<< 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.


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

how did psychology begin?
Valerie Reply
of psychologys commencement, the traces can be seen in the work of Aristotle, where he talk about soul and body, likewise work in durrant, de anima, all these were somewhere supporting dualism, in which soul could exist separately from body
but if you talk about the moder psychology, Gustav fechner, is credited with performing scientific experiments, basis of his experiments in psychology with his studies perception.
does psychology deal with love?
Mohammed Reply
Maybe, i think
I definitely would say yes
how so
there are so many different reasons why you can fall in love with someone, many of them develope subconsciously -> psychology
love messes with the brain, a lot, ergo I believe that Psychology does indeed deal with love
what is synapse
Katie Reply
In the central nervous system, a synapse is a small gap at the end of a neuron that allows a signal to pass from one neuron to the next. synapse are found where nerve cells connect with other nerve cells
can you do auto book auto
Mariah Reply
WHT u mean?
heyy, may i join the conversation please?
edem Reply
who is the father of psychology
Richy Reply
and please, how would you guys, describe the study of psychology at college ?
psychologist student?
i mean not yet but am about to start college so wanna know how is it(college in general and psychology course) please
Psychology is the study of mind and behaviour. So if you will take psychology as a subject so you will get to know how your everything (physical, mental, social, spiritual aspects) effects your behaviour
With this brief knowledge you can help people to cope up with their problems and only you can guide them correctly
And if you go for further specialisations you can study hypnosis, face reading, body language etc
Thanks a lot🙏🏾 And ik some of the stuffs u said but i am also going to write thesis, right ?
ok no prob, thanks a lot🙏🏾✨
hae everyone, hope you are well this evning my question is what is the difference between drive and motivation
good question
drive is more like an impulse or urge and i think they both go together (drive and motivation) even if there is a slight difference
@ Michael Drive is delivered to be innate without the use of an external stimuli, motivation normally evolves an outside stimuli which may include praise, appreciate, or reward.
*believed...sorry for typo
@Reginald, can't the motivation come from the inner self?
Good question, please give an example.
can we say desire of success for example
Wilhelm Wundt is the father of psychology
Wilhem Wundt thank you for the road that you opened.
You mean who is the father of having a great educated argumentative guess? nothing is more wrong than this question. The question is you should ask yourselfs is, how sure are you abour their scientific studying? one's percieved assimilated approach to judging another person and saying they are
the biggest problem with scientific research and data is that ya you could get the same result 1000 times then it could go the other way 1000 times, but we would never know that and we did, we would still say ya but the proof is there. The only thing science proves is that humanity has
no facts about human behavior in the scientific context, but more in the trial and error.. sorry to tell you, but so far no one has proven Father of anything, thats up to you and i, judgement is bias, science is good enough lazy
cognitive development is the growing and development of the brain.
Jessy Reply
Anyone knows about Techno-fascism?
Hussein Reply
Ecofascism is a theoretical political model in which an authoritarian government would require individuals to sacrifice their own interests to the "organic whole of nature". The term is also used as a rhetorical pejorative to undermine the environmental movement.
what's the big difference between prejudice and discrimination?
Danice Reply
A prejudiced person may not act on their attitude.  Therefore, someone can be prejudiced towards a certain group but not discriminate against them.  Also, prejudice includes all three components of an attitude (affective, behavioral and cognitive), whereas discrimination just involves behavior
Nancy Lee
what is all about cognitive development?
cognitive development is the growing and development of the brain
how do you control a variable when using spss whilst running a pearsons correlation analysis?
Jessie Reply
it dependa on your study. according to what you want to say and explain your result
why does it say her and she
Jayla Reply
stages of cognitive development
brivia Reply
sensory preoperatinal concrete formal
what is psychology
Chethani Reply
the study of insecurities and the effect on the host .
Psychology is the scientific study of behavior & mental processes
psychology is science about learning human behaviour
In thinking about the case of Candace described earlier, do you think that Candace benefitted or suffered as a result of consistently being passed on to the next grade?
Nene Reply
what is reward
Angeles Reply
reward is a technique to change behaviour
Reward is a way to promote a specific behaviour or to teach someone/ something to behave a specific way or perform a specific task.
a reward is something that is usually associated with desirable behavior. The child got a reward for winning the game. A reinforcer is different in that a reinforcer is anything that increases behavior, even if it is increasing an undesirable behavior.
reward is earned effort realized
Got questions? Join the online conversation and get instant answers!
Jobilize.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?