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.
WindowAdapter, WindowListener, Tutorial: Writing a Window Listener, Serialized Formpublic static final int WINDOW_FIRST
The first number in the range of ids used for window events.
@Native public static final int WINDOW_OPENED
The window opened event. This event is delivered only the first time a window is made visible.
@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.
@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.
Component.isDisplayable(), Window.dispose(), Constant Field Values@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.
Frame.setIconImage(java.awt.Image), Constant Field Values@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.
@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.
@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.
@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.
@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.
@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.
public static final int WINDOW_LAST
The last number in the range of ids used for window events.
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.
source - The Window object that originated the eventid - 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 valuesnewState - New state of the window for window state change event. See #getNewState() for allowable valuesIllegalArgumentException - if source is nullgetWindow(), AWTEvent.getID(), getOppositeWindow(), getOldState(), getNewState()
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.
source - The Window object that originated the eventid - 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
IllegalArgumentException - if source is nullgetWindow(), AWTEvent.getID(), getOppositeWindow()
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.
source - The Window object that originated the eventid - 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 valuesnewState - An integer representing the new window state. See #getNewState() for allowable valuesIllegalArgumentException - if source is nullgetWindow(), AWTEvent.getID(), getOldState(), getNewState()
public WindowEvent(Window source,
int id) Constructs a WindowEvent object.
This method throws an IllegalArgumentException if source is null.
source - The Window object that originated the eventid - An integer indicating the type of event. For information on allowable values, see the class description for WindowEvent.IllegalArgumentException - if source is nullgetWindow(), AWTEvent.getID()
public Window getWindow()
Returns the originator of the event.
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.
public int getOldState()
For WINDOW_STATE_CHANGED events returns the previous state of the window. The state is represented as a bitwise mask.
NORMAL ICONIFIED MAXIMIZED_HORIZ MAXIMIZED_VERT MAXIMIZED_BOTH MAXIMIZED_HORIZ and MAXIMIZED_VERT. Frame.getExtendedState()public int getNewState()
For WINDOW_STATE_CHANGED events returns the new state of the window. The state is represented as a bitwise mask.
NORMAL ICONIFIED MAXIMIZED_HORIZ MAXIMIZED_VERT MAXIMIZED_BOTH MAXIMIZED_HORIZ and MAXIMIZED_VERT. Frame.getExtendedState()public String paramString()
Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.
paramString in class ComponentEvent
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