1 /* 2 * Copyright (C) 2023 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.AOD 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 /** Breaks down AOD->OCCLUDED transition into discrete steps for corresponding views to consume. */ 33 @SysUISingleton 34 class AodToOccludedTransitionViewModel 35 @Inject 36 constructor(animationFlow: KeyguardTransitionAnimationFlow) : DeviceEntryIconTransition { 37 private val transitionAnimation = 38 animationFlow.setup( 39 duration = FromAodTransitionInteractor.TO_OCCLUDED_DURATION, 40 edge = Edge.create(from = AOD, to = OCCLUDED), 41 ) 42 43 /** 44 * Fade out the lockscreen during a transition to OCCLUDED. 45 * 46 * This happens when pressing the power button while a SHOW_WHEN_LOCKED activity is on the top 47 * of the task stack, as well as when the power button is double tapped on the LOCKSCREEN (the 48 * first tap transitions to AOD, the second cancels that transition and starts AOD -> OCCLUDED. 49 */ lockscreenAlphanull50 fun lockscreenAlpha(viewState: ViewStateAccessor): Flow<Float> { 51 var currentAlpha = 0f 52 return transitionAnimation.sharedFlow( 53 duration = 250.milliseconds, 54 startTime = 55 if (ambientAod()) { 56 100.milliseconds // Wait for the light reveal to "hit" the LS elements. 57 } else { 58 0.milliseconds 59 }, 60 onStart = { 61 if (ambientAod()) { 62 currentAlpha = viewState.alpha() 63 } else { 64 currentAlpha = 0f 65 } 66 }, 67 onStep = { MathUtils.lerp(currentAlpha, 0f, it) }, 68 ) 69 } 70 71 override val deviceEntryParentViewAlpha = transitionAnimation.immediatelyTransitionTo(0f) 72 } 73