diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/UdfpsAnimationViewController.kt b/packages/SystemUI/src/com/android/systemui/biometrics/UdfpsAnimationViewController.kt
index ac81633cdb2b0..5cfbdb0caf2d2 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/UdfpsAnimationViewController.kt
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/UdfpsAnimationViewController.kt
@@ -54,14 +54,13 @@ abstract class UdfpsAnimationViewController<T : UdfpsAnimationView>(
     private var dialogAlphaAnimator: ValueAnimator? = null
     private val dialogListener = SystemUIDialogManager.Listener { runDialogAlphaAnimator() }
 
-    private val panelExpansionListener =
-        PanelExpansionListener { fraction, expanded, tracking ->
-            // Notification shade can be expanded but not visible (fraction: 0.0), for example
-            // when a heads-up notification (HUN) is showing.
-            notificationShadeVisible = expanded && fraction > 0f
-            view.onExpansionChanged(fraction)
-            updatePauseAuth()
-        }
+    private val panelExpansionListener = PanelExpansionListener { event ->
+        // Notification shade can be expanded but not visible (fraction: 0.0), for example
+        // when a heads-up notification (HUN) is showing.
+        notificationShadeVisible = event.expanded && event.fraction > 0f
+        view.onExpansionChanged(event.fraction)
+        updatePauseAuth()
+    }
 
     /** If the notification shade is visible. */
     var notificationShadeVisible: Boolean = false
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/UdfpsKeyguardViewController.java b/packages/SystemUI/src/com/android/systemui/biometrics/UdfpsKeyguardViewController.java
index e8cfd422cc8ad..416b8ee60fd93 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/UdfpsKeyguardViewController.java
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/UdfpsKeyguardViewController.java
@@ -38,6 +38,7 @@ import com.android.systemui.statusbar.phone.KeyguardBouncer;
 import com.android.systemui.statusbar.phone.StatusBarKeyguardViewManager;
 import com.android.systemui.statusbar.phone.SystemUIDialogManager;
 import com.android.systemui.statusbar.phone.UnlockedScreenOffAnimationController;
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent;
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionListener;
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionStateManager;
 import com.android.systemui.statusbar.policy.ConfigurationController;
@@ -491,8 +492,8 @@ public class UdfpsKeyguardViewController extends UdfpsAnimationViewController<Ud
 
     private final PanelExpansionListener mPanelExpansionListener = new PanelExpansionListener() {
         @Override
-        public void onPanelExpansionChanged(
-                float fraction, boolean expanded, boolean tracking) {
+        public void onPanelExpansionChanged(PanelExpansionChangeEvent event) {
+            float fraction = event.getFraction();
             mPanelExpansionFraction =
                     mKeyguardViewManager.isBouncerInTransit() ? BouncerPanelExpansionCalculator
                             .aboutToShowBouncerProgress(fraction) : fraction;
diff --git a/packages/SystemUI/src/com/android/systemui/dreams/touch/BouncerSwipeTouchHandler.java b/packages/SystemUI/src/com/android/systemui/dreams/touch/BouncerSwipeTouchHandler.java
index 54b9430eb4453..fbca7b1d86d33 100644
--- a/packages/SystemUI/src/com/android/systemui/dreams/touch/BouncerSwipeTouchHandler.java
+++ b/packages/SystemUI/src/com/android/systemui/dreams/touch/BouncerSwipeTouchHandler.java
@@ -40,6 +40,7 @@ import com.android.systemui.statusbar.NotificationShadeWindowController;
 import com.android.systemui.statusbar.phone.CentralSurfaces;
 import com.android.systemui.statusbar.phone.KeyguardBouncer;
 import com.android.systemui.statusbar.phone.StatusBarKeyguardViewManager;
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent;
 import com.android.wm.shell.animation.FlingAnimationUtils;
 
 import java.util.Optional;
@@ -141,19 +142,27 @@ public class BouncerSwipeTouchHandler implements DreamTouchHandler {
                     // bouncer. As that view's expansion shrinks, the bouncer appears. The bouncer
                     // is fully hidden at full expansion (1) and fully visible when fully collapsed
                     // (0).
+                    final float dragDownAmount = e2.getY() - e1.getY();
                     final float screenTravelPercentage = Math.abs(e1.getY() - e2.getY())
                             / mCentralSurfaces.get().getDisplayHeight();
                     setPanelExpansion(mBouncerInitiallyShowing
-                            ? screenTravelPercentage : 1 - screenTravelPercentage);
+                            ? screenTravelPercentage : 1 - screenTravelPercentage, dragDownAmount);
                     return true;
                 }
             };
 
-    private void setPanelExpansion(float expansion) {
+    private void setPanelExpansion(float expansion, float dragDownAmount) {
         mCurrentExpansion = expansion;
-        mStatusBarKeyguardViewManager.onPanelExpansionChanged(mCurrentExpansion, false, true);
+        PanelExpansionChangeEvent event =
+                new PanelExpansionChangeEvent(
+                        /* fraction= */ mCurrentExpansion,
+                        /* expanded= */ false,
+                        /* tracking= */ true,
+                        /* dragDownPxAmount= */ dragDownAmount);
+        mStatusBarKeyguardViewManager.onPanelExpansionChanged(event);
     }
 
+
     @VisibleForTesting
     public enum DreamEvent implements UiEventLogger.UiEventEnum {
         @UiEvent(doc = "The screensaver has been swiped up.")
@@ -283,12 +292,14 @@ public class BouncerSwipeTouchHandler implements DreamTouchHandler {
         }
     }
 
