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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.util.EventObject java.awt.AWTEvent java.awt.event.ItemEvent
public class ItemEvent
A semantic event which indicates that an item was selected or deselected.
This high-level event is generated by an ItemSelectable object (such as a
List) when an item is selected or deselected by the user.
The event is passed to every ItemListener
object which
registered to receive such events using the component's
addItemListener
method.
The object that implements the ItemListener
interface gets
this ItemEvent
when the event occurs. The listener is
spared the details of processing individual mouse movements and mouse
clicks, and can instead process a "meaningful" (semantic) event like
"item selected" or "item deselected".
ItemSelectable
,
ItemListener
,
Tutorial: Writing an Item Listener,
Serialized FormField Summary | |
---|---|
static int |
DESELECTED
This state-change-value indicates that a selected item was deselected. |
static int |
ITEM_FIRST
The first number in the range of ids used for item events. |
static int |
ITEM_LAST
The last number in the range of ids used for item events. |
static int |
ITEM_STATE_CHANGED
This event id indicates that an item's state changed. |
static int |
SELECTED
This state-change value indicates that an item was selected. |
Fields inherited from class java.util.EventObject |
---|
source |
Constructor Summary | |
---|---|
ItemEvent(ItemSelectable source,
int id,
Object item,
int stateChange)
Constructs an ItemEvent object. |
Method Summary | |
---|---|
Object |
getItem()
Returns the item affected by the event. |
ItemSelectable |
getItemSelectable()
Returns the originator of the event. |
int |
getStateChange()
Returns the type of state change (selected or deselected). |
String |
paramString()
Returns a parameter string identifying this item event. |
Methods inherited from class java.awt.AWTEvent |
---|
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 |
---|
public static final int ITEM_FIRST
public static final int ITEM_LAST
public static final int ITEM_STATE_CHANGED
public static final int SELECTED
public static final int DESELECTED
Constructor Detail |
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public ItemEvent(ItemSelectable source, int id, Object item, int stateChange)
ItemEvent
object.
Note that passing in an invalid id
results in
unspecified behavior. This method throws an
IllegalArgumentException
if source
is null
.
source
- the ItemSelectable
object
that originated the eventid
- an integer that identifies the event typeitem
- an object -- the item affected by the eventstateChange
- an integer that indicates whether the item was
selected or deselected
IllegalArgumentException
- if source
is nullMethod Detail |
---|
public ItemSelectable getItemSelectable()
public Object getItem()
public int getStateChange()
SELECTED
,
DESELECTED
public String paramString()
paramString
in class AWTEvent
|
Java™ Platform Standard Ed. 6 |
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