forked from flutter/packages
-
Notifications
You must be signed in to change notification settings - Fork 1
/
shared_axis_transition.dart
480 lines (447 loc) · 14.4 KB
/
shared_axis_transition.dart
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
// Copyright 2013 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/material.dart';
/// Determines which type of shared axis transition is used.
enum SharedAxisTransitionType {
/// Creates a shared axis vertical (y-axis) page transition.
vertical,
/// Creates a shared axis horizontal (x-axis) page transition.
horizontal,
/// Creates a shared axis scaled (z-axis) page transition.
scaled,
}
/// Used by [PageTransitionsTheme] to define a page route transition animation
/// in which outgoing and incoming elements share a fade transition.
///
/// The shared axis pattern provides the transition animation between UI elements
/// that have a spatial or navigational relationship. For example,
/// transitioning from one page of a sign up page to the next one.
///
/// The following example shows how the SharedAxisPageTransitionsBuilder can
/// be used in a [PageTransitionsTheme] to change the default transitions
/// of [MaterialPageRoute]s.
///
/// ```dart
/// MaterialApp(
/// theme: ThemeData(
/// pageTransitionsTheme: PageTransitionsTheme(
/// builders: {
/// TargetPlatform.android: SharedAxisPageTransitionsBuilder(
/// transitionType: SharedAxisTransitionType.horizontal,
/// ),
/// TargetPlatform.iOS: SharedAxisPageTransitionsBuilder(
/// transitionType: SharedAxisTransitionType.horizontal,
/// ),
/// },
/// ),
/// ),
/// routes: {
/// '/': (BuildContext context) {
/// return Container(
/// color: Colors.red,
/// child: Center(
/// child: ElevatedButton(
/// child: Text('Push route'),
/// onPressed: () {
/// Navigator.of(context).pushNamed('/a');
/// },
/// ),
/// ),
/// );
/// },
/// '/a' : (BuildContext context) {
/// return Container(
/// color: Colors.blue,
/// child: Center(
/// child: ElevatedButton(
/// child: Text('Pop route'),
/// onPressed: () {
/// Navigator.of(context).pop();
/// },
/// ),
/// ),
/// );
/// },
/// },
/// );
/// ```
class SharedAxisPageTransitionsBuilder extends PageTransitionsBuilder {
/// Construct a [SharedAxisPageTransitionsBuilder].
const SharedAxisPageTransitionsBuilder({
required this.transitionType,
this.fillColor,
});
/// Determines which [SharedAxisTransitionType] to build.
final SharedAxisTransitionType transitionType;
/// The color to use for the background color during the transition.
///
/// This defaults to the [Theme]'s [ThemeData.canvasColor].
final Color? fillColor;
@override
Widget buildTransitions<T>(
PageRoute<T>? route,
BuildContext? context,
Animation<double> animation,
Animation<double> secondaryAnimation,
Widget child,
) {
return SharedAxisTransition(
animation: animation,
secondaryAnimation: secondaryAnimation,
transitionType: transitionType,
fillColor: fillColor,
child: child,
);
}
}
/// Defines a transition in which outgoing and incoming elements share a fade
/// transition.
///
/// The shared axis pattern provides the transition animation between UI elements
/// that have a spatial or navigational relationship. For example,
/// transitioning from one page of a sign up page to the next one.
///
/// Consider using [SharedAxisTransition] within a
/// [PageTransitionsTheme] if you want to apply this kind of transition to
/// [MaterialPageRoute] transitions within a Navigator (see
/// [SharedAxisPageTransitionsBuilder] for example code).
