| Pacchetto | spark.components |
| Classe | public class DropDownList |
| Ereditarietà | DropDownList  DropDownListBase List ListBase SkinnableDataContainer SkinnableContainerBase SkinnableComponent UIComponent FlexSprite Sprite DisplayObjectContainer InteractiveObject DisplayObject EventDispatcher Object |
| Sottoclassi | AXMDropDownList, AXMPopUp, AXMSplitActionButton |
| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | 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 |
Mostra sintassi MXML
Nascondi sintassi 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"
/>
Proprietà MXML predefinitadataProvider
Altri esempi
Elementi API correlati
Proprietà pubbliche
| Proprietà | Definito da | ||
|---|---|---|---|
 | 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
L'implementazione di accessibilità corrente (AccessibilityImplementation) di questa istanza InteractiveObject. | InteractiveObject | |
| accessibilityName : String
A convenience accessor for the name property
in this UIComponent's accessibilityProperties object. | UIComponent | |
| accessibilityProperties : AccessibilityProperties
Le opzioni di accessibilità correnti di questo oggetto di visualizzazione. | DisplayObject | |
| accessibilityShortcut : String
A convenience accessor for the shortcut property
in this UIComponent's accessibilityProperties object. | UIComponent | |
| activeEffects : Array [sola lettura]
The list of effects that are currently playing on the component,
as an Array of EffectInstance instances. | UIComponent | |
| alpha : Number
Indica il valore della trasparenza alfa dell'oggetto specificato. | 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 [sola lettura]
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 [sola lettura]
The owner of this component for automation purposes. | UIComponent | |
| automationParent : DisplayObjectContainer [sola lettura]
The parent of this component for automation purposes. | UIComponent | |
| automationTabularData : Object [sola lettura]
An implementation of the IAutomationTabularData interface, which
can be used to retrieve the data. | UIComponent | |
| automationValue : Array [sola lettura]
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 [sola lettura]
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] [sola lettura]
The y-coordinate of the baseline
of the first line of text of the component. | SkinnableComponent | |
| blendMode : String
Un valore della classe BlendMode che specifica il metodo di fusione da utilizzare. | DisplayObject | |
| blendShader : Shader [sola scrittura]
Imposta uno shader utilizzato per la fusione dei colori di primo piano e sfondo. | DisplayObject | |
| bottom : Object
For components, this layout constraint property is a
facade on top of the similarly-named style. | UIComponent | |
| buttonMode : Boolean
Specifica la modalità pulsante di questo sprite. | Sprite | |
| cacheAsBitmap : Boolean
Se è impostata su true, nella cache dei runtime Flash viene memorizzata una rappresentazione bitmap interna dell'oggetto di visualizzazione. | DisplayObject | |
| cacheAsBitmapMatrix : Matrix
Se il valore è diverso da null, questo oggetto Matrix definisce il modo in cui viene eseguito il rendering di un oggetto di visualizzazione quando cacheAsBitmap è impostato su true. | DisplayObject | |
| cacheHeuristic : Boolean [sola scrittura]
Used by Flex to suggest bitmap caching for the object. | UIComponent | |
| cachePolicy : String
Specifies the bitmap caching policy for this object. | UIComponent | |
| caretIndex : Number [sola lettura]
Item that is currently in focus. | ListBase | |
| className : String [sola lettura]
The name of this instance's class, such as "Button". | UIComponent | |
| constructor : Object
Un riferimento all'oggetto classe o alla funzione di costruzione per una determinata istanza di oggetto. | Object | |
| contentMouseX : Number [sola lettura]
Returns the x position of the mouse, in the content coordinate system. | UIComponent | |
| contentMouseY : Number [sola lettura]
Returns the y position of the mouse, in the content coordinate system. | UIComponent | |
| contextMenu : NativeMenu
Specifica il menu di scelta rapida associato all'oggetto. | InteractiveObject | |
| currentState : String
The current view state of the component. | UIComponent | |
| cursorManager : ICursorManager [sola lettura]
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 [sola lettura]
Specifica l'oggetto di visualizzazione sopra il quale viene trascinato lo sprite o sul quale viene rilasciato. | 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
Un array indicizzato che contiene ogni oggetto filtro attualmente associato all'oggetto di visualizzazione. | 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
Specifica se l'oggetto visualizza un rettangolo di attivazione. | InteractiveObject | |
| graphics : Graphics [sola lettura]
