DragManager - Guida di riferimento alle API Adobe ActionScript® 3 (AS3 Flex)

Pacchetto	mx.managers
Classe	public class DragManager
Ereditarietà	DragManager Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The DragManager class manages drag and drop operations, which let you move data from one place to another in a Flex application. For example, you can select an object, such as an item in a List control or a Flex control, such as an Image control, and then drag it over another component to add it to that component.

All methods and properties of the DragManager are static, so you do not need to create an instance of it.

All Flex components support drag and drop operations. Flex provides additional support for drag and drop to the List, Tree, and DataGrid controls.

When the user selects an item with the mouse, the selected component is called the drag initiator. The image displayed during the drag operation is called the drag proxy.

When the user moves the drag proxy over another component, the dragEnter event is sent to that component. If the component accepts the drag, it becomes the drop target and receives dragOver, dragExit, and dragDrop events.

When the drag is complete, a dragComplete event is sent to the drag initiator.

Altri esempi

Dragging and dropping in sandboxed applications
Dragging and dropping in multi-versioned applications
The drag-and-drop operation

Elementi API correlati

mx.core.DragSource
mx.events.DragEvent
mx.core.UIComponent

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
		isDragging : Boolean [statico] [sola lettura] Read-only property that returns true if a drag is in progress.	DragManager

Metodi pubblici

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	Metodo		Definito da
		acceptDragDrop(target:IUIComponent):void [statico] Call this method from your dragEnter event handler if you accept the drag/drop data.	DragManager
		doDrag(dragInitiator:IUIComponent, dragSource:DragSource, mouseEvent:MouseEvent, dragImage:IFlexDisplayObject = null, xOffset:Number = 0, yOffset:Number = 0, imageAlpha:Number = 0.5, allowMove:Boolean = true):void [statico] Initiates a drag and drop operation.	DragManager
		getFeedback():String [statico] Returns the current drag and drop feedback.	DragManager
		hasOwnProperty(name:String):Boolean Indica se per un oggetto è definita una proprietà specifica.	Object
		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
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche.	Object
		showFeedback(feedback:String):void [statico] Sets the feedback indicator for the drag and drop operation.	DragManager
		toLocaleString():String Restituisce la rappresentazione in formato stringa di questo oggetto, formattato in base alle convenzioni specifiche per le versioni localizzate.	Object
		toString():String Restituisce la rappresentazione in formato stringa dell'oggetto specificato.	Object
		valueOf():Object Restituisce il valore di base dell'oggetto specificato.	Object

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

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	Descrizione	Definito da
copyCursor	Tipo: Class Ereditarietà CSS: No Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 3 Versioni runtime: Flash9, AIR 1.1 Cursor displayed during a copy operation. The default value is the "mx.skins.cursor.DragCopy" symbol in the Assets.swf file.	DragManager
defaultDragImageSkin	Tipo: Class Ereditarietà CSS: No Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 3 Versioni runtime: Flash9, AIR 1.1 Skin used to draw the default drag image, which is also called the drag proxy. Il valore predefinito è `mx.skins.halo.DefaultDragImage (for both Halo and Spark themes)`.	DragManager
linkCursor	Tipo: Class Ereditarietà CSS: No Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 3 Versioni runtime: Flash9, AIR 1.1 Cursor displayed during a link operation. The default value is the "mx.skins.cursor.DragLink" symbol in the Assets.swf file.	DragManager
moveCursor	Tipo: Class Ereditarietà CSS: No Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 3 Versioni runtime: Flash9, AIR 1.1 Cursor displayed during a move operation. The default value is the "mx.skins.cursor.DragMove" symbol in the Assets.swf file.	DragManager
rejectCursor	Tipo: Class Ereditarietà CSS: No Versione linguaggio: ActionScript 3.0 Versione prodotto: Flex 3 Versioni runtime: Flash9, AIR 1.1 Cursor displayed for a reject operation. The default value is the "mx.skins.cursor.DragReject" symbol in the Assets.swf file.	DragManager

Costanti pubbliche

	Costante		Definito da
		COPY : String = "copy" [statico] Constant that specifies that the type of drag action is "copy".	DragManager
		LINK : String = "link" [statico] Constant that specifies that the type of drag action is "link".	DragManager
		MOVE : String = "move" [statico] Constant that specifies that the type of drag action is "move".	DragManager
		NONE : String = "none" [statico] Constant that specifies that the type of drag action is "none".	DragManager

Descrizione delle proprietà

isDragging

proprietà

isDragging:Boolean [sola lettura]

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Read-only property that returns true if a drag is in progress.

