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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 'dart:math' as math;
import 'dart:ui' show lerpDouble;
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import 'button_style.dart';
import 'button_style_button.dart';
import 'color_scheme.dart';
import 'colors.dart';
import 'constants.dart';
import 'ink_ripple.dart';
import 'ink_well.dart';
import 'material_state.dart';
import 'outlined_button_theme.dart';
import 'theme.dart';
import 'theme_data.dart';
/// A Material Design "Outlined Button"; essentially a [TextButton]
/// with an outlined border.
///
/// Outlined buttons are medium-emphasis buttons. They contain actions
/// that are important, but they aren’t the primary action in an app.
///
/// An outlined button is a label [child] displayed on a (zero
/// elevation) [Material] widget. The label's [Text] and [Icon]
/// widgets are displayed in the [style]'s
/// [ButtonStyle.foregroundColor] and the outline's weight and color
/// are defined by [ButtonStyle.side]. The button reacts to touches
/// by filling with the [style]'s [ButtonStyle.overlayColor].
///
/// The outlined button's default style is defined by [defaultStyleOf].
/// The style of this outline button can be overridden with its [style]
/// parameter. The style of all text buttons in a subtree can be
/// overridden with the [OutlinedButtonTheme] and the style of all of the
/// outlined buttons in an app can be overridden with the [Theme]'s
/// [ThemeData.outlinedButtonTheme] property.
///
/// Unlike [TextButton] or [ElevatedButton], outline buttons have a
/// default [ButtonStyle.side] which defines the appearance of the
/// outline. Because the default `side` is non-null, it
/// unconditionally overrides the shape's [OutlinedBorder.side]. In
/// other words, to specify an outlined button's shape _and_ the
/// appearance of its outline, both the [ButtonStyle.shape] and
/// [ButtonStyle.side] properties must be specified.
///
/// {@tool dartpad}
/// Here is an example of a basic [OutlinedButton].
///
/// ** See code in examples/api/lib/material/outlined_button/outlined_button.0.dart **
/// {@end-tool}
///
/// The static [styleFrom] method is a convenient way to create a
/// outlined button [ButtonStyle] from simple values.
///
/// See also:
///
/// * [ElevatedButton], a filled Material Design button with a shadow.
/// * [TextButton], a Material Design button without a shadow.
/// * <https://material.io/design/components/buttons.html>
/// * <https://m3.material.io/components/buttons>
class OutlinedButton extends ButtonStyleButton {
/// Create an OutlinedButton.
///
/// The [autofocus] and [clipBehavior] arguments must not be null.
const OutlinedButton({
super.key,
required super.onPressed,
super.onLongPress,
super.onHover,
super.onFocusChange,
super.style,
super.focusNode,
super.autofocus = false,
super.clipBehavior = Clip.none,
super.statesController,
required Widget super.child,
});
/// Create a text button from a pair of widgets that serve as the button's
/// [icon] and [label].
///
/// The icon and label are arranged in a row and padded by 12 logical pixels
/// at the start, and 16 at the end, with an 8 pixel gap in between.
///
/// The [icon] and [label] arguments must not be null.
factory OutlinedButton.icon({
Key? key,
required VoidCallback? onPressed,
VoidCallback? onLongPress,
ButtonStyle? style,
FocusNode? focusNode,
bool? autofocus,
Clip? clipBehavior,
required Widget icon,
required Widget label,
}) = _OutlinedButtonWithIcon;
/// A static convenience method that constructs an outlined button
/// [ButtonStyle] given simple values.
///
///
/// The [foregroundColor] and [disabledForegroundColor] colors are used
/// to create a [MaterialStateProperty] [ButtonStyle.foregroundColor], and
/// a derived [ButtonStyle.overlayColor].
///
/// The [backgroundColor] and [disabledBackgroundColor] colors are
/// used to create a [MaterialStateProperty] [ButtonStyle.backgroundColor].
///
/// Similarly, the [enabledMouseCursor] and [disabledMouseCursor]
/// parameters are used to construct [ButtonStyle.mouseCursor].
