Merge "Transition away notifications when entering glanceable hub" into main
diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModelTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModelTest.kt
index cceb767..6cc680b 100644
--- a/packages/SystemUI/multivalentTests/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModelTest.kt
+++ b/packages/SystemUI/multivalentTests/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModelTest.kt
@@ -25,10 +25,14 @@
 import com.android.systemui.Flags as AConfigFlags
 import com.android.systemui.Flags.FLAG_NEW_AOD_TRANSITION
 import com.android.systemui.SysuiTestCase
+import com.android.systemui.communal.data.repository.communalRepository
+import com.android.systemui.communal.shared.model.CommunalSceneKey
+import com.android.systemui.communal.shared.model.ObservableCommunalTransitionState
 import com.android.systemui.coroutines.collectLastValue
 import com.android.systemui.deviceentry.data.repository.fakeDeviceEntryRepository
 import com.android.systemui.keyguard.data.repository.fakeKeyguardRepository
 import com.android.systemui.keyguard.data.repository.fakeKeyguardTransitionRepository
+import com.android.systemui.keyguard.domain.interactor.keyguardInteractor
 import com.android.systemui.keyguard.shared.model.KeyguardState
 import com.android.systemui.keyguard.shared.model.TransitionState
 import com.android.systemui.keyguard.shared.model.TransitionStep
@@ -43,6 +47,7 @@
 import com.android.systemui.util.ui.value
 import com.google.common.truth.Truth.assertThat
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.test.runCurrent
 import kotlinx.coroutines.test.runTest
 import org.junit.Before
@@ -55,7 +60,9 @@
     private val kosmos = testKosmos()
     private val testScope = kosmos.testScope
     private val keyguardTransitionRepository = kosmos.fakeKeyguardTransitionRepository
+    private val keyguardInteractor = kosmos.keyguardInteractor
     private val keyguardRepository = kosmos.fakeKeyguardRepository
+    private val communalRepository = kosmos.communalRepository
     private val screenOffAnimationController = kosmos.screenOffAnimationController
     private val deviceEntryRepository = kosmos.fakeDeviceEntryRepository
     private val notificationsKeyguardInteractor = kosmos.notificationsKeyguardInteractor
@@ -220,7 +227,25 @@
         }
 
     @Test
-    fun alpha_glanceableHubOpen_isZero() =
+    fun alpha_idleOnHub_isZero() =
+        testScope.runTest {
+            val alpha by collectLastValue(underTest.alpha)
+
+            // Hub transition state is idle with hub open.
+            communalRepository.setTransitionState(
+                flowOf(ObservableCommunalTransitionState.Idle(CommunalSceneKey.Communal))
+            )
+            runCurrent()
+
+            // Set keyguard alpha to 1.0f.
+            keyguardInteractor.setAlpha(1.0f)
+
+            // Alpha property remains 0 regardless.
+            assertThat(alpha).isEqualTo(0f)
+        }
+
+    @Test
+    fun alpha_transitionToHub_isZero() =
         testScope.runTest {
             val alpha by collectLastValue(underTest.alpha)
 
@@ -234,7 +259,7 @@
         }
 
     @Test
-    fun alpha_glanceableHubClosed_isOne() =
+    fun alpha_transitionFromHubToLockscreen_isOne() =
         testScope.runTest {
             val alpha by collectLastValue(underTest.alpha)
 
diff --git a/packages/SystemUI/res/values/dimens.xml b/packages/SystemUI/res/values/dimens.xml
index c630a7f..e8201ecb 100644
--- a/packages/SystemUI/res/values/dimens.xml
+++ b/packages/SystemUI/res/values/dimens.xml
@@ -1728,6 +1728,10 @@
     <dimen name="communal_grid_height">630dp</dimen>
     <!-- Number of columns for each communal card -->
     <integer name="communal_grid_columns_per_card">6</integer>
+    <!-- Width of area on right edge of screen in which swipes will open the communal hub -->
+    <dimen name="communal_right_edge_swipe_region_width">16dp</dimen>
+    <!-- Height of area at top of communal hub where swipes should open the notification shade -->
+    <dimen name="communal_top_edge_swipe_region_height">32dp</dimen>
 
