update flutter runtime

updated the flutter runtime
@alxgibsn @philter This update included some changes from other branches.
Can you verify that all looks good?

Diffs=
cd9520371 update flutter runtime (#7141)
2b2e92ca7 Fix audio instances (#7113)

Co-authored-by: hernan <hernan@rive.app>

.rive_head

@@ -1 +1 @@
-fdd52090da92bc230f9bf6d4707a77b1e80e62d2
+cd9520371615e6eb1fcc5f4ba9b5c3d58b3f29ea

lib/src/generated/animation/layer_state_base.dart

@@ -2,6 +2,7 @@
 // lib/src/generated/animation/layer_state_base.dart.
 // Do not modify manually.
 
+import 'package:rive/src/core/core.dart';
 import 'package:rive/src/rive_core/animation/state_machine_layer_component.dart';
 
 abstract class LayerStateBase extends StateMachineLayerComponent {
@@ -11,4 +12,34 @@ abstract class LayerStateBase extends StateMachineLayerComponent {
   @override
   Set<int> get coreTypes =>
       {LayerStateBase.typeKey, StateMachineLayerComponentBase.typeKey};
+
+  /// --------------------------------------------------------------------------
+  /// Flags field with key 536.
+  static const int flagsPropertyKey = 536;
+  static const int flagsInitialValue = 0;
+  int _flags = flagsInitialValue;
+  int get flags => _flags;
+
+  /// Change the [_flags] field value.
+  /// [flagsChanged] will be invoked only if the field's value has changed.
+  set flags(int value) {
+    if (_flags == value) {
+      return;
+    }
+    int from = _flags;
+    _flags = value;
+    if (hasValidated) {
+      flagsChanged(from, value);
+    }
+  }
+
+  void flagsChanged(int from, int to);
+
+  @override
+  void copy(Core source) {
+    super.copy(source);
+    if (source is LayerStateBase) {
+      _flags = source._flags;
+    }
+  }
 }

lib/src/generated/animation/state_transition_base.dart

@@ -161,6 +161,31 @@ abstract class StateTransitionBase extends StateMachineLayerComponent {
 
   void interpolatorIdChanged(int from, int to);
 
+  /// --------------------------------------------------------------------------
+  /// RandomWeight field with key 537.
+  static const int randomWeightPropertyKey = 537;
+  static const int randomWeightInitialValue = 1;
+  int _randomWeight = randomWeightInitialValue;
+
+  /// Weight of the transition in the overall random options
+  int get randomWeight => _randomWeight;
+
+  /// Change the [_randomWeight] field value.
+  /// [randomWeightChanged] will be invoked only if the field's value has
+  /// changed.
+  set randomWeight(int value) {
+    if (_randomWeight == value) {
+      return;
+    }
+    int from = _randomWeight;
+    _randomWeight = value;
+    if (hasValidated) {
+      randomWeightChanged(from, value);
+    }
+  }
+
+  void randomWeightChanged(int from, int to);
+
   @override
   void copy(Core source) {
     super.copy(source);
@@ -171,6 +196,7 @@ abstract class StateTransitionBase extends StateMachineLayerComponent {
       _exitTime = source._exitTime;
       _interpolationType = source._interpolationType;
       _interpolatorId = source._interpolatorId;
+      _randomWeight = source._randomWeight;
     }
   }
 }

lib/src/generated/layout_component_absolute_base.dart

@@ -0,0 +1,22 @@
+// Core automatically generated
+// lib/src/generated/layout_component_absolute_base.dart.
+// Do not modify manually.
+
+import 'package:rive/src/generated/component_base.dart';
+import 'package:rive/src/generated/container_component_base.dart';
+import 'package:rive/src/generated/world_transform_component_base.dart';
+import 'package:rive/src/rive_core/layout_component.dart';
+
+abstract class AbsoluteLayoutComponentBase extends LayoutComponent {
+  static const int typeKey = 423;
+  @override
+  int get coreType => AbsoluteLayoutComponentBase.typeKey;
+  @override
+  Set<int> get coreTypes => {
+        AbsoluteLayoutComponentBase.typeKey,
+        LayoutComponentBase.typeKey,
+        WorldTransformComponentBase.typeKey,
+        ContainerComponentBase.typeKey,
+        ComponentBase.typeKey
+      };
+}

