|
1 package text.list;
2
3 import text.*;
4
5 import javax.swing.*;
6 import javax.swing.event.*;
7 import java.util.*;
8
9 public abstract class ListData implements BoundedRangeModel
10 {
11 protected ChangeEvent event;
12 protected LinkedList listeners;
13
14 protected int currentValue = 0;
15
16 protected boolean adjusting = false;
17
18 protected int extent = 1;
19
20 public ListData()
21 {
22 event = new ChangeEvent(this);
23 listeners = new LinkedList();
24 }
25
26 public ListElement getElementAtLocation(int pixely)
27 {
28 int _height = (TextSource.fontMetrics.getHeight() + 2);
29
30 int lineNo = ((pixely - (pixely % _height)) / _height) + currentValue;
31
32 return getElementAt(lineNo);
33 }
34
35 public void dirty() { }
36
37 public abstract int getSize();
38
39 public abstract ListElement head();
40 public abstract ListElement next();
41
42 public abstract ListElement getElementAt(int number);
43 public abstract Iterator dataIterator();
44
45 public Object  getSynchronizationKeyOuter()
46 {
47 return null;
48 }
49
50 public Object getSynchronizationKeyInner()
51 {
52 return null;
53 }
54
55 public void fireChangeEvent()
56 {
57 ListIterator i = listeners.listIterator();
58 while (i.hasNext())
59 {
60 ChangeListener temp = (ChangeListener)i.next();
61 temp.stateChanged(event);
62 }
63 }
64
65 public void addChangeListener(ChangeListener x)
66 {
67 listeners.add(x);
68 }
69
70 public void removeChangeListener(ChangeListener x)
71 {
72 listeners.remove(x);
73 }
74
75 public int getExtent()
76 {
77 return extent;
78 }
79
80 public int getMaximum()
81 {
82 return getSize();
83 }
84
85 public int getMinimum()
86 {
87 return 0;
88 }
89
90 public int getValue()
91 {
92 if ( (currentValue + extent) > getSize() )
93 {
94 currentValue = getSize() - extent;
95 }
96
97 if (getSize() < extent)
98 {
99 currentValue = 0;
100 }
101
102 if (currentValue < getSize())
103 {
104 return currentValue;
105 }
106
107 currentValue = getSize() - 1;
108 return currentValue;
109 }
110
111 public boolean getValueIsAdjusting()
112 {
113 return adjusting;
114 }
115
116 public void setExtent(int x)
117 {
118 extent = x;
119 }
120
121 public void setMaximum(int x)
122 {
123 }
124
125 public void setMinimum(int x)
126 {
127 }
128
129 public void setRangeProperties(int newValue, int extent, int min, int max, boolean adjusting)
130 {
131 }
132
133 public void setValue (int newValue)
134 {
135 if (newValue < 0)
136 {
137 currentValue = 0;
138 }
139 else if (newValue < getSize())
140 {
141 currentValue = newValue;
142 }
143 else
144 {
145 currentValue = getSize() - 1;
146 }
147
148 fireChangeEvent();
149 }
150
151 public void setValueIsAdjusting(boolean b)
152 {
153 adjusting = b;
154 }
155 }
156
157
158 |
Popular Tags |
Java API By Example, From Geeks To Geeks.