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13bec286bd
- Introduces the ability to control whether RawMagnifier uses a clip on its decoration. (It still has to use a clip for its magnified image.) - Uses `BlurStyle.outer` to remove the clip for CupertinoMagnifier. - Many changes to the documentation around magnifiers and shadows. - Implements `BoxShadow.copyWith` which somehow we had never needed before. - Makes `debugDisableShadows` handle `BlurStyle.outer` correctly. - Adds `MagnifierInfo.toString`. - Aligns various `operator ==`s with the style guide. - Makes MagnifierDecoration a separate concept from Decoration, since it's not actually compatible anywhere. - Removes some dead code and makes other minor code simplifications. - Uses double syntax rather than integer syntax for various double literals for clarity. I expect one minor golden image change (antialiasing change on Cupertino's magnifier test).
104 lines
5.0 KiB
Dart
104 lines
5.0 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 'package:flutter/painting.dart';
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// Based on https://material.io/design/environment/elevation.html
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// Currently, only the elevation values that are bound to one or more widgets are
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// defined here.
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/// Map of elevation offsets used by Material Design to [BoxShadow] definitions.
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///
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/// The following elevations have defined shadows: 1, 2, 3, 4, 6, 8, 9, 12, 16, 24.
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///
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/// Each entry has three shadows which must be combined to obtain the defined
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/// effect for that elevation.
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///
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/// This is useful when simulating a shadow with a [BoxDecoration] or other
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/// class that uses a list of [BoxShadow] objects.
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///
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/// Shadows defined by [kElevationToShadow] use [BlurStyle.normal]. To convert a
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/// shadow from [kElevationToShadow] to use a different [BlurStyle] (e.g. to use
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/// it in a [MagnifierDecoration]), consider an expression such as the
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/// following:
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///
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/// ```dart
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/// kElevationToShadow[12]!.map((BoxShadow shadow) => shadow.copyWith(blurStyle: BlurStyle.outer)).toList(),
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/// ```
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///
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/// See also:
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///
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/// * [Material], which takes an arbitrary double for its elevation and generates
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/// a shadow dynamically.
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/// * <https://material.io/design/environment/elevation.html>
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const Map<int, List<BoxShadow>> kElevationToShadow = _elevationToShadow; // to hide the literal from the docs
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const Color _kKeyUmbraOpacity = Color(0x33000000); // alpha = 0.2
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const Color _kKeyPenumbraOpacity = Color(0x24000000); // alpha = 0.14
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const Color _kAmbientShadowOpacity = Color(0x1F000000); // alpha = 0.12
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const Map<int, List<BoxShadow>> _elevationToShadow = <int, List<BoxShadow>>{
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// The empty list depicts no elevation.
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0: <BoxShadow>[],
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1: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 2.0), blurRadius: 1.0, spreadRadius: -1.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 1.0), blurRadius: 1.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 1.0), blurRadius: 3.0, color: _kAmbientShadowOpacity),
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],
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2: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 3.0), blurRadius: 1.0, spreadRadius: -2.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 2.0), blurRadius: 2.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 1.0), blurRadius: 5.0, color: _kAmbientShadowOpacity),
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],
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3: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 3.0), blurRadius: 3.0, spreadRadius: -2.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 3.0), blurRadius: 4.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 1.0), blurRadius: 8.0, color: _kAmbientShadowOpacity),
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],
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4: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 2.0), blurRadius: 4.0, spreadRadius: -1.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 4.0), blurRadius: 5.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 1.0), blurRadius: 10.0, color: _kAmbientShadowOpacity),
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],
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6: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 3.0), blurRadius: 5.0, spreadRadius: -1.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 6.0), blurRadius: 10.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 1.0), blurRadius: 18.0, color: _kAmbientShadowOpacity),
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],
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8: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 5.0), blurRadius: 5.0, spreadRadius: -3.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 8.0), blurRadius: 10.0, spreadRadius: 1.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 3.0), blurRadius: 14.0, spreadRadius: 2.0, color: _kAmbientShadowOpacity),
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],
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9: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 5.0), blurRadius: 6.0, spreadRadius: -3.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 9.0), blurRadius: 12.0, spreadRadius: 1.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 3.0), blurRadius: 16.0, spreadRadius: 2.0, color: _kAmbientShadowOpacity),
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],
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12: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 7.0), blurRadius: 8.0, spreadRadius: -4.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 12.0), blurRadius: 17.0, spreadRadius: 2.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 5.0), blurRadius: 22.0, spreadRadius: 4.0, color: _kAmbientShadowOpacity),
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],
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16: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 8.0), blurRadius: 10.0, spreadRadius: -5.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 16.0), blurRadius: 24.0, spreadRadius: 2.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 6.0), blurRadius: 30.0, spreadRadius: 5.0, color: _kAmbientShadowOpacity),
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],
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24: <BoxShadow>[
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BoxShadow(offset: Offset(0.0, 11.0), blurRadius: 15.0, spreadRadius: -7.0, color: _kKeyUmbraOpacity),
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BoxShadow(offset: Offset(0.0, 24.0), blurRadius: 38.0, spreadRadius: 3.0, color: _kKeyPenumbraOpacity),
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BoxShadow(offset: Offset(0.0, 9.0), blurRadius: 46.0, spreadRadius: 8.0, color: _kAmbientShadowOpacity),
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],
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};
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