Specifica l'oggetto Graphics che appartiene a questo oggetto Sprite, in cui possono essere eseguiti i comandi di disegno vettoriale. | Sprite | |
| hasFocusableChildren : Boolean [override]
A flag that indicates whether this List's focusable item renderers
can take keyboard focus. | List | |
| hasLayoutMatrix3D : Boolean [sola lettura]
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
Definisce un altro sprite come area attiva di uno 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 [sola lettura]
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 [sola lettura]
Contains true when the element is in 3D. | UIComponent | |
| isDocument : Boolean [sola lettura]
Contains true if this UIComponent instance is a document object. | UIComponent | |
| isDropDownOpen : Boolean [sola lettura]
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 [sola scrittura]
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 [sola lettura]
Restituisce un oggetto LoaderInfo contenente informazioni sul caricamento del file al quale questo oggetto di visualizzazione appartiene. | DisplayObject | |
| maintainProjectionCenter : Boolean
When true, the component keeps its projection matrix centered on the
middle of its bounding box. | UIComponent | |
| mask : DisplayObject
L'oggetto di visualizzazione chiamante viene mascherato dall'oggetto mask specificato. | 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
Ottiene l’oggetto di metadati dell’istanza DisplayObject se i metadati sono stati memorizzati insieme all’istanza di questo DisplayObject nel file SWF mediante un tag 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 se gli elementi secondari dell'oggetto sono abilitati o meno per il mouse o per il dispositivo di input dell'utente. | DisplayObjectContainer | |
| mouseEnabled : Boolean
Specifica se questo oggetto riceve messaggi del mouse o di altri dispositivi di input dell'utente. | InteractiveObject | |
| mouseFocusEnabled : Boolean
Whether you can receive focus when clicked on. | UIComponent | |
| mouseX : Number [sola lettura]
Indica la coordinata x del mouse o la posizione del dispositivo di input dell'utente, espressa in pixel. | DisplayObject | |
| mouseY : Number [sola lettura]
Indica la coordinata y del mouse o la posizione del dispositivo di input dell'utente, espressa in pixel. | DisplayObject | |
| name : String
Indica il nome dell'istanza dell'oggetto DisplayObject. | DisplayObject | |
| needsSoftKeyboard : Boolean
Specifica se deve essere visualizzata una tastiera virtuale (una tastiera software a video) quando questa istanza InteractiveObject riceve lo stato di attivazione. | 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 [sola lettura]
The number of automation children this container has. | UIComponent | |
| opaqueBackground : Object
Specifica se l'oggetto di visualizzazione è opaco con un determinato colore di sfondo. | 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] [sola lettura]
The parent container or component for this component. | UIComponent | |
| parentApplication : Object [sola lettura]
A reference to the Application object that contains this UIComponent
instance. | UIComponent | |
| parentDocument : Object [sola lettura]
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 [sola lettura]
A reference to the Repeater object
in the parent document that produced this UIComponent. | UIComponent | |
| repeaterIndex : int [sola lettura]
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 [sola lettura]
Nel caso di un oggetto di visualizzazione all'interno di un file SWF caricato, la proprietà principale è l'oggetto di visualizzazione più in alto nella porzione della struttura dell'elenco di visualizzazione rappresentata da quel file SWF. | DisplayObject | |
| rotation : Number [override]
Indica la rotazione dell'istanza DisplayObject, espressa in gradi, rispetto alla posizione originale. | 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 griglia di modifica in scala attualmente attiva. | 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 [sola lettura]
Returns an object that contains the size and position of the base
drawing surface for this object. | UIComponent | |
| scrollRect : Rectangle
I limiti del rettangolo di scorrimento dell'oggetto di visualizzazione. | 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 [sola lettura]
The instance of the skin class for this component instance. | SkinnableComponent | |
| softKeyboard : String
Controlla l'aspetto della tastiera software. | InteractiveObject | |
| softKeyboardInputAreaOfInterest : Rectangle
Definisce l’area che deve rimanere visibile sullo schermo quando è visualizzata una tastiera virtuale (non disponibile in iOS). | InteractiveObject | |
| soundTransform : flash.media:SoundTransform
Controlla il suono nello sprite. | Sprite | |
| stage : Stage [sola lettura]
