Class AdjustmentEvent

java.lang.Object

java.util.EventObject

java.awt.AWTEvent

java.awt.event.AdjustmentEvent

All Implemented Interfaces:

Serializable

public class AdjustmentEvent
extends AWTEvent

The adjustment event emitted by Adjustable objects like Scrollbar and ScrollPane. When the user changes the value of the scrolling component, it receives an instance of AdjustmentEvent.

An unspecified behavior will be caused if the id parameter of any particular AdjustmentEvent instance is not in the range from ADJUSTMENT_FIRST to ADJUSTMENT_LAST.

The type of any AdjustmentEvent instance takes one of the following values:

• UNIT_INCREMENT
• UNIT_DECREMENT
• BLOCK_INCREMENT
• BLOCK_DECREMENT
• TRACK

Assigning the value different from listed above will cause an unspecified behavior.

Since:

1.1

See Also:

• Adjustable
• AdjustmentListener
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ADJUSTMENT_FIRST	Marks the first integer id for the range of adjustment event ids.
static final int	ADJUSTMENT_LAST	Marks the last integer id for the range of adjustment event ids.
static final int	ADJUSTMENT_VALUE_CHANGED	The adjustment value changed event.
static final int	BLOCK_DECREMENT	The block decrement adjustment type.
static final int	BLOCK_INCREMENT	The block increment adjustment type.
static final int	TRACK	The absolute tracking adjustment type.
static final int	UNIT_DECREMENT	The unit decrement adjustment type.
static final int	UNIT_INCREMENT	The unit increment adjustment type.

Fields declared in class AWTEvent

ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK

Modifier and Type	Field	Description
static final long	ACTION_EVENT_MASK	The event mask for selecting action events.
static final long	ADJUSTMENT_EVENT_MASK	The event mask for selecting adjustment events.
static final long	COMPONENT_EVENT_MASK	The event mask for selecting component events.
protected boolean	consumed	Controls whether or not the event is sent back down to the peer once the source has processed it - false means it's sent to the peer; true means it's not.
static final long	CONTAINER_EVENT_MASK	The event mask for selecting container events.
static final long	FOCUS_EVENT_MASK	The event mask for selecting focus events.
static final long	HIERARCHY_BOUNDS_EVENT_MASK	The event mask for selecting hierarchy bounds events.
static final long	HIERARCHY_EVENT_MASK	The event mask for selecting hierarchy events.
protected int	id	The event's id.
static final long	INPUT_METHOD_EVENT_MASK	The event mask for selecting input method events.
static final long	INVOCATION_EVENT_MASK	The event mask for selecting invocation events.
static final long	ITEM_EVENT_MASK	The event mask for selecting item events.
static final long	KEY_EVENT_MASK	The event mask for selecting key events.
static final long	MOUSE_EVENT_MASK	The event mask for selecting mouse events.
static final long	MOUSE_MOTION_EVENT_MASK	The event mask for selecting mouse motion events.
static final long	MOUSE_WHEEL_EVENT_MASK	The event mask for selecting mouse wheel events.
static final long	PAINT_EVENT_MASK	The event mask for selecting paint events.
static final int	RESERVED_ID_MAX	The maximum value for reserved AWT event IDs.
static final long	TEXT_EVENT_MASK	The event mask for selecting text events.
static final long	WINDOW_EVENT_MASK	The event mask for selecting window events.
static final long	WINDOW_FOCUS_EVENT_MASK	The event mask for selecting window focus events.
static final long	WINDOW_STATE_EVENT_MASK	The event mask for selecting window state events.

Fields declared in class EventObject

source

Modifier and Type	Field	Description
protected Object	source	The object on which the Event initially occurred.

Constructor Summary

Constructors

Constructor	Description
AdjustmentEvent(Adjustable source, int id, int type, int value)	Constructs an AdjustmentEvent object with the specified Adjustable source, event type, adjustment type, and value.
AdjustmentEvent(Adjustable source, int id, int type, int value, boolean isAdjusting)	Constructs an AdjustmentEvent object with the specified Adjustable source, event type, adjustment type, and value.

Method Summary

Modifier and Type	Method	Description
Adjustable	getAdjustable()	Returns the Adjustable object where this event originated.
int	getAdjustmentType()	Returns the type of adjustment which caused the value changed event.
int	getValue()	Returns the current value in the adjustment event.
boolean	getValueIsAdjusting()	Returns true if this is one of multiple adjustment events.

