FocusManager

Pacchetto	mx.managers
Classe	public class FocusManager
Ereditarietà	FocusManager EventDispatcher Object
Implementa	IFocusManager

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The FocusManager class manages the focus on components in response to mouse activity or keyboard activity (Tab key). There can be several FocusManager instances in an application. Each FocusManager instance is responsible for a set of components that comprise a "tab loop". If you hit Tab enough times, focus traverses through a set of components and eventually get back to the first component that had focus. That is a "tab loop" and a FocusManager instance manages that loop. If there are popup windows with their own set of components in a "tab loop" those popup windows will have their own FocusManager instances. The main application always has a FocusManager instance.

The FocusManager manages focus from the "component level". In Flex, a UITextField in a component is the only way to allow keyboard entry of text. To the Flash Player or AIR, that UITextField has focus. However, from the FocusManager's perspective the component that parents the UITextField has focus. Thus there is a distinction between component-level focus and player-level focus. Application developers generally only have to deal with component-level focus while component developers must understand player-level focus.

All components that can be managed by the FocusManager must implement mx.managers.IFocusManagerComponent, whereas objects managed by player-level focus do not.

The FocusManager also managers the concept of a defaultButton, which is the Button on a form that dispatches a click event when the Enter key is pressed depending on where focus is at that time.

Altri esempi

Focus in sandboxed applications
Focus in multi-versioned applications

Proprietà pubbliche

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	Proprietà		Definito da
		constructor : Object Un riferimento all'oggetto classe o alla funzione di costruzione per una determinata istanza di oggetto.	Object
		defaultButton : IButton A reference to the original default Button control.	FocusManager
		defaultButtonEnabled : Boolean A flag that indicates whether the FocusManager should check for the Enter key being pressed to activate the default button.	FocusManager
		focusPane : Sprite A single Sprite that is moved from container to container as the focus moves to those containers.	FocusManager
		nextTabIndex : int [sola lettura] The next unique tab index to use in this tab loop.	FocusManager
		showFocusIndicator : Boolean A flag that indicates whether to display an indicator that a component has focus.	FocusManager

Metodi pubblici

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	Metodo		Definito da
		FocusManager(container:IFocusManagerContainer, popup:Boolean = false) Constructor.	FocusManager
		activate():void The SystemManager activates and deactivates a FocusManager if more than one IFocusManagerContainer is visible at the same time.	FocusManager
		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
		deactivate():void The SystemManager activates and deactivates a FocusManager if more than one IFocusManagerContainer is visible at the same time.	FocusManager
		dispatchEvent(event:Event):Boolean Invia un evento nel flusso di eventi.	EventDispatcher
		findFocusManagerComponent(o:InteractiveObject):IFocusManagerComponent Returns the IFocusManagerComponent that contains the given object, if any.	FocusManager
		getFocus():IFocusManagerComponent Gets the IFocusManagerComponent component that currently has the focus.	FocusManager
		getNextFocusManagerComponent(backward:Boolean = false):IFocusManagerComponent Returns the IFocusManagerComponent that would receive focus if the user pressed the Tab key to navigate to another component.	FocusManager
		hasEventListener(type:String):Boolean Verifica se per l'oggetto EventDispatcher sono presenti listener registrati per un tipo specifico di evento.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indica se per un oggetto è definita una proprietà specifica.	Object
		hideFocus():void Sets showFocusIndicator to false and removes the visual focus indicator from the focused object, if any.	FocusManager
		isPrototypeOf(theClass:Object):Boolean Indica se un'istanza della classe Object si trova nella catena di prototipi dell'oggetto specificato come parametro.	Object
		propertyIsEnumerable(name:String):Boolean Indica se la proprietà specificata esiste ed è enumerabile.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Rimuove un listener dall'oggetto EventDispatcher.	EventDispatcher
		setFocus(o:IFocusManagerComponent):void Sets focus to an IFocusManagerComponent component.	FocusManager
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche.	Object
		showFocus():void Sets showFocusIndicator to true and draws the visual focus indicator on the focused object, if any.	FocusManager
		toLocaleString():String Restituisce la rappresentazione in formato stringa di questo oggetto, formattato in base alle convenzioni specifiche per le versioni localizzate.	Object
		toString():String [override] Returns a String representation of the component hosting the FocusManager object, with the String ".focusManager" appended to the end of the String.	FocusManager
		valueOf():Object Restituisce il valore di base dell'oggetto specificato.	Object
		willTrigger(type:String):Boolean Verifica se un listener di eventi è registrato con questo oggetto EventDispatcher o qualsiasi suo antenato per il tipo di evento specificato.	EventDispatcher

Eventi

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	Evento		Riepilogo	Definito da
		activate	[evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR ottiene lo stato di attivazione del sistema operativo ed entra nello stato attivo.	EventDispatcher
		deactivate	[evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR perde l'attivazione del sistema operativo e sta entrando nello stato inattivo.	EventDispatcher

Descrizione delle proprietà

defaultButton

proprietà

defaultButton:IButton

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

A reference to the original default Button control. Pressing the Enter key while the focus is on any control activates the Button control by dispatching a click event on the Button control, just as if it was clicked with the mouse. The actual default Button control changes if focus is given to another Button control, but switches back to the original if focus is not on a button.

