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[animations] Remove copy of curves (#182)

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This commit is contained in:
Michael Goderbauer
2020-07-27 22:40:08 -07:00
committed by GitHub
parent 987d168062
commit 837b1a321d
3 changed files with 30 additions and 71 deletions
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6
packages/animations/lib/src/fade_scale_transition.dart
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@ -2,13 +2,15 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
import 'package:flutter/material.dart'
hide decelerateEasing; // ignore: undefined_hidden_name
// TODO(goderbauer): Remove implementation import when material properly exports the file.
import 'package:flutter/src/material/curves.dart'; // ignore: implementation_imports
// TODO(shihaohong): Remove DualTransitionBuilder once flutter/flutter's `stable`
// branch contains DualTransitionBuilder.
import 'dual_transition_builder.dart' as dual_transition_builder;
import 'modal.dart';
import 'utils/curves.dart';
/// The modal transition configuration for a Material fade transition.
///

29
packages/animations/lib/src/shared_axis_transition.dart
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@ -4,13 +4,18 @@
import 'package:flutter/animation.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/material.dart'
hide
decelerateEasing, // ignore: undefined_hidden_name
standardEasing, // ignore: undefined_hidden_name
accelerateEasing; // ignore: undefined_hidden_name
// TODO(goderbauer): Remove implementation import when material properly exports the file.
import 'package:flutter/src/material/curves.dart'; // ignore: implementation_imports
import 'package:flutter/widgets.dart';
// TODO(shihaohong): Remove DualTransitionBuilder once flutter/flutter's `stable`
// branch contains DualTransitionBuilder.
import 'dual_transition_builder.dart' as dual_transition_builder;
import 'utils/curves.dart';
/// Determines which type of shared axis transition is used.
enum SharedAxisTransitionType {
@ -398,7 +403,7 @@ class _ExitTransition extends StatelessWidget {
final Color fillColor;
final Widget child;
static final Animatable<double> _fadeOutTransition = FlippedCurveTween(
static final Animatable<double> _fadeOutTransition = _FlippedCurveTween(
curve: accelerateEasing,
).chain(CurveTween(curve: const Interval(0.0, 0.3)));
@ -478,3 +483,21 @@ class _ExitTransition extends StatelessWidget {
return null; // unreachable
}
}
/// Enables creating a flipped [CurveTween].
///
/// This creates a [CurveTween] that evaluates to a result that flips the
/// tween vertically.
///
/// This tween sequence assumes that the evaluated result has to be a double
/// between 0.0 and 1.0.
class _FlippedCurveTween extends CurveTween {
/// Creates a vertically flipped [CurveTween].
_FlippedCurveTween({
@required Curve curve,
}) : assert(curve != null),
super(curve: curve);
@override
double transform(double t) => 1.0 - super.transform(t);
}

66
packages/animations/lib/src/utils/curves.dart
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@ -1,66 +0,0 @@
// Copyright 2019 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 'package:flutter/animation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
// The easing curves of the Material Library
/// The standard easing curve in the Material specification.
///
/// Elements that begin and end at rest use standard easing.
/// They speed up quickly and slow down gradually, in order
/// to emphasize the end of the transition.
///
/// See also:
/// * <https://material.io/design/motion/speed.html#easing>
const Curve standardEasing = Cubic(0.4, 0.0, 0.2, 1);
/// The accelerate easing curve in the Material specification.
///
/// Elements exiting a screen use acceleration easing,
/// where they start at rest and end at peak velocity.
///
/// See also:
/// * <https://material.io/design/motion/speed.html#easing>
const Curve accelerateEasing = Cubic(0.4, 0.0, 1.0, 1.0);
/// The decelerate easing curve in the Material specification.
///
/// Incoming elements are animated using deceleration easing,
/// which starts a transition at peak velocity (the fastest
/// point of an element’s movement) and ends at rest.
///
/// See also:
/// * <https://material.io/design/motion/speed.html#easing>
const Curve decelerateEasing = Cubic(0.0, 0.0, 0.2, 1.0);
// A tween that starts from 1.0 and ends at 0.0.
final Tween<double> _flippedTween = Tween<double>(
begin: 1.0,
end: 0.0,
);
/// Enables creating a flipped [CurveTween].
///
/// This creates a [CurveTween] that evaluates to a result that flips the
/// tween vertically.
///
/// This tween sequence assumes that the evaluated result has to be a double
/// between 0.0 and 1.0.
class FlippedCurveTween extends CurveTween {
/// Creates a vertically flipped [CurveTween].
FlippedCurveTween({
@required Curve curve,
}) : assert(curve != null),
super(curve: curve);
@override
double transform(double t) => 1.0 - super.transform(t);
}
/// Flips the incoming passed in [Animation] to start from 1.0 and end at 0.0.
Animation<double> flipTween(Animation<double> animation) {
return _flippedTween.animate(animation);
}