/
platform_views.dart
1144 lines (986 loc) · 42.4 KB
/
platform_views.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
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// 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:typed_data';
import 'dart:ui';
import 'package:flutter/foundation.dart';
import 'package:flutter/gestures.dart';
import 'message_codec.dart';
import 'system_channels.dart';
/// Converts a given point from the global coordinate system in logical pixels
/// to the local coordinate system for a box.
///
/// Used by [AndroidViewController.pointTransformer].
typedef PointTransformer = Offset Function(Offset position);
/// The [PlatformViewsRegistry] responsible for generating unique identifiers for platform views.
final PlatformViewsRegistry platformViewsRegistry = PlatformViewsRegistry._instance();
/// A registry responsible for generating unique identifier for platform views.
///
/// A Flutter application has a single [PlatformViewsRegistry] which can be accesses
/// through the [platformViewsRegistry] getter.
class PlatformViewsRegistry {
PlatformViewsRegistry._instance();
// Always non-negative. The id value -1 is used in the accessibility bridge
// to indicate the absence of a platform view.
int _nextPlatformViewId = 0;
/// Allocates a unique identifier for a platform view.
///
/// A platform view identifier can refer to a platform view that was never created,
/// a platform view that was disposed, or a platform view that is alive.
///
/// Typically a platform view identifier is passed to a platform view widget
/// which creates the platform view and manages its lifecycle.
int getNextPlatformViewId() => _nextPlatformViewId++;
}
/// Callback signature for when a platform view was created.
///
/// `id` is the platform view's unique identifier.
typedef PlatformViewCreatedCallback = void Function(int id);
/// Provides access to the platform views service.
///
/// This service allows creating and controlling platform-specific views.
class PlatformViewsService {
PlatformViewsService._() {
SystemChannels.platform_views.setMethodCallHandler(_onMethodCall);
}
static final PlatformViewsService _instance = PlatformViewsService._();
Future<void> _onMethodCall(MethodCall call) {
switch(call.method) {
case 'viewFocused':
final int id = call.arguments as int;
if (_focusCallbacks.containsKey(id)) {
_focusCallbacks[id]!();
}
break;
default:
throw UnimplementedError("${call.method} was invoked but isn't implemented by PlatformViewsService");
}
return Future<void>.value();
}
/// Maps platform view IDs to focus callbacks.
///
/// The callbacks are invoked when the platform view asks to be focused.
final Map<int, VoidCallback> _focusCallbacks = <int, VoidCallback>{};
/// Creates a [TextureAndroidViewController] for a new Android view.
///
/// The view is created after calling [TextureAndroidViewController.setSize].
///
/// `id` is an unused unique identifier generated with [platformViewsRegistry].
///
/// `viewType` is the identifier of the Android view type to be created, a
/// factory for this view type must have been registered on the platform side.
/// Platform view factories are typically registered by plugin code.
/// Plugins can register a platform view factory with
/// [PlatformViewRegistry#registerViewFactory](/javadoc/io/flutter/plugin/platform/PlatformViewRegistry.html#registerViewFactory-java.lang.String-io.flutter.plugin.platform.PlatformViewFactory-).
///
/// `creationParams` will be passed as the args argument of [PlatformViewFactory#create](/javadoc/io/flutter/plugin/platform/PlatformViewFactory.html#create-android.content.Context-int-java.lang.Object-)
///
/// `creationParamsCodec` is the codec used to encode `creationParams` before sending it to the
/// platform side. It should match the codec passed to the constructor of [PlatformViewFactory](/javadoc/io/flutter/plugin/platform/PlatformViewFactory.html#PlatformViewFactory-io.flutter.plugin.common.MessageCodec-).
/// This is typically one of: [StandardMessageCodec], [JSONMessageCodec], [StringCodec], or [BinaryCodec].
///
/// `onFocus` is a callback that will be invoked when the Android View asks to get the
/// input focus.
///
/// The Android view will only be created after [AndroidViewController.setSize] is called for the
/// first time.
///
/// The `id, `viewType, and `layoutDirection` parameters must not be null.
