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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

are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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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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