-    private ValueAnimator createExpansionAnimator(float targetExpansion) {
+    private ValueAnimator createExpansionAnimator(float targetExpansion, float expansionHeight) {
         final ValueAnimator animator =
                 mValueAnimatorCreator.create(mCurrentExpansion, targetExpansion);
         animator.addUpdateListener(
                 animation -> {
-                    setPanelExpansion((float) animation.getAnimatedValue());
+                    float expansionFraction = (float) animation.getAnimatedValue();
+                    float dragDownAmount = expansionFraction * expansionHeight;
+                    setPanelExpansion(expansionFraction, dragDownAmount);
                 });
         if (!mBouncerInitiallyShowing && targetExpansion == KeyguardBouncer.EXPANSION_VISIBLE) {
             animator.addListener(
@@ -321,8 +332,8 @@ public class BouncerSwipeTouchHandler implements DreamTouchHandler {
         final float viewHeight = mCentralSurfaces.get().getDisplayHeight();
         final float currentHeight = viewHeight * mCurrentExpansion;
         final float targetHeight = viewHeight * expansion;
-
-        final ValueAnimator animator = createExpansionAnimator(expansion);
+        final float expansionHeight = targetHeight - currentHeight;
+        final ValueAnimator animator = createExpansionAnimator(expansion, expansionHeight);
         if (expansion == KeyguardBouncer.EXPANSION_HIDDEN) {
             // Hides the bouncer, i.e., fully expands the space above the bouncer.
             mFlingAnimationUtilsClosing.apply(animator, currentHeight, targetHeight, velocity,
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/NotificationShadeDepthController.kt b/packages/SystemUI/src/com/android/systemui/statusbar/NotificationShadeDepthController.kt
index 6ef938285263b..f6c4a316b2112 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/NotificationShadeDepthController.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/NotificationShadeDepthController.kt
@@ -42,6 +42,7 @@ import com.android.systemui.statusbar.phone.BiometricUnlockController
 import com.android.systemui.statusbar.phone.BiometricUnlockController.MODE_WAKE_AND_UNLOCK
 import com.android.systemui.statusbar.phone.DozeParameters
 import com.android.systemui.statusbar.phone.ScrimController
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionListener
 import com.android.systemui.statusbar.policy.ConfigurationController
 import com.android.systemui.statusbar.policy.KeyguardStateController
@@ -340,7 +341,9 @@ class NotificationShadeDepthController @Inject constructor(
     /**
      * Update blurs when pulling down the shade
      */
-    override fun onPanelExpansionChanged(rawFraction: Float, expanded: Boolean, tracking: Boolean) {
+    override fun onPanelExpansionChanged(event: PanelExpansionChangeEvent) {
+        val rawFraction = event.fraction
+        val tracking = event.tracking
         val timestamp = SystemClock.elapsedRealtimeNanos()
         val expansion = MathUtils.saturate(
                 (rawFraction - panelPullDownMinFraction) / (1f - panelPullDownMinFraction))
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/NotificationWakeUpCoordinator.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/NotificationWakeUpCoordinator.kt
index 74aedb23bf5ff..a8d685229b32d 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/NotificationWakeUpCoordinator.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/NotificationWakeUpCoordinator.kt
@@ -28,6 +28,7 @@ import com.android.systemui.statusbar.notification.stack.StackStateAnimator
 import com.android.systemui.statusbar.phone.DozeParameters
 import com.android.systemui.statusbar.phone.KeyguardBypassController
 import com.android.systemui.statusbar.phone.ScreenOffAnimationController
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionListener
 import com.android.systemui.statusbar.policy.HeadsUpManager
 import com.android.systemui.statusbar.policy.OnHeadsUpChangedListener
@@ -292,8 +293,8 @@ class NotificationWakeUpCoordinator @Inject constructor(
         this.state = newState
     }
 
-    override fun onPanelExpansionChanged(fraction: Float, expanded: Boolean, tracking: Boolean) {
-        val collapsedEnough = fraction <= 0.9f
+    override fun onPanelExpansionChanged(event: PanelExpansionChangeEvent) {
+        val collapsedEnough = event.fraction <= 0.9f
         if (collapsedEnough != this.collapsedEnoughToHide) {
             val couldShowPulsingHuns = canShowPulsingHuns
             this.collapsedEnoughToHide = collapsedEnough
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java
index 5e81b5da24558..71b0a16362685 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java
@@ -225,6 +225,7 @@ import com.android.systemui.statusbar.notification.stack.NotificationStackScroll
 import com.android.systemui.statusbar.phone.dagger.CentralSurfacesComponent;
 import com.android.systemui.statusbar.phone.dagger.StatusBarPhoneModule;
 import com.android.systemui.statusbar.phone.ongoingcall.OngoingCallController;
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent;
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionStateManager;
 import com.android.systemui.statusbar.policy.BatteryController;
 import com.android.systemui.statusbar.policy.BrightnessMirrorController;
@@ -1417,7 +1418,9 @@ public class CentralSurfaces extends CoreStartable implements
         }
     }
 
-    private void onPanelExpansionChanged(float fraction, boolean expanded, boolean tracking) {
+    private void onPanelExpansionChanged(PanelExpansionChangeEvent event) {
+        float fraction = event.getFraction();
+        boolean tracking = event.getTracking();
         dispatchPanelExpansionForKeyguardDismiss(fraction, tracking);
 
         if (fraction == 0 || fraction == 1) {
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelViewController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelViewController.java
index 4ba8441fc9a67..9e707644782c8 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelViewController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelViewController.java
@@ -120,6 +120,7 @@ public abstract class PanelViewController {
     private float mInitialOffsetOnTouch;
     private boolean mCollapsedAndHeadsUpOnDown;
     private float mExpandedFraction = 0;
+    private float mExpansionDragDownAmountPx = 0;
     protected float mExpandedHeight = 0;
     private boolean mPanelClosedOnDown;
     private boolean mHasLayoutedSinceDown;
@@ -793,6 +794,7 @@ public abstract class PanelViewController {
                     mHeightAnimator.end();
                 }
             }
+            mExpansionDragDownAmountPx = h;
             mExpandedFraction = Math.min(1f,
                     maxPanelHeight == 0 ? 0 : mExpandedHeight / maxPanelHeight);
             mAmbientState.setExpansionFraction(mExpandedFraction);
@@ -1109,7 +1111,7 @@ public abstract class PanelViewController {
      */
     public void updatePanelExpansionAndVisibility() {
         mPanelExpansionStateManager.onPanelExpansionChanged(
-                mExpandedFraction, isExpanded(), mTracking);
+                mExpandedFraction, isExpanded(), mTracking, mExpansionDragDownAmountPx);
         updateVisibility();
     }
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java
index 35aee66452893..f9e17da9773f5 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java
@@ -306,7 +306,7 @@ public class ScrimController implements ViewTreeObserver.OnPreDrawListener, Dump
             }
         });
         panelExpansionStateManager.addExpansionListener(
-                (fraction, expanded, tracking) -> setRawPanelExpansionFraction(fraction)
+                event -> setRawPanelExpansionFraction(event.getFraction())
         );
 
         mColors = new GradientColors();
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java
index dd166dd3610e9..052a4f7c5f7cf 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java
@@ -65,6 +65,7 @@ import com.android.systemui.statusbar.StatusBarState;
 import com.android.systemui.statusbar.SysuiStatusBarStateController;
 import com.android.systemui.statusbar.notification.ViewGroupFadeHelper;
 import com.android.systemui.statusbar.phone.KeyguardBouncer.BouncerExpansionCallback;
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent;
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionListener;
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionStateManager;
 import com.android.systemui.statusbar.policy.ConfigurationController;
@@ -353,7 +354,9 @@ public class StatusBarKeyguardViewManager implements RemoteInputController.Callb
     }
 
