// 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/rendering.dart'; import 'package:flutter/widgets.dart'; import 'theme.dart'; /// Defines default property values for descendant [Drawer] widgets. /// /// Descendant widgets obtain the current [DrawerThemeData] object /// using `DrawerTheme.of(context)`. Instances of [DrawerThemeData] can be /// customized with [DrawerThemeData.copyWith]. /// /// Typically a [DrawerThemeData] is specified as part of the /// overall [Theme] with [ThemeData.drawerTheme]. /// /// All [DrawerThemeData] properties are `null` by default. /// /// See also: /// /// * [DrawerTheme], an [InheritedWidget] that propagates the theme down its /// subtree. /// * [ThemeData], which describes the overall theme information for the /// application and can customize a drawer using [ThemeData.drawerTheme]. @immutable class DrawerThemeData with Diagnosticable { /// Creates a theme that can be used for [ThemeData.drawerTheme] and /// [DrawerTheme]. const DrawerThemeData({ this.backgroundColor, this.scrimColor, this.elevation, this.shape, this.width, }); /// Overrides the default value of [Drawer.backgroundColor]. final Color? backgroundColor; /// Overrides the default value of [DrawerController.scrimColor]. final Color? scrimColor; /// Overrides the default value of [Drawer.elevation]. final double? elevation; /// Overrides the default value of [Drawer.shape]. final ShapeBorder? shape; /// Overrides the default value of [Drawer.width]. final double? width; /// Creates a copy of this object with the given fields replaced with the /// new values. DrawerThemeData copyWith({ Color? backgroundColor, Color? scrimColor, double? elevation, ShapeBorder? shape, double? width, }) { return DrawerThemeData( backgroundColor: backgroundColor ?? this.backgroundColor, scrimColor: scrimColor ?? this.scrimColor, elevation: elevation ?? this.elevation, shape: shape ?? this.shape, width: width ?? this.width, ); } /// Linearly interpolate between two drawer themes. /// /// If both arguments are null then null is returned. /// /// {@macro dart.ui.shadow.lerp} static DrawerThemeData? lerp(DrawerThemeData? a, DrawerThemeData? b, double t) { assert(t != null); if (a == null && b == null) { return null; } return DrawerThemeData( backgroundColor: Color.lerp(a?.backgroundColor, b?.backgroundColor, t), scrimColor: Color.lerp(a?.scrimColor, b?.scrimColor, t), elevation: lerpDouble(a?.elevation, b?.elevation, t), shape: ShapeBorder.lerp(a?.shape, b?.shape, t), width: lerpDouble(a?.width, b?.width, t), ); } @override int get hashCode => Object.hash( backgroundColor, scrimColor, elevation, shape, width, ); @override bool operator ==(Object other) { if (identical(this, other)) { return true; } if (other.runtimeType != runtimeType) { return false; } return other is DrawerThemeData && other.backgroundColor == backgroundColor && other.scrimColor == scrimColor && other.elevation == elevation && other.shape == shape && other.width == width; } @override void debugFillProperties(DiagnosticPropertiesBuilder properties) { super.debugFillProperties(properties); properties.add(ColorProperty('backgroundColor', backgroundColor, defaultValue: null)); properties.add(ColorProperty('scrimColor', scrimColor, defaultValue: null)); properties.add(DoubleProperty('elevation', elevation, defaultValue: null)); properties.add(DiagnosticsProperty<ShapeBorder>('shape', shape, defaultValue: null)); properties.add(DoubleProperty('width', width, defaultValue: null)); } } /// An inherited widget that defines visual properties for [Drawer]s in this /// widget's subtree. /// /// Values specified here are used for [Drawer] properties that are not /// given an explicit non-null value. /// /// Using this would allow you to override the [ThemeData.drawerTheme]. class DrawerTheme extends InheritedTheme { /// Creates a theme that defines the [DrawerThemeData] properties for a /// [Drawer]. const DrawerTheme({ super.key, required this.data, required super.child, }) : assert(data != null); /// Specifies the background color, scrim color, elevation, and shape for /// descendant [Drawer] widgets. final DrawerThemeData data; /// The closest instance of this class that encloses the given context. /// /// If there is no enclosing [DrawerTheme] widget, then /// [ThemeData.drawerTheme] is used. /// /// Typical usage is as follows: /// /// ```dart /// DrawerThemeData theme = DrawerTheme.of(context); /// ``` static DrawerThemeData of(BuildContext context) { final DrawerTheme? drawerTheme = context.dependOnInheritedWidgetOfExactType<DrawerTheme>(); return drawerTheme?.data ?? Theme.of(context).drawerTheme; } @override Widget wrap(BuildContext context, Widget child) { return DrawerTheme(data: data, child: child); } @override bool updateShouldNotify(DrawerTheme oldWidget) => data != oldWidget.data; }