1 /*
2  * Copyright (C) 2017 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;
18 
19 import android.os.Trace;
20 
21 import com.android.systemui.Dumpable;
22 import com.android.systemui.dump.DumpManager;
23 
24 import java.io.PrintWriter;
25 
26 import javax.inject.Inject;
27 import javax.inject.Singleton;
28 
29 /**
30  * Tracks the screen lifecycle.
31  */
32 @Singleton
33 public class ScreenLifecycle extends Lifecycle<ScreenLifecycle.Observer> implements Dumpable {
34 
35     public static final int SCREEN_OFF = 0;
36     public static final int SCREEN_TURNING_ON = 1;
37     public static final int SCREEN_ON = 2;
38     public static final int SCREEN_TURNING_OFF = 3;
39 
40     private int mScreenState = SCREEN_OFF;
41 
42     @Inject
ScreenLifecycle(DumpManager dumpManager)43     public ScreenLifecycle(DumpManager dumpManager) {
44         dumpManager.registerDumpable(getClass().getSimpleName(), this);
45     }
46 
getScreenState()47     public int getScreenState() {
48         return mScreenState;
49     }
50 
dispatchScreenTurningOn()51     public void dispatchScreenTurningOn() {
52         setScreenState(SCREEN_TURNING_ON);
53         dispatch(Observer::onScreenTurningOn);
54     }
55 
dispatchScreenTurnedOn()56     public void dispatchScreenTurnedOn() {
57         setScreenState(SCREEN_ON);
58         dispatch(Observer::onScreenTurnedOn);
59     }
60 
dispatchScreenTurningOff()61     public void dispatchScreenTurningOff() {
62         setScreenState(SCREEN_TURNING_OFF);
63         dispatch(Observer::onScreenTurningOff);
64     }
65 
dispatchScreenTurnedOff()66     public void dispatchScreenTurnedOff() {
67         setScreenState(SCREEN_OFF);
68         dispatch(Observer::onScreenTurnedOff);
69     }
70 
71     @Override
dump(PrintWriter pw, String[] args)72     public void dump(PrintWriter pw, String[] args) {
73         pw.println("ScreenLifecycle:");
74         pw.println("  mScreenState=" + mScreenState);
75     }
76 
setScreenState(int screenState)77     private void setScreenState(int screenState) {
78         mScreenState = screenState;
79         Trace.traceCounter(Trace.TRACE_TAG_APP, "screenState", screenState);
80     }
81 
82     public interface Observer {
onScreenTurningOn()83         default void onScreenTurningOn() {}
onScreenTurnedOn()84         default void onScreenTurnedOn() {}
onScreenTurningOff()85         default void onScreenTurningOff() {}
onScreenTurnedOff()86         default void onScreenTurnedOff() {}
87     }
88 
89 }
90