Methods declared in class AWTEvent

consume, getID, isConsumed, paramString, setSource, toString

Modifier and Type	Method	Description
protected void	consume()	Consumes this event, if this event can be consumed.
int	getID()	Returns the event type.
protected boolean	isConsumed()	Returns whether this event has been consumed.
String	paramString()	Returns a string representing the state of this Event.
void	setSource(Object newSource)	Retargets an event to a new source.
String	toString()	Returns a String representation of this object.

Methods declared in class EventObject

getSource

Modifier and Type	Method	Description
Object	getSource()	The object on which the Event initially occurred.

Methods declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Field Details

ADJUSTMENT_FIRST

public static final int ADJUSTMENT_FIRST

Marks the first integer id for the range of adjustment event ids.

See Also:

• Constant Field Values

ADJUSTMENT_LAST

public static final int ADJUSTMENT_LAST

Marks the last integer id for the range of adjustment event ids.

See Also:

• Constant Field Values

ADJUSTMENT_VALUE_CHANGED

public static final int ADJUSTMENT_VALUE_CHANGED

The adjustment value changed event.

See Also:

• Constant Field Values

UNIT_INCREMENT

@Native
public static final int UNIT_INCREMENT

The unit increment adjustment type.

See Also:

• Constant Field Values

UNIT_DECREMENT

@Native
public static final int UNIT_DECREMENT

The unit decrement adjustment type.

See Also:

• Constant Field Values

BLOCK_DECREMENT

@Native
public static final int BLOCK_DECREMENT

The block decrement adjustment type.

See Also:

• Constant Field Values

BLOCK_INCREMENT

@Native
public static final int BLOCK_INCREMENT

The block increment adjustment type.

See Also:

• Constant Field Values

TRACK

@Native
public static final int TRACK

The absolute tracking adjustment type.

See Also:

• Constant Field Values

Constructor Details

AdjustmentEvent

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

Constructs an AdjustmentEvent object with the specified Adjustable source, event type, adjustment type, and value.

This method throws an IllegalArgumentException if source is null.

Parameters:

source - The Adjustable object where the event originated

id - An integer indicating the type of event. For information on allowable values, see the class description for AdjustmentEvent

type - An integer indicating the adjustment type. For information on allowable values, see the class description for AdjustmentEvent

value - The current value of the adjustment

Throws:

IllegalArgumentException - if source is null

See Also:

• EventObject.getSource()
• AWTEvent.getID()
• getAdjustmentType()
• getValue()

AdjustmentEvent

public AdjustmentEvent(Adjustable source,
 int id,
 int type,
 int value,
 boolean isAdjusting)

Constructs an AdjustmentEvent object with the specified Adjustable source, event type, adjustment type, and value.

This method throws an IllegalArgumentException if source is null.

Parameters:

source - The Adjustable object where the event originated

id - An integer indicating the type of event. For information on allowable values, see the class description for AdjustmentEvent

type - An integer indicating the adjustment type. For information on allowable values, see the class description for AdjustmentEvent

value - The current value of the adjustment

isAdjusting - A boolean that equals true if the event is one of a series of multiple adjusting events, otherwise false

Throws:

IllegalArgumentException - if source is null

Since:

1.4

See Also:

• EventObject.getSource()
• AWTEvent.getID()
• getAdjustmentType()
• getValue()
• getValueIsAdjusting()

Method Details

getAdjustable

public Adjustable getAdjustable()

Returns the Adjustable object where this event originated.

Returns:

the Adjustable object where this event originated

getValue

public int getValue()

Returns the current value in the adjustment event.

Returns:

the current value in the adjustment event

getAdjustmentType

public int getAdjustmentType()

Returns the type of adjustment which caused the value changed event. It will have one of the following values:

• UNIT_INCREMENT
• UNIT_DECREMENT
• BLOCK_INCREMENT
• BLOCK_DECREMENT
• TRACK

Returns:

one of the adjustment values listed above

getValueIsAdjusting

public boolean getValueIsAdjusting()

Returns true if this is one of multiple adjustment events.

Returns:

true if this is one of multiple adjustment events, otherwise returns false

Since:

1.4