1 /*
<lambda>null2  * 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.common.ui.domain.interactor.ConfigurationInteractor
21 import com.android.systemui.dagger.SysUISingleton
22 import com.android.systemui.keyguard.domain.interactor.FromLockscreenTransitionInteractor.Companion.TO_OCCLUDED_DURATION
23 import com.android.systemui.keyguard.shared.model.Edge
24 import com.android.systemui.keyguard.shared.model.KeyguardState
25 import com.android.systemui.keyguard.shared.model.KeyguardState.OCCLUDED
26 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
27 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition
28 import com.android.systemui.res.R
29 import javax.inject.Inject
30 import kotlin.time.Duration.Companion.milliseconds
31 import kotlinx.coroutines.flow.Flow
32 import kotlinx.coroutines.flow.flatMapLatest
33 
34 /**
35  * Breaks down LOCKSCREEN->OCCLUDED transition into discrete steps for corresponding views to
36  * consume.
37  */
38 @SysUISingleton
39 class LockscreenToOccludedTransitionViewModel
40 @Inject
41 constructor(
42     shadeDependentFlows: ShadeDependentFlows,
43     configurationInteractor: ConfigurationInteractor,
44     animationFlow: KeyguardTransitionAnimationFlow,
45 ) : DeviceEntryIconTransition {
46 
47     private val transitionAnimation =
48         animationFlow.setup(
49             duration = TO_OCCLUDED_DURATION,
50             edge = Edge.create(from = KeyguardState.LOCKSCREEN, to = OCCLUDED),
51         )
52 
53     /** Lockscreen views alpha */
54     val lockscreenAlpha: Flow<Float> =
55         transitionAnimation.sharedFlow(
56             duration = 250.milliseconds,
57             onStep = { 1f - it },
58             name = "LOCKSCREEN->OCCLUDED: lockscreenAlpha",
59         )
60 
61     val shortcutsAlpha: Flow<Float> =
62         transitionAnimation.sharedFlow(
63             duration = 250.milliseconds,
64             onStep = { 1 - it },
65             onFinish = { 0f },
66             onCancel = { 1f },
67         )
68 
69     /** Lockscreen views y-translation */
70     val lockscreenTranslationY: Flow<Float> =
71         configurationInteractor
72             .dimensionPixelSize(R.dimen.lockscreen_to_occluded_transition_lockscreen_translation_y)
73             .flatMapLatest { translatePx ->
74                 transitionAnimation.sharedFlow(
75                     duration = TO_OCCLUDED_DURATION,
76                     onStep = { value -> value * translatePx },
77                     // Reset on cancel or finish
78                     onFinish = { 0f },
79                     onCancel = { 0f },
80                     interpolator = EMPHASIZED_ACCELERATE,
81                 )
82             }
83 
84     override val deviceEntryParentViewAlpha: Flow<Float> =
85         shadeDependentFlows.transitionFlow(
86             flowWhenShadeIsNotExpanded = lockscreenAlpha,
87             flowWhenShadeIsExpanded = transitionAnimation.immediatelyTransitionTo(0f),
88         )
89 }
90