///
/// This transition can also be used directly in a
/// [PageTransitionSwitcher.transitionBuilder] to transition
/// from one widget to another as seen in the following example:
///
/// ```dart
/// int _selectedIndex = 0;
///
/// final List<Color> _colors = [Colors.white, Colors.red, Colors.yellow];
///
/// @override
/// Widget build(BuildContext context) {
/// return Scaffold(
/// appBar: AppBar(
/// title: const Text('Page Transition Example'),
/// ),
/// body: PageTransitionSwitcher(
/// // reverse: true, // uncomment to see transition in reverse
/// transitionBuilder: (
/// Widget child,
/// Animation<double> primaryAnimation,
/// Animation<double> secondaryAnimation,
/// ) {
/// return SharedAxisTransition(
/// animation: primaryAnimation,
/// secondaryAnimation: secondaryAnimation,
/// transitionType: SharedAxisTransitionType.horizontal,
/// child: child,
/// );
/// },
/// child: Container(
/// key: ValueKey<int>(_selectedIndex),
/// color: _colors[_selectedIndex],
/// child: Center(
/// child: FlutterLogo(size: 300),
/// )
/// ),
/// ),
/// bottomNavigationBar: BottomNavigationBar(
/// items: const <BottomNavigationBarItem>[
/// BottomNavigationBarItem(
/// icon: Icon(Icons.home),
/// title: Text('White'),
/// ),
/// BottomNavigationBarItem(
/// icon: Icon(Icons.business),
/// title: Text('Red'),
/// ),
/// BottomNavigationBarItem(
/// icon: Icon(Icons.school),
/// title: Text('Yellow'),
/// ),
/// ],
/// currentIndex: _selectedIndex,
/// onTap: (int index) {
/// setState(() {
/// _selectedIndex = index;
/// });
/// },
/// ),
/// );
/// }
/// ```
class SharedAxisTransition extends StatelessWidget {
/// Creates a [SharedAxisTransition].
///
/// The [animation] and [secondaryAnimation] argument are required and must
/// not be null.
const SharedAxisTransition({
super.key,
required this.animation,
required this.secondaryAnimation,
required this.transitionType,
this.fillColor,
this.child,
});
/// The animation that drives the [child]'s entrance and exit.
///
/// See also:
///
/// * [TransitionRoute.animate], which is the value given to this property
/// when it is used as a page transition.
final Animation<double> animation;
/// The animation that transitions [child] when new content is pushed on top
/// of it.
///
/// See also:
///
/// * [TransitionRoute.secondaryAnimation], which is the value given to this
/// property when the it is used as a page transition.
final Animation<double> secondaryAnimation;
/// Determines which type of shared axis transition is used.
///
/// See also:
///
/// * [SharedAxisTransitionType], which defines and describes all shared
/// axis transition types.
final SharedAxisTransitionType transitionType;
/// The color to use for the background color during the transition.
///
/// This defaults to the [Theme]'s [ThemeData.canvasColor].
final Color? fillColor;
/// The widget below this widget in the tree.
///
/// This widget will transition in and out as driven by [animation] and
/// [secondaryAnimation].
final Widget? child;
@override
Widget build(BuildContext context) {
final Color color = fillColor ?? Theme.of(context).canvasColor;
return DualTransitionBuilder(
animation: animation,
forwardBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return _EnterTransition(
animation: animation,
transitionType: transitionType,
child: child,
);
},
reverseBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return _ExitTransition(
animation: animation,
transitionType: transitionType,
reverse: true,
fillColor: color,
child: child,
);
},
child: DualTransitionBuilder(
animation: ReverseAnimation(secondaryAnimation),
forwardBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return _EnterTransition(
animation: animation,
transitionType: transitionType,
reverse: true,
child: child,
);
},
reverseBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return _ExitTransition(
animation: animation,
transitionType: transitionType,
fillColor: color,
child: child,
);
},
child: child,
),
);
}
}
class _EnterTransition extends StatelessWidget {
const _EnterTransition({
required this.animation,
required this.transitionType,
this.reverse = false,
this.child,
});
