Actionscript 3 :: Determine Whether Superclass Implements A Particular Interface?
Apr 8, 2010
Is there any non-hacky way to determine wether a class' superclass implements a particular interface?
For example, assume I've got:
class A extends EventDispatcher implements StuffHolder {
protected function get myStuff():Stuff { ... };
public function getStuff():Array {
[Code].....
How could I perform that super is StuffHolder test in a way that, well, works? In this case, it always returns true.
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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.
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Jan 18, 2011
How can I test if a class reference implements an interface? Note that the is and instanceof operators do not work with Class references.
Example:
public function set someClassref(value:Class):void
{
if(value is IMyInterface)[code]........
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Apr 29, 2011
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();
Note - this would be done in actionscript.
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Sep 7, 2011
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);
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Jul 13, 2011
In Actionscript 3, if I'm given a Class object, is there any way to determine if that class extends from another given class? I don't want to instantiate the class to check it with the is keyword, though.
[Code]...
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Feb 17, 2011
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();
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Mar 13, 2011
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.
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Mar 25, 2010
With this code
function someFunction(classParam:Class):Boolean
{
// how to know if classParam implements some interface?
}
i.e. Comparing classParam with IEventDispatcher interface
[Code]...
There is a way that DOES NOT USE describeType or creates a new operator?
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Jan 17, 2011
I'm trying to override a subclass's method but I think I need access to the superclass one higher up in the hierarchy. So I'd like to do something like super.super.methodName();
FYI, the actual problem I'm trying to solve should be explained by my code below:
public class A extends UIComponent{
override protected function keyDownHandler(event:KeyboardEvent):void{
super.keyDownHandler(event);
[Code]....
If I use the class A's KeyDownHandler method, you will see that remove() is called regardless. However, the docs state that I need to call UIComponent.keyDownHandler whenever I subclass UIComponent. Of course this works for the first subclass, but not that subclass's subclasses.
I realise that I could put the functionality all into A with something like if(this is B){...} but that seems to me to be a hack.
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Apr 20, 2011
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?
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Feb 2, 2010
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.
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Dec 25, 2009
i seem to have trouble finding on the internet what happends when one interface extends another interface.
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Feb 4, 2011
I am working on a project that is utilizing Flash Professional and Flash Builder. The art team creates assets in Flash Pro and publishes the project as a SWC. I then copy the SWC into my Flash Builder project's lib directory and access the assets through that. The art team is creating a lot of the same type of thing; let's say they're making lots of lizard symbols/components. All of these lizards have similar animations (walk_left, walk_right, etc.) and because of this they all have constants defined in ActionScript (WALK_RIGHT_START, WALK_RIGHT_END, etc.) relating to the keyframes in their animations.
From the Flex side of things, whichever Lizard I load, I want to be able to tell it to walk left. So I created a superclass in Flash Professional and now all of the AS classes for the lizards in Flash Professional extend this class - Lizard.as This is all fine and good, but when I want to add more complexities to my lizards, I don't want to have to open up the Flash Pro project, edit the class, recompile the SWC, send it back to Flex, and then test it out. I want to be able to have my Lizard superclass available for editing in Flex - so I made another superclass in Flex: Lizard.mxml
In Flex, each lizard component (like Gecko.mxml) currently extends Lizard.mxml, and each contains an AS component defined in the SWC (Gecko.as in this case). This seems pretty convoluted: An mxml component extending an mxml superclass, containing an AS component which extends an AS superclass. What I'd like to do is define one superclass in the Flex project, have my Flash Pro defined components extend this class (which is the part I believe to impossible), and then have my Flex Components (Gecko.mxml) extend those.
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May 8, 2007
1: Is there a way to set superclass variables from within a subclass? I can't seem to accomplish it.
2: Also, why does it seem when I call a function, the superclass version is called instead of the sub? I construct the class using the sub, so whats the matter?
