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.
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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.
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);
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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.
i'm developing an application for both desktop and mobile devices and would like to use the same code base for each build.
i want to employ cacheAsBitmapMatrix on some of my display objects, but cacheAsBitmapMatrix throws an error if it's included in an AIR application with a device profile other than mobileDevice or extendedMobileDevice.
something like the following would be ideal:
if (cacheAsBitmapMatrix.isSupported)
myDisplayObject.cacheAsBitmapMatrix = new Matrix();
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I want to pass an optional data parameter to some callbacks, but only to callbacks that support a single parameter; right now, I have a moderately-sized code base of callbacks that cannot accept a parameter at all. How can I check what parameters a Function object supports?
View 3 RepliesI'm not really asking how. What I'm asking is, is it possible? And I ask because I thought it was not - certainly it didn't work in AS2 - and yet that's what I appear to have done. Am I going crazy? Structure: A SWF (#1) with a class NewActivity that extends class AActivity. Another SWF (#2) with a shared library of code in it, including AActivity. A third SWF (#3) which loads the library followed by SWF#1. Here's what happened: I didn't expect AActivity to be able to be shared. I mean, it should be compiled no matter what in SWF#1, as SWF#1 includes a class that extends AActivity. I had added some properties to the AActivity class, ran the project, and when SWF#3 tried to set those properties I was told they couldn't be applied. "Of course", I said, "I need to recompile SWF#1, because the code is now out of date. The version of the class there doesn't include these new properties.".
However, that didn't work. I got the same problem. Maybe, I thought, there's a definition conflict between SWF#1 and the library, so I removed the AActivity class from the shared library in SWF#2 for the time being. Only SWF#1 uses it, and it should already be compiled into SWF#1 as, like I said, it is extended by another class there. But when I ran the project, I was then told that the AActivity class could not be found at all! Looking at SWF#1 in a decompiler, there is in fact no mention of AActivity (I had up to this point assumed it was implied). So this left just one option: I needed to recompile the library in the first place, not SWF#1. I added AActivity back to the library, recompiled, and it worked.
To check I wasn't going crazy: I added a test property to the AActivity class and recompiled the library. The containing project - SWF#3 - then set this property on SWF#1, which had NOT been recompiled, and then read it back out. No errors. I should point out that the getting/setting of this property is done through an IActivity interface - AActivity is not being accidentally compiled into the main project (SWF#3), and the decompiler indicates this also. Am I going nuts? I really didn't think having a runtime shared super class was possible in any way. If it is, that opens up a whole new world of awesome, even though I've created this project on the basis of that being impossible.
i'd like to throw an argument error if a particular function doesn't work without a passed value that also happens to be a public constant of the class containing the function.is there anyway to determine if a class owns a public constant instead of having to iterate thru all of them? something like this:
public static const HALIFAX:String = "halifax";
public static const MONTREAL:String = "montreal";
public static const TORONTO:String = "toronto";[code]....
currently, for this functionality i have to write the city setter function like this:
public function set city(value:String):void
{
if (value != HALIFAX && value != MONTREAL && value != TORONTO)[code].....
since the MXMLC compiler doesn't support mixed access modifiers for setters/getters, i would like to know whether a public setter function is being called from inside or outside of the setter's class. this approach should allow me to maintain a public property but with more security, something like public/private hybrid access. is it possible to use arguments' callee property, or perhaps something else, to determine whether the setter was set internally from the setter's class or if it was set externally?
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I got something like this:
var myClass:myClass = new myClass;
addChild(myClass.showLabel);
Then, inside this class there's this code:
[code]......
I am working on a Flex Front End at the moment, and have been using the Parsley framework for passing messages/events around.
I was wondering if there is a simple way for a function (in this case, an event's constructor) to obtain a reference to the object which called it?
This is to ensure that a certain event that I am defining can only be dispatched by one specified class. My thinking is to check the caller of the constructor somehow, and throw an error if it is not of the correct type.
For this example, I will use 2 classes, Entity and CSpawner. CSpawner is a children of Entity.I want to perform the following condition:if((new CSpawner()) is Entity)It works just like intended.But I want to do this test, without creating a new CSpawner object, something like this:if(CSpawner is Entity)But it doesn't work, because CSpawner is a Class.How do I perform that kind of conditional without creating a new CSpawner object?
View 2 RepliesThis is probably a silly question buy how do I find out if an Actionscript Object is just an Object ,but NOT any subclass IE String bool etc?[code]...
View 1 RepliesI recently found a method (ByteArray.clear()) that FlexBuilder complains is possibly undefined; however, the method is in fact documented in the Flex LiveDocs. It must have been added in a later version of the SDK than I have installed. I'm not asking about this particular method, but I'm giving it as an example of the documentation issue that I'm trying to resolve. My questions are:
How can I determine what version of the SDK or Flash player that a method or property was added in? How can I tell which versions of the SDK are supported on which Flash player versions?
