The ListCollectionView class adds the properties and methods of the
ICollectionView interface to an object that conforms to the
IList interface. As a result, you can pass an object of this class
to anything that requires an IList or ICollectionView.
This class also lets you use [ ] array notation
to access the getItemAt() and setItemAt() methods.
If you use code such as myListCollectionView[index]
Flex calls the myListCollectionView object's
getItemAt() or setItemAt() method.
When the view is sorted or filtered the localIndex property
contains an array of items in the sorted or filtered (ordered, reduced)
view, in the sorted order.
A function that the view will use to eliminate items that do not
match the function's criteria.
A filterFunction is expected to have the following signature:
f(item:Object):Boolean
where the return value is true if the specified item
should remain in the view.
If a filter is unsupported, Flex throws an error when accessing
this property.
You must call refresh() after setting the
filterFunction property for the view to update.
Note: The Flex implementations of ICollectionView retrieve all
items from a remote location before executing the filter function.
If you use paging, apply the filter to the remote collection before
you retrieve the data.
This property can be used as the source for data binding.
Implementation public function get filterFunction():Function public function set filterFunction(value:Function):void
This property can be used as the source for data binding.
Implementation public function get list():IList public function set list(value:IList):void
localIndex
property
protected var localIndex:Array
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
When the view is sorted or filtered the localIndex property
contains an array of items in the sorted or filtered (ordered, reduced)
view, in the sorted order.
The ListCollectionView class uses this property to access the items in
the view.
The localIndex property should never contain anything
that is not in the source, but may not have everything in the source.
This property is null when there is no sort.
The ISort that will be applied to the ICollectionView.
Setting the sort does not automatically refresh the view,
so you must call the refresh() method
after setting this property.
If sort is unsupported an error will be thrown when accessing
this property.
Note: The Flex implementations of ICollectionView retrieve all
items from a remote location before executing a sort.
If you use paging with a sorted list, apply the sort to the remote
collection before you retrieve the data.
This property can be used as the source for data binding.
Implementation public function get sort():ISort public function set sort(value:ISort):void
Adds a list of items to the current list, placing them at the end of
the list in the order they are passed.
Parameters
addList:IList — IList The list of items to add to the current list
addAllAt
()
method
public function addAllAt(addList:IList, index:int):void
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Adds a list of items to the current list, placing them at the position
index passed in to the function. The items are placed at the index location
and placed in the order they are recieved.
Parameters
addList:IList — IList The list of items to add to the current list
index:int — The location of the current list to place the new items.
Throws
RangeError — if index is less than 0 or greater than the length of the list.
addEventListener
()
method
public function addEventListener(eventType:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Parameters
eventType:String
listener:Function
useCapture:Boolean (default = false)
priority:int (default = 0)
useWeakReference:Boolean (default = false)
addItem
()
method
public function addItem(item:Object):void
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Adds the specified item to the end of the list.
Equivalent to addItemAt(item, length).
Parameters
item:Object — The item to add.
addItemAt
()
method
public function addItemAt(item:Object, index:int):void
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Adds the item at the specified index.
The index of any item greater than the index of the added item is increased by one.
If the the specified index is less than zero or greater than the length
of the list, a RangeError is thrown.
Parameters
item:Object — The item to place at the index.
index:int — The index at which to place the item.
contains
()
method
public function contains(item:Object):Boolean
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Returns whether the view contains the specified object.
Unlike the IViewCursor.findxxx methods,
this search is succesful only if it finds an item that exactly
matches the parameter.
If the view has a filter applied to it this method may return
false even if the underlying collection
does contain the item.
Parameters
item:Object — The object to look for.
Returns
Boolean — true if the ICollectionView, after applying any filter,
contains the item; false otherwise.
Prevents changes to the collection itself and items within the
collection from being dispatched by the view.
Also prevents the view from updating the positions of items
if the positions change in the collection.
The changes will be queued and dispatched appropriately
after enableAutoUpdate is called.
If more events than updates to a single item occur,
the view may end up resetting.
The disableAutoUpdate method acts cumulatively;
the same number of calls to enableAutoUpdate
are required for the view to dispatch events and refresh.
Note that disableAutoUpdate only affects the
individual view; edits may be detected on an individual
basis by other views.
public function getItemAt(index:int, prefetch:int = 0):Object
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Gets the item at the specified index.
Parameters
index:int — The index in the list from which to retrieve the item.
prefetch:int (default = 0) — An int indicating both the direction
and number of items to fetch during the request if the item is
not local.
Returns
Object — The item at that index, or null if there is none.
getItemIndex
()
method
public function getItemIndex(item:Object):int
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Returns the index of the item if it is in the list such that
getItemAt(index) == item.
