Adobe® Flex® 4 Language Reference
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mx.events 
ListEvent 
Packagemx.events
Classpublic class ListEvent
InheritanceListEvent Inheritance Event Inheritance Object
Subclasses MenuEvent

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent class represents events associated with items in list-based controls such as List, Tree, Menu, and DataGrid.

See also



Public Properties
 PropertyDefined By
 Inheritedbubbles : Boolean
[read-only] Indicates whether an event is a bubbling event.
Event
 Inheritedcancelable : Boolean
[read-only] Indicates whether the behavior associated with the event can be prevented.
Event
  columnIndex : int
The zero-based index of the column that contains the item renderer where the event occurred.
ListEvent
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
 InheritedcurrentTarget : Object
[read-only] The object that is actively processing the Event object with an event listener.
Event
 InheritedeventPhase : uint
[read-only] The current phase in the event flow.
Event
  itemRenderer : IListItemRenderer
The item renderer where the event occurred.
ListEvent
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
  reason : String
The reason the itemEditEnd event was dispatched.
ListEvent
  rowIndex : int
In the zero-based index of the row that contains the item renderer where the event occured, or for editing events, the index of the item in the data provider that is being edited.
ListEvent
 Inheritedtarget : Object
[read-only] The event target.
Event
 Inheritedtype : String
[read-only] The type of event.
Event
Public Methods
 MethodDefined By
  
