DefaultDataDescriptor

Pacchetto	mx.controls.treeClasses
Classe	public class DefaultDataDescriptor
Ereditarietà	DefaultDataDescriptor Object
Implementa	ITreeDataDescriptor2, IMenuDataDescriptor

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The DefaultDataDescriptor class provides a default implementation for accessing and manipulating data for use in controls such as Tree and Menu. This implementation handles e4x XML and object nodes in similar but different ways. See each method description for details on how the method accesses values in nodes of various types. This class is the default value of the Tree, Menu, MenuBar, and PopUpMenuButton control dataDescriptor properties.

Elementi API correlati

mx.controls.treeClasses.ITreeDataDescriptor
mx.controls.menuClasses.IMenuDataDescriptor
mx.controls.Menu
mx.controls.MenuBar
mx.controls.PopUpMenuButton
mx.controls.Tree

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

Metodi pubblici

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	Metodo		Definito da
		DefaultDataDescriptor() Constructor.	DefaultDataDescriptor
		addChildAt(parent:Object, newChild:Object, index:int, model:Object = null):Boolean Add a child node to a node at the specified index.	DefaultDataDescriptor
		getChildren(node:Object, model:Object = null):ICollectionView Provides access to a node's children.	DefaultDataDescriptor
		getData(node:Object, model:Object = null):Object Returns a node's data.	DefaultDataDescriptor
		getGroupName(node:Object):String Returns the name of the radio button group to which the node belongs, if any.	DefaultDataDescriptor
		getHierarchicalCollectionAdaptor(hierarchicalData:ICollectionView, uidFunction:Function, openItems:Object, model:Object = null):ICollectionView Returns an ICollectionView instance that makes the hierarchical data appear as if it was a linear ICollectionView instance.	DefaultDataDescriptor
		getNodeDepth(node:Object, iterator:IViewCursor, model:Object = null):int Returns the depth of the node, meaning the number of ancestors it has.	DefaultDataDescriptor
		getParent(node:Object, collection:ICollectionView, model:Object = null):Object Returns the parent of the node The parent of a top-level node is null.	DefaultDataDescriptor
		getType(node:Object):String Returns the type identifier of a node.	DefaultDataDescriptor
		hasChildren(node:Object, model:Object = null):Boolean Determines if the node actually has children.	DefaultDataDescriptor
		hasOwnProperty(name:String):Boolean Indica se per un oggetto è definita una proprietà specifica.	Object
		isBranch(node:Object, model:Object = null):Boolean Tests a node for termination.	DefaultDataDescriptor
		isEnabled(node:Object):Boolean Returns whether the node is enabled.	DefaultDataDescriptor
		isPrototypeOf(theClass:Object):Boolean Indica se un'istanza della classe Object si trova nella catena di prototipi dell'oggetto specificato come parametro.	Object
		isToggled(node:Object):Boolean Returns whether the node is toggled.	DefaultDataDescriptor
		propertyIsEnumerable(name:String):Boolean Indica se la proprietà specificata esiste ed è enumerabile.	Object
		removeChildAt(parent:Object, child:Object, index:int, model:Object = null):Boolean Removes the child node from a node at the specified index.	DefaultDataDescriptor
		setEnabled(node:Object, value:Boolean):void Sets the value of the field or attribute in the data provider that identifies whether the node is enabled.	DefaultDataDescriptor
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche.	Object
		setToggled(node:Object, value:Boolean):void Sets the value of the field or attribute in the data provider that identifies whether the node is toggled.	DefaultDataDescriptor
		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

Descrizione della funzione di costruzione

()

Funzione di costruzione

public function DefaultDataDescriptor()

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Constructor.

Descrizione dei metodi

addChildAt

()

metodo

public function addChildAt(parent:Object, newChild:Object, index:int, model:Object = null):Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Add a child node to a node at the specified index. This implementation does the following:

If the parent parameter is null or undefined, inserts the child parameter at the specified index in the collection specified by model parameter.
If the parent parameter has a children field or property, the method adds the child parameter to it at the index parameter location. In this case, the model parameter is not required.
If the parent parameter does not have a children field or property, the method adds the children property to the parent. The method then adds the child parameter to the parent at the index parameter location. In this case, the model parameter is not required.
If the index value is greater than the collection length or number of children in the parent, adds the object as the last child.

Parametri

	`parent:Object` — The node object that will parent the child.

	`newChild:Object` — The node object that will be parented by the node.

	`index:int` — The 0-based index of where to put the child node relative to the parent.

	`model:Object` (default = `null`) — The entire collection that this node is a part of.

Restituisce

Boolean — true if successful.

getChildren

()

metodo

public function getChildren(node:Object, model:Object = null):ICollectionView

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Provides access to a node's children. Returns a collection of children if they exist. If the node is an Object, the method returns the contents of the object's children field as an ArrayCollection. If the node is XML, the method returns an XMLListCollection containing the child elements.

Parametri

	`node:Object` — The node object currently being evaluated.

	`model:Object` (default = `null`) — The collection that contains the node; ignored by this class.

Restituisce

ICollectionView — An object containing the children nodes.

getData

()

metodo

public function getData(node:Object, model:Object = null):Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns a node's data. Currently returns the entire node.