     <dimen name="drag_and_drop_icon_size">70dp</dimen>
 
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/FromGlanceableHubTransitionInteractor.kt b/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/FromGlanceableHubTransitionInteractor.kt
index 3292ea8..4df5d50 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/FromGlanceableHubTransitionInteractor.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/FromGlanceableHubTransitionInteractor.kt
@@ -95,6 +95,7 @@
 
     companion object {
         const val TAG = "FromGlanceableHubTransitionInteractor"
-        val DEFAULT_DURATION = 500.milliseconds
+        val DEFAULT_DURATION = 400.milliseconds
+        val TO_LOCKSCREEN_DURATION = DEFAULT_DURATION
     }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/GlanceableHubToLockscreenTransitionViewModel.kt b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/GlanceableHubToLockscreenTransitionViewModel.kt
index bc51821..6aa2eca 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/GlanceableHubToLockscreenTransitionViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/GlanceableHubToLockscreenTransitionViewModel.kt
@@ -17,7 +17,7 @@
 package com.android.systemui.keyguard.ui.viewmodel
 
 import com.android.systemui.dagger.SysUISingleton
-import com.android.systemui.keyguard.domain.interactor.FromLockscreenTransitionInteractor
+import com.android.systemui.keyguard.domain.interactor.FromGlanceableHubTransitionInteractor
 import com.android.systemui.keyguard.shared.model.KeyguardState
 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
 import javax.inject.Inject
@@ -37,7 +37,7 @@
 ) {
     private val transitionAnimation =
         animationFlow.setup(
-            duration = FromLockscreenTransitionInteractor.TO_GLANCEABLE_HUB_DURATION,
+            duration = FromGlanceableHubTransitionInteractor.TO_LOCKSCREEN_DURATION,
             from = KeyguardState.GLANCEABLE_HUB,
             to = KeyguardState.LOCKSCREEN,
         )
@@ -45,10 +45,20 @@
     // TODO(b/315205222): implement full animation spec instead of just a simple fade.
     val keyguardAlpha: Flow<Float> =
         transitionAnimation.sharedFlow(
-            duration = FromLockscreenTransitionInteractor.TO_GLANCEABLE_HUB_DURATION,
+            duration = FromGlanceableHubTransitionInteractor.TO_LOCKSCREEN_DURATION,
             onStep = { it },
             onFinish = { 1f },
             onCancel = { 0f },
             name = "GLANCEABLE_HUB->LOCKSCREEN: keyguardAlpha",
         )
+
+    // TODO(b/315205216): implement full animation spec instead of just a simple fade.
+    val notificationAlpha: Flow<Float> =
+        transitionAnimation.sharedFlow(
+            duration = FromGlanceableHubTransitionInteractor.TO_LOCKSCREEN_DURATION,
+            onStep = { it },
+            onFinish = { 1f },
+            onCancel = { 0f },
+            name = "GLANCEABLE_HUB->LOCKSCREEN: notificationAlpha",
+        )
 }
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModel.kt b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModel.kt
index ea66702..709e184 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModel.kt
@@ -21,6 +21,7 @@
 import android.view.View.VISIBLE
 import com.android.systemui.Flags.newAodTransition
 import com.android.systemui.common.shared.model.NotificationContainerBounds
+import com.android.systemui.communal.domain.interactor.CommunalInteractor
 import com.android.systemui.dagger.SysUISingleton
 import com.android.systemui.deviceentry.domain.interactor.DeviceEntryInteractor
 import com.android.systemui.keyguard.domain.interactor.KeyguardInteractor
@@ -56,6 +57,7 @@
     private val deviceEntryInteractor: DeviceEntryInteractor,
     private val dozeParameters: DozeParameters,
     private val keyguardInteractor: KeyguardInteractor,
+    communalInteractor: CommunalInteractor,
     keyguardTransitionInteractor: KeyguardTransitionInteractor,
     private val notificationsKeyguardInteractor: NotificationsKeyguardInteractor,
     aodToLockscreenTransitionViewModel: AodToLockscreenTransitionViewModel,
@@ -88,11 +90,23 @@
 
     /** An observable for the alpha level for the entire keyguard root view. */
     val alpha: Flow<Float> =
-        merge(
-                aodAlphaViewModel.alpha,
-                lockscreenToGlanceableHubTransitionViewModel.keyguardAlpha,
-                glanceableHubToLockscreenTransitionViewModel.keyguardAlpha,
-            )
+        combine(
+                communalInteractor.isIdleOnCommunal,
+                merge(
+                    aodAlphaViewModel.alpha,
+                    lockscreenToGlanceableHubTransitionViewModel.keyguardAlpha,
+                    glanceableHubToLockscreenTransitionViewModel.keyguardAlpha,
+                )
+            ) { isIdleOnCommunal, alpha ->
+                if (isIdleOnCommunal) {
+                    // Keyguard should not show while the communal hub is fully visible. This check
+                    // is added since at the moment, closing the notification shade will cause the
+                    // keyguard alpha to be set back to 1.
+                    0f
+                } else {
+                    alpha
+                }
+            }
             .distinctUntilChanged()
 