lib/src/generated/rive_core_context.dart

@@ -13,6 +13,7 @@ import 'package:rive/src/generated/animation/cubic_interpolator_base.dart';
 import 'package:rive/src/generated/animation/interpolating_keyframe_base.dart';
 import 'package:rive/src/generated/animation/keyframe_base.dart';
 import 'package:rive/src/generated/animation/keyframe_string_base.dart';
+import 'package:rive/src/generated/animation/layer_state_base.dart';
 import 'package:rive/src/generated/animation/listener_input_change_base.dart';
 import 'package:rive/src/generated/animation/nested_input_base.dart';
 import 'package:rive/src/generated/animation/nested_linear_animation_base.dart';
@@ -30,6 +31,7 @@ import 'package:rive/src/generated/constraints/transform_component_constraint_ba
 import 'package:rive/src/generated/constraints/transform_component_constraint_y_base.dart';
 import 'package:rive/src/generated/constraints/transform_space_constraint_base.dart';
 import 'package:rive/src/generated/drawable_base.dart';
+import 'package:rive/src/generated/layout_component_absolute_base.dart';
 import 'package:rive/src/generated/nested_animation_base.dart';
 import 'package:rive/src/generated/shapes/paint/shape_paint_base.dart';
 import 'package:rive/src/generated/shapes/parametric_path_base.dart';
@@ -112,6 +114,7 @@ import 'package:rive/src/rive_core/event.dart';
 import 'package:rive/src/rive_core/joystick.dart';
 import 'package:rive/src/rive_core/layout/layout_component_style.dart';
 import 'package:rive/src/rive_core/layout_component.dart';
+import 'package:rive/src/rive_core/layout_component_absolute.dart';
 import 'package:rive/src/rive_core/nested_artboard.dart';
 import 'package:rive/src/rive_core/node.dart';
 import 'package:rive/src/rive_core/open_url_event.dart';
@@ -332,6 +335,8 @@ class RiveCoreContext {
         return Joystick();
       case BackboardBase.typeKey:
         return Backboard();
+      case AbsoluteLayoutComponentBase.typeKey:
+        return AbsoluteLayoutComponent();
       case OpenUrlEventBase.typeKey:
         return OpenUrlEvent();
       case BoneBase.typeKey:
@@ -749,6 +754,11 @@ class RiveCoreContext {
           object.eventId = value;
         }
         break;
+      case LayerStateBase.flagsPropertyKey:
+        if (object is LayerStateBase && value is int) {
+          object.flags = value;
+        }
+        break;
       case AnimationBase.namePropertyKey:
         if (object is AnimationBase && value is String) {
           object.name = value;
@@ -1019,6 +1029,11 @@ class RiveCoreContext {
           object.interpolatorId = value;
         }
         break;
+      case StateTransitionBase.randomWeightPropertyKey:
+        if (object is StateTransitionBase && value is int) {
+          object.randomWeight = value;
+        }
+        break;
       case NestedBoolBase.nestedValuePropertyKey:
         if (object is NestedBoolBase && value is bool) {
           object.nestedValue = value;
@@ -1884,6 +1899,7 @@ class RiveCoreContext {
       case LayoutComponentStyleBase.layoutFlags1PropertyKey:
       case LayoutComponentStyleBase.layoutFlags2PropertyKey:
       case ListenerFireEventBase.eventIdPropertyKey:
+      case LayerStateBase.flagsPropertyKey:
       case LinearAnimationBase.fpsPropertyKey:
       case LinearAnimationBase.durationPropertyKey:
       case LinearAnimationBase.loopValuePropertyKey:
@@ -1915,6 +1931,7 @@ class RiveCoreContext {
       case StateTransitionBase.exitTimePropertyKey:
       case StateTransitionBase.interpolationTypePropertyKey:
       case StateTransitionBase.interpolatorIdPropertyKey:
+      case StateTransitionBase.randomWeightPropertyKey:
       case StateMachineFireEventBase.eventIdPropertyKey:
       case StateMachineFireEventBase.occursValuePropertyKey:
       case ElasticInterpolatorBase.easingValuePropertyKey:
@@ -2235,6 +2252,8 @@ class RiveCoreContext {
         return (object as LayoutComponentStyleBase).layoutFlags2;
       case ListenerFireEventBase.eventIdPropertyKey:
         return (object as ListenerFireEventBase).eventId;
+      case LayerStateBase.flagsPropertyKey:
+        return (object as LayerStateBase).flags;
       case LinearAnimationBase.fpsPropertyKey:
         return (object as LinearAnimationBase).fps;
       case LinearAnimationBase.durationPropertyKey:
@@ -2297,6 +2316,8 @@ class RiveCoreContext {
         return (object as StateTransitionBase).interpolationType;
       case StateTransitionBase.interpolatorIdPropertyKey:
         return (object as StateTransitionBase).interpolatorId;
+      case StateTransitionBase.randomWeightPropertyKey:
+        return (object as StateTransitionBase).randomWeight;
       case StateMachineFireEventBase.eventIdPropertyKey:
         return (object as StateMachineFireEventBase).eventId;
       case StateMachineFireEventBase.occursValuePropertyKey:
@@ -2937,6 +2958,11 @@ class RiveCoreContext {
           object.eventId = value;
         }
         break;
+      case LayerStateBase.flagsPropertyKey:
+        if (object is LayerStateBase) {
+          object.flags = value;
+        }
+        break;
       case LinearAnimationBase.fpsPropertyKey:
         if (object is LinearAnimationBase) {
           object.fps = value;
@@ -3092,6 +3118,11 @@ class RiveCoreContext {
           object.interpolatorId = value;
         }
         break;
+      case StateTransitionBase.randomWeightPropertyKey:
+        if (object is StateTransitionBase) {
+          object.randomWeight = value;
+        }
+        break;
       case StateMachineFireEventBase.eventIdPropertyKey:
         if (object is StateMachineFireEventBase) {
           object.eventId = value;

