33ed6a3533
* Added support for surfaceTintColor and shadowColor to the Dialog widgets. * Updated the defaults for Material.shadowColor and Material.surfaceTint to allow turning off the features with a transparent color. * Added support for shadowColor and surfaceTintColor for Drawer widget.
595 lines
21 KiB
Dart
595 lines
21 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:math' as math;
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import 'dart:ui' show lerpDouble;
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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import 'button_style.dart';
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import 'button_style_button.dart';
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import 'color_scheme.dart';
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import 'colors.dart';
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import 'constants.dart';
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import 'ink_ripple.dart';
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import 'ink_well.dart';
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import 'material_state.dart';
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import 'text_button_theme.dart';
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import 'theme.dart';
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import 'theme_data.dart';
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/// A Material Design "Text Button".
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///
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/// Use text buttons on toolbars, in dialogs, or inline with other
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/// content but offset from that content with padding so that the
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/// button's presence is obvious. Text buttons do not have visible
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/// borders and must therefore rely on their position relative to
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/// other content for context. In dialogs and cards, they should be
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/// grouped together in one of the bottom corners. Avoid using text
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/// buttons where they would blend in with other content, for example
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/// in the middle of lists.
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///
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/// A text button is a label [child] displayed on a (zero elevation)
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/// [Material] widget. The label's [Text] and [Icon] widgets are
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/// displayed in the [style]'s [ButtonStyle.foregroundColor]. The
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/// button reacts to touches by filling with the [style]'s
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/// [ButtonStyle.backgroundColor].
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///
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/// The text button's default style is defined by [defaultStyleOf].
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/// The style of this text button can be overridden with its [style]
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/// parameter. The style of all text buttons in a subtree can be
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/// overridden with the [TextButtonTheme] and the style of all of the
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/// text buttons in an app can be overridden with the [Theme]'s
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/// [ThemeData.textButtonTheme] property.
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///
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/// The static [styleFrom] method is a convenient way to create a
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/// text button [ButtonStyle] from simple values.
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///
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/// If the [onPressed] and [onLongPress] callbacks are null, then this
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/// button will be disabled, it will not react to touch.
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///
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/// {@tool dartpad}
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/// This sample shows how to render a disabled TextButton, an enabled TextButton
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/// and lastly a TextButton with gradient background.
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///
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/// ** See code in examples/api/lib/material/text_button/text_button.0.dart **
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/// {@end-tool}
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///
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/// {@tool dartpad}
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/// This sample demonstrates using the [statesController] parameter to create a button
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/// that adds support for [MaterialState.selected].
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///
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/// ** See code in examples/api/lib/material/text_button/text_button.1.dart **
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/// {@end-tool}
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///
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/// See also:
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///
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/// * [ElevatedButton], a filled button whose material elevates when pressed.
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/// * [FilledButton], a filled button that doesn't elevate when pressed.
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/// * [FilledButton.tonal], a filled button variant that uses a secondary fill color.
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/// * [OutlinedButton], a button with an outlined border and no fill color.
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/// * <https://material.io/design/components/buttons.html>
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/// * <https://m3.material.io/components/buttons>
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class TextButton extends ButtonStyleButton {
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/// Create a TextButton.
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///
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/// The [autofocus] and [clipBehavior] arguments must not be null.
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const TextButton({
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super.key,
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required super.onPressed,
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super.onLongPress,
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super.onHover,
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super.onFocusChange,
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super.style,
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super.focusNode,
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super.autofocus = false,
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super.clipBehavior = Clip.none,
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super.statesController,
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required Widget super.child,
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});
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/// Create a text button from a pair of widgets that serve as the button's
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/// [icon] and [label].
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///
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/// The icon and label are arranged in a row and padded by 8 logical pixels
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/// at the ends, with an 8 pixel gap in between.
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///
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/// The [icon] and [label] arguments must not be null.
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factory TextButton.icon({
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Key? key,
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required VoidCallback? onPressed,
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VoidCallback? onLongPress,
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ValueChanged<bool>? onHover,
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ValueChanged<bool>? onFocusChange,
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ButtonStyle? style,
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FocusNode? focusNode,
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bool? autofocus,
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Clip? clipBehavior,
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required Widget icon,
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required Widget label,
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}) = _TextButtonWithIcon;
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/// A static convenience method that constructs a text button
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/// [ButtonStyle] given simple values.
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///
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/// The [foregroundColor] and [disabledForegroundColor] colors are used
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/// to create a [MaterialStateProperty] [ButtonStyle.foregroundColor], and
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/// a derived [ButtonStyle.overlayColor].
