JList中使用JCheckBox示例

package JList;

/**
CheckBoxList
*/
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.ListSelectionModel;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;

public class MyJList extends JFrame {

protected JList m_list;
protected JLabel m_total;

public MyJList() {
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 MyJList();
}
}

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 MyJList m_parent;
protected JList m_list;

public CheckListener(MyJList 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();
}
}

public 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)";
}
}

评论

1 楼 lamar511 2012-05-15  

very good and thanks a lot.