packages/flutter/lib/src/material/button_bar_theme.dart - mirrors/flutter - Git at Google

 // 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:ui' show lerpDouble;

 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';

 import 'button_theme.dart';
 import 'theme.dart';

 /// Defines the visual properties of [ButtonBar] widgets.
 ///
 /// Used by [ButtonBarTheme] to control the visual properties of [ButtonBar]
 /// instances in a widget subtree.
 ///
 /// To obtain this configuration, use [ButtonBarTheme.of] to access the closest
 /// ancestor [ButtonBarTheme] of the current [BuildContext].
 ///
 /// See also:
 ///
 ///  * [ButtonBarTheme], an [InheritedWidget] that propagates the theme down
 ///    its subtree.
 ///  * [ButtonBar], which uses this to configure itself and its children
 ///    button widgets.
 class ButtonBarThemeData with Diagnosticable {
   /// Constructs the set of properties used to configure [ButtonBar] widgets.
   ///
   /// Both [buttonMinWidth] and [buttonHeight] must be non-negative if they
   /// are not null.
   const ButtonBarThemeData({
     this.alignment,
     this.mainAxisSize,
     this.buttonTextTheme,
     this.buttonMinWidth,
     this.buttonHeight,
     this.buttonPadding,
     this.buttonAlignedDropdown,
     this.layoutBehavior,
     this.overflowDirection,
   }) : assert(buttonMinWidth == null || buttonMinWidth >= 0.0),
        assert(buttonHeight == null || buttonHeight >= 0.0);

   /// How the children should be placed along the horizontal axis.
   final MainAxisAlignment alignment;

   /// How much horizontal space is available. See [Row.mainAxisSize].
   final MainAxisSize mainAxisSize;

   /// Defines a [ButtonBar] button's base colors, and the defaults for
   /// the button's minimum size, internal padding, and shape.
   ///
   /// This will override the surrounding [ButtonTheme.textTheme] setting
   /// for buttons contained in the [ButtonBar].
   ///
   /// Despite the name, this property is not a [TextTheme], its value is not a
   /// collection of [TextStyle]s.
   final ButtonTextTheme buttonTextTheme;

   /// The minimum width for [ButtonBar] buttons.
   ///
   /// This will override the surrounding [ButtonTheme.minWidth] setting
   /// for buttons contained in the [ButtonBar].
   ///
   /// The actual horizontal space allocated for a button's child is
   /// at least this value less the theme's horizontal [padding].
   final double buttonMinWidth;

   /// The minimum height for [ButtonBar] buttons.
   ///
   /// This will override the surrounding [ButtonTheme.height] setting
   /// for buttons contained in the [ButtonBar].
   final double buttonHeight;

   /// Padding for a [ButtonBar] button's child (typically the button's label).
   ///
   /// This will override the surrounding [ButtonTheme.padding] setting
   /// for buttons contained in the [ButtonBar].
   final EdgeInsetsGeometry buttonPadding;

   /// If true, then a [DropdownButton] menu's width will match the [ButtonBar]
   /// button's width.
   ///
   /// If false, then the dropdown's menu will be wider than
   /// its button. In either case the dropdown button will line up the leading
   /// edge of the menu's value with the leading edge of the values
   /// displayed by the menu items.
   ///
   /// This will override the surrounding [ButtonTheme.alignedDropdown] setting
   /// for buttons contained in the [ButtonBar].
   ///
   /// This property only affects [DropdownButton] contained in a [ButtonBar]
   /// and its menu.
   final bool buttonAlignedDropdown;

   /// Defines whether a [ButtonBar] should size itself with a minimum size
   /// constraint or with padding.
   final ButtonBarLayoutBehavior layoutBehavior;

   /// Defines the vertical direction of a [ButtonBar]'s children if it
   /// overflows.
   ///
   /// If the [ButtonBar]'s children do not fit into a single row, then they
   /// are arranged in a column. The first action is at the top of the
   /// column if this property is set to [VerticalDirection.down], since it
   /// "starts" at the top and "ends" at the bottom. On the other hand,
   /// the first action will be at the bottom of the column if this
   /// property is set to [VerticalDirection.up], since it "starts" at the
   /// bottom and "ends" at the top.
   final VerticalDirection overflowDirection;

