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.FromAlternateBouncerTransitionInteractor 22 import com.android.systemui.keyguard.shared.model.Edge 23 import com.android.systemui.keyguard.shared.model.KeyguardState.ALTERNATE_BOUNCER 24 import com.android.systemui.keyguard.shared.model.KeyguardState.LOCKSCREEN 25 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow 26 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition 27 import javax.inject.Inject 28 import kotlin.time.Duration.Companion.milliseconds 29 import kotlinx.coroutines.flow.Flow 30 31 /** 32 * Breaks down ALTERNATE_BOUNCER->LOCKSCREEN transition into discrete steps for corresponding views 33 * to consume. 34 */ 35 @SysUISingleton 36 class AlternateBouncerToLockscreenTransitionViewModel 37 @Inject 38 constructor( 39 animationFlow: KeyguardTransitionAnimationFlow, 40 ) : DeviceEntryIconTransition { 41 private val transitionAnimation = 42 animationFlow.setup( 43 duration = FromAlternateBouncerTransitionInteractor.TO_LOCKSCREEN_DURATION, 44 edge = Edge.create(from = ALTERNATE_BOUNCER, to = LOCKSCREEN), 45 ) 46 lockscreenAlphanull47 fun lockscreenAlpha(viewState: ViewStateAccessor): Flow<Float> { 48 var startAlpha = 1f 49 return transitionAnimation.sharedFlow( 50 duration = 250.milliseconds, 51 onStart = { startAlpha = viewState.alpha() }, 52 onStep = { MathUtils.lerp(startAlpha, 1f, it) }, 53 ) 54 } 55 56 val deviceEntryBackgroundViewAlpha: Flow<Float> = 57 transitionAnimation.immediatelyTransitionTo(1f) 58 override val deviceEntryParentViewAlpha: Flow<Float> = 59 transitionAnimation.immediatelyTransitionTo(1f) 60 } 61