paintevent.java

《移动Agent技术》一书的所有章节源代码。

/*
 * @(#)PaintEvent.java	1.6 97/02/20
 * 
 * Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 * 
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 * 
 * CopyrightVersion 1.1_beta
 * 
 */

package java.awt.event;

import java.awt.Component;
import java.awt.Event;
import java.awt.Rectangle;

/**
 * The component-level paint event.
 * This event is a special type which is used to ensure that
 * paint/update method calls are serialized along with the other
 * events delivered from the event queue.  This event is not
 * designed to be used with the Event Listener model; programs
 * should continue to override paint/update methods in order
 * render themselves properly.
 *
 * @version 1.6 02/20/97
 * @author Amy Fowler
 */
public class PaintEvent extends ComponentEvent {

    /**
     * Marks the first integer id for the range of paint event ids.
     */    
    public static final int PAINT_FIRST		= 800;

    /**
     * Marks the last integer id for the range of paint event ids.
     */
    public static final int PAINT_LAST		= 801;

    /**
     * The paint event type.  
     */
    public static final int PAINT = PAINT_FIRST;

    /**
     * The update event type.  
     */
    public static final int UPDATE = PAINT_FIRST + 1; //801

    Rectangle updateRect;

    /*
     * JDK 1.1 serialVersionUID 
     */
    private static final long serialVersionUID = 1267492026433337593L;

    /**
     * Constructs a PaintEvent object with the specified source component
     * and type.
     * @param source the object where the event originated
     * @id the event type
     * @updateRect the rectangle area which needs to be repainted
     */
    public PaintEvent(Component source, int id, Rectangle updateRect) {
        super(source, id);
        this.updateRect = updateRect;
    }

    /**
     * Returns the rectangle representing the area which needs to be
     * repainted in response to this event.
     */
    public Rectangle getUpdateRect() {
        return updateRect;
    }

    /**
     * Sets the rectangle representing the area which needs to be
     * repainted in response to this event.
     * @param updateRect the rectangle area which needs to be repainted
     */
    public void setUpdateRect(Rectangle updateRect) {
        this.updateRect = updateRect;
    }

    public String paramString() {
        String typeStr;
        switch(id) {
          case PAINT:
              typeStr = "PAINT";
              break;
          case UPDATE:
              typeStr = "UPDATE";
              break;
          default:
              typeStr = "unknown type";
        }
        return typeStr + ",updateRect="+(updateRect != null ? updateRect.toString() : "null");
    }
}