实现一个定制的组合框编辑器.txt

javaswing实现一个指定的组合框编辑器

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*; 
public class Test extends JApplet {
private JComboBox comboBox = 
new JComboBox(new Object[] {
new Item(new Object[] {Color.gray, "gray"}),
new Item(new Object[] {Color.orange, "orange"}),
new Item(new Object[] {Color.red, "red"}),
new Item(new Object[] {Color.blue, "blue"}),
new Item(new Object[] {Color.yellow, "yellow"}),
new Item(new Object[] {Color.magenta, "magenta"}),
new Item(new Object[] {Color.black, "black"}),
new Item(new Object[] {Color.green, "green"}),
new Item(new Object[] {Color.lightGray, "lightGray"}),
new Item(new Object[] {Color.white, "white"}),
});

public void init() {
Container contentPane = getContentPane();

comboBox.setRenderer(new ColorRendererer());
comboBox.setEditor(new ColorComboBoxEditor());
comboBox.setEditable(true);

contentPane.setLayout(new FlowLayout());
contentPane.add(comboBox);
}
}
class Item {
private Color color;
private String string;

public Item(Object[] array) {
color = (Color)array[0];
string = (String)array[1];
}
public Color getColor() { return color; }
public String toString() { return string; }
}
class ColorComboBoxEditor extends AbstractComboBoxEditor {
ColorIcon editorIcon = new ColorIcon();
JLabel editorLabel = new JLabel(editorIcon);

Item item;

JColorChooser colorChooser = new JColorChooser();
ActionListener okListener = new OKListener();
Dialog dialog = JColorChooser.createDialog(
null, // parentComponent
"Choose A Color",// title
true, // modal
colorChooser,
okListener, 
null); // cancel listener

public ColorComboBoxEditor() {
editorLabel.setBorder(BorderFactory.createEtchedBorder());

editorLabel.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
dialog.setVisible(true);
}
});
}
class OKListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
item = 
new Item(new Object[] {
colorChooser.getColor(), null});

fireActionPerformed(e);
}
}
public Component getEditorComponent() {
return editorLabel;
}
public Object getItem() {
return item;
}
public void setItem(Object itemToSet) {
item = (Item)itemToSet;

// cannot set the selected item in an editor's
// setItem method, or an infinite loop results

editorIcon.setColor(item.getColor());
editorLabel.setText(item.toString());
}
public void selectAll() {
// from ComboBoxModel interface: nothing to select 
}
}
abstract class AbstractComboBoxEditor implements ComboBoxEditor {
EventListenerList listenerList = new EventListenerList();

public void addActionListener(ActionListener listener) {
listenerList.add(ActionListener.class, listener);
}
public void removeActionListener(ActionListener listener) {
listenerList.remove(ActionListener.class, listener);
}
protected void fireActionPerformed(ActionEvent e) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();

// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==ActionListener.class) {
((ActionListener)
listeners[i+1]).actionPerformed(e);
} 
}
} 
}
class ColorRendererer extends JLabel implements ListCellRenderer {
private ColorIcon icon = new ColorIcon();

public ColorRendererer() {
setOpaque(true);
setIcon(icon);
}
public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
Item item = (Item)value;

icon.setColor(item.getColor());
setText(item.toString());

if(isSelected) {
setForeground(list.getSelectionForeground());
setBackground(list.getSelectionBackground());
}
else {
setForeground(list.getForeground());
setBackground(list.getBackground());
}
return this;
}
}
class ColorIcon implements Icon {
private Color color;
private int w, h;

public ColorIcon() {
this(Color.gray, 50, 15);
}
public ColorIcon(Color color, int w, int h) {
this.color = color;
this.w = w;
this.h = h;
}
public void paintIcon(Component c, Graphics g, int x, int y) {
g.setColor(Color.black);
g.drawRect(x, y, w-1, h-1);
g.setColor(color);
g.fillRect(x+1, y+1, w-2, h-2);
}
public Color getColor() {
return color;
}
public void setColor(Color color) {
this.color = color;
}
public int getIconWidth() {
return w;
}
public int getIconHeight() {
return h;
}
}