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Skeleton mxml code for a new flex 3 project.

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"layout="absolute" minWidth="955"minHeight="600"></mx:Application>

Compile and run the project

You can compile and run the new project by selecting either Run or Debug on the Run menu. (The IDE provides a few other ways to run the project as well.) The new project should open in your browser looking pretty much like Figure 2. (Remember, gray background for Flex 3 and white background for Flex 4.) If you selected Debug , some debug text information should be displayed in the Console tab at the bottom of the IDE.


In this lesson, I will explain how to create two Flex projects. One is a simple Flex 3 project named AppBackground01 . The other is a (not so simple) Flex 4 project named AppBackground03 that replicates the output from the Flex 3 project.

Both projects are designed to produce the same output. To create the project using Flex 3, you will simply add attributesto the Application element shown in Listing 1, resulting in the XML code shown in Listing 2. However, you will need to do more than that to create theproject in Flex 4. (Remember, Flex 4 is more powerful but also more complicated to use.)

Finally, I will show you the output from another Flex 4 project and challenge you as the student to write a Flex 4 project that produces a matching output.

More complex Flex projects

In general, to create more complex Flex projects, you will also need to add child elements, (which may or may not include attributes) , to the Application element.

To incorporate logic in your Flex projects, you will need to learn how to write some ActionScript code and embed ActionScript code in your Flex code (or integrate ActionScript code in other ways) .

Layout versus behavior

As I mentioned earlier, you can develop your Flex applications using the XML-based Flex language to establish the layout for your application.

Although it is possible to use Flex alone to provide simple behavior for your applications (simple event handling for example) , you will probably need to use ActionScript 3 to produce more complex behavior for your applications. (Even the simple behavior requires some ActionScript, but it's not so obvious where the Flex code ends and the ActionScript code begins.)

The layout capability in Flex 3 consists of containers (that may contain other containers) with names like Canvas , HBox , VBox , etc. The containers can also contain controls with names like Button , CheckBox , ComboBox , etc.

The text editor

The upper-middle pane in the Flash Builder 4 IDE has two tabs labeled Source and Design . If you select the Source tab, this upper-middle pane becomes a text editor in which you can edit XML and ActionScript code. Inaddition, the lower-left pane becomes an outline showing the hierarchical structure of your XML or ActionScript code.

The visual design editor

If you select the Design tab, the upper-middle pane becomes a visual design editor and the lower-left pane becomes a toolbox containing a variety of components including Controls, Layouts, Navigators, and Charts. (Note that there are differences in the component sets for Flex 3 and Flex 4.) In this mode, you can drag components from the lower-left pane into the design paneand make physical adjustments to their location, length, width, etc.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
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Source:  OpenStax, Introduction to xml. OpenStax CNX. Dec 02, 2014 Download for free at https://legacy.cnx.org/content/col11207/1.18
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