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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class AWTEvent - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.awt
Class AWTEvent

java.lang.Object
  |
  +--java.util.EventObject
        |
        +--java.awt.AWTEvent
Direct Known Subclasses:
ActionEvent, AdjustmentEvent, AncestorEvent, ComponentEvent, InputMethodEvent, InternalFrameEvent, InvocationEvent, ItemEvent, TextEvent
public abstract class AWTEvent
extends EventObject

The root event class for all AWT events. This class and its subclasses supercede the original java.awt.Event class. Subclasses of this root AWTEvent class defined outside of the java.awt.event package should define event ID values greater than the value defined by RESERVED_ID_MAX. The event masks defined in this class are needed ONLY by component subclasses which are using Component.enableEvents() to select for event types not selected by registered listeners. If a listener is registered on a component, the appropriate event mask is already set internally by the component.

See Also:
Component.enableEvents(long), ComponentEvent, FocusEvent, KeyEvent, MouseEvent, WindowEvent, ActionEvent, AdjustmentEvent, ItemEvent, TextEvent, Serialized Form

Field Summary
static long ACTION_EVENT_MASK
          The event mask for selecting action events.
static long ADJUSTMENT_EVENT_MASK
          The event mask for selecting adjustment events.
static long COMPONENT_EVENT_MASK
          The event mask for selecting component events.
protected  boolean consumed
           
static long CONTAINER_EVENT_MASK
          The event mask for selecting container events.
static long FOCUS_EVENT_MASK
          The event mask for selecting focus events.
protected  int id
           
static long INPUT_METHOD_EVENT_MASK
          The event mask for selecting input method events.
static long ITEM_EVENT_MASK
          The event mask for selecting item events.
static long KEY_EVENT_MASK
          The event mask for selecting key events.
static long MOUSE_EVENT_MASK
          The event mask for selecting mouse events.
static long MOUSE_MOTION_EVENT_MASK
          The event mask for selecting mouse motion events.
static int RESERVED_ID_MAX
          The maximum value for reserved AWT event IDs.
static long TEXT_EVENT_MASK
          The event mask for selecting text events.
static long WINDOW_EVENT_MASK
          The event mask for selecting window events.
 
Fields inherited from class java.util.EventObject
source
 
Constructor Summary
AWTEvent(Event event)
          Constructs an AWTEvent object from the parameters of a 1.0-style event.
AWTEvent(Object source, int id)
          Constructs an AWTEvent object with the specified source object and type.
 
Method Summary
protected  void consume()
           
protected  void finalize()
          Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
 int getID()
          Returns the event type.
protected  boolean isConsumed()
           
 String paramString()
          Returns a string representing the state of this event.
 String toString()
          Returns a String representation of this EventObject.
 
Methods inherited from class java.util.EventObject
getSource
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

id

protected int id

consumed

protected boolean consumed

COMPONENT_EVENT_MASK

public static final long COMPONENT_EVENT_MASK
The event mask for selecting component events.

CONTAINER_EVENT_MASK

public static final long CONTAINER_EVENT_MASK
The event mask for selecting container events.

FOCUS_EVENT_MASK

public static final long FOCUS_EVENT_MASK
The event mask for selecting focus events.

KEY_EVENT_MASK

public static final long KEY_EVENT_MASK
The event mask for selecting key events.

MOUSE_EVENT_MASK

public static final long MOUSE_EVENT_MASK
The event mask for selecting mouse events.

MOUSE_MOTION_EVENT_MASK

public static final long MOUSE_MOTION_EVENT_MASK
The event mask for selecting mouse motion events.

WINDOW_EVENT_MASK

public static final long WINDOW_EVENT_MASK
The event mask for selecting window events.

ACTION_EVENT_MASK

public static final long ACTION_EVENT_MASK
The event mask for selecting action events.

ADJUSTMENT_EVENT_MASK

public static final long ADJUSTMENT_EVENT_MASK
The event mask for selecting adjustment events.

ITEM_EVENT_MASK

public static final long ITEM_EVENT_MASK
The event mask for selecting item events.

TEXT_EVENT_MASK

public static final long TEXT_EVENT_MASK
The event mask for selecting text events.

INPUT_METHOD_EVENT_MASK

public static final long INPUT_METHOD_EVENT_MASK
The event mask for selecting input method events.

RESERVED_ID_MAX

public static final int RESERVED_ID_MAX
The maximum value for reserved AWT event IDs. Programs defining their own event IDs should use IDs greater than this value.
Constructor Detail

AWTEvent

public AWTEvent(Event event)
Constructs an AWTEvent object from the parameters of a 1.0-style event.
Parameters:
event - the old-style event

AWTEvent

public AWTEvent(Object source,
                int id)
Constructs an AWTEvent object with the specified source object and type.
Parameters:
source - the object where the event originated
Method Detail

getID

public int getID()
Returns the event type.

toString

public String toString()
Description copied from class: EventObject
Returns a String representation of this EventObject.
Overrides:
toString in class EventObject
Tags copied from class: EventObject
Returns:
A a String representation of this EventObject.

paramString

public String paramString()
Returns a string representing the state of this event. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.
Returns:
a string representation of this event.

consume

protected void consume()

isConsumed

protected boolean isConsumed()

finalize

protected void finalize()
                 throws Throwable
Description copied from class: Object
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup.

The general contract of finalize is that it is invoked if and when the JavaTM virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The finalize method may take any action, including making this object available again to other threads; the usual purpose of finalize, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition.

The Java programming language does not guarantee which thread will invoke the finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The finalize method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the finalize method causes the finalization of this object to be halted, but is otherwise ignored.

Overrides:
finalize in class Object
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