ListEvent(type:String, bubbles:Boolean = false, cancelable:Boolean = false, columnIndex:int = -1, rowIndex:int = -1, reason:String = null, itemRenderer:IListItemRenderer = null)
Constructor.
ListEvent
 Inherited
Duplicates an instance of an Event subclass.
Event
 Inherited
formatToString(className:String, ... arguments):String
A utility function for implementing the toString() method in custom ActionScript 3.0 Event classes.
Event
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Checks whether the preventDefault() method has been called on the event.
Event
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Cancels an event's default behavior if that behavior can be canceled.
Event
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Prevents processing of any event listeners in the current node and any subsequent nodes in the event flow.
Event
 Inherited
Prevents processing of any event listeners in nodes subsequent to the current node in the event flow.
Event
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns a string containing all the properties of the Event object.
Event
 Inherited
Returns the primitive value of the specified object.
Object
Public Constants
 ConstantDefined By
 InheritedACTIVATE : String = "activate"
[static] The ACTIVATE constant defines the value of the type property of an activate event object.
Event
 InheritedADDED : String = "added"
[static] The Event.ADDED constant defines the value of the type property of an added event object.
Event
 InheritedADDED_TO_STAGE : String = "addedToStage"
[static] The Event.ADDED_TO_STAGE constant defines the value of the type property of an addedToStage event object.
Event
 InheritedCANCEL : String = "cancel"
[static] The Event.CANCEL constant defines the value of the type property of a cancel event object.
Event
  CHANGE : String = "change"
[static] The ListEvent.CHANGE constant defines the value of the type property of the ListEvent object for a change event, which indicates that selection changed as a result of user interaction.
ListEvent
 InheritedCLEAR : String = "clear"
[static] The Event.CLEAR constant efines the value of the type property of a clear event object.
Event
 InheritedCLOSE : String = "close"
[static] The Event.CLOSE constant defines the value of the type property of a close event object.
Event
 InheritedAIR-only CLOSING : String = "closing"
[static] The Event.CLOSING constant defines the value of the type property of a closing event object.
Event
 InheritedCOMPLETE : String = "complete"
[static] The Event.COMPLETE constant defines the value of the type property of a complete event object.
Event
 InheritedCONNECT : String = "connect"
[static] The Event.CONNECT constant defines the value of the type property of a connect event object.
Event
 InheritedCOPY : String = "copy"
[static] Defines the value of the type property of a copy event object.
Event
 InheritedCUT : String = "cut"
[static] Defines the value of the type property of a cut event object.
Event
 InheritedDEACTIVATE : String = "deactivate"
[static] The Event.DEACTIVATE constant defines the value of the type property of a deactivate event object.
Event
 InheritedAIR-only DISPLAYING : String = "displaying"
[static] The Event.DISPLAYING constant defines the value of the type property of a displaying event object.
Event
 InheritedENTER_FRAME : String = "enterFrame"
[static] The Event.ENTER_FRAME constant defines the value of the type property of an enterFrame event object.
Event
 InheritedEXIT_FRAME : String = "exitFrame"
[static] The Event.EXIT_FRAME constant defines the value of the type property of an exitFrame event object.
Event
 InheritedAIR-only EXITING : String = "exiting"
[static] The Event.EXITING constant defines the value of the type property of an exiting event object.
Event
 InheritedFRAME_CONSTRUCTED : String = "frameConstructed"
[static] The Event.FRAME_CONSTRUCTED constant defines the value of the type property of an frameConstructed event object.
Event
 InheritedFULLSCREEN : String = "fullScreen"
[static] The Event.FULL_SCREEN constant defines the value of the type property of a fullScreen event object.
Event
 InheritedAIR-only HTML_BOUNDS_CHANGE : String = "htmlBoundsChange"
[static] The Event.HTML_BOUNDS_CHANGE constant defines the value of the type property of an htmlBoundsChange event object.
Event
 InheritedAIR-only HTML_DOM_INITIALIZE : String = "htmlDOMInitialize"
[static] The Event.HTML_DOM_INITIALIZE constant defines the value of the type property of an htmlDOMInitialize event object.
Event
 InheritedAIR-only HTML_RENDER : String = "htmlRender"
[static] The Event.HTML_RENDER constant defines the value of the type property of an htmlRender event object.
Event
 InheritedID3 : String = "id3"
[static] The Event.ID3 constant defines the value of the type property of an id3 event object.
Event
 InheritedINIT : String = "init"
[static] The Event.INIT constant defines the value of the type property of an init event object.
Event
  ITEM_CLICK : String = "itemClick"
[static] The ListEvent.ITEM_CLICK constant defines the value of the type property of the ListEvent object for an itemClick event, which indicates that the user clicked the mouse over a visual item in the control.
ListEvent
  ITEM_DOUBLE_CLICK : String = "itemDoubleClick"
[static] The ListEvent.ITEM_DOUBLE_CLICK constant defines the value of the type property of the ListEvent object for an itemDoubleClick event, which indicates that the user double clicked the mouse over a visual item in the control.
ListEvent