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///
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/// The [backgroundColor] and [disabledBackgroundColor] colors are
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/// used to create a [MaterialStateProperty] [ButtonStyle.backgroundColor].
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///
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/// Similarly, the [enabledMouseCursor] and [disabledMouseCursor]
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/// parameters are used to construct [ButtonStyle.mouseCursor].
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///
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/// All of the other parameters are either used directly or used to
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/// create a [MaterialStateProperty] with a single value for all
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/// states.
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///
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/// All parameters default to null. By default this method returns
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/// a [ButtonStyle] that doesn't override anything.
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///
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/// For example, to override the default text and icon colors for a
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/// [TextButton], as well as its overlay color, with all of the
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/// standard opacity adjustments for the pressed, focused, and
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/// hovered states, one could write:
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///
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/// ```dart
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/// TextButton(
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/// style: TextButton.styleFrom(foregroundColor: Colors.green),
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/// child: const Text('Give Kate a mix tape'),
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/// onPressed: () {
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/// // ...
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/// },
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/// ),
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/// ```
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static ButtonStyle styleFrom({
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Color? foregroundColor,
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Color? backgroundColor,
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Color? disabledForegroundColor,
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Color? disabledBackgroundColor,
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Color? shadowColor,
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Color? surfaceTintColor,
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double? elevation,
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TextStyle? textStyle,
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EdgeInsetsGeometry? padding,
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Size? minimumSize,
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Size? fixedSize,
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Size? maximumSize,
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BorderSide? side,
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OutlinedBorder? shape,
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MouseCursor? enabledMouseCursor,
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MouseCursor? disabledMouseCursor,
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VisualDensity? visualDensity,
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MaterialTapTargetSize? tapTargetSize,
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Duration? animationDuration,
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bool? enableFeedback,
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AlignmentGeometry? alignment,
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InteractiveInkFeatureFactory? splashFactory,
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@Deprecated(
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'Use foregroundColor instead. '
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'This feature was deprecated after v3.1.0.'
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)
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Color? primary,
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@Deprecated(
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'Use disabledForegroundColor instead. '
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'This feature was deprecated after v3.1.0.'
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)
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Color? onSurface,
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}) {
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final Color? foreground = foregroundColor ?? primary;
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final Color? disabledForeground = disabledForegroundColor ?? onSurface?.withOpacity(0.38);
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final MaterialStateProperty<Color?>? foregroundColorProp = (foreground == null && disabledForeground == null)
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? null
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: _TextButtonDefaultColor(foreground, disabledForeground);
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final MaterialStateProperty<Color?>? backgroundColorProp = (backgroundColor == null && disabledBackgroundColor == null)
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? null
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: disabledBackgroundColor == null
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? ButtonStyleButton.allOrNull<Color?>(backgroundColor)
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: _TextButtonDefaultColor(backgroundColor, disabledBackgroundColor);
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final MaterialStateProperty<Color?>? overlayColor = (foreground == null)
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? null
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: _TextButtonDefaultOverlay(foreground);
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final MaterialStateProperty<MouseCursor>? mouseCursor = (enabledMouseCursor == null && disabledMouseCursor == null)
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? null
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: _TextButtonDefaultMouseCursor(enabledMouseCursor!, disabledMouseCursor!);
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return ButtonStyle(
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textStyle: ButtonStyleButton.allOrNull<TextStyle>(textStyle),
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foregroundColor: foregroundColorProp,
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backgroundColor: backgroundColorProp,
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overlayColor: overlayColor,
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shadowColor: ButtonStyleButton.allOrNull<Color>(shadowColor),
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surfaceTintColor: ButtonStyleButton.allOrNull<Color>(surfaceTintColor),
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elevation: ButtonStyleButton.allOrNull<double>(elevation),
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padding: ButtonStyleButton.allOrNull<EdgeInsetsGeometry>(padding),
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minimumSize: ButtonStyleButton.allOrNull<Size>(minimumSize),
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fixedSize: ButtonStyleButton.allOrNull<Size>(fixedSize),
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maximumSize: ButtonStyleButton.allOrNull<Size>(maximumSize),
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side: ButtonStyleButton.allOrNull<BorderSide>(side),
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shape: ButtonStyleButton.allOrNull<OutlinedBorder>(shape),
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mouseCursor: mouseCursor,
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visualDensity: visualDensity,
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tapTargetSize: tapTargetSize,
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animationDuration: animationDuration,
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enableFeedback: enableFeedback,
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alignment: alignment,
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splashFactory: splashFactory,
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);
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}
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/// Defines the button's default appearance.
