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09d26302cb
Added horizontal and vertical alignment properties to Stack so that the origin of non-positioned children can be specified. Currently all of the non-positioned children just end up with their top-left at 0,0. Now, for example, you can center the children by specifying verticalAlignment: 0.5, horizontalAlignment: 0.5. Added IndexedStack which only paints the stack child specified by the index property. Since it's a Stack, it's as big as the biggest non-positioned child. This component will be essential for building mobile drop down menus. Added a (likely temporary) example that demonstrates IndexedStack.
72 lines
2.1 KiB
Dart
72 lines
2.1 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/rendering.dart';
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import 'package:sky/widgets.dart';
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class IndexedStackDemo extends StatefulComponent {
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IndexedStackDemo({ this.navigator });
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final NavigatorState navigator;
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IndexedStackDemoState createState() => new IndexedStackDemoState();
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}
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class IndexedStackDemoState extends State<IndexedStackDemo> {
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int _itemCount = 7;
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int _itemIndex = 0;
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void _handleTap() {
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setState(() {
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_itemIndex = (_itemIndex + 1) % _itemCount;
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});
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}
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List <PopupMenuItem> _buildMenu(NavigatorState navigator) {
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TextStyle style = const TextStyle(fontSize: 18.0, fontWeight: bold);
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String pad = '';
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return new List.generate(_itemCount, (int i) {
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pad += '-';
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return new PopupMenuItem(value: i, child: new Text('$pad Hello World $i $pad', style: style));
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});
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}
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Widget build(BuildContext context) {
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List <PopupMenuItem> items = _buildMenu(config.navigator);
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IndexedStack indexedStack = new IndexedStack(items, index: _itemIndex, horizontalAlignment: 0.5);
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return new Scaffold(
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toolBar: new ToolBar(center: new Text('IndexedStackDemo Demo')),
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body: new GestureDetector(
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onTap: _handleTap,
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child: new Container(
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decoration: new BoxDecoration(backgroundColor: Theme.of(context).primarySwatch[50]),
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child: new Center(
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child: new Container(
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child: indexedStack,
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padding: const EdgeDims.all(8.0),
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decoration: new BoxDecoration(border: new Border.all(color: Theme.of(context).accentColor))
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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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}
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void main() {
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runApp(new App(
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title: 'IndexedStackDemo',
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theme: 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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routes: {
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'/': (RouteArguments args) => new IndexedStackDemo(navigator: args.navigator),
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}
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));
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}
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