  ITEM_EDIT_BEGIN : String = "itemEditBegin"
[static] The ListEvent.ITEM_EDIT_BEGIN constant defines the value of the type property of the event object for a itemEditBegin event, which indicates that an item is ready to be edited.
ListEvent
  ITEM_EDIT_BEGINNING : String = "itemEditBeginning"
[static] The ListEvent.ITEM_EDIT_BEGINNING constant defines the value of the type property of the ListEvent object for a itemEditBeginning event, which indicates that the user has prepared to edit an item, for example, by releasing the mouse button over the item.
ListEvent
  ITEM_EDIT_END : String = "itemEditEnd"
[static] The ListEvent.ITEM_EDIT_END constant defines the value of the type property of the ListEvent object for a itemEditEnd event, which indicates that an edit session is ending.
ListEvent
  ITEM_FOCUS_IN : String = "itemFocusIn"
[static] The ListEvent.ITEM_FOCUS_IN constant defines the value of the type property of the ListEvent object for an itemFocusIn event, which indicates that an item has received the focus.
ListEvent
  ITEM_FOCUS_OUT : String = "itemFocusOut"
[static] The ListEvent.ITEM_FOCUS_OUT constant defines the value of the type property of the ListEvent object for an itemFocusOut event, which indicates that an item has lost the focus.
ListEvent
  ITEM_ROLL_OUT : String = "itemRollOut"
[static] The ListEvent.ITEM_ROLL_OUT constant defines the value of the type property of the ListEvent object for an itemRollOut event, which indicates that the user rolled the mouse pointer out of a visual item in the control.
ListEvent
  ITEM_ROLL_OVER : String = "itemRollOver"
[static] The ListEvent.ITEM_ROLL_OVER constant defines the value of the type property of the ListEvent object for an itemRollOver event, which indicates that the user rolled the mouse pointer over a visual item in the control.
ListEvent
 InheritedAIR-only LOCATION_CHANGE : String = "locationChange"
[static] The Event.LOCATION_CHANGE constant defines the value of the type property of a locationChange event object.
Event
 InheritedMOUSE_LEAVE : String = "mouseLeave"
[static] The Event.MOUSE_LEAVE constant defines the value of the type property of a mouseLeave event object.
Event
 InheritedAIR-only NETWORK_CHANGE : String = "networkChange"
[static] The Event.NETWORK_CHANGE constant defines the value of the type property of a networkChange event object.
Event
 InheritedOPEN : String = "open"
[static] The Event.OPEN constant defines the value of the type property of an open event object.
Event
 InheritedPASTE : String = "paste"
[static] The Event.PASTE constant defines the value of the type property of a paste event object.
Event
 InheritedREMOVED : String = "removed"
[static] The Event.REMOVED constant defines the value of the type property of a removed event object.
Event
 InheritedREMOVED_FROM_STAGE : String = "removedFromStage"
[static] The Event.REMOVED_FROM_STAGE constant defines the value of the type property of a removedFromStage event object.
Event
 InheritedRENDER : String = "render"
[static] The Event.RENDER constant defines the value of the type property of a render event object.
Event
 InheritedRESIZE : String = "resize"
[static] The Event.RESIZE constant defines the value of the type property of a resize event object.
Event
 InheritedSCROLL : String = "scroll"
[static] The Event.SCROLL constant defines the value of the type property of a scroll event object.
Event
 InheritedSELECT : String = "select"
[static] The Event.SELECT constant defines the value of the type property of a select event object.
Event
 InheritedSELECT_ALL : String = "selectAll"
[static] The Event.SELECT_ALL constant defines the value of the type property of a selectAll event object.
Event
 InheritedSOUND_COMPLETE : String = "soundComplete"
[static] The Event.SOUND_COMPLETE constant defines the value of the type property of a soundComplete event object.
Event
 InheritedAIR-only STANDARD_ERROR_CLOSE : String = "standardErrorClose"
[static] The Event.STANDARD_ERROR_CLOSE constant defines the value of the type property of a standardErrorClose event object.
Event
 InheritedAIR-only STANDARD_INPUT_CLOSE : String = "standardInputClose"
[static] The Event.STANDARD_INPUT_CLOSE constant defines the value of the type property of a standardInputClose event object.
Event
 InheritedAIR-only STANDARD_OUTPUT_CLOSE : String = "standardOutputClose"
[static] The Event.STANDARD_OUTPUT_CLOSE constant defines the value of the type property of a standardOutputClose event object.
Event
 InheritedTAB_CHILDREN_CHANGE : String = "tabChildrenChange"
[static] The Event.TAB_CHILDREN_CHANGE constant defines the value of the type property of a tabChildrenChange event object.
Event
 InheritedTAB_ENABLED_CHANGE : String = "tabEnabledChange"
[static] The Event.TAB_ENABLED_CHANGE constant defines the value of the type property of a tabEnabledChange event object.
Event
 InheritedTAB_INDEX_CHANGE : String = "tabIndexChange"
[static] The Event.TAB_INDEX_CHANGE constant defines the value of the type property of a tabIndexChange event object.
Event
 InheritedUNLOAD : String = "unload"
[static] The Event.UNLOAD constant defines the value of the type property of an unload event object.
Event
 InheritedAIR-only USER_IDLE : String = "userIdle"
[static] The Event.USER_IDLE constant defines the value of the type property of a userIdle event object.
Event
 InheritedAIR-only USER_PRESENT : String = "userPresent"
[static] The Event.USER_PRESENT constant defines the value of the type property of a userPresent event object.
Event
Property Detail

