child: new Container(
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height: cardModel.height,
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padding: const EdgeDims.all(8.0),
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child: new Center(child: new Text(cardModel.label, style: style))
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)
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);
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return new GestureDetector(
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key: cardModel.key,
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onTap: () => handleTap(card, cardModel),
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child: card
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);
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}
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Widget build() {
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Widget cardCollection = new Container(
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padding: const EdgeDims.symmetric(vertical: 12.0, horizontal: 8.0),
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decoration: new BoxDecoration(backgroundColor: Theme.of(this).primarySwatch[50]),
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child: new ScrollableMixedWidgetList(
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builder: builder,
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token: cardModels.length,
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layoutState: layoutState
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)
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);
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return new IconTheme(
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data: const IconThemeData(color: IconThemeColor.white),
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child: new Theme(
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data: new ThemeData(
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brightness: ThemeBrightness.light,
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primarySwatch: Colors.blue,
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accentColor: Colors.redAccent[200]
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),
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child: new Title(
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title: 'Cards',
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child: new Scaffold(
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toolbar: new ToolBar(center: new Text('Tap a Card')),
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body: cardCollection
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)
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)
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)
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);
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}
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}
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void main() {
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runApp(new EnsureVisibleApp());
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}
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