     /** Specific alpha value for elements visible during [KeyguardState.LOCKSCREEN] */
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/LockscreenToGlanceableHubTransitionViewModel.kt b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/LockscreenToGlanceableHubTransitionViewModel.kt
index 3ea83ae..3afa49e 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/LockscreenToGlanceableHubTransitionViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/LockscreenToGlanceableHubTransitionViewModel.kt
@@ -51,4 +51,14 @@
             onCancel = { 1f },
             name = "LOCKSCREEN->GLANCEABLE_HUB: keyguardAlpha",
         )
+
+    // TODO(b/315205216): implement full animation spec instead of just a simple fade.
+    val notificationAlpha: Flow<Float> =
+        transitionAnimation.sharedFlow(
+            duration = FromLockscreenTransitionInteractor.TO_GLANCEABLE_HUB_DURATION,
+            onStep = { 1f - it },
+            onFinish = { 0f },
+            onCancel = { 1f },
+            name = "LOCKSCREEN->GLANCEABLE_HUB: notificationAlpha",
+        )
 }
diff --git a/packages/SystemUI/src/com/android/systemui/shade/GlanceableHubContainerController.kt b/packages/SystemUI/src/com/android/systemui/shade/GlanceableHubContainerController.kt
index 782d651..3362ebc 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/GlanceableHubContainerController.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/GlanceableHubContainerController.kt
@@ -55,7 +55,15 @@
      * The width of the area in which a right edge swipe can open the hub, in pixels. Read from
      * resources when [initView] is called.
      */
-    private var edgeSwipeRegionWidth: Int = 0
+    // TODO(b/320786721): support RTL layouts
+    private var rightEdgeSwipeRegionWidth: Int = 0
+
+    /**
+     * The height of the area in which a top edge swipe while the hub is open will not intercept
+     * touches, in pixels. This allows the top edge swipe to instead open the notification shade.
+     * Read from resources when [initView] is called.
+     */
+    private var topEdgeSwipeRegionWidth: Int = 0
 
     /**
      * True if we are currently tracking a gesture for opening the hub that started in the edge
@@ -63,6 +71,9 @@
      */
     private var isTrackingOpenGesture = false
 
+    /** True if we are currently tracking a touch on the hub while it's open. */
+    private var isTrackingHubTouch = false
+
     /**
      * True if the hub UI is fully open, meaning it should receive touch input.
      *
@@ -113,8 +124,14 @@
 
         communalContainerView = containerView
 
-        edgeSwipeRegionWidth =
-            communalContainerView.resources.getDimensionPixelSize(R.dimen.communal_grid_gutter_size)
+        rightEdgeSwipeRegionWidth =
+            communalContainerView.resources.getDimensionPixelSize(
+                R.dimen.communal_right_edge_swipe_region_width
+            )
+        topEdgeSwipeRegionWidth =
+            communalContainerView.resources.getDimensionPixelSize(
+                R.dimen.communal_top_edge_swipe_region_height
+            )
 
         collectFlow(
             communalContainerView,
@@ -157,17 +174,38 @@
         //  fully showing state
         val hubOccluded = anyBouncerShowing || shadeShowing
 
-        // If the hub is fully visible, send all touch events to it.
-        val communalVisible = hubShowing && !hubOccluded
-        if (communalVisible) {
+        // If the hub is fully visible, send all touch events to it, other than top and bottom edge
+        // swipes.
+        if (hubShowing && isDown) {
+            val y = ev.rawY
+            val topSwipe: Boolean = y <= topEdgeSwipeRegionWidth
+
+            // TODO(b/315207481): allow bottom edge swipes to open the bouncer
+            if (topSwipe) {
+                // Don't intercept touches at the top edge so that swipes can open the notification
+                // shade.
+                return false
+            }
+
+            if (!hubOccluded) {
+                isTrackingHubTouch = true
+                dispatchTouchEvent(ev)
+                // Return true regardless of dispatch result as some touches at the start of a
+                // gesture may return false from dispatchTouchEvent.
+                return true
+            }
+        } else if (isTrackingHubTouch) {
+            if (isUp || isCancel) {
+                isTrackingHubTouch = false
+            }
             dispatchTouchEvent(ev)
             // Return true regardless of dispatch result as some touches at the start of a gesture
             // may return false from dispatchTouchEvent.
             return true
         }
 
