examples/material_gallery/lib/demo/tabs_demo.dart

// 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 'widget_demo.dart';

final TabBarSelection _selection = new TabBarSelection();
final List<String> _iconNames = <String>["event", "home", "android", "alarm", "face", "language"];

Widget buildTabBar(_) {
  return new TabBar(
    selection: _selection,
    isScrollable: true,
    labels: _iconNames.map((String iconName) => new TabLabel(text: iconName, icon: "action/$iconName")).toList()
  );
}

class TabsDemo extends StatefulComponent {
  _TabsDemoState createState() => new _TabsDemoState();
}

class _TabsDemoState extends State<TabsDemo> {
  double _viewWidth = 100.0;

  void _handleSizeChanged(Size newSize) {
    setState(() {
      _viewWidth = newSize.width;
    });
  }

  Widget build(_) {
    return new SizeObserver(
      onSizeChanged: _handleSizeChanged,
      child: new TabBarView<String>(
        selection: _selection,
        items: _iconNames,
        itemExtent: _viewWidth,
        itemBuilder: (BuildContext context, String iconName, int index) {
          return new Container(
            key: new ValueKey<String>(iconName),
            padding: const EdgeDims.all(12.0),
            child: new Card(
              child: new Center(child: new Icon(icon: "action/$iconName", size:IconSize.s48))
            )
          );
        }
      )
    );
  }
}

final WidgetDemo kTabsDemo = new WidgetDemo(
  title: 'Tabs',
  routeName: '/tabs',
  tabBarBuilder: buildTabBar,
  builder: (_) => new TabsDemo()
);