I want to be able to determine from the documentation, instead of compiler or runtime errors, what SDK and Flash player versions are needed to support newly added methods.
With Java I look for the @since javadoc tag when I need to know this, but I can't find an equivalent feature in the Flex docs.
How to get CSS class name of any UI Component at runtime?
View 1 RepliesI know how to set individual style names to a UI component but what is the way to set set the CSS class itself?
View 1 RepliesCode:
var myOnStageClip:MovieClip = this.fileInstanceMC;
var myLinkage:Class = Class(getDefinitionByName(getQualifiedClassName(myOnStageClip)));
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Is there a way to runtime-type a class with tokens, like the Vector class, or it is exclusive to FlashPlayer and Adobe Team?
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I have a MovieClip with multiple child MovieClips. I would like to add a class to each child MovieClip. Unfortunately, I can't just create the class and mc.addChild(class) because classes aren't display objects.
View 3 RepliesI'd like to be able to generate a class that inherits from BitmapData at runtime. Is this possible in Actionscript 3? If so, what is the syntax?
View 3 RepliesI have a class which takes in another class as one of its parameters, and creates instances of it according to certain rules.In the past, I've had no problem with passing classes from the library to that class, which obligingly does its magic.In this case, however, I'm dynamically loading an image at runtime. I'm trying to wrap that image in a MovieClip, and somehow pass that clip *as a class*, to the one that creates multiple instances.Is this possible? I thought I'd cracked it with something like:
Code:
theMovieClip.addChild(thePicture);
var apples:Class = Class(getDefinitionByName(getQualifiedClassName(theMovieClip)))
[code].....
I would like to choose between two classes that initiate a load of 3d stuff.
along the lines of:
Code:
if (LOW_QUAL)
{ var galaxy:Galaxy_LoQual = new Galaxy_LoQual (gal, light ) }
else
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Is there a way in AS 3 to trace what embedded fonts are available to your class at runtime.
View 1 RepliesI'd like to set the base class of a library asset at runtime,rather than specifying it before. Is this possible? I'd like it to just extend movieClip, but at runtime change that to extend a custom class.
View 1 Repliesi have a class and trace its type with flash.utils.describeType(this)
class Data extends EventDispatcher
{
public function Data()
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Is it possible to override this information e.g type.@isDynamic, as well as extendsClass.@type, at runtime? without bytecode?
Can someone point me in the right direction on how to instantiate any class at runtime with any given number of arguments?
As an example and to be more precise, I included an example below. How could I write this example in one line of code - ok, maybe two : )
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How would I create a strongly typed class at runtime (so to be able to create instances of it)? It can't be a proxy.
Additional Info: For example, say I want to create a Person class with first and last where both are Strings.
Context This is for an application that lets you create the data model and custom components at runtime. This is only part of it. I need to be able to have strong typing. If that means going to the server and creating a new SWF on the server with the value objects then loading in the definition at runtime then I would but that is a lot more work if there is an alternative.
I'm trying to place an instance of a movieclip (instance name: tehMovieClip) from the library within another movieclip (instance name: parentMovieClip) on the stage. tehMovieClip, the movieclip going inside another movieclip, belongs to a class called CollisonDetection (linkage properties, class:CollisonDetection, Base Class: flash.display.MovieClip). When I put tehMovieClip inside parentMovieClip, I get this runtime error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
If I just place tehMovieClip on the stage by itself, it works fine but I need it to be inside parentMovieClip.
I have a blank FLA. with document class index. I have an AS file name index saved in same folder. My custom package looks like this, but the movieClip does not display at runtime. I'm just trying to begin work with OOP and custom classes and I'm not sure why this isn't working for me:
package {
import flash.display.MovieClip;
public class index extends MovieClip {
public function Main () {
var D:MovieClip = new dMC();
D.x = D.y = 100;
addChild(D);
}}}
We are using GraniteDS autogenerated AS code to map Java remote objects to AS.
We have objects that contain List sites in Java so when they are converted to AS it looks like:
JAVA: private List<MyObject> territories;
Actionscript: private var _territories:ListCollectionView;
The trouble is we are using MXML databinding to bind the contents of that list generically, the trouble is we never reference the type of object contained in the list explicitly so it's never compiled into our SWF is there any way to ensure that objects in a list for a RemoteClass is compiled in?
Using org.as3commons.reflect I can look-up the class name, and instantiate a class at runtime.I also have (non-working) code which invokes a method. However, I really want to set a property value. I'm not sure if properties are realized as methods internally in Flex.I have a Metadata class which stores 3 pieces of information: name, value, and type (all are strings).I want to be able to loop through an Array of Metadata objects and set the corresponding properties on the instantiated class.[code]I realize that I have to declare a dummy variable of the type I was to instantiate, or use the -inculde compiler directive. An unfortunate drawback of Flex.Also, right now there's code to account for typecasting the value to it's specified type.
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