///
/// All of the other parameters are either used directly or used to
/// create a [MaterialStateProperty] with a single value for all
/// states.
///
/// All parameters default to null, by default this method returns
/// a [ButtonStyle] that doesn't override anything.
///
/// For example, to override the default shape and outline for an
/// [OutlinedButton], one could write:
///
/// ```dart
/// OutlinedButton(
/// style: OutlinedButton.styleFrom(
/// shape: const StadiumBorder(),
/// side: const BorderSide(width: 2, color: Colors.green),
/// ),
/// child: const Text('Seasons of Love'),
/// onPressed: () {
/// // ...
/// },
/// ),
/// ```
static ButtonStyle styleFrom({
Color? foregroundColor,
Color? backgroundColor,
Color? disabledForegroundColor,
Color? disabledBackgroundColor,
Color? shadowColor,
Color? surfaceTintColor,
double? elevation,
TextStyle? textStyle,
EdgeInsetsGeometry? padding,
Size? minimumSize,
Size? fixedSize,
Size? maximumSize,
BorderSide? side,
OutlinedBorder? shape,
MouseCursor? enabledMouseCursor,
MouseCursor? disabledMouseCursor,
VisualDensity? visualDensity,
MaterialTapTargetSize? tapTargetSize,
Duration? animationDuration,
bool? enableFeedback,
AlignmentGeometry? alignment,
InteractiveInkFeatureFactory? splashFactory,
@Deprecated(
'Use foregroundColor instead. '
'This feature was deprecated after v3.1.0.'
)
Color? primary,
@Deprecated(
'Use disabledForegroundColor instead. '
'This feature was deprecated after v3.1.0.'
)
Color? onSurface,
}) {
final Color? foreground = foregroundColor ?? primary;
final Color? disabledForeground = disabledForegroundColor ?? onSurface?.withOpacity(0.38);
final MaterialStateProperty<Color?>? foregroundColorProp = (foreground == null && disabledForeground == null)
? null
: _OutlinedButtonDefaultColor(foreground, disabledForeground);
final MaterialStateProperty<Color?>? backgroundColorProp = (backgroundColor == null && disabledBackgroundColor == null)
? null
: disabledBackgroundColor == null
? ButtonStyleButton.allOrNull<Color?>(backgroundColor)
: _OutlinedButtonDefaultColor(backgroundColor, disabledBackgroundColor);
final MaterialStateProperty<Color?>? overlayColor = (foreground == null)
? null
: _OutlinedButtonDefaultOverlay(foreground);
final MaterialStateProperty<MouseCursor>? mouseCursor = (enabledMouseCursor == null && disabledMouseCursor == null)
? null
: _OutlinedButtonDefaultMouseCursor(enabledMouseCursor!, disabledMouseCursor!);
return ButtonStyle(
textStyle: ButtonStyleButton.allOrNull<TextStyle>(textStyle),
foregroundColor: foregroundColorProp,
backgroundColor: backgroundColorProp,
overlayColor: overlayColor,
shadowColor: ButtonStyleButton.allOrNull<Color>(shadowColor),
surfaceTintColor: ButtonStyleButton.allOrNull<Color>(surfaceTintColor),
elevation: ButtonStyleButton.allOrNull<double>(elevation),
padding: ButtonStyleButton.allOrNull<EdgeInsetsGeometry>(padding),
minimumSize: ButtonStyleButton.allOrNull<Size>(minimumSize),
fixedSize: ButtonStyleButton.allOrNull<Size>(fixedSize),
maximumSize: ButtonStyleButton.allOrNull<Size>(maximumSize),
side: ButtonStyleButton.allOrNull<BorderSide>(side),
shape: ButtonStyleButton.allOrNull<OutlinedBorder>(shape),
mouseCursor: mouseCursor,
visualDensity: visualDensity,
tapTargetSize: tapTargetSize,
animationDuration: animationDuration,
enableFeedback: enableFeedback,
alignment: alignment,
splashFactory: splashFactory,
);
}
/// Defines the button's default appearance.
