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.shared.model.Edge
21 import com.android.systemui.keyguard.shared.model.KeyguardState.LOCKSCREEN
22 import com.android.systemui.keyguard.shared.model.KeyguardState.OFF
23 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
24 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition
25 import javax.inject.Inject
26 import kotlin.time.Duration.Companion.milliseconds
27 import kotlinx.coroutines.flow.Flow
28 
29 @SysUISingleton
30 class OffToLockscreenTransitionViewModel
31 @Inject
32 constructor(
33     animationFlow: KeyguardTransitionAnimationFlow,
34 ) : DeviceEntryIconTransition {
35 
36     private val transitionAnimation =
37         animationFlow.setup(
38             duration = 250.milliseconds,
39             edge = Edge.create(from = OFF, to = LOCKSCREEN),
40         )
41 
42     val shortcutsAlpha: Flow<Float> =
43         transitionAnimation.sharedFlow(
44             duration = 250.milliseconds,
<lambda>null45             onStep = { it },
<lambda>null46             onCancel = { 0f },
47         )
48 
49     override val deviceEntryParentViewAlpha: Flow<Float> =
50         transitionAnimation.immediatelyTransitionTo(1f)
51 }
52