| Paquete | spark.components |
| Clase | public class DropDownList |
| Herencia | DropDownList  DropDownListBase List ListBase SkinnableDataContainer SkinnableContainerBase SkinnableComponent UIComponent FlexSprite Sprite DisplayObjectContainer InteractiveObject DisplayObject EventDispatcher Object |
| Subclases | AXMDropDownList, AXMPopUp, AXMSplitActionButton |
| Versión del lenguaje: | ActionScript 3.0 |
| Versión de producto: | Flex 4 |
| Versiones de motor de ejecución: | Flash Player 10, AIR 1.5 |
 | Because this component does not define a skin for the mobile theme, Adobe recommends that you not use it in a mobile application. Alternatively, you can define your own mobile skin for the component. For more information, see Basics of mobile skinning. |
The DropDownList control contains a drop-down list from which the user can select a single value. Its functionality is very similar to that of the SELECT form element in HTML.
The DropDownList control consists of the anchor button, prompt area, and drop-down-list, Use the anchor button to open and close the drop-down-list. The prompt area displays a prompt String, or the selected item in the drop-down-list.
When the drop-down list is open:
- Clicking the anchor button closes the drop-down list and commits the currently selected data item.
- Clicking outside of the drop-down list closes the drop-down list and commits the currently selected data item.
- Clicking on a data item selects that item and closes the drop-down list.
- If the
requireSelectionproperty isfalse, clicking on a data item while pressing the Control key deselects the item and closes the drop-down list.
Note: The Spark list-based controls (the Spark ListBase class and its subclasses
such as ButtonBar, ComboBox, DropDownList, List, and TabBar) do not support the BasicLayout class
as the value of the layout property.
Do not use BasicLayout with the Spark list-based controls.
To use this component in a list-based component, such as a List or DataGrid, create an item renderer. For information about creating an item renderer, see Custom Spark item renderers.
The DropDownList control has the following default characteristics:
| Characteristic | Description |
|---|---|
| Default size | 112 pixels wide and 21 pixels high |
| Minimum size | 112 pixels wide and 21 pixels high |
| Maximum size | 10000 pixels wide and 10000 pixels high |
| Default skin class | spark.skins.spark.DropDownListSkin |
Mostrar sintaxis MXML
Ocultar sintaxis MXMLThe <s:DropDownList> tag inherits all of the tag
attributes of its superclass and adds the following tag attributes:
<s:DropDownList
Properties
prompt=""
typicalItem="null"
Events
closed="No default"
open="No default"
/>
Propiedad MXML predeterminadadataProvider
Más ejemplos
Elementos de API relacionados
Propiedades públicas
| Propiedad | Definido por | ||
|---|---|---|---|
 | accessibilityDescription : String
A convenience accessor for the description property
in this UIComponent's accessibilityProperties object. | UIComponent | |
| accessibilityEnabled : Boolean
A convenience accessor for the silent property
in this UIComponent's accessibilityProperties object. | UIComponent | |
| accessibilityImplementation : AccessibilityImplementation
La implementación actual de accesibilidad (AccessibilityImplementation) para esta instancia de InteractiveObject. | InteractiveObject | |
| accessibilityName : String
A convenience accessor for the name property
in this UIComponent's accessibilityProperties object. | UIComponent | |
| accessibilityProperties : AccessibilityProperties
Las opciones de accesibilidad actuales para este objeto de visualización. | DisplayObject | |
| accessibilityShortcut : String
A convenience accessor for the shortcut property
in this UIComponent's accessibilityProperties object. | UIComponent | |
| activeEffects : Array [solo lectura]
The list of effects that are currently playing on the component,
as an Array of EffectInstance instances. | UIComponent | |
| alpha : Number
Indica el valor de transparencia alfa del objeto especificado. | DisplayObject | |
| arrowKeysWrapFocus : Boolean
If true, using arrow keys to navigate within
the component wraps when it hits either end. | ListBase | |
| autoLayout : Boolean
If true, measurement and layout are done
when the position or size of a child is changed. | SkinnableDataContainer | |
| automationDelegate : Object
The delegate object that handles the automation-related functionality. | UIComponent | |
| automationEnabled : Boolean [solo lectura]
True if this component is enabled for automation, false
otherwise. | UIComponent | |
| automationName : String
Name that can be used as an identifier for this object. | UIComponent | |
| automationOwner : DisplayObjectContainer [solo lectura]
The owner of this component for automation purposes. | UIComponent | |
| automationParent : DisplayObjectContainer [solo lectura]
The parent of this component for automation purposes. | UIComponent | |
| automationTabularData : Object [solo lectura]
An implementation of the IAutomationTabularData interface, which
can be used to retrieve the data. | UIComponent | |
| automationValue : Array [solo lectura]
This value generally corresponds to the rendered appearance of the
object and should be usable for correlating the identifier with
the object as it appears visually within the application. | UIComponent | |
| automationVisible : Boolean [solo lectura]
True if this component is visible for automation, false
otherwise. | UIComponent | |
| baseline : Object
For components, this layout constraint property is a
facade on top of the similarly-named style. | UIComponent | |
| baselinePosition : Number [override] [solo lectura]
