Adds a listener to the window parent of the given component. - Java Swing

Java examples for Swing:JComponent

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Description

Adds a listener to the window parent of the given component.

Demo Code


//package com.java2s;

import java.awt.Component;

import java.awt.Window;

import java.awt.event.HierarchyEvent;
import java.awt.event.HierarchyListener;

import java.awt.event.WindowListener;

import javax.swing.SwingUtilities;

public class Main {
    /**/*  w ww  .  j a va2 s.  co m*/
     * Adds a listener to the window parent of the given component. Can be
     * called before the component is added to its hierachy.
     */
    public static void addWindowListener(final Component source,
            final WindowListener listener) {
        if (source instanceof Window) {
            ((Window) source).addWindowListener(listener);
        } else {
            source.addHierarchyListener(new HierarchyListener() {

                @Override
                public void hierarchyChanged(HierarchyEvent e) {
                    if ((e.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) == HierarchyEvent.SHOWING_CHANGED) {
                        SwingUtilities.getWindowAncestor(source)
                                .addWindowListener(listener);
                    }
                }
            });
        }
    }
}

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