final Animation<double> animation;
final SharedAxisTransitionType transitionType;
final Widget? child;
final bool reverse;
static final Animatable<double> _fadeInTransition = CurveTween(
curve: decelerateEasing,
).chain(CurveTween(curve: const Interval(0.3, 1.0)));
static final Animatable<double> _scaleDownTransition = Tween<double>(
begin: 1.10,
end: 1.00,
).chain(CurveTween(curve: standardEasing));
static final Animatable<double> _scaleUpTransition = Tween<double>(
begin: 0.80,
end: 1.00,
).chain(CurveTween(curve: standardEasing));
@override
Widget build(BuildContext context) {
switch (transitionType) {
case SharedAxisTransitionType.horizontal:
final Animatable<Offset> slideInTransition = Tween<Offset>(
begin: Offset(!reverse ? 30.0 : -30.0, 0.0),
end: Offset.zero,
).chain(CurveTween(curve: standardEasing));
return FadeTransition(
opacity: _fadeInTransition.animate(animation),
child: AnimatedBuilder(
animation: animation,
builder: (BuildContext context, Widget? child) {
return Transform.translate(
offset: slideInTransition.evaluate(animation),
child: child,
);
},
child: child,
),
);
case SharedAxisTransitionType.vertical:
final Animatable<Offset> slideInTransition = Tween<Offset>(
begin: Offset(0.0, !reverse ? 30.0 : -30.0),
end: Offset.zero,
).chain(CurveTween(curve: standardEasing));
return FadeTransition(
opacity: _fadeInTransition.animate(animation),
child: AnimatedBuilder(
animation: animation,
builder: (BuildContext context, Widget? child) {
return Transform.translate(
offset: slideInTransition.evaluate(animation),
child: child,
);
},
child: child,
),
);
case SharedAxisTransitionType.scaled:
return FadeTransition(
opacity: _fadeInTransition.animate(animation),
child: ScaleTransition(
scale: (!reverse ? _scaleUpTransition : _scaleDownTransition)
.animate(animation),
child: child,
),
);
}
}
}
class _ExitTransition extends StatelessWidget {
const _ExitTransition({
required this.animation,
required this.transitionType,
this.reverse = false,
required this.fillColor,
this.child,
});
final Animation<double> animation;
final SharedAxisTransitionType transitionType;
final bool reverse;
final Color fillColor;
final Widget? child;
static final Animatable<double> _fadeOutTransition = _FlippedCurveTween(
curve: accelerateEasing,
).chain(CurveTween(curve: const Interval(0.0, 0.3)));
static final Animatable<double> _scaleUpTransition = Tween<double>(
begin: 1.00,
end: 1.10,
).chain(CurveTween(curve: standardEasing));
static final Animatable<double> _scaleDownTransition = Tween<double>(
begin: 1.00,
end: 0.80,
).chain(CurveTween(curve: standardEasing));
@override
Widget build(BuildContext context) {
switch (transitionType) {
case SharedAxisTransitionType.horizontal:
final Animatable<Offset> slideOutTransition = Tween<Offset>(
begin: Offset.zero,
end: Offset(!reverse ? -30.0 : 30.0, 0.0),
).chain(CurveTween(curve: standardEasing));
return FadeTransition(
opacity: _fadeOutTransition.animate(animation),
child: Container(
color: fillColor,
child: AnimatedBuilder(
animation: animation,
builder: (BuildContext context, Widget? child) {
return Transform.translate(
offset: slideOutTransition.evaluate(animation),
child: child,
);
},
child: child,
),
),
);
case SharedAxisTransitionType.vertical:
final Animatable<Offset> slideOutTransition = Tween<Offset>(
begin: Offset.zero,
end: Offset(0.0, !reverse ? -30.0 : 30.0),
).chain(CurveTween(curve: standardEasing));
return FadeTransition(
opacity: _fadeOutTransition.animate(animation),
child: Container(
color: fillColor,
child: AnimatedBuilder(
animation: animation,
builder: (BuildContext context, Widget? child) {
return Transform.translate(
offset: slideOutTransition.evaluate(animation),
child: child,
);
},
child: child,
),
),
);
case SharedAxisTransitionType.scaled:
return FadeTransition(
opacity: _fadeOutTransition.animate(animation),
child: Container(
color: fillColor,
child: ScaleTransition(
scale: (!reverse ? _scaleUpTransition : _scaleDownTransition)
.animate(animation),
child: child,
),
),
);
}
}
}
/// 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 super.curve,
});
@override
double transform(double t) => 1.0 - super.transform(t);
}