/// If `creationParams` is non null then `creationParamsCodec` must not be null.
static TextureAndroidViewController initAndroidView({
required int id,
required String viewType,
required TextDirection layoutDirection,
dynamic creationParams,
MessageCodec<dynamic>? creationParamsCodec,
VoidCallback? onFocus,
}) {
assert(id != null);
assert(viewType != null);
assert(layoutDirection != null);
assert(creationParams == null || creationParamsCodec != null);
final TextureAndroidViewController controller = TextureAndroidViewController._(
viewId: id,
viewType: viewType,
layoutDirection: layoutDirection,
creationParams: creationParams,
creationParamsCodec: creationParamsCodec,
);
_instance._focusCallbacks[id] = onFocus ?? () {};
return controller;
}
/// Creates a [SurfaceAndroidViewController] for a new Android view.
///
/// The view is created after calling [AndroidViewController.create].
///
/// `id` is an unused unique identifier generated with [platformViewsRegistry].
///
/// `viewType` is the identifier of the Android view type to be created, a
/// factory for this view type must have been registered on the platform side.
/// Platform view factories are typically registered by plugin code.
/// Plugins can register a platform view factory with
/// [PlatformViewRegistry#registerViewFactory](/javadoc/io/flutter/plugin/platform/PlatformViewRegistry.html#registerViewFactory-java.lang.String-io.flutter.plugin.platform.PlatformViewFactory-).
///
/// `creationParams` will be passed as the args argument of [PlatformViewFactory#create](/javadoc/io/flutter/plugin/platform/PlatformViewFactory.html#create-android.content.Context-int-java.lang.Object-)
///
/// `creationParamsCodec` is the codec used to encode `creationParams` before sending it to the
/// platform side. It should match the codec passed to the constructor of [PlatformViewFactory](/javadoc/io/flutter/plugin/platform/PlatformViewFactory.html#PlatformViewFactory-io.flutter.plugin.common.MessageCodec-).
/// This is typically one of: [StandardMessageCodec], [JSONMessageCodec], [StringCodec], or [BinaryCodec].
///
/// `onFocus` is a callback that will be invoked when the Android View asks to get the
/// input focus.
///
/// The Android view will only be created after [AndroidViewController.setSize] is called for the
/// first time.
///
/// The `id, `viewType, and `layoutDirection` parameters must not be null.
/// If `creationParams` is non null then `creationParamsCodec` must not be null.
static SurfaceAndroidViewController initSurfaceAndroidView({
required int id,
required String viewType,
required TextDirection layoutDirection,
dynamic creationParams,
MessageCodec<dynamic>? creationParamsCodec,
VoidCallback? onFocus,
}) {
assert(id != null);
assert(viewType != null);
assert(layoutDirection != null);
assert(creationParams == null || creationParamsCodec != null);
final SurfaceAndroidViewController controller = SurfaceAndroidViewController._(
viewId: id,
viewType: viewType,
layoutDirection: layoutDirection,
creationParams: creationParams,
creationParamsCodec: creationParamsCodec,
);
_instance._focusCallbacks[id] = onFocus ?? () {};
return controller;
}
// TODO(amirh): reference the iOS plugin API for registering a UIView factory once it lands.
/// This is work in progress, not yet ready to be used, and requires a custom engine build. Creates a controller for a new iOS UIView.
///
/// `id` is an unused unique identifier generated with [platformViewsRegistry].
///
/// `viewType` is the identifier of the iOS view type to be created, a
/// factory for this view type must have been registered on the platform side.
/// Platform view factories are typically registered by plugin code.
///
/// The `id, `viewType, and `layoutDirection` parameters must not be null.
/// If `creationParams` is non null then `creationParamsCodec` must not be null.
static Future<UiKitViewController> initUiKitView({
required int id,
required String viewType,
required TextDirection layoutDirection,
dynamic creationParams,
MessageCodec<dynamic>? creationParamsCodec,
}) async {
assert(id != null);
assert(viewType != null);
assert(layoutDirection != null);
assert(creationParams == null || creationParamsCodec != null);
// TODO(amirh): pass layoutDirection once the system channel supports it.
final Map<String, dynamic> args = <String, dynamic>{
'id': id,
'viewType': viewType,
};
if (creationParams != null) {
final ByteData paramsByteData = creationParamsCodec!.encodeMessage(creationParams)!;
args['params'] = Uint8List.view(
paramsByteData.buffer,
0,
paramsByteData.lengthInBytes,
);
}
await SystemChannels.platform_views.invokeMethod<void>('create', args);
return UiKitViewController._(id, layoutDirection);
}
}
/// Properties of an Android pointer.
///
/// A Dart version of Android's [MotionEvent.PointerProperties](https://developer.android.com/reference/android/view/MotionEvent.PointerProperties).
class AndroidPointerProperties {
/// Creates an AndroidPointerProperties.