   /// Creates a copy of this object but with the given fields replaced with the
   /// new values.
   ButtonBarThemeData copyWith({
     MainAxisAlignment alignment,
     MainAxisSize mainAxisSize,
     ButtonTextTheme buttonTextTheme,
     double buttonMinWidth,
     double buttonHeight,
     EdgeInsetsGeometry buttonPadding,
     bool buttonAlignedDropdown,
     ButtonBarLayoutBehavior layoutBehavior,
     VerticalDirection overflowDirection,
   }) {
     return ButtonBarThemeData(
       alignment: alignment ?? this.alignment,
       mainAxisSize: mainAxisSize ?? this.mainAxisSize,
       buttonTextTheme: buttonTextTheme ?? this.buttonTextTheme,
       buttonMinWidth: buttonMinWidth ?? this.buttonMinWidth,
       buttonHeight: buttonHeight ?? this.buttonHeight,
       buttonPadding: buttonPadding ?? this.buttonPadding,
       buttonAlignedDropdown: buttonAlignedDropdown ?? this.buttonAlignedDropdown,
       layoutBehavior: layoutBehavior ?? this.layoutBehavior,
       overflowDirection: overflowDirection ?? this.overflowDirection,
     );
   }

   /// Linearly interpolate between two button bar themes.
   ///
   /// If both arguments are null, then null is returned.
   ///
   /// {@macro dart.ui.shadow.lerp}
   static ButtonBarThemeData lerp(ButtonBarThemeData a, ButtonBarThemeData b, double t) {
     assert(t != null);
     if (a == null && b == null)
       return null;
     return ButtonBarThemeData(
       alignment: t < 0.5 ? a.alignment : b.alignment,
       mainAxisSize: t < 0.5 ? a.mainAxisSize : b.mainAxisSize,
       buttonTextTheme: t < 0.5 ? a.buttonTextTheme : b.buttonTextTheme,
       buttonMinWidth: lerpDouble(a?.buttonMinWidth, b?.buttonMinWidth, t),
       buttonHeight: lerpDouble(a?.buttonHeight, b?.buttonHeight, t),
       buttonPadding: EdgeInsetsGeometry.lerp(a?.buttonPadding, b?.buttonPadding, t),
       buttonAlignedDropdown: t < 0.5 ? a.buttonAlignedDropdown : b.buttonAlignedDropdown,
       layoutBehavior: t < 0.5 ? a.layoutBehavior : b.layoutBehavior,
       overflowDirection: t < 0.5 ? a.overflowDirection : b.overflowDirection,
     );
   }

   @override
   int get hashCode {
     return hashValues(
       alignment,
       mainAxisSize,
       buttonTextTheme,
       buttonMinWidth,
       buttonHeight,
       buttonPadding,
       buttonAlignedDropdown,
       layoutBehavior,
       overflowDirection,
     );
   }

   @override
   bool operator ==(Object other) {
     if (identical(this, other))
       return true;
     if (other.runtimeType != runtimeType)
       return false;
     return other is ButtonBarThemeData
         && other.alignment == alignment
         && other.mainAxisSize == mainAxisSize
         && other.buttonTextTheme == buttonTextTheme
         && other.buttonMinWidth == buttonMinWidth
         && other.buttonHeight == buttonHeight
         && other.buttonPadding == buttonPadding
         && other.buttonAlignedDropdown == buttonAlignedDropdown
         && other.layoutBehavior == layoutBehavior
         && other.overflowDirection == overflowDirection;
   }

   @override
   void debugFillProperties(DiagnosticPropertiesBuilder properties) {
     super.debugFillProperties(properties);
     properties.add(DiagnosticsProperty<MainAxisAlignment>('alignment', alignment, defaultValue: null));
     properties.add(DiagnosticsProperty<MainAxisSize>('mainAxisSize', mainAxisSize, defaultValue: null));
     properties.add(DiagnosticsProperty<ButtonTextTheme>('textTheme', buttonTextTheme, defaultValue: null));
     properties.add(DoubleProperty('minWidth', buttonMinWidth, defaultValue: null));
     properties.add(DoubleProperty('height', buttonHeight, defaultValue: null));
     properties.add(DiagnosticsProperty<EdgeInsetsGeometry>('padding', buttonPadding, defaultValue: null));
     properties.add(FlagProperty(
         'buttonAlignedDropdown',
         value: buttonAlignedDropdown,
         ifTrue: 'dropdown width matches button',
         defaultValue: null));
     properties.add(DiagnosticsProperty<ButtonBarLayoutBehavior>('layoutBehavior', layoutBehavior, defaultValue: null));
     properties.add(DiagnosticsProperty<VerticalDirection>('overflowDirection', overflowDirection, defaultValue: null));
   }
 }

