Keyframe

Pacote	spark.effects.animation
Classe	public class Keyframe
Herança	Keyframe Object

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 4

Versões de runtime:

Flash Player 10, AIR 1.5

The Keyframe class defines the value of a property at a specific time during an effect. For example, you can create three keyframes that define the value of a property at the beginning of the effect, at the midpoint of the effect, and at the end of the effect. The effect animates the property change on the target from keyframe to keyframe over the effect duration.

The collection of keyframes for an effect is called the effect's motion path. A motion path can define any number of keyframes. The effect then calculates the value of the property by interpolating between the values specified by two key frames.

Use the MotionPath class to hold the collection of Keyframe objects that represent the motion path of the effect. The MotionPath class specifies the name of the property on the target, and the collection of Keyframes objects specify the values of the property at different times during the effect.

Sintaxe MXML expanded

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The <s:Keyframe> tag inherits the tag attributes of its superclass, and adds the following tag attributes:

  <s:Keyframe 
    id="ID"
    easier="Linear"
    time="val"
    value="val"
    valueBy="val"
  />

Veja os exemplos

Mais exemplos

Applying an effect using keyframes and motion paths

Elementos da API relacionados

MotionPath

Propriedades públicas

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	Propriedade		Definido por
		constructor : Object Uma referência ao objeto de classe ou à função de construtor de uma determinada ocorrência de objeto.	Object
		easer : IEaser The easing behavior applied to the motion between the previous Keyframe object in motion path and this Keyframe object.	Keyframe
		time : Number The time, in milliseconds, at which the effect target for this keyframe should have the value specified by the value property.	Keyframe
		value : Object The value that the property of the effect target should have at the time specified by the time property.	Keyframe
		valueBy : Object Optional parameter which, if specified, is used to calculate value in this keyframe or the previous one.	Keyframe

Métodos públicos

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	Método		Definido por
		Keyframe(time:Number = NaN, value:Object = null, valueBy:Object = null) Constructor.	Keyframe
		clone():Keyframe Returns a copy of this Keyframe object.	Keyframe
		hasOwnProperty(name:String):Boolean Indica se um objeto tem uma propriedade especificada definida.	Object
		isPrototypeOf(theClass:Object):Boolean Indica se uma ocorrência da classe Object está na cadeia de protótipos do objeto especificado como o parâmetro.	Object
		propertyIsEnumerable(name:String):Boolean Indica se a propriedade especificada existe e é enumerável.	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Define a disponibilidade de uma propriedade dinâmica para operações de repetição.	Object
		toLocaleString():String Retorna a representação da string deste objeto, formatado segundo as convenções específicas para a localidade.	Object
		toString():String Retorna a representação de string do objeto especificado.	Object
		valueOf():Object Retorna o valor primitivo do objeto especificado.	Object

Detalhes da propriedade

easer

propriedade

public var easer:IEaser

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 4

Versões de runtime:

Flash Player 10, AIR 1.5

The easing behavior applied to the motion between the previous Keyframe object in motion path and this Keyframe object. By default, the easing is linear, or no easing at all.

Note that the parent effect might have easing applied already over the entire animation. Therefore, if easing per keyframe interval is desired instead, it is necessary to set the overall effect easer to linear easing (spark.effects.easing.Linear) and then set the easer on each Keyframe as appropriate.

Because this property acts on the interval between the previous Keyframe object in a sequence and this Keyframe object, the easer property is ignored on the first Keyframe object in a sequence.

O valor padrão é Linear.

time

propriedade

public var time:Number

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 4

Versões de runtime:

Flash Player 10, AIR 1.5

The time, in milliseconds, at which the effect target for this keyframe should have the value specified by the value property. This time is relative to the starting time of the effect defined with this keyframe.

value

propriedade

public var value:Object

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 4

Versões de runtime:

Flash Player 10, AIR 1.5

The value that the property of the effect target should have at the time specified by the time property.

valueBy

propriedade

public var valueBy:Object

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 4

Versões de runtime:

Flash Player 10, AIR 1.5

Optional parameter which, if specified, is used to calculate value in this keyframe or the previous one. If value is not set in the previous keyframe, but this keyframe defines both value and valueBy, then value in the previous keyframe is calculated as value in this keyframe minus valueBy in this keyframe.

Similarly, if value in this keyframe is not defined, but valueBy in this keyframe and value in the previous keyframe are both set, then value in this keyframe is calculated as value in the previous keyframe plus valueBy in this keyframe.

valueBy is ignored for the first keyframe in a sequence, since it applies only to the interval preceding a keyframe, and there is no preceding interval for the first keyframe.

Detalhes do construtor

()

Construtor

public function Keyframe(time:Number = NaN, value:Object = null, valueBy:Object = null)

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 4

Versões de runtime:

Flash Player 10, AIR 1.5

Constructor.

Parâmetros

	`time:Number` (default = `NaN`) — The time, in milliseconds, at which the effect target of this keyframe should have the value specified by the `value` parameter.

	`value:Object` (default = `null`) — The value that the effect target should have at the given `time`.

	`valueBy:Object` (default = `null`) — Optional parameter which, if provided, causes `value` to be calculated dynamically by adding `valueBy` to the `value` of the previous keyframe in the set of keyframes in a MotionPath object. This value is ignored if this is the first Keyframe in a sequence.

Detalhes do método

clone

()

método

public function clone():Keyframe

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 4

Versões de runtime:

Flash Player 10, AIR 1.5

Returns a copy of this Keyframe object.

Retorna

Keyframe — A copy of this Keyframe object.

Exemplos Como usar este exemplo

KeyFrameEffectExample.mxml

<?xml version="1.0"?>
<!-- Simple example to demonstrate the s:Keyframe and s:MotionPath classes. -->
<s:Application
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark">

    <fx:Declarations>
        <fx:Vector id="kf" type="spark.effects.animation.MotionPath">
            <s:MotionPath property="scaleX">
                <s:Keyframe time="250" value="0.5"/>
                <s:Keyframe time="500" value="1.0"/>
                <s:Keyframe time="750" value="0.5"/>
                <s:Keyframe time="1000" value="1.0"/> 
                <s:Keyframe time="1250" value="0.5"/>
                <s:Keyframe time="1500" value="1.0"/>
            </s:MotionPath> 
            <s:MotionPath property="scaleY">
                <s:Keyframe time="250" value="0.5"/>
                <s:Keyframe time="500" value="1.0"/>
                <s:Keyframe time="750" value="0.5"/>
                <s:Keyframe time="1000" value="1.0"/>
                <s:Keyframe time="1250" value="0.5"/>
                <s:Keyframe time="1500" value="1.0"/>
            </s:MotionPath>
        </fx:Vector>
        
        <s:Animate id="shrinkEffect"
            motionPaths="{kf}"
            target="{myImage}"/>
    </fx:Declarations>

    <s:Panel id="examplePanel"
        title="Keyframe and MotionPath Effect Example"
        width="75%" height="75%">
        <s:layout>
            <s:VerticalLayout paddingTop="10" paddingLeft="10"/>
        </s:layout>

        <!-- Directions -->
        <s:VGroup id="detailsBox" width="50%" left="0">
            <s:Label width="99%" color="blue"
                text="Click the Adobe logo to watch the effect."/>
        </s:VGroup>

        <mx:Image id="myImage" 
            source="@Embed(source='assets/logo.jpg')"
            click="shrinkEffect.end();shrinkEffect.play();"/>
    </s:Panel>
</s:Application>

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Keyframe - AS3 Flex

Classes x

easer

time

value

valueBy

Keyframe

clone