Hi,
Here is my 2c
EntryClass.main is a static function, but you cannot guarantee that
mxml is going to compile your chart to a static variable - you can't
access non-static variables from a static function if I remember rightly...
What you probably want to do here, which would be a lot cleaner is
to create a new component in mxml or ActionScript that extends the VBox
component. This would have an applicationComplete event handler that
did the drawing, very quickly:
Here is the MXML file for your component - right click in the project
folder and create a new MXML Component if you are in FlexBuilder, make
sure it extends VBox and give it a name - MyChart or something, then
edit the source:
<?xml version="1.0" encoding="utf-8"?>
<mx:VBox creationComplete="redrawBG()"
xmlns:views="views.*"
xmlns:mx="http://www.adobe.com/2006/mxml"; width="400" height="300">
<mx:Script>
<![CDATA[
//add the creationComplete handler above and make it point
to this function:
private function redrawBG():void {
this.graphics.drawRect(100,100,100,100);
}
]]>
</mx:Script>
</mx:VBox>
If you put the component in the top level folder - same as your App
file, then you don't have to create another namespace. If you put it in
a folder, then you have to make a "namespace" for that to include it in
your App. The code above is stored in a folder called views, so you add
the extra attribute to the opening tag xmlns:views="views.*"
Then in your App, do the same to put your namespace in scope:
<?xml version="1.0"?>
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml";
xmlns:views="views.*"
applicationComplete="EntryClass.main()">
<mx:Panel>
<views:MyChart id="myChart" width="900" height="300" />
</mx:Panel>
</mx:Application>
Then that should be a bit neater - I would check out the video tutorials around
for doing this stuff in Flex, there are some really good ones that got me
started.
HTH
Glen
steve linabery wrote:
Hello Flashcoders,
Let's say I have two files, myApp.mxml:
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";
applicationComplete="EntryClass.main()">
<mx:Panel>
<mx:VBox id="myChart" width="900" height="300" />
</mx:Panel>
</mx:Application>
and EntryClass.as:
package {
public class EntryClass {
public static function main():void {
myChart.graphics.drawRect(100,100,100,100);
}
}
}
Why does "mxmlc myApp.mxml" complain with this error message:
quote:
/path/to/EntryClass.as(4): col: 7 Error: Access of undefined
property myChart.
myChart.graphics.drawRect(100,100,100,100);
^
According to devguide_flex3.pdf:
"The IDs for all tags in an MXML component, no matter how deeply
nested they are, generate public variables of the component being
defined. As a result, all id properties must be unique within a
document. This also means that if you specified an ID for a component
instance, you can access that component from anywhere in the
application: from functions, external class files, imported
ActionScript files, or inline scripts."
I thought perhaps this would work:
package {
public class EntryClass {
public static function main():void {
var mxmlApp:Application = Application(Application.application);
mxmlApp.myChart.graphics.drawRect(100,100,100,100);
}
}
}
but mxmlc complains about this with:
/path/to/EntryClass.as(7): col: 15 Error: Access of possibly undefined
property myChart through a reference with static type
mx.core:Application.
Any suggestions appreciated!
Thanks,
Steve
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Glen Pike
01326 218440
www.glenpike.co.uk <http://www.glenpike.co.uk>
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