靠，没有人回答，这是我从网上找到的例子，贴上来给大家参考： import javax.swing.*; import javax.swing.event.ChangeListener; import javax.swing.plaf.ActionMapUIResource; import java.awt.event.*;/** * Maintenance tip - There were some tricks to getting this code * working: * * 1. You have to overwite addMouseListener() to do nothing * 2. You have to add a mouse event on mousePressed by calling * super.addMouseListener() * 3. You have to replace the UIActionMap for the keyboard event * "pressed" with your own one. * 4. You have to remove the UIActionMap for the keyboard event * "released". * 5. You have to grab focus when the next state is entered, * otherwise clicking on the component won't get the focus. * 6. You have to make a TristateDecorator as a button model that * wraps the original button model and does state management. */ public class TristateCheckBox extends JCheckBox { /** This is a type-safe enumerated type */ public static class State { private State() { } } public static final State NOT_SELECTED = new State(); public static final State SELECTED = new State(); public static final State DONT_CARE = new State(); private final TristateDecorator model; public TristateCheckBox(String text, Icon icon, State initial){ super(text, icon); // Add a listener for when the mouse is pressed super.addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent e) { grabFocus(); model.nextState(); } }); // Reset the keyboard action map ActionMap map = new ActionMapUIResource(); map.put("pressed", new AbstractAction() { public void actionPerformed(ActionEvent e) { grabFocus(); model.nextState(); } }); map.put("released", null); SwingUtilities.replaceUIActionMap(this, map); // set the model to the adapted model model = new TristateDecorator(getModel()); setModel(model); setState(initial); } public TristateCheckBox(String text, State initial) { this(text, null, initial); } public TristateCheckBox(String text) { this(text, DONT_CARE); } public TristateCheckBox() { this(null); } /** No one may add mouse listeners, not even Swing! */ public void addMouseListener(MouseListener l) { } /** * Set the new state to either SELECTED, NOT_SELECTED or * DONT_CARE. If state == null, it is treated as DONT_CARE. */ public void setState(State state) { model.setState(state); } /** Return the current state, which is determined by the * selection status of the model. */ public State getState() { return model.getState(); } public void setSelected(boolean b) { if (b) { setState(SELECTED); } else { setState(NOT_SELECTED); } } /** * Exactly which Design Pattern is this? Is it an Adapter, * a Proxy or a Decorator? In this case, my vote lies with the * Decorator, because we are extending functionality and * "decorating" the original model with a more powerful model. */ private class TristateDecorator implements ButtonModel { private final ButtonModel other; private TristateDecorator(ButtonModel other) { this.other = other; } private void setState(State state) { if (state == NOT_SELECTED) { other.setArmed(false); setPressed(false); setSelected(false); } else if (state == SELECTED) { other.setArmed(false); setPressed(false); setSelected(true); } else { // either "null" or DONT_CARE other.setArmed(true); setPressed(true); setSelected(true); } } /** * The current state is embedded in the selection / armed * state of the model. * * We return the SELECTED state when the checkbox is selected * but not armed, DONT_CARE state when the checkbox is * selected and armed (grey) and NOT_SELECTED when the * checkbox is deselected. */ private State getState() { if (isSelected() && !isArmed()) { // normal black tick return SELECTED; } else if (isSelected() && isArmed()) { // don't care grey tick return DONT_CARE; } else { // normal deselected return NOT_SELECTED; } } /** We rotate between NOT_SELECTED, SELECTED and DONT_CARE.*/ private void nextState() { State current = getState(); if (current == NOT_SELECTED) { setState(SELECTED); } else if (current == SELECTED) { setState(DONT_CARE); } else if (current == DONT_CARE) { setState(NOT_SELECTED); } } /** Filter: No one may change the armed status except us. */ public void setArmed(boolean b) { } /** We disable focusing on the component when it is not * enabled. */ public void setEnabled(boolean b) { setFocusable(b); other.setEnabled(b); } /** All these methods simply delegate to the "other" model * that is being decorated. */ public boolean isArmed() { return other.isArmed(); } public boolean isSelected() { return other.isSelected(); } public boolean isEnabled() { return other.isEnabled(); } public boolean isPressed() { return other.isPressed(); } public boolean isRollover() { return other.isRollover(); } public void setSelected(boolean b) { other.setSelected(b); } public void setPressed(boolean b) { other.setPressed(b); } public void setRollover(boolean b) { other.setRollover(b); } public