| Package | mx.effects |
| Class | public class Zoom |
| Inheritance | Zoom  TweenEffect Effect EventDispatcher Object |
| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 3 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
 | Starting with Flex 4.0, Adobe recommends that you use the spark.effects.Scale class as an alternative to this class. |
The Zoom effect zooms the object in or out on a center point.
When you apply a Zoom effect to text rendered using a system font, Flex scales the text between whole point sizes. While you do not have to use embedded fonts when you apply a Zoom effect to text, the Zoom will appear smoother when you apply it to embedded fonts.
Note: The Zoom effect does not work when the
Container.autoLayout property is false.
Show MXML Syntax
Hide MXML SyntaxThe <mx:Zoom> tag
inherits all of the tag attributes of its superclass,
and adds the following tag attributes:
<mx:Zoom
id="ID"
captureRollEvents="false|true"
originX="Calculated"
originY="Calculated"
zoomWidthFrom="0.01"
zoomWidthTo="1.0"
zoomHeightFrom="0.01"
zoomHeightTo="1.0"
/>
Learn more
Related API Elements
| Property | Defined By | ||
|---|---|---|---|
| captureRollEvents : Boolean
If true, prevents Flex from dispatching the rollOut
and rollOver events if the mouse has not moved. | Zoom | ||
 | className : String [read-only]
The name of the effect class, such as "Fade". | Effect | |
| constructor : Object
A reference to the class object or constructor function for a given object instance. | Object | |
| customFilter : mx.effects:EffectTargetFilter
Specifies a custom filter object, of type EffectTargetFilter,
used by the effect to determine the targets
on which to play the effect. | Effect | |
| duration : Number
Duration of the effect in milliseconds. | Effect | |
| easingFunction : Function = null
The easing function for the animation. | TweenEffect | |
| effectTargetHost : mx.effects:IEffectTargetHost
A property that lets you access the target list-based control
of a data effect. | Effect | |
| filter : String
Specifies an algorithm for filtering targets for an effect. | Effect | |
| hideFocusRing : Boolean
Determines whether the effect should hide the focus ring
when starting the effect. | Effect | |
| instanceClass : Class
An object of type Class that specifies the effect
instance class class for this effect class. | Effect | |
| isPlaying : 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 | |
| originX : Number
Number that represents the x-position of the zoom origin
when the effect target is in a container that supports absolute positioning,
such as the Canvas container. | Zoom | ||
| originY : Number
Number that represents the y-position of the zoom origin
when the effect target is in a container that supports absolute positioning,
such as the Canvas container. | Zoom | ||
| perElementOffset : Number
Additional delay, in milliseconds, for effect targets
after the first target of the effect. | Effect | |
| playheadTime : Number
Current time position of the effect. | Effect | |
| prototype : Object [static]
A reference to the prototype object of a class or function object. | Object | |
| relevantProperties : Array
An Array of property names to use when performing filtering. | Effect | |
| relevantStyles : Array
An Array of style names to use when performing filtering. | Effect | |
| repeatCount : int = 1
Number of times to repeat the effect. | Effect | |
| repeatDelay : int = 0
Amount of time, in milliseconds, to wait before repeating the effect. | Effect | |
| startDelay : int = 0
Amount of time, in milliseconds, to wait before starting the effect. | Effect | |
| suspendBackgroundProcessing : Boolean = false
If true, blocks all background processing
while the effect is playing. | Effect | |
| target : Object
The object to which this effect is applied. | Effect | |
| targets : Array
An Array of objects that are targets for the effect. | Effect | |
| triggerEvent : 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 | |
| zoomHeightFrom : Number
Number that represents the scale at which to start the height zoom,
as a percent between 0.01 and 1.0. | Zoom | ||
| zoomHeightTo : Number
Number that represents the scale at which to complete the height zoom,
as a percent between 0.01 and 1.0. | Zoom | ||
| zoomWidthFrom : Number
Number that represents the scale at which to start the width zoom,
as a percent between 0.01 and 1.0. | Zoom | ||
| zoomWidthTo : Number
Number that represents the scale at which to complete the width zoom,
as a percent between 0.01 and 1.0. | Zoom | ||
| Method | Defined By | ||
|---|---|---|---|
Constructor. | Zoom | ||
| 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 | |
|
Captures the current values of the relevant properties
on the effect's targets and saves them as end values. | Effect | |
|
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 | |
|
Captures the current values of the relevant properties
on the effect's targets. | Effect | |
|
Creates a single effect instance and initializes it. | Effect | |
|
Takes an Array of target objects and invokes the
createInstance() method on each target. | Effect | |
|
Removes event listeners from an instance
and removes it from the list of instances. | Effect | |
|
Dispatches an event into the event flow. | EventDispatcher | |
|
Interrupts an effect that is currently playing,
and jumps immediately to the end of the effect. | Effect | |
|
Returns an Array of Strings, where each String is the name
of a property changed by this effect. | Effect | |
|
Checks whether the EventDispatcher object has any listeners registered for a specific type