///
/// All parameters must not be null.
const AndroidPointerProperties({
required this.id,
required this.toolType,
}) : assert(id != null),
assert(toolType != null);
/// See Android's [MotionEvent.PointerProperties#id](https://developer.android.com/reference/android/view/MotionEvent.PointerProperties.html#id).
final int id;
/// The type of tool used to make contact such as a finger or stylus, if known.
/// See Android's [MotionEvent.PointerProperties#toolType](https://developer.android.com/reference/android/view/MotionEvent.PointerProperties.html#toolType).
final int toolType;
/// Value for `toolType` when the tool type is unknown.
static const int kToolTypeUnknown = 0;
/// Value for `toolType` when the tool type is a finger.
static const int kToolTypeFinger = 1;
/// Value for `toolType` when the tool type is a stylus.
static const int kToolTypeStylus = 2;
/// Value for `toolType` when the tool type is a mouse.
static const int kToolTypeMouse = 3;
/// Value for `toolType` when the tool type is an eraser.
static const int kToolTypeEraser = 4;
List<int> _asList() => <int>[id, toolType];
@override
String toString() {
return 'AndroidPointerProperties(id: $id, toolType: $toolType)';
}
}
/// Position information for an Android pointer.
///
/// A Dart version of Android's [MotionEvent.PointerCoords](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords).
class AndroidPointerCoords {
/// Creates an AndroidPointerCoords.
///
/// All parameters must not be null.
const AndroidPointerCoords({
required this.orientation,
required this.pressure,
required this.size,
required this.toolMajor,
required this.toolMinor,
required this.touchMajor,
required this.touchMinor,
required this.x,
required this.y,
}) : assert(orientation != null),
assert(pressure != null),
assert(size != null),
assert(toolMajor != null),
assert(toolMinor != null),
assert(touchMajor != null),
assert(touchMinor != null),
assert(x != null),
assert(y != null);
/// The orientation of the touch area and tool area in radians clockwise from vertical.
///
/// See Android's [MotionEvent.PointerCoords#orientation](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#orientation).
final double orientation;
/// A normalized value that describes the pressure applied to the device by a finger or other tool.
///
/// See Android's [MotionEvent.PointerCoords#pressure](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#pressure).
final double pressure;
/// A normalized value that describes the approximate size of the pointer touch area in relation to the maximum detectable size of the device.
///
/// See Android's [MotionEvent.PointerCoords#size](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#size).
final double size;
/// See Android's [MotionEvent.PointerCoords#toolMajor](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#toolMajor).
final double toolMajor;
/// See Android's [MotionEvent.PointerCoords#toolMinor](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#toolMinor).
final double toolMinor;
/// See Android's [MotionEvent.PointerCoords#touchMajor](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#touchMajor).
final double touchMajor;
/// See Android's [MotionEvent.PointerCoords#touchMinor](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#touchMinor).
final double touchMinor;
/// The X component of the pointer movement.
///
/// See Android's [MotionEvent.PointerCoords#x](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#x).
final double x;
/// The Y component of the pointer movement.
///
/// See Android's [MotionEvent.PointerCoords#y](https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#y).
final double y;
List<double> _asList() {
return <double>[
orientation,
pressure,
size,
toolMajor,
toolMinor,
touchMajor,
touchMinor,
x,
y,
];
}
@override
String toString() {
return 'AndroidPointerCoords(orientation: $orientation, pressure: $pressure, size: $size, toolMajor: $toolMajor, toolMinor: $toolMinor, touchMajor: $touchMajor, touchMinor: $touchMinor, x: $x, y: $y)';
}
}
/// A Dart version of Android's [MotionEvent](https://developer.android.com/reference/android/view/MotionEvent).
class AndroidMotionEvent {
/// Creates an AndroidMotionEvent.
///
/// All parameters must not be null.
AndroidMotionEvent({
required this.downTime,
required this.eventTime,
required this.action,
required this.pointerCount,
required this.pointerProperties,
required this.pointerCoords,
required this.metaState,
required this.buttonState,
required this.xPrecision,
required this.yPrecision,
required this.deviceId,
required this.edgeFlags,
required this.source,
required this.flags,
required this.motionEventId,
}) : assert(downTime != null),
assert(eventTime != null),
assert(action != null),
assert(pointerCount != null),
assert(pointerProperties != null),
assert(pointerCoords != null),
assert(metaState != null),
assert(buttonState != null),
assert(xPrecision != null),
assert(yPrecision != null),
assert(deviceId != null),
assert(edgeFlags != null),
assert(source != null),
assert(flags != null),
assert(pointerProperties.length == pointerCount),
assert(pointerCoords.length == pointerCount);
/// The time (in ms) when the user originally pressed down to start a stream of position events,
/// relative to an arbitrary timeline.
