41⟩ How do we overload functions in actionscript?
Method overloading using namespaces. (?)
Adobe Flex Actionscript
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84 Adobe Flex Actionscript Questions And Answers
42⟩ How polymorphism works on actionscript?
class UnpaidIntern extends Employee {
override public function receivePayment():Number {
return 0;
}
}
class Manager extends Employee {
override public function receivePayment():Number {
return baseSalary*3;
}
}
class Engineer extends Employee {
override public function receivePayment():Number {
return this.baseSalary*2;
}
}
class Employee {
internal var baseSalary:Number = 1000;
public function receivePayment():Number {
return this.baseSalary;
}
}
43⟩ What is dynamic keyword used for in actionscript?
Dynamic classes, which allow you to programmatically add new properties and behavior to classes during the run-time. Just add the magic keyword dynamic to the class definition:
dynamic class Person {
var name:String;
}
Now let’s add dynamically two variables name and age and the function printme() to the object of type Person:
Person p= new Person();
p.name=”Joe”;
p.age=25;
p.printMe = function () {
trace (p.name, p.age);
}
p.printMe(); // Joe 25
44⟩ What are sealed classes in flex?
A sealed class possesses only the fixed set of properties and methods that were defined at compile-time; additional properties and methods cannot be added. This makes stricter compile-time checking possible, resulting in more robust programs.
45⟩ What are runtime shared libraries in flex?
Macromedia Flex 1.5 you can build runtime shared libraries (RSLs) that can be individually loaded, cached, and used by multiple applications.
Use Flex 3 runtime-shared-libraries (RSLs) to reduce the size of your applications and thereby reduce the time required to download the application. RSLs are just SWF files whose code is used as a shared library between different application SWF files. There are two kinds of RSLs, signed and unsigned. Signed RSLs are libraries that are signed by Adobe and may be stored in the Flash Player Cache, which can be accessed by applications from any domain. This means if your application is using a signed RSL, the RSL may not even need to be downloaded if the RSL is already in the Flash Player Cache. The signed RSL may have been put into the Flash Player Cache by visiting another web site that was using the same signed RSL. Signed RSLs have a "swz" extension.
Unsigned RSLs are normal SWF files and are not loaded into the Flash Player Cache. Instead, these RSLs rely on the browser's cache to keep them from being downloaded.
46⟩ What is cairnghorm in flex? how do we use it?Have you worked with Cairnghorn in flex?
Cairngorm is the lightweight micro-architecture for Rich Internet Applications built in Flex or AIR. A collaboration of recognized design patterns, Cairngorm exemplifies and encourages best-practices for RIA development advocated by Adobe Consulting, encourages best-practice leverage of the underlying Flex framework, while making it easier for medium to large teams of software engineers deliver medium to large scale, mission-critical Rich Internet Applications.
The benefits of the Cairngorm architecture are realized when developing complex RIA applications with multiple use-cases and views, with a team of developers, and with a multi-disciplinary development team that includes designers as well as creative and technical developers.
How is the MVC pattern carried out in a Flex + Cairngorm application?
- Model:???? Role of the ModelLocator & Model Objects
- View:???? Role of View Components & Event Objects
- Controller: Role of the FrontController & Command Objects
47⟩ What design patterns have you used? in Actionscript and java?
1. Creational Pattern
* Factory Method Pattern
* Singleton Pattern
2. Structural Patterns
* Decorator Pattern
* Adapter Pattern
* Coposite Pattern
3. Behavioral Patterns
* Command Pattern
* Observer Pattern
* Template Metod Pattern
* State Pattern
* Strategy Pattern
4. Multiple Patterns
* MVC Pattern
* Symetric Proxy Pattern
48⟩ What keyword allows us to implement abstraction better in flex?
Flex does not support abstart class directly.
49⟩ Explain how binding works in mxml components in flex?
Binding in MXML
Lets look at the following code…
<mx:TextInput id=”ti1?/>
<mx:Label id=”label1? text=”{ti1.text}”/>
Here you are binding the text property of the TextInput to the label. So whatever you type in the textInput automatically reflects in the label. That’s the power of Binding…
The best practice for defining components that return information back to the main application is to design the component to dispatch an event that contains the return data. In that way, the main application can define an event listener to handle the event and take the appropriate action. You also use events in data binding. The following example uses the Bindable metadata tag to make useShortNames a bindable property. The implicit setter for the useShortNames property dispatches the change event that is used internally by the Flex framework to make data binding work.
