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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 FormField 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 |
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COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN |
Fields inherited from class java.util.EventObject |
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source |
Constructor Summary | |
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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 |
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getComponent |
Methods inherited from class java.awt.AWTEvent |
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consume, getID, isConsumed, setSource, toString |
Methods inherited from class java.util.EventObject |
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getSource |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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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 |
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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 nullpublic 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 nullpublic 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 nullMethod Detail |
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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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