1/*
2 * Copyright (C) 2013 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.camera.data;
18
19import android.database.ContentObserver;
20
21/**
22 * Listening to the changes to the local image and video data. onChange will
23 * happen on the main thread.
24 */
25public class FilmstripContentObserver extends ContentObserver {
26
27    private ChangeListener mChangeListener;
28
29    public interface ChangeListener {
30        public void onChange();
31    }
32
33    private boolean mActivityPaused = false;
34    private boolean mMediaDataChangedDuringPause = false;
35
36    public FilmstripContentObserver() {
37        super(null);
38    }
39
40    public void setForegroundChangeListener(ChangeListener changeListener) {
41        mChangeListener = changeListener;
42    }
43
44    public void removeForegroundChangeListener() {
45        mChangeListener = null;
46    }
47
48    /**
49     * When the activity is paused and MediaObserver get onChange() call, then
50     * we would like to set a dirty bit to reload the data at onResume().
51     */
52    @Override
53    public void onChange(boolean selfChange) {
54        if (mChangeListener != null) {
55            mChangeListener.onChange();
56        }
57        if (mActivityPaused) {
58            mMediaDataChangedDuringPause = true;
59        }
60    }
61
62    public void setActivityPaused(boolean paused) {
63        mActivityPaused = paused;
64        if (!paused) {
65            mMediaDataChangedDuringPause = false;
66        }
67    }
68
69    public boolean isMediaDataChangedDuringPause() {
70        return mMediaDataChangedDuringPause;
71    }
72}
73