///
/// See Android's [MotionEvent#getDownTime](https://developer.android.com/reference/android/view/MotionEvent.html#getDownTime()).
final int downTime;
/// The time this event occurred, relative to an arbitrary timeline.
///
/// See Android's [MotionEvent#getEventTime](https://developer.android.com/reference/android/view/MotionEvent.html#getEventTime()).
final int eventTime;
/// A value representing the kind of action being performed.
///
/// See Android's [MotionEvent#getAction](https://developer.android.com/reference/android/view/MotionEvent.html#getAction()).
final int action;
/// The number of pointers that are part of this event.
/// This must be equivalent to the length of `pointerProperties` and `pointerCoords`.
///
/// See Android's [MotionEvent#getPointerCount](https://developer.android.com/reference/android/view/MotionEvent.html#getPointerCount()).
final int pointerCount;
/// List of [AndroidPointerProperties] for each pointer that is part of this event.
final List<AndroidPointerProperties> pointerProperties;
/// List of [AndroidPointerCoords] for each pointer that is part of this event.
final List<AndroidPointerCoords> pointerCoords;
/// The state of any meta / modifier keys that were in effect when the event was generated.
///
/// See Android's [MotionEvent#getMetaState](https://developer.android.com/reference/android/view/MotionEvent.html#getMetaState()).
final int metaState;
/// The state of all buttons that are pressed such as a mouse or stylus button.
///
/// See Android's [MotionEvent#getButtonState](https://developer.android.com/reference/android/view/MotionEvent.html#getButtonState()).
final int buttonState;
/// The precision of the X coordinates being reported, in physical pixels.
///
/// See Android's [MotionEvent#getXPrecision](https://developer.android.com/reference/android/view/MotionEvent.html#getXPrecision()).
final double xPrecision;
/// The precision of the Y coordinates being reported, in physical pixels.
///
/// See Android's [MotionEvent#getYPrecision](https://developer.android.com/reference/android/view/MotionEvent.html#getYPrecision()).
final double yPrecision;
/// See Android's [MotionEvent#getDeviceId](https://developer.android.com/reference/android/view/MotionEvent.html#getDeviceId()).
final int deviceId;
/// A bit field indicating which edges, if any, were touched by this MotionEvent.
///
/// See Android's [MotionEvent#getEdgeFlags](https://developer.android.com/reference/android/view/MotionEvent.html#getEdgeFlags()).
final int edgeFlags;
/// The source of this event (e.g a touchpad or stylus).
///
/// See Android's [MotionEvent#getSource](https://developer.android.com/reference/android/view/MotionEvent.html#getSource()).
final int source;
/// See Android's [MotionEvent#getFlags](https://developer.android.com/reference/android/view/MotionEvent.html#getFlags()).
final int flags;
/// Used to identify this [MotionEvent](https://developer.android.com/reference/android/view/MotionEvent.html) uniquely in the Flutter Engine.
final int motionEventId;
List<dynamic> _asList(int viewId) {
return <dynamic>[
viewId,
downTime,
eventTime,
action,
pointerCount,
pointerProperties.map<List<int>>((AndroidPointerProperties p) => p._asList()).toList(),
pointerCoords.map<List<double>>((AndroidPointerCoords p) => p._asList()).toList(),
metaState,
buttonState,
xPrecision,
yPrecision,
deviceId,
edgeFlags,
source,
flags,
motionEventId,
];
}
@override
String toString() {
return 'AndroidPointerEvent(downTime: $downTime, eventTime: $eventTime, action: $action, pointerCount: $pointerCount, pointerProperties: $pointerProperties, pointerCoords: $pointerCoords, metaState: $metaState, buttonState: $buttonState, xPrecision: $xPrecision, yPrecision: $yPrecision, deviceId: $deviceId, edgeFlags: $edgeFlags, source: $source, flags: $flags)';
}
}
enum _AndroidViewState {
waitingForSize,
creating,
created,
disposed,
}
// Helper for converting PointerEvents into AndroidMotionEvents.
