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e502e9c8f8
Anywhere that accepted IconData now accepts either an Icon or an ImageIcon. Places that used to take an IconData in an `icon` argument, notably IconButton and DrawerItem, now take a Widget in that slot. You can wrap the value that used to be passed in in an Icon constructor to get the same result. Icon itself now takes the icon as a positional argument, for brevity. ThemeData now has an iconTheme as well as a primaryIconTheme, the same way it has had a textTheme and primaryTextTheme for a while. IconTheme.of() always returns a value now (though that value itself may have nulls in it). It defaults to the ThemeData.iconTheme. IconThemeData.fallback() is a new method that returns an icon theme data structure with all fields filled in. IconTheme.merge() is a new constructor that takes a context and creates a widget that mixes in the new values with the inherited values. Most places that introduced an IconTheme widget now use IconTheme.merge. IconThemeData.merge and IconThemeData.copyWith act in a way analogous to the similarly-named members of TextStyle. ImageIcon is introduced. It acts like Icon but takes an ImageProvider instead of an IconData. Also: Fix the analyzer to actually check the stocks app.
119 lines
3.7 KiB
Dart
119 lines
3.7 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:flutter/material.dart';
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class _Page {
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_Page({ this.label, this.colors, this.icon });
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final String label;
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final Map<int, Color> colors;
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final IconData icon;
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TabLabel get tabLabel => new TabLabel(text: label.toUpperCase());
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Color get labelColor => colors != null ? colors[300] : Colors.grey[300];
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bool get fabDefined => colors != null && icon != null;
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Color get fabColor => colors[400];
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Icon get fabIcon => new Icon(icon);
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Key get fabKey => new ValueKey<Color>(fabColor);
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}
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const String _explanatoryText =
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"When the Scaffold's floating action button changes, the new button fades and "
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"turns into view. In this demo, changing tabs can cause the app to be rebuilt "
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"with a FloatingActionButton that the Scaffold distinguishes from the others "
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"by its key.";
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class TabsFabDemo extends StatefulWidget {
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static const String routeName = '/tabs-fab';
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@override
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_TabsFabDemoState createState() => new _TabsFabDemoState();
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}
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class _TabsFabDemoState extends State<TabsFabDemo> {
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final GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>();
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final List<_Page> pages = <_Page>[
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new _Page(label: 'Blue', colors: Colors.indigo, icon: Icons.add),
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new _Page(label: 'Eco', colors: Colors.green, icon: Icons.create),
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new _Page(label: 'No'),
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new _Page(label: 'Teal', colors: Colors.teal, icon: Icons.add),
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new _Page(label: 'Red', colors: Colors.red, icon: Icons.create),
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];
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_Page selectedPage;
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@override
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void initState() {
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super.initState();
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selectedPage = pages[0];
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}
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void _handleTabSelection(_Page page) {
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setState(() {
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selectedPage = page;
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});
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}
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void _showExplanatoryText() {
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scaffoldKey.currentState.showBottomSheet((BuildContext context) {
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return new Container(
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decoration: new BoxDecoration(
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border: new Border(top: new BorderSide(color: Theme.of(context).dividerColor))
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),
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child: new Padding(
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padding: const EdgeInsets.all(32.0),
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child: new Text(_explanatoryText, style: Theme.of(context).textTheme.subhead)
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)
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);
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});
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}
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Widget buildTabView(_Page page) {
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return new Builder(
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builder: (BuildContext context) {
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return new Container(
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key: new ValueKey<String>(page.label),
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padding: const EdgeInsets.fromLTRB(48.0, 48.0, 48.0, 96.0),
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child: new Card(
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child: new Center(
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child: new Text(page.label,
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style: new TextStyle(
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color: page.labelColor,
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fontSize: 32.0
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),
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textAlign: TextAlign.center
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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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@override
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Widget build(BuildContext context) {
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return new TabBarSelection<_Page>(
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values: pages,
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onChanged: _handleTabSelection,
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child: new Scaffold(
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key: scaffoldKey,
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appBar: new AppBar(
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title: new Text('FAB per tab'),
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bottom: new TabBar<_Page>(
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labels: new Map<_Page, TabLabel>.fromIterable(pages, value: (_Page page) => page.tabLabel)
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)
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),
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floatingActionButton: !selectedPage.fabDefined ? null : new FloatingActionButton(
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key: selectedPage.fabKey,
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tooltip: 'Show explanation',
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backgroundColor: selectedPage.fabColor,
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child: selectedPage.fabIcon,
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onPressed: _showExplanatoryText
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),
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body: new TabBarView<_Page>(children: pages.map(buildTabView).toList())
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)
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);
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}
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}
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