MACROMEDIA FLEX-GETTING STARTED WITH FLEX Bedienungsanleitung PDF herunterladen (Seite 96)

while( mile < miles ) {

weeks += 1;

mile *= 1.1;

}

txtWeeks.text = weeks.toString();

}

]]>

</mx:Script>

<mx:Form>

<mx:FormItem label="Target Miles">

<mx:TextInput id="txtMiles" change="onMilesChange(event)"

text="3.1" />

</mx:FormItem>

<mx:FormItem label="Weeks">

<mx:Label id="txtWeeks" />

</mx:FormItem>

</mx:Form>

</mx:Application>

The application is split into two pieces. The calculation func-

tion, onMilesChange, is located at the top of the script. The user

interface is a form containing a text input for the number of

miles and a label for the number of weeks. There is an event

handler on the creationComplete event from the application

which calls onMilesChange to do the initial calculation. There

is also an event handler on the text field that calls onMile

sChange whenever the change notification is fired.

Figure 6-1 shows the runner’s calculator on startup.

I can change the target number of miles and watch as the num-

ber of weeks changes as a result. Figure 6-2 shows what hap-

pens when I change the target miles to 2.5.

It’s nice to know the number of weeks, but what if I want to

create a training calendar? I need to know the number of miles

for each week as I go. I actually calculated the data I need in

the onMilesChange function already; I just need to store it and

display it somewhere. So, I’ll update the Flex code a little bit,

as shown in Example 6-2.

80 | Chapter 6: More Flex Applications

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MACROMEDIA FLEX-GETTING STARTED WITH FLEX Bedienungsanleitung Seite 96