ListDialogpublic class ListDialog extends JDialog Use this modal dialog to let the user choose one string from a long
list. See the main method for an example of using ListDialog. The
basics:
String[] choices = {"A", "long", "array", "of", "strings"};
ListDialog.initialize(componentInControllingFrame, choices,
"Dialog Title",
"A description of the list:");
String selectedName = ListDialog.showDialog(locatorComponent,
initialSelection);
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| Fields Summary |
|---|
| private static ListDialog | dialog | | private static String | value | | private JList | list |
| Constructors Summary |
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private ListDialog(Frame frame, Object[] data, String title, String labelText)
super(frame, title, true);
//buttons
JButton cancelButton = new JButton("Cancel");
final JButton setButton = new JButton("Set");
cancelButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ListDialog.dialog.setVisible(false);
}
});
setButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ListDialog.value = (String)(list.getSelectedValue());
ListDialog.dialog.setVisible(false);
}
});
getRootPane().setDefaultButton(setButton);
//main part of the dialog
list = new JList(data);
list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
list.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
setButton.doClick();
}
}
});
JScrollPane listScroller = new JScrollPane(list);
listScroller.setPreferredSize(new Dimension(250, 80));
//XXX: Must do the following, too, or else the scroller thinks
//XXX: it's taller than it is:
listScroller.setMinimumSize(new Dimension(250, 80));
listScroller.setAlignmentX(LEFT_ALIGNMENT);
//Create a container so that we can add a title around
//the scroll pane. Can't add a title directly to the
//scroll pane because its background would be white.
//Lay out the label and scroll pane from top to button.
JPanel listPane = new JPanel();
listPane.setLayout(new BoxLayout(listPane, BoxLayout.Y_AXIS));
JLabel label = new JLabel(labelText);
label.setLabelFor(list);
listPane.add(label);
listPane.add(Box.createRigidArea(new Dimension(0,5)));
listPane.add(listScroller);
listPane.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
//Lay out the buttons from left to right.
JPanel buttonPane = new JPanel();
buttonPane.setLayout(new BoxLayout(buttonPane, BoxLayout.X_AXIS));
buttonPane.setBorder(BorderFactory.createEmptyBorder(0, 10, 10, 10));
buttonPane.add(Box.createHorizontalGlue());
buttonPane.add(cancelButton);
buttonPane.add(Box.createRigidArea(new Dimension(10, 0)));
buttonPane.add(setButton);
//Put everything together, using the content pane's BorderLayout.
Container contentPane = getContentPane();
contentPane.add(listPane, BorderLayout.CENTER);
contentPane.add(buttonPane, BorderLayout.SOUTH);
pack();
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| Methods Summary |
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| public static void | initialize(java.awt.Component comp, java.lang.String[] possibleValues, java.lang.String title, java.lang.String labelText)Set up the dialog. The first argument can be null,
but it really should be a component in the dialog's
controlling frame.
Frame frame = JOptionPane.getFrameForComponent(comp);
dialog = new ListDialog(frame, possibleValues,
title, labelText);
| | public static void | main(java.lang.String[] args)This is here so that you can view ListDialog even if you
haven't written the code to include it in a program.
String[] names = {"Arlo", "Cosmo", "Elmo", "Hugo",
"Jethro", "Laszlo", "Milo", "Nemo",
"Otto", "Ringo", "Rocco", "Rollo"};
JFrame f = new JFrame("Name That Baby");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JLabel intro = new JLabel("The chosen name:");
final JLabel name = new JLabel("Cosmo");
intro.setLabelFor(name);
name.setForeground(Color.black);
JButton button = new JButton("Pick a new name...");
ListDialog.initialize(f, names, "Name Chooser",
"Baby names ending in O:");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String selectedName = ListDialog.showDialog(null,
name.getText());
name.setText(selectedName);
}
});
JPanel contentPane = new JPanel();
f.setContentPane(contentPane);
contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
contentPane.setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
contentPane.add(intro);
contentPane.add(name);
contentPane.add(Box.createRigidArea(new Dimension(0,10)));
contentPane.add(button);
intro.setAlignmentX(JComponent.CENTER_ALIGNMENT);
name.setAlignmentX(JComponent.CENTER_ALIGNMENT);
button.setAlignmentX(JComponent.CENTER_ALIGNMENT);
f.pack();
f.setVisible(true);
| | private void | setValue(java.lang.String newValue)
value = newValue;
list.setSelectedValue(value, true);
| | public static java.lang.String | showDialog(java.awt.Component comp, java.lang.String initialValue)Show the initialized dialog. The first argument should
be null if you want the dialog to come up in the center
of the screen. Otherwise, the argument should be the
component on top of which the dialog should appear.
if (dialog != null) {
dialog.setValue(initialValue);
dialog.setLocationRelativeTo(comp);
dialog.setVisible(true);
} else {
System.err.println("ListDialog requires you to call initialize "
+ "before calling showDialog.");
}
return value;
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