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Changing the height of the image

If you grab the thumb with the mouse and move it to the left or the right, two obvious visual effects occur. The first is that the value representedby the current position of the thumb is displayed above the thumb as shown in Figure 3.

(As you will see later, the value is also displayed in a Flex 4 application, but by default the appearance is white numerals on a blackbackground.)

Changing the height of the image.

Missing image.
Changing the height of the image.

The second visual effect

The second visual effect of moving the thumb is that the height of the image changes to the value represented by the position of the thumb on the slider.

(An Image object has a property named maintainAspectRatio . By default, the value of this propertyis true. Therefore, when the height is changed, the width changes in a proportional manner.)

Note that the upper-left corner of the image remains anchored to the same point as the height of the image changes as shown in Figure 3.

Discussion and sample code

The Flex 3 project named SliderChangeEvent 01

Creating the layout

Once you create your new Flex 3 Project, there are at least three ways that you can create your layout using Flex Builder 3:

  1. Select the Design tab in the upper-middle panel of the IDE (see Figure 5) and drag your containers, controls, and other components from the Components tab onto your design window.
  2. Select the Source tab in Figure 5 and write the raw XML code that defines your layout.
  3. A combination of 1 and 2 above

Expose the components tab

When you select the Design tab in the upper-middle window of the IDE, the lower-left window changes to the appearance shown in Figure 4 with theFlex 3 (mx) Components tab exposed.

Flex builder 3 components tab exposed.

Missing image.
Flex Builder 3 Components tab exposed.
The list of available components that you see in Figure 4 also appears when you create a new project in Flash Builder 4 and specify the use ofthe Flex 3 compiler.

A list of available components

Although they aren't all shown in Figure 4 due to space limitations, the Flex Builder 3 Components tab lists all of the components that you can use in your Flex application grouped into the following categories:

  • Custom
  • Controls
  • Layout
  • Navigators
  • Charts

Expose the design window

Selecting the Design tab mentioned above also exposes the Flex Builder 3 designwindow shown in Figure 5.

Drag controls onto the flex builder 3 design tab.

Missing image.
Drag controls onto the Flex Builder 3 Design tab.
A similar design window is exposed when you create a new project in Flash Builder 4 specifying the Flex 3 compiler and then select the Design tab. The purpose is the same but some of the items at the top of the design window in Flash Builder 4 are different.

Drag components onto the Design tab

You can drag components from the Components tab shown in Figure 4 onto the Design tab shown in Figure 5 to create your layout in the Flex Builder 3design mode or in the Flash Builder 4 design mode. As you do that, the corresponding XML code is automatically generated for you.

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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