ink_ripple.dart 8.72 KB
Newer Older
Ian Hickson's avatar
Ian Hickson committed
1
// Copyright 2014 The Flutter Authors. All rights reserved.
2 3 4 5 6 7 8 9 10 11
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:math' as math;

import 'package:flutter/widgets.dart';

import 'ink_well.dart';
import 'material.dart';

12 13 14 15 16
const Duration _kUnconfirmedRippleDuration = Duration(seconds: 1);
const Duration _kFadeInDuration = Duration(milliseconds: 75);
const Duration _kRadiusDuration = Duration(milliseconds: 225);
const Duration _kFadeOutDuration = Duration(milliseconds: 375);
const Duration _kCancelDuration = Duration(milliseconds: 75);
17

18 19
// The fade out begins 225ms after the _fadeOutController starts. See confirm().
const double _kFadeOutIntervalStart = 225.0 / 375.0;
20

21
RectCallback? _getClipCallback(RenderBox referenceBox, bool containedInkWell, RectCallback? rectCallback) {
22 23 24 25
  if (rectCallback != null) {
    assert(containedInkWell);
    return rectCallback;
  }
26
  if (containedInkWell) {
27
    return () => Offset.zero & referenceBox.size;
28
  }
29 30 31
  return null;
}

32
double _getTargetRadius(RenderBox referenceBox, bool containedInkWell, RectCallback? rectCallback, Offset position) {
33 34 35 36
  final Size size = rectCallback != null ? rectCallback().size : referenceBox.size;
  final double d1 = size.bottomRight(Offset.zero).distance;
  final double d2 = (size.topRight(Offset.zero) - size.bottomLeft(Offset.zero)).distance;
  return math.max(d1, d2) / 2.0;
37 38 39 40 41 42 43
}

class _InkRippleFactory extends InteractiveInkFeatureFactory {
  const _InkRippleFactory();

  @override
  InteractiveInkFeature create({
44 45 46 47 48
    required MaterialInkController controller,
    required RenderBox referenceBox,
    required Offset position,
    required Color color,
    required TextDirection textDirection,
49
    bool containedInkWell = false,
50 51 52 53 54
    RectCallback? rectCallback,
    BorderRadius? borderRadius,
    ShapeBorder? customBorder,
    double? radius,
    VoidCallback? onRemoved,
55
  }) {
56
    return InkRipple(
57 58 59 60 61 62 63
      controller: controller,
      referenceBox: referenceBox,
      position: position,
      color: color,
      containedInkWell: containedInkWell,
      rectCallback: rectCallback,
      borderRadius: borderRadius,
64
      customBorder: customBorder,
65 66
      radius: radius,
      onRemoved: onRemoved,
67
      textDirection: textDirection,
68 69 70 71 72 73 74 75 76 77 78 79 80
    );
  }
}

/// A visual reaction on a piece of [Material] to user input.
///
/// A circular ink feature whose origin starts at the input touch point and
/// whose radius expands from 60% of the final radius. The splash origin
/// animates to the center of its [referenceBox].
///
/// This object is rarely created directly. Instead of creating an ink ripple,
/// consider using an [InkResponse] or [InkWell] widget, which uses
/// gestures (such as tap and long-press) to trigger ink splashes. This class
81
/// is used when the [Theme]'s [ThemeData.splashFactory] is [InkRipple.splashFactory].
82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
///
/// See also:
///
///  * [InkSplash], which is an ink splash feature that expands less
///    aggressively than the ripple.
///  * [InkResponse], which uses gestures to trigger ink highlights and ink
///    splashes in the parent [Material].
///  * [InkWell], which is a rectangular [InkResponse] (the most common type of
///    ink response).
///  * [Material], which is the widget on which the ink splash is painted.
///  * [InkHighlight], which is an ink feature that emphasizes a part of a
///    [Material].
class InkRipple extends InteractiveInkFeature {
  /// Begin a ripple, centered at [position] relative to [referenceBox].
  ///
  /// The [controller] argument is typically obtained via
  /// `Material.of(context)`.
  ///
  /// If [containedInkWell] is true, then the ripple will be sized to fit
  /// the well rectangle, then clipped to it when drawn. The well
  /// rectangle is the box returned by [rectCallback], if provided, or
  /// otherwise is the bounds of the [referenceBox].
  ///
  /// If [containedInkWell] is false, then [rectCallback] should be null.
  /// The ink ripple is clipped only to the edges of the [Material].
  /// This is the default.
  ///
  /// When the ripple is removed, [onRemoved] will be called.
  InkRipple({
111
    required MaterialInkController controller,
112
    required super.referenceBox,
113 114 115
    required Offset position,
    required Color color,
    required TextDirection textDirection,
116
    bool containedInkWell = false,
117 118
    RectCallback? rectCallback,
    BorderRadius? borderRadius,
119
    super.customBorder,
120
    double? radius,
121
    super.onRemoved,
122
  }) : _position = position,
123
       _borderRadius = borderRadius ?? BorderRadius.zero,
124
       _textDirection = textDirection,
125 126
       _targetRadius = radius ?? _getTargetRadius(referenceBox, containedInkWell, rectCallback, position),
       _clipCallback = _getClipCallback(referenceBox, containedInkWell, rectCallback),
127
       super(controller: controller, color: color) {
128 129

