Transitions: Gone->Dreaming

Explicitly support gone to dreaming. At the moment, the lockscreen
briefly shows when the power button is pushed. This will move lockscreen
elements out of the way.

Bug: 260637747
Test: atest GoneToDreamingTransitionViewModelTest
NotificationPanelViewControllerTest KeyguardScenariosTest

Change-Id: I0e3adb6799a8144eaf810b9ee20e54b29d7d505b
diff --git a/packages/SystemUI/res/values/dimens.xml b/packages/SystemUI/res/values/dimens.xml
index 6cb012a..678706f 100644
--- a/packages/SystemUI/res/values/dimens.xml
+++ b/packages/SystemUI/res/values/dimens.xml
@@ -1282,6 +1282,9 @@
     <!-- LOCKSCREEN -> DREAMING transition: Amount to shift lockscreen content on entering -->
     <dimen name="lockscreen_to_dreaming_transition_lockscreen_translation_y">-40dp</dimen>
 
+    <!-- GONE -> DREAMING transition: Amount to shift lockscreen content on entering -->
+    <dimen name="gone_to_dreaming_transition_lockscreen_translation_y">-40dp</dimen>
+
     <!-- LOCKSCREEN -> OCCLUDED transition: Amount to shift lockscreen content on entering -->
     <dimen name="lockscreen_to_occluded_transition_lockscreen_translation_y">-40dp</dimen>
 
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/KeyguardTransitionInteractor.kt b/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/KeyguardTransitionInteractor.kt
index 9cdbcda..207eb04 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/KeyguardTransitionInteractor.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/KeyguardTransitionInteractor.kt
@@ -23,6 +23,7 @@
 import com.android.systemui.keyguard.shared.model.KeyguardState
 import com.android.systemui.keyguard.shared.model.KeyguardState.AOD
 import com.android.systemui.keyguard.shared.model.KeyguardState.DREAMING
+import com.android.systemui.keyguard.shared.model.KeyguardState.GONE
 import com.android.systemui.keyguard.shared.model.KeyguardState.LOCKSCREEN
 import com.android.systemui.keyguard.shared.model.KeyguardState.OCCLUDED
 import com.android.systemui.keyguard.shared.model.TransitionState
@@ -30,6 +31,8 @@
 import com.android.systemui.keyguard.shared.model.TransitionStep
 import javax.inject.Inject
 import kotlin.time.Duration
+import kotlin.math.max
+import kotlin.math.min
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.map
@@ -53,6 +56,9 @@
     val dreamingToLockscreenTransition: Flow<TransitionStep> =
         repository.transition(DREAMING, LOCKSCREEN)
 
+    /** GONE->DREAMING transition information. */
+    val goneToDreamingTransition: Flow<TransitionStep> = repository.transition(GONE, DREAMING)
+
     /** LOCKSCREEN->AOD transition information. */
     val lockscreenToAodTransition: Flow<TransitionStep> = repository.transition(LOCKSCREEN, AOD)
 