The y-coordinate of the baseline
of the first line of text of the component. | SkinnableComponent | |
| blendMode : String
Un valor de la clase BlendMode que especifica el modo de mezcla que debe utilizarse. | DisplayObject | |
| blendShader : Shader [solo escritura]
Define un sombreado para utilizarlo en la mezcla del primer plano y del fondo. | DisplayObject | |
| bottom : Object
For components, this layout constraint property is a
facade on top of the similarly-named style. | UIComponent | |
| buttonMode : Boolean
Especifica el modo de botón de este elemento sprite. | Sprite | |
| cacheAsBitmap : Boolean
Si se define como true, los motores de ejecución de Flash dejan en caché una representación interna de mapa de bits del objeto de visualización. | DisplayObject | |
| cacheAsBitmapMatrix : Matrix
Si su valor no es null, este objeto Matrix define cómo un objeto de visualización se procesa cuando cacheAsBitmap se define como true. | DisplayObject | |
| cacheHeuristic : Boolean [solo escritura]
Used by Flex to suggest bitmap caching for the object. | UIComponent | |
| cachePolicy : String
Specifies the bitmap caching policy for this object. | UIComponent | |
| caretIndex : Number [solo lectura]
Item that is currently in focus. | ListBase | |
| className : String [solo lectura]
The name of this instance's class, such as "Button". | UIComponent | |
| constructor : Object
Una referencia a la clase de objeto o función constructora para una instancia de objeto determinada. | Object | |
| contentMouseX : Number [solo lectura]
Returns the x position of the mouse, in the content coordinate system. | UIComponent | |
| contentMouseY : Number [solo lectura]
Returns the y position of the mouse, in the content coordinate system. | UIComponent | |
| contextMenu : NativeMenu
Especifica el menú contextual asociado a este objeto. | InteractiveObject | |
| currentState : String
The current view state of the component. | UIComponent | |
| cursorManager : ICursorManager [solo lectura]
Gets the CursorManager that controls the cursor for this component
and its peers. | UIComponent | |
| dataProvider : IList
The data provider for this DataGroup. | SkinnableDataContainer | |
| defaultButton : IFlexDisplayObject
The Button control designated as the default button for the container. | SkinnableContainerBase | |
| depth : Number
Determines the order in which items inside of containers
are rendered. | UIComponent | |
| descriptor : UIComponentDescriptor
Reference to the UIComponentDescriptor, if any, that was used
by the createComponentFromDescriptor() method to create this
UIComponent instance. | UIComponent | |
| designLayer : DesignLayer
Specifies the optional DesignLayer instance associated with this visual
element. | UIComponent | |
| document : Object
A reference to the document object associated with this UIComponent. | UIComponent | |
| doubleClickEnabled : Boolean [override]
Specifies whether the UIComponent object receives doubleClick events. | UIComponent | |
| dropTarget : DisplayObject [solo lectura]
Especifica el objeto de visualización sobre el que se está arrastrando el elemento sprite o sobre el que se ha colocado el elemento sprite. | Sprite | |
| enabled : Boolean
Whether the component can accept user interaction. | UIComponent | |
| errorString : String
The text that displayed by a component's error tip when a
component is monitored by a Validator and validation fails. | UIComponent | |
| explicitHeight : Number
Number that specifies the explicit height of the component,
in pixels, in the component's coordinates. | UIComponent | |
| explicitMaxHeight : Number
The maximum recommended height of the component to be considered
by the parent during layout. | UIComponent | |
| explicitMaxWidth : Number
The maximum recommended width of the component to be considered
by the parent during layout. | UIComponent | |
| explicitMinHeight : Number
The minimum recommended height of the component to be considered
by the parent during layout. | UIComponent | |
| explicitMinWidth : Number
The minimum recommended width of the component to be considered
by the parent during layout. | UIComponent | |
| explicitWidth : Number
Number that specifies the explicit width of the component,
in pixels, in the component's coordinates. | UIComponent | |
| filters : Array
Conjunto indexado que contiene todos los objetos de filtro actualmente asociados con el objeto de visualización. | DisplayObject | |
| flexContextMenu : IFlexContextMenu
The context menu for this UIComponent. | UIComponent | |
| focusEnabled : Boolean
Indicates whether the component can receive focus when tabbed to. | UIComponent | |
| focusManager : IFocusManager
Gets the FocusManager that controls focus for this component
and its peers. | UIComponent | |
| focusPane : Sprite
The focus pane associated with this object. | UIComponent | |
| focusRect : Object
Especifica si este objeto muestra un rectángulo de selección. | InteractiveObject | |
| graphics : Graphics [solo lectura]
Especifica el objeto Graphics que pertenece a este elemento sprite, donde pueden ejecutarse comandos de dibujo vectorial. | Sprite | |
| hasFocusableChildren : Boolean [override]
A flag that indicates whether this List's focusable item renderers
can take keyboard focus. | List | |
| hasLayoutMatrix3D : Boolean [solo lectura]
Contains true if the element has 3D Matrix. | UIComponent | |
| height : Number [override]
Number that specifies the height of the component, in pixels,
in the parent's coordinates. | UIComponent | |
| hitArea : Sprite
Designa otro elemento sprite para que actúe como área activa de un elemento sprite. | Sprite | |
| horizontalCenter : Object
For components, this layout constraint property is a
