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java.awt.event
Class WindowEvent
java.lang.Object
java.util.EventObject
java.awt.AWTEvent
java.awt.event.ComponentEvent
java.awt.event.WindowEvent
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All Implemented Interfaces:
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Serializable
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public class
WindowEvent
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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.
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Since:
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JDK1.1
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See Also:
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WindowAdapter
,
WindowListener
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Tutorial: Writing a Window Listener
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Reference: The Java Class Libraries (update file)
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Serialized Form
Fields inherited from 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
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Constructor Summary
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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
|
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
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paramString
()
Returns a parameter string identifying this event. |
Methods inherited from class java.awt.
AWTEvent
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consume
,
getID
,
isConsumed
,
setSource
,
toString
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WINDOW_FIRST
public static final int WINDOW_FIRST
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The first number in the range of ids used for window events.
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See Also:
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Constant Field Values
WINDOW_OPENED
public static final int WINDOW_OPENED
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The window opened event. This event is delivered only the first time a window is made visible.
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See Also:
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Constant Field Values
WINDOW_CLOSING
public static final int WINDOW_CLOSING
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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.
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See Also:
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Constant Field Values
WINDOW_CLOSED
public static final int WINDOW_CLOSED
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The window closed event. This event is delivered after the window has been closed as the result of a call to dispose.
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See Also:
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Constant Field Values
WINDOW_ICONIFIED
public static final int WINDOW_ICONIFIED
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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.
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See Also:
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Frame.setIconImage(java.awt.Image)
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Constant Field Values
WINDOW_DEICONIFIED
public static final int WINDOW_DEICONIFIED
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The window deiconified event type. This event is delivered when the window has been changed from a minimized to a normal state.
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See Also:
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Constant Field Values
WINDOW_ACTIVATED
public static final int WINDOW_ACTIVATED
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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.
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See Also:
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Constant Field Values
WINDOW_DEACTIVATED
public static final int WINDOW_DEACTIVATED
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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.
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See Also:
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Constant Field Values
WINDOW_GAINED_FOCUS
public static final int WINDOW_GAINED_FOCUS
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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.
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See Also:
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Constant Field Values
WINDOW_LOST_FOCUS
public static final int WINDOW_LOST_FOCUS
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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.
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See Also:
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Constant Field Values
WINDOW_STATE_CHANGED
public static final int WINDOW_STATE_CHANGED
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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.
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Since:
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1.4
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See Also:
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Constant Field Values
WINDOW_LAST
public static final int WINDOW_LAST
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The last number in the range of ids used for window events.
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See Also:
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Constant Field Values
WindowEvent
public WindowEvent(Window source,
int id,
Window opposite,
int oldState,
int newState)
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Constructs a WindowEvent object.
Note that passing in an invalid id results in unspecified behavior. This method throws an IllegalArgumentException if source is null.
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Parameters:
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source - the Window object that originated the event
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id - an integer indicating the type of event.
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opposite - the other window involved in the focus or activation change, or null
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oldState - previous state of the window for window state change event
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newState - new state of the window for window state change event
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Throws:
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IllegalArgumentException
- if source is null
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Since:
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1.4
WindowEvent
public WindowEvent(Window source,
int id,
Window opposite)
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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.
Note that passing in an invalid id results in unspecified behavior.
This method throws an IllegalArgumentException if source is null.
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Parameters:
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source - the Window object that originated the event
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id - WINDOW_ACTIVATED, WINDOW_DEACTIVATED, WINDOW_GAINED_FOCUS, or WINDOW_LOST_FOCUS. It is expected that this constructor will not be used for other WindowEvent types because the opposite Window of such events will always be null
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opposite - the other Window involved in the focus or activation change, or null
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Throws:
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IllegalArgumentException
- if source is null
WindowEvent
public WindowEvent(Window source,
int id,
int oldState,
int newState)
-
Constructs a WindowEvent object with the specified previous and new window states.
Note that passing in an invalid id results in unspecified behavior. This method throws an IllegalArgumentException if source is null.
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Parameters:
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source - the Window object that originated the event
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id - WINDOW_STATE_CHANGED event type. It is expected that this constructor will not be used for other WindowEvent types, because the previous and new window states are meaningless for other event types.
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oldState - an integer representing the previous window state
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newState - an integer representing the new window state
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Throws:
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IllegalArgumentException
- if source is null
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Since:
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1.4
WindowEvent
public WindowEvent(Window source,
int id)
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Constructs a WindowEvent object.
Note that passing in an invalid id results in unspecified behavior.
This method throws an IllegalArgumentException if source is null.
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Parameters:
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source - the Window object that originated the event
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id - an integer indicating the type of event
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Throws:
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IllegalArgumentException
- if source is null
getWindow
public Window getWindow()
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Returns the originator of the event.
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Returns:
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the Window object that originated the event
getOppositeWindow
public Window getOppositeWindow()
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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.
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Returns:
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the other Window involved in the focus or activation change, or null
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Since:
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1.4
getOldState
public int getOldState()
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For WINDOW_STATE_CHANGED events returns the previous state of the window. The state is represented as a bitwise mask.
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NORMAL
Indicates that no state bits are set. -
ICONIFIED
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MAXIMIZED_HORIZ
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MAXIMIZED_VERT
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MAXIMIZED_BOTH
Concatenates MAXIMIZED_HORIZ and MAXIMIZED_VERT.
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Returns:
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a bitwise mask of the previous window state
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Since:
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1.4
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See Also:
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Frame.getExtendedState()
getNewState
public int getNewState()
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For WINDOW_STATE_CHANGED events returns the new state of the window. The state is represented as a bitwise mask.
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NORMAL
Indicates that no state bits are set. -
ICONIFIED
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MAXIMIZED_HORIZ
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MAXIMIZED_VERT
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MAXIMIZED_BOTH
Concatenates MAXIMIZED_HORIZ and MAXIMIZED_VERT.
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Returns:
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a bitwise mask of the new window state
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Since:
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1.4
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See Also:
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Frame.getExtendedState()
paramString
public String paramString()
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Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.
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Overrides:
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paramString
in class
ComponentEvent
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Returns:
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a string identifying the event and its attributes