-        if (edgeSwipeRegionWidth == 0) {
-            // If the edge region width has not been read yet or whatever reason, don't bother
+        if (rightEdgeSwipeRegionWidth == 0) {
+            // If the edge region width has not been read yet for whatever reason, don't bother
             // intercepting touches to open the hub.
             return false
         }
@@ -175,7 +213,7 @@
         if (!isTrackingOpenGesture && isDown) {
             val x = ev.rawX
             val inOpeningSwipeRegion: Boolean =
-                x >= communalContainerView.width - edgeSwipeRegionWidth
+                x >= communalContainerView.width - rightEdgeSwipeRegionWidth
             if (inOpeningSwipeRegion && !hubOccluded) {
                 isTrackingOpenGesture = true
                 dispatchTouchEvent(ev)
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
index 9a8cc0a..1143481 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
@@ -355,6 +355,12 @@
     private float mMaxAlphaForExpansion = 1.0f;
     private float mMaxAlphaForUnhide = 1.0f;
 
+    /**
+     * Maximum alpha when to and from or sitting idle on the glanceable hub. Will be 1.0f when the
+     * hub is not visible or transitioning.
+     */
+    private float mMaxAlphaForGlanceableHub = 1.0f;
+
     private final NotificationListViewBinder mViewBinder;
 
     private void updateResources() {
@@ -1285,9 +1291,19 @@
         updateAlpha();
     }
 
+    /**
+     * Sets the max alpha value for notifications when idle on the glanceable hub or when
+     * transitioning to/from the glanceable hub.
+     */
+    public void setMaxAlphaForGlanceableHub(float alpha) {
+        mMaxAlphaForGlanceableHub = alpha;
+        updateAlpha();
+    }
+
     private void updateAlpha() {
         if (mView != null) {
-            mView.setAlpha(Math.min(mMaxAlphaForExpansion, mMaxAlphaForUnhide));
+            mView.setAlpha(Math.min(mMaxAlphaForExpansion,
+                    Math.min(mMaxAlphaForUnhide, mMaxAlphaForGlanceableHub)));
         }
     }
 
@@ -1779,6 +1795,7 @@
     public void dump(@NonNull PrintWriter pw, @NonNull String[] args) {
         pw.println("mMaxAlphaForExpansion=" + mMaxAlphaForExpansion);
         pw.println("mMaxAlphaForUnhide=" + mMaxAlphaForUnhide);
+        pw.println("mMaxAlphaForGlanceableHub=" + mMaxAlphaForGlanceableHub);
     }
 
     /**
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewbinder/SharedNotificationContainerBinder.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewbinder/SharedNotificationContainerBinder.kt
index 12927b8..f842e30 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewbinder/SharedNotificationContainerBinder.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewbinder/SharedNotificationContainerBinder.kt
@@ -18,7 +18,6 @@
 
 import android.animation.Animator
 import android.animation.AnimatorListenerAdapter
-import android.animation.ValueAnimator
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.repeatOnLifecycle
 import com.android.systemui.dagger.qualifiers.Main
@@ -125,7 +124,14 @@
 
                     launch { viewModel.translationY.collect { controller.setTranslationY(it) } }
 
-                    launch { viewModel.alpha.collect { controller.setMaxAlphaForExpansion(it) } }
+                    launch {
+                        viewModel.expansionAlpha.collect { controller.setMaxAlphaForExpansion(it) }
+                    }
+                    launch {
+                        viewModel.glanceableHubAlpha.collect {
+                            controller.setMaxAlphaForGlanceableHub(it)
+                        }
+                    }
                 }
             }
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModel.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModel.kt
index a48fb45..99cd89b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModel.kt
@@ -20,6 +20,7 @@
 package com.android.systemui.statusbar.notification.stack.ui.viewmodel
 
 import com.android.systemui.common.shared.model.NotificationContainerBounds
+import com.android.systemui.communal.domain.interactor.CommunalInteractor
 import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.keyguard.domain.interactor.KeyguardInteractor
 import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInteractor
@@ -27,6 +28,8 @@
 import com.android.systemui.keyguard.shared.model.StatusBarState.SHADE_LOCKED
 import com.android.systemui.keyguard.shared.model.TransitionState.RUNNING
 import com.android.systemui.keyguard.shared.model.TransitionState.STARTED
+import com.android.systemui.keyguard.ui.viewmodel.GlanceableHubToLockscreenTransitionViewModel
+import com.android.systemui.keyguard.ui.viewmodel.LockscreenToGlanceableHubTransitionViewModel
 import com.android.systemui.keyguard.ui.viewmodel.LockscreenToOccludedTransitionViewModel
 import com.android.systemui.keyguard.ui.viewmodel.OccludedToLockscreenTransitionViewModel
 import com.android.systemui.shade.domain.interactor.ShadeInteractor
@@ -61,8 +64,11 @@
     private val keyguardInteractor: KeyguardInteractor,
     keyguardTransitionInteractor: KeyguardTransitionInteractor,
     private val shadeInteractor: ShadeInteractor,
+    communalInteractor: CommunalInteractor,
     occludedToLockscreenTransitionViewModel: OccludedToLockscreenTransitionViewModel,
     lockscreenToOccludedTransitionViewModel: LockscreenToOccludedTransitionViewModel,
+    glanceableHubToLockscreenTransitionViewModel: GlanceableHubToLockscreenTransitionViewModel,
+    lockscreenToGlanceableHubTransitionViewModel: LockscreenToGlanceableHubTransitionViewModel
 ) {
     private val statesForConstrainedNotifications =
         setOf(
@@ -87,6 +93,20 @@
             .distinctUntilChanged()
             .onStart { emit(false) }
 
