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.FromGoneTransitionInteractor.Companion.TO_DREAMING_DURATION
21 import com.android.systemui.keyguard.shared.model.Edge
22 import com.android.systemui.keyguard.shared.model.KeyguardState.DREAMING_LOCKSCREEN_HOSTED
23 import com.android.systemui.keyguard.shared.model.KeyguardState.GONE
24 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
25 import com.android.systemui.scene.shared.model.Scenes
26 import javax.inject.Inject
27 import kotlin.time.Duration.Companion.milliseconds
28 import kotlinx.coroutines.flow.Flow
29 
30 /**
31  * Breaks down GONE->DREAMING_LOCKSCREEN_HOSTED transition into discrete steps for corresponding
32  * views to consume.
33  */
34 @SysUISingleton
35 class GoneToDreamingLockscreenHostedTransitionViewModel
36 @Inject
37 constructor(
38     animationFlow: KeyguardTransitionAnimationFlow,
39 ) {
40 
41     private val transitionAnimation =
42         animationFlow
43             .setup(
44                 duration = TO_DREAMING_DURATION,
45                 edge = Edge.create(from = Scenes.Gone, to = DREAMING_LOCKSCREEN_HOSTED),
46             )
47             .setupWithoutSceneContainer(
48                 edge = Edge.create(from = GONE, to = DREAMING_LOCKSCREEN_HOSTED),
49             )
50 
51     /** Lockscreen views alpha - hide immediately */
52     val lockscreenAlpha: Flow<Float> =
53         transitionAnimation.sharedFlow(
54             duration = 1.milliseconds,
<lambda>null55             onStep = { 0f },
56         )
57 }
58