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Java showInputDialog select custom text

I have rename dialog for rename file

String renameTo = JOptionPane.showInputDialog(gui, "New Name", currentFile.getName());


it works this way, but I have a problem.
the problem is that I set the default value with the extension of the file
but I just want the file name to be selected.

sample : my file name = yusuf.png


I want select only yusuf like;

JTextField

JOptionPane

JTextComponent#setSelectionStart

JTextComponent#setSelectionEnd

1 Answer
1

There is a lot going on inside JOptionPane, it's one of the things that makes it so powerful, it also makes it a little inflexible to.

JOptionPane

Two immediate problems are apparent...

JTextField

JOptionPane

Setting up the JTextField is actually straight forward...

JTextField

String text = "yusuf.png";
int endIndex = text.lastIndexOf(".");

JTextField field = new JTextField(text, 20);
if (endIndex > 0)
field.setSelectionStart(0);
field.setSelectionEnd(endIndex);
else
field.selectAll();



This will basically select all the text from the start of the String up to the last . or all the text if no . can be found.

String

.

.

The difficult part now is taking back focus control from the JOptionPane

JOptionPane

// Make a basic JOptionPane instance
JOptionPane pane = new JOptionPane(field,
JOptionPane.PLAIN_MESSAGE,
JOptionPane.OK_CANCEL_OPTION,
null);
// Use it's own dialog creation process, it's simpler this way
JDialog dialog = pane.createDialog("Rename");
// When the window is displayed, we want to "steal"
// focus from what the `JOptionPane` has set
// and apply it to our text field
dialog.addWindowListener(new WindowAdapter()
@Override
public void windowActivated(WindowEvent e)
// Set a small "delayed" action
// to occur at some point in the future...
// This way we can circumvent the JOptionPane's
// focus control
SwingUtilities.invokeLater(new Runnable()
@Override
public void run()
field.requestFocusInWindow();

);

);
// Put it on the screen...
dialog.setVisible(true);
dialog.dispose();
// Get the resulting action (what button was activated)
Object value = pane.getValue();
if (value instanceof Integer)
int result = (int)value;
// OK was actioned, get the new name
if (result == JOptionPane.OK_OPTION)
String newName = field.getText();
System.out.println("newName = " + newName);




And, crossing our fingers, we end up with something looking like...

Personally, I'd wrap this up in a nice reusable class/method call which returned the new text or null based on the action of the user, but that's me

null

Isn't there an easier way?

Of course, I just like showing you the most difficult solution possible ... 😳 (sarcasm) ... it's kind of why I suggested wrapping it up in it's own utility class, so you can re-use it later 😉

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