@@ -106,13 +112,23 @@
     ): Flow<Float> {
         val start = (params.startTime / totalDuration).toFloat()
         val chunks = (totalDuration / params.duration).toFloat()
+        var isRunning = false
         return flow
-            // When starting, emit a value of 0f to give animations a chance to set initial state
             .map { step ->
+                val value = (step.value - start) * chunks
                 if (step.transitionState == STARTED) {
-                    0f
+                    // When starting, make sure to always emit. If a transition is started from the
+                    // middle, it is possible this animation is being skipped but we need to inform
+                    // the ViewModels of the last update
+                    isRunning = true
+                    max(0f, min(1f, value))
+                } else if (isRunning && value >= 1f) {
+                    // Always send a final value of 1. Because of rounding, [value] may never be
+                    // exactly 1.
+                    isRunning = false
+                    1f
                 } else {
-                    (step.value - start) * chunks
+                    value
                 }
             }
             .filter { value -> value >= 0f && value <= 1f }
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/GoneToDreamingTransitionViewModel.kt b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/GoneToDreamingTransitionViewModel.kt
new file mode 100644
index 0000000..45e8f47
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/GoneToDreamingTransitionViewModel.kt
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.keyguard.ui.viewmodel
+
+import com.android.systemui.animation.Interpolators.EMPHASIZED_ACCELERATE
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.keyguard.domain.interactor.FromGoneTransitionInteractor.Companion.TO_DREAMING_DURATION
+import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInteractor
+import com.android.systemui.keyguard.shared.model.AnimationParams
+import com.android.systemui.keyguard.shared.model.TransitionState
+import javax.inject.Inject
+import kotlin.time.Duration.Companion.milliseconds
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.merge
+
+/** Breaks down GONE->DREAMING transition into discrete steps for corresponding views to consume. */
+@SysUISingleton
+class GoneToDreamingTransitionViewModel
+@Inject
+constructor(
+    private val interactor: KeyguardTransitionInteractor,
+) {
+
+    /** Lockscreen views y-translation */
+    fun lockscreenTranslationY(translatePx: Int): Flow<Float> {
+        return merge(
+            flowForAnimation(LOCKSCREEN_TRANSLATION_Y).map { value ->
+                (EMPHASIZED_ACCELERATE.getInterpolation(value) * translatePx)
+            },
+            // On end, reset the translation to 0
+            interactor.goneToDreamingTransition
+                .filter { step -> step.transitionState == TransitionState.FINISHED }
+                .map { 0f }
+        )
+    }
+
+    /** Lockscreen views alpha */
+    val lockscreenAlpha: Flow<Float> = flowForAnimation(LOCKSCREEN_ALPHA).map { 1f - it }
+
+    private fun flowForAnimation(params: AnimationParams): Flow<Float> {
+        return interactor.transitionStepAnimation(
+            interactor.goneToDreamingTransition,
+            params,
+            totalDuration = TO_DREAMING_DURATION
+        )
+    }
+
+    companion object {
+        val LOCKSCREEN_TRANSLATION_Y = AnimationParams(duration = 500.milliseconds)
+        val LOCKSCREEN_ALPHA = AnimationParams(duration = 250.milliseconds)
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java b/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
index 80d7bbc..2f17fc5 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
+++ b/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
@@ -144,6 +144,7 @@
 import com.android.systemui.keyguard.shared.model.TransitionState;
 import com.android.systemui.keyguard.shared.model.TransitionStep;
 import com.android.systemui.keyguard.ui.viewmodel.DreamingToLockscreenTransitionViewModel;
+import com.android.systemui.keyguard.ui.viewmodel.GoneToDreamingTransitionViewModel;
 import com.android.systemui.keyguard.ui.viewmodel.KeyguardBottomAreaViewModel;
 import com.android.systemui.keyguard.ui.viewmodel.LockscreenToDreamingTransitionViewModel;
 import com.android.systemui.keyguard.ui.viewmodel.LockscreenToOccludedTransitionViewModel;
@@ -692,6 +693,7 @@
     private DreamingToLockscreenTransitionViewModel mDreamingToLockscreenTransitionViewModel;
     private OccludedToLockscreenTransitionViewModel mOccludedToLockscreenTransitionViewModel;
     private LockscreenToDreamingTransitionViewModel mLockscreenToDreamingTransitionViewModel;
+    private GoneToDreamingTransitionViewModel mGoneToDreamingTransitionViewModel;
     private LockscreenToOccludedTransitionViewModel mLockscreenToOccludedTransitionViewModel;
 
     private KeyguardTransitionInteractor mKeyguardTransitionInteractor;
@@ -700,6 +702,7 @@
     private int mDreamingToLockscreenTransitionTranslationY;
     private int mOccludedToLockscreenTransitionTranslationY;
     private int mLockscreenToDreamingTransitionTranslationY;
+    private int mGoneToDreamingTransitionTranslationY;
     private int mLockscreenToOccludedTransitionTranslationY;
     private boolean mUnocclusionTransitionFlagEnabled = false;
 
@@ -735,6 +738,12 @@
                     step.getTransitionState() == TransitionState.RUNNING;
             };
 
