MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manual do Utilizador descarregar pdf (Página 101)

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CHAPTER 4

Data Providers

This topic describes migrating data providers, including the dataProvider property of Flex

controls and the ways you access and manipulate the data represented by the

dataProvider

property. For detailed information on using data providers in Flex 2, see Chapter 7, “Using

Data Providers and Collections,” in Flex 2 Developer’s Guide.

The DataProvider interface and class no longer exist and have been replaced by the collection

package hierarchy. However, you still use the

dataProvider property to specify the source of

the data in a control such as DataGrid or Menu. The collection classes include methods for

manipulating the underlying data and the view of that data that is displayed in the control.

The collection package includes the following interfaces and classes:

■ IList, ICollectionView, and IViewCursor interface, and the CursorBookmark class which

you use to access and manipulate data. The ICollectionView interface can represent a

sorted or filtered subset of data without modifying the underlying data.

■ ArrayCollection class, which implements the IList and ICollectionView interface using a

backing Array.

■ XMLListCollection which implements the IList and ICollectionView interface using a

backing E4X XML object.

■ Sort, and SortField for sorting the data representation of an ICollectionView.

■ ItemResponder, for handling remote paged collections.

■ ListCollectionView, a building-block class used by XMLListCollection and

ArrayCollection.

For detailed descriptions of all interfaces and classes, see the collection package in Adobe Flex 2

Language Reference. For documentation on using the package interfaces and classes, see

Chapter 7, “Using Data Providers and Collections,” in Flex 2 Developer’s Guide.

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MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manual do Utilizador Página 101