facade on top of the similarly-named style. | UIComponent | |
| id : String
ID of the component. | UIComponent | |
| includeInLayout : Boolean
Specifies whether this component is included in the layout of the
parent container. | UIComponent | |
| inheritingStyles : Object
The beginning of this component's chain of inheriting styles. | UIComponent | |
| initialized : Boolean
A flag that determines if an object has been through all three phases
of layout: commitment, measurement, and layout (provided that any were required). | UIComponent | |
| instanceIndex : int [solo lectura]
The index of a repeated component. | UIComponent | |
| instanceIndices : Array
An Array containing the indices required to reference
this UIComponent object from its parent document. | UIComponent | |
| is3D : Boolean [solo lectura]
Contains true when the element is in 3D. | UIComponent | |
| isDocument : Boolean [solo lectura]
Contains true if this UIComponent instance is a document object. | UIComponent | |
| isDropDownOpen : Boolean [solo lectura]
Contains true if the drop down is open. | DropDownListBase | |
| isPopUp : Boolean
Set to true by the PopUpManager to indicate
that component has been popped up. | UIComponent | |
| itemRenderer : IFactory
The item renderer to use for data items. | SkinnableDataContainer | |
| itemRendererFunction : Function
Function that returns an item renderer IFactory for a
specific item. | SkinnableDataContainer | |
| labelField : String
The name of the field in the data provider items to display
as the label. | ListBase | |
| labelFunction : Function
A user-supplied function to run on each item to determine its label. | ListBase | |
| layout : LayoutBase
The layout object for this container. | SkinnableDataContainer | |
| layoutMatrix3D : Matrix3D [solo escritura]
The transform matrix that is used to calculate a component's layout
relative to its siblings. | UIComponent | |
| left : Object
For components, this layout constraint property is a
facade on top of the similarly-named style. | UIComponent | |
| loaderInfo : LoaderInfo [solo lectura]
Devuelve un objeto LoaderInfo que contiene información sobre la carga del archivo al que pertenece este objeto de visualización. | DisplayObject | |
| maintainProjectionCenter : Boolean
When true, the component keeps its projection matrix centered on the
middle of its bounding box. | UIComponent | |
| mask : DisplayObject
El objeto de visualización que origina la llamada se enmascara mediante el objeto mask especificado. | DisplayObject | |
| maxHeight : Number
The maximum recommended height of the component to be considered
by the parent during layout. | UIComponent | |
| maxWidth : Number
The maximum recommended width of the component to be considered
by the parent during layout. | UIComponent | |
| measuredHeight : Number
The default height of the component, in pixels. | UIComponent | |
| measuredMinHeight : Number
The default minimum height of the component, in pixels. | UIComponent | |
| measuredMinWidth : Number
The default minimum width of the component, in pixels. | UIComponent | |
| measuredWidth : Number
The default width of the component, in pixels. | UIComponent | |
| metaData : Object
Obtiene el objeto de metadatos de la instancia de DisplayObject si los metadatos se almacenaron con la instancia de este objeto DisplayObject en el archivo SWF a través de una etiqueta PlaceObject4. | DisplayObject | |
| minHeight : Number
The minimum recommended height of the component to be considered
by the parent during layout. | UIComponent | |
| minWidth : Number
The minimum recommended width of the component to be considered
by the parent during layout. | UIComponent | |
| moduleFactory : IFlexModuleFactory
A module factory is used as context for using embedded fonts and for
finding the style manager that controls the styles for this
component. | UIComponent | |
| mouseChildren : Boolean
Determina si los elementos secundarios del objeto están activados para acciones de ratón o de dispositivo de entrada de usuario. | DisplayObjectContainer | |
| mouseEnabled : Boolean
Especifica si este objeto recibe la entrada del ratón, la entrada del usuario o mensajes. | InteractiveObject | |
| mouseFocusEnabled : Boolean
Whether you can receive focus when clicked on. | UIComponent | |
| mouseX : Number [solo lectura]
Indica la coordenada x de la posición del ratón o del dispositivo de entrada del usuario, en píxeles. | DisplayObject | |
| mouseY : Number [solo lectura]
Indica la coordenada y de la posición del ratón o del dispositivo de entrada del usuario, en píxeles. | DisplayObject | |
| name : String
Indica el nombre de instancia de DisplayObject. | DisplayObject | |
| needsSoftKeyboard : Boolean
Especifica si un teclado virtual (teclado en pantalla) se debe mostrar cuando esta instancia de InteractiveObject recibe la selección. | InteractiveObject | |
| nestLevel : int
Depth of this object in the containment hierarchy. | UIComponent | |
| nonInheritingStyles : Object
The beginning of this component's chain of non-inheriting styles. | UIComponent | |
| numAutomationChildren : int [solo lectura]
The number of automation children this container has. | UIComponent | |
| opaqueBackground : Object
Especifica si el objeto de visualización es opaco con un determinado color de fondo. | DisplayObject | |
| owner : DisplayObjectContainer
The owner of this IVisualElement object. | UIComponent | |
| pageScrollingEnabled : Boolean
Whether page scrolling is currently enabled for this Scroller
| List | |
| parent : DisplayObjectContainer [override] [solo lectura]
The parent container or component for this component. | UIComponent | |