     @Override
-    public void onPanelExpansionChanged(float fraction, boolean expanded, boolean tracking) {
+    public void onPanelExpansionChanged(PanelExpansionChangeEvent event) {
+        float fraction = event.getFraction();
+        boolean tracking = event.getTracking();
         // Avoid having the shade and the bouncer open at the same time over a dream.
         final boolean hideBouncerOverDream =
                 mDreamOverlayStateController.isOverlayActive()
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionChangeEvent.kt b/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionChangeEvent.kt
new file mode 100644
index 0000000000000..c0384b4445110
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionChangeEvent.kt
@@ -0,0 +1,14 @@
+package com.android.systemui.statusbar.phone.panelstate
+
+import android.annotation.FloatRange
+
+data class PanelExpansionChangeEvent(
+    /** 0 when collapsed, 1 when fully expanded. */
+    @FloatRange(from = 0.0, to = 1.0) val fraction: Float,
+    /** Whether the panel should be considered expanded */
+    val expanded: Boolean,
+    /** Whether the user is actively dragging the panel. */
+    val tracking: Boolean,
+    /** The amount of pixels that the user has dragged during the expansion. */
+    val dragDownPxAmount: Float
+)
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionListener.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionListener.kt
similarity index 57%
rename from packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionListener.java
rename to packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionListener.kt
index b9f806d201b7c..d0038243122b2 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionListener.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionListener.kt
@@ -13,19 +13,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
-package com.android.systemui.statusbar.phone.panelstate;
+package com.android.systemui.statusbar.phone.panelstate
 
 /** A listener interface to be notified of expansion events for the notification panel. */
-public interface PanelExpansionListener {
+fun interface PanelExpansionListener {
     /**
-     * Invoked whenever the notification panel expansion changes, at every animation frame.
-     * This is the main expansion that happens when the user is swiping up to dismiss the
-     * lock screen and swiping to pull down the notification shade.
-     *
-     * @param fraction 0 when collapsed, 1 when fully expanded.
-     * @param expanded true if the panel should be considered expanded.
-     * @param tracking {@code true} when the user is actively dragging the panel.
+     * Invoked whenever the notification panel expansion changes, at every animation frame. This is
+     * the main expansion that happens when the user is swiping up to dismiss the lock screen and
+     * swiping to pull down the notification shade.
      */
-    void onPanelExpansionChanged(float fraction, boolean expanded, boolean tracking);
+    fun onPanelExpansionChanged(event: PanelExpansionChangeEvent)
 }
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionStateManager.kt b/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionStateManager.kt
index 2c7c8e113fc50..911e750f666e9 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionStateManager.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionStateManager.kt
@@ -37,6 +37,7 @@ class PanelExpansionStateManager @Inject constructor() {
     @FloatRange(from = 0.0, to = 1.0) private var fraction: Float = 0f
     private var expanded: Boolean = false
     private var tracking: Boolean = false
+    private var dragDownPxAmount: Float = 0f
 
     /**
      * Adds a listener that will be notified when the panel expansion fraction has changed.
@@ -45,7 +46,8 @@ class PanelExpansionStateManager @Inject constructor() {
      */
     fun addExpansionListener(listener: PanelExpansionListener) {
         expansionListeners.add(listener)
-        listener.onPanelExpansionChanged(fraction, expanded, tracking)
+        listener.onPanelExpansionChanged(
+            PanelExpansionChangeEvent(fraction, expanded, tracking, dragDownPxAmount))
     }
 
     /** Removes an expansion listener. */
@@ -77,7 +79,8 @@ class PanelExpansionStateManager @Inject constructor() {
     fun onPanelExpansionChanged(
         @FloatRange(from = 0.0, to = 1.0) fraction: Float,
         expanded: Boolean,
-        tracking: Boolean
+        tracking: Boolean,
+        dragDownPxAmount: Float
     ) {
         require(!fraction.isNaN()) { "fraction cannot be NaN" }
         val oldState = state
@@ -85,6 +88,7 @@ class PanelExpansionStateManager @Inject constructor() {
         this.fraction = fraction
         this.expanded = expanded
         this.tracking = tracking
+        this.dragDownPxAmount = dragDownPxAmount
 
         var fullyClosed = true
         var fullyOpened = false
@@ -110,14 +114,17 @@ class PanelExpansionStateManager @Inject constructor() {
                     "f=$fraction " +
                     "expanded=$expanded " +
                     "tracking=$tracking" +
+                    "drawDownPxAmount=$dragDownPxAmount " +
                     "${if (fullyOpened) " fullyOpened" else ""} " +
                     if (fullyClosed) " fullyClosed" else ""
         )
 
-        expansionListeners.forEach { it.onPanelExpansionChanged(fraction, expanded, tracking) }
+        val expansionChangeEvent =
+            PanelExpansionChangeEvent(fraction, expanded, tracking, dragDownPxAmount)
+        expansionListeners.forEach { it.onPanelExpansionChanged(expansionChangeEvent) }
     }
 
-    /** Updates the panel state if necessary.  */
+    /** Updates the panel state if necessary. */
     fun updateState(@PanelState state: Int) {
         debugLog("update state: ${this.state.stateToString()} -> ${state.stateToString()}")
         if (this.state != state) {
@@ -137,7 +144,7 @@ class PanelExpansionStateManager @Inject constructor() {
     }
 }
 
-/** Enum for the current state of the panel.  */
+/** Enum for the current state of the panel. */
 @Retention(AnnotationRetention.SOURCE)
 @IntDef(value = [STATE_CLOSED, STATE_OPENING, STATE_OPEN])
 internal annotation class PanelState
diff --git a/packages/SystemUI/tests/src/com/android/systemui/biometrics/UdfpsKeyguardViewControllerTest.java b/packages/SystemUI/tests/src/com/android/systemui/biometrics/UdfpsKeyguardViewControllerTest.java
index cd05ad496cc80..b87a7e78f73a3 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/biometrics/UdfpsKeyguardViewControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/biometrics/UdfpsKeyguardViewControllerTest.java
@@ -45,6 +45,7 @@ import com.android.systemui.statusbar.StatusBarState;
 import com.android.systemui.statusbar.phone.StatusBarKeyguardViewManager;
 import com.android.systemui.statusbar.phone.SystemUIDialogManager;
 import com.android.systemui.statusbar.phone.UnlockedScreenOffAnimationController;
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent;
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionListener;
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionStateManager;
 import com.android.systemui.statusbar.policy.ConfigurationController;
@@ -483,8 +484,11 @@ public class UdfpsKeyguardViewControllerTest extends SysuiTestCase {
     }
 
