Move cursor of JTextField or JComboBox to the start

Question

I have a JTextField with some text. When I click text field the cursor moves to the end of field. I want the cursor to move to the start of the field when it becomes focused.

I have the same problem with an editable JComboBox.

How can I achieve this cursor positioning on focus?

Answer 1

/**
* On gaining focus place the cursor at the start of the text.
*/
public class CursorAtStartFocusListener extends FocusAdapter {

    @Override
    public void focusGained(java.awt.event.FocusEvent evt) {
        Object source = evt.getSource();
        if (source instanceof JTextComponent) {
            JTextComponent comp = (JTextComponent) source;
            comp.setCaretPosition(0);
        } else {
            Logger.getLogger(getClass().getName()).log(Level.INFO,
                    "A text component expected instead of {0}",
                    source.getClass().getName());
        }
    }
}

jTextField1.addFocusListener(new CursorAtStartFocusListener());
jComboBox1.getEditor().getEditorComponent().addFocusListener(new CursorAtStartFocusListener());
// Only one instance of CursorAtStartFocusListener needed.

Answer 2

You can use this command

comp.setCaretPosition(index);

there index is caret position.