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.flags
18 
19 import com.android.systemui.keyguard.WakefulnessLifecycle
20 import javax.inject.Inject
21 
22 /** Returns true when the device is "asleep" as defined by the [WakefullnessLifecycle]. */
23 class ScreenIdleCondition
24 @Inject
25 constructor(
26     private val wakefulnessLifecycle: WakefulnessLifecycle,
27 ) : ConditionalRestarter.Condition {
28 
29     var listenersAdded = false
30     var retryFn: (() -> Unit)? = null
31 
32     val observer =
33         object : WakefulnessLifecycle.Observer {
34             override fun onFinishedGoingToSleep() {
35                 retryFn?.invoke()
36             }
37         }
38 
39     override fun canRestartNow(retryFn: () -> Unit): Boolean {
40         if (!listenersAdded) {
41             listenersAdded = true
42             wakefulnessLifecycle.addObserver(observer)
43         }
44 
45         this.retryFn = retryFn
46 
47         return wakefulnessLifecycle.wakefulness == WakefulnessLifecycle.WAKEFULNESS_ASLEEP
48     }
49 }
50