Class WindowEvent

java.lang.Object

java.util.EventObject

java.awt.AWTEvent

java.awt.event.ComponentEvent

java.awt.event.WindowEvent

All Implemented Interfaces:

Serializable

public class WindowEvent
extends ComponentEvent

A low-level event that indicates that a window has changed its status. This low-level event is generated by a Window object when it is opened, closed, activated, deactivated, iconified, or deiconified, or when focus is transferred into or out of the Window.

The event is passed to every WindowListener or WindowAdapter object which registered to receive such events using the window's addWindowListener method. (WindowAdapter objects implement the WindowListener interface.) Each such listener object gets this WindowEvent when the event occurs.

An unspecified behavior will be caused if the id parameter of any particular WindowEvent instance is not in the range from WINDOW_FIRST to WINDOW_LAST.

Since:

1.1

See Also:

• WindowAdapter
• WindowListener
• Tutorial: Writing a Window Listener
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final int	WINDOW_ACTIVATED	The window-activated event type.
static final int	WINDOW_CLOSED	The window closed event.
static final int	WINDOW_CLOSING	The "window is closing" event.
static final int	WINDOW_DEACTIVATED	The window-deactivated event type.
static final int	WINDOW_DEICONIFIED	The window deiconified event type.
static final int	WINDOW_FIRST	The first number in the range of ids used for window events.
static final int	WINDOW_GAINED_FOCUS	The window-gained-focus event type.
static final int	WINDOW_ICONIFIED	The window iconified event.
static final int	WINDOW_LAST	The last number in the range of ids used for window events.
static final int	WINDOW_LOST_FOCUS	The window-lost-focus event type.
static final int	WINDOW_OPENED	The window opened event.
static final int	WINDOW_STATE_CHANGED	The window-state-changed event type.

Fields declared in class ComponentEvent

COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN

Modifier and Type	Field	Description
static final int	COMPONENT_FIRST	The first number in the range of ids used for component events.
static final int	COMPONENT_HIDDEN	This event indicates that the component was rendered invisible.
static final int	COMPONENT_LAST	The last number in the range of ids used for component events.
static final int	COMPONENT_MOVED	This event indicates that the component's position changed.
static final int	COMPONENT_RESIZED	This event indicates that the component's size changed.
static final int	COMPONENT_SHOWN	This event indicates that the component was made visible.

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
WindowEvent(Window source, int id)	Constructs a WindowEvent object.
WindowEvent(Window source, int id, int oldState, int newState)	Constructs a WindowEvent object with the specified previous and new window states.
WindowEvent(Window source, int id, Window opposite)	Constructs a WindowEvent object with the specified opposite Window.
WindowEvent(Window source, int id, Window opposite, int oldState, int newState)	Constructs a WindowEvent object.

Method Summary

Modifier and Type	Method	Description
int	getNewState()	For WINDOW_STATE_CHANGED events returns the new state of the window.
int	getOldState()	For WINDOW_STATE_CHANGED events returns the previous state of the window.
Window	getOppositeWindow()	Returns the other Window involved in this focus or activation change.
Window	getWindow()	Returns the originator of the event.
String	paramString()	Returns a parameter string identifying this event.

Methods declared in class ComponentEvent

getComponent

Modifier and Type	Method	Description
Component	getComponent()	Returns the originator of the event.

Methods declared in class AWTEvent

consume, getID, isConsumed, 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.
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()	Creates and returns a copy of this object.
boolean	equals(Object obj)	Indicates whether some other object is "equal to" this one.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
final Class<?>	getClass()	Returns the runtime class of this Object.
int	hashCode()	Returns a hash code value for this object.
final void	notify()	Wakes up a single thread that is waiting on this object's monitor.
final void	notifyAll()	Wakes up all threads that are waiting on this object's monitor.
final void	wait()	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
final void	wait(long timeoutMillis)	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
final void	wait(long timeoutMillis, int nanos)	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

Field Details

WINDOW_FIRST

public static final int WINDOW_FIRST

The first number in the range of ids used for window events.

