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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:ui' show lerpDouble;
import 'package:flutter/foundation.dart';
import 'package:flutter/rendering.dart';
/// Defines default property values for [BottomSheet]'s [Material].
/// Descendant widgets obtain the current [BottomSheetThemeData] object
/// using `Theme.of(context).bottomSheetTheme`. Instances of
/// [BottomSheetThemeData] can be customized with
/// [BottomSheetThemeData.copyWith].
/// Typically a [BottomSheetThemeData] is specified as part of the
/// overall [Theme] with [ThemeData.bottomSheetTheme].
/// All [BottomSheetThemeData] properties are `null` by default.
/// When null, the [BottomSheet] will provide its own defaults.
/// See also:
/// * [ThemeData], which describes the overall theme information for the
/// application.
class BottomSheetThemeData with Diagnosticable {
/// Creates a theme that can be used for [ThemeData.bottomSheetTheme].
const BottomSheetThemeData({
/// Default value for [BottomSheet.backgroundColor].
/// If null, [BottomSheet] defaults to [Material]'s default.
final Color? backgroundColor;
/// Default value for [BottomSheet.elevation].
/// {@macro flutter.material.material.elevation}
/// If null, [BottomSheet] defaults to 0.0.
final double? elevation;
/// Value for [BottomSheet.backgroundColor] when the Bottom sheet is presented
/// as a modal bottom sheet.
final Color? modalBackgroundColor;
/// Value for [BottomSheet.elevation] when the Bottom sheet is presented as a
/// modal bottom sheet.
final double? modalElevation;
/// Default value for [BottomSheet.shape].
/// If null, no overriding shape is specified for [BottomSheet], so the
/// [BottomSheet] is rectangular.
final ShapeBorder? shape;
/// Default value for [BottomSheet.clipBehavior].
/// If null, [BottomSheet] uses [Clip.none].
final Clip? clipBehavior;
/// Creates a copy of this object with the given fields replaced with the
/// new values.
BottomSheetThemeData copyWith({
Color? backgroundColor,
double? elevation,
Color? modalBackgroundColor,
double? modalElevation,
ShapeBorder? shape,
Clip? clipBehavior,
}) {
return BottomSheetThemeData(
backgroundColor: backgroundColor ?? this.backgroundColor,
elevation: elevation ?? this.elevation,
modalBackgroundColor: modalBackgroundColor ?? this.modalBackgroundColor,
modalElevation: modalElevation ?? this.modalElevation,
shape: shape ?? this.shape,
clipBehavior: clipBehavior ?? this.clipBehavior,
/// Linearly interpolate between two bottom sheet themes.
/// If both arguments are null then null is returned.
/// {@macro dart.ui.shadow.lerp}
static BottomSheetThemeData? lerp(BottomSheetThemeData? a, BottomSheetThemeData? b, double t) {
assert(t != null);
if (a == null && b == null)
return null;
return BottomSheetThemeData(
backgroundColor: Color.lerp(a?.backgroundColor, b?.backgroundColor, t),
elevation: lerpDouble(a?.elevation, b?.elevation, t),
modalBackgroundColor: Color.lerp(a?.modalBackgroundColor, b?.modalBackgroundColor, t),
modalElevation: lerpDouble(a?.modalElevation, b?.modalElevation, t),
shape: ShapeBorder.lerp(a?.shape, b?.shape, t),
clipBehavior: t < 0.5 ? a?.clipBehavior : b?.clipBehavior,
int get hashCode {
return hashValues(
bool operator ==(Object other) {
if (identical(this, other))
return true;
if (other.runtimeType != runtimeType)
return false;
return other is BottomSheetThemeData
&& other.backgroundColor == backgroundColor
&& other.elevation == elevation
&& other.modalBackgroundColor == modalBackgroundColor
&& other.modalElevation == modalElevation
&& other.shape == shape
&& other.clipBehavior == clipBehavior;
void debugFillProperties(DiagnosticPropertiesBuilder properties) {
properties.add(ColorProperty('backgroundColor', backgroundColor, defaultValue: null));
properties.add(DoubleProperty('elevation', elevation, defaultValue: null));
properties.add(ColorProperty('modalBackgroundColor', modalBackgroundColor, defaultValue: null));
properties.add(DoubleProperty('modalElevation', modalElevation, defaultValue: null));
properties.add(DiagnosticsProperty<ShapeBorder>('shape', shape, defaultValue: null));
properties.add(DiagnosticsProperty<Clip>('clipBehavior', clipBehavior, defaultValue: null));