 /// Applies a button bar theme to descendant [ButtonBar] widgets.
 ///
 /// A button bar theme describes the layout and properties for the buttons
 /// contained in a [ButtonBar].
 ///
 /// Descendant widgets obtain the current theme's [ButtonBarTheme] object using
 /// [ButtonBarTheme.of]. When a widget uses [ButtonBarTheme.of], it is automatically
 /// rebuilt if the theme later changes.
 ///
 /// A button bar theme can be specified as part of the overall Material theme
 /// using [ThemeData.buttonBarTheme].
 ///
 /// See also:
 ///
 ///  * [ButtonBarThemeData], which describes the actual configuration of a button
 ///    bar theme.
 class ButtonBarTheme extends InheritedWidget {
   /// Constructs a button bar theme that configures all descendent [ButtonBar]
   /// widgets.
   ///
   /// The [data] must not be null.
   const ButtonBarTheme({
     Key key,
     @required this.data,
     Widget child,
   }) : assert(data != null), super(key: key, child: child);

   /// The properties used for all descendant [ButtonBar] widgets.
   final ButtonBarThemeData data;

   /// Returns the configuration [data] from the closest [ButtonBarTheme]
   /// ancestor. If there is no ancestor, it returns [ThemeData.buttonBarTheme].
   /// Applications can assume that the returned value will not be null.
   ///
   /// Typical usage is as follows:
   ///
   /// ```dart
   /// ButtonBarThemeData theme = ButtonBarTheme.of(context);
   /// ```
   static ButtonBarThemeData of(BuildContext context) {
     final ButtonBarTheme buttonBarTheme = context.dependOnInheritedWidgetOfExactType<ButtonBarTheme>();
     return buttonBarTheme?.data ?? Theme.of(context).buttonBarTheme;
   }

   @override
   bool updateShouldNotify(ButtonBarTheme oldWidget) => data != oldWidget.data;
 }
	// 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:ui' show lerpDouble;

	import 'package:flutter/foundation.dart';
	import 'package:flutter/widgets.dart';

	import 'button_theme.dart';
	import 'theme.dart';

	/// Defines the visual properties of [ButtonBar] widgets.
	///
	/// Used by [ButtonBarTheme] to control the visual properties of [ButtonBar]
	/// instances in a widget subtree.
	///
	/// To obtain this configuration, use [ButtonBarTheme.of] to access the closest
	/// ancestor [ButtonBarTheme] of the current [BuildContext].
	///
	/// See also:
	///
	/// * [ButtonBarTheme], an [InheritedWidget] that propagates the theme down
	/// its subtree.
	/// * [ButtonBar], which uses this to configure itself and its children
	/// button widgets.
	class ButtonBarThemeData with Diagnosticable {
	/// Constructs the set of properties used to configure [ButtonBar] widgets.
	///
	/// Both [buttonMinWidth] and [buttonHeight] must be non-negative if they
	/// are not null.
	const ButtonBarThemeData({
	this.alignment,
	this.mainAxisSize,
	this.buttonTextTheme,
	this.buttonMinWidth,
	this.buttonHeight,
	this.buttonPadding,
	this.buttonAlignedDropdown,
	this.layoutBehavior,
	this.overflowDirection,
	}) : assert(buttonMinWidth == null \|\| buttonMinWidth >= 0.0),
	assert(buttonHeight == null \|\| buttonHeight >= 0.0);

	/// How the children should be placed along the horizontal axis.
	final MainAxisAlignment alignment;

	/// How much horizontal space is available. See [Row.mainAxisSize].
	final MainAxisSize mainAxisSize;

	/// Defines a [ButtonBar] button's base colors, and the defaults for
	/// the button's minimum size, internal padding, and shape.
	///
	/// This will override the surrounding [ButtonTheme.textTheme] setting
	/// for buttons contained in the [ButtonBar].
	///
	/// Despite the name, this property is not a [TextTheme], its value is not a
	/// collection of [TextStyle]s.
	final ButtonTextTheme buttonTextTheme;

