ScreenLifecycle.java revision 51465ea3b667a4123baf7eebb8f590aeaec2aafe 
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
17package com.android.systemui.keyguard;
18
19import android.os.Trace;
20
21import com.android.systemui.Dumpable;
22
23import java.io.FileDescriptor;
24import java.io.PrintWriter;
25
26/**
27 * Tracks the screen lifecycle.
28 */
29public class ScreenLifecycle extends Lifecycle<ScreenLifecycle.Observer> implements Dumpable {
30
31    public static final int SCREEN_OFF = 0;
32    public static final int SCREEN_TURNING_ON = 1;
33    public static final int SCREEN_ON = 2;
34    public static final int SCREEN_TURNING_OFF = 3;
35
36    private int mScreenState = SCREEN_OFF;
37
38    public int getScreenState() {
39        return mScreenState;
40    }
41
42    public void dispatchScreenTurningOn() {
43        setScreenState(SCREEN_TURNING_ON);
44        dispatch(Observer::onScreenTurningOn);
45    }
46
47    public void dispatchScreenTurnedOn() {
48        setScreenState(SCREEN_ON);
49        dispatch(Observer::onScreenTurnedOn);
50    }
51
52    public void dispatchScreenTurningOff() {
53        setScreenState(SCREEN_TURNING_OFF);
54        dispatch(Observer::onScreenTurningOff);
55    }
56
57    public void dispatchScreenTurnedOff() {
58        setScreenState(SCREEN_OFF);
59        dispatch(Observer::onScreenTurnedOff);
60    }
61
62    @Override
63    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
64        pw.println("ScreenLifecycle:");
65        pw.println("  mScreenState=" + mScreenState);
66    }
67
68    private void setScreenState(int screenState) {
69        mScreenState = screenState;
70        Trace.traceCounter(Trace.TRACE_TAG_APP, "screenState", screenState);
71    }
72
73    public interface Observer {
74        default void onScreenTurningOn() {}
75        default void onScreenTurnedOn() {}
76        default void onScreenTurningOff() {}
77        default void onScreenTurnedOff() {}
78    }
79
80}
81