JPanel Action Listener

Question

I have a JPanel with a bunch of different check boxes and text fields, I have a button that\'s disabled, and needs to be enabled when specific configurations are setup. What

Answer 1

You need to create custom component listener. Look here:

Create a custom event in Java

Creating Custom Listeners In Java

http://www.javaworld.com/article/2077333/core-java/mr-happy-object-teaches-custom-events.html

I do it throw the standard ActionListener Example

public class MyPanel extends JPanel {
  private final  JComboBox combo1;
  private final JButton btn2;

  .......
   //catch the actions of inside components
   btn2.addActionListener(new MyPanelComponentsActionListener());
  ........

   //assign actionlistener to panel class
    public void addActionListener(ActionListener l) {
        listenerList.add(ActionListener.class, l);
    }
    public void removeActionListener(ActionListener l) {
        listenerList.remove(ActionListener.class, l);
    }

    //handle registered listeners from components used MyPanel class
   protected void fireActionPerformed(ActionEvent event) {
    // Guaranteed to return a non-null array
    Object[] listeners = listenerList.getListenerList();
    ActionEvent e = null;
    // Process the listeners last to first, notifying
    // those that are interested in this event
    for (int i = listeners.length-2; i>=0; i-=2) {
        if (listeners[i]==ActionListener.class) {
            // Lazily create the event:
            if (e == null) {
                  String actionCommand = event.getActionCommand();
                  if(actionCommand == null) {
                     actionCommand = "FontChanged";
                  }
                  e = new ActionEvent(FontChooserPanel.this,
                                      ActionEvent.ACTION_PERFORMED,
                                      actionCommand,
                                      event.getWhen(),
                                      event.getModifiers());
             }
                 // here registered listener executing
                ((ActionListener)listeners[i+1]).actionPerformed(e); 
            }
        }
    }

//!!! here your event generator
    class MyPanelComponentsActionListener implements ActionListener  {
     public void actionPerformed(ActionEvent e) {
        //do something usefull
        //.....
        fireActionPerformed(e); 
      }
     }
....
}