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Purpose of the class

The purpose of this class is to define the characteristics of an object that will serve as a driver to exercise and to illustrate the behavior of objects ofthe following custom classes:

  • ButterflyButton
  • FrogButton
  • FancyButton

Inheritance in action

Note that this class extends the standard Flex/ActionScript class named HBox . Thus, an object of the Driver class inherits all of the characteristics defined into the HBox class and adds more characteristics that are unique to an object of the Driver class.

For example, one of the important characteristics inherited from the HBox class is the ability to arrange child components horizontally as shown in Figure 2.

Instantiate custom button objects

Listing 2 instantiates objects of the three custom classes listed above and stores references to those objects in private instance variables with the following names:

  • bFlyButton
  • frogButton
  • fancyButton

Storing the references as private instance variables makes them accessible to the constructor and to methods defined within the Driver class, but makes them inaccessible otherwise.

The constructor for the Driver class

Listing 3 defines the constructor for the Driver class.

The constructor for the driver class.

public function Driver(){//constructor addChild(bFlyButton);addChild(frogButton); addChild(fancyButton);fancyButton.addEventListener(MouseEvent.CLICK,buttonHandler); }//end constructor

Listing 3 begins by adding the three objects instantiated in Listing 2 to the object being constructed, which is possible because an object of the Driver class is an HBox container. (See the earlier section titled The ISA relationship .)

Then Listing 3 registers a click event handler method named buttonHandler on the FancyButton object.

The method named buttonHandler

The click event handler method named buttonHandler is shown in Listing 4.

The method named buttonhandler .

private function buttonHandler( event:MouseEvent):void{fancyButton.toggleSkin(); }//end buttonHandler}//end class }//end package

This method is executed each time the FancyButton object fires a click event. When the method is executed, it calls the toggleSkin method on the FancyButton object. As you will see later, the toggleSkin method causes the FancyButton object to toggle its skins between butterfly images and frog images.

The end of the Driver class

Listing 4 also signals the end of the class named Driver .

The file named FancyButton.as

The FancyButton class begins in Listing 5. A complete listing of the class file is provided in Listing 10 near the end of the lesson.

Define a custom button using skins

This class defines a custom button using skins. When the program starts, frog images are used to define the button's skins as shown by the rightmost button inFigure 2. Each time the toggleSkin method is called, the skin switches between frog images and butterfly images.

Beginning of the fancybutton class.

package CustomClasses{ import mx.controls.Button;public class FancyButton extends Button{[Embed("/Images/frogup.jpg")] private var frogUp:Class;[Embed("/Images/frogover.jpg")] private var frogOver:Class;[Embed("/Images/frogdown.jpg")]private var frogDown:Class;[Embed("/Images/frogdisabled.jpg")] private var frogDisabled:Class;[Embed("/Images/bflyup.jpg")]private var bFlyUp:Class;[Embed("/Images/bflyover.jpg")] private var bFlyOver:Class;[Embed("/Images/bflydown.jpg")]private var bFlyDown:Class;[Embed("/Images/bflydisabled.jpg")] private var bFlyDisabled:Class;

Questions & Answers

Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
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
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
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
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Source:  OpenStax, Object-oriented programming (oop) with actionscript. OpenStax CNX. Jun 04, 2010 Download for free at http://cnx.org/content/col11202/1.19
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