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// 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/widgets.dart';
import 'button_theme.dart';
import 'dialog.dart';
import 'flat_button.dart';
import 'raised_button.dart';
/// A horizontal arrangement of buttons.
/// Places the buttons horizontally according to the padding in the current
/// [ButtonTheme].
/// Used by [Dialog] to arrange the actions at the bottom of the dialog.
/// See also:
/// * [RaisedButton], a kind of button.
/// * [FlatButton], another kind of button.
/// * [Card], at the bottom of which it is common to place a [ButtonBar].
/// * [Dialog], which uses a [ButtonBar] for its actions.
/// * [ButtonTheme], which configures the [ButtonBar].
class ButtonBar extends StatelessWidget {
/// Creates a button bar.
/// The alignment argument defaults to [MainAxisAlignment.end].
const ButtonBar({
Key key,
this.alignment = MainAxisAlignment.end,
this.mainAxisSize = MainAxisSize.max,
this.children = const <Widget>[],
}) : super(key: key);
/// How the children should be placed along the horizontal axis.
final MainAxisAlignment alignment;
/// How much horizontal space is available. See [Row.mainAxisSize].
final MainAxisSize mainAxisSize;
/// The buttons to arrange horizontally.
/// Typically [RaisedButton] or [FlatButton] widgets.
final List<Widget> children;
Widget build(BuildContext context) {
// We divide by 4.0 because we want half of the average of the left and right padding.
final double paddingUnit = ButtonTheme.of(context).padding.horizontal / 4.0;
return new Padding(
padding: new EdgeInsets.symmetric(
vertical: 2.0 * paddingUnit,
horizontal: paddingUnit
child: new Row(
mainAxisAlignment: alignment,
mainAxisSize: mainAxisSize,
children:<Widget>((Widget child) {
return new Padding(
padding: new EdgeInsets.symmetric(horizontal: paddingUnit),
child: child