lib/src/rive_core/animation/layer_state.dart

@@ -26,6 +26,9 @@ abstract class LayerState extends LayerStateBase {
     _transitions.remove(transition);
   }
 
+  @override
+  void flagsChanged(int from, int to) {}
+
   StateInstance makeInstance();
 
   @override

lib/src/rive_core/animation/state_transition.dart

@@ -28,6 +28,7 @@ class StateTransition extends StateTransitionBase {
 
   static final StateTransition unknown = StateTransition();
 
+  int evaluatedRandomWeight = 0;
   Interpolator? _interpolator;
   Interpolator? get interpolator => _interpolator;
   set interpolator(Interpolator? value) {
@@ -160,6 +161,9 @@ class StateTransition extends StateTransitionBase {
   @override
   void durationChanged(int from, int to) {}
 
+  @override
+  void randomWeightChanged(int from, int to) {}
+
   @override
   void exitTimeChanged(int from, int to) {}
 

lib/src/rive_core/artboard.dart

@@ -535,23 +535,12 @@ class Artboard extends ArtboardBase with ShapePaintContainer {
   @override
   void onStrokesChanged() {}
 
-  /// Sets `isPlaying` to true. Animations and state machines will play.
-  ///
-  /// See [pause], to pause the artboard from advancing/drawing.
   @mustBeOverridden
   void play() {}
 
-  /// Sets `isPlaying` to false. Animations and state machines will not play.
-  /// This can be used to reduce resources when the animation is not visible
-  /// in the app.
-  ///
-  /// See [play], to play the artboard and continue advancing/drawing.
   @mustBeOverridden
   void pause() {}
 