Lo stage dell'oggetto di visualizzazione. | 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 [sola lettura]
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 [sola lettura]
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 se gli elementi secondari dell'oggetto sono abilitati per la tabulazione. | DisplayObjectContainer | |
| tabEnabled : Boolean
Specifica se questo oggetto è incluso nell'ordine di tabulazione. | 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
Specifica l'ordine di tabulazione degli oggetti in un file SWF. | InteractiveObject | |
| textSnapshot : flash.text:TextSnapshot [sola lettura]
Restituisce un oggetto TextSnapshot per questa istanza 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
Un valore booleano che indica se viene visualizzato un cursore a forma di mano quando il puntatore passa sopra uno sprite in cui la proprietà buttonMode è impostata su 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 | |
Proprietà protette
Metodi pubblici
| Metodo | Definito da | ||
|---|---|---|---|
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 oggetto listener di eventi con un oggetto EventDispatcher, in modo che il listener riceva la notifica di un evento. | EventDispatcher | |
|
Adds a non-visual style client to this component instance. | UIComponent | |
|
Indica se le restrizioni di sicurezza possono determinare l'omissione di eventuali oggetti di visualizzazione dall'elenco restituito dalla chiamata al metodo DisplayObjectContainer.getObjectsUnderPoint() con il punto specificato. | 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 se l'oggetto di visualizzazione specificato è un elemento secondario dell'istanza DisplayObjectContainer oppure è l'istanza stessa. | 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 | |
|
Restituisce un rettangolo che definisce l'area dell'oggetto di visualizzazione relativa al sistema di coordinate dell'oggetto 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 | |
|
Restituisce l'oggetto di visualizzazione secondario al quale corrisponde il nome specificato. | 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 | |
|
Restituisce un array di oggetti che si trovano sotto il punto specificato e sono elementi secondari (di uno o più livelli inferiori) di questa istanza DisplayObjectContainer. | DisplayObjectContainer | |
|
Returns the element's preferred height. | UIComponent | |
|
Returns the element's preferred width. | UIComponent | |
|
Restituisce un rettangolo che definisce i bordi dell'oggetto di visualizzazione in base al sistema di coordinate definito dal parametro targetCoordinateSpace, esclusi gli eventuali tratti presenti sulle forme. | 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 | |
|
Converte le coordinate dello stage (globali) in quelle (locali) dell'oggetto di visualizzazione per l'oggetto Point. | DisplayObject | |
|
Converte un punto bidimensionale dalle coordinate dello stage (globali) in quelle (locali) di un oggetto di visualizzazione tridimensionale. | DisplayObject | |
|
Returns true if currentCSSState is not null. | UIComponent | |
|
Verifica se per l'oggetto EventDispatcher sono presenti listener registrati per un tipo specifico di evento. | EventDispatcher | |
|
Indica se per un oggetto è definita una proprietà specifica. | Object | |
|
Determines whether the specified state has been defined on this
UIComponent. | UIComponent | |
|
Valuta il riquadro di delimitazione dell'oggetto di visualizzazione per verificare se si sovrappone o si interseca con il riquadro di delimitazione dell'oggetto di visualizzazione obj. | DisplayObject | |
|
Valuta l'oggetto di visualizzazione per stabilire se si sovrappone o si interseca con il punto specificato dai parametri 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 se un'istanza della classe Object si trova nella catena di prototipi dell'oggetto specificato come parametro. | Object | |
| [override]
Given a data item, return the correct text a renderer
should display while taking the labelField
and labelFunction properties into account. | ListBase | |
|
Converte un punto tridimensionale delle coordinate (locali) dell'oggetto di visualizzazione tridimensionale in un punto bidimensionale nelle coordinate dello stage (globali). | DisplayObject | |
|
Converts a Point object from local to content coordinates. | UIComponent | |
|
Converte le coordinate dell'oggetto di visualizzazione (locali) in quelle dello stage (globali) per l'oggetto Point. | 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 se la proprietà specificata esiste ed è enumerabile. | 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 | |
|
Rimuove tutte le istanze DisplayObject secondarie dall'elenco degli elementi secondari dell'istanza DisplayObjectContainer. | DisplayObjectContainer | |
|
Rimuove un listener dall'oggetto EventDispatcher. | EventDispatcher | |
|
