[Chapter 21] AdjustmentEvent

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| Chapter 21 java.awt.event Reference |

# AdjustmentEvent

## Name

AdjustmentEvent

##

## Description

`AdjustmentEvent`s are generated by objects that implement the `Adjustable` interface. `Scrollbar` is one example of such an object.

## Class Definition

    public class java.awt.event.AdjustmentEvent
       extends java.awt.AWTEvent {
      // Constants
      public final static int ADJUSTMENT_FIRST;
      public final static int ADJUSTMENT_LAST;
      public final static int ADJUSTMENT_VALUE_CHANGED;
      public final static int BLOCK_DECREMENT;
      public final static int BLOCK_INCREMENT;
      public final static int TRACK;
      public final static int UNIT_DECREMENT;
      public final static int UNIT_INCREMENT;
      // Constructors
      public AdjustmentEvent (Adjustable source, int id, int type, int value);
      // Instance Methods
      public Adjustable getAdjustable();
      public int getAdjustmentType();
      public int getValue();
      public String paramString();
    }

## Constants

### ADJUSTMENT_FIRST

#### public final static int ADJUSTMENT_FIRST

Specifies the beginning range of adjustment event ID values.

### ADJUSTMENT_LAST

#### public final static int ADJUSTMENT_LAST

Specifies the ending range of adjustment event ID values.

### ADJUSTMENT_VALUE_CHANGED

#### public final static int ADJUSTMENT_VALUE_CHANGED

Event type ID for value changed.

### BLOCK_DECREMENT

#### public final static int BLOCK_DECREMENT

Adjustment type for block decrement.

### BLOCK_INCREMENT

#### public final static int BLOCK_INCREMENT

Adjustment type for block increment.

### TRACK

#### public final static int TRACK

Adjustment type for tracking.

### UNIT_DECREMENT

#### public final static int UNIT_DECREMENT

Adjustment type for unit decrement.

### UNIT_INCREMENT

#### public final static int UNIT_INCREMENT

Adjustment type for unit increment.

## Constructors

### AdjustmentEvent

#### public AdjustmentEvent (Adjustable source, int id, int type, int value)

Parameters

  source

    The object that generated the event.

  id

    The event type ID of the event.

  type

    The type of adjustment event.

  value

    The value of the `Adjustable` object.

Description

  Constructs an `AdjustmentEvent` with the given characteristics.

## Instance Methods

### getAdjustable

#### public Adjustable getAdjustable()

Returns

  The source of this event.

### getAdjustmentType

#### public int getAdjustmentType()

Returns

  One of the adjustment type constants.

Description

  The type will be `BLOCK_DECREMENT`, `BLOCK_INCREMENT`, `TRACK`, `UNIT_DECREMENT`, or `UNIT_INCREMENT`.

### getValue

#### public int getValue()

Returns

  The new value of the `Adjustable` object.

### paramString

#### public String paramString()

Returns

  String with current settings of the `AdjustmentEvent`.

Overrides

  `AWTEvent``.paramString()`

Description

  Helper method for `toString()` to generate string of current settings.

## See Also

`Adjustable`, `AdjustmentListener`, `AWTEvent`, `Scrollbar`

ActionListener |  | AdjustmentListener