-  /// Indicates if the runtime artboard is active/playing. When `false` no
-  /// artboard animation or state machine will advance. The underlying animation
-  /// ticker is paused.
   @mustBeOverridden
   bool get isPlaying => true;
 

lib/src/rive_core/assets/audio_asset.dart

@@ -29,11 +29,6 @@ class AudioAsset extends AudioAssetBase {
     audioBytes = bytes;
   }
 
-  @override
-  String get fileExtension {
-    return 'wav';
-  }
-
   static AudioContainerFormat containerFormatFromName(String name) {
     switch (name) {
       case 'flac':
@@ -45,4 +40,8 @@ class AudioAsset extends AudioAssetBase {
     }
     return AudioContainerFormat.unknown;
   }
+
+  // See comment in font_asset.dart
+  @override
+  String get fileExtension => 'wav';
 }

lib/src/rive_core/audio_player.dart

@@ -72,7 +72,6 @@ class AudioPlayer {
     _soundDuration = source.duration;
     _soundStartTime = engineTime -
         (startTime.inMicroseconds * 1e-6 * engine.sampleRate).round();
-
     _timer ??= Timer.periodic(const Duration(milliseconds: 0), _frameCallback);
   }
 

lib/src/rive_core/layer_state_flags.dart

@@ -0,0 +1,4 @@
+class LayerStateFlags {
+  /// Whether the state can randomize on exit.
+  static const int random = 1 << 0;
+}

lib/src/rive_core/layout/layout_component_style.dart

@@ -238,7 +238,9 @@ class LayoutComponentStyle extends LayoutComponentStyleBase {
   void layoutFlags0Changed(int from, int to) => markLayoutNodeDirty();
 
   @override
-  void layoutFlags1Changed(int from, int to) => markLayoutNodeDirty();
+  void layoutFlags1Changed(int from, int to) {
+    markLayoutNodeDirty();
+  }
 
   @override
   void layoutFlags2Changed(int from, int to) => markLayoutNodeDirty();

lib/src/rive_core/layout_component.dart

@@ -30,6 +30,17 @@ class LayoutComponent extends LayoutComponentBase {
   final LayoutNode _layoutNode = LayoutNode.make();
   LayoutNode get layoutNode => _layoutNode;
 
+  LayoutComponent? get layoutParent {
+    var p = parent;
+    while (p != null) {
+      if (p is LayoutComponent) {
+        return p;
+      }
+      p = p.parent;
+    }
+    return artboard;
+  }
+
   void markLayoutNodeDirty() {
     _layoutNode.markDirty();
     artboard?.markLayoutDirty(this);
@@ -253,6 +264,24 @@ class LayoutComponent extends LayoutComponentBase {
     );
   }
 
+  AABB get layoutBounds {
+    return AABB.fromValues(
+      _layoutLocation.dx,
+      _layoutLocation.dy,
+      _layoutLocation.dx + _layoutSize.width,
+      _layoutLocation.dy + _layoutSize.height,
+    );
+  }
+
+  AABB get worldBounds {
+    return AABB.fromValues(
+      worldTransform[4],
+      worldTransform[5],
+      worldTransform[4] + _layoutSize.width,
+      worldTransform[5] + _layoutSize.height,
+    );
+  }
+
   @override
   AABB get constraintBounds => localBounds;
 

lib/src/rive_core/layout_component_absolute.dart

@@ -0,0 +1,7 @@
+import 'package:rive/src/generated/layout_component_absolute_base.dart';
+
+export 'package:rive/src/generated/layout_component_base.dart';
+
+class AbsoluteLayoutComponent extends AbsoluteLayoutComponentBase {
+  
+}

lib/src/rive_core/state_machine_controller.dart

@@ -1,6 +1,7 @@
 library rive_core;
 
 import 'dart:collection';
+import 'dart:math';
 
 import 'package:collection/collection.dart';
 import 'package:flutter/gestures.dart';
@@ -28,6 +29,7 @@ import 'package:rive/src/rive_core/audio_player.dart';
 import 'package:rive/src/rive_core/component.dart';
 import 'package:rive/src/rive_core/drawable.dart';
 import 'package:rive/src/rive_core/event.dart';
+import 'package:rive/src/rive_core/layer_state_flags.dart';
 import 'package:rive/src/rive_core/nested_artboard.dart';
 import 'package:rive/src/rive_core/node.dart';
 import 'package:rive/src/rive_core/rive_animation_controller.dart';
@@ -86,12 +88,14 @@ class LayerController {
     }
   }
 
