Class 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

Fields

Modifier and Type Field Description
static int WINDOW_ACTIVATED

The window-activated event type.
static int WINDOW_CLOSED

The window closed event.
static int WINDOW_CLOSING

The "window is closing" event.
static int WINDOW_DEACTIVATED

The window-deactivated event type.
static int WINDOW_DEICONIFIED

The window deiconified event type.
static int WINDOW_FIRST

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

The window-gained-focus event type.
static int WINDOW_ICONIFIED

The window iconified event.
static int WINDOW_LAST

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

The window-lost-focus event type.
static int WINDOW_OPENED

The window opened event.
static int WINDOW_STATE_CHANGED

The window-state-changed event type.

Fields declared in class java.awt.event.ComponentEvent

COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN

Fields declared in class java.awt.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

Fields declared in class java.util.EventObject

source

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.

Methods

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 java.awt.event.ComponentEvent

getComponent

Methods declared in class java.awt.AWTEvent

consume, getID, isConsumed, setSource, toString

Methods declared in class java.util.EventObject

getSource

Methods declared in class java.lang.Object

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

Fields

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(java.awt.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

Constructors

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()

Methods

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

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https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/java/awt/event/WindowEvent.html