+    private val lockscreenToGlanceableHubRunning =
+        keyguardTransitionInteractor
+            .transition(KeyguardState.LOCKSCREEN, KeyguardState.GLANCEABLE_HUB)
+            .map { it.transitionState == STARTED || it.transitionState == RUNNING }
+            .distinctUntilChanged()
+            .onStart { emit(false) }
+
+    private val glanceableHubToLockscreenRunning =
+        keyguardTransitionInteractor
+            .transition(KeyguardState.GLANCEABLE_HUB, KeyguardState.LOCKSCREEN)
+            .map { it.transitionState == STARTED || it.transitionState == RUNNING }
+            .distinctUntilChanged()
+            .onStart { emit(false) }
+
     val shadeCollapseFadeInComplete = MutableStateFlow(false)
 
     val configurationBasedDimensions: Flow<ConfigurationBasedDimensions> =
@@ -144,6 +164,24 @@
                 initialValue = false,
             )
 
+    /** Are we purely on the glanceable hub without the shade/qs? */
+    internal val isOnGlanceableHubWithoutShade: Flow<Boolean> =
+        combine(
+                communalInteractor.isIdleOnCommunal,
+                // Shade with notifications
+                shadeInteractor.shadeExpansion.map { it > 0f },
+                // Shade without notifications, quick settings only (pull down from very top on
+                // lockscreen)
+                shadeInteractor.qsExpansion.map { it > 0f },
+            ) { isIdleOnCommunal, isShadeVisible, qsExpansion ->
+                isIdleOnCommunal && !(isShadeVisible || qsExpansion)
+            }
+            .stateIn(
+                scope = applicationScope,
+                started = SharingStarted.WhileSubscribed(),
+                initialValue = false,
+            )
+
     /** Fade in only for use after the shade collapses */
     val shadeCollpaseFadeIn: Flow<Boolean> =
         flow {
@@ -201,7 +239,7 @@
                 initialValue = NotificationContainerBounds(),
             )
 
-    val alpha: Flow<Float> =
+    val expansionAlpha: Flow<Float> =
         // Due to issues with the legacy shade, some shade expansion events are sent incorrectly,
         // such as when the shade resets. This can happen while the LOCKSCREEN<->OCCLUDED transition
         // is running. Therefore use a series of flatmaps to prevent unwanted interruptions while
@@ -235,6 +273,43 @@
         }
 
     /**
+     * Returns a flow of the expected alpha while running a LOCKSCREEN<->GLANCEABLE_HUB transition
+     * or idle on the glanceable hub.
+     *
+     * Must return 1.0f when not controlling the alpha since notifications does a min of all the
+     * alpha sources.
+     */
+    val glanceableHubAlpha: Flow<Float> =
+        isOnGlanceableHubWithoutShade.flatMapLatest { isOnGlanceableHubWithoutShade ->
+            combineTransform(
+                lockscreenToGlanceableHubRunning,
+                glanceableHubToLockscreenRunning,
+                merge(
+                        lockscreenToGlanceableHubTransitionViewModel.notificationAlpha,
+                        glanceableHubToLockscreenTransitionViewModel.notificationAlpha,
+                    )
+                    .onStart {
+                        // Transition flows don't emit a value on start, kick things off so the
+                        // combine starts.
+                        emit(1f)
+                    }
+            ) { lockscreenToGlanceableHubRunning, glanceableHubToLockscreenRunning, alpha ->
+                if (isOnGlanceableHubWithoutShade) {
+                    // Notifications should not be visible on the glanceable hub.
+                    // TODO(b/321075734): implement a way to actually set the notifications to gone
+                    //  while on the hub instead of just adjusting alpha
+                    emit(0f)
+                } else if (lockscreenToGlanceableHubRunning || glanceableHubToLockscreenRunning) {
+                    emit(alpha)
+                } else {
+                    // Not on the hub and no transitions running, return full visibility so we don't
+                    // block the notifications from showing.
+                    emit(1f)
+                }
+            }
+        }
+
+    /**
      * Under certain scenarios, such as swiping up on the lockscreen, the container will need to be
      * translated as the keyguard fades out.
      */
diff --git a/packages/SystemUI/tests/src/com/android/systemui/shade/GlanceableHubContainerControllerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/shade/GlanceableHubContainerControllerTest.kt
index 81ff817..c1f5d85 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/shade/GlanceableHubContainerControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/shade/GlanceableHubContainerControllerTest.kt
@@ -94,7 +94,8 @@
             .thenReturn(bouncerShowingFlow)
         whenever(shadeInteractor.isAnyFullyExpanded).thenReturn(shadeShowingFlow)
 