| parentApplication : Object [solo lectura]
A reference to the Application object that contains this UIComponent
instance. | UIComponent | |
| parentDocument : Object [solo lectura]
A reference to the parent document object for this UIComponent. | UIComponent | |
| percentHeight : Number
Specifies the height of a component as a percentage
of its parent's size. | UIComponent | |
| percentWidth : Number
Specifies the width of a component as a percentage
of its parent's size. | UIComponent | |
| 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. | UIComponent | |
| processedDescriptors : Boolean
Set to true after immediate or deferred child creation,
depending on which one happens. | UIComponent | |
| prompt : String
The prompt for the DropDownList control. | DropDownList | ||
| repeater : IRepeater [solo lectura]
A reference to the Repeater object
in the parent document that produced this UIComponent. | UIComponent | |
| repeaterIndex : int [solo lectura]
The index of the item in the data provider
of the Repeater that produced this UIComponent. | UIComponent | |
| repeaterIndices : Array
An Array containing the indices of the items in the data provider
of the Repeaters in the parent document that produced this UIComponent. | UIComponent | |
| repeaters : Array
An Array containing references to the Repeater objects
in the parent document that produced this UIComponent. | UIComponent | |
| requireSelection : Boolean
If true, a data item must always be selected in the control. | ListBase | |
| right : Object
For components, this layout constraint property is a
facade on top of the similarly-named style. | UIComponent | |
| root : DisplayObject [solo lectura]
Para un objeto de visualización en un archivo SWF cargado, la propiedad root es el objeto de visualización de nivel más alto en la parte de la estructura de árbol de la lista de visualización representada por dicho archivo SWF. | DisplayObject | |
| rotation : Number [override]
Indica el giro de la instancia de DisplayObject, expresado en grados, con respecto a su orientación original. | UIComponent | |
| rotationX : Number [override]
Indicates the x-axis rotation of the DisplayObject instance, in degrees, from its original orientation
relative to the 3D parent container. | UIComponent | |
| rotationY : Number [override]
Indicates the y-axis rotation of the DisplayObject instance, in degrees, from its original orientation
relative to the 3D parent container. | UIComponent | |
| rotationZ : Number [override]
Indicates the z-axis rotation of the DisplayObject instance, in degrees, from its original orientation relative to the 3D parent container. | UIComponent | |
| scale9Grid : Rectangle
La cuadrícula de escala aplicada actualmente. | DisplayObject | |
| scaleX : Number [override]
Number that specifies the horizontal scaling factor. | UIComponent | |
| scaleY : Number [override]
Number that specifies the vertical scaling factor. | UIComponent | |
| scaleZ : Number [override]
Number that specifies the scaling factor along the z axis. | UIComponent | |
| screen : Rectangle [solo lectura]
Returns an object that contains the size and position of the base
drawing surface for this object. | UIComponent | |
| scrollRect : Rectangle
Los límites del rectángulo de desplazamiento del objeto de visualización. | DisplayObject | |
| scrollSnappingMode : String
The scroll snapping mode currently in effect for this Scroller
Changing this property to anything other than "none" may
result in an immediate change in scroll position to ensure
an element is correctly "snapped" into position. | List | |
| selectedIndex : int
The 0-based index of the selected item, or -1 if no item is selected. | ListBase | |
| selectedItem : *
The item that is currently selected. | ListBase | |
| showInAutomationHierarchy : Boolean
A flag that determines if an automation object
shows in the automation hierarchy. | UIComponent | |
| skin : UIComponent [solo lectura]
The instance of the skin class for this component instance. | SkinnableComponent | |
| softKeyboard : String
Controla la apariencia del teclado virtual. | InteractiveObject | |
| softKeyboardInputAreaOfInterest : Rectangle
Define el área que debe permanecer en pantalla cuando se muestra un teclado virtual (no disponible en iOS). | InteractiveObject | |
| soundTransform : flash.media:SoundTransform
Controla el sonido dentro de este elemento sprite. | Sprite | |
| stage : Stage [solo lectura]
El escenario del objeto de visualización. | DisplayObject | |
| states : Array
The view states that are defined for this component. | UIComponent | |
| styleDeclaration : CSSStyleDeclaration
Storage for the inline inheriting styles on this object. | UIComponent | |
| styleManager : IStyleManager2 [solo lectura]
Returns the StyleManager instance used by this component. | UIComponent | |
| styleName : Object
The class style used by this component. | UIComponent | |
| styleParent : IAdvancedStyleClient
A component's parent is used to evaluate descendant selectors. | UIComponent | |
| suggestedFocusSkinExclusions : Array [solo lectura]
Lists the skin parts that are
excluded from bitmaps captured and used to
show focus. | SkinnableComponent | |
| systemManager : ISystemManager
Returns the SystemManager object used by this component. | UIComponent | |
| tabChildren : Boolean
Determina si los elementos secundarios del objeto están habilitados para tabulación. | DisplayObjectContainer | |
| tabEnabled : Boolean
Especifica si este objeto está en el orden de tabulación. | InteractiveObject | |
| tabFocusEnabled : Boolean
A flag that indicates whether this object can receive focus
via the TAB key
This is similar to the tabEnabled property
used by the Flash Player.
