1 /*
2  * Copyright (C) 2024 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.FromDozingTransitionInteractor.Companion.TO_GONE_DURATION
21 import com.android.systemui.keyguard.shared.model.Edge
22 import com.android.systemui.keyguard.shared.model.KeyguardState.DOZING
23 import com.android.systemui.keyguard.shared.model.KeyguardState.GONE
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 /** Breaks down DOZING->GONE transition into discrete steps for corresponding views to consume. */
33 @ExperimentalCoroutinesApi
34 @SysUISingleton
35 class DozingToGoneTransitionViewModel
36 @Inject
37 constructor(
38     animationFlow: KeyguardTransitionAnimationFlow,
39 ) : DeviceEntryIconTransition {
40 
41     private val transitionAnimation =
42         animationFlow
43             .setup(
44                 duration = TO_GONE_DURATION,
45                 edge = Edge.create(from = DOZING, to = Scenes.Gone),
46             )
47             .setupWithoutSceneContainer(
48                 edge = Edge.create(from = DOZING, to = GONE),
49             )
50 
lockscreenAlphanull51     fun lockscreenAlpha(viewState: ViewStateAccessor): Flow<Float> {
52         return transitionAnimation.sharedFlow(
53             duration = 200.milliseconds,
54             onStart = { 0f },
55             onStep = { 0f },
56         )
57     }
58 
59     override val deviceEntryParentViewAlpha: Flow<Float> =
60         transitionAnimation.immediatelyTransitionTo(0f)
61 }
62