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Discussion and sample code

Will explain in fragments

I will explain the code for this program in fragments. Complete listings of the MXML code and the ActionScript code are provided in Listing 16 and Listing17 near the end of the lesson.

The MXML file

The MXML file is shown in Listing 1 and also in Listing 16 for your convenience.

He mxml file for draganddrop01.

<?xml version="1.0" encoding="utf-8"?><!--DragAndDrop01--><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"xmlns:cc="CustomClasses.*"><cc:Driver/></mx:Application>

As you can see, the MXML file is very simple because the program was coded almost entirely in ActionScript.The MXML code simply instantiates an object of the Driver class. From that point forward, the behavior of the program is controlled by ActionScript code.

The ActionScript file

Beginning of the Driver class

The Driver class begins in Listing 2.

Beginning of the driver class for draganddrop01.

package CustomClasses{ import flash.events.MouseEvent;import mx.containers.Canvas;import mx.controls.Image; import mx.core.DragSource;import mx.events.DragEvent; import mx.events.FlexEvent;import mx.managers.DragManager; //====================================================//public class Driver extends Canvas {private var imageA:Image = new Image(); private var imageB:Image = new Image();private var imageC:Image = new Image(); private var localX:Number;private var localY:Number;

Extends the Canvas class

As you can see in Listing 2, the Driver class extends the Canvas class. Therefore, an object of the Driver class is a Canvas object and has all of the attributes associated with a Canvas object. Among those attributes is the following, which was taken from the documentation :

"A Canvas layout container defines a rectangular region in which you place child containers and controls. It is the onlycontainer that lets you explicitly specify the location of its children within the container by using the x and y properties of each child."

As you will see, the new location of each image is explicitly specified each time it is dragged to a new location.

Instantiate three new Image objects

The code in Listing 2 instantiates three new Image objects, which will be loaded with the contents of the three image files listed earlier . The code in Listing 2 also declares two instance variables that will be used to store the position of the mouse pointer within animage when the drag operation is initiated.

Beginning of the constructor for the Driver class

The constructor for the Driver class begins in Listing 3.

Beginning of the constructor for the driver class.

public function Driver(){//constructor setStyle("backgroundColor",0x00FFFF);setStyle("backgroundAlpha",1.0);

Make the canvas visible

Normally a Canvas object is not visible. The code in Listing 3 sets the alpha value for the Canvas object to 1.0 making it opaque and visible. Listing 3 also sets the background color of the Canvas object to cyan as shown in Figure 1.

The size of the Canvas object will be set later when the Canvas object and all of its children have been constructed.

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
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.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Mueller Reply
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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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