+    private final Consumer<TransitionStep> mGoneToDreamingTransition =
+            (TransitionStep step) -> {
+                mIsOcclusionTransitionRunning =
+                    step.getTransitionState() == TransitionState.RUNNING;
+            };
+
     private final Consumer<TransitionStep> mLockscreenToOccludedTransition =
             (TransitionStep step) -> {
                 mIsOcclusionTransitionRunning =
@@ -813,6 +822,7 @@
             DreamingToLockscreenTransitionViewModel dreamingToLockscreenTransitionViewModel,
             OccludedToLockscreenTransitionViewModel occludedToLockscreenTransitionViewModel,
             LockscreenToDreamingTransitionViewModel lockscreenToDreamingTransitionViewModel,
+            GoneToDreamingTransitionViewModel goneToDreamingTransitionViewModel,
             LockscreenToOccludedTransitionViewModel lockscreenToOccludedTransitionViewModel,
             @Main CoroutineDispatcher mainDispatcher,
             KeyguardTransitionInteractor keyguardTransitionInteractor,
@@ -834,6 +844,7 @@
         mDreamingToLockscreenTransitionViewModel = dreamingToLockscreenTransitionViewModel;
         mOccludedToLockscreenTransitionViewModel = occludedToLockscreenTransitionViewModel;
         mLockscreenToDreamingTransitionViewModel = lockscreenToDreamingTransitionViewModel;
+        mGoneToDreamingTransitionViewModel = goneToDreamingTransitionViewModel;
         mLockscreenToOccludedTransitionViewModel = lockscreenToOccludedTransitionViewModel;
         mKeyguardTransitionInteractor = keyguardTransitionInteractor;
         mView.addOnAttachStateChangeListener(new View.OnAttachStateChangeListener() {
@@ -1172,6 +1183,17 @@
                     setTransitionY(mNotificationStackScrollLayoutController),
                     mMainDispatcher);
 
+            // Gone->Dreaming
+            collectFlow(mView, mKeyguardTransitionInteractor.getGoneToDreamingTransition(),
+                    mGoneToDreamingTransition, mMainDispatcher);
+            collectFlow(mView, mGoneToDreamingTransitionViewModel.getLockscreenAlpha(),
+                    setTransitionAlpha(mNotificationStackScrollLayoutController),
+                    mMainDispatcher);
+            collectFlow(mView, mGoneToDreamingTransitionViewModel.lockscreenTranslationY(
+                    mGoneToDreamingTransitionTranslationY),
+                    setTransitionY(mNotificationStackScrollLayoutController),
+                    mMainDispatcher);
+
             // Lockscreen->Occluded
             collectFlow(mView, mKeyguardTransitionInteractor.getLockscreenToOccludedTransition(),
                     mLockscreenToOccludedTransition, mMainDispatcher);
@@ -1223,6 +1245,8 @@
                 R.dimen.occluded_to_lockscreen_transition_lockscreen_translation_y);
         mLockscreenToDreamingTransitionTranslationY = mResources.getDimensionPixelSize(
                 R.dimen.lockscreen_to_dreaming_transition_lockscreen_translation_y);
+        mGoneToDreamingTransitionTranslationY = mResources.getDimensionPixelSize(
+                R.dimen.gone_to_dreaming_transition_lockscreen_translation_y);
         mLockscreenToOccludedTransitionTranslationY = mResources.getDimensionPixelSize(
                 R.dimen.lockscreen_to_occluded_transition_lockscreen_translation_y);
     }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/keyguard/domain/interactor/KeyguardTransitionScenariosTest.kt b/packages/SystemUI/tests/src/com/android/systemui/keyguard/domain/interactor/KeyguardTransitionScenariosTest.kt
index b3cee22..e12c363 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/keyguard/domain/interactor/KeyguardTransitionScenariosTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/keyguard/domain/interactor/KeyguardTransitionScenariosTest.kt
@@ -506,7 +506,7 @@
                 withArgCaptor<TransitionInfo> {
                     verify(mockTransitionRepository).startTransition(capture())
                 }
-            // THEN a transition to DOZING should occur
+            // THEN a transition to AOD should occur
             assertThat(info.ownerName).isEqualTo("FromGoneTransitionInteractor")
             assertThat(info.from).isEqualTo(KeyguardState.GONE)
             assertThat(info.to).isEqualTo(KeyguardState.AOD)
@@ -515,6 +515,50 @@
             coroutineContext.cancelChildren()
         }
 
