select all on focus in lots of jTextField

RYN picture RYN · Sep 9, 2011 · Viewed 10.2k times · Source

I have lots of jTextFields in my application (About 34 jTextFields) and I want all of them select all of their text when get focus and select none of text on focus lost.
Is there any way to do this with one listener or should I write a "FocusGained" and a "FocusLost" for each of these 34 jTextFields?

Thanks

Answer

dacwe picture dacwe · Sep 9, 2011

Create a class for this task:

static class FocusTextField extends JTextField {
    {
        addFocusListener(new FocusListener() {

            @Override
            public void focusGained(FocusEvent e) {
                FocusTextField.this.select(0, getText().length());
            }

            @Override
            public void focusLost(FocusEvent e) {
                FocusTextField.this.select(0, 0);
            }
        });
    }
}

Example usage (code below):

screenshot

public static void main(String[] args) throws Exception {

    JFrame frame = new JFrame("Test");
    frame.setLayout(new GridLayout(5, 1));

    frame.add(new FocusTextField());
    frame.add(new FocusTextField());
    frame.add(new FocusTextField());
    frame.add(new FocusTextField());
    frame.add(new FocusTextField());

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
}