class _AndroidMotionEventConverter {
_AndroidMotionEventConverter();
final Map<int, AndroidPointerCoords> pointerPositions =
<int, AndroidPointerCoords>{};
final Map<int, AndroidPointerProperties> pointerProperties =
<int, AndroidPointerProperties>{};
final Set<int> usedAndroidPointerIds = <int>{};
late PointTransformer _pointTransformer;
set pointTransformer(PointTransformer transformer) {
assert(transformer != null);
_pointTransformer = transformer;
}
int? downTimeMillis;
void handlePointerDownEvent(PointerDownEvent event) {
if (pointerProperties.isEmpty) {
downTimeMillis = event.timeStamp.inMilliseconds;
}
int androidPointerId = 0;
while (usedAndroidPointerIds.contains(androidPointerId)) {
androidPointerId++;
}
usedAndroidPointerIds.add(androidPointerId);
pointerProperties[event.pointer] = propertiesFor(event, androidPointerId);
}
void updatePointerPositions(PointerEvent event) {
final Offset position = _pointTransformer(event.position);
pointerPositions[event.pointer] = AndroidPointerCoords(
orientation: event.orientation,
pressure: event.pressure,
size: event.size,
toolMajor: event.radiusMajor,
toolMinor: event.radiusMinor,
touchMajor: event.radiusMajor,
touchMinor: event.radiusMinor,
x: position.dx,
y: position.dy,
);
}
void handlePointerUpEvent(PointerUpEvent event) {
pointerPositions.remove(event.pointer);
usedAndroidPointerIds.remove(pointerProperties[event.pointer]!.id);
pointerProperties.remove(event.pointer);
if (pointerProperties.isEmpty) {
downTimeMillis = null;
}
}
void handlePointerCancelEvent(PointerCancelEvent event) {
pointerPositions.clear();
pointerProperties.clear();
usedAndroidPointerIds.clear();
downTimeMillis = null;
}
AndroidMotionEvent? toAndroidMotionEvent(PointerEvent event) {
final List<int> pointers = pointerPositions.keys.toList();
final int pointerIdx = pointers.indexOf(event.pointer);
final int numPointers = pointers.length;
// This value must match the value in engine's FlutterView.java.
// This flag indicates whether the original Android pointer events were batched together.
const int kPointerDataFlagBatched = 1;
// Android MotionEvent objects can batch information on multiple pointers.
// Flutter breaks these such batched events into multiple PointerEvent objects.
// When there are multiple active pointers we accumulate the information for all pointers
// as we get PointerEvents, and only send it to the embedded Android view when
// we see the last pointer. This way we achieve the same batching as Android.
if (event.platformData == kPointerDataFlagBatched ||
(isSinglePointerAction(event) && pointerIdx < numPointers - 1)) {
return null;
}
final int action;
if (event is PointerDownEvent) {
action = numPointers == 1
? AndroidViewController.kActionDown
: AndroidViewController.pointerAction(
pointerIdx, AndroidViewController.kActionPointerDown);
} else if (event is PointerUpEvent) {
action = numPointers == 1
? AndroidViewController.kActionUp
: AndroidViewController.pointerAction(
pointerIdx, AndroidViewController.kActionPointerUp);
} else if (event is PointerMoveEvent) {
action = AndroidViewController.kActionMove;
} else if (event is PointerCancelEvent) {
action = AndroidViewController.kActionCancel;
} else {
return null;
}
return AndroidMotionEvent(
downTime: downTimeMillis!,
eventTime: event.timeStamp.inMilliseconds,
action: action,
pointerCount: pointerPositions.length,
pointerProperties: pointers
.map<AndroidPointerProperties>((int i) => pointerProperties[i]!)
.toList(),
pointerCoords: pointers
.map<AndroidPointerCoords>((int i) => pointerPositions[i]!)
.toList(),
metaState: 0,
buttonState: 0,
xPrecision: 1.0,
yPrecision: 1.0,
deviceId: 0,
edgeFlags: 0,
source: 0,
flags: 0,
motionEventId: event.embedderId,
);
}
AndroidPointerProperties propertiesFor(PointerEvent event, int pointerId) {
int toolType = AndroidPointerProperties.kToolTypeUnknown;
switch (event.kind) {
case PointerDeviceKind.touch:
toolType = AndroidPointerProperties.kToolTypeFinger;
break;
case PointerDeviceKind.mouse:
toolType = AndroidPointerProperties.kToolTypeMouse;
break;
case PointerDeviceKind.stylus:
toolType = AndroidPointerProperties.kToolTypeStylus;
break;
case PointerDeviceKind.invertedStylus:
toolType = AndroidPointerProperties.kToolTypeEraser;
break;
case PointerDeviceKind.unknown:
toolType = AndroidPointerProperties.kToolTypeUnknown;
break;
}
return AndroidPointerProperties(id: pointerId, toolType: toolType);
}
bool isSinglePointerAction(PointerEvent event) =>
event is! PointerDownEvent && event is! PointerUpEvent;
}
/// Controls an Android view.
