Adobe® Flex® 4 Language Reference
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mx.effects 
DefaultListEffect 
Packagemx.effects
Classpublic class DefaultListEffect
InheritanceDefaultListEffect Inheritance Parallel Inheritance CompositeEffect Inheritance Effect Inheritance EventDispatcher Inheritance Object

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

The DefaultListEffect class defines the default effect applied to the item renderers of a List control when the data in the data provider changes. When an item in the List control is removed, this effect first fades out the item, then collapses the size of the item to 0. When you add an item to the List control, this effect expands the slot for the item, then fades in the new item.

You use the itemsChangeEffect style property to apply this effect to a List control. The default value of the itemsChangeEffect style property is undefined, meaning it does not use any effect.

Because the DefaultListEffect effect grows and shrinks item renderers as it plays, you must set the List.variableRowHeight property to true to enable the List control to dynalically change its row height.

MXML SyntaxexpandedHide MXML Syntax

The <mx:DefaultListEffect> tag inherits all the members of its parent and adds the following members:

  <DefaultListEffect
    Properties
    color="0xFFFFFF"
    fadeInDuration="300"
    fadeOutDuration="300"
    growDuration="300"
    removedElementOffset="100"
    shrinkDuration="300"
  />
  

Default MXML Propertychildren

View the examples

See also



Public Properties
 PropertyDefined By
 InheritedclassName : String
[read-only] The name of the effect class, such as "Fade".
Effect
  color : Number
Hex value that represents the color used when fading the added and removed item.
DefaultListEffect
 InheritedcompositeDuration : Number
[override] [read-only] Returns the duration of this effect as defined by the duration of all child effects.
Parallel
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
  fadeInDuration : Number
The duration, in milliseconds, for fading in renderers for added and removed items.
DefaultListEffect
  fadeOutDuration : Number
The duration, in milliseconds, used for fading out renderers for added and removed items.
DefaultListEffect
  growDuration : Number
The duration, in milliseconds, applied to renderers for added and removed items.
DefaultListEffect
 InheritedhideFocusRing : Boolean
Determines whether the effect should hide the focus ring when starting the effect.
Effect
 InheritedinstanceClass : Class
An object of type Class that specifies the effect instance class class for this effect class.
Effect
 InheritedisPlaying : Boolean
[read-only] A read-only flag which is true if any instances of the effect are currently playing, and false if none are.
Effect
 InheritedplayheadTime : Number
Current time position of the effect.
Effect
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
 InheritedrelevantProperties : Array
An Array of property names to use when performing filtering.
Effect
 InheritedrelevantStyles : Array
An Array of style names to use when performing filtering.
Effect
  removedElementOffset : Number
The offset in milliseconds between the effects applied to the renderers representing multiple items deleted at the same time.
DefaultListEffect
  shrinkDuration : Number
The duration, in milliseconds, applied to renderers for added and removed items.
DefaultListEffect
 InheritedstartDelay : int = 0
Amount of time, in milliseconds, to wait before starting the effect.
Effect
 InheritedsuspendBackgroundProcessing : Boolean = false
If true, blocks all background processing while the effect is playing.
Effect
 InheritedtriggerEvent : Event
The Event object passed to this Effect by the EffectManager when an effect is triggered, or null if the effect is not being played by the EffectManager.
Effect
Protected Properties
 PropertyDefined By
 InheritedapplyTransitionEndProperties : Boolean
This flag controls whether the effect, when run in a transition, automatically applies the property values according to the end state, as opposed to leaving values as set by the effect itself.
Effect
 InheritedendValuesCaptured : Boolean = false
A flag containing true if the end values of an effect have already been determined, or false if they should be acquired from the current properties of the effect targets when the effect runs.
Effect
Public Methods
 MethodDefined By
  
