// 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. // @dart = 2.8 import 'package:flutter/widgets.dart'; /// The Flutter logo, in widget form. This widget respects the [IconTheme]. /// For guidelines on using the Flutter logo, visit https://flutter.dev/brand. /// /// See also: /// /// * [IconTheme], which provides ambient configuration for icons. /// * [Icon], for showing icons the Material design icon library. /// * [ImageIcon], for showing icons from [AssetImage]s or other [ImageProvider]s. class FlutterLogo extends StatelessWidget { /// Creates a widget that paints the Flutter logo. /// /// The [size] defaults to the value given by the current [IconTheme]. /// /// The [textColor], [style], [duration], and [curve] arguments must not be /// null. const FlutterLogo({ Key key, this.size, this.textColor = const Color(0xFF757575), this.style = FlutterLogoStyle.markOnly, this.duration = const Duration(milliseconds: 750), this.curve = Curves.fastOutSlowIn, }) : assert(textColor != null), assert(style != null), assert(duration != null), assert(curve != null), super(key: key); /// The size of the logo in logical pixels. /// /// The logo will be fit into a square this size. /// /// Defaults to the current [IconTheme] size, if any. If there is no /// [IconTheme], or it does not specify an explicit size, then it defaults to /// 24.0. final double size; /// The color used to paint the "Flutter" text on the logo, if [style] is /// [FlutterLogoStyle.horizontal] or [FlutterLogoStyle.stacked]. /// /// If possible, the default (a medium grey) should be used against a white /// background. final Color textColor; /// Whether and where to draw the "Flutter" text. By default, only the logo /// itself is drawn. final FlutterLogoStyle style; /// The length of time for the animation if the [style] or [textColor] /// properties are changed. final Duration duration; /// The curve for the logo animation if the [style] or [textColor] change. final Curve curve; @override Widget build(BuildContext context) { final IconThemeData iconTheme = IconTheme.of(context); final double iconSize = size ?? iconTheme.size; return AnimatedContainer( width: iconSize, height: iconSize, duration: duration, curve: curve, decoration: FlutterLogoDecoration( style: style, textColor: textColor, ), ); } }