Adding objects to the stage & acceessing stage properties - I'm a bit confused..

Hi,
I'm a little confused on two fronts regarding display
programming:
A. What the best way to add objects to the stage?
B. How to access stage properties.
I can do both of these when the project is an 'Action Script
Project', but I'm having trouble when it is a 'Flex Project' (e.g.
an MXML file). See the two attached files with questions included
in the comment to see exactly what I mean.
A. What the best way to add objects to the stage?
=====================================
In an action script project that extends Sprite I can just
call addChild()
In an MXML project I can add objects to the stage by first
adding them to a UIComponent, then adding that to the stage.
1. Is that the best way to do it?
In this doc:
http://livedocs.adobe.com/flex/3/html/help.html?content=05_Display_Programming_02.html
it says that
quote:
Each SWF file has an associated ActionScript class, known as
the main class of the SWF file. When Flash Player opens a SWF file
in an HTML page, Flash Player calls the constructor function for
that class and the instance that is created (which is always a type
of display object) is added as a child of the Stage object. The
main class of a SWF file always extends the Sprite class
2. why cant I just add a sprite object direct to the stage
without the UIComponent?
3. What is the 'main class', and how can i get access to it?
B. How to access stage properties.
=========================
In an action script project that extends Sprite I can just
call trace(stage.framerate)
But in an MXML file I cannot figure out how to access the
stage properties.
See the attached code for the things that I tried, but which
didnt work.
In the page:
http://www.actionscript.org/forums/showthread.php3?t=140655
It says
quote:
For stage access you have a couple of rules:
* natively, only display objects have inherent access to
stage
* display objects only have a valid reference to stage if
they're within the stage's display list (on the screen, after added
to it with addChild)
* The only display objects which immediately have access to
the stage before the use of addChild (in their constructor) are the
document/application class instance (root) and any instance from
the library placed on the timeline (not created with AS).
* Non-display object classes have to be passed or assigned a
reference to the stage from another object which already has access
to it - they cannot access it otherwise.
4. How do I access the stage properties in the MXML project?
5. I suspect this is related to the "main class", which I
dont yet understand - is it?
Sorry for the long post.
cheers
tom

"tom saffell" <[email protected]> wrote in
message
news:gd7cm9$d1v$[email protected]..
> Thanks Luigi - that helps a lot.
> I hadnt seen the Flex 3 Developer Guide before - it's
very useful.
>
> I now see that I can access properties of the
application object directly
> with
> this.<property>.
> However, the framerate property cannot be set by
actionscript, only in
> MXML (I
> can set it in the <mx:application> tag). But I
need to be able to set it
> programatically, dependent on user input.
>
> 5. Is there a way around this?
> 6. Can I set the stage's framerate to achieve the same
outcome?
>
> I still dont understand why I cannot access the stage
object. When I call
> either
this.stage or
uic.stage * then I get
quote:
Cannot access
> a
> property or method of a null object reference.
My understanding is
> that I
> can access the stage object via any display object on
the display list.
> I'm
> confused about this bit..
>
> * - uic is a UIComponent that has been added to the
display list (i think)
> by
> calling addChild(uic) from the AS3 within the
application
>
> 7. How do I access stage properties in AS3 in an MXML
project?
http://www.adobe.com/livedocs/flex/3/html/help.html?content=05_Display_Programming_10.html
It seems like possibly your real problem is that you're
having trouble
searching the Help effectively:
http://flexdiary.blogspot.com/2008/07/getting-help-in-flex-builder.html

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I created a vector and added objects, but the vector is empty

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Press any key to continue . . .
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are you reffering to where i have public class
Facilitys extends Vector {
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That's correct. That's your problem.
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C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
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symbol : method size()
location: class Facilitys
System.out.println("There are "+entries.size()+"
" entries");That's because you haven't implemented a size method in your class.
^
C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
a:17: cannot find symbol
symbol : method setElementAt(Facility,int)
location: class Facilitys
entries.setElementAt(new
w Facility("lighting","1.34"), 2);That's because you haven't implemented setElementAt in your class.
C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
a:21: cannot find symbol
symbol : method remove(int)
location: class Facilitys
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Adding objects to the stage & acceessing stage properties - I'm a bit confused..

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