void setMnemonic(int key) { other.setMnemonic(key); } public int getMnemonic() { return other.getMnemonic(); } public void setActionCommand(String s) { other.setActionCommand(s); } public String getActionCommand() { return other.getActionCommand(); } public void setGroup(ButtonGroup group) { other.setGroup(group); } public void addActionListener(ActionListener l) { other.addActionListener(l); } public void removeActionListener(ActionListener l) { other.removeActionListener(l); } public void addItemListener(ItemListener l) { other.addItemListener(l); } public void removeItemListener(ItemListener l) { other.removeItemListener(l); } public void addChangeListener(ChangeListener l) { other.addChangeListener(l); } public void removeChangeListener(ChangeListener l) { other.removeChangeListener(l); } public Object[] getSelectedObjects() { return other.getSelectedObjects(); } } }
Here is some sample code that uses the TristateCheckBox: import javax.swing.*; import java.awt.*;public class TristateCheckBoxTest { public static void main(String args[]) throws Exception { JFrame frame = new JFrame("TristateCheckBoxTest"); frame.getContentPane().setLayout(new GridLayout(0, 1, 5, 5)); final TristateCheckBox swingBox = new TristateCheckBox( "Testing the tristate checkbox"); swingBox.setMnemonic('T'); frame.getContentPane().add(swingBox); frame.getContentPane().add(new JCheckBox( "The normal checkbox")); UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName()); final TristateCheckBox winBox = new TristateCheckBox( "Testing the tristate checkbox", TristateCheckBox.SELECTED); frame.getContentPane().add(winBox); final JCheckBox winNormal = new JCheckBox( "The normal checkbox"); frame.getContentPane().add(winNormal); // wait for 3 seconds, then enable all check boxes new Thread() { {start();} public void run() { try { winBox.setEnabled(false); winNormal.setEnabled(false); Thread.sleep(3000); winBox.setEnabled(true); winNormal.setEnabled(true); } catch (InterruptedException ex) { } } }; frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.show(); } }原贴地址在：http://cretesoft.com/archive/newsletter.do?issue=082
import javax.swing.*;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.ActionMapUIResource;
import java.awt.event.*;/**
* Maintenance tip - There were some tricks to getting this code
* working:
*
* 1. You have to overwite addMouseListener() to do nothing
* 2. You have to add a mouse event on mousePressed by calling
* super.addMouseListener()
* 3. You have to replace the UIActionMap for the keyboard event
* "pressed" with your own one.
* 4. You have to remove the UIActionMap for the keyboard event
* "released".
* 5. You have to grab focus when the next state is entered,
* otherwise clicking on the component won't get the focus.
* 6. You have to make a TristateDecorator as a button model that
* wraps the original button model and does state management.
*/
public class TristateCheckBox extends JCheckBox {
/** This is a type-safe enumerated type */
public static class State { private State() { } }
public static final State NOT_SELECTED = new State();
public static final State SELECTED = new State();
public static final State DONT_CARE = new State(); private final TristateDecorator model; public TristateCheckBox(String text, Icon icon, State initial){
super(text, icon);
// Add a listener for when the mouse is pressed
super.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
grabFocus();
model.nextState();
}
});
// Reset the keyboard action map
ActionMap map = new ActionMapUIResource();
map.put("pressed", new AbstractAction() {
public void actionPerformed(ActionEvent e) {
grabFocus();
model.nextState();
}
});
map.put("released", null);
SwingUtilities.replaceUIActionMap(this, map);
// set the model to the adapted model
model = new TristateDecorator(getModel());
setModel(model);
setState(initial);
}
public TristateCheckBox(String text, State initial) {
this(text, null, initial);
}
public TristateCheckBox(String text) {
this(text, DONT_CARE);
}
public TristateCheckBox() {
this(null);
} /** No one may add mouse listeners, not even Swing! */
public void addMouseListener(MouseListener l) { }
/**
* Set the new state to either SELECTED, NOT_SELECTED or
* DONT_CARE. If state == null, it is treated as DONT_CARE.
*/
public void setState(State state) { model.setState(state); }
/** Return the current state, which is determined by the
* selection status of the model. */
public State getState() { return model.getState(); }
public void setSelected(boolean b) {
if (b) {
setState(SELECTED);
} else {
setState(NOT_SELECTED);
}
}
/**
* Exactly which Design Pattern is this? Is it an Adapter,
* a Proxy or a Decorator? In this case, my vote lies with the
* Decorator, because we are extending functionality and
* "decorating" the original model with a more powerful model.
