java.lang.Object java.util.EventObject java.awt.AWTEvent java.awt.event.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".
Field Summary | |
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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.awt. AWTEvent |
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ACTION_EVENT_MASK , ADJUSTMENT_EVENT_MASK , COMPONENT_EVENT_MASK , consumed , CONTAINER_EVENT_MASK , FOCUS_EVENT_MASK , HIERARCHY_BOUNDS_EVENT_MASK , HIERARCHY_EVENT_MASK , id , INPUT_METHOD_EVENT_MASK , INVOCATION_EVENT_MASK , ITEM_EVENT_MASK , KEY_EVENT_MASK , MOUSE_EVENT_MASK , MOUSE_MOTION_EVENT_MASK , MOUSE_WHEEL_EVENT_MASK , PAINT_EVENT_MASK , RESERVED_ID_MAX , TEXT_EVENT_MASK , WINDOW_EVENT_MASK , WINDOW_FOCUS_EVENT_MASK , WINDOW_STATE_EVENT_MASK |
Fields inherited from class java.util. EventObject |
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source |
Constructor Summary | |
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ItemEvent
(
ItemSelectable
source, int id,
Object
item, int stateChange) Constructs an ItemEvent object. |
Method Summary | |
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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 |
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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 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)
Note that passing in an invalid id results in unspecified behavior. This method throws an IllegalArgumentException if source is null.
Method Detail |
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public ItemSelectable getItemSelectable()
public Object getItem()
public int getStateChange()
public String paramString()