cursor.java

《移动Agent技术》一书的所有章节源代码。

/*
 * @(#)Cursor.java	1.5 97/01/27
 * 
 * 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;


/**
 * A class to encapsulate the bitmap representation of the mouse cursor.
 *
 * @see Component#setCursor
 * @version 	1.5, 01/27/97
 * @author 	Amy Fowler
 */
public class Cursor implements java.io.Serializable {

    /**
     * The default cursor type (gets set if no cursor is defined).
     */
    public static final int	DEFAULT_CURSOR   		= 0;

    /**
     * The crosshair cursor type.
     */
    public static final int	CROSSHAIR_CURSOR 		= 1;

    /**
     * The text cursor type.
     */
    public static final int	TEXT_CURSOR 	 		= 2;

    /**
     * The wait cursor type.
     */
    public static final int	WAIT_CURSOR	 		= 3;

    /**
     * The south-west-resize cursor type.
     */
    public static final int	SW_RESIZE_CURSOR	 	= 4;

    /**
     * The south-east-resize cursor type.
     */
    public static final int	SE_RESIZE_CURSOR	 	= 5;

    /**
     * The north-west-resize cursor type.
     */
    public static final int	NW_RESIZE_CURSOR		= 6;

    /**
     * The north-east-resize cursor type.
     */
    public static final int	NE_RESIZE_CURSOR	 	= 7;

    /**
     * The north-resize cursor type.
     */
    public static final int	N_RESIZE_CURSOR 		= 8;

    /**
     * The south-resize cursor type.
     */
    public static final int	S_RESIZE_CURSOR 		= 9;

    /**
     * The west-resize cursor type.
     */
    public static final int	W_RESIZE_CURSOR	 		= 10;

    /**
     * The east-resize cursor type.
     */
    public static final int	E_RESIZE_CURSOR			= 11;

    /**
     * The hand cursor type.
     */
    public static final int	HAND_CURSOR			= 12;

    /**
     * The move cursor type.
     */
    public static final int	MOVE_CURSOR			= 13;

    protected static Cursor predefined[] = new Cursor[14];

    int type = DEFAULT_CURSOR;

     /*
      * JDK 1.1 serialVersionUID 
      */
     private static final long serialVersionUID = 8028237497568985504L;

    /**
     * Returns a cursor object with the specified predefined type.
     * @param type the type of predefined cursor
     */
    static public Cursor getPredefinedCursor(int type) {
	if (type < Cursor.DEFAULT_CURSOR || type > Cursor.MOVE_CURSOR) {
	    throw new IllegalArgumentException("illegal cursor type");
	}
	if (predefined[type] == null) {
	    predefined[type] = new Cursor(type);
	}
	return predefined[type];
    }

    /**
     * Return the system default cursor.
     */
    static public Cursor getDefaultCursor() {
        return getPredefinedCursor(Cursor.DEFAULT_CURSOR);
    }

    /**
     * Creates a new cursor object with the specified type.
     * @param type the type of cursor
     */
    public Cursor(int type) {
	if (type < Cursor.DEFAULT_CURSOR || type > Cursor.MOVE_CURSOR) {
	    throw new IllegalArgumentException("illegal cursor type");
	}
	this.type = type;
    }

    /**
     * Returns the type for this cursor.
     */
    public int getType() {
	return type;
    }	
    
}