examples/api/lib/widgets/media_query/media_query_data.system_gesture_insets.0.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Template: dev/snippets/config/templates/stateful_widget_material.tmpl
//
// Comment lines marked with "▼▼▼" and "▲▲▲" are used for authoring
// of samples, and may be ignored if you are just exploring the sample.

// Flutter code sample for MediaQueryData.systemGestureInsets
//
//***************************************************************************
//* ▼▼▼▼▼▼▼▼ description ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)

// For apps that might be deployed on Android Q devices with full gesture
// navigation enabled, use [systemGestureInsets] with [Padding]
// to avoid having the left and right edges of the [Slider] from appearing
// within the area reserved for system gesture navigation.
//
// By default, [Slider]s expand to fill the available width. So, we pad the
// left and right sides.

//* ▲▲▲▲▲▲▲▲ description ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
//***************************************************************************

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

/// This is the main application widget.
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: _title,
      home: MyStatefulWidget(),
    );
  }
}

/// This is the stateful widget that the main application instantiates.
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

/// This is the private State class that goes with MyStatefulWidget.
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
//********************************************************************
//* ▼▼▼▼▼▼▼▼ code ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)

  double _currentValue = 0.2;

  @override
  Widget build(BuildContext context) {
    final EdgeInsets systemGestureInsets =
        MediaQuery.of(context).systemGestureInsets;
    return Scaffold(
      appBar:
          AppBar(title: const Text('Pad Slider to avoid systemGestureInsets')),
      body: Padding(
        padding: EdgeInsets.only(
          // only left and right padding are needed here
          left: systemGestureInsets.left,
          right: systemGestureInsets.right,
        ),
        child: Slider(
          value: _currentValue,
          onChanged: (double newValue) {
            setState(() {
              _currentValue = newValue;
            });
          },
        ),
      ),
    );
  }

//* ▲▲▲▲▲▲▲▲ code ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
//********************************************************************

}