/*
 * @(#)AdjustmentEvent.java	1.21 00/02/02
 *
 * Copyright 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

package java.awt.event;

import java.awt.Adjustable;
import java.awt.AWTEvent;
import java.awt.Event;

/**
 * The adjustment event emitted by Adjustable objects.
 * @see java.awt.Adjustable
 * @see AdjustmentListener
 *
 * @author Amy Fowler
 * @version 1.21 02/02/00
 * @since 1.1
 */
public class AdjustmentEvent extends AWTEvent {

    /**
     * Marks the first integer id for the range of adjustment event ids.
     */
    public static final int ADJUSTMENT_FIRST 	= 601;

    /**
     * Marks the last integer id for the range of adjustment event ids.
     */
    public static final int ADJUSTMENT_LAST 	= 601;

    /**
     * The adjustment value changed event.
     */
    public static final int ADJUSTMENT_VALUE_CHANGED = ADJUSTMENT_FIRST; //Event.SCROLL_LINE_UP

    /**
     * The unit increment adjustment type.
     */
    public static final int UNIT_INCREMENT	= 1;

    /**
     * The unit decrement adjustment type.
     */
    public static final int UNIT_DECREMENT	= 2;

    /**
     * The block decrement adjustment type.
     */
    public static final int BLOCK_DECREMENT     = 3;

    /**
     * The block increment adjustment type.
     */
    public static final int BLOCK_INCREMENT     = 4;

    /**
     * The absolute tracking adjustment type.
     */
    public static final int TRACK	        = 5;

    /**
     * The adjustable object that fired the event.
     *
     * @serial
     * @see getAdjustable()
     */
    Adjustable adjustable;

    /**
     * <code>value</code> will contain the new value of the
     * adjustable object.  This value will always be  in a
     * range associated adjustable object.
     *
     * @serial
     * @see getValue()
     */
    int value;

    /**
     * The <code>adjustmentType</code> describes how the adjustable
     * object value has changed.
     * This value can be increased/decreased by a block or unit amount
     * where the block is associated with page increments/decrements,
     * and a unit is associated with line increments/decrements.
     *
     * @serial
     * @see getAdjustmentType()
     */
    int adjustmentType;

    /*
     * JDK 1.1 serialVersionUID 
     */
     private static final long serialVersionUID = 5700290645205279921L;

    /**
     * Constructs a AdjustmentEvent object with the specified Adjustable 
     * source, event type, adjustment type, and value.
     * type, and value.
     * @param source the Adjustable object where the event originated
     * @param id     the event type
     * @param type   the adjustment type 
     * @param value  the current value of the adjustment
     */
    public AdjustmentEvent(Adjustable source, int id, int type, int value) {
        super(source, id);
	adjustable = source;
        this.adjustmentType = type;
	this.value = value;
    }

    /**
     * Returns the Adjustable object where this event originated.
     */
    public Adjustable getAdjustable() {
        return adjustable;
    }

    /**
     * Returns the current value in the adjustment event.
     */
    public int getValue() {
        return value;
    }

    /**
     * Returns the type of adjustment which caused the value changed
     * event.
     * @see #UNIT_INCREMENT
     * @see #UNIT_DECREMENT
     * @see #BLOCK_INCREMENT
     * @see #BLOCK_DECREMENT
     * @see #TRACK
     */
    public int getAdjustmentType() {
        return adjustmentType;
    }

    public String paramString() {
        String typeStr;
        switch(id) {
          case ADJUSTMENT_VALUE_CHANGED:
              typeStr = "ADJUSTMENT_VALUE_CHANGED";
              break;
          default:
              typeStr = "unknown type";
        }
        String adjTypeStr;
        switch(adjustmentType) {
          case UNIT_INCREMENT:
              adjTypeStr = "UNIT_INCREMENT";
              break;
          case UNIT_DECREMENT:
              adjTypeStr = "UNIT_DECREMENT";
              break;
          case BLOCK_INCREMENT:
              adjTypeStr = "BLOCK_INCREMENT";
              break;
          case BLOCK_DECREMENT:
              adjTypeStr = "BLOCK_DECREMENT";
              break;
          case TRACK:
              adjTypeStr = "TRACK";
              break;
          default:
              adjTypeStr = "unknown type";
        }
        return typeStr + ",adjType="+adjTypeStr + ",value="+value;
    }
}