///
/// With the exception of [ButtonStyle.side], which defines the
/// outline, and [ButtonStyle.padding], the returned style is the
/// same as for [TextButton].
///
/// The button [child]'s [Text] and [Icon] widgets are rendered with
/// the [ButtonStyle]'s foreground color. The button's [InkWell] adds
/// the style's overlay color when the button is focused, hovered
/// or pressed. The button's background color becomes its [Material]
/// color and is transparent by default.
///
/// All of the ButtonStyle's defaults appear below. In this list
/// "Theme.foo" is shorthand for `Theme.of(context).foo`. Color
/// scheme values like "onSurface(0.38)" are shorthand for
/// `onSurface.withOpacity(0.38)`. [MaterialStateProperty] valued
/// properties that are not followed by a sublist have the same
/// value for all states, otherwise the values are as specified for
/// each state and "others" means all other states.
///
/// The color of the [ButtonStyle.textStyle] is not used, the
/// [ButtonStyle.foregroundColor] is used instead.
///
/// ## Material 2 defaults
///
/// * `textStyle` - Theme.textTheme.button
/// * `backgroundColor` - transparent
/// * `foregroundColor`
/// * disabled - Theme.colorScheme.onSurface(0.38)
/// * others - Theme.colorScheme.primary
/// * `overlayColor`
/// * hovered - Theme.colorScheme.primary(0.04)
/// * focused or pressed - Theme.colorScheme.primary(0.12)
/// * `shadowColor` - Theme.shadowColor
/// * `elevation` - 0
/// * `padding`
/// * `textScaleFactor <= 1` - horizontal(16)
/// * `1 < textScaleFactor <= 2` - lerp(horizontal(16), horizontal(8))
/// * `2 < textScaleFactor <= 3` - lerp(horizontal(8), horizontal(4))
/// * `3 < textScaleFactor` - horizontal(4)
/// * `minimumSize` - Size(64, 36)
/// * `fixedSize` - null
/// * `maximumSize` - Size.infinite
/// * `side` - BorderSide(width: 1, color: Theme.colorScheme.onSurface(0.12))
/// * `shape` - RoundedRectangleBorder(borderRadius: BorderRadius.circular(4))
/// * `mouseCursor`
/// * disabled - SystemMouseCursors.basic
/// * others - SystemMouseCursors.click
/// * `visualDensity` - theme.visualDensity
/// * `tapTargetSize` - theme.materialTapTargetSize
/// * `animationDuration` - kThemeChangeDuration
/// * `enableFeedback` - true
/// * `alignment` - Alignment.center
/// * `splashFactory` - InkRipple.splashFactory
///
/// ## Material 3 defaults
///
/// If [ThemeData.useMaterial3] is set to true the following defaults will
/// be used:
///
/// * `textStyle` - Theme.textTheme.labelLarge
/// * `backgroundColor` - transparent
/// * `foregroundColor`
/// * disabled - Theme.colorScheme.onSurface(0.38)
/// * others - Theme.colorScheme.primary
/// * `overlayColor`
/// * hovered - Theme.colorScheme.primary(0.08)
/// * focused or pressed - Theme.colorScheme.primary(0.12)
/// * others - null
/// * `shadowColor` - null
/// * `surfaceTintColor` - null
/// * `elevation` - 0
/// * `padding`
/// * `textScaleFactor <= 1` - horizontal(16)
/// * `1 < textScaleFactor <= 2` - lerp(horizontal(16), horizontal(8))
/// * `2 < textScaleFactor <= 3` - lerp(horizontal(8), horizontal(4))
/// * `3 < textScaleFactor` - horizontal(4)
/// * `minimumSize` - Size(64, 40)
/// * `fixedSize` - null
/// * `maximumSize` - Size.infinite
/// * `side`
/// * disabled - BorderSide(color: Theme.colorScheme.onSurface(0.12))
/// * others - BorderSide(color: Theme.colorScheme.outline)
/// * `shape` - StadiumBorder()
/// * `mouseCursor`
/// * disabled - SystemMouseCursors.basic
/// * others - SystemMouseCursors.click
/// * `visualDensity` - theme.visualDensity
/// * `tapTargetSize` - theme.materialTapTargetSize
/// * `animationDuration` - kThemeChangeDuration
/// * `enableFeedback` - true
/// * `alignment` - Alignment.center
/// * `splashFactory` - Theme.splashFactory
@override
ButtonStyle defaultStyleOf(BuildContext context) {
