1 /*
2  * Copyright (C) 2022 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.doze
18 
19 import com.android.systemui.dagger.SysUISingleton
20 import com.android.systemui.statusbar.policy.CallbackController
21 import javax.inject.Inject
22 
23 /** Receives doze transition events, and passes those events to registered callbacks. */
24 @SysUISingleton
25 class DozeTransitionListener @Inject constructor() :
26     DozeMachine.Part, CallbackController<DozeTransitionCallback> {
27     val callbacks = mutableSetOf<DozeTransitionCallback>()
28     var oldState = DozeMachine.State.UNINITIALIZED
29     var newState = DozeMachine.State.UNINITIALIZED
30 
transitionTonull31     override fun transitionTo(oldState: DozeMachine.State, newState: DozeMachine.State) {
32         this.oldState = oldState
33         this.newState = newState
34         callbacks.forEach { it.onDozeTransition(oldState, newState) }
35     }
36 
addCallbacknull37     override fun addCallback(callback: DozeTransitionCallback) {
38         callbacks.add(callback)
39     }
40 
removeCallbacknull41     override fun removeCallback(callback: DozeTransitionCallback) {
42         callbacks.remove(callback)
43     }
44 }
45 
46 interface DozeTransitionCallback {
onDozeTransitionnull47     fun onDozeTransition(oldState: DozeMachine.State, newState: DozeMachine.State)
48 }
49