public class ItemEvent extends AWTEvent
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
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".
An unspecified behavior will be caused if the
id parameter of any particular
ItemEvent instance is not in the range from
stateChange of any
ItemEvent instance takes one of the following values:
ItemListener, Tutorial: Writing an Item Listener, Serialized Form
public static final int ITEM_FIRST
The first number in the range of ids used for item events.
public static final int ITEM_LAST
The last number in the range of ids used for item events.
public static final int ITEM_STATE_CHANGED
This event id indicates that an item's state changed.
public static final int SELECTED
This state-change value indicates that an item was selected.
public static final int DESELECTED
This state-change-value indicates that a selected item was deselected.
public ItemEvent(ItemSelectable source, int id, Object item, int stateChange)
This method throws an
ItemSelectableobject that originated the event
id- The integer that identifies the event type. For information on allowable values, see the class description for
item- An object -- the item affected by the event
stateChange- An integer that indicates whether the item was selected or deselected. For information on allowable values, see the class description for
public ItemSelectable getItemSelectable()
Returns the originator of the event.
public Object getItem()
Returns the item affected by the event.
public int getStateChange()
Returns the type of state change (selected or deselected).
public String paramString()
Returns a parameter string identifying this item event. This method is useful for event-logging and for debugging.
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