Note: unlike IViewCursor.findxxx() methods,
The getItemIndex() method cannot take a parameter with
only a subset of the fields in the item being serched for;
this method always searches for an item that exactly matches
the input parameter.
Parameters
item:Object — The item to find.
Returns
int — The index of the item, or -1 if the item is not in the list.
hasEventListener
()
method
public function hasEventListener(eventType:String):Boolean
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Parameters
eventType:String
Returns
Boolean
initialized
()
method
public function initialized(document:Object, id:String):void
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Called automatically by the MXML compiler when the ListCollectionView
is created using an MXML tag.
If you create the ListCollectionView through ActionScript, you
must call this method passing in the MXML document and
null for the id.
Parameters
document:Object — The MXML document containing this ListCollectionView.
id:String — Ignored.
itemUpdated
()
method
public function itemUpdated(item:Object, property:Object = null, oldValue:Object = null, newValue:Object = null):void
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Notifies the view that an item has been updated.
This method is useful if the contents of the view do not implement
IPropertyChangeNotifier.
If the call to this method includes a property parameter,
the view may be able to optimize its notification mechanism.
Otherwise it may choose to simply refresh the whole view.
Parameters
item:Object — The item within the view that was updated.
property:Object (default = null) — The name of the property that was updated.
oldValue:Object (default = null) — The old value of that property. (If property
was null, this can be the old value of the item.).
newValue:Object (default = null) — The new value of that property. (If property
was null, there's no need to specify this as the item is assumed
to be the new value.)
Applies the sort and filter to the view.
The ICollectionView does not detect changes to a sort or
filter automatically, so you must call the refresh()
method to update the view after setting the sort
or filterFunction property.
If your ICollectionView implementation also implements
the IMXMLObject interface, you should to call the
refresh() method from your initialized()
method.
Returns true if the refresh was successful
and false if the sort is not yet complete
(e.g., items are still pending).
A client of the view should wait for a CollectionEvent event
with the CollectionEventKind.REFRESHkind
property to ensure that the refresh() operation is
complete.
Returns
Boolean — true if the refresh() was complete,
false if the refresh() is incomplete.
removeAll
()
method
public function removeAll():void
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Remove all items from the list.
removeEventListener
()
method
public function removeEventListener(eventType:String, listener:Function, useCapture:Boolean = false):void
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Parameters
eventType:String
listener:Function
useCapture:Boolean (default = false)
removeItem
()
method
public function removeItem(item:Object):Boolean
Language Version :
ActionScript 3.0
Product Version :
Apache Flex
Runtime Versions :
Flash Player 9, AIR 1.1
Removes the specified item from this list, should it exist.
Relies on ArrayList implementation
Parameters
item:Object — Object reference to the item that should be removed.
Returns
Boolean — Boolean indicating if the item was removed.
removeItemAt
()
method
public function removeItemAt(index:int):Object
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Removes the item at the specified index and returns it.
Any items that were after this index are now one index earlier.
Parameters
index:int — The index from which to remove the item.
Returns
Object — The item that was removed.
setItemAt
()
method
public function setItemAt(item:Object, index:int):Object
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Places the item at the specified index.
If an item was already at that index the new item will replace it
and it will be returned.
Parameters
item:Object — The new item to be placed at the specified index.
index:int — The index at which to place the item.
Returns
Object — The item that was replaced, or null if none.
toArray
()
method
public function toArray():Array
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Returns an Array that is populated in the same order as the IList
implementation.
This method can throw an ItemPendingError.
Returns
Array — The array.
toString
()
method
public function toString():String
Language Version :
ActionScript 3.0
Product Version :
Flex 3
Runtime Versions :
Flash Player 9, AIR 1.1
Prints the contents of this view to a string and returns it.
Returns
String — The contents of this view, in string form.
willTrigger
()
method
public function willTrigger(eventType:String):Boolean
Dispatched when the ICollectionView has been updated in some way.
The CollectionEvent.COLLECTION_CHANGE constant defines the value of the
type property of the event object for an event that is
dispatched when a collection has changed.
The properties of the event object have the following values.
Not all properties are meaningful for all kinds of events.
See the detailed property descriptions for more information.
Property
Value
bubbles
false
cancelable
false
currentTarget
The 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.
items
An Array of objects with
information about the items affected by the event.
The contents of this field depend on the event kind;
for details see the items property
kind
The kind of event.
The valid values are defined in the CollectionEventKind
class as constants.
location
Location within the target collection
of the item(s) specified in the items property.
oldLocation
the previous location in the collection
of the item specified in the items property.
target
The 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.
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