java/15 : java.desktop/java/awt/event/WindowEvent.java

WindowEvent
https://openjdk.java.net/
GPLv2 + Classpath Exception
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package java.awt.event;

import java.awt.Window;
import java.lang.annotation.Native;
import sun.awt.AppContext;
import sun.awt.SunToolkit;

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. 
Author: Carl Quinn, Amy Fowler
See Also: WindowAdapter
WindowListener
Tutorial: Writing a Window Listener
Since: 1.1/**
 * 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.
 * <P>
 * The event is passed to every {@code WindowListener}
 * or {@code WindowAdapter} object which registered to receive such
 * events using the window's {@code addWindowListener} method.
 * ({@code WindowAdapter} objects implement the
 * {@code WindowListener} interface.) Each such listener object
 * gets this {@code WindowEvent} when the event occurs.
 * <p>
 * An unspecified behavior will be caused if the {@code id} parameter
 * of any particular {@code WindowEvent} instance is not
 * in the range from {@code WINDOW_FIRST} to {@code WINDOW_LAST}.
 *
 * @author Carl Quinn
 * @author Amy Fowler
 *
 * @see WindowAdapter
 * @see WindowListener
 * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/windowlistener.html">Tutorial: Writing a Window Listener</a>
 *
 * @since 1.1
 */
public class WindowEvent extends ComponentEvent {

    The first number in the range of ids used for window events.
/**
     * The first number in the range of ids used for window events.
     */
    public static final int WINDOW_FIRST        = 200;

    The window opened event.  This event is delivered only
the first time a window is made visible.
/**
     * The window opened event.  This event is delivered only
     * the first time a window is made visible.
     */
    @Native public static final int WINDOW_OPENED       = WINDOW_FIRST; // 200

    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.
/**
     * 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_CLOSING      = 1 + WINDOW_FIRST; //Event.WINDOW_DESTROY

    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: isDisplayable.isDisplayable
Window.dispose/**
     * The window closed event. This event is delivered after the displayable
     * window has been closed as the result of a call to dispose.
     * @see java.awt.Component#isDisplayable
     * @see Window#dispose
     */
    @Native public static final int WINDOW_CLOSED       = 2 + WINDOW_FIRST;

    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: setIconImage.setIconImage/**
     * 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 java.awt.Frame#setIconImage
     */
    @Native public static final int WINDOW_ICONIFIED    = 3 + WINDOW_FIRST; //Event.WINDOW_ICONIFY

    The window deiconified event type. This event is delivered when
the window has been changed from a minimized to a normal state.
/**
     * 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_DEICONIFIED  = 4 + WINDOW_FIRST; //Event.WINDOW_DEICONIFY

    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.
/**
     * 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_ACTIVATED    = 5 + WINDOW_FIRST;

    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.
/**
     * 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_DEACTIVATED  = 6 + WINDOW_FIRST;

    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.
/**
     * 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_GAINED_FOCUS = 7 + WINDOW_FIRST;

    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.
/**
     * 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_LOST_FOCUS   = 8 + WINDOW_FIRST;

    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/**
     * 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
     */
    @Native public static final int WINDOW_STATE_CHANGED = 9 + WINDOW_FIRST;

    The last number in the range of ids used for window events.
/**
     * The last number in the range of ids used for window events.
     */
    public static final int WINDOW_LAST         = WINDOW_STATE_CHANGED;

    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, a Java application in a different VM, or with no
other Window, null is returned.
See Also: getOppositeWindow
Since: 1.4/**
     * 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, a Java application in a different VM, or with no
     * other Window, null is returned.
     *
     * @see #getOppositeWindow
     * @since 1.4
     */
    transient Window opposite;

    TBS
/**
     * TBS
     */
    int oldState;
    int newState;


    /*
     * JDK 1.1 serialVersionUID
     */
    private static final long serialVersionUID = -1567959133147912127L;


    Constructs a WindowEvent object. This method throws an IllegalArgumentException if source is null. 
Params: 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
See Also: getWindow()
AWTEvent.getID()
getOppositeWindow()
getOldState()
getNewState()
Since: 1.4/**
     * Constructs a {@code WindowEvent} object.
     * <p>This method throws an
     * {@code IllegalArgumentException} if {@code source}
     * is {@code null}.
     *
     * @param source    The {@code Window} object
     *                    that originated the event
     * @param id        An integer indicating the type of event.
     *                     For information on allowable values, see
     *                     the class description for {@link WindowEvent}
     * @param opposite  The other window involved in the focus or activation
     *                      change, or {@code null}
     * @param oldState  Previous state of the window for window state change event.
     *                  See {@code #getOldState()} for allowable values
     * @param newState  New state of the window for window state change event.
     *                  See {@code #getNewState()} for allowable values
     * @throws IllegalArgumentException if {@code source} is null
     * @see #getWindow()
     * @see #getID()
     * @see #getOppositeWindow()
     * @see #getOldState()
     * @see #getNewState()
     * @since 1.4
     */
    public WindowEvent(Window source, int id, Window opposite,
                       int oldState, int newState)
    {
        super(source, id);
        this.opposite = opposite;
        this.oldState = oldState;
        this.newState = newState;
    }

