1 /*
2  * Copyright (C) 2021 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 package com.android.systemui.keyguard
17 
18 import com.android.systemui.unfold.updates.screen.ScreenStatusProvider
19 import com.android.systemui.unfold.updates.screen.ScreenStatusProvider.ScreenListener
20 import com.android.systemui.util.traceSection
21 import javax.inject.Inject
22 import javax.inject.Singleton
23 
24 @Singleton
25 class LifecycleScreenStatusProvider @Inject constructor(screenLifecycle: ScreenLifecycle) :
26     ScreenStatusProvider, ScreenLifecycle.Observer {
27 
28     init {
29         screenLifecycle.addObserver(this)
30     }
31 
32     private val listeners: MutableList<ScreenListener> = mutableListOf()
33 
34     override fun removeCallback(listener: ScreenListener) {
35         listeners.remove(listener)
36     }
37 
38     override fun addCallback(listener: ScreenListener) {
39         listeners.add(listener)
40     }
41 
42     override fun onScreenTurnedOn() {
43         traceSection("$TRACE_TAG#onScreenTurnedOn") {
44             listeners.forEach(ScreenListener::onScreenTurnedOn)
45         }
46     }
47 
48     override fun onScreenTurningOff() {
49         traceSection("$TRACE_TAG#onScreenTurningOff") {
50             listeners.forEach(ScreenListener::onScreenTurningOff)
51         }
52     }
53 
54     override fun onScreenTurningOn() {
55         traceSection("$TRACE_TAG#onScreenTurningOn") {
56             listeners.forEach(ScreenListener::onScreenTurningOn)
57         }
58     }
59 }
60 
61 private const val TRACE_TAG = "LifecycleScreenStatusProvider"