50⟩ Why would you want to keep a reference to a ChangeWatcher and call unwatch()?
So we can reattach the watcher again & We can change the source object (of changewatcher) by reset method.
The ChangeWatcher class defines utility methods that you can use with bindable Flex properties. These methods let you define an event handler that is executed whenever a bindable property is updated.
unwatch () method:
Detaches this ChangeWatcher instance, and its handler function, from the current host. You can use the reset() method to reattach the ChangeWatcher instance, or watch the same property or chain on a different host object.
public function unwatch():void
51⟩ I need to load an image from flickr into my application. Do I need a crossdomain.xml file on flickr?
File is already there , we need to register our ip address to flicker’s crossdomain.xml
Since the images are located on a flickr server like farm1.static.flickr.com and there is no crossdomain.xml file on that server (there is a crossdomain.xml for api.flickr.com so you can use the api) that means you can’t get access to the bitmapData of the loaded images when you load them from flickr. This is dumb, but that’s the way it is. So you can load images just fine, but the reflection class copies the bitmapData of the image, so that doesn’t work if you load them straight from the flickr server. I also wanted to set bitmap smoothing to true on the images so the thumbnails don’t look as pixelated, and that also requires access to the bitmapData of the loaded image.
So the answer is to create a proxy that loads the flickr image so it appears to come from the same domain.
52⟩ How do you implement push on a flex applications?
Using BlazeDS Server, LiveCycle Data Services
53⟩ Is it possible to make httpService Requests synchronous in adobe flex?
No.
Basically, what we are about to do is creating XMLHttpRequest with Javascript in Flex, and calling a server data with the parameters we will give to the object.
e.g. xmlHttpRequest.open("GET","http://localhost/Default.aspx",false);
1. Request Type: GET or POST
2. Requested URL
3. Communication Type: true for asynchronous, false for synchronous.
54⟩ What is the difference between httpService and Data Service?
The services-config.xml configuration file is required at compile time if the Flex application uses Flex Data Services. In the case of RPC services, this applies to all applications that use RemoteObject or proxy-based WebService or HTTPService.
55⟩ How do you generate random numbers within a given limit with actionscript?
Math.round(Math.random() * (high - low)) + low
56⟩ Have you built any components with actionscript? If so explain how you did it?
CountryComboBox.as
package components
{ import mx.controls.ComboBox;
public class CountryComboBox extends ComboBox
{ public function CountryComboBox()
{ dataProvider = [ "United States", "United Kingdom" ];
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns:custom="components.*"
width="220" height="115"
>
<custom:CountryComboBox />
</mx:Application>
57⟩ I am going to add images into a tag. How will it resize itself in adobe flex actionscript?
To let Flex resize the image as part of laying out your application, set the height or width properties to a percentage value. Flex attempts to resize components with percentage values for these properties to the specified percentage of their parent container.
Or by default, Flex does not resize the image. The scaleContent property has a default value of true, therefore, Flex scales the image as it resizes it to fit the specified height and width. The aspect ratio is maintained by default, so the image may not completely fill the designated space. Set the scaleContent property to false to disable scaling. Set the maintainAspectRatio property to false to allow an image to fill all available space regardless of its dimensions.
58⟩ Explain What is the function of trace?
A. Initiate the automatic debugging procedure.
B. Discover who has downloaded your movie.
C. Send String Values to the output panel.
D. Determine what objects are presents on stage ant any one time.
59⟩ What are the correct statements consenting text field?
A. Embedded font outlines are shared by text fields using the same font.
B. Font Outlines for static for static text field are embedded in the SWF file by default.
C. Font outline for input text field are embedded in SWF file by default.
D. Individual font outlines are embedded in to the SWF file for each text field in the FLA file.
E. Font outlines for dynamic text fields are embedded in SWF file by default.
60⟩ Explain How many levels does Flash MX support?
A. 20
B. 80
C. 100
D. 1000