    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. 
Params: 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
See Also: getWindow()
AWTEvent.getID()
getOppositeWindow()
Since: 1.4/**
     * Constructs a {@code WindowEvent} object with the
     * specified opposite {@code Window}. The opposite
     * {@code Window} is the other {@code Window}
     * involved in this focus or activation change.
     * For a {@code WINDOW_ACTIVATED} or
     * {@code WINDOW_GAINED_FOCUS} event, this is the
     * {@code Window} that lost activation or focus.
     * For a {@code WINDOW_DEACTIVATED} or
     * {@code WINDOW_LOST_FOCUS} event, this is the
     * {@code 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
     * {@code Window}, then the opposite Window is {@code null}.
     * <p>This method throws an
     * {@code IllegalArgumentException} if {@code source}
     * is {@code null}.
     *
     * @param source     The {@code Window} object that
     *                   originated the event
     * @param id        An integer indicating the type of event.
     *                     For information on allowable values, see
     *                     the class description for {@link WindowEvent}.
     *                  It is expected that this constructor will not
     *                  be used for other then
     *                  {@code WINDOW_ACTIVATED},{@code WINDOW_DEACTIVATED},
     *                  {@code WINDOW_GAINED_FOCUS}, or {@code WINDOW_LOST_FOCUS}.
     *                  {@code WindowEvent} types,
     *                  because the opposite {@code Window} of other event types
     *                  will always be {@code null}.
     * @param opposite   The other {@code Window} involved in the
     *                   focus or activation change, or {@code null}
     * @throws IllegalArgumentException if {@code source} is null
     * @see #getWindow()
     * @see #getID()
     * @see #getOppositeWindow()
     * @since 1.4
     */
    public WindowEvent(Window source, int id, Window opposite) {
        this(source, id, opposite, 0, 0);
    }

    Constructs a WindowEvent object with the specified previous and new window states. This method throws an IllegalArgumentException if source is null. 
Params: 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
See Also: getWindow()
AWTEvent.getID()
getOldState()
getNewState()
Since: 1.4/**
     * Constructs a {@code WindowEvent} object with the specified
     * previous and new window states.
     * <p>This method throws an
     * {@code IllegalArgumentException} if {@code source}
     * is {@code null}.
     *
     * @param source    The {@code Window} object
     *                  that originated the event
     * @param id        An integer indicating the type of event.
     *                     For information on allowable values, see
     *                     the class description for {@link WindowEvent}.
     *                  It is expected that this constructor will not
     *                  be used for other then
     *                  {@code WINDOW_STATE_CHANGED}
     *                  {@code WindowEvent}
     *                  types, because the previous and new window
     *                  states are meaningless for other event types.
     * @param oldState  An integer representing the previous window state.
     *                  See {@code #getOldState()} for allowable values
     * @param newState  An integer representing the new window state.
     *                  See {@code #getNewState()} for allowable values
     * @throws IllegalArgumentException if {@code source} is null
     * @see #getWindow()
     * @see #getID()
     * @see #getOldState()
     * @see #getNewState()
     * @since 1.4
     */
    public WindowEvent(Window source, int id, int oldState, int newState) {
        this(source, id, null, oldState, newState);
    }

    Constructs a WindowEvent object. This method throws an IllegalArgumentException if source is null. 
Params: 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()/**
     * Constructs a {@code WindowEvent} object.
     * <p>This method throws an
     * {@code IllegalArgumentException} if {@code source}
     * is {@code null}.
     *
     * @param source The {@code Window} object that originated the event
     * @param id     An integer indicating the type of event.
     *                     For information on allowable values, see
     *                     the class description for {@link WindowEvent}.
     * @throws IllegalArgumentException if {@code source} is null
     * @see #getWindow()
     * @see #getID()
     */
    public WindowEvent(Window source, int id) {
        this(source, id, null, 0, 0);
    }

