1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.systemui.keyguard.ui.viewmodel 18 19 import android.util.MathUtils 20 import com.android.systemui.dagger.SysUISingleton 21 import com.android.systemui.keyguard.domain.interactor.FromAodTransitionInteractor 22 import com.android.systemui.keyguard.shared.model.Edge 23 import com.android.systemui.keyguard.shared.model.KeyguardState.DOZING 24 import com.android.systemui.keyguard.shared.model.KeyguardState.OCCLUDED 25 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow 26 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition 27 import com.android.systemui.shared.Flags.ambientAod 28 import javax.inject.Inject 29 import kotlin.time.Duration.Companion.milliseconds 30 import kotlinx.coroutines.flow.Flow 31 32 /** 33 * Breaks down DOZING->OCCLUDED transition into discrete steps for corresponding views to consume. 34 */ 35 @SysUISingleton 36 class DozingToOccludedTransitionViewModel 37 @Inject 38 constructor(animationFlow: KeyguardTransitionAnimationFlow) : DeviceEntryIconTransition { 39 private val transitionAnimation = 40 animationFlow.setup( 41 duration = FromAodTransitionInteractor.TO_OCCLUDED_DURATION, 42 edge = Edge.create(from = DOZING, to = OCCLUDED), 43 ) 44 45 /** 46 * Fade out the lockscreen during a transition to OCCLUDED. 47 * 48 * This happens when pressing the power button while a SHOW_WHEN_LOCKED activity is on the top 49 * of the task stack, as well as when the power button is double tapped on the LOCKSCREEN (the 50 * first tap transitions to DOZING, the second cancels that transition and starts DOZING -> 51 * OCCLUDED. 52 */ lockscreenAlphanull53 fun lockscreenAlpha(viewState: ViewStateAccessor): Flow<Float> { 54 var currentAlpha = 0f 55 return transitionAnimation.sharedFlow( 56 duration = 250.milliseconds, 57 startTime = 0.milliseconds, 58 onStart = { 59 if (ambientAod()) { 60 currentAlpha = viewState.alpha() 61 } else { 62 currentAlpha = 0f 63 } 64 }, 65 onStep = { MathUtils.lerp(currentAlpha, 0f, it) }, 66 ) 67 } 68 69 override val deviceEntryParentViewAlpha = transitionAnimation.immediatelyTransitionTo(0f) 70 } 71