ScreenLifecycle.java revision 369907f02efd7f25d8063f38ecef6cf65c703572 
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 com.android.systemui.Dumpable;
20
21import java.io.FileDescriptor;
22import java.io.PrintWriter;
23
24/**
25 * Tracks the screen lifecycle.
26 */
27public class ScreenLifecycle extends Lifecycle<ScreenLifecycle.Observer> implements Dumpable {
28
29    public static final int SCREEN_OFF = 0;
30    public static final int SCREEN_TURNING_ON = 1;
31    public static final int SCREEN_ON = 2;
32    public static final int SCREEN_TURNING_OFF = 3;
33
34    private int mScreenState = SCREEN_OFF;
35
36    public int getScreenState() {
37        return mScreenState;
38    }
39
40    public void dispatchScreenTurningOn() {
41        mScreenState = SCREEN_TURNING_ON;
42        dispatch(Observer::onScreenTurningOn);
43    }
44
45    public void dispatchScreenTurnedOn() {
46        mScreenState = SCREEN_ON;
47        dispatch(Observer::onScreenTurnedOn);
48    }
49
50    public void dispatchScreenTurningOff() {
51        mScreenState = SCREEN_TURNING_OFF;
52        dispatch(Observer::onScreenTurningOff);
53    }
54
55    public void dispatchScreenTurnedOff() {
56        mScreenState = SCREEN_OFF;
57        dispatch(Observer::onScreenTurnedOff);
58    }
59
60    @Override
61    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
62        pw.println("ScreenLifecycle:");
63        pw.println("  mScreenState=" + mScreenState);
64    }
65
66    public interface Observer {
67        default void onScreenTurningOn() {}
68        default void onScreenTurnedOn() {}
69        default void onScreenTurningOff() {}
70        default void onScreenTurnedOff() {}
71    }
72
73}
74