This property is managed by Flex containers; do not set it directly to specify the default button.

The defaultButton must be of class mx.controls.Button even though this property is of type IUIComponent.

Implementazione
public function get defaultButton():IButton
public function set defaultButton(value:IButton):void

defaultButtonEnabled

proprietà

defaultButtonEnabled:Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

A flag that indicates whether the FocusManager should check for the Enter key being pressed to activate the default button. TextArea and other components that want to recognize the Enter key set this property to false to disable the Enter key from dispatching a click event on the default button, if it exists.

Implementazione
public function get defaultButtonEnabled():Boolean
public function set defaultButtonEnabled(value:Boolean):void

focusPane

proprietà

focusPane:Sprite

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

A single Sprite that is moved from container to container as the focus moves to those containers. The Sprite is used as the parent of the visual indicator that a component has focus.

Implementazione
public function get focusPane():Sprite
public function set focusPane(value:Sprite):void

nextTabIndex

proprietà

nextTabIndex:int [sola lettura]

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The next unique tab index to use in this tab loop.

Implementazione
public function get nextTabIndex():int

showFocusIndicator

proprietà

showFocusIndicator:Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

A flag that indicates whether to display an indicator that a component has focus. If true a component receiving focus draws a visible indicator that it has focus.

By default, this is false until the user uses the Tab key, then it is set to true.

In general it is better to use the showFocus() and hideFocus() methods to change this property as those methods also update the visual indicator that a component has focus.

Implementazione
public function get showFocusIndicator():Boolean
public function set showFocusIndicator(value:Boolean):void

Descrizione della funzione di costruzione

()

Funzione di costruzione

public function FocusManager(container:IFocusManagerContainer, popup:Boolean = false)

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Constructor.

A FocusManager manages the focus within the children of an IFocusManagerContainer. It installs itself in the IFocusManagerContainer during execution of the constructor.

Parametri

	`container:IFocusManagerContainer` — An IFocusManagerContainer that hosts the FocusManager.

	`popup:Boolean` (default = `false`) — If `true`, indicates that the container is a popup component and not the main application.

Descrizione dei metodi

activate

()

metodo

public function activate():void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The SystemManager activates and deactivates a FocusManager if more than one IFocusManagerContainer is visible at the same time. If the mouse is clicked in an IFocusManagerContainer with a deactivated FocusManager, the SystemManager will call the activate() method on that FocusManager. The FocusManager that was activated will have its deactivate() method called prior to the activation of another FocusManager.

The FocusManager adds event handlers that allow it to monitor focus related keyboard and mouse activity.

deactivate

()

metodo

public function deactivate():void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The FocusManager removes event handlers that allow it to monitor focus related keyboard and mouse activity.

findFocusManagerComponent

()

metodo

public function findFocusManagerComponent(o:InteractiveObject):IFocusManagerComponent

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns the IFocusManagerComponent that contains the given object, if any. Because the player can set focus to a subcomponent of a Flex component this method determines which IFocusManagerComponent has focus from the component perspective.

Parametri

o:InteractiveObject — An object that can have player-level focus.

Restituisce

IFocusManagerComponent — The IFOcusManagerComponent containing o or null

getFocus

()

metodo

public function getFocus():IFocusManagerComponent

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Gets the IFocusManagerComponent component that currently has the focus. Calling this method is recommended instead of using the Stage object because it indicates which component has focus. The Stage might return a subcomponent in that component.

Restituisce

IFocusManagerComponent — IFocusManagerComponent object that has focus.

getNextFocusManagerComponent

()

metodo

public function getNextFocusManagerComponent(backward:Boolean = false):IFocusManagerComponent

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns the IFocusManagerComponent that would receive focus if the user pressed the Tab key to navigate to another component. It will return the same component as the current focused component if there are no other valid components in the application.

Parametri

backward:Boolean (default = false) — If true, return the object as if the Shift-Tab keys were pressed.

Restituisce

IFocusManagerComponent — The component that would receive focus.

hideFocus

()

metodo

public function hideFocus():void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Sets showFocusIndicator to false and removes the visual focus indicator from the focused object, if any.

setFocus

()

metodo

public function setFocus(o:IFocusManagerComponent):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Sets focus to an IFocusManagerComponent component. Does not check for the components visibility, enabled state, or any other conditions.

Parametri

o:IFocusManagerComponent — A component that can receive focus.

showFocus

()

metodo

public function showFocus():void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Sets showFocusIndicator to true and draws the visual focus indicator on the focused object, if any.

toString

()

metodo

override public function toString():String

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns a String representation of the component hosting the FocusManager object, with the String ".focusManager" appended to the end of the String.

Restituisce

String — Returns a String representation of the component hosting the FocusManager object, with the String ".focusManager" appended to the end of the String.

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FocusManager - AS3 Flex

Classi x

defaultButton

defaultButtonEnabled

focusPane

nextTabIndex

showFocusIndicator

FocusManager

activate

deactivate

findFocusManagerComponent

getFocus

getNextFocusManagerComponent

hideFocus

setFocus

showFocus

toString