bottom

bottom

MaterialApp({ title,theme, home: Scaffold({ appBar: AppBar({ title, backgroundColor, brightness. automaticallyImplyLeading, leading, actions, bottom,…}), body,}), })

açıklama

appBar ın alt kısmında sayfalar arasında geçiş sağlamak için kullanılan tabbar(buton kümesi) oluşturur.

konum

MaterialApp({ title,theme, home: Scaffold({ appBar: AppBar({ title, backgroundColor, brightness. automaticallyImplyLeading, leading, actions, bottom,...}), body,}), })

parametreler

appBar: AppBar({
                         title:   Text()
                         backgroundColor:   Colors.red    // appbar arkaplan rengini değiştitr
                         brightness:   Brightness.dark   //  appbar karanlık mı parlak mı olacak.
                         automaticallyImplyLeading:  true , // leading in otomatik oluşturulmasını konrol eder. false ise oluşturulmaz varsayaılanı true dir.
                         leading:  Builder(builder: (BuildContext context) {
                                                  return IconButton( 
                                                                      icon: const Icon(Icons.menu), 
                                                                      onPressed: () { Scaffold.of(context).openDrawer(); }, 
                                                                      tooltip: MaterialLocalizations.of(context).openAppDrawerTooltip,
                                                                    );
                                                                  },
                                                            ),   

                                           //leading ataması yapılmamıssa flutter otomatik olarak oluşturur ve draver ile sekronize açalışır. safya gecisinde ise geri dugmesi olarak yerini alır.
                                           //false  verilirse appar içinde geri widget gizlenir. 
                                           //manuel ataması  widget oluşturucu olan Builder(builder: ) ile yapılır. sayfadaki draver ile senkronize çalışması için  sayafa context ine ihtiyac duyar.
actions: [ IconButton( icon: Icon(Icons.playlist_play), tooltip: 'Buton tipi', onPressed: _fonksiyonadi, ), IconButton( icon: Icon(Icons.playlist_add), tooltip: 'Buton tipi', onPressed: _fonksiyonadi, ), IconButton( icon: Icon(Icons.playlist_add_check), tooltip: 'Buton tipi', onPressed: _fonksiyonadi, ), ], // appBar sağında tıklanabilir widgetler grubu oluşturur. IconButtons, PopupMenuButton gibi... bottom: TabBar( controller: TabController({ initialIndex: 0, @required int length, @required TickerProvider vsync }) yada DefaultTabController({ @required length, initialIndex: 0, @required Widget child}) tabs: [ Tab(icon: Icon(Icons.directions_car)), Tab(icon: Icon(Icons.directions_transit)), Tab(icon: Icon(Icons.directions_bike)), ], ),
})

örnek uygulama

app_bar_bottom_small
 
// Copyright 2017 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 AppBarBottomSample extends StatefulWidget {
  @override
  _AppBarBottomSampleState createState() => _AppBarBottomSampleState();
}

class _AppBarBottomSampleState extends State
    with SingleTickerProviderStateMixin {
  TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(vsync: this, length: choices.length);
  }

  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }

  void _nextPage(int delta) {
    final int newIndex = _tabController.index + delta;
    if (newIndex < 0 || newIndex >= _tabController.length) return;
    _tabController.animateTo(newIndex);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('AppBar Bottom Widget'),
          leading: IconButton(
            tooltip: 'Previous choice',
            icon: const Icon(Icons.arrow_back),
            onPressed: () {
              _nextPage(-1);
            },
          ),
          actions: [
            IconButton(
              icon: const Icon(Icons.arrow_forward),
              tooltip: 'Next choice',
              onPressed: () {
                _nextPage(1);
              },
            ),
          ],
          bottom: PreferredSize(
            preferredSize: const Size.fromHeight(48.0),
            child: Theme(
              data: Theme.of(context).copyWith(accentColor: Colors.white),
              child: Container(
                height: 48.0,
                alignment: Alignment.center,
                child: TabPageSelector(controller: _tabController),
              ),
            ),
          ),
        ),
        body: TabBarView(
          controller: _tabController,
          children: choices.map((Choice choice) {
            return Padding(
              padding: const EdgeInsets.all(16.0),
              child: ChoiceCard(choice: choice),
            );
          }).toList(),
        ),
      ),
    );
  }
}

class Choice {
  const Choice({this.title, this.icon});

  final String title;
  final IconData icon;
}

const List choices = const [
  const Choice(title: 'CAR', icon: Icons.directions_car),
  const Choice(title: 'BICYCLE', icon: Icons.directions_bike),
  const Choice(title: 'BOAT', icon: Icons.directions_boat),
  const Choice(title: 'BUS', icon: Icons.directions_bus),
  const Choice(title: 'TRAIN', icon: Icons.directions_railway),
  const Choice(title: 'WALK', icon: Icons.directions_walk),
];

class ChoiceCard extends StatelessWidget {
  const ChoiceCard({Key key, this.choice}) : super(key: key);

  final Choice choice;

  @override
  Widget build(BuildContext context) {
    final TextStyle textStyle = Theme.of(context).textTheme.display1;
    return Card(
      color: Colors.white,
      child: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Icon(choice.icon, size: 128.0, color: textStyle.color),
            Text(choice.title, style: textStyle),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(AppBarBottomSample());
}

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