/*
* @(#)CommandMenu.java
*
* Project: JHotdraw - a GUI framework for technical drawings
* http://www.jhotdraw.org
* http://jhotdraw.sourceforge.net
* Copyright: (c) by the original author(s) and all contributors
* License: Lesser GNU Public License (LGPL)
* http://www.opensource.org/licenses/lgpl-license.html
*/
package org.jhotdraw.util;
import org.jhotdraw.framework.JHotDrawRuntimeException;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.*;
/**
* A Command enabled menu. Selecting a menu item
* executes the corresponding command.
*
* @see Command
*
* @version <$CURRENT_VERSION$>
*/
public class CommandMenu extends JMenu implements ActionListener, CommandListener {
private HashMap hm;
public CommandMenu(String name) {
super(name);
hm = new HashMap();
}
/**
* Adds a command to the menu. The item's label is
* the command's name.
*/
public synchronized void add(Command command) {
addMenuItem(command, new JMenuItem(command.name()));
}
/**
* Adds a command with the given short cut to the menu. The item's label is
* the command's name.
*/
public synchronized void add(Command command, MenuShortcut shortcut) {
addMenuItem(command, new JMenuItem(command.name(), shortcut.getKey()));
}
/**
* Adds a command with the given short cut to the menu. The item's label is
* the command's name.
*/
public synchronized void addCheckItem(Command command) {
addMenuItem(command, new JCheckBoxMenuItem(command.name()));
}
protected void addMenuItem(Command command, JMenuItem m) {
m.setName(command.name());
m.addActionListener(this);
add(m);
command.addCommandListener(this);
hm.put(m, command);
// checkEnabled();
}
public synchronized void remove(Command command) {
throw new JHotDrawRuntimeException("not implemented");
}
public synchronized void remove(MenuItem item) {
throw new JHotDrawRuntimeException("not implemented");
}
/**
* Changes the enabling/disabling state of a named menu item.
*/
public synchronized void enable(String name, boolean state) {
for (int i = 0; i < getItemCount(); i++) {
JMenuItem item = getItem(i);
if (name.equals(item.getText())) {
item.setEnabled(state);
return;
}
}
}
public synchronized void checkEnabled() {
// ignore separators (a separator has a hyphen as its label)
for (int i = 0; i < getMenuComponentCount(); i++) {
Component c = getMenuComponent(i);
Command cmd = (Command) hm.get(c);
if (cmd != null) {
c.setEnabled(cmd.isExecutable());
}
}
}
/**
* Executes the command.
*/
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
for (int i = 0; i < getItemCount(); i++) {
JMenuItem item = getItem(i);
// ignore separators (a separator has a hyphen as its label)
if (source == item) {
Command cmd = (Command) hm.get(item);
if (cmd != null) {
cmd.execute();
}
break;
}
}
}
public void commandExecuted(EventObject commandEvent) {
// checkEnabled();
}
public void commandExecutable(EventObject commandEvent) {
// checkEnabled();
}
public void commandNotExecutable(EventObject commandEvent) {
// checkEnabled();
}
}