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java.lang.Objectjava.util.EventObject
java.awt.AWTEvent
java.awt.event.ComponentEvent
java.awt.event.FocusEvent
public class FocusEvent
This class represents an event generated when a focus change occurs for a component. There are both temporary changes, such as when focus is stolen during a sroll then returned, and permanent changes, such as when the user TABs through focusable components.
FocusAdapter,
FocusListener,
Serialized Form| Field Summary | |
|---|---|
static int |
FOCUS_FIRST
This is the first id in the range of ids used by this class. |
static int |
FOCUS_GAINED
This is the event id for a focus gained event. |
static int |
FOCUS_LAST
This is the last id in the range of ids used by this class. |
static int |
FOCUS_LOST
This is the event id for a focus lost event. |
| Fields inherited from class java.awt.event.ComponentEvent |
|---|
COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN |
| Fields inherited from class java.util.EventObject |
|---|
source |
| Constructor Summary | |
|---|---|
FocusEvent(Component source,
int id)
Initializes a new instance of FocusEvent with the
specified source and id. |
|
FocusEvent(Component source,
int id,
boolean temporary)
Initializes a new instance of FocusEvent with the
specified source, id, and temporary status. |
|
FocusEvent(Component source,
int id,
boolean temporary,
Component opposite)
Initializes a new instance of FocusEvent with the
specified source, id, temporary status, and opposite counterpart. |
|
| Method Summary | |
|---|---|
Component |
getOppositeComponent()
Returns the component which received the opposite focus event. |
boolean |
isTemporary()
This method tests whether or not the focus change is temporary or permanent. |
String |
paramString()
Returns a string identifying this event. |
| Methods inherited from class java.awt.event.ComponentEvent |
|---|
getComponent |
| Methods inherited from class java.awt.AWTEvent |
|---|
consume, getID, isConsumed, setSource, toString |
| Methods inherited from class java.util.EventObject |
|---|
getSource |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Field Detail |
|---|
public static final int FOCUS_FIRST
public static final int FOCUS_LAST
public static final int FOCUS_GAINED
public static final int FOCUS_LOST
| Constructor Detail |
|---|
public FocusEvent(Component source,
int id,
boolean temporary,
Component opposite)
FocusEvent with the
specified source, id, temporary status, and opposite counterpart. Note
that an invalid id leads to unspecified results.
source - the component that is gaining or losing focusid - the event idtemporary - true if the focus change is temporaryopposite - the component receiving the opposite focus event, or null
IllegalArgumentException - if source is null
public FocusEvent(Component source,
int id,
boolean temporary)
FocusEvent with the
specified source, id, and temporary status. Note that an invalid id
leads to unspecified results.
source - the component that is gaining or losing focusid - the event idtemporary - true if the focus change is temporary
IllegalArgumentException - if source is null
public FocusEvent(Component source,
int id)
FocusEvent with the
specified source and id. Note that an invalid id leads to unspecified
results.
source - the component that is gaining or losing focusid - the event id
IllegalArgumentException - if source is null| Method Detail |
|---|
public boolean isTemporary()
public Component getOppositeComponent()
public String paramString()
(getID() == FOCUS_GAINED ? "FOCUS_GAINED" : "FOCUS_LOST")
+ (isTemporary() ? ",temporary," : ",permanent,") + "opposite="
+ getOppositeComponent().
paramString in class ComponentEvent
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