Removes a non-visual style client from this component instance. | UIComponent | |
|
Replays the specified event. | UIComponent | |
|
Alza una tastiera virtuale. | InteractiveObject | |
|
Resolves a child by using the id provided. | UIComponent | |
| [statico]
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 | |
|
Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche. | Object | |
|
Sets a style property on this component instance. | UIComponent | |
|
Called when the visible property changes. | UIComponent | |
|
Consente all'utente di trascinare lo sprite specificato. | Sprite | |
|
Consente all'utente di trascinare lo sprite specificato su un dispositivo abilitato per il tocco. | Sprite | |
|
Interrompe in modo ricorsivo l’esecuzione della linea temporale di qualsiasi MovieClips che ha origine in questo oggetto. | DisplayObjectContainer | |
|
Termina il metodo startDrag(). | Sprite | |
|
Termina il metodo startTouchDrag(), utilizzato con i dispositivi abilitati per il tocco. | Sprite | |
|
Detects changes to style properties. | UIComponent | |
|
Flex calls the stylesInitialized() method when
the styles for a component are first initialized. | UIComponent | |
| [statico]
Blocks the background processing of methods
queued by callLater(),
until resumeBackgroundProcessing() is called. | UIComponent | |
|
Restituisce la rappresentazione in formato stringa di questo oggetto, formattato in base alle convenzioni specifiche per le versioni localizzate. | 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 | |
|
Restituisce il valore di base dell'oggetto specificato. | Object | |
|
Returns a box Matrix which can be passed to drawRoundRect()
as the rot parameter when drawing a vertical gradient. | UIComponent | |
|
Verifica se un listener di eventi è registrato con questo oggetto EventDispatcher o qualsiasi suo antenato per il tipo di evento specificato. | EventDispatcher | |
Metodi protetti
Eventi
Stili
Gli stili sono di tipo comune oppure associati a un tema specifico. Se lo stile è comune, può essere utilizzato con qualunque tema. Se è associato a un tema specifico, può essere utilizzato solo se la vostra applicazione ne fa uso.
Stili comuni
Stili tema Spark
Stili tema Mobile
Parti skin
Questo componente utilizza skin costituiti da più parti. Non impostate le parti degli skin direttamente. Vengono impostate dallo skin del componente.
| Parte skin | Descrizione | Definito da | ||
|---|---|---|---|---|
| Obbligatorio: false Tipo parte: Statico Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 4 Versioni runtime: 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 | ||
| Obbligatorio: false Tipo parte: Statico Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 4 Versioni runtime: 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 | ||
| Obbligatorio: false Tipo parte: Dinamico Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 4 Versioni runtime: 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 deve restituire un oggetto del tipo DisplayObject. | List | ||
labelDisplay:IDisplayText | Obbligatorio: false Tipo parte: Statico Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 4 Versioni runtime: Flash10, AIR 1.5 An optional skin part that holds the prompt or the text of the selected item. | DropDownList | ||
| Obbligatorio: true Tipo parte: Statico Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 4 Versioni runtime: Flash10, AIR 1.5 A skin part that defines the anchor button. | DropDownListBase | ||
| Obbligatorio: false Tipo parte: Statico Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 4 Versioni runtime: Flash10, AIR 1.5 The optional Scroller used to scroll the List. | List | ||
Stati skin
Per applicare uno skin al componente, implementate uno skin che definisce gli stati seguenti. Benché sia necessario implementare tutti gli stati dello skin, potete lasciare vuoto uno stato di skin. Uno stato di skin vuoto non applica alcuna modifica allo stato predefinito dello skin.
Effetti
Costanti pubbliche
Descrizione delle proprietà
prompt | proprietà |
prompt:String| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | 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.
Il valore predefinito è "".
Implementazione
public function get prompt():String public function set prompt(value:String):voidtypicalItem | proprietà |
typicalItem:Object[override] | Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | 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.
Il valore predefinito è null.
Implementazione
override public function get typicalItem():Object override public function set typicalItem(value:Object):voidDescrizione della funzione di costruzione
DropDownList | () | Funzione di costruzione |
public function DropDownList()| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 4 |
| Versioni runtime: | Flash Player 10, AIR 1.5 |
Constructor.
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, 02:44 PM Z