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.FromPrimaryBouncerTransitionInteractor
22 import com.android.systemui.keyguard.shared.model.Edge
23 import com.android.systemui.keyguard.shared.model.KeyguardState.LOCKSCREEN
24 import com.android.systemui.keyguard.shared.model.KeyguardState.PRIMARY_BOUNCER
25 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
26 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition
27 import com.android.systemui.scene.shared.model.Scenes
28 import javax.inject.Inject
29 import kotlin.time.Duration.Companion.milliseconds
30 import kotlinx.coroutines.ExperimentalCoroutinesApi
31 import kotlinx.coroutines.flow.Flow
32 
33 /**
34  * Breaks down PRIMARY BOUNCER->LOCKSCREEN transition into discrete steps for corresponding views to
35  * consume.
36  */
37 @ExperimentalCoroutinesApi
38 @SysUISingleton
39 class PrimaryBouncerToLockscreenTransitionViewModel
40 @Inject
41 constructor(
42     animationFlow: KeyguardTransitionAnimationFlow,
43 ) : DeviceEntryIconTransition {
44     private val transitionAnimation =
45         animationFlow
46             .setup(
47                 duration = FromPrimaryBouncerTransitionInteractor.TO_LOCKSCREEN_DURATION,
48                 edge = Edge.create(from = Scenes.Bouncer, to = LOCKSCREEN),
49             )
50             .setupWithoutSceneContainer(
51                 edge = Edge.create(from = PRIMARY_BOUNCER, to = LOCKSCREEN),
52             )
53 
54     val shortcutsAlpha: Flow<Float> =
55         transitionAnimation.sharedFlow(
56             duration = 250.milliseconds,
57             interpolator = EMPHASIZED_ACCELERATE,
<lambda>null58             onStep = { it }
59         )
60 
61     val lockscreenAlpha: Flow<Float> = shortcutsAlpha
62 
63     val deviceEntryBackgroundViewAlpha: Flow<Float> =
64         transitionAnimation.immediatelyTransitionTo(1f)
65     override val deviceEntryParentViewAlpha: Flow<Float> =
66         transitionAnimation.immediatelyTransitionTo(1f)
67 }
68