| Pacchetto | spark.core |
| Interfaccia | public interface IViewport extends IVisualElement , ILayoutElement , ILayoutDirectionElement , IEventDispatcher |
| Implementatori | GroupBase, RichEditableText |
| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
A viewport on its own is not movable by the application user. However, you can combine a viewport with scroll bars so the user can scroll the viewport to see the entire content of the component. Use the Scroller component to add scrolbars to the component.
Elementi API correlati
Proprietà pubbliche
Nascondi proprietà pubbliche ereditate
Mostra proprietà pubbliche ereditate| Proprietà | Definito da | ||
|---|---|---|---|
 | alpha : Number
Indica il valore della trasparenza alfa dell'oggetto specificato. | IVisualElement | |
| baseline : Object
The vertical distance in pixels from the anchor target to
the control's baseline position. | ILayoutElement | |
| baselinePosition : Number [sola lettura]
The y-coordinate of the baseline
of the first line of text of the component. | ILayoutElement | |
| bottom : Object
The vertical distance in pixels from the bottom edge of the component to the
anchor target's bottom edge. | ILayoutElement | |
| clipAndEnableScrolling : Boolean
If true, specifies to clip the children to the boundaries of the viewport. | IViewport | ||
| contentHeight : Number [sola lettura]
The height of the viewport's content. | IViewport | ||
| contentWidth : Number [sola lettura]
The width of the viewport's contents. | IViewport | ||
| depth : Number
Determines the order in which items inside of containers
are rendered. | IVisualElement | |
| designLayer : DesignLayer
Specifies the optional DesignLayer instance associated with this visual
element. | IVisualElement | |
| hasLayoutMatrix3D : Boolean [sola lettura]
Contains true if the element has 3D Matrix. | ILayoutElement | |
| height : Number
Indica l'altezza dell'oggetto di visualizzazione espressa in pixel. | IVisualElement | |
| horizontalCenter : Object
The horizontal distance in pixels from the center of the component to the
center of the anchor target's content area. | ILayoutElement | |
| horizontalScrollPosition : Number
The x coordinate of the origin of the viewport in the component's coordinate system,
where the default value is (0,0) corresponding to the upper-left corner of the component. | IViewport | ||
| includeInLayout : Boolean
Specifies whether this component is included in the layout of the
parent container. | ILayoutElement | |
| is3D : Boolean [sola lettura]
Contains true when the element is in 3D. | IVisualElement | |
| layoutDirection : String
Specifies the desired layout direction for an element: one of LayoutDirection.LTR
(left to right), LayoutDirection.RTL (right to left), or null (inherit). | ILayoutDirectionElement | |
| left : Object
The horizontal distance in pixels from the left edge of the component to the
anchor target's left edge. | ILayoutElement | |
| owner : DisplayObjectContainer
The owner of this IVisualElement object. | IVisualElement | |
| parent : DisplayObjectContainer [sola lettura]
The parent container or component for this component. | IVisualElement | |
| percentHeight : Number
Specifies the height of a component as a percentage
of its parent's size. | ILayoutElement | |
| percentWidth : Number
Specifies the width of a component as a percentage
of its parent's size. | ILayoutElement | |
| postLayoutTransformOffsets : mx.geom:TransformOffsets
Defines a set of adjustments that can be applied to the object's
transform in a way that is invisible to its parent's layout. | IVisualElement | |
| right : Object
The horizontal distance in pixels from the right edge of the component to the
anchor target's right edge. | ILayoutElement | |
| top : Object
The vertical distance in pixels from the top edge of the component to the
anchor target's top edge. | ILayoutElement | |
| verticalCenter : Object
The vertical distance in pixels from the center of the component to the
center of the anchor target's content area. | ILayoutElement | |
| verticalScrollPosition : Number
The y coordinate of the origin of the viewport in the component's coordinate system,
where the default value is (0,0) corresponding to the upper-left corner of the component. | IViewport | ||
| visible : Boolean
Controls the visibility of this visual element. | IVisualElement | |
| width : Number