3: In one of the classes, I want to push a MovieClip it creates into an array, it works, but I get an undefined, then the value.
4: I have 3 levels of inheritance in my classes Specials -> Human -> Player, who do i call each one correctly from one another?
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Oct 6, 2010
I have a Hero class that extends a Unit class that extends a SelectableObject class.[code]I have a movieclip in the library that links to the Hero. Inside the movieclip is another movieclip with the instance name "selector".In the Hero I can use selector.gotoAndStop (n) because the movieclip is linked to that class, but I can't do that for the SelectableObject because it's not linked to that.Is there a way to make selector.gotoAndStop (n) work for the SelectableObject? I can't even do var something:* = this.selector because the movieclip isn't linked to it.Or should I just remove the instance name for the selector in the movieclip so I can declare var selector:* = this.getChildAt (1) in the SelectableObject (the selector being the second child)?
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Aug 15, 2010
What I would like to do is to call a method from a superclass in a subclass. Specifically I want to be able to add the subclass as a child of the superclass but without physically having to type addChild in the superclass (but I will have to type it in the subclass). For now I'm just trying to call a method in the superclass that draws some text from a subclass.
Here is the MAIN class (the superclass)
package
{
import flash.display.*;
import flash.events.*;
[Code].....
The code doesn't compile, I get "Call to a possibly undefined method DRAWTEXT through a reference with a static type class".
I realize there are otherways to display text on the screen. I just need to learn how to call superclass methods.
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Aug 18, 2010
This is basically the opposite of what I was trying to do earlier. I just need to know how to change a subclass variable from it's superclass. So if I were to make an object in a class how would I dynamically change a variable in that object from the original class that I made it in?
Suppose this is the main function of my main class:
public function MAIN()
{
new OBJECT_square().CREATE(this,100,100);
OBJECT_square.X = 40;
}
Changing the X value in this way is not working. I realize I can set/change the X value when I make a new subclass but I need to be able to change it as I go. I also realize I can change it from within the subclass but this isn't what I want.
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Jan 3, 2011
For some time now I have been making a very easy game for iPhone in flash using as3. Recently I came in contact with a small problem, which is why I am posting this!
The problem: I have a superclass from which everything derives. In the superclass I initiate and place an Object on stage.
1. var myObject:typeA = new typeA();
2. stage.addChild(myObject);
As you can see this object follows the class 'typeA' which, ocf, has its own actionscript file. Inside of this file I have declared a global variable of type string.
What I want to do is change the varbiable on the new object from the superclass. Therefor I tried as following:
1. myObject.myVariable = 'someSortOfString';
Unfortunatly it didn't work and so I wonder how to do this; change a subclass' variable from the superclass.
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Feb 25, 2011
I have an abstract superclass which has around 300 subclasses. I would like to log when certain methods on this parent are called, and I'd like to know the name of the subclass thats making the call. Is there any way to do this without rewriting all my subclasses to explicitly pass their names upwards to the parent's logging method? E.g., let's say I have a superclass Foo with a method writeLog(str). Foo has a subclass called FooBar, which calls super.writeLog("hello"). Can writelog just inherently figure out that a FooBar called it, without the need to rewrite everything so that we have to call super.writeLog("hello", "FooBar") ???
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May 20, 2011
I have a class which takes a Vector.<DisplayObject> in it's constructor. I had expected it to be ok to create instances of this class by passing Vectors of types that are subclasses to the DisplayObject class (in this case Sprite ans SimpleButton). But it doesn't work. And casting these Vectors as Vector.<DisplayObject> when declaring the instances doesn't work either. [code]...
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Jun 12, 2005
So, how would you create a class that can access a variable in the class where the subClass was created(superclass), I realise this might be unclear so in example
PHP Code:
package {import flash.display.MovieClip;public class Main extends MovieClip {public va demoString:Strin = "TEST";public static var newClass:SubClass;public function
[code].....