final ThemeData theme = Theme.of(context);
final ColorScheme colorScheme = theme.colorScheme;
return Theme.of(context).useMaterial3
? _OutlinedButtonDefaultsM3(context)
: styleFrom(
foregroundColor: colorScheme.primary,
disabledForegroundColor: colorScheme.onSurface.withOpacity(0.38),
backgroundColor: Colors.transparent,
disabledBackgroundColor: Colors.transparent,
shadowColor: theme.shadowColor,
elevation: 0,
textStyle: theme.textTheme.labelLarge,
padding: _scaledPadding(context),
minimumSize: const Size(64, 36),
maximumSize: Size.infinite,
side: BorderSide(
color: Theme.of(context).colorScheme.onSurface.withOpacity(0.12),
),
shape: const RoundedRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(4))),
enabledMouseCursor: SystemMouseCursors.click,
disabledMouseCursor: SystemMouseCursors.basic,
visualDensity: theme.visualDensity,
tapTargetSize: theme.materialTapTargetSize,
animationDuration: kThemeChangeDuration,
enableFeedback: true,
alignment: Alignment.center,
splashFactory: InkRipple.splashFactory,
);
}
@override
ButtonStyle? themeStyleOf(BuildContext context) {
return OutlinedButtonTheme.of(context).style;
}
}
EdgeInsetsGeometry _scaledPadding(BuildContext context) {
return ButtonStyleButton.scaledPadding(
const EdgeInsets.symmetric(horizontal: 16),
const EdgeInsets.symmetric(horizontal: 8),
const EdgeInsets.symmetric(horizontal: 4),
MediaQuery.maybeOf(context)?.textScaleFactor ?? 1,
);
}
@immutable
class _OutlinedButtonDefaultColor extends MaterialStateProperty<Color?> with Diagnosticable {
_OutlinedButtonDefaultColor(this.color, this.disabled);
final Color? color;
final Color? disabled;
@override
Color? resolve(Set<MaterialState> states) {
if (states.contains(MaterialState.disabled)) {
return disabled;
}
return color;
}
}
@immutable
class _OutlinedButtonDefaultOverlay extends MaterialStateProperty<Color?> with Diagnosticable {
_OutlinedButtonDefaultOverlay(this.foreground);
final Color foreground;
@override
Color? resolve(Set<MaterialState> states) {
if (states.contains(MaterialState.hovered)) {
return foreground.withOpacity(0.04);
}
if (states.contains(MaterialState.focused) || states.contains(MaterialState.pressed)) {
return foreground.withOpacity(0.12);
}
return null;
}
}
@immutable
class _OutlinedButtonDefaultMouseCursor extends MaterialStateProperty<MouseCursor> with Diagnosticable {
_OutlinedButtonDefaultMouseCursor(this.enabledCursor, this.disabledCursor);
final MouseCursor enabledCursor;
final MouseCursor disabledCursor;
@override
MouseCursor resolve(Set<MaterialState> states) {
if (states.contains(MaterialState.disabled)) {
return disabledCursor;
}
return enabledCursor;
}
}
class _OutlinedButtonWithIcon extends OutlinedButton {
_OutlinedButtonWithIcon({
super.key,
required super.onPressed,
super.onLongPress,
super.style,
super.focusNode,
bool? autofocus,
Clip? clipBehavior,
required Widget icon,
required Widget label,
}) : assert(icon != null),
assert(label != null),
super(
autofocus: autofocus ?? false,
clipBehavior: clipBehavior ?? Clip.none,
child: _OutlinedButtonWithIconChild(icon: icon, label: label),
);
}
class _OutlinedButtonWithIconChild extends StatelessWidget {
const _OutlinedButtonWithIconChild({
required this.label,
required this.icon,
});
final Widget label;
final Widget icon;
@override
Widget build(BuildContext context) {
final double scale = MediaQuery.maybeOf(context)?.textScaleFactor ?? 1;
final double gap = scale <= 1 ? 8 : lerpDouble(8, 4, math.min(scale - 1, 1))!;
return Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[icon, SizedBox(width: gap), Flexible(child: label)],
);
}
}
// BEGIN GENERATED TOKEN PROPERTIES - OutlinedButton
// Do not edit by hand. The code between the "BEGIN GENERATED" and
// "END GENERATED" comments are generated from data in the Material
// Design token database by the script:
// dev/tools/gen_defaults/bin/gen_defaults.dart.
