add Key Listener To All Component - Java Swing

Java examples for Swing:Key Event

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Description

add Key Listener To All Component

Demo Code


//package com.java2s;
import java.awt.Component;
import java.awt.Container;
import java.awt.event.KeyListener;

import javax.swing.AbstractButton;
import javax.swing.JComponent;

public class Main {
    public static void addKeyListenerToAll(Component parent,
            KeyListener listener) {
        if (parent instanceof AbstractButton) {
            AbstractButton a = (AbstractButton) parent;
            // Check If The Listener is Already There (Avoid Double Reactions)
            boolean is = false;
            KeyListener[] kl = a.getKeyListeners();
            for (KeyListener k : kl) {
                if (k.equals(listener)) {
                    is = true;/*from  w ww . j  a  va 2 s.c o  m*/
                    break;
                }
            }
            if (!is)
                a.addKeyListener(listener);
        }

        else if (parent instanceof JComponent) {
            JComponent a = (JComponent) parent;
            // Check If The Listener is Already There (Avoid Double Reactions)
            boolean is = false;
            KeyListener[] kl = a.getKeyListeners();
            for (KeyListener k : kl) {
                if (k.equals(listener)) {
                    is = true;
                    break;
                }
            }
            if (!is)
                a.addKeyListener(listener);
        }

        if (parent instanceof Container) {
            Component[] comps = ((Container) parent).getComponents();
            for (Component c : comps) {
                addKeyListenerToAll(c, listener);
            }
        }
    }
}

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