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Feb 26, 2009
just made my jump into OOP and I am quite excited to find out such marvelous things that I did not know. If someone has a quick answer or can point me in some direction please reply to this question: How can I, if at all possible, modify a function from a superclass but preserving all of it's functionality? I know about the "override public function" but that is not precisely what I want.
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May 25, 2009
I'm not sure if this is a bug, or an expected behavior, but, if you try to call super["dynamicProperty"], given that superclass is dynamic, it will throw error telling you that the dynamic class <name of dynamic class> has no property "dynamicProperty". BTW, the extending class is dynamic too.
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Feb 15, 2012
Sorry to bother you with this thread, because I'm sure it's pretty obvious, but I can't see through it.
With this following code, I can't access the visible property of the Sprite class...
[Code]....
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Feb 24, 2012
So, how would you create a class that can access a variable in the class where the subClass was created(superclass), I realise this might be unclear so in example
[Code]...
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May 3, 2010
What passes to a subclass extending from a main or superclass, be it document or extending from a general MovieClip class etc? Does it pass absolutely everything from the superclass? That is to say, instance functions, variables defined inside these functions etc? Or just constructor variables? What passes through and does 'static' affect the transference of these values?
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Sep 3, 2011
I've run into an extremely odd problem. I'll give a code example to start. This is the superclass Building.
Code:
public var allowsEnemyMovement:Boolean = true;
public var information:String = "";
public var buildingName:String ="";
[Code]...
Now here's the odd part. Only SOME of the variables defined in the superclass do this. the variable information, buildingName and health all will take the default value from the super class. But the variable defenseValue will take its value from Factory's constructor. What am I doing wrong here? I would like to keep default values in the superclass so that I don't end up with null pointer errors later just in case.
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Jul 27, 2009
I'm trying to set up a large project that has a "shell" application that preloads and eventually displays a bunch of SWFs as a "slideshow". Each SWF could be authored by different people but will reference a base document class so they exhibit consistent behaviour. One of these behaviours is to be able to localise the slideshow into different languages. Since each SWF could have a different number of textfields that need to be localised embedded into their main timeline, the SWFs each must declare their stage instances in their document class. In order to implement the common functionality (such as a "localiseText()" method), I have decided to package all common functionality into a superclass (what I'm calling "Base Class" in this example) and using a subclass as each slide's document class.
This Example:This is a simple example I set up because in my actual project my compiler was throwing a coercion error when I tried to cast the Loader.content as my external class. The structure of this example is the following:
+ loader.fla : this is the main "shell" application.
+ SWFLoader.as : the Document Class for loader.fla
+ external_1.fla : this is the external SWF file that will get loaded and displayed
[code]....
I've set it up this way because a hypothetical external_2.fla might have different public variables to declare its stage instances so would need a separate implementation of ExternalBase (presumably External2.as).
The code (in reverse):
base/ExternalBase
[code]....
This just sets up the localiseText() method which is used in this example to change the contents of the text field. Since we don't know the name of the text field in the particular slide's timeline, we have to ask for it from the subclass' implementation of getLocalisableTextField(). We declare an abstract function here that needs to be overridden in the implementation.
[code]....
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Nov 26, 2008
It's early days in my AS3 learning, and I'm looking for a little clarification regarding a variable typed to a superclass (in this case var mySpinner:MovieClip) which contains a reference to an new instance of a subclass (in this case Spinner.) I am trying to get my head around why my code compiles and runs and I am able to call the method rotater() on mySpinner even though mySpinner is typed as MovieClip, and the MovieClip class does not contain the method rotater().
On page 163 of the official Adobe Programming ActionScript 3.0 documentation it says the following, which I believe is related to my situation, but I am still in need of clarification:
"Because each class defines a data type, the use of inheritance creates a special relationship between a base class and a class that extends it. A subclass is guaranteed to possess all the properties of its base class, which means that an instance of a subclass can always be substituted for an instance of the base class."
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