java.awt.event.ComponentListener Maven / Gradle / Ivy

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*/


  


package java.awt.event;

import java.util.EventListener;

/** 
 * The listener interface for receiving component events.
 * The class that is interested in processing a component event
 * either implements this interface (and all the methods it
 * contains) or extends the abstract ComponentAdapter class
 * (overriding only the methods of interest).
 * The listener object created from that class is then registered with a
 * component using the component's addComponentListener 
 * method. When the component's size, location, or visibility
 * changes, the relevant method in the listener object is invoked,
 * and the ComponentEvent is passed to it.
 * 
 * Component events are provided for notification purposes ONLY;
 * The AWT will automatically handle component moves and resizes
 * internally so that GUI layout works properly regardless of
 * whether a program registers a ComponentListener or not.
 *
 * @see ComponentAdapter
 * @see ComponentEvent
 * @see Tutorial: Writing a Component Listener
 * @see Reference: The Java Class Libraries (update file)
 *
 * @author Carl Quinn
 * @version 1.15 01/23/03
 * @since 1.1
 */
public interface ComponentListener extends EventListener
{

    /** 
     * Invoked when the component's size changes.
     */
    public void componentResized(ComponentEvent e);

    /** 
     * Invoked when the component's position changes.
     */
    public void componentMoved(ComponentEvent e);

    /** 
     * Invoked when the component has been made visible.
     */
    public void componentShown(ComponentEvent e);

    /** 
     * Invoked when the component has been made invisible.
     */
    public void componentHidden(ComponentEvent e);
}