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.FromLockscreenTransitionInteractor
21 import com.android.systemui.keyguard.shared.model.Edge
22 import com.android.systemui.keyguard.shared.model.KeyguardState.LOCKSCREEN
23 import com.android.systemui.keyguard.shared.model.KeyguardState.PRIMARY_BOUNCER
24 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
25 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition
26 import com.android.systemui.scene.shared.model.Scenes
27 import javax.inject.Inject
28 import kotlin.time.Duration.Companion.milliseconds
29 import kotlinx.coroutines.ExperimentalCoroutinesApi
30 import kotlinx.coroutines.flow.Flow
31 
32 /**
33  * Breaks down LOCKSCREEN->PRIMARY BOUNCER transition into discrete steps for corresponding views to
34  * consume.
35  */
36 @ExperimentalCoroutinesApi
37 @SysUISingleton
38 class LockscreenToPrimaryBouncerTransitionViewModel
39 @Inject
40 constructor(
41     shadeDependentFlows: ShadeDependentFlows,
42     animationFlow: KeyguardTransitionAnimationFlow,
43 ) : DeviceEntryIconTransition {
44     private val transitionAnimation =
45         animationFlow
46             .setup(
47                 duration = FromLockscreenTransitionInteractor.TO_PRIMARY_BOUNCER_DURATION,
48                 edge = Edge.create(from = LOCKSCREEN, to = Scenes.Bouncer),
49             )
50             .setupWithoutSceneContainer(
51                 edge = Edge.create(from = LOCKSCREEN, to = PRIMARY_BOUNCER),
52             )
53 
54     val shortcutsAlpha: Flow<Float> =
55         transitionAnimation.sharedFlow(
56             duration = FromLockscreenTransitionInteractor.TO_PRIMARY_BOUNCER_DURATION,
<lambda>null57             onStep = { 1f - it }
58         )
59 
60     val lockscreenAlpha: Flow<Float> = shortcutsAlpha
61 
62     override val deviceEntryParentViewAlpha: Flow<Float> =
63         shadeDependentFlows.transitionFlow(
64             flowWhenShadeIsNotExpanded =
65                 transitionAnimation.sharedFlow(
66                     duration = 250.milliseconds,
<lambda>null67                     onStep = { 1f - it },
<lambda>null68                     onFinish = { 0f }
69                 ),
70             flowWhenShadeIsExpanded = transitionAnimation.immediatelyTransitionTo(0f)
71         )
72 }
73