	/// The minimum width for [ButtonBar] buttons.
	///
	/// This will override the surrounding [ButtonTheme.minWidth] setting
	/// for buttons contained in the [ButtonBar].
	///
	/// The actual horizontal space allocated for a button's child is
	/// at least this value less the theme's horizontal [padding].
	final double buttonMinWidth;

	/// The minimum height for [ButtonBar] buttons.
	///
	/// This will override the surrounding [ButtonTheme.height] setting
	/// for buttons contained in the [ButtonBar].
	final double buttonHeight;

	/// Padding for a [ButtonBar] button's child (typically the button's label).
	///
	/// This will override the surrounding [ButtonTheme.padding] setting
	/// for buttons contained in the [ButtonBar].
	final EdgeInsetsGeometry buttonPadding;

	/// If true, then a [DropdownButton] menu's width will match the [ButtonBar]
	/// button's width.
	///
	/// If false, then the dropdown's menu will be wider than
	/// its button. In either case the dropdown button will line up the leading
	/// edge of the menu's value with the leading edge of the values
	/// displayed by the menu items.
	///
	/// This will override the surrounding [ButtonTheme.alignedDropdown] setting
	/// for buttons contained in the [ButtonBar].
	///
	/// This property only affects [DropdownButton] contained in a [ButtonBar]
	/// and its menu.
	final bool buttonAlignedDropdown;

	/// Defines whether a [ButtonBar] should size itself with a minimum size
	/// constraint or with padding.
	final ButtonBarLayoutBehavior layoutBehavior;

	/// Defines the vertical direction of a [ButtonBar]'s children if it
	/// overflows.
	///
	/// If the [ButtonBar]'s children do not fit into a single row, then they
	/// are arranged in a column. The first action is at the top of the
	/// column if this property is set to [VerticalDirection.down], since it
	/// "starts" at the top and "ends" at the bottom. On the other hand,
	/// the first action will be at the bottom of the column if this
	/// property is set to [VerticalDirection.up], since it "starts" at the
	/// bottom and "ends" at the top.
	final VerticalDirection overflowDirection;

	/// Creates a copy of this object but with the given fields replaced with the
	/// new values.
	ButtonBarThemeData copyWith({
	MainAxisAlignment alignment,
	MainAxisSize mainAxisSize,
	ButtonTextTheme buttonTextTheme,
	double buttonMinWidth,
	double buttonHeight,
	EdgeInsetsGeometry buttonPadding,
	bool buttonAlignedDropdown,
	ButtonBarLayoutBehavior layoutBehavior,
	VerticalDirection overflowDirection,
	}) {
	return ButtonBarThemeData(
	alignment: alignment ?? this.alignment,
	mainAxisSize: mainAxisSize ?? this.mainAxisSize,
	buttonTextTheme: buttonTextTheme ?? this.buttonTextTheme,
	buttonMinWidth: buttonMinWidth ?? this.buttonMinWidth,
	buttonHeight: buttonHeight ?? this.buttonHeight,
	buttonPadding: buttonPadding ?? this.buttonPadding,
	buttonAlignedDropdown: buttonAlignedDropdown ?? this.buttonAlignedDropdown,
	layoutBehavior: layoutBehavior ?? this.layoutBehavior,
	overflowDirection: overflowDirection ?? this.overflowDirection,
	);
	}

	/// Linearly interpolate between two button bar themes.
	///
	/// If both arguments are null, then null is returned.
	///
	/// {@macro dart.ui.shadow.lerp}
	static ButtonBarThemeData lerp(ButtonBarThemeData a, ButtonBarThemeData b, double t) {
	assert(t != null);
	if (a == null && b == null)
	return null;
	return ButtonBarThemeData(
	alignment: t < 0.5 ? a.alignment : b.alignment,
	mainAxisSize: t < 0.5 ? a.mainAxisSize : b.mainAxisSize,
	buttonTextTheme: t < 0.5 ? a.buttonTextTheme : b.buttonTextTheme,
	buttonMinWidth: lerpDouble(a?.buttonMinWidth, b?.buttonMinWidth, t),
	buttonHeight: lerpDouble(a?.buttonHeight, b?.buttonHeight, t),
	buttonPadding: EdgeInsetsGeometry.lerp(a?.buttonPadding, b?.buttonPadding, t),
	buttonAlignedDropdown: t < 0.5 ? a.buttonAlignedDropdown : b.buttonAlignedDropdown,
	layoutBehavior: t < 0.5 ? a.layoutBehavior : b.layoutBehavior,
	overflowDirection: t < 0.5 ? a.overflowDirection : b.overflowDirection,
	);
	}