This is usually true for components that
handle keyboard input, but some components in controlbars
have them set to false because they should not steal
focus from another component like an editor. | UIComponent | |
| tabIndex : int
Especifica el orden de tabulación de los objetos de un archivo SWF. | InteractiveObject | |
| textSnapshot : flash.text:TextSnapshot [solo lectura]
Devuelve un objeto TextSnapshot para esta instancia de DisplayObjectContainer. | DisplayObjectContainer | |
| toolTip : String
Text to display in the ToolTip. | UIComponent | |
| top : Object
For components, this layout constraint property is a
facade on top of the similarly-named style. | UIComponent | |
| transform : flash.geom:Transform [override]
An object with properties pertaining to a display object's matrix, color transform,
and pixel bounds. | UIComponent | |
| transformX : Number
Sets the x coordinate for the transform center of the component. | UIComponent | |
| transformY : Number
Sets the y coordinate for the transform center of the component. | UIComponent | |
| transformZ : Number
Sets the z coordinate for the transform center of the component. | UIComponent | |
| transitions : Array
An Array of Transition objects, where each Transition object defines a
set of effects to play when a view state change occurs. | UIComponent | |
| tweeningProperties : Array
Array of properties that are currently being tweened on this object. | UIComponent | |
| typicalItem : Object [override]
Layouts use the preferred size of the typicalItem
when fixed row or column sizes are required, but a specific
rowHeight or columnWidth value is not set. | DropDownList | ||
| uid : String
A unique identifier for the object. | UIComponent | |
| updateCompletePendingFlag : Boolean
A flag that determines if an object has been through all three phases
of layout validation (provided that any were required). | UIComponent | |
| useHandCursor : Boolean
Valor booleano que indica si debe aparecer la mano que señala (cursor de mano) cuando el puntero pasa por encima de un elemento sprite en el que la propiedad buttonMode se ha definido con el valor true. | Sprite | |
| useVirtualLayout : Boolean [override]
Sets the value of the useVirtualLayout property
of the layout associated with this control. | List | |
| validationSubField : String
Used by a validator to associate a subfield with this component. | UIComponent | |
| verticalCenter : Object
For components, this layout constraint property is a
facade on top of the similarly-named style. | UIComponent | |
| visible : Boolean [override]
Whether or not the display object is visible. | UIComponent | |
| width : Number [override]
Number that specifies the width of the component, in pixels,
in the parent's coordinates. | UIComponent | |
| x : Number [override]
Number that specifies the component's horizontal position,
in pixels, within its parent container. | UIComponent | |
| y : Number [override]
Number that specifies the component's vertical position,
in pixels, within its parent container. | UIComponent | |
| z : Number [override]
Indicates the z coordinate position along the z-axis of the DisplayObject
instance relative to the 3D parent container. | UIComponent | |
Propiedades protegidas
Métodos públicos
| Método | Definido por | ||
|---|---|---|---|
Constructor. | DropDownList | ||
|
Adds the selected items to the DragSource object as part of
a drag-and-drop operation. | List | |
| addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registra un objeto de detector de eventos con un objeto EventDispatcher, de modo que el detector reciba la notificación de un evento. | EventDispatcher | |
|
Adds a non-visual style client to this component instance. | UIComponent | |
|
Indica si las restricciones de seguridad provocarían la omisión de objetos de visualización de la lista devuelta al llamar al método DisplayObjectContainer.getObjectsUnderPoint() con el punto point especificado. | DisplayObjectContainer | |
|
Queues a function to be called later. | UIComponent | |
|
Deletes a style property from this component instance. | UIComponent | |
|
Close the drop-down list and dispatch a DropDownEvent.CLOSE event. | DropDownListBase | |
|
Determina si el objeto de visualización especificado es un elemento secundario de la instancia de DisplayObjectContainer o la propia instancia. | DisplayObjectContainer | |
|
Converts a Point object from content coordinates to global coordinates. | UIComponent | |
|
Converts a Point object from content to local coordinates. | UIComponent | |
|
Returns a set of properties that identify the child within
this container. | UIComponent | |
|
Returns a set of properties that identify the child within
this container. | UIComponent | |
|
Creates an instance of a class that is used to display the visuals
of the dragged items during a drag and drop operation. | List | |
|
Creates and instance of the dropIndicator class that is used to
display the visuals of the drop location during a drag and drop
operation. | List | |
|
Creates an id reference to this IUIComponent object
on its parent document object. | UIComponent | |
|
Deletes the id reference to this IUIComponent object
on its parent document object. | UIComponent | |
|
Releases the dropIndicator instance that is currently set in the layout. | List | |
|
Returns a UITextFormat object corresponding to the text styles
for this UIComponent. | UIComponent | |
| [override]
Dispatches an event into the event flow. | UIComponent | |
|
Shows or hides the focus indicator around this component. | UIComponent | |
| drawRoundRect(x:Number, y:Number, w:Number, h:Number, r:Object = null, c:Object = null, alpha:Object = null, rot:Object = null, gradient:String = null, ratios:Array = null, hole:Object = null):void
Programmatically draws a rectangle into this skin's Graphics object. | UIComponent | |
