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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt.event 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.awt.event.ComponentEvent
   java.awt.event.FocusEvent

FocusEvent
public class FocusEvent extends ComponentEvent (Code)
A low-level event which indicates that a Component has gained or lost the input focus. This low-level event is generated by a Component (such as a TextField). The event is passed to every FocusListener or FocusAdapter object which registered to receive such events using the Component's addFocusListener method. ( FocusAdapter objects implement the FocusListener interface.) Each such listener object gets this FocusEvent when the event occurs.

There are two levels of focus events: permanent and temporary. Permanent focus change events occur when focus is directly moved from one Component to another, such as through a call to requestFocus() or as the user uses the TAB key to traverse Components. Temporary focus change events occur when focus is temporarily lost for a Component as the indirect result of another operation, such as Window deactivation or a Scrollbar drag. In this case, the original focus state will automatically be restored once that operation is finished, or, for the case of Window deactivation, when the Window is reactivated. Both permanent and temporary focus events are delivered using the FOCUS_GAINED and FOCUS_LOST event ids; the level may be distinguished in the event using the isTemporary() method.
See Also:   FocusAdapter
See Also:   FocusListener
See Also:    Tutorial: Writing a Focus Listener
author:
   Carl Quinn
author:
   Amy Fowler
version:
   1.41 06/05/07
since:
   1.1



Field Summary
final public static  intFOCUS_FIRST
     The first number in the range of ids used for focus events.
final public static  intFOCUS_GAINED
     This event indicates that the Component is now the focus owner.
final public static  intFOCUS_LAST
     The last number in the range of ids used for focus events.
final public static  intFOCUS_LOST
     This event indicates that the Component is no longer the focus owner.
transient  Componentopposite
     The other Component involved in this focus change.
 booleantemporary
     A focus event can have two different levels, permanent and temporary.

Constructor Summary
public  FocusEvent(Component source, int id, boolean temporary, Component opposite)
     Constructs a FocusEvent object with the specified temporary state and opposite Component. The opposite Component is the other Component involved in this focus change. For a FOCUS_GAINED event, this is the Component that lost focus.
public  FocusEvent(Component source, int id, boolean temporary)
     Constructs a FocusEvent object and identifies whether or not the change is temporary.

Note that passing in an invalid id results in unspecified behavior.

public  FocusEvent(Component source, int id)
     Constructs a FocusEvent object and identifies it as a permanent change in focus.

Note that passing in an invalid id results in unspecified behavior.


Method Summary
public  ComponentgetOppositeComponent()
     Returns the other Component involved in this focus change.
public  booleanisTemporary()
     Identifies the focus change event as temporary or permanent.
public  StringparamString()
     Returns a parameter string identifying this event.

Field Detail
FOCUS_FIRST
final public static int FOCUS_FIRST(Code)
The first number in the range of ids used for focus events.



FOCUS_GAINED
final public static int FOCUS_GAINED(Code)
This event indicates that the Component is now the focus owner.



FOCUS_LAST
final public static int FOCUS_LAST(Code)
The last number in the range of ids used for focus events.



FOCUS_LOST
final public static int FOCUS_LOST(Code)
This event indicates that the Component is no longer the focus owner.



opposite
transient Component opposite(Code)
The other Component involved in this focus change. For a FOCUS_GAINED event, this is the Component that lost focus. For a FOCUS_LOST event, this is the Component that gained focus. If this focus change occurs with a native application, a Java application in a different VM, or with no other Component, then the opposite Component is null.
See Also:   FocusEvent.getOppositeComponent
since:
   1.4



temporary
boolean temporary(Code)
A focus event can have two different levels, permanent and temporary. It will be set to true if some operation takes away the focus temporarily and intends on getting it back once the event is completed. Otherwise it will be set to false.
See Also:   FocusEvent.isTemporary




Constructor Detail
FocusEvent
public FocusEvent(Component source, int id, boolean temporary, Component opposite)(Code)
Constructs a FocusEvent object with the specified temporary state and opposite Component. The opposite Component is the other Component involved in this focus change. For a FOCUS_GAINED event, this is the Component that lost focus. For a FOCUS_LOST event, this is the Component that gained focus. If this focus change occurs with a native application, with a Java application in a different VM, or with no other Component, then the opposite Component is null.

Note that passing in an invalid id results in unspecified behavior. This method throws an IllegalArgumentException if source is null.
Parameters:
  source - the Component that originated the event
Parameters:
  id - FOCUS_GAINED or FOCUS_LOST
Parameters:
  temporary - true if the focus change is temporary;false otherwise
Parameters:
  opposite - the other Component involved in the focus change,or null
throws:
  IllegalArgumentException - if source is null
since:
   1.4




FocusEvent
public FocusEvent(Component source, int id, boolean temporary)(Code)
Constructs a FocusEvent object and identifies whether or not the change is temporary.

Note that passing in an invalid id results in unspecified behavior. This method throws an IllegalArgumentException if source is null.
Parameters:
  source - the Component that originated the event
Parameters:
  id - an integer indicating the type of event
Parameters:
  temporary - true if the focus change is temporary;false otherwise
throws:
  IllegalArgumentException - if source is null




FocusEvent
public FocusEvent(Component source, int id)(Code)
Constructs a FocusEvent object and identifies it as a permanent change in focus.

Note that passing in an invalid id results in unspecified behavior. This method throws an IllegalArgumentException if source is null.
Parameters:
  source - the Component that originated the event
Parameters:
  id - an integer indicating the type of event
throws:
  IllegalArgumentException - if source is null





Method Detail
getOppositeComponent
public Component getOppositeComponent()(Code)
Returns the other Component involved in this focus change. For a FOCUS_GAINED event, this is the Component that lost focus. For a FOCUS_LOST event, this is the Component that gained focus. If this focus change occurs with a native application, with a Java application in a different VM or context, or with no other Component, then null is returned. the other Component involved in the focus change, or null
since:
   1.4



isTemporary
public boolean isTemporary()(Code)
Identifies the focus change event as temporary or permanent. true if the focus change is temporary;false otherwise



paramString
public String paramString()(Code)
Returns a parameter string identifying this event. This method is useful for event-logging and for debugging. a string identifying the event and its attributes



Fields inherited from java.awt.event.ComponentEvent
final public static int COMPONENT_FIRST(Code)(Java Doc)
final public static int COMPONENT_HIDDEN(Code)(Java Doc)
final public static int COMPONENT_LAST(Code)(Java Doc)
final public static int COMPONENT_MOVED(Code)(Java Doc)
final public static int COMPONENT_RESIZED(Code)(Java Doc)
final public static int COMPONENT_SHOWN(Code)(Java Doc)

Methods inherited from java.awt.event.ComponentEvent
public Component getComponent()(Code)(Java Doc)
public String paramString()(Code)(Java Doc)

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