-        overrideResource(R.dimen.communal_grid_gutter_size, SWIPE_REGION_WIDTH)
+        overrideResource(R.dimen.communal_right_edge_swipe_region_width, RIGHT_SWIPE_REGION_WIDTH)
+        overrideResource(R.dimen.communal_top_edge_swipe_region_height, TOP_SWIPE_REGION_WIDTH)
     }
 
     @Test
@@ -135,7 +136,7 @@
         initAndAttachContainerView()
 
         // Touch events are intercepted.
-        assertThat(underTest.onTouchEvent(DOWN_IN_SWIPE_REGION_EVENT)).isTrue()
+        assertThat(underTest.onTouchEvent(DOWN_IN_RIGHT_SWIPE_REGION_EVENT)).isTrue()
     }
 
     @Test
@@ -147,7 +148,7 @@
 
         // Initial touch down is intercepted, and so are touches outside of the region, until an up
         // event is received.
-        assertThat(underTest.onTouchEvent(DOWN_IN_SWIPE_REGION_EVENT)).isTrue()
+        assertThat(underTest.onTouchEvent(DOWN_IN_RIGHT_SWIPE_REGION_EVENT)).isTrue()
         assertThat(underTest.onTouchEvent(MOVE_EVENT)).isTrue()
         assertThat(underTest.onTouchEvent(UP_EVENT)).isTrue()
         assertThat(underTest.onTouchEvent(MOVE_EVENT)).isFalse()
@@ -168,6 +169,17 @@
     }
 
     @Test
+    fun onTouchEvent_topSwipeWhenHubOpen_returnsFalse() {
+        // Communal is open.
+        communalRepository.setDesiredScene(CommunalSceneKey.Communal)
+
+        initAndAttachContainerView()
+
+        // Touch event in the top swipe reqgion is not intercepted.
+        assertThat(underTest.onTouchEvent(DOWN_IN_TOP_SWIPE_REGION_EVENT)).isFalse()
+    }
+
+    @Test
     fun onTouchEvent_communalAndBouncerShowing_doesNotIntercept() {
         // Communal is open.
         communalRepository.setDesiredScene(CommunalSceneKey.Communal)
@@ -213,11 +225,29 @@
     companion object {
         private const val CONTAINER_WIDTH = 100
         private const val CONTAINER_HEIGHT = 100
-        private const val SWIPE_REGION_WIDTH = 20
+        private const val RIGHT_SWIPE_REGION_WIDTH = 20
+        private const val TOP_SWIPE_REGION_WIDTH = 20
 
-        private val DOWN_EVENT = MotionEvent.obtain(0L, 0L, MotionEvent.ACTION_DOWN, 0f, 0f, 0)
-        private val DOWN_IN_SWIPE_REGION_EVENT =
+        private val DOWN_EVENT =
+            MotionEvent.obtain(
+                0L,
+                0L,
+                MotionEvent.ACTION_DOWN,
+                CONTAINER_WIDTH.toFloat(),
+                CONTAINER_HEIGHT.toFloat(),
+                0
+            )
+        private val DOWN_IN_RIGHT_SWIPE_REGION_EVENT =
             MotionEvent.obtain(0L, 0L, MotionEvent.ACTION_DOWN, CONTAINER_WIDTH.toFloat(), 0f, 0)
+        private val DOWN_IN_TOP_SWIPE_REGION_EVENT =
+            MotionEvent.obtain(
+                0L,
+                0L,
+                MotionEvent.ACTION_DOWN,
+                0f,
+                TOP_SWIPE_REGION_WIDTH.toFloat(),
+                0
+            )
         private val MOVE_EVENT = MotionEvent.obtain(0L, 0L, MotionEvent.ACTION_MOVE, 0f, 0f, 0)
         private val UP_EVENT = MotionEvent.obtain(0L, 0L, MotionEvent.ACTION_UP, 0f, 0f, 0)
 
