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.FileDescriptor;
25 import java.io.PrintWriter;
26 
27 import javax.inject.Inject;
28 import javax.inject.Singleton;
29 
30 /**
31  * Tracks the screen lifecycle.
32  */
33 @Singleton
34 public class ScreenLifecycle extends Lifecycle<ScreenLifecycle.Observer> implements Dumpable {
35 
36     public static final int SCREEN_OFF = 0;
37     public static final int SCREEN_TURNING_ON = 1;
38     public static final int SCREEN_ON = 2;
39     public static final int SCREEN_TURNING_OFF = 3;
40 
41     private int mScreenState = SCREEN_OFF;
42 
43     @Inject
ScreenLifecycle(DumpManager dumpManager)44     public ScreenLifecycle(DumpManager dumpManager) {
45         dumpManager.registerDumpable(getClass().getSimpleName(), this);
46     }
47 
getScreenState()48     public int getScreenState() {
49         return mScreenState;
50     }
51 
dispatchScreenTurningOn()52     public void dispatchScreenTurningOn() {
53         setScreenState(SCREEN_TURNING_ON);
54         dispatch(Observer::onScreenTurningOn);
55     }
56 
dispatchScreenTurnedOn()57     public void dispatchScreenTurnedOn() {
58         setScreenState(SCREEN_ON);
59         dispatch(Observer::onScreenTurnedOn);
60     }
61 
dispatchScreenTurningOff()62     public void dispatchScreenTurningOff() {
63         setScreenState(SCREEN_TURNING_OFF);
64         dispatch(Observer::onScreenTurningOff);
65     }
66 
dispatchScreenTurnedOff()67     public void dispatchScreenTurnedOff() {
68         setScreenState(SCREEN_OFF);
69         dispatch(Observer::onScreenTurnedOff);
70     }
71 
72     @Override
dump(FileDescriptor fd, PrintWriter pw, String[] args)73     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
74         pw.println("ScreenLifecycle:");
75         pw.println("  mScreenState=" + mScreenState);
76     }
77 
setScreenState(int screenState)78     private void setScreenState(int screenState) {
79         mScreenState = screenState;
80         Trace.traceCounter(Trace.TRACE_TAG_APP, "screenState", screenState);
81     }
82 
83     public interface Observer {
onScreenTurningOn()84         default void onScreenTurningOn() {}
onScreenTurnedOn()85         default void onScreenTurnedOn() {}
onScreenTurningOff()86         default void onScreenTurningOff() {}
onScreenTurnedOff()87         default void onScreenTurnedOff() {}
88     }
89 
90 }
91