|
Called by the effect instance when it stops playing on the component. | UIComponent | |
|
Called by the effect instance when it starts playing on the component. | UIComponent | |
|
Ends all currently playing effects on the component. | UIComponent | |
|
A convenience method that handles scrolling a data item
into view. | List | |
|
Executes all the bindings for which the UIComponent object is the destination. | UIComponent | |
|
Called after printing is complete. | UIComponent | |
|
Provides the automation object at the specified index. | UIComponent | |
|
Provides the automation object list . | UIComponent | |
|
Devuelve un rectángulo que define el área del objeto de visualización relativo al sistema de coordenadas del objeto targetCoordinateSpace. | DisplayObject | |
|
Returns the x coordinate of the element's bounds at the specified element size. | UIComponent | |
|
Returns the y coordinate of the element's bounds at the specified element size. | UIComponent | |
|
Devuelve el objeto de visualización secundario que sale con el nombre especificado. | DisplayObjectContainer | |
|
Finds the type selectors for this UIComponent instance. | UIComponent | |
|
Returns a layout constraint value, which is the same as
getting the constraint style for this component. | UIComponent | |
|
A convenience method for determining whether to use the
explicit or measured height
| UIComponent | |
|
A convenience method for determining whether to use the
explicit or measured width
| UIComponent | |
|
Gets the object that currently has focus. | UIComponent | |
|
Returns the element's layout height. | UIComponent | |
|
Returns the element's layout width. | UIComponent | |
|
Returns the x coordinate that the element uses to draw on screen. | UIComponent | |
|
Returns the y coordinate that the element uses to draw on screen. | UIComponent | |
|
Returns the transform matrix that is used to calculate the component's
layout relative to its siblings. | UIComponent | |
|
Returns the layout transform Matrix3D for this element. | UIComponent | |
|
Returns the element's maximum height. | UIComponent | |
|
Returns the element's maximum width. | UIComponent | |
|
Returns the element's minimum height. | UIComponent | |
|
Returns the element's minimum width. | UIComponent | |
|
Devuelve un conjunto de objetos que quedan bajo el punto especificado y son elementos secundarios (o terciarios, etc.) de esta instancia de DisplayObjectContainer. | DisplayObjectContainer | |
|
Returns the element's preferred height. | UIComponent | |
|
Returns the element's preferred width. | UIComponent | |
|
Devuelve un rectángulo que define el límite del objeto de visualización, basado en el sistema de coordenadas definido por el parámetro targetCoordinateSpace, excluyendo los trazos en las formas. | DisplayObject | |
|
Returns the item in the dataProvider that was used
by the specified Repeater to produce this Repeater, or
null if this Repeater isn't repeated. | UIComponent | |
|
Gets a style property that has been set anywhere in this
component's style lookup chain. | UIComponent | |
|
Converts a Point object from global to content coordinates. | UIComponent | |
|
Convierte el objeto point de las coordenadas del escenario (globales) en las coordenadas del objeto de visualización (locales). | DisplayObject | |
|
Convierte un punto bidimensional de las coordenadas (globales) del escenario en coordenadas (locales) de un objeto tridimensional. | DisplayObject | |
|
Returns true if currentCSSState is not null. | UIComponent | |
|
Comprueba si el objeto EventDispatcher tiene detectores registrados para un tipo concreto de evento. | EventDispatcher | |
|
Indica si un objeto tiene definida una propiedad especificada. | Object | |
|
Determines whether the specified state has been defined on this
UIComponent. | UIComponent | |
|
Calcula el cuadro delimitador del objeto de visualización para ver si se solapa o corta con el cuadro delimitador del objeto de visualización obj. | DisplayObject | |
|
Evalúa el objeto de visualización para comprobar si se solapa o presenta un punto de intersección con el punto especificado por los parámetros x e y. | DisplayObject | |
|
Returns a box Matrix which can be passed to the
drawRoundRect() method
as the rot parameter when drawing a horizontal gradient. | UIComponent | |
|
Initializes the internal structure of this component. | UIComponent | |
|
Initializes various properties which keep track of repeated instances
of this component. | UIComponent | |
|
Marks a component so that its updateDisplayList()
method gets called during a later screen update. | UIComponent | |
|
Called by a component's items to indicate that their depth
property has changed. | UIComponent | |
|
An element must call this method when its layoutDirection changes or
when its parent's layoutDirection changes. | UIComponent | |
|
Marks a component so that its commitProperties()
method gets called during a later screen update. | UIComponent | |
|
Marks a component so that its measure()
method gets called during a later screen update. | UIComponent | |
|
Marks the component so that the new state of the skin is set
during a later screen update. | SkinnableComponent | |
|
Indica si hay una instancia de la clase Object en la cadena de prototipo del objeto especificado como parámetro. | Object | |
| [override]
Given a data item, return the correct text a renderer
should display while taking the labelField
and labelFunction properties into account. | ListBase | |
|
Convierte un punto tridimensional de las coordenadas (locales) del objeto de visualización tridimensional en un punto bidimensional en las coordenadas (globales) del escenario. | DisplayObject | |
|
Converts a Point object from local to content coordinates. | UIComponent | |
