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.app.animation.Interpolators.EMPHASIZED_ACCELERATE
20 import com.android.systemui.dagger.SysUISingleton
21 import com.android.systemui.keyguard.domain.interactor.FromLockscreenTransitionInteractor.Companion.TO_DREAMING_DURATION
22 import com.android.systemui.keyguard.shared.model.Edge
23 import com.android.systemui.keyguard.shared.model.KeyguardState.DREAMING
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 LOCKSCREEN->DREAMING transition into discrete steps for corresponding views to
33  * consume.
34  */
35 @SysUISingleton
36 class LockscreenToDreamingTransitionViewModel
37 @Inject
38 constructor(
39     shadeDependentFlows: ShadeDependentFlows,
40     animationFlow: KeyguardTransitionAnimationFlow,
41 ) : DeviceEntryIconTransition {
42     private val transitionAnimation =
43         animationFlow.setup(
44             duration = TO_DREAMING_DURATION,
45             edge = Edge.create(from = LOCKSCREEN, to = DREAMING),
46         )
47 
48     /** Lockscreen views y-translation */
lockscreenTranslationYnull49     fun lockscreenTranslationY(translatePx: Int): Flow<Float> {
50         return transitionAnimation.sharedFlow(
51             duration = 500.milliseconds,
52             onStep = { it * translatePx },
53             // Reset on cancel or finish
54             onFinish = { 0f },
55             onCancel = { 0f },
56             interpolator = EMPHASIZED_ACCELERATE,
57         )
58     }
59 
60     /** Lockscreen views alpha */
61     val lockscreenAlpha: Flow<Float> =
62         transitionAnimation.sharedFlow(
63             duration = 250.milliseconds,
<lambda>null64             onStep = { 1f - it },
65         )
66 
67     val shortcutsAlpha: Flow<Float> =
68         transitionAnimation.sharedFlow(
69             duration = 250.milliseconds,
<lambda>null70             onStep = { 1 - it },
<lambda>null71             onFinish = { 0f },
<lambda>null72             onCancel = { 1f },
73         )
74 
75     override val deviceEntryParentViewAlpha: Flow<Float> =
76         shadeDependentFlows.transitionFlow(
77             flowWhenShadeIsNotExpanded = lockscreenAlpha,
78             flowWhenShadeIsExpanded = transitionAnimation.immediatelyTransitionTo(0f),
79         )
80 
81     companion object {
82         @JvmField val DREAMING_ANIMATION_DURATION_MS = TO_DREAMING_DURATION.inWholeMilliseconds
83     }
84 }
85