在JList里加CHECKBOX
在JList里加CHECKBOX 问题点数：100、回复次数：1Top
1 楼disk（晚上看太阳,我靠怎想的，做梦去吧^_&）回复于 2002-11-22 13:54:56 得分 100
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
public class CheckBoxList
extends JFrame
{
protected JList m_list;
protected JLabel m_total;
public CheckBoxList()
{
super("Swing List [Check boxes]");
setSize(260, 240);
getContentPane().setLayout(new FlowLayout());
InstallData[] options = {
new InstallData("Program executable", 118),
new InstallData("Help files", 52),
new InstallData("Tools and converters", 83),
new InstallData("Source code", 133)
};
m_list = new JList(options);
CheckListCellRenderer renderer = new CheckListCellRenderer();
m_list.setCellRenderer(renderer);
m_list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
CheckListener lst = new CheckListener(this);
m_list.addMouseListener(lst);
m_list.addKeyListener(lst);
JScrollPane ps = new JScrollPane();
ps.getViewport().add(m_list);
m_total = new JLabel("Space required: 0K");
JPanel p = new JPanel();
p.setLayout(new BorderLayout());
p.add(ps, BorderLayout.CENTER);
p.add(m_total, BorderLayout.SOUTH);
p.setBorder(new TitledBorder(new EtchedBorder(),
"Please select options:") );
getContentPane().add(p);
WindowListener wndCloser = new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
};
addWindowListener(wndCloser);
setVisible(true);
recalcTotal();
}
public void recalcTotal()
{
ListModel model = m_list.getModel();
int total = 0;
for (int k=0; k<model.getSize(); k++)
{
InstallData data = (InstallData)model.getElementAt(k);
if (data.isSelected())
total += data.getSize();
}
m_total.setText("Space required: "+total+"K");
}
public static void main(String argv[])
{
new CheckBoxList();
}
}
class CheckListCellRenderer
extends JCheckBox
implements ListCellRenderer
{
protected static Border m_noFocusBorder =
new EmptyBorder(1, 1, 1, 1);
public CheckListCellRenderer()
{
super();
setOpaque(true);
setBorder(m_noFocusBorder);
}
public Component getListCellRendererComponent(JList list,
Object value, int index, boolean isSelected, boolean cellHasFocus)
{
setText(value.toString());
setBackground(isSelected ? list.getSelectionBackground() :
list.getBackground());
setForeground(isSelected ? list.getSelectionForeground() :
list.getForeground());
InstallData data = (InstallData)value;
setSelected(data.isSelected());
setFont(list.getFont());
setBorder((cellHasFocus) ?
UIManager.getBorder("List.focusCellHighlightBorder")
: m_noFocusBorder);
return this;
}
}
class CheckListener
implements MouseListener, KeyListener
{
protected CheckBoxList m_parent;
protected JList m_list;
public CheckListener(CheckBoxList parent)
{
m_parent = parent;
m_list = parent.m_list;
}
public void mouseClicked(MouseEvent e)
{
if (e.getX() < 20)
doCheck();
}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void keyPressed(KeyEvent e)
{
if (e.getKeyChar() == ' ')
doCheck();
}
public void keyTyped(KeyEvent e) {}
public void keyReleased(KeyEvent e) {}
protected void doCheck()
{
int index = m_list.getSelectedIndex();
if (index < 0)
return;
InstallData data = (InstallData)m_list.getModel().
getElementAt(index);
data.invertSelected();
m_list.repaint();
m_parent.recalcTotal();
}
}
class InstallData
{
protected String m_name;
protected int m_size;
protected boolean m_selected;
public InstallData(String name, int size)
{
m_name = name;
m_size = size;
m_selected = false;
}
public String getName() { return m_name; }
public int getSize() { return m_size; }
public void setSelected(boolean selected) { m_selected = selected;}
public void invertSelected() { m_selected = !m_selected; }
public boolean isSelected() { return m_selected; }
public String toString() { return m_name+" ("+m_size+" K)"; }
}
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