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<TITLE>Listening for Approve and Cancel Events in a JFileChooser Dialog (Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h1>The Java Developers Almanac 1.4</h1>
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<A HREF="../javax.swing.filechooser/pkg.html">javax.swing.filechooser</A><font color="#666666" class="xsmall-font">
[19 examples]
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<B><A HREF="../javax.swing.filechooser/pkg.html#Events">Events</A></B><font color="#666666" class="xsmall-font">
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<h3>e905. Listening for Approve and Cancel Events in a JFileChooser Dialog</h3>
When the user clicks on the approve button (Open or Save) or the
Cancel button, an action event is fired.
<P> Unfortunately, if the user clicks on the close-dialog icon in
the title bar, an event is not fired. In order to listen for this
event, it is necessary to add a window event listener to the dialog.
This means that <code>JFileChooser.showDialog()</code> cannot be used because it
creates the dialog internally. The workaround is to override the
<code>createDialog()</code> method to make it public and then call it to
create the dialog.
<P> With this deficiency, we recommend that you simply wait until
<code>showDialog()</code> returns and then use its return value. See
<a href="../javax.swing.filechooser/Done.html" class="eglink"><b>e890</b> Determining If the Approve or Cancel Button Was Clicked in a JFileChooser Dialog</a> for more information.
<pre> // Create customized chooser
MyFileChooser chooser = new MyFileChooser();
// Set dialog type if not OPEN_DIALOG
chooser.setDialogType(<font color="#0066ff"><i>JFileChooser.SAVE_DIALOG</i></font>);
// Create dialog containing the chooser
final JDialog dialog = chooser.createDialog(<font color="#0066ff"><i>frame</i></font>);
// Add listener for approve and cancel events
chooser.addActionListener(new AbstractAction() {
public void actionPerformed(ActionEvent evt) {
JFileChooser chooser = (JFileChooser)evt.getSource();
if (JFileChooser.APPROVE_SELECTION.equals(evt.getActionCommand())) {
// Open or Save was clicked
// Hide dialog
dialog.setVisible(false);
} else if (JFileChooser.CANCEL_SELECTION.equals(evt.getActionCommand())) {
// Cancel was clicked
// Hide dialog
dialog.setVisible(false);
}
}
});
// Add listener for window closing events
dialog.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
// Close-dialog icon was clicked
// Hide dialog
dialog.setVisible(false);
}
});
// Show the dialog; wait until dialog is closed
dialog.show();
// This version of JFileChooser simply makes createDialog a public method.
public class MyFileChooser extends JFileChooser {
public JDialog createDialog(Component parent) throws HeadlessException {
return super.createDialog(parent);
}
}
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<b>Related Examples</b></font></td>
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e903. <a class="eglink" href="ChgEvent.html?l=rel">
Listening for Changes to the Selected File in a JFileChooser Dialog
</a>
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e904. <a class="eglink" href="DirEvent.html?l=rel">
Listening for Changes to the Current Directory in a JFileChooser Dialog
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See also:
<a class="eglink" href="/egs/javax.swing.filechooser/pkg.html?l=rel#Hidden%20Files">
Hidden Files
</a>
<a class="eglink" href="/egs/javax.swing.filechooser/pkg.html?l=rel#Icons">
Icons
</a>
<a class="eglink" href="/egs/javax.swing.filechooser/pkg.html?l=rel#Layout">
Layout
</a>
<a class="eglink" href="/egs/javax.swing.filechooser/pkg.html?l=rel#Selections">
Selections
</a>
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