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModelTest.kt b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModelTest.kt
index a824bc4..06298b7 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModelTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModelTest.kt
@@ -25,6 +25,9 @@
 import com.android.systemui.SysuiTestCase
 import com.android.systemui.common.shared.model.NotificationContainerBounds
 import com.android.systemui.common.ui.data.repository.fakeConfigurationRepository
+import com.android.systemui.communal.domain.interactor.communalInteractor
+import com.android.systemui.communal.shared.model.CommunalSceneKey
+import com.android.systemui.communal.shared.model.ObservableCommunalTransitionState
 import com.android.systemui.coroutines.collectLastValue
 import com.android.systemui.flags.Flags
 import com.android.systemui.flags.fakeFeatureFlagsClassic
@@ -33,20 +36,19 @@
 import com.android.systemui.keyguard.domain.interactor.keyguardInteractor
 import com.android.systemui.keyguard.shared.model.KeyguardState
 import com.android.systemui.keyguard.shared.model.StatusBarState
-import com.android.systemui.keyguard.shared.model.StatusBarState.SHADE_LOCKED
 import com.android.systemui.keyguard.shared.model.TransitionState
 import com.android.systemui.keyguard.shared.model.TransitionStep
 import com.android.systemui.keyguard.ui.viewmodel.keyguardRootViewModel
 import com.android.systemui.kosmos.testScope
 import com.android.systemui.res.R
 import com.android.systemui.shade.data.repository.shadeRepository
-import com.android.systemui.shade.largeScreenHeaderHelper
 import com.android.systemui.shade.mockLargeScreenHeaderHelper
 import com.android.systemui.statusbar.notification.stack.domain.interactor.sharedNotificationContainerInteractor
 import com.android.systemui.testKosmos
 import com.android.systemui.util.mockito.whenever
 import com.google.common.truth.Truth.assertThat
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.test.TestScope
 import kotlinx.coroutines.test.runCurrent
 import kotlinx.coroutines.test.runTest
@@ -68,6 +70,7 @@
     val keyguardInteractor = kosmos.keyguardInteractor
     val keyguardRootViewModel = kosmos.keyguardRootViewModel
     val keyguardTransitionRepository = kosmos.fakeKeyguardTransitionRepository
+    val communalInteractor = kosmos.communalInteractor
     val shadeRepository = kosmos.shadeRepository
     val sharedNotificationContainerInteractor = kosmos.sharedNotificationContainerInteractor
     val largeScreenHeaderHelper = kosmos.mockLargeScreenHeaderHelper
@@ -214,6 +217,61 @@
         }
 
     @Test
+    fun glanceableHubAlpha() =
+        testScope.runTest {
+            val alpha by collectLastValue(underTest.glanceableHubAlpha)
+
+            // Start on lockscreen
+            showLockscreen()
+            assertThat(alpha).isEqualTo(1f)
+
+            // Start transitioning to glanceable hub
+            val progress = 0.6f
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    transitionState = TransitionState.STARTED,
+                    from = KeyguardState.LOCKSCREEN,
+                    to = KeyguardState.GLANCEABLE_HUB,
+                    value = 0f,
+                )
+            )
+            runCurrent()
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    transitionState = TransitionState.RUNNING,
+                    from = KeyguardState.LOCKSCREEN,
+                    to = KeyguardState.GLANCEABLE_HUB,
+                    value = progress,
+                )
+            )
+            runCurrent()
+            // Expected alpha is inverse of progress as notifications are fading away
+            assertThat(alpha).isEqualTo(1 - progress)
+
+            // Finish transition to glanceable hub
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    transitionState = TransitionState.FINISHED,
+                    from = KeyguardState.LOCKSCREEN,
+                    to = KeyguardState.GLANCEABLE_HUB,
+                    value = 1f,
+                )
+            )
+            val idleTransitionState =
+                MutableStateFlow<ObservableCommunalTransitionState>(
+                    ObservableCommunalTransitionState.Idle(CommunalSceneKey.Communal)
+                )
+            communalInteractor.setTransitionState(idleTransitionState)
+            runCurrent()
+            assertThat(alpha).isEqualTo(0f)
+
+            // While state is GLANCEABLE_HUB, verify alpha is restored to full if glanceable hub is
+            // not fully visible.
+            shadeRepository.setLockscreenShadeExpansion(0.1f)
+            assertThat(alpha).isEqualTo(1f)
+        }
+
+    @Test
     fun validateMarginTop() =
         testScope.runTest {
             overrideResource(R.bool.config_use_large_screen_shade_header, false)
@@ -302,6 +360,43 @@
         }
 
