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.app.tracing.traceSection
21 import java.util.concurrent.CopyOnWriteArrayList
22 import javax.inject.Inject
23 import javax.inject.Singleton
24 
25 @Singleton
26 class LifecycleScreenStatusProvider @Inject constructor(screenLifecycle: ScreenLifecycle) :
27     ScreenStatusProvider, ScreenLifecycle.Observer {
28 
29     init {
30         screenLifecycle.addObserver(this)
31     }
32 
33     private val listeners: MutableList<ScreenListener> = CopyOnWriteArrayList()
34 
removeCallbacknull35     override fun removeCallback(listener: ScreenListener) {
36         listeners.remove(listener)
37     }
38 
addCallbacknull39     override fun addCallback(listener: ScreenListener) {
40         listeners.add(listener)
41     }
42 
onScreenTurnedOnnull43     override fun onScreenTurnedOn() {
44         traceSection("$TRACE_TAG#onScreenTurnedOn") {
45             listeners.forEach(ScreenListener::onScreenTurnedOn)
46         }
47     }
48 
onScreenTurningOffnull49     override fun onScreenTurningOff() {
50         traceSection("$TRACE_TAG#onScreenTurningOff") {
51             listeners.forEach(ScreenListener::onScreenTurningOff)
52         }
53     }
54 
onScreenTurningOnnull55     override fun onScreenTurningOn() {
56         traceSection("$TRACE_TAG#onScreenTurningOn") {
57             listeners.forEach(ScreenListener::onScreenTurningOn)
58         }
59     }
60 }
61 
62 private const val TRACE_TAG = "LifecycleScreenStatusProvider"