JSpinner ActionListener alternative

Question

In my program, I want to use a JSpinner for a number. This number will later be used to calculate something. Every time the user clicks one of the spinner buttons (up or down), I want the result to update automatically. Since you can't add an ActionListener to a JSpinner (which I think is really weird), I am asking here how to do something similar to this (I already have an ActionListener ready for this, which can be changed in any other listener of course).

Houdon

Your answer might be this post: https://mcmap.net/q/1326859/-java-mouseevents-not-working – Selfdriven

Answer 1

You could add a ChangeListener to the spinner. This will be triggered by the button presses (or a direct edit of the field).

spinner.addChangeListener(new ChangeListener() {      
  @Override
  public void stateChanged(ChangeEvent e) {
    // handle click
  }
});

Seagoing

Answer 2

Every time the user clicks one of the spinner button (up or down), I want the result to update automatically.

Add a DocumentListener to the Document of the text field that is being used as the editor of the spinner.

Edit:

JSpinner.DefaultEditor editor = (JSpinner.DefaultEditor)number.getEditor();
JTextField textField = editor.getTextField();
textField.getDocument().addDocumentListener( new DocumentListener()
{
    public void insertUpdate(DocumentEvent e)
    {
        System.out.println("insert");
    }

    public void removeUpdate(DocumentEvent e)
    {
        System.out.println("remove");
    }

    public void changedUpdate(DocumentEvent e) {}
});

Deadeye

Like this? ((JSpinner.DefaultEditor)spinner.getEditor()).getTextField().getDocument().addDocumentListener(new DocumentListener() {...} It doesn't seem to work... – Houdon

@Creator13, yes, that is the general code. Works fine for me. Although the ChangeListener is the way to go. – Deadeye

Answer 3

This is the only way I've found:

for (Component c : mySpinner.getComponents()) {
    if (c instanceof JButton) {
        ((JButton) c).addActionListener(...);
    }
    if (c instanceof JSpinner.DefaultEditor) {
        ((JSpinner.DefaultEditor) c).getTextField().addActionListener(...);
    }
}

Bullington