WindowEvent (Java Platform SE 8 )

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 transfered 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:

JDK1.1

See Also:

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

Field Summary

Fields
Modifier and Type	Field and 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 inherited from class java.awt.event.ComponentEvent
COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN

Fields inherited from class java.util.EventObject
source

Constructor Summary

Constructors
Constructor and 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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and 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 inherited from class java.awt.event.ComponentEvent
getComponent

Methods inherited from class java.awt.AWTEvent
consume, getID, isConsumed, setSource, toString

Methods inherited from class java.util.EventObject
getSource

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - 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:
    
    Frame.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
- Constructor Detail
  - 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 Detail
  - 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

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2022, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

Class WindowEvent

Field Summary

Fields inherited from class java.awt.event.ComponentEvent

Fields inherited from class java.awt.AWTEvent

Fields inherited from class java.util.EventObject

Constructor Summary

Method Summary

Methods inherited from class java.awt.event.ComponentEvent

Methods inherited from class java.awt.AWTEvent

Methods inherited from class java.util.EventObject

Methods inherited from class java.lang.Object

Field Detail

WINDOW_FIRST

WINDOW_OPENED

WINDOW_CLOSING

WINDOW_CLOSED

WINDOW_ICONIFIED

WINDOW_DEICONIFIED

WINDOW_ACTIVATED

WINDOW_DEACTIVATED

WINDOW_GAINED_FOCUS

WINDOW_LOST_FOCUS

WINDOW_STATE_CHANGED

WINDOW_LAST

Constructor Detail

WindowEvent

WindowEvent

WindowEvent

WindowEvent

Method Detail

getWindow

getOppositeWindow

getOldState

getNewState

paramString