     private void updateStatusBarExpansion(float fraction, boolean expanded) {
+        PanelExpansionChangeEvent event =
+                new PanelExpansionChangeEvent(
+                        fraction, expanded, /* tracking= */ false, /* dragDownPxAmount= */ 0f);
         for (PanelExpansionListener listener : mExpansionListeners) {
-            listener.onPanelExpansionChanged(fraction, expanded, /* tracking= */ false);
+            listener.onPanelExpansionChanged(event);
         }
     }
 
diff --git a/packages/SystemUI/tests/src/com/android/systemui/dreams/touch/BouncerSwipeTouchHandlerTest.java b/packages/SystemUI/tests/src/com/android/systemui/dreams/touch/BouncerSwipeTouchHandlerTest.java
index d0b3d6d2d2c71..89c82fbff901d 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/dreams/touch/BouncerSwipeTouchHandlerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/dreams/touch/BouncerSwipeTouchHandlerTest.java
@@ -19,7 +19,6 @@ package com.android.systemui.dreams.touch;
 import static com.google.common.truth.Truth.assertThat;
 
 import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.anyFloat;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.never;
@@ -47,6 +46,7 @@ import com.android.systemui.statusbar.NotificationShadeWindowController;
 import com.android.systemui.statusbar.phone.CentralSurfaces;
 import com.android.systemui.statusbar.phone.KeyguardBouncer;
 import com.android.systemui.statusbar.phone.StatusBarKeyguardViewManager;
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent;
 import com.android.wm.shell.animation.FlingAnimationUtils;
 
 import org.junit.Before;
@@ -193,8 +193,7 @@ public class BouncerSwipeTouchHandlerTest extends SysuiTestCase {
         assertThat(gestureListener.onScroll(event1, event2, 0, distanceY))
                 .isTrue();
 
-        verify(mStatusBarKeyguardViewManager, never())
-                .onPanelExpansionChanged(anyFloat(), anyBoolean(), anyBoolean());
+        verify(mStatusBarKeyguardViewManager, never()).onPanelExpansionChanged(any());
     }
 
     /**
@@ -221,8 +220,7 @@ public class BouncerSwipeTouchHandlerTest extends SysuiTestCase {
         assertThat(gestureListener.onScroll(event1, event2, 0, distanceY))
                 .isTrue();
 
-        verify(mStatusBarKeyguardViewManager, never())
-                .onPanelExpansionChanged(anyFloat(), anyBoolean(), anyBoolean());
+        verify(mStatusBarKeyguardViewManager, never()).onPanelExpansionChanged(any());
     }
 
     /**
@@ -281,14 +279,16 @@ public class BouncerSwipeTouchHandlerTest extends SysuiTestCase {
                 .isTrue();
 
         // Ensure only called once
-        verify(mStatusBarKeyguardViewManager)
-                .onPanelExpansionChanged(anyFloat(), anyBoolean(), anyBoolean());
+        verify(mStatusBarKeyguardViewManager).onPanelExpansionChanged(any());
 
         final float expansion = isBouncerInitiallyShowing ? percent : 1 - percent;
+        final float dragDownAmount = event2.getY() - event1.getY();
 
         // Ensure correct expansion passed in.
-        verify(mStatusBarKeyguardViewManager).onPanelExpansionChanged(eq(expansion), eq(false),
-                eq(true));
+        PanelExpansionChangeEvent event =
+                new PanelExpansionChangeEvent(
+                        expansion, /* expanded= */ false, /* tracking= */ true, dragDownAmount);
+        verify(mStatusBarKeyguardViewManager).onPanelExpansionChanged(event);
     }
 
     /**
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/NotificationShadeDepthControllerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/statusbar/NotificationShadeDepthControllerTest.kt
index 1bcc038e93b60..b166b7367b532 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/NotificationShadeDepthControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/NotificationShadeDepthControllerTest.kt
@@ -31,6 +31,7 @@ import com.android.systemui.plugins.statusbar.StatusBarStateController
 import com.android.systemui.statusbar.phone.BiometricUnlockController
 import com.android.systemui.statusbar.phone.DozeParameters
 import com.android.systemui.statusbar.phone.ScrimController
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent
 import com.android.systemui.statusbar.policy.FakeConfigurationController
 import com.android.systemui.statusbar.policy.KeyguardStateController
 import com.android.systemui.util.WallpaperController
@@ -123,7 +124,7 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         verify(statusBarStateController).addCallback(captor.capture())
         statusBarStateListener = captor.value
         verify(notificationShadeWindowController)
-                .setScrimsVisibilityListener(scrimVisibilityCaptor.capture())
+            .setScrimsVisibilityListener(scrimVisibilityCaptor.capture())
 
         disableSplitShade()
     }
@@ -136,16 +137,16 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
     @Test
     fun onPanelExpansionChanged_apliesBlur_ifShade() {
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         verify(shadeAnimation).animateTo(eq(maxBlur), any())
     }
 
     @Test
     fun onPanelExpansionChanged_animatesBlurIn_ifShade() {
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 0.01f, expanded = false, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 0.01f, expanded = false, tracking = false, dragDownPxAmount = 0f))
         verify(shadeAnimation).animateTo(eq(maxBlur), any())
     }
 
@@ -154,28 +155,27 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         onPanelExpansionChanged_animatesBlurIn_ifShade()
         clearInvocations(shadeAnimation)
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 0f, expanded = false, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 0f, expanded = false, tracking = false, dragDownPxAmount = 0f))
         verify(shadeAnimation).animateTo(eq(0), any())
     }
 
     @Test
     fun onPanelExpansionChanged_animatesBlurOut_ifFlick() {
+        val event =
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f)
         onPanelExpansionChanged_apliesBlur_ifShade()
         clearInvocations(shadeAnimation)
-        notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = true
-        )
+        notificationShadeDepthController.onPanelExpansionChanged(event)
         verify(shadeAnimation, never()).animateTo(anyInt(), any())
 
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 0.9f, expanded = true, tracking = true
-        )
+            event.copy(fraction = 0.9f, tracking = true))
         verify(shadeAnimation, never()).animateTo(anyInt(), any())
 
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 0.8f, expanded = true, tracking = false
-        )
+            event.copy(fraction = 0.8f, tracking = false))
         verify(shadeAnimation).animateTo(eq(0), any())
     }
 