// Token database version: v0_101
class _OutlinedButtonDefaultsM3 extends ButtonStyle {
_OutlinedButtonDefaultsM3(this.context)
: super(
animationDuration: kThemeChangeDuration,
enableFeedback: true,
alignment: Alignment.center,
);
final BuildContext context;
late final ColorScheme _colors = Theme.of(context).colorScheme;
@override
MaterialStateProperty<TextStyle?> get textStyle =>
MaterialStatePropertyAll<TextStyle?>(Theme.of(context).textTheme.labelLarge);
@override
MaterialStateProperty<Color?>? get backgroundColor =>
ButtonStyleButton.allOrNull<Color>(Colors.transparent);
@override
MaterialStateProperty<Color?>? get foregroundColor =>
MaterialStateProperty.resolveWith((Set<MaterialState> states) {
if (states.contains(MaterialState.disabled)) {
return _colors.onSurface.withOpacity(0.38);
}
return _colors.primary;
});
@override
MaterialStateProperty<Color?>? get overlayColor =>
MaterialStateProperty.resolveWith((Set<MaterialState> states) {
if (states.contains(MaterialState.hovered)) {
return _colors.primary.withOpacity(0.08);
}
if (states.contains(MaterialState.focused)) {
return _colors.primary.withOpacity(0.12);
}
if (states.contains(MaterialState.pressed)) {
return _colors.primary.withOpacity(0.12);
}
return null;
});
// No default shadow color
// No default surface tint color
@override
MaterialStateProperty<double>? get elevation =>
ButtonStyleButton.allOrNull<double>(0.0);
@override
MaterialStateProperty<EdgeInsetsGeometry>? get padding =>
ButtonStyleButton.allOrNull<EdgeInsetsGeometry>(_scaledPadding(context));
@override
MaterialStateProperty<Size>? get minimumSize =>
ButtonStyleButton.allOrNull<Size>(const Size(64.0, 40.0));
// No default fixedSize
@override
MaterialStateProperty<Size>? get maximumSize =>
ButtonStyleButton.allOrNull<Size>(Size.infinite);
@override
MaterialStateProperty<BorderSide>? get side =>
MaterialStateProperty.resolveWith((Set<MaterialState> states) {
if (states.contains(MaterialState.disabled)) {
return BorderSide(color: _colors.onSurface.withOpacity(0.12));
}
return BorderSide(color: _colors.outline);
});
@override
MaterialStateProperty<OutlinedBorder>? get shape =>
ButtonStyleButton.allOrNull<OutlinedBorder>(const StadiumBorder());
@override
MaterialStateProperty<MouseCursor?>? get mouseCursor =>
MaterialStateProperty.resolveWith((Set<MaterialState> states) {
if (states.contains(MaterialState.disabled)) {
return SystemMouseCursors.basic;
}
return SystemMouseCursors.click;
});
@override
VisualDensity? get visualDensity => Theme.of(context).visualDensity;
@override
MaterialTapTargetSize? get tapTargetSize => Theme.of(context).materialTapTargetSize;
@override
InteractiveInkFeatureFactory? get splashFactory => Theme.of(context).splashFactory;
}
// END GENERATED TOKEN PROPERTIES - OutlinedButton