MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manuale Utente Scaricare il pdf (Pagina 167)

Charting 167

In Flex 2, you set the value of the series’ itemRenderer property to a skin class that draws the

ChartItem’s icon:

<mx:PlotSeries itemRenderer="mx.charts.skins.halo.CrossSkin"/>

In addition, you can no longer use the AssetRenderer to use graphics in your charts. Instead,

you must use a class that implements the IDataObject interface.

Binding

In many cases, you declare a data provider object and bind the chart to that data provider. In

Flex 2, you must add the

[Bindable] metadata tag to the variable declaration, otherwise Flex

does not bind to the data. For example:

<mx:Script>

[Bindable] // Add this in Flex 2

public var expenses:Object = [{ ... }, { ... }, { ... }];

</mx:Script>

<mx:BubbleChart maxRadius="50" dataProvider="{expenses}"

mouseDown events

In Flex 1.5, mouseDown events included hitData structures, even if no data was under the

mouse’s pointer. In this case, the

hitData property existed, but it was null. This behavior was

a way to check for the existence of a click on a chart control.

In Flex 2,

mouseDown events do not include the hitData structure unless the mouse is

positioned over a data point. Instead, you must use the

mouseDownData event.

alpha

All aspects of charting that used an alpha property to represent transparency, such as Strokes

and Fills, now use 0 to 1 for a range of values rather than 1 to 100. For example:

Flex 1.x:

<mx:SolidColor color="0x7EAEFF" alpha="30"/>

Flex 2:

<mx:SolidColor color="0x7EAEFF" alpha=".3"/>

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MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manuale Utente Pagina 167