// 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 'theme.dart'; /// A one logical pixel thick horizontal line, with padding on either /// side. /// /// In the material design language, this represents a divider. /// /// Dividers can be used in lists, [Drawer]s, and elsewhere to separate content /// vertically. To create a one-pixel divider between items in a list, consider /// using [ListItem.divideItems], which is optimized for this case. /// /// The box's total height is controlled by [height]. The appropriate padding is /// automatically computed from the height. /// /// See also: /// /// * [PopupMenuDivider], which is the equivalent but for popup menus. /// * [ListItem.divideItems], another approach to dividing widgets in a list. /// * <https://material.google.com/components/dividers.html> class Divider extends StatelessWidget { /// Creates a material design divider. /// /// The height must be at least 1.0 logical pixels. Divider({ Key key, this.height: 16.0, this.indent: 0.0, this.color }) : super(key: key) { assert(height >= 1.0); } /// The divider's vertical extent. /// /// The divider itself is always drawn as one logical pixel thick horizontal /// line that is centered within the height specified by this value. final double height; /// The amount of empty space to the left of the divider. final double indent; /// The color to use when painting the line. /// /// Defaults to the current theme's divider color, given by /// [ThemeData.dividerColor]. /// /// ```dart /// new Divider( /// color: Colors.deepOrange[500], /// ), /// ``` final Color color; @override Widget build(BuildContext context) { final double bottom = (height ~/ 2.0).toDouble(); return new Container( height: 0.0, margin: new EdgeInsets.only( top: height - bottom - 1.0, left: indent, bottom: bottom ), decoration: new BoxDecoration( border: new Border( bottom: new BorderSide(color: color ?? Theme.of(context).dividerColor) ) ) ); } }