///
/// Typically created with [PlatformViewsService.initAndroidView].
// TODO(bparrishMines): Remove abstract methods that are not required by all subclasses.
abstract class AndroidViewController extends PlatformViewController {
AndroidViewController._({
required this.viewId,
required String viewType,
required TextDirection layoutDirection,
dynamic creationParams,
MessageCodec<dynamic>? creationParamsCodec,
bool waitingForSize = false,
}) : assert(viewId != null),
assert(viewType != null),
assert(layoutDirection != null),
assert(creationParams == null || creationParamsCodec != null),
_viewType = viewType,
_layoutDirection = layoutDirection,
_creationParams = creationParams,
_creationParamsCodec = creationParamsCodec,
_state = waitingForSize
? _AndroidViewState.waitingForSize
: _AndroidViewState.creating;
/// Action code for when a primary pointer touched the screen.
///
/// Android's [MotionEvent.ACTION_DOWN](https://developer.android.com/reference/android/view/MotionEvent#ACTION_DOWN)
static const int kActionDown = 0;
/// Action code for when a primary pointer stopped touching the screen.
///
/// Android's [MotionEvent.ACTION_UP](https://developer.android.com/reference/android/view/MotionEvent#ACTION_UP)
static const int kActionUp = 1;
/// Action code for when the event only includes information about pointer movement.
///
/// Android's [MotionEvent.ACTION_MOVE](https://developer.android.com/reference/android/view/MotionEvent#ACTION_MOVE)
static const int kActionMove = 2;
/// Action code for when a motion event has been canceled.
///
/// Android's [MotionEvent.ACTION_CANCEL](https://developer.android.com/reference/android/view/MotionEvent#ACTION_CANCEL)
static const int kActionCancel = 3;
/// Action code for when a secondary pointer touched the screen.
///
/// Android's [MotionEvent.ACTION_POINTER_DOWN](https://developer.android.com/reference/android/view/MotionEvent#ACTION_POINTER_DOWN)
static const int kActionPointerDown = 5;
/// Action code for when a secondary pointer stopped touching the screen.
///
/// Android's [MotionEvent.ACTION_POINTER_UP](https://developer.android.com/reference/android/view/MotionEvent#ACTION_POINTER_UP)
static const int kActionPointerUp = 6;
/// Android's [View.LAYOUT_DIRECTION_LTR](https://developer.android.com/reference/android/view/View.html#LAYOUT_DIRECTION_LTR) value.
static const int kAndroidLayoutDirectionLtr = 0;
/// Android's [View.LAYOUT_DIRECTION_RTL](https://developer.android.com/reference/android/view/View.html#LAYOUT_DIRECTION_RTL) value.
static const int kAndroidLayoutDirectionRtl = 1;
/// The unique identifier of the Android view controlled by this controller.
@override
final int viewId;
final String _viewType;
// Helps convert PointerEvents to AndroidMotionEvents.
final _AndroidMotionEventConverter _motionEventConverter =
_AndroidMotionEventConverter();
TextDirection _layoutDirection;
_AndroidViewState _state;
final dynamic _creationParams;
final MessageCodec<dynamic>? _creationParamsCodec;
final List<PlatformViewCreatedCallback> _platformViewCreatedCallbacks =
<PlatformViewCreatedCallback>[];
static int _getAndroidDirection(TextDirection direction) {
assert(direction != null);
switch (direction) {
case TextDirection.ltr:
return kAndroidLayoutDirectionLtr;
case TextDirection.rtl:
return kAndroidLayoutDirectionRtl;
}
}
/// Creates a masked Android MotionEvent action value for an indexed pointer.
static int pointerAction(int pointerId, int action) {
return ((pointerId << 8) & 0xff00) | (action & 0xff);
}
Future<void> _sendDisposeMessage();
Future<void> _sendCreateMessage();
/// Creates the Android View.
///
/// Throws an [AssertionError] if view was already disposed.