Parametri

	`node:Object` — The node object currently being evaluated.

	`model:Object` (default = `null`) — The collection that contains the node; ignored by this class.

Restituisce

Object — The node.

getGroupName

()

metodo

public function getGroupName(node:Object):String

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns the name of the radio button group to which the node belongs, if any. This method is used by menu-based controls.

Parametri

node:Object — The node for which to get the group name.

Restituisce

String — The value of the node's groupName attribute or field, or an empty string if there is no such entry.

getHierarchicalCollectionAdaptor

()

metodo

 public function getHierarchicalCollectionAdaptor(hierarchicalData:ICollectionView, uidFunction:Function, openItems:Object, model:Object = null):ICollectionView

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns an ICollectionView instance that makes the hierarchical data appear as if it was a linear ICollectionView instance.

Parametri

	`hierarchicalData:ICollectionView` — The hierarchical data.

	`uidFunction:Function` — A function that takes an Object and returns the UID, as a String. This parameter is usually the `Tree.itemToUID()` method.

	`openItems:Object` — The items that have been opened or set opened.

	`model:Object` (default = `null`) — The collection to which this node belongs.

Restituisce

ICollectionView — An ICollectionView instance.

getNodeDepth

()

metodo

public function getNodeDepth(node:Object, iterator:IViewCursor, model:Object = null):int

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns the depth of the node, meaning the number of ancestors it has.

Parametri

	`node:Object` — The Object that defines the node.

	`iterator:IViewCursor` — An IViewCursor instance that could be used to do the calculation.

	`model:Object` (default = `null`) — The collection to which this node belongs.

Restituisce

int — The depth of the node, where 0 corresponds to the top level, and -1 if the depth cannot be calculated.

getParent

()

metodo

public function getParent(node:Object, collection:ICollectionView, model:Object = null):Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns the parent of the node The parent of a top-level node is null.

Parametri

	`node:Object` — The Object that defines the node.

	`collection:ICollectionView` — An ICollectionView instance that could be used to do the calculation.

	`model:Object` (default = `null`) — The collection to which this node belongs.

Restituisce

Object — The parent node containing the node as child, null for a top-level node, and undefined if the parent cannot be determined.

getType

()

metodo

public function getType(node:Object):String

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns the type identifier of a node. This method is used by menu-based controls to determine if the node represents a separator, radio button, a check box, or normal item.

Parametri

node:Object — The node object for which to get the type.

Restituisce

String — The value of the type attribute or field, or the empty string if there is no such field.

hasChildren

()

metodo

public function hasChildren(node:Object, model:Object = null):Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Determines if the node actually has children.

Parametri

	`node:Object` — The node object currently being evaluated.

	`model:Object` (default = `null`) — The collection that contains the node; ignored by this class.

Restituisce

Boolean — true if this node currently has children.

isBranch

()

metodo

public function isBranch(node:Object, model:Object = null):Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Tests a node for termination. Branches are non-terminating but are not required to have any leaf nodes. If the node is XML, returns true if the node has children or a true isBranch attribute. If the node is an object, returns true if the node has a (possibly empty) children field.

Parametri

	`node:Object` — The node object currently being evaluated.

	`model:Object` (default = `null`) — The collection that contains the node; ignored by this class.

Restituisce

Boolean — true if this node is non-terminating.

isEnabled

()

metodo

public function isEnabled(node:Object):Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns whether the node is enabled. This method is used by menu-based controls.

Parametri

node:Object — The node for which to get the status.

Restituisce

Boolean — The value of the node's enabled attribute or field, or true if there is no such entry or the value is not false.

isToggled

()

metodo

public function isToggled(node:Object):Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns whether the node is toggled. This method is used by menu-based controls.

Parametri

node:Object — The node for which to get the status.

Restituisce

Boolean — The value of the node's toggled attribute or field, or false if there is no such entry.

removeChildAt

()

metodo

public function removeChildAt(parent:Object, child:Object, index:int, model:Object = null):Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Removes the child node from a node at the specified index. If the parent parameter is null or undefined, the method uses the model parameter to access the child; otherwise, it uses the parent parameter and ignores the model parameter.

Parametri

	`parent:Object` — The node object that currently parents the child node.

	`child:Object` — The node that is being removed.

	`index:int` — The 0-based index of the child node to remove relative to the parent.

	`model:Object` (default = `null`) — The entire collection that this node is a part of.

Restituisce

Boolean — true if successful.

setEnabled

()

metodo

public function setEnabled(node:Object, value:Boolean):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Sets the value of the field or attribute in the data provider that identifies whether the node is enabled. This method sets the value of the node's enabled attribute or field. This method is used by menu-based controls.

Parametri

	`node:Object` — The node for which to set the status.

	`value:Boolean` — Whether the node is enabled.

setToggled

()

metodo

public function setToggled(node:Object, value:Boolean):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Sets the value of the field or attribute in the data provider that identifies whether the node is toggled. This method sets the value of the node's toggled attribute or field. This method is used by menu-based controls.

Parametri

	`node:Object` — The node for which to set the status.

	`value:Boolean` — Whether the node is toggled.

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DefaultDataDescriptor - AS3 Flex

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