[Chapter 19] Adjustable
Author: John Zukowski
Date: Thu Jul 31 15:09:17 1997

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| Chapter 19 java.awt Reference |

# Adjustable

## Name

Adjustable

##

## Description

The `Adjustable` interface is useful for scrollbars, sliders, dials, and other components that have an adjustable numeric value. Classes that implement the `Adjustable` interface should send `AdjustmentEvent` objects to listeners that have registered via `addAdjustmentListener(AdjustmentListener)`.

## Interface Definition

    public abstract interface java.awt.Adjustable {
      // Constants
      public final static int HORIZONTAL = 0;
      public final static int VERTICAL = 1;

      // Interface Methods
      public abstract void addAdjustmentListener (AdjustmentListener l);
      public abstract int getBlockIncrement();
      public abstract int getMaximum();
      public abstract int getMinimum();
      public abstract int getOrientation();
      public abstract int getUnitIncrement();
      public abstract int getValue();
      public abstract int getVisibleAmount();
      public abstract void removeAdjustmentListener (AdjustmentListener l);
      public abstract void setBlockIncrement (int b);
      public abstract void setMaximum (int max);
      public abstract void setMinimum (int min);
      public abstract void setUnitIncrement (int u);
      public abstract void setValue (int v);
      public abstract void setVisibleAmount (int v);
    }

## Constants

### HORIZONTAL

#### public static final int HORIZONTAL

A constant representing horizontal orientation.

### VERTICAL

#### public static final int VERTICAL

A constant representing vertical orientation.

## Interface Methods

### addAdjustmentListener

#### public abstract void addAdjustmentListener (ActionListener l)

Parameters

  l

    An object that implements the `AdjustmentListener` interface.

Description

  Add a listener for adjustment event.

### getBlockIncrement

#### public abstract int getBlockIncrement()

Returns

  The amount to scroll when a paging area is selected.

### getMaximum

#### public abstract int getMaximum()

Returns

  The maximum value that the `Adjustable` object can take.

### getMinimum

#### public abstract int getMinimum()

Returns

  The minimum value that the `Adjustable` object can take.

### getOrientation

#### public abstract int getOrientation()

Returns

  A value representing the direction of the `Adjustable` object.

### getUnitIncrement

#### public abstract int getUnitIncrement()

Returns

  The unit amount to scroll.

### getValue

#### public abstract int getValue()

Returns

  The current setting for the `Adjustable` object.

### getVisibleAmount

#### public abstract int getVisibleAmount()

Returns

  The current visible setting (i.e., size) for the `Adjustable` object.

### removeAdjustmentListener

#### public abstract void removeAdjustmentListener (AdjustmentListener l)

Parameters

  l

    One of the object's `AdjustmentListener`s.

Description

  Remove an adjustment event listener.

### setBlockIncrement

#### public abstract void setBlockIncrement (int b)

Parameters

  b

    New block increment amount.

Description

  Changes the block increment amount for the `Adjustable` object.

### setMaximum

#### public abstract void setMaximum (int max)

Parameters

  max

    New maximum value.

Description

  Changes the maximum value for the `Adjustable` object.

### setMinimum

#### public abstract void setMinimum (int min)

Parameters

  min

    New minimum value.

Description

  Changes the minimum value for the `Adjustable` object.

### setUnitIncrement

#### public abstract void setUnitIncrement (int u)

Parameters

  u

    New unit increment amount.

Description

  Changes the unit increment amount for the `Adjustable` object.

### setValue

#### public abstract void setValue (int v)

Parameters

  v

    New value.

Description

  Changes the current value of the `Adjustable` object.

### setVisibleAmount

#### public abstract void setVisibleAmount (int v)

Parameters

  v

    New amount visible.

Description

  Changes the current visible amount of the `Adjustable` object.

## See Also

`AdjustmentEvent`, `AdjustmentListener`, `Scrollbar`

AWTException |  | BorderLayout