@@ -184,27 +184,24 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         onPanelExpansionChanged_animatesBlurOut_ifFlick()
         clearInvocations(shadeAnimation)
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 0.6f, expanded = true, tracking = true
-        )
+            PanelExpansionChangeEvent(
+                fraction = 0.6f, expanded = true, tracking = true, dragDownPxAmount = 0f))
         verify(shadeAnimation).animateTo(eq(maxBlur), any())
     }
 
     @Test
     fun onPanelExpansionChanged_respectsMinPanelPullDownFraction() {
+        val event =
+            PanelExpansionChangeEvent(
+                fraction = 0.5f, expanded = true, tracking = true, dragDownPxAmount = 0f)
         notificationShadeDepthController.panelPullDownMinFraction = 0.5f
-        notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 0.5f, expanded = true, tracking = true
-        )
+        notificationShadeDepthController.onPanelExpansionChanged(event)
         assertThat(notificationShadeDepthController.shadeExpansion).isEqualTo(0f)
 
-        notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 0.75f, expanded = true, tracking = true
-        )
+        notificationShadeDepthController.onPanelExpansionChanged(event.copy(fraction = 0.75f))
         assertThat(notificationShadeDepthController.shadeExpansion).isEqualTo(0.5f)
 
-        notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = true
-        )
+        notificationShadeDepthController.onPanelExpansionChanged(event.copy(fraction = 1f))
         assertThat(notificationShadeDepthController.shadeExpansion).isEqualTo(1f)
     }
 
@@ -223,8 +220,8 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         statusBarState = StatusBarState.KEYGUARD
         notificationShadeDepthController.qsPanelExpansion = 1f
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
         verify(blurUtils).applyBlur(any(), eq(maxBlur), eq(false))
     }
@@ -234,11 +231,11 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         statusBarState = StatusBarState.KEYGUARD
         notificationShadeDepthController.qsPanelExpansion = 0.25f
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
-        verify(wallpaperController).setNotificationShadeZoom(
-                eq(ShadeInterpolation.getNotificationScrimAlpha(0.25f)))
+        verify(wallpaperController)
+            .setNotificationShadeZoom(eq(ShadeInterpolation.getNotificationScrimAlpha(0.25f)))
     }
 
     @Test
@@ -246,7 +243,8 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         enableSplitShade()
 
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false)
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
 
         verify(wallpaperController).setNotificationShadeZoom(0f)
@@ -257,7 +255,8 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         disableSplitShade()
 
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false)
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
 
         verify(wallpaperController).setNotificationShadeZoom(floatThat { it > 0 })
@@ -269,14 +268,16 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         val rawFraction = 1f
         val expanded = true
         val tracking = false
+        val dragDownPxAmount = 0f
+        val event = PanelExpansionChangeEvent(rawFraction, expanded, tracking, dragDownPxAmount)
         val inOrder = Mockito.inOrder(wallpaperController)
 
-        notificationShadeDepthController.onPanelExpansionChanged(rawFraction, expanded, tracking)
+        notificationShadeDepthController.onPanelExpansionChanged(event)
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
         inOrder.verify(wallpaperController).setNotificationShadeZoom(floatThat { it > 0 })
 
         enableSplitShade()
-        notificationShadeDepthController.onPanelExpansionChanged(rawFraction, expanded, tracking)
+        notificationShadeDepthController.onPanelExpansionChanged(event)
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
         inOrder.verify(wallpaperController).setNotificationShadeZoom(0f)
     }
@@ -332,8 +333,8 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
     @Test
     fun updateBlurCallback_setsBlur_whenExpanded() {
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         `when`(shadeAnimation.radius).thenReturn(maxBlur.toFloat())
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
         verify(blurUtils).applyBlur(any(), eq(maxBlur), eq(false))
@@ -342,8 +343,8 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
     @Test
     fun updateBlurCallback_ignoreShadeBlurUntilHidden_overridesZoom() {
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         `when`(shadeAnimation.radius).thenReturn(maxBlur.toFloat())
         notificationShadeDepthController.blursDisabledForAppLaunch = true
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
@@ -353,15 +354,15 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
     @Test
     fun ignoreShadeBlurUntilHidden_schedulesFrame() {
         notificationShadeDepthController.blursDisabledForAppLaunch = true
-        verify(choreographer).postFrameCallback(
-                eq(notificationShadeDepthController.updateBlurCallback))
+        verify(choreographer)
+            .postFrameCallback(eq(notificationShadeDepthController.updateBlurCallback))
     }
 
     @Test
     fun ignoreBlurForUnlock_ignores() {
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         `when`(shadeAnimation.radius).thenReturn(maxBlur.toFloat())
 
         notificationShadeDepthController.blursDisabledForAppLaunch = false
@@ -377,8 +378,8 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
     @Test
     fun ignoreBlurForUnlock_doesNotIgnore() {
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         `when`(shadeAnimation.radius).thenReturn(maxBlur.toFloat())
 
         notificationShadeDepthController.blursDisabledForAppLaunch = false
@@ -409,8 +410,8 @@ class NotificationShadeDepthControllerTest : SysuiTestCase() {
         `when`(brightnessSpring.ratio).thenReturn(1f)
         // And shade is blurred
         notificationShadeDepthController.onPanelExpansionChanged(
-            rawFraction = 1f, expanded = true, tracking = false
-        )
+            PanelExpansionChangeEvent(
+                fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f))
         `when`(shadeAnimation.radius).thenReturn(maxBlur.toFloat())
 
         notificationShadeDepthController.updateBlurCallback.doFrame(0)
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManagerTest.java b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManagerTest.java
index 2b018727eb98c..a94ad0b763aa1 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManagerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManagerTest.java
@@ -50,6 +50,7 @@ import com.android.systemui.plugins.ActivityStarter.OnDismissAction;
 import com.android.systemui.statusbar.NotificationMediaManager;
 import com.android.systemui.statusbar.NotificationShadeWindowController;
 import com.android.systemui.statusbar.SysuiStatusBarStateController;
+import com.android.systemui.statusbar.phone.panelstate.PanelExpansionChangeEvent;
 import com.android.systemui.statusbar.phone.panelstate.PanelExpansionStateManager;
 import com.android.systemui.statusbar.policy.ConfigurationController;
 import com.android.systemui.statusbar.policy.KeyguardStateController;
@@ -70,48 +71,30 @@ import java.util.Optional;
 @TestableLooper.RunWithLooper
 public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
 
