How to listen to user actions in child class from parent class?

Question

Hi,
I have a basic custom class ChildCustomForm that include a JTextField. In order to know what user types, I add a listener to
this textbox:
textField.addKeyListener( new KeyAdapter()
            @Override
            public void keyPressed( final KeyEvent e )
                //user typed something
                userTyped = true;
         });Now I have another parent class that uses ChildCustomForm, and parent class has to know once user types, then set
its own userTyped flag.
My problem is: since I added listener in child class, I cannot get textfield and add listener again in parent class, so parent class will not be able to know as soon as user types (polling is not a good solution here).
I am wondering if there is a way to do this?
regards,

Answer 1

jack_wns wrote:
I have a basic custom class ChildCustomForm that include a JTextField. In order to know what user types, I add a listener to
this textbox:You want to listen for input into the textbox, correct? This may take the form of keyboard input, or could be a paste-text event in which case your keylistener will miss it. I recommend that you look into a DocumentListener here so you will catch any changes, be they keyboard or cut or paste.
My problem is: since I added listener in child class, I cannot get textfield and add listener again in parent class, so parent class will not be able to know as soon as user types (polling is not a good solution here).The observer pattern may work here.