Macromedia flex 2-migrating applications to flex 2 Manual De Usuario

166

Additional Migration Issues

Skins

Skins are now called renderers. For example, the CandlestickSkin class is now 
CandlestickRenderer.

Renderers

Some functionality for the AxisRenderer was moved to other axis objects.

The 

labelFunction

 property, which was a property of AxisRenderer, is now a property of the 

axis type (such as CategoryAxis). The signature for the function is changed as well. Instead of 
a single parameter, 

the labelFunction()

 function now takes up to four. The new signature 

is as follows:

labelFunction(categoryValue:Object, previousCategoryValue:Object, 

axis:axis_type, categoryItem:Object); 

For more information on using the 

labelFunction

 property, see the Flex 2 Developer’s Guide.

The 

title

 property was also moved to the individual axis rather than the axis renderer. For 

example, in Flex 1.x you defined both the horizontalAxis and the horizontalAxisRenderer, as 
the following example shows:

<mx:horizontalAxis>

<mx:CategoryAxis dataProvider="{expenses}" categoryField="Month"/>

</mx:horizontalAxis>
<mx:horizontalAxisRenderer>

<mx:AxisRenderer title="Expenses" labelFunction="defineLabel"/>

</mx:horizontalAxisRenderer>

In Flex 2, you set the 

title

 and 

labelFunction

 properties on the horizontalAxis:

<mx:horizontalAxis>

<mx:CategoryAxis dataProvider="{expenses}" categoryField="Month"

title="Expenses" labelFunction="defineLabel"/>

</mx:horizontalAxis>

You no longer use renderers to change the appearance of ChartItems. In Flex 1.x, for example, 
you could specify a CrossRenderer or TriangleRenderer to draw a ChartItem as a cross or a 
triangle:

<mx:PlotSeries>

<mx:renderer>

<mx:CrossRenderer/>

</mx:renderer>

</mx:PlotSeries>