-    @Mock
-    private ViewMediatorCallback mViewMediatorCallback;
-    @Mock
-    private LockPatternUtils mLockPatternUtils;
-    @Mock
-    private KeyguardStateController mKeyguardStateController;
-    @Mock
-    private CentralSurfaces mCentralSurfaces;
-    @Mock
-    private ViewGroup mContainer;
-    @Mock
-    private NotificationPanelViewController mNotificationPanelView;
-    @Mock
-    private BiometricUnlockController mBiometricUnlockController;
-    @Mock
-    private SysuiStatusBarStateController mStatusBarStateController;
-    @Mock
-    private KeyguardUpdateMonitor mKeyguardUpdateMonitor;
-    @Mock
-    private View mNotificationContainer;
-    @Mock
-    private KeyguardBypassController mBypassController;
-    @Mock
-    private KeyguardBouncer.Factory mKeyguardBouncerFactory;
-    @Mock
-    private KeyguardMessageAreaController.Factory mKeyguardMessageAreaFactory;
-    @Mock
-    private KeyguardMessageAreaController mKeyguardMessageAreaController;
-    @Mock
-    private KeyguardBouncer mBouncer;
-    @Mock
-    private StatusBarKeyguardViewManager.AlternateAuthInterceptor mAlternateAuthInterceptor;
-    @Mock
-    private KeyguardMessageArea mKeyguardMessageArea;
-    @Mock
-    private ShadeController mShadeController;
-    @Mock
-    private SysUIUnfoldComponent mSysUiUnfoldComponent;
-    @Mock
-    private DreamOverlayStateController mDreamOverlayStateController;
-    @Mock
-    private LatencyTracker mLatencyTracker;
+    private static final PanelExpansionChangeEvent EXPANSION_EVENT =
+            expansionEvent(/* fraction= */ 0.5f, /* expanded= */ false, /* tracking= */ true);
+
+    @Mock private ViewMediatorCallback mViewMediatorCallback;
+    @Mock private LockPatternUtils mLockPatternUtils;
+    @Mock private KeyguardStateController mKeyguardStateController;
+    @Mock private CentralSurfaces mCentralSurfaces;
+    @Mock private ViewGroup mContainer;
+    @Mock private NotificationPanelViewController mNotificationPanelView;
+    @Mock private BiometricUnlockController mBiometricUnlockController;
+    @Mock private SysuiStatusBarStateController mStatusBarStateController;
+    @Mock private KeyguardUpdateMonitor mKeyguardUpdateMonitor;
+    @Mock private View mNotificationContainer;
+    @Mock private KeyguardBypassController mBypassController;
+    @Mock private KeyguardBouncer.Factory mKeyguardBouncerFactory;
+    @Mock private KeyguardMessageAreaController.Factory mKeyguardMessageAreaFactory;
+    @Mock private KeyguardMessageAreaController mKeyguardMessageAreaController;
+    @Mock private KeyguardBouncer mBouncer;
+    @Mock private StatusBarKeyguardViewManager.AlternateAuthInterceptor mAlternateAuthInterceptor;
+    @Mock private KeyguardMessageArea mKeyguardMessageArea;
+    @Mock private ShadeController mShadeController;
+    @Mock private SysUIUnfoldComponent mSysUiUnfoldComponent;
+    @Mock private DreamOverlayStateController mDreamOverlayStateController;
+    @Mock private LatencyTracker mLatencyTracker;
 
     private StatusBarKeyguardViewManager mStatusBarKeyguardViewManager;
 
@@ -119,31 +102,31 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
     public void setUp() {
         MockitoAnnotations.initMocks(this);
         when(mKeyguardBouncerFactory.create(
-                any(ViewGroup.class),
-                any(KeyguardBouncer.BouncerExpansionCallback.class)))
+                        any(ViewGroup.class), any(KeyguardBouncer.BouncerExpansionCallback.class)))
                 .thenReturn(mBouncer);
         when(mCentralSurfaces.getBouncerContainer()).thenReturn(mContainer);
         when(mContainer.findViewById(anyInt())).thenReturn(mKeyguardMessageArea);
         when(mKeyguardMessageAreaFactory.create(any(KeyguardMessageArea.class)))
                 .thenReturn(mKeyguardMessageAreaController);
-        mStatusBarKeyguardViewManager = new StatusBarKeyguardViewManager(
-                getContext(),
-                mViewMediatorCallback,
-                mLockPatternUtils,
-                mStatusBarStateController,
-                mock(ConfigurationController.class),
-                mKeyguardUpdateMonitor,
-                mDreamOverlayStateController,
-                mock(NavigationModeController.class),
-                mock(DockManager.class),
-                mock(NotificationShadeWindowController.class),
-                mKeyguardStateController,
-                mock(NotificationMediaManager.class),
-                mKeyguardBouncerFactory,
-                mKeyguardMessageAreaFactory,
-                Optional.of(mSysUiUnfoldComponent),
-                () -> mShadeController,
-                mLatencyTracker);
+        mStatusBarKeyguardViewManager =
+                new StatusBarKeyguardViewManager(
+                        getContext(),
+                        mViewMediatorCallback,
+                        mLockPatternUtils,
+                        mStatusBarStateController,
+                        mock(ConfigurationController.class),
+                        mKeyguardUpdateMonitor,
+                        mDreamOverlayStateController,
+                        mock(NavigationModeController.class),
+                        mock(DockManager.class),
+                        mock(NotificationShadeWindowController.class),
+                        mKeyguardStateController,
+                        mock(NotificationMediaManager.class),
+                        mKeyguardBouncerFactory,
+                        mKeyguardMessageAreaFactory,
+                        Optional.of(mSysUiUnfoldComponent),
+                        () -> mShadeController,
+                        mLatencyTracker);
         mStatusBarKeyguardViewManager.registerCentralSurfaces(
                 mCentralSurfaces,
                 mNotificationPanelView,
@@ -159,8 +142,8 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
     public void dismissWithAction_AfterKeyguardGoneSetToFalse() {
         OnDismissAction action = () -> false;
         Runnable cancelAction = () -> {};
-        mStatusBarKeyguardViewManager.dismissWithAction(action, cancelAction,
-                false /* afterKeyguardGone */);
+        mStatusBarKeyguardViewManager.dismissWithAction(
+                action, cancelAction, false /* afterKeyguardGone */);
         verify(mBouncer).showWithDismissAction(eq(action), eq(cancelAction));
     }
 
@@ -191,67 +174,46 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
     public void onPanelExpansionChanged_neverHidesScrimmedBouncer() {
         when(mBouncer.isShowing()).thenReturn(true);
         when(mBouncer.isScrimmed()).thenReturn(true);
-        mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ 0.5f,
-                /* expanded= */ false,
-                /* tracking= */ true);
+        mStatusBarKeyguardViewManager.onPanelExpansionChanged(EXPANSION_EVENT);
         verify(mBouncer).setExpansion(eq(KeyguardBouncer.EXPANSION_VISIBLE));
     }
 