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///
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/// The button [child]'s [Text] and [Icon] widgets are rendered with
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/// the [ButtonStyle]'s foreground color. The button's [InkWell] adds
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/// the style's overlay color when the button is focused, hovered
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/// or pressed. The button's background color becomes its [Material]
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/// color and is transparent by default.
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///
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/// All of the ButtonStyle's defaults appear below.
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///
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/// In this list "Theme.foo" is shorthand for
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/// `Theme.of(context).foo`. Color scheme values like
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/// "onSurface(0.38)" are shorthand for
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/// `onSurface.withOpacity(0.38)`. [MaterialStateProperty] valued
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/// properties that are not followed by a sublist have the same
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/// value for all states, otherwise the values are as specified for
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/// each state and "others" means all other states.
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///
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/// The `textScaleFactor` is the value of
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/// `MediaQuery.of(context).textScaleFactor` and the names of the
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/// EdgeInsets constructors and `EdgeInsetsGeometry.lerp` have been
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/// abbreviated for readability.
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///
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/// The color of the [ButtonStyle.textStyle] is not used, the
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/// [ButtonStyle.foregroundColor] color is used instead.
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///
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/// ## Material 2 defaults
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///
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/// * `textStyle` - Theme.textTheme.button
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/// * `backgroundColor` - transparent
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/// * `foregroundColor`
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/// * disabled - Theme.colorScheme.onSurface(0.38)
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/// * others - Theme.colorScheme.primary
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/// * `overlayColor`
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/// * hovered - Theme.colorScheme.primary(0.04)
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/// * focused or pressed - Theme.colorScheme.primary(0.12)
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/// * `shadowColor` - Theme.shadowColor
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/// * `elevation` - 0
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/// * `padding`
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/// * `textScaleFactor <= 1` - all(8)
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/// * `1 < textScaleFactor <= 2` - lerp(all(8), horizontal(8))
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/// * `2 < textScaleFactor <= 3` - lerp(horizontal(8), horizontal(4))
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/// * `3 < textScaleFactor` - horizontal(4)
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/// * `minimumSize` - Size(64, 36)
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/// * `fixedSize` - null
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/// * `maximumSize` - Size.infinite
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/// * `side` - null
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/// * `shape` - RoundedRectangleBorder(borderRadius: BorderRadius.circular(4))
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/// * `mouseCursor`
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/// * disabled - SystemMouseCursors.basic
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/// * others - SystemMouseCursors.click
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/// * `visualDensity` - theme.visualDensity
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/// * `tapTargetSize` - theme.materialTapTargetSize
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/// * `animationDuration` - kThemeChangeDuration
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/// * `enableFeedback` - true
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/// * `alignment` - Alignment.center
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/// * `splashFactory` - InkRipple.splashFactory
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///
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/// The default padding values for the [TextButton.icon] factory are slightly different:
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///
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/// * `padding`
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/// * `textScaleFactor <= 1` - all(8)
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/// * `1 < textScaleFactor <= 2 `- lerp(all(8), horizontal(4))
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/// * `2 < textScaleFactor` - horizontal(4)
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///
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/// The default value for `side`, which defines the appearance of the button's
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/// outline, is null. That means that the outline is defined by the button
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/// shape's [OutlinedBorder.side]. Typically the default value of an
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/// [OutlinedBorder]'s side is [BorderSide.none], so an outline is not drawn.