Future<void> create() async {
assert(_state != _AndroidViewState.disposed, 'trying to create a disposed Android view');
await _sendCreateMessage();
_state = _AndroidViewState.created;
for (final PlatformViewCreatedCallback callback in _platformViewCreatedCallbacks) {
callback(viewId);
}
}
/// Sizes the Android View.
///
/// `size` is the view's new size in logical pixel, it must not be null and must
/// be bigger than zero.
///
/// The first time a size is set triggers the creation of the Android view.
Future<void> setSize(Size size);
/// Returns the texture entry id that the Android view is rendering into.
///
/// Returns null if the Android view has not been successfully created, or if it has been
/// disposed.
int? get textureId;
/// The unique identifier of the Android view controlled by this controller.
@Deprecated(
'Call `controller.viewId` instead. '
'This feature was deprecated after v1.20.0-2.0.pre.'
)
int get id => viewId;
/// Sends an Android [MotionEvent](https://developer.android.com/reference/android/view/MotionEvent)
/// to the view.
///
/// The Android MotionEvent object is created with [MotionEvent.obtain](https://developer.android.com/reference/android/view/MotionEvent.html#obtain(long,%20long,%20int,%20float,%20float,%20float,%20float,%20int,%20float,%20float,%20int,%20int)).
/// See documentation of [MotionEvent.obtain](https://developer.android.com/reference/android/view/MotionEvent.html#obtain(long,%20long,%20int,%20float,%20float,%20float,%20float,%20int,%20float,%20float,%20int,%20int))
/// for description of the parameters.
///
/// See [AndroidViewController.dispatchPointerEvent] for sending a
/// [PointerEvent].
Future<void> sendMotionEvent(AndroidMotionEvent event) async {
await SystemChannels.platform_views.invokeMethod<dynamic>(
'touch',
event._asList(viewId),
);
}
/// Converts a given point from the global coordinate system in logical pixels to the local coordinate system for this box.
///
/// This is required to convert a [PointerEvent] to an [AndroidMotionEvent].
/// It is typically provided by using [RenderBox.globalToLocal].
set pointTransformer(PointTransformer transformer) {
assert(transformer != null);
_motionEventConverter._pointTransformer = transformer;
}
/// Whether the platform view has already been created.
bool get isCreated => _state == _AndroidViewState.created;
/// Adds a callback that will get invoke after the platform view has been
/// created.
void addOnPlatformViewCreatedListener(PlatformViewCreatedCallback listener) {
assert(listener != null);
assert(_state != _AndroidViewState.disposed);
_platformViewCreatedCallbacks.add(listener);
}
/// Removes a callback added with [addOnPlatformViewCreatedListener].
void removeOnPlatformViewCreatedListener(
PlatformViewCreatedCallback listener) {
assert(_state != _AndroidViewState.disposed);
_platformViewCreatedCallbacks.remove(listener);
}
/// Sets the layout direction for the Android view.
Future<void> setLayoutDirection(TextDirection layoutDirection) async {
assert(_state != _AndroidViewState.disposed,
'trying to set a layout direction for a disposed UIView. View id: $viewId');
if (layoutDirection == _layoutDirection)
return;
assert(layoutDirection != null);
_layoutDirection = layoutDirection;
// If the view was not yet created we just update _layoutDirection and return, as the new
// direction will be used in _create.
if (_state == _AndroidViewState.waitingForSize)
return;
await SystemChannels.platform_views
.invokeMethod<void>('setDirection', <String, dynamic>{
'id': viewId,
'direction': _getAndroidDirection(layoutDirection),
});
}
/// Converts the [PointerEvent] and sends an Android [MotionEvent](https://developer.android.com/reference/android/view/MotionEvent)
/// to the view.
///
/// This method can only be used if a [PointTransformer] is provided to
/// [AndroidViewController.pointTransformer]. Otherwise, an [AssertionError]
/// is thrown. See [AndroidViewController.sendMotionEvent] for sending a
/// `MotionEvent` without a [PointTransformer].
///
/// The Android MotionEvent object is created with [MotionEvent.obtain](https://developer.android.com/reference/android/view/MotionEvent.html#obtain(long,%20long,%20int,%20float,%20float,%20float,%20float,%20int,%20float,%20float,%20int,%20int)).
/// See documentation of [MotionEvent.obtain](https://developer.android.com/reference/android/view/MotionEvent.html#obtain(long,%20long,%20int,%20float,%20float,%20float,%20float,%20int,%20float,%20float,%20int,%20int))
/// for description of the parameters.