|
Convierte el objeto point de coordenadas del objeto de visualización (locales) en coordenadas del escenario (globales). | DisplayObject | |
|
Returns true if cssState matches currentCSSState. | UIComponent | |
|
Determines whether this instance is the same as, or is a subclass of,
the given type. | UIComponent | |
|
Measures the specified HTML text, which can contain HTML tags such
as <font> and <b>,
assuming that it is displayed
in a single-line UITextField using a UITextFormat
determined by the styles of this UIComponent. | UIComponent | |
|
Measures the specified text, assuming that it is displayed
in a single-line UITextField (or UIFTETextField) using a UITextFormat
determined by the styles of this UIComponent. | UIComponent | |
|
Moves the component to a specified position within its parent. | UIComponent | |
|
Propagates style changes to the children. | UIComponent | |
|
Open the drop-down list and dispatch
a DropdownEvent.OPEN event. | DropDownListBase | |
|
Returns true if the chain of owner properties
points from child to this UIComponent. | UIComponent | |
|
Called by Flex when a UIComponent object is added to or removed from a parent. | UIComponent | |
|
Prepares an IFlexDisplayObject for printing. | UIComponent | |
|
Indica si existe la propiedad especificada y si es enumerable. | Object | |
|
Builds or rebuilds the CSS style cache for this component
and, if the recursive parameter is true,
for all descendants of this component as well. | UIComponent | |
|
For each effect event, registers the EffectManager
as one of the event listeners. | UIComponent | |
|
Elimina todas las instancias child de DisplayObject especificadas de la lista de elementos secundarios de la instancia de DisplayObjectContainer. | DisplayObjectContainer | |
|
Elimina un detector del objeto EventDispatcher. | EventDispatcher | |
|
Removes a non-visual style client from this component instance. | UIComponent | |
|
Replays the specified event. | UIComponent | |
|
Muestra un teclado virtual. | InteractiveObject | |
|
Resolves a child by using the id provided. | UIComponent | |
| [estática]
Resumes the background processing of methods
queued by callLater(), after a call to
suspendBackgroundProcessing(). | UIComponent | |
|
Sizes the object. | UIComponent | |
|
Sets a layout constraint value, which is the same as
setting the constraint style for this component. | UIComponent | |
|
Set the current state. | UIComponent | |
|
Sets the focus to this component. | UIComponent | |
|
Sets the coordinates that the element uses to draw on screen. | UIComponent | |
|
Sets the layout size of the element. | UIComponent | |
|
Sets the transform Matrix that is used to calculate the component's layout
size and position relative to its siblings. | UIComponent | |
|
Sets the transform Matrix3D that is used to calculate the component's layout
size and position relative to its siblings. | UIComponent | |
|
Establece la disponibilidad de una propiedad dinámica para operaciones de bucle. | Object | |
|
Sets a style property on this component instance. | UIComponent | |
|
Called when the visible property changes. | UIComponent | |
|
Permite al usuario arrastrar el elemento sprite especificado. | Sprite | |
|
Permite al usuario arrastrar el elemento sprite especificado en un dispositivo táctil. | Sprite | |
|
Se detiene gradualmente la ejecución de línea de tiempo de todos los objetos MovieClip con raíz en este objeto. | DisplayObjectContainer | |
|
Finaliza el método startDrag(). | Sprite | |
|
Finaliza el método startTouchDrag() para su uso con dispositivos táctiles. | Sprite | |
|
Detects changes to style properties. | UIComponent | |
|
Flex calls the stylesInitialized() method when
the styles for a component are first initialized. | UIComponent | |
| [estática]
Blocks the background processing of methods
queued by callLater(),
until resumeBackgroundProcessing() is called. | UIComponent | |
|
Devuelve la representación de cadena de este objeto, con formato según las convenciones específicas de configuración regional. | Object | |
| [override]
Returns a string indicating the location of this object
within the hierarchy of DisplayObjects in the Application. | FlexSprite | |
| 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. | UIComponent | |
|
A utility method to transform a point specified in the local
coordinates of this object to its location in the object's parent's
coordinates. | UIComponent | |
|
Updates an item renderer for use or reuse. | SkinnableDataContainer | |
|
Validates the position and size of children and draws other
visuals. | UIComponent | |
|
Validate and update the properties and layout of this object
and redraw it, if necessary. | UIComponent | |
|
Used by layout logic to validate the properties of a component
by calling the commitProperties() method. | UIComponent | |
|
Validates the measured size of the component
If the LayoutManager.invalidateSize() method is called with
this ILayoutManagerClient, then the validateSize() method
is called when it's time to do measurements. | UIComponent | |
|
Handles both the valid and invalid events from a
validator assigned to this component. | UIComponent | |
|
Devuelve el valor simple del objeto especificado. | Object | |
|
Returns a box Matrix which can be passed to drawRoundRect()
as the rot parameter when drawing a vertical gradient. | UIComponent | |
|
Comprueba si hay registrado un detector de eventos con este objeto EventDispatcher o con cualquiera de sus ascendientes para el tipo de evento concreto. | EventDispatcher | |
Métodos protegidos
Eventos
Estilos
Los estilos son comunes o están asociados a un tema específico. Si el estilo es común, se puede utilizar con cualquier tema. Si un estilo está asociado a un tema específico, solo se puede utilizar si la aplicación usa dicho tema.