+    @Test
+    fun `GONE to DREAMING`() =
+        testScope.runTest {
+            // GIVEN a device that is not dreaming or dozing
+            keyguardRepository.setDreamingWithOverlay(false)
+            keyguardRepository.setDozeTransitionModel(
+                DozeTransitionModel(from = DozeStateModel.DOZE, to = DozeStateModel.FINISH)
+            )
+            runCurrent()
+
+            // GIVEN a prior transition has run to GONE
+            runner.startTransition(
+                testScope,
+                TransitionInfo(
+                    ownerName = "",
+                    from = KeyguardState.LOCKSCREEN,
+                    to = KeyguardState.GONE,
+                    animator =
+                        ValueAnimator().apply {
+                            duration = 10
+                            interpolator = Interpolators.LINEAR
+                        },
+                )
+            )
+            runCurrent()
+            reset(mockTransitionRepository)
+
+            // WHEN the device begins to dream
+            keyguardRepository.setDreamingWithOverlay(true)
+            runCurrent()
+
+            val info =
+                withArgCaptor<TransitionInfo> {
+                    verify(mockTransitionRepository).startTransition(capture())
+                }
+            // THEN a transition to DREAMING should occur
+            assertThat(info.ownerName).isEqualTo("FromGoneTransitionInteractor")
+            assertThat(info.from).isEqualTo(KeyguardState.GONE)
+            assertThat(info.to).isEqualTo(KeyguardState.DREAMING)
+            assertThat(info.animator).isNotNull()
+
+            coroutineContext.cancelChildren()
+        }
+
     private fun startingToWake() =
         WakefulnessModel(
             WakefulnessState.STARTING_TO_WAKE,
diff --git a/packages/SystemUI/tests/src/com/android/systemui/keyguard/ui/viewmodel/GoneToDreamingTransitionViewModelTest.kt b/packages/SystemUI/tests/src/com/android/systemui/keyguard/ui/viewmodel/GoneToDreamingTransitionViewModelTest.kt
new file mode 100644
index 0000000..69b6c63
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/keyguard/ui/viewmodel/GoneToDreamingTransitionViewModelTest.kt
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.keyguard.ui.viewmodel
+
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.animation.Interpolators.EMPHASIZED_ACCELERATE
+import com.android.systemui.keyguard.data.repository.FakeKeyguardTransitionRepository
+import com.android.systemui.keyguard.domain.interactor.FromGoneTransitionInteractor.Companion.TO_DREAMING_DURATION
+import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInteractor
+import com.android.systemui.keyguard.shared.model.AnimationParams
+import com.android.systemui.keyguard.shared.model.KeyguardState
+import com.android.systemui.keyguard.shared.model.TransitionState
+import com.android.systemui.keyguard.shared.model.TransitionStep
+import com.android.systemui.keyguard.ui.viewmodel.GoneToDreamingTransitionViewModel.Companion.LOCKSCREEN_ALPHA
+import com.android.systemui.keyguard.ui.viewmodel.GoneToDreamingTransitionViewModel.Companion.LOCKSCREEN_TRANSLATION_Y
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.runTest
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@SmallTest
+@RunWith(JUnit4::class)
+class GoneToDreamingTransitionViewModelTest : SysuiTestCase() {
+    private lateinit var underTest: GoneToDreamingTransitionViewModel
+    private lateinit var repository: FakeKeyguardTransitionRepository
+
+    @Before
+    fun setUp() {
+        repository = FakeKeyguardTransitionRepository()
+        val interactor = KeyguardTransitionInteractor(repository)
+        underTest = GoneToDreamingTransitionViewModel(interactor)
+    }
+
+    @Test
+    fun lockscreenFadeOut() =
+        runTest(UnconfinedTestDispatcher()) {
+            val values = mutableListOf<Float>()
+
+            val job = underTest.lockscreenAlpha.onEach { values.add(it) }.launchIn(this)
+
+            // Should start running here...
+            repository.sendTransitionStep(step(0f))
+            repository.sendTransitionStep(step(0.1f))
+            repository.sendTransitionStep(step(0.2f))
+            // ...up to here
+            repository.sendTransitionStep(step(0.3f))
+            repository.sendTransitionStep(step(1f))
+
+            // Only three values should be present, since the dream overlay runs for a small
+            // fraction
