<< Chapter < Page Chapter >> Page >

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.

Preview

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

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Introduction to xml. OpenStax CNX. Dec 02, 2014 Download for free at https://legacy.cnx.org/content/col11207/1.18
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Introduction to xml' conversation and receive update notifications?

Ask