Indica la larghezza dell'oggetto di visualizzazione espressa in pixel. | IVisualElement | |
| x : Number
Indica la coordinata x dell'istanza DisplayObject relativa alle coordinate locali del DisplayObjectContainer principale. | IVisualElement | |
| y : Number
Indica la coordinata y dell'istanza DisplayObject relativa alle coordinate locali del DisplayObjectContainer principale. | IVisualElement | |
Metodi pubblici
| Metodo | Definito da | ||
|---|---|---|---|
| addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registra un oggetto listener di eventi con un oggetto EventDispatcher, in modo che il listener riceva la notifica di un evento. | IEventDispatcher | |
|
Invia un evento nel flusso di eventi. | IEventDispatcher | |
|
Returns the x coordinate of the element's bounds at the specified element size. | ILayoutElement | |
|
Returns the y coordinate of the element's bounds at the specified element size. | ILayoutElement | |
Returns the amount to add to the viewport's current
horizontalScrollPosition to scroll by the requested scrolling unit. | IViewport | ||
|
Returns the element's layout height. | ILayoutElement | |
|
Returns the element's layout width. | ILayoutElement | |
|
Returns the x coordinate that the element uses to draw on screen. | ILayoutElement | |
|
Returns the y coordinate that the element uses to draw on screen. | ILayoutElement | |
|
Returns the transform matrix that is used to calculate the component's
layout relative to its siblings. | ILayoutElement | |
|
Returns the layout transform Matrix3D for this element. | ILayoutElement | |
|
Returns the element's maximum height. | ILayoutElement | |
|
Returns the element's maximum width. | ILayoutElement | |
|
Returns the element's minimum height. | ILayoutElement | |
|
Returns the element's minimum width. | ILayoutElement | |
|
Returns the element's preferred height. | ILayoutElement | |
|
Returns the element's preferred width. | ILayoutElement | |
Returns the amount to add to the viewport's current
verticalScrollPosition to scroll by the requested scrolling unit. | IViewport | ||
|
Verifica se per l'oggetto EventDispatcher sono presenti listener registrati per un tipo specifico di evento. | IEventDispatcher | |
|
An element must call this method when its layoutDirection changes or
when its parent's layoutDirection changes. | ILayoutDirectionElement | |
|
Rimuove un listener dall'oggetto EventDispatcher. | IEventDispatcher | |
|
Sets the coordinates that the element uses to draw on screen. | ILayoutElement | |
|
Sets the layout size of the element. | ILayoutElement | |
|
Sets the transform Matrix that is used to calculate the component's layout
size and position relative to its siblings. | ILayoutElement | |
|
Sets the transform Matrix3D that is used to calculate the component's layout
size and position relative to its siblings. | ILayoutElement | |
| transformAround(transformCenter:Vector3D, scale:Vector3D = null, rotation:Vector3D = null, translation:Vector3D = null, postLayoutScale:Vector3D = null, postLayoutRotation:Vector3D = null, postLayoutTranslation:Vector3D = null, invalidateLayout:Boolean = true):void
A utility method to update the rotation, scale, and translation of the
transform while keeping a particular point, specified in the component's
own coordinate space, fixed in the parent's coordinate space. | ILayoutElement | |
|
Verifica se un listener di eventi è registrato con questo oggetto EventDispatcher o qualsiasi suo antenato per il tipo di evento specificato. | IEventDispatcher | |
Descrizione delle proprietà
clipAndEnableScrolling | proprietà |
clipAndEnableScrolling:Boolean| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
If true, specifies to clip the children to the boundaries of the viewport.
If false, the container children extend past the container boundaries,
regardless of the size specification of the component.
Il valore predefinito è false.
Implementazione
public function get clipAndEnableScrolling():Boolean public function set clipAndEnableScrolling(value:Boolean):voidElementi API correlati
contentHeight | proprietà |
contentHeight:Number [sola lettura] | Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
The height of the viewport's content.
If clipAndEnabledScrolling is true, the viewport's
contentHeight defines the limit for vertical scrolling
and the viewport's actual height defines how much of the content is visible.
