Add pre-threshold fling vibration for Back gesture

Bug: 290869686
Test: Manual
(cherry picked from commit 2354d4d1db4a92e0ed17fdccaee4d96826207770)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:151f3a646abbffd271b0787ed8fb9413849ea1e7)
Merged-In: Iad0991724c75c0a63d8a14c313a143a9be660137
Change-Id: Iad0991724c75c0a63d8a14c313a143a9be660137

1 files changed, 34 insertions, 22 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanelController.kt b/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanelController.kt
index c4749e093854..c77f3f49a77c 100644
--- a/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanelController.kt
+++ b/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanelController.kt
@@ -231,7 +231,6 @@ internal constructor(
             animation.removeEndListener(this)
 
             if (!canceled) {
-
                 // The delay between finishing this animation and starting the runnable
                 val delay = max(0, runnableDelay - elapsedTimeSinceEntry)
 
@@ -461,7 +460,6 @@ internal constructor(
     }
 
     private fun handleMoveEvent(event: MotionEvent) {
-
         val x = event.x
         val y = event.y
 
@@ -927,17 +925,7 @@ internal constructor(
             GestureState.ACTIVE -> {
                 previousXTranslationOnActiveOffset = previousXTranslation
                 updateRestingArrowDimens()
-                if (featureFlags.isEnabled(ONE_WAY_HAPTICS_API_MIGRATION)) {
-                    vibratorHelper.performHapticFeedback(
-                        mView,
-                        HapticFeedbackConstants.GESTURE_THRESHOLD_ACTIVATE
-                    )
-                } else {
-                    vibratorHelper.cancel()
-                    mainHandler.postDelayed(10L) {
-                        vibratorHelper.vibrate(VIBRATE_ACTIVATED_EFFECT)
-                    }
-                }
+                performActivatedHapticFeedback()
                 val popVelocity =
                     if (previousState == GestureState.INACTIVE) {
                         POP_ON_INACTIVE_TO_ACTIVE_VELOCITY
@@ -958,25 +946,24 @@ internal constructor(
 
                 mView.popOffEdge(POP_ON_INACTIVE_VELOCITY)
 
-                if (featureFlags.isEnabled(ONE_WAY_HAPTICS_API_MIGRATION)) {
-                    vibratorHelper.performHapticFeedback(
-                        mView,
-                        HapticFeedbackConstants.GESTURE_THRESHOLD_DEACTIVATE
-                    )
-                } else {
-                    vibratorHelper.vibrate(VIBRATE_DEACTIVATED_EFFECT)
-                }
+                performDeactivatedHapticFeedback()
                 updateRestingArrowDimens()
             }
             GestureState.FLUNG -> {
+                // Typically a vibration is only played while transitioning to ACTIVE. However there
+                // are instances where a fling to trigger back occurs while not in that state.
+                // (e.g. A fling is detected before crossing the trigger threshold.)
+                if (previousState != GestureState.ACTIVE) {
+                    performActivatedHapticFeedback()
+                }
                 mainHandler.postDelayed(POP_ON_FLING_DELAY) {
                     mView.popScale(POP_ON_FLING_VELOCITY)
                 }
-                updateRestingArrowDimens()
                 mainHandler.postDelayed(
                     onEndSetCommittedStateListener.runnable,
                     MIN_DURATION_FLING_ANIMATION
                 )
+                updateRestingArrowDimens()
             }
             GestureState.COMMITTED -> {
                 // In most cases, animating between states is handled via `updateRestingArrowDimens`
@@ -1011,6 +998,31 @@ internal constructor(
         }
     }
 
+    private fun performDeactivatedHapticFeedback() {
+        if (featureFlags.isEnabled(ONE_WAY_HAPTICS_API_MIGRATION)) {
+            vibratorHelper.performHapticFeedback(
+                    mView,
+                    HapticFeedbackConstants.GESTURE_THRESHOLD_DEACTIVATE
+            )
+        } else {
+            vibratorHelper.vibrate(VIBRATE_DEACTIVATED_EFFECT)
+        }
+    }
+
+    private fun performActivatedHapticFeedback() {
+        if (featureFlags.isEnabled(ONE_WAY_HAPTICS_API_MIGRATION)) {
+            vibratorHelper.performHapticFeedback(
+                    mView,
+                    HapticFeedbackConstants.GESTURE_THRESHOLD_ACTIVATE
+            )
+        } else {
+            vibratorHelper.cancel()
+            mainHandler.postDelayed(10L) {
+                vibratorHelper.vibrate(VIBRATE_ACTIVATED_EFFECT)
+            }
+        }
+    }
+
     private fun convertVelocityToAnimationFactor(
         valueOnFastVelocity: Float,
         valueOnSlowVelocity: Float,