     @Test
     public void onPanelExpansionChanged_neverShowsDuringHintAnimation() {
         when(mNotificationPanelView.isUnlockHintRunning()).thenReturn(true);
-        mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ 0.5f,
-                /* expanded= */ false,
-                /* tracking= */ true);
+        mStatusBarKeyguardViewManager.onPanelExpansionChanged(EXPANSION_EVENT);
         verify(mBouncer).setExpansion(eq(KeyguardBouncer.EXPANSION_HIDDEN));
     }
 
     @Test
     public void onPanelExpansionChanged_propagatesToBouncer() {
-        mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ 0.5f,
-                /* expanded= */ false,
-                /* tracking= */ true);
+        mStatusBarKeyguardViewManager.onPanelExpansionChanged(EXPANSION_EVENT);
         verify(mBouncer).setExpansion(eq(0.5f));
     }
 
     @Test
     public void onPanelExpansionChanged_showsBouncerWhenSwiping() {
         when(mKeyguardStateController.canDismissLockScreen()).thenReturn(false);
-        mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ 0.5f,
-                /* expanded= */ false,
-                /* tracking= */ true);
+        mStatusBarKeyguardViewManager.onPanelExpansionChanged(EXPANSION_EVENT);
         verify(mBouncer).show(eq(false), eq(false));
 
         // But not when it's already visible
         reset(mBouncer);
         when(mBouncer.isShowing()).thenReturn(true);
-        mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ 0.5f,
-                /* expanded= */ false,
-                /* tracking= */ true);
+        mStatusBarKeyguardViewManager.onPanelExpansionChanged(EXPANSION_EVENT);
         verify(mBouncer, never()).show(eq(false), eq(false));
 
         // Or animating away
         reset(mBouncer);
         when(mBouncer.isAnimatingAway()).thenReturn(true);
-        mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ 0.5f,
-                /* expanded= */ false,
-                /* tracking= */ true);
+        mStatusBarKeyguardViewManager.onPanelExpansionChanged(EXPANSION_EVENT);
         verify(mBouncer, never()).show(eq(false), eq(false));
     }
 
     @Test
     public void onPanelExpansionChanged_neverTranslatesBouncerWhenOccluded() {
         mStatusBarKeyguardViewManager.setOccluded(true /* occluded */, false /* animate */);
-        mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ 0.5f,
-                /* expanded= */ false,
-                /* tracking= */ true);
+        mStatusBarKeyguardViewManager.onPanelExpansionChanged(EXPANSION_EVENT);
         verify(mBouncer, never()).setExpansion(eq(0.5f));
     }
 
@@ -260,9 +222,10 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
         when(mBiometricUnlockController.getMode())
                 .thenReturn(BiometricUnlockController.MODE_WAKE_AND_UNLOCK);
         mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ KeyguardBouncer.EXPANSION_VISIBLE,
-                /* expanded= */ true,
-                /* tracking= */ false);
+                expansionEvent(
+                        /* fraction= */ KeyguardBouncer.EXPANSION_VISIBLE,
+                        /* expanded= */ true,
+                        /* tracking= */ false));
         verify(mBouncer, never()).setExpansion(anyFloat());
     }
 
@@ -270,9 +233,10 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
     public void onPanelExpansionChanged_neverTranslatesBouncerWhenLaunchingApp() {
         when(mCentralSurfaces.isInLaunchTransition()).thenReturn(true);
         mStatusBarKeyguardViewManager.onPanelExpansionChanged(
-                /* fraction= */ KeyguardBouncer.EXPANSION_VISIBLE,
-                /* expanded= */ true,
-                /* tracking= */ false);
+                expansionEvent(
+                        /* fraction= */ KeyguardBouncer.EXPANSION_VISIBLE,
+                        /* expanded= */ true,
+                        /* tracking= */ false));
         verify(mBouncer, never()).setExpansion(anyFloat());
     }
 
@@ -336,8 +300,8 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
     public void testHiding_cancelsGoneRunnable() {
         OnDismissAction action = mock(OnDismissAction.class);
         Runnable cancelAction = mock(Runnable.class);
-        mStatusBarKeyguardViewManager.dismissWithAction(action, cancelAction,
-                true /* afterKeyguardGone */);
+        mStatusBarKeyguardViewManager.dismissWithAction(
+                action, cancelAction, true /* afterKeyguardGone */);
 
         mStatusBarKeyguardViewManager.hideBouncer(true);
         mStatusBarKeyguardViewManager.hide(0, 30);
@@ -349,8 +313,8 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
     public void testHiding_doesntCancelWhenShowing() {
         OnDismissAction action = mock(OnDismissAction.class);
         Runnable cancelAction = mock(Runnable.class);
-        mStatusBarKeyguardViewManager.dismissWithAction(action, cancelAction,
-                true /* afterKeyguardGone */);
+        mStatusBarKeyguardViewManager.dismissWithAction(
+                action, cancelAction, true /* afterKeyguardGone */);
 
         mStatusBarKeyguardViewManager.hide(0, 30);
         verify(action).onDismiss();
@@ -362,7 +326,8 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
         mStatusBarKeyguardViewManager.setAlternateAuthInterceptor(mAlternateAuthInterceptor);
         when(mBouncer.isShowing()).thenReturn(false);
         when(mAlternateAuthInterceptor.isShowingAlternateAuthBouncer()).thenReturn(true);
-        assertTrue("Is showing not accurate when alternative auth showing",
+        assertTrue(
+                "Is showing not accurate when alternative auth showing",
                 mStatusBarKeyguardViewManager.isShowing());
     }
 
@@ -371,7 +336,8 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
         mStatusBarKeyguardViewManager.setAlternateAuthInterceptor(mAlternateAuthInterceptor);
         when(mBouncer.isShowing()).thenReturn(false);
         when(mAlternateAuthInterceptor.isShowingAlternateAuthBouncer()).thenReturn(true);
-        assertTrue("Is or will be showing not accurate when alternative auth showing",
+        assertTrue(
+                "Is or will be showing not accurate when alternative auth showing",
                 mStatusBarKeyguardViewManager.bouncerIsOrWillBeShowing());
     }
 
@@ -412,8 +378,7 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
         // GIVEN alt auth exists, unlocking with biometric is allowed
         mStatusBarKeyguardViewManager.setAlternateAuthInterceptor(mAlternateAuthInterceptor);
         when(mBouncer.isShowing()).thenReturn(false);
-        when(mKeyguardUpdateMonitor.isUnlockingWithBiometricAllowed(anyBoolean()))
-                .thenReturn(true);
+        when(mKeyguardUpdateMonitor.isUnlockingWithBiometricAllowed(anyBoolean())).thenReturn(true);
 
