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.FromDozingTransitionInteractor
21 import com.android.systemui.keyguard.shared.model.Edge
22 import com.android.systemui.keyguard.shared.model.KeyguardState.DOZING
23 import com.android.systemui.keyguard.shared.model.KeyguardState.LOCKSCREEN
24 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
25 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition
26 import javax.inject.Inject
27 import kotlin.time.Duration.Companion.milliseconds
28 import kotlinx.coroutines.ExperimentalCoroutinesApi
29 import kotlinx.coroutines.flow.Flow
30 
31 /**
32  * Breaks down DOZING->LOCKSCREEN transition into discrete steps for corresponding views to consume.
33  */
34 @ExperimentalCoroutinesApi
35 @SysUISingleton
36 class DozingToLockscreenTransitionViewModel
37 @Inject
38 constructor(
39     animationFlow: KeyguardTransitionAnimationFlow,
40 ) : DeviceEntryIconTransition {
41     private val transitionAnimation =
42         animationFlow.setup(
43             duration = FromDozingTransitionInteractor.TO_LOCKSCREEN_DURATION,
44             edge = Edge.create(from = DOZING, to = LOCKSCREEN),
45         )
46 
47     val shortcutsAlpha: Flow<Float> =
48         transitionAnimation.sharedFlow(
49             duration = 150.milliseconds,
<lambda>null50             onStep = { it },
<lambda>null51             onCancel = { 0f },
52         )
53 
54     val lockscreenAlpha: Flow<Float> = shortcutsAlpha
55 
56     val deviceEntryBackgroundViewAlpha: Flow<Float> =
57         transitionAnimation.immediatelyTransitionTo(1f)
58 
59     override val deviceEntryParentViewAlpha: Flow<Float> =
60         transitionAnimation.immediatelyTransitionTo(1f)
61 }
62