+            // of the overall animation time
+            assertThat(values.size).isEqualTo(3)
+            assertThat(values[0]).isEqualTo(1f - animValue(0f, LOCKSCREEN_ALPHA))
+            assertThat(values[1]).isEqualTo(1f - animValue(0.1f, LOCKSCREEN_ALPHA))
+            assertThat(values[2]).isEqualTo(1f - animValue(0.2f, LOCKSCREEN_ALPHA))
+
+            job.cancel()
+        }
+
+    @Test
+    fun lockscreenTranslationY() =
+        runTest(UnconfinedTestDispatcher()) {
+            val values = mutableListOf<Float>()
+
+            val pixels = 100
+            val job =
+                underTest.lockscreenTranslationY(pixels).onEach { values.add(it) }.launchIn(this)
+
+            // Should start running here...
+            repository.sendTransitionStep(step(0f))
+            repository.sendTransitionStep(step(0.3f))
+            repository.sendTransitionStep(step(0.5f))
+            // ...up to here
+            repository.sendTransitionStep(step(1f))
+
+            assertThat(values.size).isEqualTo(3)
+            assertThat(values[0])
+                .isEqualTo(
+                    EMPHASIZED_ACCELERATE.getInterpolation(
+                        animValue(0f, LOCKSCREEN_TRANSLATION_Y)
+                    ) * pixels
+                )
+            assertThat(values[1])
+                .isEqualTo(
+                    EMPHASIZED_ACCELERATE.getInterpolation(
+                        animValue(0.3f, LOCKSCREEN_TRANSLATION_Y)
+                    ) * pixels
+                )
+            assertThat(values[2])
+                .isEqualTo(
+                    EMPHASIZED_ACCELERATE.getInterpolation(
+                        animValue(0.5f, LOCKSCREEN_TRANSLATION_Y)
+                    ) * pixels
+                )
+            job.cancel()
+        }
+
+    private fun animValue(stepValue: Float, params: AnimationParams): Float {
+        val totalDuration = TO_DREAMING_DURATION
+        val startValue = (params.startTime / totalDuration).toFloat()
+
+        val multiplier = (totalDuration / params.duration).toFloat()
+        return (stepValue - startValue) * multiplier
+    }
+
+    private fun step(value: Float): TransitionStep {
+        return TransitionStep(
+            from = KeyguardState.GONE,
+            to = KeyguardState.DREAMING,
+            value = value,
+            transitionState = TransitionState.RUNNING,
+            ownerName = "GoneToDreamingTransitionViewModelTest"
+        )
+    }
+}
diff --git a/packages/SystemUI/tests/src/com/android/systemui/shade/NotificationPanelViewControllerTest.java b/packages/SystemUI/tests/src/com/android/systemui/shade/NotificationPanelViewControllerTest.java
index d0b42ae..0f3d4a8 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/shade/NotificationPanelViewControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/shade/NotificationPanelViewControllerTest.java
@@ -107,6 +107,7 @@
 import com.android.systemui.keyguard.domain.interactor.KeyguardBottomAreaInteractor;
 import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInteractor;
 import com.android.systemui.keyguard.ui.viewmodel.DreamingToLockscreenTransitionViewModel;
+import com.android.systemui.keyguard.ui.viewmodel.GoneToDreamingTransitionViewModel;
 import com.android.systemui.keyguard.ui.viewmodel.KeyguardBottomAreaViewModel;
 import com.android.systemui.keyguard.ui.viewmodel.LockscreenToDreamingTransitionViewModel;
 import com.android.systemui.keyguard.ui.viewmodel.LockscreenToOccludedTransitionViewModel;
@@ -298,6 +299,7 @@
     @Mock private OccludedToLockscreenTransitionViewModel mOccludedToLockscreenTransitionViewModel;
     @Mock private LockscreenToDreamingTransitionViewModel mLockscreenToDreamingTransitionViewModel;
     @Mock private LockscreenToOccludedTransitionViewModel mLockscreenToOccludedTransitionViewModel;
+    @Mock private GoneToDreamingTransitionViewModel mGoneToDreamingTransitionViewModel;
 
     @Mock private KeyguardTransitionInteractor mKeyguardTransitionInteractor;
     @Mock private CoroutineDispatcher mMainDispatcher;
@@ -522,6 +524,7 @@
                 mDreamingToLockscreenTransitionViewModel,
                 mOccludedToLockscreenTransitionViewModel,
                 mLockscreenToDreamingTransitionViewModel,
+                mGoneToDreamingTransitionViewModel,
                 mLockscreenToOccludedTransitionViewModel,
                 mMainDispatcher,
                 mKeyguardTransitionInteractor,