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///
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/// ## Material 3 defaults
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///
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/// If [ThemeData.useMaterial3] is set to true the following defaults will
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/// be used:
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///
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/// * `textStyle` - Theme.textTheme.labelLarge
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/// * `backgroundColor` - transparent
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/// * `foregroundColor`
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/// * disabled - Theme.colorScheme.onSurface(0.38)
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/// * others - Theme.colorScheme.primary
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/// * `overlayColor`
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/// * hovered - Theme.colorScheme.primary(0.08)
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/// * focused or pressed - Theme.colorScheme.primary(0.12)
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/// * others - null
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/// * `shadowColor` - null
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/// * `surfaceTintColor` - null
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/// * `elevation` - 0
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/// * `padding`
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/// * `textScaleFactor <= 1` - all(8)
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/// * `1 < textScaleFactor <= 2` - lerp(all(8), horizontal(8))
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/// * `2 < textScaleFactor <= 3` - lerp(horizontal(8), horizontal(4))
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/// * `3 < textScaleFactor` - horizontal(4)
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/// * `minimumSize` - Size(64, 40)
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/// * `fixedSize` - null
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/// * `maximumSize` - Size.infinite
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/// * `side` - null
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/// * `shape` - StadiumBorder()
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/// * `mouseCursor`
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/// * disabled - SystemMouseCursors.basic
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/// * others - SystemMouseCursors.click
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/// * `visualDensity` - theme.visualDensity
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/// * `tapTargetSize` - theme.materialTapTargetSize
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/// * `animationDuration` - kThemeChangeDuration
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/// * `enableFeedback` - true
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/// * `alignment` - Alignment.center
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/// * `splashFactory` - Theme.splashFactory
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@override
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ButtonStyle defaultStyleOf(BuildContext context) {
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final ThemeData theme = Theme.of(context);
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final ColorScheme colorScheme = theme.colorScheme;
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return Theme.of(context).useMaterial3
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? _TextButtonDefaultsM3(context)
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: styleFrom(
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foregroundColor: colorScheme.primary,
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disabledForegroundColor: colorScheme.onSurface.withOpacity(0.38),
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backgroundColor: Colors.transparent,
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disabledBackgroundColor: Colors.transparent,
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shadowColor: theme.shadowColor,
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elevation: 0,
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textStyle: theme.textTheme.labelLarge,
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padding: _scaledPadding(context),
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minimumSize: const Size(64, 36),
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maximumSize: Size.infinite,
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shape: const RoundedRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(4))),
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enabledMouseCursor: SystemMouseCursors.click,
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disabledMouseCursor: SystemMouseCursors.basic,
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visualDensity: theme.visualDensity,
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tapTargetSize: theme.materialTapTargetSize,
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animationDuration: kThemeChangeDuration,
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enableFeedback: true,
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alignment: Alignment.center,
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splashFactory: InkRipple.splashFactory,
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);
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}
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/// Returns the [TextButtonThemeData.style] of the closest
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/// [TextButtonTheme] ancestor.
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@override
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ButtonStyle? themeStyleOf(BuildContext context) {
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return TextButtonTheme.of(context).style;
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}
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}
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EdgeInsetsGeometry _scaledPadding(BuildContext context) {
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return ButtonStyleButton.scaledPadding(
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const EdgeInsets.all(8),
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const EdgeInsets.symmetric(horizontal: 8),
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const EdgeInsets.symmetric(horizontal: 4),
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MediaQuery.maybeOf(context)?.textScaleFactor ?? 1,
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);
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}
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@immutable
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class _TextButtonDefaultColor extends MaterialStateProperty<Color?> {
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_TextButtonDefaultColor(this.color, this.disabled);
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final Color? color;
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final Color? disabled;
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@override
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Color? resolve(Set<MaterialState> states) {
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if (states.contains(MaterialState.disabled)) {
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return disabled;
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}
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return color;
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}
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@override
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String toString() {
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return '{disabled: $disabled, otherwise: $color}';
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}
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}
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@immutable
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class _TextButtonDefaultOverlay extends MaterialStateProperty<Color?> {
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_TextButtonDefaultOverlay(this.primary);
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final Color primary;
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@override
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Color? resolve(Set<MaterialState> states) {
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if (states.contains(MaterialState.hovered)) {
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return primary.withOpacity(0.04);
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}
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if (states.contains(MaterialState.focused) || states.contains(MaterialState.pressed)) {
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return primary.withOpacity(0.12);
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}
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return null;
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}
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@override
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String toString() {
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return '{hovered: ${primary.withOpacity(0.04)}, focused,pressed: ${primary.withOpacity(0.12)}, otherwise: null}';
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}
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}
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@immutable
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class _TextButtonDefaultMouseCursor extends MaterialStateProperty<MouseCursor> with Diagnosticable {
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_TextButtonDefaultMouseCursor(this.enabledCursor, this.disabledCursor);
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final MouseCursor enabledCursor;
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final MouseCursor disabledCursor;
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@override
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MouseCursor resolve(Set<MaterialState> states) {
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if (states.contains(MaterialState.disabled)) {
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return disabledCursor;
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}
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return enabledCursor;
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}
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}
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class _TextButtonWithIcon extends TextButton {
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_TextButtonWithIcon({
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super.key,
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required super.onPressed,
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super.onLongPress,
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super.onHover,
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super.onFocusChange,
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super.style,
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super.focusNode,
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bool? autofocus,
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Clip? clipBehavior,
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required Widget icon,
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required Widget label,
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}) : assert(icon != null),
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assert(label != null),
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super(
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autofocus: autofocus ?? false,
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clipBehavior: clipBehavior ?? Clip.none,
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child: _TextButtonWithIconChild(icon: icon, label: label),
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);
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@override
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ButtonStyle defaultStyleOf(BuildContext context) {
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final EdgeInsetsGeometry scaledPadding = ButtonStyleButton.scaledPadding(
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const EdgeInsets.all(8),
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const EdgeInsets.symmetric(horizontal: 4),
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const EdgeInsets.symmetric(horizontal: 4),
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MediaQuery.maybeOf(context)?.textScaleFactor ?? 1,
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);
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return super.defaultStyleOf(context).copyWith(
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padding: MaterialStatePropertyAll<EdgeInsetsGeometry>(scaledPadding),
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);
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}
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}
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class _TextButtonWithIconChild extends StatelessWidget {
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const _TextButtonWithIconChild({
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required this.label,
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required this.icon,
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});
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final Widget label;
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final Widget icon;
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@override
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Widget build(BuildContext context) {
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final double scale = MediaQuery.maybeOf(context)?.textScaleFactor ?? 1;
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final double gap = scale <= 1 ? 8 : lerpDouble(8, 4, math.min(scale - 1, 1))!;
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return Row(
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mainAxisSize: MainAxisSize.min,
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children: <Widget>[icon, SizedBox(width: gap), Flexible(child: label)],
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);
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}
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}
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// BEGIN GENERATED TOKEN PROPERTIES - TextButton
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// Do not edit by hand. The code between the "BEGIN GENERATED" and
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// "END GENERATED" comments are generated from data in the Material
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// Design token database by the script:
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// dev/tools/gen_defaults/bin/gen_defaults.dart.
