ActionDemopublic class ActionDemo extends JFrame
| Fields Summary |
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| protected JTextArea | textArea | | protected String | newline | | protected Action | leftAction | | protected Action | middleAction | | protected Action | rightAction |
| Constructors Summary |
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public ActionDemo()
//Do frame stuff.
super("ActionDemo");
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
//Create the toolbar and menu.
JToolBar toolBar = new JToolBar();
JMenu mainMenu = new JMenu("Menu");
createActionComponents(toolBar, mainMenu);
//Create the text area used for output.
textArea = new JTextArea(5, 30);
JScrollPane scrollPane = new JScrollPane(textArea);
//Lay out the content pane.
JPanel contentPane = new JPanel();
contentPane.setLayout(new BorderLayout());
contentPane.setPreferredSize(new Dimension(400, 150));
contentPane.add(toolBar, BorderLayout.SOUTH);
contentPane.add(scrollPane, BorderLayout.CENTER);
setContentPane(contentPane);
//Set up the menu bar.
JMenuBar mb = new JMenuBar();
mb.add(mainMenu);
mb.add(createAbleMenu());
setJMenuBar(mb);
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| Methods Summary |
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| protected javax.swing.JMenu | createAbleMenu()
JMenu ableMenu = new JMenu("Action State");
JCheckBoxMenuItem cbmi = null;
cbmi = new JCheckBoxMenuItem("First action enabled");
cbmi.setSelected(true);
cbmi.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
JCheckBoxMenuItem mi = (JCheckBoxMenuItem)(e.getSource());
boolean selected =
(e.getStateChange() == ItemEvent.SELECTED);
leftAction.setEnabled(selected);
}
});
ableMenu.add(cbmi);
cbmi = new JCheckBoxMenuItem("Second action enabled");
cbmi.setSelected(true);
cbmi.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
JCheckBoxMenuItem mi = (JCheckBoxMenuItem)(e.getSource());
boolean selected =
(e.getStateChange() == ItemEvent.SELECTED);
middleAction.setEnabled(selected);
}
});
ableMenu.add(cbmi);
cbmi = new JCheckBoxMenuItem("Third action enabled");
cbmi.setSelected(true);
cbmi.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
JCheckBoxMenuItem mi =
(JCheckBoxMenuItem)(e.getSource());
boolean selected =
(e.getStateChange() == ItemEvent.SELECTED);
rightAction.setEnabled(selected);
}
});
ableMenu.add(cbmi);
return ableMenu;
| | protected void | createActionComponents(javax.swing.JToolBar toolBar, javax.swing.JMenu mainMenu)
JButton button = null;
JMenuItem menuItem = null;
//first button and menu item
leftAction = new AbstractAction("Go left",
new ImageIcon("images/left.gif")) {
public void actionPerformed(ActionEvent e) {
displayResult("Action for first button/menu item", e);
}
};
button = toolBar.add(leftAction);
button.setText(""); //an icon-only button
button.setToolTipText("This is the left button");
menuItem = mainMenu.add(leftAction);
menuItem.setIcon(null); //arbitrarily chose not to use icon in menu
//second button and menu item
middleAction = new AbstractAction("Do something",
new ImageIcon("images/middle.gif")) {
public void actionPerformed(ActionEvent e) {
displayResult("Action for second button/menu item", e);
}
};
button = toolBar.add(middleAction);
button.setText("");
button.setToolTipText("This is the middle button");
menuItem = mainMenu.add(middleAction);
menuItem.setIcon(null); //arbitrarily chose not to use icon in menu
//third button and menu item
rightAction = new AbstractAction("Go right",
new ImageIcon("images/right.gif")) {
public void actionPerformed(ActionEvent e) {
displayResult("Action for third button/menu item", e);
}
};
button = toolBar.add(rightAction);
button.setText("");
button.setToolTipText("This is the right button");
menuItem = mainMenu.add(rightAction);
menuItem.setIcon(null); //arbitrarily chose not to use icon in menu
| | protected void | displayResult(java.lang.String actionDescription, java.awt.event.ActionEvent e)
String s = ("Action event detected by: "
+ actionDescription
+ newline
+ " Event source: " + e.getSource()
+ newline);
textArea.append(s);
| | public static void | main(java.lang.String[] args)
ActionDemo frame = new ActionDemo();
frame.pack();
frame.setVisible(true);
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