Constructor.
DefaultListEffect
 Inherited
addChild(childEffect:IEffect):void
Adds a new child effect to this composite effect.
CompositeEffect
 Inherited
addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.
EventDispatcher
 Inherited
Captures the current values of the relevant properties on the effect's targets and saves them as end values.
Effect
 Inherited
Captures the current values of the relevant properties of an additional set of targets Flex uses this function when a data change effect is run.
Effect
 Inherited
Captures the current values of the relevant properties on the effect's targets.
Effect
 Inherited
Creates a single effect instance and initializes it.
Effect
 Inherited
createInstances(targets:Array = null):Array
Takes an Array of target objects and invokes the createInstance() method on each target.
Effect
 Inherited
Removes event listeners from an instance and removes it from the list of instances.
Effect
 Inherited
Dispatches an event into the event flow.
EventDispatcher
 Inherited
end(effectInstance:IEffectInstance = null):void
Interrupts an effect that is currently playing, and jumps immediately to the end of the effect.
Effect
 Inherited
Returns an Array of Strings, where each String is the name of a property changed by this effect.
Effect
 Inherited
Checks whether the EventDispatcher object has any listeners registered for a specific type of event.
EventDispatcher
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Pauses the effect until you call the resume() method.
Effect
 Inherited
play(targets:Array = null, playReversedFromEnd:Boolean = false):Array
Begins playing the effect.
Effect
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void
Removes a listener from the EventDispatcher object.
EventDispatcher
 Inherited
Resumes the effect after it has been paused by a call to the pause() method.
Effect
 Inherited
Plays the effect in reverse, if the effect is currently playing, starting from the current position of the effect.
Effect
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Stops the effect, leaving the effect targets in their current state.
Effect
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
 Inherited
Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.
EventDispatcher
Protected Methods
 MethodDefined By
 Inherited
applyValueToTarget(target:Object, property:String, value:*, props:Object):void
Used internally by the Effect infrastructure.
Effect
 Inherited
Called when an effect instance has finished playing.
Effect
 Inherited
This method is called when the effect instance starts playing.
Effect
 Inherited
Called when an effect instance has stopped by a call to the stop() method.
Effect
 Inherited
filterInstance(propChanges:Array, target:Object):Boolean
Determines the logic for filtering out an effect instance.
Effect
 Inherited
getValueFromTarget(target:Object, property:String):*
Called by the captureStartValues() method to get the value of a property from the target.
Effect
 Inherited
Copies properties of the effect to the effect instance.
Effect
Events
 Event Summary Defined By
 Inherited[broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.EventDispatcher
 Inherited[broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.EventDispatcher
 InheritedDispatched when one of the effect's instances finishes playing, either when the instance finishes playing or when the effect is interrupted by a call to the end() method.Effect
 InheritedDispatched when the effect starts playing.Effect
 InheritedDispatched when the effect has been stopped, which only occurs when the effect is interrupted by a call to the stop() method.Effect
Property Detail

color

property
color:Number

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

Hex value that represents the color used when fading the added and removed item.

The default value is 0xFFFFFF.



Implementation
    public function get color():Number
    public function set color(value:Number):void

fadeInDuration

property 
fadeInDuration:Number

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

The duration, in milliseconds, for fading in renderers for added and removed items.

The default value is 300.



Implementation
    public function get fadeInDuration():Number
    public function set fadeInDuration(value:Number):void

fadeOutDuration

property 
fadeOutDuration:Number

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

The duration, in milliseconds, used for fading out renderers for added and removed items.

The default value is 300.



Implementation
    public function get fadeOutDuration():Number
    public function set fadeOutDuration(value:Number):void

growDuration

property 
growDuration:Number

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

The duration, in milliseconds, applied to renderers for added and removed items.

The default value is 300.



Implementation
    public function get growDuration():Number
    public function set growDuration(value:Number):void

removedElementOffset

property 
removedElementOffset:Number

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

The offset in milliseconds between the effects applied to the renderers representing multiple items deleted at the same time. If 0, all renderers will fade and shrink simultaneously.

The default value is 100.



Implementation
    public function get removedElementOffset():Number
    public function set removedElementOffset(value:Number):void

shrinkDuration

property 
shrinkDuration:Number

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

The duration, in milliseconds, applied to renderers for added and removed items.

The default value is 300.



Implementation
    public function get shrinkDuration():Number
    public function set shrinkDuration(value:Number):void
Constructor Detail

DefaultListEffect

()Constructor
public function DefaultListEffect()

Constructor.

DefaultListEffectExample.mxml
<?xml version="1.0"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">

    <fx:Script>
        <![CDATA[
            import mx.effects.DefaultListEffect;
            import mx.collections.ArrayCollection;

            [Bindable]
            private var myDP:ArrayCollection = new ArrayCollection(
                ['A','B','C','D','E','F','G','H']);

            private function deleteItem():void {
                // As each item is removed, the index of the other items changes.
                // So first get the items to delete, then determine their indices
                // as you remove them.
                var toRemove:Array = [];
                for (var i:int = 0; i < list0.selectedItems.length; i++)
                    toRemove.push(list0.selectedItems[i]);
                for (i = 0; i < toRemove.length; i++)
                    myDP.removeItemAt(myDP.getItemIndex(toRemove[i]));
            }

            private var zcount:int = 0;
            private function addItem():void {
                // Always add the new item after the third item,
                // or after the last item if the length is less than 3.
                myDP.addItemAt("Z"+zcount++,Math.min(3,myDP.length));
            }
        ]]>
    </fx:Script>

    <!-- Define an instance of the DefaultListEffect effect,
         and set its fadeOutDuration and color properties. -->
    <fx:Declarations>
        <mx:DefaultListEffect id="myDLE"
            fadeOutDuration="1000"
            color="0x0000ff"/>
    </fx:Declarations>

    <s:Panel title="Halo DefaultListEffect Example" width="75%" height="75%" >
        <s:VGroup left="20" right="20" top="20" bottom="20">

            <mx:List id="list0"
                width="150"
                dataProvider="{myDP}"
                variableRowHeight="true"
                fontSize="18"
                allowMultipleSelection="true"
                itemsChangeEffect="{myDLE}"/>

            <s:Button
                label="Delete item"
                click="deleteItem();"/>
            <s:Button
                label="Add item"
                click="addItem();"/>
        </s:VGroup>

    </s:Panel>
</s:Application>