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// Token database version: v0_101
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class _TextButtonDefaultsM3 extends ButtonStyle {
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_TextButtonDefaultsM3(this.context)
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: super(
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animationDuration: kThemeChangeDuration,
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enableFeedback: true,
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alignment: Alignment.center,
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);
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final BuildContext context;
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late final ColorScheme _colors = Theme.of(context).colorScheme;
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@override
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MaterialStateProperty<TextStyle?> get textStyle =>
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MaterialStatePropertyAll<TextStyle?>(Theme.of(context).textTheme.labelLarge);
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@override
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MaterialStateProperty<Color?>? get backgroundColor =>
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const MaterialStatePropertyAll<Color>(Colors.transparent);
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@override
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MaterialStateProperty<Color?>? get foregroundColor =>
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MaterialStateProperty.resolveWith((Set<MaterialState> states) {
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if (states.contains(MaterialState.disabled)) {
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return _colors.onSurface.withOpacity(0.38);
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}
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return _colors.primary;
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});
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@override
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MaterialStateProperty<Color?>? get overlayColor =>
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MaterialStateProperty.resolveWith((Set<MaterialState> states) {
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if (states.contains(MaterialState.hovered)) {
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return _colors.primary.withOpacity(0.08);
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}
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if (states.contains(MaterialState.focused)) {
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return _colors.primary.withOpacity(0.12);
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}
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if (states.contains(MaterialState.pressed)) {
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return _colors.primary.withOpacity(0.12);
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}
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return null;
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});
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@override
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MaterialStateProperty<Color>? get shadowColor =>
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const MaterialStatePropertyAll<Color>(Colors.transparent);
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@override
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MaterialStateProperty<Color>? get surfaceTintColor =>
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const MaterialStatePropertyAll<Color>(Colors.transparent);
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@override
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MaterialStateProperty<double>? get elevation =>
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const MaterialStatePropertyAll<double>(0.0);
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@override
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MaterialStateProperty<EdgeInsetsGeometry>? get padding =>
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MaterialStatePropertyAll<EdgeInsetsGeometry>(_scaledPadding(context));
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@override
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MaterialStateProperty<Size>? get minimumSize =>
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const MaterialStatePropertyAll<Size>(Size(64.0, 40.0));
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// No default fixedSize
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@override
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MaterialStateProperty<Size>? get maximumSize =>
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const MaterialStatePropertyAll<Size>(Size.infinite);
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// No default side
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@override
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MaterialStateProperty<OutlinedBorder>? get shape =>
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const MaterialStatePropertyAll<OutlinedBorder>(StadiumBorder());
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@override
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MaterialStateProperty<MouseCursor?>? get mouseCursor =>
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MaterialStateProperty.resolveWith((Set<MaterialState> states) {
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if (states.contains(MaterialState.disabled)) {
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return SystemMouseCursors.basic;
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}
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return SystemMouseCursors.click;
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});
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@override
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VisualDensity? get visualDensity => Theme.of(context).visualDensity;
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@override
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MaterialTapTargetSize? get tapTargetSize => Theme.of(context).materialTapTargetSize;
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@override
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InteractiveInkFeatureFactory? get splashFactory => Theme.of(context).splashFactory;
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}
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// END GENERATED TOKEN PROPERTIES - TextButton
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