    // Immediately begin fading-in the initial splash.
130
    _fadeInController = AnimationController(duration: _kFadeInDuration, vsync: controller.vsync)
131 132
      ..addListener(controller.markNeedsPaint)
      ..forward();
133
    _fadeIn = _fadeInController.drive(IntTween(
134 135
      begin: 0,
      end: color.alpha,
136
    ));
137 138

    // Controls the splash radius and its center. Starts upon confirm.
139
    _radiusController = AnimationController(duration: _kUnconfirmedRippleDuration, vsync: controller.vsync)
140 141
      ..addListener(controller.markNeedsPaint)
      ..forward();
Josh Soref's avatar
Josh Soref committed
142
     // Initial splash diameter is 60% of the target diameter, final
143
     // diameter is 10dps larger than the target diameter.
144 145 146 147 148
    _radius = _radiusController.drive(
      Tween<double>(
        begin: _targetRadius * 0.30,
        end: _targetRadius + 5.0,
      ).chain(_easeCurveTween),
149 150 151 152
    );

    // Controls the splash radius and its center. Starts upon confirm however its
    // Interval delays changes until the radius expansion has completed.
153
    _fadeOutController = AnimationController(duration: _kFadeOutDuration, vsync: controller.vsync)
154 155
      ..addListener(controller.markNeedsPaint)
      ..addStatusListener(_handleAlphaStatusChanged);
156 157 158 159 160
    _fadeOut = _fadeOutController.drive(
      IntTween(
        begin: color.alpha,
        end: 0,
      ).chain(_fadeOutIntervalTween),
161 162 163 164 165 166 167 168
    );

    controller.addInkFeature(this);
  }

  final Offset _position;
  final BorderRadius _borderRadius;
  final double _targetRadius;
169
  final RectCallback? _clipCallback;
170
  final TextDirection _textDirection;
171

172 173
  late Animation<double> _radius;
  late AnimationController _radiusController;
174

175 176
  late Animation<int> _fadeIn;
  late AnimationController _fadeInController;
177

178 179
  late Animation<int> _fadeOut;
  late AnimationController _fadeOutController;
180

181 182
  /// Used to specify this type of ink splash for an [InkWell], [InkResponse],
  /// material [Theme], or [ButtonStyle].
183 184 185 186 187
  static const InteractiveInkFeatureFactory splashFactory = _InkRippleFactory();

  static final Animatable<double> _easeCurveTween = CurveTween(curve: Curves.ease);
  static final Animatable<double> _fadeOutIntervalTween = CurveTween(curve: const Interval(_kFadeOutIntervalStart, 1.0));

188 189 190 191 192
  @override
  void confirm() {
    _radiusController
      ..duration = _kRadiusDuration
      ..forward();
Josh Soref's avatar
Josh Soref committed
193
    // This confirm may have been preceded by a cancel.
194
    _fadeInController.forward();
195
    _fadeOutController.animateTo(1.0, duration: _kFadeOutDuration);
196 197 198 199 200
  }

  @override
  void cancel() {
    _fadeInController.stop();
201 202
    // Watch out: setting _fadeOutController's value to 1.0 will
    // trigger a call to _handleAlphaStatusChanged() which will
203
    // dispose _fadeOutController.
204 205
    final double fadeOutValue = 1.0 - _fadeInController.value;
    _fadeOutController.value = fadeOutValue;
206
    if (fadeOutValue < 1.0) {
207
      _fadeOutController.animateTo(1.0, duration: _kCancelDuration);
208
    }
209 210 211
  }

  void _handleAlphaStatusChanged(AnimationStatus status) {
212
    if (status == AnimationStatus.completed) {
213
      dispose();
214
    }
215 216 217 218 219 220 221 222 223 224 225 226 227
  }

  @override
  void dispose() {
    _radiusController.dispose();
    _fadeInController.dispose();
    _fadeOutController.dispose();
    super.dispose();
  }

  @override
  void paintFeature(Canvas canvas, Matrix4 transform) {
    final int alpha = _fadeInController.isAnimating ? _fadeIn.value : _fadeOut.value;
228
    final Paint paint = Paint()..color = color.withAlpha(alpha);
229 230 231 232
    Rect? rect;
    if (_clipCallback != null) {
       rect = _clipCallback!();
    }
233 234 235
    // Splash moves to the center of the reference box.
    final Offset center = Offset.lerp(
      _position,
236
      rect != null ? rect.center : referenceBox.size.center(Offset.zero),
237
      Curves.ease.transform(_radiusController.value),
238
    )!;
239 240 241 242 243 244 245
    paintInkCircle(
      canvas: canvas,
      transform: transform,
      paint: paint,
      center: center,
      textDirection: _textDirection,
      radius: _radius.value,
246
      customBorder: customBorder,
247 248 249
      borderRadius: _borderRadius,
      clipCallback: _clipCallback,
    );
250 251
  }
}