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.FromGoneTransitionInteractor.Companion.TO_DREAMING_DURATION
22 import com.android.systemui.keyguard.shared.model.Edge
23 import com.android.systemui.keyguard.shared.model.KeyguardState.DREAMING
24 import com.android.systemui.keyguard.shared.model.KeyguardState.GONE
25 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
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.flow.Flow
30 
31 /** Breaks down GONE->DREAMING transition into discrete steps for corresponding views to consume. */
32 @SysUISingleton
33 class GoneToDreamingTransitionViewModel
34 @Inject
35 constructor(
36     animationFlow: KeyguardTransitionAnimationFlow,
37 ) {
38 
39     private val transitionAnimation =
40         animationFlow
41             .setup(
42                 duration = TO_DREAMING_DURATION,
43                 edge = Edge.create(from = Scenes.Gone, to = DREAMING),
44             )
45             .setupWithoutSceneContainer(
46                 edge = Edge.create(from = GONE, to = DREAMING),
47             )
48 
49     /** Lockscreen views y-translation */
lockscreenTranslationYnull50     fun lockscreenTranslationY(translatePx: Int): Flow<Float> {
51         return transitionAnimation.sharedFlow(
52             duration = 500.milliseconds,
53             onStep = { it * translatePx },
54             // Reset on cancel or finish
55             onFinish = { 0f },
56             onCancel = { 0f },
57             interpolator = EMPHASIZED_ACCELERATE,
58         )
59     }
60 
61     /** Lockscreen views alpha */
62     val lockscreenAlpha: Flow<Float> =
63         transitionAnimation.sharedFlow(
64             duration = 250.milliseconds,
<lambda>null65             onStep = { 1f - it },
66         )
67 }
68