Implementazione
public static function get isDragging():Boolean

Descrizione dei metodi

acceptDragDrop

()

metodo

public static function acceptDragDrop(target:IUIComponent):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Call this method from your dragEnter event handler if you accept the drag/drop data. Typically, you cast event.target to the data type of the drop target. In the following example, the drop target is an MX Canvas container:

DragManager.acceptDragDrop(Canvas(event.target));

Parametri

target:IUIComponent — The drop target accepting the drag.

doDrag

()

metodo

 public static function doDrag(dragInitiator:IUIComponent, dragSource:DragSource, mouseEvent:MouseEvent, dragImage:IFlexDisplayObject = null, xOffset:Number = 0, yOffset:Number = 0, imageAlpha:Number = 0.5, allowMove:Boolean = true):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Initiates a drag and drop operation.

Parametri

	`dragInitiator:IUIComponent` — IUIComponent that specifies the component initiating the drag.

	`dragSource:DragSource` — DragSource object that contains the data being dragged.

	`mouseEvent:MouseEvent` — The MouseEvent that contains the mouse information for the start of the drag.

	`dragImage:IFlexDisplayObject` (default = `null`) — The image to drag. This argument is optional. If omitted, a standard drag rectangle is used during the drag and drop operation. If you specify an image, you must explicitly set a height and width of the image or else it will not appear.

	`xOffset:Number` (default = `0`) — Number that specifies the x offset, in pixels, for the `dragImage`. This argument is optional. If omitted, the drag proxy is shown at the upper-left corner of the drag initiator. The offset is expressed in pixels from the left edge of the drag proxy to the left edge of the drag initiator, and is usually a negative number.

	`yOffset:Number` (default = `0`) — Number that specifies the y offset, in pixels, for the `dragImage`. This argument is optional. If omitted, the drag proxy is shown at the upper-left corner of the drag initiator. The offset is expressed in pixels from the top edge of the drag proxy to the top edge of the drag initiator, and is usually a negative number.

	`imageAlpha:Number` (default = `0.5`) — Number that specifies the alpha value used for the drag image. This argument is optional. If omitted, the default alpha value is 0.5. A value of 0.0 indicates that the image is transparent; a value of 1.0 indicates it is fully opaque.

	`allowMove:Boolean` (default = `true`) — Indicates if a drop target is allowed to move the dragged data.

getFeedback

()

metodo

public static function getFeedback():String

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns the current drag and drop feedback.

Restituisce

String — Possible return values are DragManager.COPY, DragManager.MOVE, DragManager.LINK, or DragManager.NONE.

showFeedback

()

metodo

public static function showFeedback(feedback:String):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Sets the feedback indicator for the drag and drop operation. Possible values are DragManager.COPY, DragManager.MOVE, DragManager.LINK, or DragManager.NONE.

Parametri

feedback:String — The type of feedback indicator to display.

Descrizione delle costanti

COPY

Costante

public static const COPY:String = "copy"

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Constant that specifies that the type of drag action is "copy".

LINK

Costante

public static const LINK:String = "link"

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Constant that specifies that the type of drag action is "link".

MOVE

Costante

public static const MOVE:String = "move"

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Constant that specifies that the type of drag action is "move".

NONE

Costante

public static const NONE:String = "none"

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Constant that specifies that the type of drag action is "none".

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DragManager - AS3 Flex

Classi x

isDragging

acceptDragDrop

doDrag

getFeedback

showFeedback

COPY

LINK

MOVE

NONE