columnIndex

property
public var columnIndex:int

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The zero-based index of the column that contains the item renderer where the event occurred.

itemRenderer

property 
public var itemRenderer:IListItemRenderer

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The item renderer where the event occurred. You can access the data provider item using this property.

reason

property 
public var reason:String

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The reason the itemEditEnd event was dispatched. Valid only for events with type ITEM_EDIT_END. The possible values are defined in the ListEventReason class.

See also

rowIndex

property 
public var rowIndex:int

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

In the zero-based index of the row that contains the item renderer where the event occured, or for editing events, the index of the item in the data provider that is being edited.

Constructor Detail

ListEvent

()Constructor
public function ListEvent(type:String, bubbles:Boolean = false, cancelable:Boolean = false, columnIndex:int = -1, rowIndex:int = -1, reason:String = null, itemRenderer:IListItemRenderer = null)

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

Constructor. Normally called by the Flex control and not used in application code.

Parameters
type:String — The event type; indicates the action that caused the event.
 
bubbles:Boolean (default = false) — Specifies whether the event can bubble up the display list hierarchy.
 
cancelable:Boolean (default = false) — Specifies whether the behavior associated with the event can be prevented.
 
columnIndex:int (default = -1) — The zero-based index of the column that contains the renderer.
 
rowIndex:int (default = -1) — The zero-based index of the row that contains the renderer, or for editing events, the index of the item in the data provider that is being edited
 
reason:String (default = null) — The reason for an itemEditEnd event.
 
itemRenderer:IListItemRenderer (default = null) — The item renderer for the data provider item.
Constant Detail

CHANGE

Constant
public static const CHANGE:String = "change"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.CHANGE constant defines the value of the type property of the ListEvent object for a change event, which indicates that selection changed as a result of user interaction.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item renderer that was clicked.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.CHANGE

ITEM_CLICK

Constant 
public static const ITEM_CLICK:String = "itemClick"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_CLICK constant defines the value of the type property of the ListEvent object for an itemClick event, which indicates that the user clicked the mouse over a visual item in the control.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item renderer that was clicked.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_CLICK

ITEM_DOUBLE_CLICK

Constant 
public static const ITEM_DOUBLE_CLICK:String = "itemDoubleClick"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_DOUBLE_CLICK constant defines the value of the type property of the ListEvent object for an itemDoubleClick event, which indicates that the user double clicked the mouse over a visual item in the control.

To receive itemDoubleClick events, you must set the component's doubleClickEnabled property to true.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item renderer that was double clicked.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_DOUBLE_CLICK

ITEM_EDIT_BEGIN

Constant 
public static const ITEM_EDIT_BEGIN:String = "itemEditBegin"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_EDIT_BEGIN constant defines the value of the type property of the event object for a itemEditBegin event, which indicates that an item is ready to be edited.

The default listener for this event performs the following actions:

  • Creates an item editor object via a call to the createItemEditor() method.
  • Copies the data property from the item to the editor. By default, the item editor object is an instance of the TextInput control. You use the itemEditor property of the list control to specify a custom item editor class.
  • Set the itemEditorInstance property of the list control to reference the item editor instance.

You can write an event listener for this event to modify the data passed to the item editor. For example, you might modify the data, its format, or other information used by the item editor.