*/
private class TristateDecorator implements ButtonModel {
private final ButtonModel other;
private TristateDecorator(ButtonModel other) {
this.other = other;
}
private void setState(State state) {
if (state == NOT_SELECTED) {
other.setArmed(false);
setPressed(false);
setSelected(false);
} else if (state == SELECTED) {
other.setArmed(false);
setPressed(false);
setSelected(true);
} else { // either "null" or DONT_CARE
other.setArmed(true);
setPressed(true);
setSelected(true);
}
}
/**
* The current state is embedded in the selection / armed
* state of the model.
*
* We return the SELECTED state when the checkbox is selected
* but not armed, DONT_CARE state when the checkbox is
* selected and armed (grey) and NOT_SELECTED when the
* checkbox is deselected.
*/
private State getState() {
if (isSelected() && !isArmed()) {
// normal black tick
return SELECTED;
} else if (isSelected() && isArmed()) {
// don't care grey tick
return DONT_CARE;
} else {
// normal deselected
return NOT_SELECTED;
}
}
/** We rotate between NOT_SELECTED, SELECTED and DONT_CARE.*/
private void nextState() {
State current = getState();
if (current == NOT_SELECTED) {
setState(SELECTED);
} else if (current == SELECTED) {
setState(DONT_CARE);
} else if (current == DONT_CARE) {
setState(NOT_SELECTED);
}
}
/** Filter: No one may change the armed status except us. */
public void setArmed(boolean b) {
}
/** We disable focusing on the component when it is not
* enabled. */
public void setEnabled(boolean b) {
setFocusable(b);
other.setEnabled(b);
}
/** All these methods simply delegate to the "other" model
* that is being decorated. */
public boolean isArmed() { return other.isArmed(); }
public boolean isSelected() { return other.isSelected(); }
public boolean isEnabled() { return other.isEnabled(); }
public boolean isPressed() { return other.isPressed(); }
public boolean isRollover() { return other.isRollover(); }
public void setSelected(boolean b) { other.setSelected(b); }
public void setPressed(boolean b) { other.setPressed(b); }
public void setRollover(boolean b) { other.setRollover(b); }
public void setMnemonic(int key) { other.setMnemonic(key); }
public int getMnemonic() { return other.getMnemonic(); }
public void setActionCommand(String s) {
other.setActionCommand(s);
}
public String getActionCommand() {
return other.getActionCommand();
}
public void setGroup(ButtonGroup group) {
other.setGroup(group);
}
public void addActionListener(ActionListener l) {
other.addActionListener(l);
}
public void removeActionListener(ActionListener l) {
other.removeActionListener(l);
}
public void addItemListener(ItemListener l) {
other.addItemListener(l);
}
public void removeItemListener(ItemListener l) {
other.removeItemListener(l);
}
public void addChangeListener(ChangeListener l) {
other.addChangeListener(l);
}
public void removeChangeListener(ChangeListener l) {
other.removeChangeListener(l);
}
public Object[] getSelectedObjects() {
return other.getSelectedObjects();
}
}
}
import java.awt.*;public class TristateCheckBoxTest {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame("TristateCheckBoxTest");
frame.getContentPane().setLayout(new GridLayout(0, 1, 5, 5));
final TristateCheckBox swingBox = new TristateCheckBox(
"Testing the tristate checkbox");
swingBox.setMnemonic('T');
frame.getContentPane().add(swingBox);
frame.getContentPane().add(new JCheckBox(
"The normal checkbox"));
UIManager.setLookAndFeel(
UIManager.getSystemLookAndFeelClassName());
final TristateCheckBox winBox = new TristateCheckBox(
"Testing the tristate checkbox",
TristateCheckBox.SELECTED);
frame.getContentPane().add(winBox);
final JCheckBox winNormal = new JCheckBox(
"The normal checkbox");
frame.getContentPane().add(winNormal);
// wait for 3 seconds, then enable all check boxes
new Thread() { {start();}
public void run() {
try {
winBox.setEnabled(false);
winNormal.setEnabled(false);
Thread.sleep(3000);
winBox.setEnabled(true);
winNormal.setEnabled(true);
} catch (InterruptedException ex) { }
}
};
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.show();
}
}原贴地址在：http://cretesoft.com/archive/newsletter.do?issue=082