    Returns the originator of the event.
Returns: the Window object that originated the event/**
     * Returns the originator of the event.
     *
     * @return the Window object that originated the event
     */
    public Window getWindow() {
        return (source instanceof Window) ? (Window)source : null;
    }

    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/**
     * 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.
     *
     * @return the other Window involved in the focus or activation change, or
     *         null
     * @since 1.4
     */
    public Window getOppositeWindow() {
        if (opposite == null) {
            return null;
        }

        return (SunToolkit.targetToAppContext(opposite) ==
                AppContext.getAppContext())
            ? opposite
            : null;
    }

    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. 
See Also: Frame.getExtendedState()
Returns: a bitwise mask of the previous window state
Since: 1.4/**
     * For {@code WINDOW_STATE_CHANGED} events returns the
     * previous state of the window. The state is
     * represented as a bitwise mask.
     * <ul>
     * <li>{@code NORMAL}
     * <br>Indicates that no state bits are set.
     * <li>{@code ICONIFIED}
     * <li>{@code MAXIMIZED_HORIZ}
     * <li>{@code MAXIMIZED_VERT}
     * <li>{@code MAXIMIZED_BOTH}
     * <br>Concatenates {@code MAXIMIZED_HORIZ}
     * and {@code MAXIMIZED_VERT}.
     * </ul>
     *
     * @return a bitwise mask of the previous window state
     * @see java.awt.Frame#getExtendedState()
     * @since 1.4
     */
    public int getOldState() {
        return oldState;
    }

    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. 
See Also: Frame.getExtendedState()
Returns: a bitwise mask of the new window state
Since: 1.4/**
     * For {@code WINDOW_STATE_CHANGED} events returns the
     * new state of the window. The state is
     * represented as a bitwise mask.
     * <ul>
     * <li>{@code NORMAL}
     * <br>Indicates that no state bits are set.
     * <li>{@code ICONIFIED}
     * <li>{@code MAXIMIZED_HORIZ}
     * <li>{@code MAXIMIZED_VERT}
     * <li>{@code MAXIMIZED_BOTH}
     * <br>Concatenates {@code MAXIMIZED_HORIZ}
     * and {@code MAXIMIZED_VERT}.
     * </ul>
     *
     * @return a bitwise mask of the new window state
     * @see java.awt.Frame#getExtendedState()
     * @since 1.4
     */
    public int getNewState() {
        return newState;
    }

    Returns a parameter string identifying this event.
This method is useful for event-logging and for debugging.
Returns: a string identifying the event and its attributes/**
     * Returns a parameter string identifying this event.
     * This method is useful for event-logging and for debugging.
     *
     * @return a string identifying the event and its attributes
     */
    public String paramString() {
        String typeStr;
        switch(id) {
          case WINDOW_OPENED:
              typeStr = "WINDOW_OPENED";
              break;
          case WINDOW_CLOSING:
              typeStr = "WINDOW_CLOSING";
              break;
          case WINDOW_CLOSED:
              typeStr = "WINDOW_CLOSED";
              break;
          case WINDOW_ICONIFIED:
              typeStr = "WINDOW_ICONIFIED";
              break;
          case WINDOW_DEICONIFIED:
              typeStr = "WINDOW_DEICONIFIED";
              break;
          case WINDOW_ACTIVATED:
              typeStr = "WINDOW_ACTIVATED";
              break;
          case WINDOW_DEACTIVATED:
              typeStr = "WINDOW_DEACTIVATED";
              break;
          case WINDOW_GAINED_FOCUS:
              typeStr = "WINDOW_GAINED_FOCUS";
              break;
          case WINDOW_LOST_FOCUS:
              typeStr = "WINDOW_LOST_FOCUS";
              break;
          case WINDOW_STATE_CHANGED:
              typeStr = "WINDOW_STATE_CHANGED";
              break;
          default:
              typeStr = "unknown type";
        }
        typeStr += ",opposite=" + getOppositeWindow()
            + ",oldState=" + oldState + ",newState=" + newState;

        return typeStr;
    }
}
Author:	Carl Quinn, Amy Fowler
See Also:	WindowAdapter WindowListener Tutorial: Writing a Window Listener
Since:	1.1
Params:	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
See Also:	getWindow() AWTEvent.getID() getOppositeWindow() getOldState() getNewState()
Since:	1.4
Returns:	the other Window involved in the focus or activation change, or null
Since:	1.4
See Also:	Frame.getExtendedState()
Returns:	a bitwise mask of the previous window state
Since:	1.4
/

java/ 15/ java.desktop/java/awt/event/WindowEvent.java
