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// 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.
import 'package:flutter/widgets.dart';
/// The Flutter logo, in widget form. This widget respects the [IconTheme].
/// For guidelines on using the Flutter logo, visit
/// {@youtube 560 315}
/// 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({
this.textColor = const Color(0xFF757575), = FlutterLogoStyle.markOnly,
this.duration = const Duration(milliseconds: 750),
this.curve = Curves.fastOutSlowIn,
}) : assert(textColor != null),
assert(style != null),
assert(duration != null),
assert(curve != null);
/// 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;
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,