of event. | EventDispatcher | |
|
Indicates whether an object has a specified property defined. | Object | |
|
Indicates whether an instance of the Object class is in the prototype chain of the object specified
as the parameter. | Object | |
|
Pauses the effect until you call the resume() method. | Effect | |
|
Begins playing the effect. | Effect | |
|
Indicates whether the specified property exists and is enumerable. | Object | |
|
Removes a listener from the EventDispatcher object. | EventDispatcher | |
|
Resumes the effect after it has been paused
by a call to the pause() method. | Effect | |
|
Plays the effect in reverse, if the effect is currently playing,
starting from the current position of the effect. | Effect | |
|
Sets the availability of a dynamic property for loop operations. | Object | |
|
Stops the effect, leaving the effect targets in their current state. | Effect | |
|
Returns the string representation of this object, formatted according to locale-specific conventions. | Object | |
|
Returns the string representation of the specified object. | Object | |
|
Returns the primitive value of the specified object. | Object | |
|
Checks whether an event listener is registered with this EventDispatcher object or any of
its ancestors for the specified event type. | EventDispatcher | |
captureRollEvents | property |
public var captureRollEvents:Boolean| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 3 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
If true, prevents Flex from dispatching the rollOut
and rollOver events if the mouse has not moved.
Set this property to true when you use the Zoom effect to
toggle the effect target between a big and small size.
For example, you use the rollOverEffect to trigger
the Zoom effect to reduce the size of the target.
As the target shrinks, the mouse pointer is no longer over the target,
triggering a rollOut event, and
the corresponding rollOutEffect. By setting
the captureRollEvents property to true,
you prevent Flex from dispatching the rollOut event
unless it occurs because you moved the mouse.
The default value is false.
originX | property |
public var originX:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 3 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
Number that represents the x-position of the zoom origin when the effect target is in a container that supports absolute positioning, such as the Canvas container. The zoom origin is the position on the target around which the Zoom effect is centered.
The value must be between 0 and the width of the target component.
The default value istarget.width / 2, which is the center of the target.
originY | property |
public var originY:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 3 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
Number that represents the y-position of the zoom origin when the effect target is in a container that supports absolute positioning, such as the Canvas container. The zoom origin is the position on the target around which the Zoom effect is centered.
The value must be between 0 and the height of the target component.
The default value istarget.height / 2, which is the center of the target.
zoomHeightFrom | property |
public var zoomHeightFrom:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 3 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
Number that represents the scale at which to start the height zoom, as a percent between 0.01 and 1.0. The default value is 0.01, which is very small.
zoomHeightTo | property |
public var zoomHeightTo:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 3 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
Number that represents the scale at which to complete the height zoom, as a percent between 0.01 and 1.0. The default value is 1.0, which is the object's normal size.
zoomWidthFrom | property |
public var zoomWidthFrom:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 3 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
Number that represents the scale at which to start the width zoom, as a percent between 0.01 and 1.0. The default value is 0.01, which is very small.
zoomWidthTo | property |
public var zoomWidthTo:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 3 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
Number that represents the scale at which to complete the width zoom, as a percent between 0.01 and 1.0. The default value is 1.0, which is the object's normal size.
Zoom | () | Constructor |
<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate the Zoom effect. -->
<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 flash.events.MouseEvent;
public function doZoom(event:MouseEvent):void {
if (zoomAll.isPlaying) {
zoomAll.reverse();
}
else {
// If this is a ROLL_OUT event, play the effect backwards.
// If this is a ROLL_OVER event, play the effect forwards.
zoomAll.play([event.target], event.type == MouseEvent.ROLL_OUT ? true : false);
}
}
]]>
</fx:Script>
<fx:Declarations>
<mx:Zoom id="zoomAll" zoomWidthTo="1" zoomHeightTo="1" zoomWidthFrom=".5" zoomHeightFrom=".5" />
</fx:Declarations>
<s:Panel title="Zoom Effect Example" width="95%" height="95%" >
<s:VGroup left="20" right="20" top="20" bottom="20">
<s:Label width="100%" color="blue"
text="Move the mouse over the image to enlarge it. Move the mouse off of the image to shrink it."/>
<mx:Image id="img"
source="@Embed(source='assets/Nokia_6630.png')"
scaleX=".5" scaleY=".5"
rollOver="doZoom(event)"
rollOut="doZoom(event)"/>
</s:VGroup>
</s:Panel>
</s:Application>
Mon Nov 28 2011, 06:48 AM -08:00