-  bool _changeState(LayerState? state, {StateTransition? transition}) {
+  bool _canChangeState(LayerState? state) {
+    return state != _currentState?.state;
+  }
+
+  void _changeState(LayerState? state, {StateTransition? transition}) {
     assert(state is! AnyState,
         'We don\'t allow making the AnyState an active state.');
-    if (state == _currentState?.state) {
-      return false;
-    }
+    assert(state != _currentState?.state, 'Cannot change to state to self.');
     var currentState = _currentState;
     if (currentState != null) {
       _fireEvents(currentState.state.eventsAt(StateMachineFireOccurance.atEnd));
@@ -105,8 +109,6 @@ class LayerController {
     } else {
       _currentState = null;
     }
-
-    return true;
   }
 
   void dispose() {
@@ -208,64 +210,118 @@ class LayerController {
     return tryChangeState(_currentState, ignoreTriggers);
   }
 
+  StateTransition? _findRandomTransition(
+      StateInstance stateFrom, bool ignoreTriggers) {
+    double totalWeight = 0;
+    final transitions = stateFrom.state.transitions;
+    for (final transition in transitions) {
+      var allowed = transition.allowed(
+          stateFrom, controller._inputValues, ignoreTriggers);
+      if (allowed == AllowTransition.yes &&
+          _canChangeState(transition.stateTo)) {
+        transition.evaluatedRandomWeight = transition.randomWeight;
+        totalWeight += transition.randomWeight;
+        // If random is not active we don't search for more candidates
+      } else {
+        transition.evaluatedRandomWeight = 0;
+        if (allowed == AllowTransition.waitingForExit) {
+          _waitingForExit = true;
+        }
+      }
+    }
+    if (totalWeight > 0) {
+      final random = Random().nextDouble() * totalWeight;
+      double currentWeight = 0;
+      int index = 0;
+      while (index < transitions.length) {
+        final transitionWeight =
+            transitions.elementAt(index).evaluatedRandomWeight;
+        if (currentWeight + transitionWeight > random) {
+          break;
+        }
+        currentWeight += transitionWeight;
+        index += 1;
+      }
+      assert(index < transitions.length);
+      final transition = transitions.elementAt(index);
+      return transition;
+    }
+    return null;
+  }
+
+  StateTransition? _findAllowedTransition(
+      StateInstance stateFrom, bool ignoreTriggers) {
+    if (stateFrom.state.flags & LayerStateFlags.random ==
+        LayerStateFlags.random) {
+      return _findRandomTransition(stateFrom, ignoreTriggers);
+    }
+    final transitions = stateFrom.state.transitions;
+    for (final transition in transitions) {
+      var allowed = transition.allowed(
+          stateFrom, controller._inputValues, ignoreTriggers);
+      if (allowed == AllowTransition.yes &&
+          _canChangeState(transition.stateTo)) {
+        return transition;
+      } else if (allowed == AllowTransition.waitingForExit) {
+        _waitingForExit = true;
+      }
+    }
+    return null;
+  }
+
   bool tryChangeState(StateInstance? stateFrom, bool ignoreTriggers) {
     if (stateFrom == null) {
       return false;
     }
 
     var outState = _currentState;
-    for (final transition in stateFrom.state.transitions) {
-      var allowed = transition.allowed(
-          stateFrom, controller._inputValues, ignoreTriggers);
-      if (allowed == AllowTransition.yes &&
-          _changeState(transition.stateTo, transition: transition)) {
-        // Take transition
-        _transition = transition;
+    final transition = _findAllowedTransition(stateFrom, ignoreTriggers);
+    if (transition != null) {
+      _changeState(transition.stateTo, transition: transition);
+      // Take transition
+      _transition = transition;
 
