DefaultListSelectionModel.java [plain text]
package javax.swing;
import javax.swing.event.*;
import java.util.*;
public class DefaultListSelectionModel implements ListSelectionModel
{
int mode = SINGLE_SELECTION;
Vector sel = new Vector();
Vector listeners;
Vector get_listeners()
{
if (listeners == null)
listeners = new Vector();
return listeners;
}
public void addListSelectionListener(ListSelectionListener listener)
{
get_listeners().addElement(listener);
}
public void removeListSelectionListener(ListSelectionListener listener)
{
get_listeners().removeElement(listener);
}
class Range
{
int i0, i1;
Range(int a, int b)
{
if (a > b)
{
i0 = b;
i1 = a;
}
else
{
i0 = a;
i1 = b;
}
}
}
public int getMinSelectionIndex()
{
if (isSelectionEmpty())
return -1;
boolean first = true;
int min = -1;
for (int i=0;i<sel.size();i++)
{
Range r = (Range) sel.get(i);
if (first)
{
min = r.i0;
first = false;
}
else
{
if (r.i0 > min)
{
min = r.i0;
}
}
}
return min;
}
public int getMaxSelectionIndex()
{
if (isSelectionEmpty())
return -1;
boolean first = true;
int max = -1;
for (int i=1;i<sel.size();i++)
{
Range r = (Range) sel.get(i);
if (first)
{
max = r.i1;
}
else
{
if (r.i1 > max)
{
max = r.i1;
}
}
}
return max;
}
public boolean isSelectedIndex(int a)
{
for (int i=0;i<sel.size();i++)
{
Range r = (Range) sel.get(i);
if (r.i0 <= a &&
r.i1 >= a)
{
return true;
}
}
return false;
}
public int getSelectionMode()
{ return mode; }
public void setSelectionMode(int a)
{ mode = a; }
boolean isSelectionEmpty()
{
return sel.size() == 0;
}
public void clearSelection()
{
sel.removeAllElements();
}
public void setSelectionInterval(int index0, int index1)
{
if (mode == SINGLE_SELECTION)
{
sel.removeAllElements();
}
sel.addElement(new Range(index0, index1));
}
}