You can also create an event listener to specify the item editor used to edit the item. For example, you might have two different item editors. Within the event listener you can examine the data to be edited or other information, and open the appropriate item editor by doing the following:

  1. Call preventDefault() to stop Flex from calling the createItemEditor() method as part of the default event listener.
  2. Set the itemEditor property to the appropriate editor.
  3. Call the createItemEditor() method.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelabletrue
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item renderer for the item that is being edited.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_EDIT_BEGIN

ITEM_EDIT_BEGINNING

Constant 
public static const ITEM_EDIT_BEGINNING:String = "itemEditBeginning"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_EDIT_BEGINNING constant defines the value of the type property of the ListEvent object for a itemEditBeginning event, which indicates that the user has prepared to edit an item, for example, by releasing the mouse button over the item.

The default listener for this event sets the List.editedItemPosition property to the item that has focus, which starts the item editing session.

You typically write your own event listener for this event to disallow editing of a specific item or items. Calling the preventDefault() method from within your own event listener for this event prevents the default listener from executing.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelabletrue
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item renderer for the item that will be edited. This property is null if this event is generated by keyboard, as the item to be edited may be off-screen.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_EDIT_BEGIN

ITEM_EDIT_END

Constant 
public static const ITEM_EDIT_END:String = "itemEditEnd"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_EDIT_END constant defines the value of the type property of the ListEvent object for a itemEditEnd event, which indicates that an edit session is ending.

The list components have a default handler for this event that copies the data from the item editor to the data provider of the list control. The default event listener performs the following actions:

  • Uses the editorDataField property of the list control to determine the property of the item editor containing the new data and updates the data provider item with that new data. Since the default item editor is the TextInput control, the default value of the editorDataField property is "text", to specify that the text property of the TextInput contains the new item data.
  • Calls the destroyItemEditor() method to close the item editor.

You typically write an event listener for this event to perform the following actions:

  • In your event listener, you can modify the data returned by the editor to the list component. For example, you can reformat the data before returning it to the list control. By default, an item editor can only return a single value. You must write an event listener for the itemEditEnd event if you want to return multiple values.
  • In your event listener, you can examine the data entered into the item editor. If the data is incorrect, you can call the preventDefault() method to stop Flex from passing the new data back to the list control and from closing the editor.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelabletrue
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item renderer for the item that was edited.
reasonA constant defining the reason for the event. The value must be a member of the ListEventReson class.
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_EDIT_END

ITEM_FOCUS_IN

Constant 
public static const ITEM_FOCUS_IN:String = "itemFocusIn"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_FOCUS_IN constant defines the value of the type property of the ListEvent object for an itemFocusIn event, which indicates that an item has received the focus.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelabletrue
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item editor instance for the item that is being edited.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_FOCUS_IN

ITEM_FOCUS_OUT

Constant 
public static const ITEM_FOCUS_OUT:String = "itemFocusOut"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_FOCUS_OUT constant defines the value of the type property of the ListEvent object for an itemFocusOut event, which indicates that an item has lost the focus.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item editor instance for the item that was being edited.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_FOCUS_OUT

ITEM_ROLL_OUT

Constant 
public static const ITEM_ROLL_OUT:String = "itemRollOut"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_ROLL_OUT constant defines the value of the type property of the ListEvent object for an itemRollOut event, which indicates that the user rolled the mouse pointer out of a visual item in the control.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item renderer that was rolled out.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_ROLL_OUT

ITEM_ROLL_OVER

Constant 
public static const ITEM_ROLL_OVER:String = "itemRollOver"

Language Version: ActionScript 3.0
Product Version: Flex 3
Runtime Versions: Flash Player 9, AIR 1.1

The ListEvent.ITEM_ROLL_OVER constant defines the value of the type property of the ListEvent object for an itemRollOver event, which indicates that the user rolled the mouse pointer over a visual item in the control.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
columnIndex The zero-based index of the column associated with the event.
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
itemRendererThe item renderer that was rolled over.
reasonnull
rowIndexThe zero-based index of the item associated with the event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.
TypeListEvent.ITEM_ROLL_OVER