Estilos comunes
Estilos de tema Spark
Estilos de tema Móvil
Partes del aspecto
Este componente utiliza aspectos hechos a partir de partes del aspecto. No configure las partes del aspecto directamente. El aspecto de un componente define las partes del aspecto.
| Parte del aspecto | Descripción | Definido por | ||
|---|---|---|---|---|
| Obligatorio: false Tipo de parte: Estático Versión del lenguaje: ActionScript 3.0 Versión de producto: Flex 4 Versiones de motor de ejecución: Flash10, AIR 1.5 An optional skin part that defines the DataGroup in the skin class where data items get pushed into, rendered, and laid out. | SkinnableDataContainer | ||
| Obligatorio: false Tipo de parte: Estático Versión del lenguaje: ActionScript 3.0 Versión de producto: Flex 4 Versiones de motor de ejecución: Flash10, AIR 1.5 A skin part that defines the drop-down list area. When the DropDownListBase is open, clicking anywhere outside of the dropDown skin part closes the drop-down list. | DropDownListBase | ||
| Obligatorio: false Tipo de parte: Dinámico Versión del lenguaje: ActionScript 3.0 Versión de producto: Flex 4 Versiones de motor de ejecución: Flash10, AIR 1.5 A skin part that defines the appearance of the drop indicator. The drop indicator is resized and positioned by the layout to outline the insert location when dragging over the List. By default, the drop indicator for a Spark control is a solid line that spans the width of the control. Create a custom drop indicator by creating a custom skin class for the drop target. In your skin class, create a skin part named dropIndicator, in the IFactory debe devolver un objeto de tipo DisplayObject. | List | ||
labelDisplay:IDisplayText | Obligatorio: false Tipo de parte: Estático Versión del lenguaje: ActionScript 3.0 Versión de producto: Flex 4 Versiones de motor de ejecución: Flash10, AIR 1.5 An optional skin part that holds the prompt or the text of the selected item. | DropDownList | ||
| Obligatorio: true Tipo de parte: Estático Versión del lenguaje: ActionScript 3.0 Versión de producto: Flex 4 Versiones de motor de ejecución: Flash10, AIR 1.5 A skin part that defines the anchor button. | DropDownListBase | ||
| Obligatorio: false Tipo de parte: Estático Versión del lenguaje: ActionScript 3.0 Versión de producto: Flex 4 Versiones de motor de ejecución: Flash10, AIR 1.5 The optional Scroller used to scroll the List. | List | ||
Estados del aspecto
Para aplicar aspectos al componente, implemente un aspecto que defina los siguientes estados. Aunque se deben implementar todos los estados del aspecto, un estado de aspecto puede estar vacío. Un estado de aspecto vacío no especifica ningún cambio en el estado predeterminado del aspecto.
Efectos
Constantes públicas
Información sobre propiedades
prompt | propiedad |
prompt:String| Versión del lenguaje: | ActionScript 3.0 |
| Versión de producto: | Flex 4 |
| Versiones de motor de ejecución: | Flash Player 10, AIR 1.5 |
The prompt for the DropDownList control.
The prompt is a String that is displayed in the
DropDownList when selectedIndex = -1.
It is usually a String such as "Select one...".
Selecting an item in the drop-down list replaces the
prompt with the text from the selected item.
El valor predeterminado es "".
Implementación
public function get prompt():String public function set prompt(value:String):voidtypicalItem | propiedad |
typicalItem:Object[override] | Versión del lenguaje: | ActionScript 3.0 |
| Versión de producto: | Flex 4 |
| Versiones de motor de ejecución: | Flash Player 10, AIR 1.5 |
Layouts use the preferred size of the typicalItem
when fixed row or column sizes are required, but a specific
rowHeight or columnWidth value is not set.
Similarly virtual layouts use this item to define the size
of layout elements that have not been scrolled into view.
The container uses the typical data item, and the associated item renderer, to determine the default size of the container children. By defining the typical item, the container does not have to size each child as it is drawn on the screen.
Setting this property sets the typicalLayoutElement property
of the layout.
Restriction: if the typicalItem is an IVisualItem, it must not
also be a member of the data provider.
Note: Setting typicalItem overrides any explicit width or height
set on the labelDisplay skin part.
El valor predeterminado es null.
Implementación
override public function get typicalItem():Object override public function set typicalItem(value:Object):voidInformación sobre constructores
DropDownList | () | Información sobre |
public function DropDownList()| Versión del lenguaje: | ActionScript 3.0 |
| Versión de producto: | Flex 4 |
| Versiones de motor de ejecución: | Flash Player 10, AIR 1.5 |
Constructor.
Ejemplos Cómo utilizar este ejemplo
DropDownListExample.mxml
<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate the Spark DropDownList control -->
<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.collections.ArrayCollection;
import spark.events.IndexChangeEvent;
[Bindable]
public var myDP:ArrayCollection = new ArrayCollection(
[ {product:"Flex", price:100},
{product:"Air", price:200},
{product:"Catalyst", price:300},
{product:"FlashBuilder", price:400} ]);
private function updateSelection(e:IndexChangeEvent):void
{
currSel.text = "Current Product = " + myDDL.selectedItem.product;
currPrc.text = "Price = $" + myDDL.selectedItem.price;
}
]]>
</fx:Script>
<s:Panel width="75%" height="75%" title="My DropDownList Example"
horizontalCenter="0" verticalCenter="0">
<s:VGroup left="10" right="10" top="10" bottom="10">
<!-- Text components used to display current selection and price -->
<s:Label id="currSel" text="Current Product = -"/>
<s:Label id="currPrc" text="Price = $ -"/>
<!-- DropDownList will call the updateSelection function when the
selectionChanged event is dispatched -->
<s:DropDownList id="myDDL" prompt="Select One"
width="200" dataProvider="{myDP}"
labelField="product"
change="updateSelection(event);"/>
</s:VGroup>
</s:Panel>
</s:Application>
Tue Jun 12 2018, 02:12 PM Z