         // WHEN showGenericBouncer is called
         mStatusBarKeyguardViewManager.showGenericBouncer(true);
@@ -446,4 +411,10 @@ public class StatusBarKeyguardViewManagerTest extends SysuiTestCase {
         mBouncer = null;
         Truth.assertThat(mStatusBarKeyguardViewManager.isBouncerInTransit()).isFalse();
     }
+
+    private static PanelExpansionChangeEvent expansionEvent(
+            float fraction, boolean expanded, boolean tracking) {
+        return new PanelExpansionChangeEvent(
+                fraction, expanded, tracking, /* dragDownPxAmount= */ 0f);
+    }
 }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionStateManagerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionStateManagerTest.kt
index 32bad5c084f5d..c4f80492b0849 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionStateManagerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/panelstate/PanelExpansionStateManagerTest.kt
@@ -39,12 +39,15 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         val fraction = 0.6f
         val expanded = true
         val tracking = true
+        val dragDownAmount = 1234f
 
-        panelExpansionStateManager.onPanelExpansionChanged(fraction, expanded, tracking)
+        panelExpansionStateManager.onPanelExpansionChanged(
+            fraction, expanded, tracking, dragDownAmount)
 
         assertThat(listener.fraction).isEqualTo(fraction)
         assertThat(listener.expanded).isEqualTo(expanded)
         assertThat(listener.tracking).isEqualTo(tracking)
+        assertThat(listener.dragDownAmountPx).isEqualTo(dragDownAmount)
     }
 
     @Test
@@ -52,7 +55,9 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         val fraction = 0.6f
         val expanded = true
         val tracking = true
-        panelExpansionStateManager.onPanelExpansionChanged(fraction, expanded, tracking)
+        val dragDownAmount = 1234f
+        panelExpansionStateManager.onPanelExpansionChanged(
+            fraction, expanded, tracking, dragDownAmount)
         val listener = TestPanelExpansionListener()
 
         panelExpansionStateManager.addExpansionListener(listener)
@@ -60,6 +65,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         assertThat(listener.fraction).isEqualTo(fraction)
         assertThat(listener.expanded).isEqualTo(expanded)
         assertThat(listener.tracking).isEqualTo(tracking)
+        assertThat(listener.dragDownAmountPx).isEqualTo(dragDownAmount)
     }
 
     @Test
@@ -82,8 +88,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         panelExpansionStateManager.addStateListener(listener)
 
         panelExpansionStateManager.onPanelExpansionChanged(
-            fraction = 0.5f, expanded = true, tracking = false
-        )
+            fraction = 0.5f, expanded = true, tracking = false, dragDownPxAmount = 0f)
 
         assertThat(listener.state).isEqualTo(STATE_OPENING)
     }
@@ -94,8 +99,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         panelExpansionStateManager.addStateListener(listener)
 
         panelExpansionStateManager.onPanelExpansionChanged(
-            fraction = 0.5f, expanded = true, tracking = true
-        )
+            fraction = 0.5f, expanded = true, tracking = true, dragDownPxAmount = 0f)
 
         assertThat(listener.state).isEqualTo(STATE_OPENING)
     }
@@ -108,8 +112,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         panelExpansionStateManager.updateState(STATE_OPEN)
 
         panelExpansionStateManager.onPanelExpansionChanged(
-            fraction = 0.5f, expanded = false, tracking = false
-        )
+            fraction = 0.5f, expanded = false, tracking = false, dragDownPxAmount = 0f)
 
         assertThat(listener.state).isEqualTo(STATE_CLOSED)
     }
@@ -122,8 +125,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         panelExpansionStateManager.updateState(STATE_OPEN)
 
         panelExpansionStateManager.onPanelExpansionChanged(
-            fraction = 0.5f, expanded = false, tracking = true
-        )
+            fraction = 0.5f, expanded = false, tracking = true, dragDownPxAmount = 0f)
 
         assertThat(listener.state).isEqualTo(STATE_OPEN)
     }
@@ -136,8 +138,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         panelExpansionStateManager.addStateListener(listener)
 
         panelExpansionStateManager.onPanelExpansionChanged(
-            fraction = 1f, expanded = true, tracking = false
-        )
+            fraction = 1f, expanded = true, tracking = false, dragDownPxAmount = 0f)
 
         assertThat(listener.previousState).isEqualTo(STATE_OPENING)
         assertThat(listener.state).isEqualTo(STATE_OPEN)
@@ -149,8 +150,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         panelExpansionStateManager.addStateListener(listener)
 
         panelExpansionStateManager.onPanelExpansionChanged(
-            fraction = 1f, expanded = true, tracking = true
-        )
+            fraction = 1f, expanded = true, tracking = true, dragDownPxAmount = 0f)
 
         assertThat(listener.state).isEqualTo(STATE_OPENING)
     }
@@ -163,8 +163,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         panelExpansionStateManager.updateState(STATE_OPEN)
 
         panelExpansionStateManager.onPanelExpansionChanged(
-            fraction = 1f, expanded = false, tracking = false
-        )
+            fraction = 1f, expanded = false, tracking = false, dragDownPxAmount = 0f)
 
         assertThat(listener.state).isEqualTo(STATE_CLOSED)
     }
@@ -177,8 +176,7 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         panelExpansionStateManager.updateState(STATE_OPEN)
 
         panelExpansionStateManager.onPanelExpansionChanged(
-            fraction = 1f, expanded = false, tracking = true
-        )
+            fraction = 1f, expanded = false, tracking = true, dragDownPxAmount = 0f)
 
         assertThat(listener.state).isEqualTo(STATE_OPEN)
     }
@@ -189,15 +187,13 @@ class PanelExpansionStateManagerTest : SysuiTestCase() {
         var fraction: Float = 0f
         var expanded: Boolean = false
         var tracking: Boolean = false
+        var dragDownAmountPx: Float = 0f
 
-        override fun onPanelExpansionChanged(
-            fraction: Float,
-            expanded: Boolean,
-            tracking: Boolean
-        ) {
-            this.fraction = fraction
-            this.expanded = expanded
-            this.tracking = tracking
+        override fun onPanelExpansionChanged(event: PanelExpansionChangeEvent) {
+            this.fraction = event.fraction
+            this.expanded = event.expanded
+            this.tracking = event.tracking
+            this.dragDownAmountPx = event.dragDownPxAmount
         }
     }