TextEvent.java

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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.awt.event;

import java.awt.AWTEvent;

/**
 * A semantic event which indicates that an object's text changed.
 * This high-level event is generated by an object (such as a TextComponent)
 * when its text changes. The event is passed to
 * every <code>TextListener</code> object which registered to receive such
 * events using the component's <code>addTextListener</code> method.
 * <P>
 * The object that implements the <code>TextListener</code> interface gets
 * this <code>TextEvent</code> when the event occurs. The listener is
 * spared the details of processing individual mouse movements and key strokes
 * Instead, it can process a "meaningful" (semantic) event like "text changed".
 * <p>
 * An unspecified behavior will be caused if the {@code id} parameter
 * of any particular {@code TextEvent} instance is not
 * in the range from {@code TEXT_FIRST} to {@code TEXT_LAST}.
 *
 * @author Georges Saab
 *
 * @see java.awt.TextComponent
 * @see TextListener
 *
 * @since 1.1
 */

public class TextEvent extends AWTEvent {

    /**
     * The first number in the range of ids used for text events.
     */
    public static final int TEXT_FIRST  = 900;

    /**
     * The last number in the range of ids used for text events.
     */
    public static final int TEXT_LAST   = 900;

    /**
     * This event id indicates that object's text changed.
     */
    public static final int TEXT_VALUE_CHANGED  = TEXT_FIRST;

    /*
     * JDK 1.1 serialVersionUID
     */
    private static final long serialVersionUID = 6269902291250941179L;

    /**
     * Constructs a <code>TextEvent</code> object.
     * <p> This method throws an
     * <code>IllegalArgumentException</code> if <code>source</code>
     * is <code>null</code>.
     *
     * @param source The (<code>TextComponent</code>) object that
     *               originated the event
     * @param id     An integer that identifies the event type.
     *                     For information on allowable values, see
     *                     the class description for {@link TextEvent}
     * @throws IllegalArgumentException if <code>source</code> is null
     * @see #getSource()
     * @see #getID()
     */
    public TextEvent(Object source, int id) {
        super(source, id);
    }


    /**
     * Returns a parameter string identifying this text event.
     * This method is useful for event-logging and for debugging.
     *
     * @return a string identifying the event and its attributes
     */
    public String paramString() {
        String typeStr;
        switch(id) {
          case TEXT_VALUE_CHANGED:
              typeStr = "TEXT_VALUE_CHANGED";
              break;
          default:
              typeStr = "unknown type";
        }
        return typeStr;
    }
}