AbstractWheelAdapter.java
2.21 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
/*
* android-spinnerwheel
* https://github.com/ai212983/android-spinnerwheel
*
* based on
*
* Android Wheel Control.
* https://code.google.com/p/android-wheel/
*
* Copyright 2011 Yuri Kanivets
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ectrip.cyt.spinnerwheel.adapters;
import java.util.LinkedList;
import java.util.List;
import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
/**
* Abstract Wheel adapter.
*/
public abstract class AbstractWheelAdapter implements WheelViewAdapter {
// Observers
private List<DataSetObserver> datasetObservers;
@Override
public View getEmptyItem(View convertView, ViewGroup parent) {
return null;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
if (datasetObservers == null) {
datasetObservers = new LinkedList<DataSetObserver>();
}
datasetObservers.add(observer);
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
if (datasetObservers != null) {
datasetObservers.remove(observer);
}
}
/**
* Notifies observers about data changing
*/
protected void notifyDataChangedEvent() {
if (datasetObservers != null) {
for (DataSetObserver observer : datasetObservers) {
observer.onChanged();
}
}
}
/**
* Notifies observers about invalidating data
*/
protected void notifyDataInvalidatedEvent() {
if (datasetObservers != null) {
for (DataSetObserver observer : datasetObservers) {
observer.onInvalidated();
}
}
}
}