ActionScript 3.0 :: Flex - Tell If An Instance Implements An Interface
Sep 3, 2009
I am overriding the addItem() function of an array collection and I would like to detect if the added item implements a particular interface. Previously I used the, is operator to detect the class type, but now that I am using an interface for classes I would rather test to see if the object implements the interface. I expect I could just try and cast the object as the interface and see if it's not null. Is this the best way to do it? I could also just create a new addFunction() that only accepts objects of the interface type.
Is there a way to generate an instance of a class that implements an interface based on the name of the class?
I am trying:
var ClassReference:Object = getDefinitionByName("movement.OuterSpaceMovement") as IMovement; var m:IMovement = new ClassReference as IMovement; trace("startup..." + m);
-But I am getting an error message ReferenceError: Error #1065 (OuterSpaceMovement) not defined.
I have several classes that implement the same interface (IMovement) but I need to be able to generate new instances of these classes and then pass these instances as a datatype (IMovement datatype) to other classes...
So then I tried:
var ClassReference:Class = getDefinitionByName("OuterSpaceMovement") as Class; var m:IMovement = new ClassReference() as IMovement; and this doesn't seem to work...but the following var m:IMovement = new OuterSpaceMovement();
Not sure if this is possible but I would like to reflect a swf or swc file selected by the user at runtime to find any classes that implement a certain interface. Can this be done or do you actually need a reference to the class you want to reflect using describeType();
In ActionScript 3.0, there are a few ways to check a class's extension. For example, if I want to know of a custom class extends Sprite I could use the is operator: trace(MyClass is Sprite); Or I could use flash.utils.getQualifiedSuperclassName: trace(getQualifiedSuperclassName(MyClass));
I would like to accept a class as an argument and check to see if the passed class implements an certain interface. Is there an equally simple or common way to check if my custom class adheres to an interface? Perhaps something like: trace(MyClass implements IMyInterface);
I'm trying to load a RSL library into a flash animation developed with Flash CS5 IDE, that extends a custom class and implements an interface. I have reduced the problem to the simplest setup and find that I can have my main class extend another class or implement an interface, but not do both at the same time if I want to load an RSL.I have a very simple class to extend:
import flash.display.Sprite; public class MySprite extends Sprite {[ code]...........
but if I want both I get the VerifyError: Error #1014 with MySprite not found and ReferenceError: Error #1065.
function someFunction(classParam:Class):Boolean { // how to know if classParam implements some interface? } i.e. Comparing classParam with IEventDispatcher interface
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There is a way that DOES NOT USE describeType or creates a new operator?
recently, I research for the collection framework, and find LinkedSet(AS3Commons collection framework,it is a good opensource framework) written in ActionScript, but it can't use as dataProvider in ComboBox or DataGrid, because only implements ICollectionView can use as dataProvider. So I want to try if a class implements ICollectionView can work or not. I know Flex has build-in class implements ICollectionView, but I only want to define a class not use build-in class. The class as simple as possible.(can work is enough)
We've been developing an affiliate system and would like to detect somehow that a compiled, SWF advert implements clickTAG or not. Is there any way to automate this process?
I'm interested in making an object that implements IEventDispatcher.
Does anyone know what the goes in addEventListener(...) dispatchEvent(...) etc. ?
My goal is to create my own simple Button that listens to mouse events, not 100% sure about the entire process (probably use hitTest and a single invisible pixel to trigger mouse events), this object extends BitmapData (Not an IEventDispatcher) so i have the option to use pure pixel rendering + mouse control.
i have an xml which contains 'interface' sub tag, iam converting xml to object using SampleXmlDecoder. compiler did not allow me to access the value of the 'inteface' attrible of the resultobject.
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its treating interface as keyword. the solution for this.
It seems that Flex 4.5 can not compile my old AIR applications that implement the IDisposable interface. And how should memory management be done from now on?
I am building a tabbed interface for switching between various similar layers. Each layer will have a number of graphs. By dragging with the mouse the graphs can be rearranged or even moved between layers. My question is, is it best practice to register a unique mediator for each layer that keeps track of the layers content / organization, or should i keep track of it all with one central mediator.some considerations:
the layer contents and organization will be saved(in a db) so that it can be restored when a user comes back to the app.the layers themselves are functionally identical.the user can add and remove layers at will.
I'm developing an application that will randomize a list of words, and display them to the user. The user will then be able to drag the box containing each word over a Cartesian plane, and drop it anywhere they like. They will also be able to link various words together on the same plane. Once a user has completed these tasks, I want to update a database with that user's data - the coordinates of each word, as well as any parent words that may exist for each word. I started developing the application in Flex, but I'm running into problems integrating the data manipulation. It might just be me, but I find the way Flex is structured to be very counter-intuitive. I'm playing around with shifting the project over to perhaps a JQuery build. I'm proficient in neither JQuery nor Flex, however, and I'm not sure which one will be easier to pick up and develop a working prototype with.
For a Flex application that is used to search and display results (no write operations), I am currently storing data in a relational database, but rather than querying the DB via the app, I am doing a nightly write of the data, including its relationships, to an XML file.Then, through Flex, I am loading that XML file, parsing it into custom Objects, and "querying" those objects as necessary.
It works well basically filtering an ArrayCollection of these Objects based on search criteria. Versus querying the DB, full text search, for instance, is extremely fast in this scenario.But what are some potential drawbacks? How valid is this approach?
I have a base class which is being created via remote_object [RemoteClass alias] from the server.I have other specialized classes that are derived from this baseclass, but serialization with the server always happens with the base class.The base class has meta data that defines what the derived class is, for example
[RemoteClass (alias="com.myco...')] public Class Base {
I am looking for some decent tutorial that will explain the correlation between flash and flex (how can I use flex's coding ability with flash's design interface).
What does a web designer need to migrate to Flex quickly? A: tell me how I can get good fast B: tell me why it would be unrealistic to learn Flex quickly I want here both sides of it.
TELL ME WHAT I NEED - Projects I need to complete in Flex - Tutorials - Key concepts - Other technologies in a nutshell (webservices, SOAP, AJAX, HTML5 etc.)
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This Flex reference should include everything needed for beginning Adobe Flash Builder 4
Well, there is a huge debate going on with the "best way to show users language selection", but no answer.All seem to suck. 2 and 3 suffering from "Country != Language", 1 and 4 suffering from "Cognitively, selecting a word out of a list of words sucks."While this question may seem subjective, it is possible to answer this question in a non-subjective way.Such as if Flex or some Flex component exists as a "Language Chooser" such as that found on a mobile device.
I want to show the user a confirmation box when they deselect a checkbox. My code works although I think it is a bit of a hack. I listen to the checkbox click and then show the alert. Depending on the result I then set the checkbox to be checked again.
the code is specific to cb1 and cannot be reused for other checkboxes the checkbox is deselected when the alert shows. Then when the user clicks no the checkbox is selected again. stop the uncheck event if the user clicks no on the alert box. Is it possible to intercept this in Flex?
Does creating a new instance of an Object that uses an identical name to an older instance, delete the previous instance? Or should the original instance be deleted first? The code uses a ridiculous amount of XML vars. Isn't it less memory intensive to parse the XML and save the properties to an Object, and then delete the XML Object, rather than keep the XML Object around and reference it's child nodes directly? Is it better form to break up a huge XML file (>600lines/3200vars) into smaller chunks?
