JDK14/Java14源码在线阅读
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*
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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.
* <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.
*/
public static final int WINDOW_FIRST = 200;
/**
* 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.
*/
@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 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 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.
*/
@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.
*/
@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.
*/
@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.
*/
@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.
*/
@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
*/
@Native public static final int WINDOW_STATE_CHANGED = 9 + WINDOW_FIRST;
/**
* 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 #getOppositeWindow
* @since 1.4
*/
transient Window opposite;
/**
* TBS
*/
int oldState;
int newState;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = -1567959133147912127L;
/**
* 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 {@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 {@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 {@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.
*
* @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.
*
* @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 {@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 {@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>
*
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