     @Test
+    fun isOnGlanceableHubWithoutShade() =
+        testScope.runTest {
+            val isOnGlanceableHubWithoutShade by
+                collectLastValue(underTest.isOnGlanceableHubWithoutShade)
+
+            // Start on lockscreen
+            showLockscreen()
+            assertThat(isOnGlanceableHubWithoutShade).isFalse()
+
+            // Move to glanceable hub
+            val idleTransitionState =
+                MutableStateFlow<ObservableCommunalTransitionState>(
+                    ObservableCommunalTransitionState.Idle(CommunalSceneKey.Communal)
+                )
+            communalInteractor.setTransitionState(idleTransitionState)
+            runCurrent()
+            assertThat(isOnGlanceableHubWithoutShade).isTrue()
+
+            // While state is GLANCEABLE_HUB, validate variations of both shade and qs expansion
+            shadeRepository.setLockscreenShadeExpansion(0.1f)
+            shadeRepository.setQsExpansion(0f)
+            assertThat(isOnGlanceableHubWithoutShade).isFalse()
+
+            shadeRepository.setLockscreenShadeExpansion(0.1f)
+            shadeRepository.setQsExpansion(0.1f)
+            assertThat(isOnGlanceableHubWithoutShade).isFalse()
+
+            shadeRepository.setLockscreenShadeExpansion(0f)
+            shadeRepository.setQsExpansion(0.1f)
+            assertThat(isOnGlanceableHubWithoutShade).isFalse()
+
+            shadeRepository.setLockscreenShadeExpansion(0f)
+            shadeRepository.setQsExpansion(0f)
+            assertThat(isOnGlanceableHubWithoutShade).isTrue()
+        }
+
+    @Test
     fun boundsOnLockscreenNotInSplitShade() =
         testScope.runTest {
             val bounds by collectLastValue(underTest.bounds)
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModelKosmos.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModelKosmos.kt
index 5564767..d376f12 100644
--- a/packages/SystemUI/tests/utils/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModelKosmos.kt
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardRootViewModelKosmos.kt
@@ -18,6 +18,7 @@
 
 package com.android.systemui.keyguard.ui.viewmodel
 
+import com.android.systemui.communal.domain.interactor.communalInteractor
 import com.android.systemui.deviceentry.domain.interactor.deviceEntryInteractor
 import com.android.systemui.keyguard.domain.interactor.keyguardInteractor
 import com.android.systemui.keyguard.domain.interactor.keyguardTransitionInteractor
@@ -33,6 +34,7 @@
         deviceEntryInteractor = deviceEntryInteractor,
         dozeParameters = dozeParameters,
         keyguardInteractor = keyguardInteractor,
+        communalInteractor = communalInteractor,
         keyguardTransitionInteractor = keyguardTransitionInteractor,
         notificationsKeyguardInteractor = notificationsKeyguardInteractor,
         aodToLockscreenTransitionViewModel = aodToLockscreenTransitionViewModel,
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModelKosmos.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModelKosmos.kt
index 5ef9a8e..db40509 100644
--- a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModelKosmos.kt
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModelKosmos.kt
@@ -16,8 +16,11 @@
 
 package com.android.systemui.statusbar.notification.stack.ui.viewmodel
 
+import com.android.systemui.communal.domain.interactor.communalInteractor
 import com.android.systemui.keyguard.domain.interactor.keyguardInteractor
 import com.android.systemui.keyguard.domain.interactor.keyguardTransitionInteractor
+import com.android.systemui.keyguard.ui.viewmodel.glanceableHubToLockscreenTransitionViewModel
+import com.android.systemui.keyguard.ui.viewmodel.lockscreenToGlanceableHubTransitionViewModel
 import com.android.systemui.keyguard.ui.viewmodel.lockscreenToOccludedTransitionViewModel
 import com.android.systemui.keyguard.ui.viewmodel.occludedToLockscreenTransitionViewModel
 import com.android.systemui.kosmos.Kosmos
@@ -33,7 +36,10 @@
         keyguardInteractor = keyguardInteractor,
         keyguardTransitionInteractor = keyguardTransitionInteractor,
         shadeInteractor = shadeInteractor,
+        communalInteractor = communalInteractor,
         occludedToLockscreenTransitionViewModel = occludedToLockscreenTransitionViewModel,
         lockscreenToOccludedTransitionViewModel = lockscreenToOccludedTransitionViewModel,
+        glanceableHubToLockscreenTransitionViewModel = glanceableHubToLockscreenTransitionViewModel,
+        lockscreenToGlanceableHubTransitionViewModel = lockscreenToGlanceableHubTransitionViewModel
     )
 }