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 android.util.MathUtils
20 import com.android.systemui.dagger.SysUISingleton
21 import com.android.systemui.keyguard.domain.interactor.FromLockscreenTransitionInteractor
22 import com.android.systemui.keyguard.shared.model.Edge
23 import com.android.systemui.keyguard.shared.model.KeyguardState.GONE
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.KeyguardTransitionAnimationFlow.FlowBuilder
27 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition
28 import com.android.systemui.scene.shared.model.Scenes
29 import com.android.systemui.statusbar.SysuiStatusBarStateController
30 import javax.inject.Inject
31 import kotlin.time.Duration.Companion.milliseconds
32 import kotlinx.coroutines.ExperimentalCoroutinesApi
33 import kotlinx.coroutines.flow.Flow
34 
35 /**
36  * Breaks down LOCKSCREEN->GONE transition into discrete steps for corresponding views to consume.
37  */
38 @ExperimentalCoroutinesApi
39 @SysUISingleton
40 class LockscreenToGoneTransitionViewModel
41 @Inject
42 constructor(
43     animationFlow: KeyguardTransitionAnimationFlow,
44     private val statusBarStateController: SysuiStatusBarStateController,
45 ) : DeviceEntryIconTransition {
46 
47     private val transitionAnimation: FlowBuilder =
48         animationFlow
49             .setup(
50                 duration = FromLockscreenTransitionInteractor.TO_GONE_DURATION,
51                 edge = Edge.create(from = LOCKSCREEN, to = Scenes.Gone),
52             )
53             .setupWithoutSceneContainer(
54                 edge = Edge.create(from = LOCKSCREEN, to = GONE),
55             )
56 
57     val shortcutsAlpha: Flow<Float> =
58         transitionAnimation.sharedFlow(
59             duration = 200.milliseconds,
<lambda>null60             onStep = { 1 - it },
<lambda>null61             onFinish = { 0f },
<lambda>null62             onCancel = { 1f },
63         )
64 
notificationAlphanull65     fun notificationAlpha(viewState: ViewStateAccessor): Flow<Float> {
66         var startAlpha = 1f
67         var leaveShadeOpen = false
68 
69         return transitionAnimation.sharedFlow(
70             duration = 200.milliseconds,
71             onStart = {
72                 leaveShadeOpen = statusBarStateController.leaveOpenOnKeyguardHide()
73                 startAlpha = viewState.alpha()
74             },
75             onStep = {
76                 if (leaveShadeOpen) {
77                     1f
78                 } else {
79                     MathUtils.lerp(startAlpha, 0f, it)
80                 }
81             },
82         )
83     }
84 
lockscreenAlphanull85     fun lockscreenAlpha(viewState: ViewStateAccessor): Flow<Float> {
86         var startAlpha = 1f
87         return transitionAnimation.sharedFlow(
88             duration = 200.milliseconds,
89             onStart = { startAlpha = viewState.alpha() },
90             onStep = { MathUtils.lerp(startAlpha, 0f, it) },
91             onFinish = { 0f },
92             onCancel = { 1f },
93         )
94     }
95 
96     override val deviceEntryParentViewAlpha: Flow<Float> =
97         transitionAnimation.immediatelyTransitionTo(0f)
98 }
99