To scroll through the content vertically, vary the
verticalScrollPosition between 0 and
contentHeight - height.
Implementations of this property must be Bindable and
must generate events of type propertyChange.
Implementazione
public function get contentHeight():NumbercontentWidth | proprietà |
contentWidth:Number [sola lettura] | Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
The width of the viewport's contents.
If clipAndEnabledScrolling is true, the viewport's
contentWidth defines the limit for horizontal scrolling
and the viewport's actual width defines how much of the content is visible.
To scroll through the content horizontally, vary the
horizontalScrollPosition between 0 and
contentWidth - width.
Implementations of this property must be Bindable and
must generate events of type propertyChange.
Implementazione
public function get contentWidth():NumberhorizontalScrollPosition | proprietà |
horizontalScrollPosition:Number| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
The x coordinate of the origin of the viewport in the component's coordinate system,
where the default value is (0,0) corresponding to the upper-left corner of the component.
If clipAndEnableScrolling is true, setting this property
typically causes the viewport to be set to:
new Rectangle(horizontalScrollPosition, verticalScrollPosition, width, height)
Implementations of this property must be Bindable and
must generate events of type propertyChange.
Il valore predefinito è 0.
Implementazione
public function get horizontalScrollPosition():Number public function set horizontalScrollPosition(value:Number):voidElementi API correlati
verticalScrollPosition | proprietà |
verticalScrollPosition:Number| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
The y coordinate of the origin of the viewport in the component's coordinate system,
where the default value is (0,0) corresponding to the upper-left corner of the component.
If clipAndEnableScrolling is true, setting this property
typically causes the viewport to be set to:
new Rectangle(horizontalScrollPosition, verticalScrollPosition, width, height)
Implementations of this property must be Bindable and
must generate events of type propertyChange.
Il valore predefinito è 0.
Implementazione
public function get verticalScrollPosition():Number public function set verticalScrollPosition(value:Number):voidElementi API correlati
Descrizione dei metodi
getHorizontalScrollPositionDelta | () | metodo |
public function getHorizontalScrollPositionDelta(navigationUnit:uint):Number| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
Returns the amount to add to the viewport's current
horizontalScrollPosition to scroll by the requested scrolling unit.
Parametri
navigationUnit:uint — The amount to scroll.
The value must be one of the following spark.core.NavigationUnit
constants:
LEFT or RIGHT.
To scroll to the first or last column, use HOME or END.
|
Number — The number of pixels to add to horizontalScrollPosition.
|
Elementi API correlati
getVerticalScrollPositionDelta | () | metodo |
public function getVerticalScrollPositionDelta(navigationUnit:uint):Number| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
Returns the amount to add to the viewport's current
verticalScrollPosition to scroll by the requested scrolling unit.
Parametri
navigationUnit:uint — The amount to scroll.
The value of unit must be one of the following spark.core.NavigationUnit
constants:
UP or DOWN.
To scroll to the first or last row, use HOME or END.
|
Number — The number of pixels to add to verticalScrollPosition.
|
Elementi API correlati
IViewportExample.mxml
<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate Spark IViewport interface -->
<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" >
<s:layout>
<s:HorizontalLayout/>
</s:layout>
<s:Panel title="IViewport Component Example"
width="75%" height="75%"
horizontalCenter="0" verticalCenter="0">
<s:Label text="The Group container implements IViewport. Therefore, you can clip its contents and use it with scrollbars."
color="blue"
top="10"/>
<s:Group id="myGroup" width="100" height="100"
clipAndEnableScrolling="true"
horizontalScrollPosition="50" verticalScrollPosition="50"
left="100" top="40">
<mx:Image width="300" height="400"
source="@Embed(source='/assets/logo.jpg')"/>
</s:Group>
<s:VScrollBar viewport="{myGroup}" height="100" left="210" top="40"/>
<s:HScrollBar viewport="{myGroup}" width="100" left="100" top="150"/>
</s:Panel>
</s:Application>
Tue Jun 12 2018, 02:44 PM Z