See Also:

• Constant Field Values

WINDOW_OPENED

@Native
public static final int WINDOW_OPENED

The window opened event. This event is delivered only the first time a window is made visible.

See Also:

• Constant Field Values

WINDOW_CLOSING

@Native
public static final int WINDOW_CLOSING

The "window is closing" event. This event is delivered when the user attempts to close the window from the window's system menu. If the program does not explicitly hide or dispose the window while processing this event, the window close operation will be cancelled.

See Also:

• Constant Field Values

WINDOW_CLOSED

@Native
public static final int WINDOW_CLOSED

The window closed event. This event is delivered after the displayable window has been closed as the result of a call to dispose.

See Also:

• Component.isDisplayable()
• Window.dispose()
• Constant Field Values

WINDOW_ICONIFIED

@Native
public static final int WINDOW_ICONIFIED

The window iconified event. This event is delivered when the window has been changed from a normal to a minimized state. For many platforms, a minimized window is displayed as the icon specified in the window's iconImage property.

See Also:

• Window.setIconImage(Image)
• Constant Field Values

WINDOW_DEICONIFIED

@Native
public static final int WINDOW_DEICONIFIED

The window deiconified event type. This event is delivered when the window has been changed from a minimized to a normal state.

See Also:

• Constant Field Values

WINDOW_ACTIVATED

@Native
public static final int WINDOW_ACTIVATED

The window-activated event type. This event is delivered when the Window becomes the active Window. Only a Frame or a Dialog can be the active Window. The native windowing system may denote the active Window or its children with special decorations, such as a highlighted title bar. The active Window is always either the focused Window, or the first Frame or Dialog that is an owner of the focused Window.

See Also:

• Constant Field Values

WINDOW_DEACTIVATED

@Native
public static final int WINDOW_DEACTIVATED

The window-deactivated event type. This event is delivered when the Window is no longer the active Window. Only a Frame or a Dialog can be the active Window. The native windowing system may denote the active Window or its children with special decorations, such as a highlighted title bar. The active Window is always either the focused Window, or the first Frame or Dialog that is an owner of the focused Window.

See Also:

• Constant Field Values

WINDOW_GAINED_FOCUS

@Native
public static final int WINDOW_GAINED_FOCUS

The window-gained-focus event type. This event is delivered when the Window becomes the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.

See Also:

• Constant Field Values

WINDOW_LOST_FOCUS

@Native
public static final int WINDOW_LOST_FOCUS

The window-lost-focus event type. This event is delivered when a Window is no longer the focused Window, which means keyboard events will no longer be delivered to the Window or any of its subcomponents.

See Also:

• Constant Field Values

WINDOW_STATE_CHANGED

@Native
public static final int WINDOW_STATE_CHANGED

The window-state-changed event type. This event is delivered when a Window's state is changed by virtue of it being iconified, maximized etc.

Since:

1.4

See Also:

• Constant Field Values

WINDOW_LAST

public static final int WINDOW_LAST

The last number in the range of ids used for window events.

See Also:

• Constant Field Values

Constructor Details

WindowEvent

public WindowEvent(Window source,
 int id,
 Window opposite,
 int oldState,
 int newState)

Constructs a WindowEvent object.

This method throws an IllegalArgumentException if source is null.

Parameters:

source - The Window object that originated the event

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

opposite - The other window involved in the focus or activation change, or null

oldState - Previous state of the window for window state change event. See #getOldState() for allowable values

newState - New state of the window for window state change event. See #getNewState() for allowable values

Throws:

IllegalArgumentException - if source is null

Since:

1.4

See Also:

• getWindow()
• AWTEvent.getID()
• getOppositeWindow()
• getOldState()
• getNewState()

WindowEvent

public WindowEvent(Window source,
 int id,
 Window opposite)

Constructs a WindowEvent object with the specified opposite Window. The opposite Window is the other Window involved in this focus or activation change. For a WINDOW_ACTIVATED or WINDOW_GAINED_FOCUS event, this is the Window that lost activation or focus. For a WINDOW_DEACTIVATED or WINDOW_LOST_FOCUS event, this is the Window that gained activation or focus. If this focus change occurs with a native application, with a Java application in a different VM, or with no other Window, then the opposite Window is null.