@override
Future<void> dispatchPointerEvent(PointerEvent event) async {
if (event is PointerHoverEvent) {
return;
}
if (event is PointerDownEvent) {
_motionEventConverter.handlePointerDownEvent(event);
}
_motionEventConverter.updatePointerPositions(event);
final AndroidMotionEvent? androidEvent =
_motionEventConverter.toAndroidMotionEvent(event);
if (event is PointerUpEvent) {
_motionEventConverter.handlePointerUpEvent(event);
} else if (event is PointerCancelEvent) {
_motionEventConverter.handlePointerCancelEvent(event);
}
if (androidEvent != null) {
await sendMotionEvent(androidEvent);
}
}
/// Clears the focus from the Android View if it is focused.
@override
Future<void> clearFocus() {
if (_state != _AndroidViewState.created) {
return Future<void>.value();
}
return SystemChannels.platform_views.invokeMethod<void>('clearFocus', viewId);
}
/// Disposes the Android view.
///
/// The [AndroidViewController] object is unusable after calling this.
/// The identifier of the platform view cannot be reused after the view is
/// disposed.
@override
Future<void> dispose() async {
if (_state == _AndroidViewState.creating || _state == _AndroidViewState.created)
await _sendDisposeMessage();
_platformViewCreatedCallbacks.clear();
_state = _AndroidViewState.disposed;
PlatformViewsService._instance._focusCallbacks.remove(viewId);
}
}
/// Controls an Android view by rendering to an [AndroidViewSurface].
///
/// Typically created with [PlatformViewsService.initAndroidView].
class SurfaceAndroidViewController extends AndroidViewController {
SurfaceAndroidViewController._({
required int viewId,
required String viewType,
required TextDirection layoutDirection,
dynamic creationParams,
MessageCodec<dynamic>? creationParamsCodec,
}) : super._(
viewId: viewId,
viewType: viewType,
layoutDirection: layoutDirection,
creationParams: creationParams,
creationParamsCodec: creationParamsCodec);
@override
Future<void> _sendCreateMessage() {
final Map<String, dynamic> args = <String, dynamic>{
'id': viewId,
'viewType': _viewType,
'direction': AndroidViewController._getAndroidDirection(_layoutDirection),
'hybrid': true,
};
if (_creationParams != null) {
final ByteData paramsByteData =
_creationParamsCodec!.encodeMessage(_creationParams)!;
args['params'] = Uint8List.view(
paramsByteData.buffer,
0,
paramsByteData.lengthInBytes,
);
}
return SystemChannels.platform_views.invokeMethod<void>('create', args);
}
@override
int get textureId {
throw UnimplementedError('Not supported for $SurfaceAndroidViewController.');
}
@override
Future<void> _sendDisposeMessage() {
return SystemChannels.platform_views
.invokeMethod<void>('dispose', <String, dynamic>{
'id': viewId,
'hybrid': true,
});
}
@override
Future<void> setSize(Size size) {
throw UnimplementedError('Not supported for $SurfaceAndroidViewController.');
}
}
/// Controls an Android view that is rendered to a texture.
///
/// This is typically used by [AndroidView] to display an Android View in a
/// [VirtualDisplay](https://developer.android.com/reference/android/hardware/display/VirtualDisplay).
///
/// Typically created with [PlatformViewsService.initAndroidView].
class TextureAndroidViewController extends AndroidViewController {
TextureAndroidViewController._({
required int viewId,
required String viewType,
required TextDirection layoutDirection,
dynamic creationParams,
MessageCodec<dynamic>? creationParamsCodec,
}) : super._(
viewId: viewId,
viewType: viewType,
layoutDirection: layoutDirection,
creationParams: creationParams,
creationParamsCodec: creationParamsCodec,
waitingForSize: true,
);
/// The texture entry id into which the Android view is rendered.
int? _textureId;
/// Returns the texture entry id that the Android view is rendering into.
///
/// Returns null if the Android view has not been successfully created, or if it has been
/// disposed.
@override
int? get textureId => _textureId;
late Size _size;
@override
Future<void> setSize(Size size) async {
assert(_state != _AndroidViewState.disposed,
'trying to size a disposed Android View. View id: $viewId');
assert(size != null);
assert(!size.isEmpty);
if (_state == _AndroidViewState.waitingForSize) {
_size = size;
return create();