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 com.android.systemui.dagger.SysUISingleton
20 import com.android.systemui.keyguard.domain.interactor.FromGoneTransitionInteractor.Companion.TO_DREAMING_DURATION
21 import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInteractor
22 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
23 import javax.inject.Inject
24 import kotlin.time.Duration.Companion.milliseconds
25 import kotlinx.coroutines.flow.Flow
26 
27 /**
28  * Breaks down GONE->DREAMING_LOCKSCREEN_HOSTED transition into discrete steps for corresponding
29  * views to consume.
30  */
31 @SysUISingleton
32 class GoneToDreamingLockscreenHostedTransitionViewModel
33 @Inject
34 constructor(
35     interactor: KeyguardTransitionInteractor,
36 ) {
37 
38     private val transitionAnimation =
39         KeyguardTransitionAnimationFlow(
40             transitionDuration = TO_DREAMING_DURATION,
41             transitionFlow = interactor.goneToDreamingLockscreenHostedTransition,
42         )
43 
44     /** Lockscreen views alpha - hide immediately */
45     val lockscreenAlpha: Flow<Float> =
46         transitionAnimation.createFlow(
47             duration = 1.milliseconds,
48             onStep = { 0f },
49         )
50 }
51