-        _fireEvents(transition.eventsAt(StateMachineFireOccurance.atStart));
-        // Immediately fire end events if transition has no duration.
-        if (transition.duration == 0) {
-          _transitionCompleted = true;
-          _fireEvents(transition.eventsAt(StateMachineFireOccurance.atEnd));
-        } else {
-          _transitionCompleted = false;
-        }
-
-        _stateFrom = outState;
-
-        // If we had an exit time and wanted to pause on exit, make sure to hold
-        // the exit time. Delegate this to the transition by telling it that it
-        // was completed.
-        if (outState != null && transition.applyExitCondition(outState)) {
-          // Make sure we apply this state.
-          var inst = (outState as AnimationStateInstance).animationInstance;
-          _holdAnimation = inst.animation;
-          _holdTime = inst.time;
-        }
-        _mixFrom = _mix;
-
-        // Keep mixing last animation that was mixed in.
-        if (_mix != 0) {
-          _holdAnimationFrom = transition.pauseOnExit;
-        }
-        if (outState is AnimationStateInstance) {
-          var spilledTime = outState.animationInstance.spilledTime;
-          _currentState?.advance(spilledTime, controller);
-        }
-
-        _mix = 0;
-        _updateMix(0);
-        // Make sure to reset _waitingForExit to false if we succeed at taking a
-        // transition.
-        _waitingForExit = false;
-        // State has changed, fire the callback if there's one
-        if (_currentState != null) {
-          onLayerStateChange?.call(_currentState!.state);
-        }
-        return true;
-      } else if (allowed == AllowTransition.waitingForExit) {
-        _waitingForExit = true;
+      _fireEvents(transition.eventsAt(StateMachineFireOccurance.atStart));
+      // Immediately fire end events if transition has no duration.
+      if (transition.duration == 0) {
+        _transitionCompleted = true;
+        _fireEvents(transition.eventsAt(StateMachineFireOccurance.atEnd));
+      } else {
+        _transitionCompleted = false;
       }
+
+      _stateFrom = outState;
+
+      // If we had an exit time and wanted to pause on exit, make sure to hold
+      // the exit time. Delegate this to the transition by telling it that it
+      // was completed.
+      if (outState != null && transition.applyExitCondition(outState)) {
+        // Make sure we apply this state.
+        var inst = (outState as AnimationStateInstance).animationInstance;
+        _holdAnimation = inst.animation;
+        _holdTime = inst.time;
+      }
+      _mixFrom = _mix;
+
+      // Keep mixing last animation that was mixed in.
+      if (_mix != 0) {
+        _holdAnimationFrom = transition.pauseOnExit;
+      }
+      if (outState is AnimationStateInstance) {
+        var spilledTime = outState.animationInstance.spilledTime;
+        _currentState?.advance(spilledTime, controller);
+      }
+
+      _mix = 0;
+      _updateMix(0);
+      // Make sure to reset _waitingForExit to false if we succeed at taking a
+      // transition.
+      _waitingForExit = false;
+      // State has changed, fire the callback if there's one
+      if (_currentState != null) {
+        onLayerStateChange?.call(_currentState!.state);
+      }
+      return true;
     }
     return false;
   }
@@ -289,7 +345,9 @@ class StateMachineController extends RiveAnimationController<CoreContext>
 
   final _eventListeners = <OnEvent>{};
   AudioPlayer? _audioPlayer;
+
   AudioPlayer get audioPlayer => (_audioPlayer ??= AudioPlayer.make())!;
+
   AudioPlayer? get peekAudioPlayer => _audioPlayer;
 
   List<Event> get reportedEvents => _reportedEvents;