	@override
	int get hashCode {
	return hashValues(
	alignment,
	mainAxisSize,
	buttonTextTheme,
	buttonMinWidth,
	buttonHeight,
	buttonPadding,
	buttonAlignedDropdown,
	layoutBehavior,
	overflowDirection,
	);
	}

	@override
	bool operator ==(Object other) {
	if (identical(this, other))
	return true;
	if (other.runtimeType != runtimeType)
	return false;
	return other is ButtonBarThemeData
	&& other.alignment == alignment
	&& other.mainAxisSize == mainAxisSize
	&& other.buttonTextTheme == buttonTextTheme
	&& other.buttonMinWidth == buttonMinWidth
	&& other.buttonHeight == buttonHeight
	&& other.buttonPadding == buttonPadding
	&& other.buttonAlignedDropdown == buttonAlignedDropdown
	&& other.layoutBehavior == layoutBehavior
	&& other.overflowDirection == overflowDirection;
	}

	@override
	void debugFillProperties(DiagnosticPropertiesBuilder properties) {
	super.debugFillProperties(properties);
	properties.add(DiagnosticsProperty<MainAxisAlignment>('alignment', alignment, defaultValue: null));
	properties.add(DiagnosticsProperty<MainAxisSize>('mainAxisSize', mainAxisSize, defaultValue: null));
	properties.add(DiagnosticsProperty<ButtonTextTheme>('textTheme', buttonTextTheme, defaultValue: null));
	properties.add(DoubleProperty('minWidth', buttonMinWidth, defaultValue: null));
	properties.add(DoubleProperty('height', buttonHeight, defaultValue: null));
	properties.add(DiagnosticsProperty<EdgeInsetsGeometry>('padding', buttonPadding, defaultValue: null));
	properties.add(FlagProperty(
	'buttonAlignedDropdown',
	value: buttonAlignedDropdown,
	ifTrue: 'dropdown width matches button',
	defaultValue: null));
	properties.add(DiagnosticsProperty<ButtonBarLayoutBehavior>('layoutBehavior', layoutBehavior, defaultValue: null));
	properties.add(DiagnosticsProperty<VerticalDirection>('overflowDirection', overflowDirection, defaultValue: null));
	}
	}

	/// Applies a button bar theme to descendant [ButtonBar] widgets.
	///
	/// A button bar theme describes the layout and properties for the buttons
	/// contained in a [ButtonBar].
	///
	/// Descendant widgets obtain the current theme's [ButtonBarTheme] object using
	/// [ButtonBarTheme.of]. When a widget uses [ButtonBarTheme.of], it is automatically
	/// rebuilt if the theme later changes.
	///
	/// A button bar theme can be specified as part of the overall Material theme
	/// using [ThemeData.buttonBarTheme].
	///
	/// See also:
	///
	/// * [ButtonBarThemeData], which describes the actual configuration of a button
	/// bar theme.
	class ButtonBarTheme extends InheritedWidget {
	/// Constructs a button bar theme that configures all descendent [ButtonBar]
	/// widgets.
	///
	/// The [data] must not be null.
	const ButtonBarTheme({
	Key key,
	@required this.data,
	Widget child,
	}) : assert(data != null), super(key: key, child: child);

	/// The properties used for all descendant [ButtonBar] widgets.
	final ButtonBarThemeData data;

	/// Returns the configuration [data] from the closest [ButtonBarTheme]
	/// ancestor. If there is no ancestor, it returns [ThemeData.buttonBarTheme].
	/// Applications can assume that the returned value will not be null.
	///
	/// Typical usage is as follows:
	///
	/// ```dart
	/// ButtonBarThemeData theme = ButtonBarTheme.of(context);
	/// ```
	static ButtonBarThemeData of(BuildContext context) {
	final ButtonBarTheme buttonBarTheme = context.dependOnInheritedWidgetOfExactType<ButtonBarTheme>();
	return buttonBarTheme?.data ?? Theme.of(context).buttonBarTheme;
	}

	@override
	bool updateShouldNotify(ButtonBarTheme oldWidget) => data != oldWidget.data;
	}