|
1
6
7 package swingwtx.swing;
8
9 import java.util.*;
10
11 public class DefaultComboBoxModel extends AbstractListModel implements MutableComboBoxModel {
12
13 protected Vector objects;
14 protected Object  selectedObject;
15
16 public DefaultComboBoxModel() {objects = new Vector(); }
17 public DefaultComboBoxModel(Object items[]) {
18
19 objects = new Vector(items.length);
20 for (int i = 0; i < items.length; i++) {
21 objects.add(items[i]);
22 }
23 if ( objects.size() > 0 )
24 selectedObject = objects.get(0);
25 }
26
27 public DefaultComboBoxModel(Vector v) {
28 objects = v;
29 if (objects.size() > 0)
30 selectedObject = objects.get(0);
31 }
32
33 public void setSelectedItem(Object anObject) {
34 if ((selectedObject != null && !selectedObject.equals( anObject )) || selectedObject == null && anObject != null) {
35 selectedObject = anObject;
36 fireContentsChanged(this, -1, -1);
37 }
38 }
39
40 public Object getSelectedItem() {
41 return selectedObject;
42 }
43
44 public int getSize() {
45 return objects.size();
46 }
47
48 public Object getElementAt(int index) {
49 if (index >= 0 && index < objects.size())
50 return objects.get(index);
51 else
52 return null;
53 }
54
55 public int getIndexOf(Object anObject) {
56 return objects.indexOf(anObject);
57 }
58
59 public void addElement(Object anObject) {
60 objects.add(anObject);
61 fireIntervalAdded(this,objects.size()-1, objects.size()-1);
62 if (objects.size() == 1 && selectedObject == null && anObject != null)
63 setSelectedItem( anObject );
64 }
65
66 public void insertElementAt(Object anObject,int index) {
67 objects.insertElementAt(anObject,index);
68 fireIntervalAdded(this, index, index);
69 }
70
71 public void removeElementAt(int index) {
72 if (objects.get(index) == selectedObject) {
73 if (index == 0)
74 setSelectedItem(objects.size() == 1 ? null : objects.get( index + 1 ) );
75 else
76 setSelectedItem(objects.get(index - 1 ));
77 }
78
79 objects.removeElementAt(index);
80
81 fireIntervalRemoved(this, index, index);
82 }
83
84 public void removeElement(Object anObject) {
85 objects.remove(anObject);
86 }
87
88 public void removeAllElements() {
89 if ( objects.size() > 0 ) {
90 int firstIndex = 0;
91 int lastIndex = objects.size() - 1;
92 objects.removeAllElements();
93 selectedObject = null;
94 fireIntervalRemoved(this, firstIndex, lastIndex);
95 }
96 else
97 selectedObject = null;
98 }
99 }
100
101 |
Popular Tags |
Java API By Example, From Geeks To Geeks.