This method throws an IllegalArgumentException if source is null.

Parameters:

source - The Window object that originated the event

id - An integer indicating the type of event. For information on allowable values, see the class description for WindowEvent. It is expected that this constructor will not be used for other then WINDOW_ACTIVATED,WINDOW_DEACTIVATED, WINDOW_GAINED_FOCUS, or WINDOW_LOST_FOCUS. WindowEvent types, because the opposite Window of other event types will always be null.

opposite - The other Window involved in the focus or activation change, or null

Throws:

IllegalArgumentException - if source is null

Since:

1.4

See Also:

• getWindow()
• AWTEvent.getID()
• getOppositeWindow()

WindowEvent

public WindowEvent(Window source,
 int id,
 int oldState,
 int newState)

Constructs a WindowEvent object with the specified previous and new window states.

This method throws an IllegalArgumentException if source is null.

Parameters:

source - The Window object that originated the event

id - An integer indicating the type of event. For information on allowable values, see the class description for WindowEvent. It is expected that this constructor will not be used for other then WINDOW_STATE_CHANGED WindowEvent types, because the previous and new window states are meaningless for other event types.

oldState - An integer representing the previous window state. See #getOldState() for allowable values

newState - An integer representing the new window state. See #getNewState() for allowable values

Throws:

IllegalArgumentException - if source is null

Since:

1.4

See Also:

• getWindow()
• AWTEvent.getID()
• getOldState()
• getNewState()

WindowEvent

public WindowEvent(Window source,
 int id)

Constructs a WindowEvent object.

This method throws an IllegalArgumentException if source is null.

Parameters:

source - The Window object that originated the event

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

Throws:

IllegalArgumentException - if source is null

See Also:

• getWindow()
• AWTEvent.getID()

Method Details

getWindow

public Window getWindow()

Returns the originator of the event.

Returns:

the Window object that originated the event

getOppositeWindow

public Window getOppositeWindow()

Returns the other Window involved in this focus or activation change. For a WINDOW_ACTIVATED or WINDOW_GAINED_FOCUS event, this is the Window that lost activation or focus. For a WINDOW_DEACTIVATED or WINDOW_LOST_FOCUS event, this is the Window that gained activation or focus. For any other type of WindowEvent, or if the focus or activation change occurs with a native application, with a Java application in a different VM or context, or with no other Window, null is returned.

Returns:

the other Window involved in the focus or activation change, or null

Since:

1.4

getOldState

public int getOldState()

For WINDOW_STATE_CHANGED events returns the previous state of the window. The state is represented as a bitwise mask.

• NORMAL
  Indicates that no state bits are set.
• ICONIFIED
• MAXIMIZED_HORIZ
• MAXIMIZED_VERT
• MAXIMIZED_BOTH
  Concatenates MAXIMIZED_HORIZ and MAXIMIZED_VERT.

Returns:

a bitwise mask of the previous window state

Since:

1.4

See Also:

• Frame.getExtendedState()

getNewState

public int getNewState()

For WINDOW_STATE_CHANGED events returns the new state of the window. The state is represented as a bitwise mask.

• NORMAL
  Indicates that no state bits are set.
• ICONIFIED
• MAXIMIZED_HORIZ
• MAXIMIZED_VERT
• MAXIMIZED_BOTH
  Concatenates MAXIMIZED_HORIZ and MAXIMIZED_VERT.

Returns:

a bitwise mask of the new window state

Since:

1.4

See Also:

• Frame.getExtendedState()

paramString

public String paramString()

Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.

Overrides:

paramString in class ComponentEvent

Returns:

a string identifying the event and its attributes