Actionscript :: Static Versus Instance Methods
Dec 23, 2009
I'm working on a video player and I initially developed the player with everything in the .FLA file with no classes. Then I started modularizing my player into classes and realised that my classes are static methods rather than instance methods which doesn't seem to be needed in my player. My question is - is this a bad design to have all of your classes methods to be static rather than instance methods ? As I dont see the need (yet) so that's why i geared more towards static methods, is this a bad design?
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May 4, 2009
I'm kind off oblivious as to what I'm doing wrong here... I have two classes: - Alley - AlleyCat
[Code]...
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Jan 2, 2010
changed one of my methods to static and it worked for what I was trying to do but I would like to know what is the difference between static and instance method.
What is the difference between static and instance methods?
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Nov 17, 2010
This has been a long-standing curiosity of mine, and I haven't gotten around to profiling to find out, and haven't seen it asked yet (for AS3):Let's say that I have a class:
class MyClass {
public function myMethod():String {
return "some return value";
[code]....
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Dec 28, 2009
If I created a static method. say I decide to call on other methods within that static method. Do those methods I call on need to be static as well? what If I used some of the properties. Not to store data permanently, but just within that process. Do those properties need to be static ??
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Feb 21, 2007
Yesterday I found myself wondering, what is the difference between either having a class with methods that are all static, or simply giving your class the static attribute?
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Jul 27, 2009
Which is a much better practice in binding a value in Flex?
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Aug 7, 2007
Anyone ever notice that Flash renders the same font totally differently depending on whether its a static or a dynamic textfield? It's really frustrating when you're trying to make everything look consistent, and it looks like you are using two different weights of the same font.
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May 29, 2009
pros and cons of either using a Singleton that enforces only one instantiation of itself, versus creating one common class with static vars which can be accessed by all other classes that import it?
In my testing, importing but never instantiating works fine. I can even change the value of one of the variables and then have another class see that changed value later on in the program.
If I *know* I will never actually create an instance of my Global class using the New command (but will instead just reference the variables using the class's name), then why should I need to make it a strict Singleton?
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Jan 6, 2011
i got an error in AS.1042: The this keyword can not be used in static methods. It can only be used in instance methods, function closures, and global code.this is the error line.public static var defaultEase:Function = this.easeOut;
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Apr 1, 2009
I have tried declaring an interface with static methods, but I'm getting an error:
PHP Code: 1157: Interface members cannot be declared public, private, protected, or internal.
I have about 3 different classes I'd like to implement this interface and there are only two static methods that I want to define. If I remove the public and static keywords in my interface, they must also be removed from the classes or it complains about that:
PHP Code:1044: Interface method serialize in namespace net.foo:MyInterface not implemented by class net.foo:MyClass.
So I guess I should just dispense with the interface?
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Mar 17, 2012
I am writing class that extends adobe air PNGEncoder,
I want to use the writeChunk method, but it seems to be private static and i cant seems to use it with my code But it gives the error as below
[Code].....
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Aug 14, 2007
when i'm coding directly on the timeline, i usually create a var like this:
Code:
var home:MovieClip = this;
so i always have something to reference the main timeline's scope. how could i do this in a class? delegate.create gets a little confusing.
i tried a few things like the following:
Code:
class com.myClass
{
public var className:String = "myClass";
public static var version:String = "0.0.1";
[code]...
of course this is redundant because it'll scope just fine as parseNews();, but i'm just wondering why it's letting me scope it like this here and not in the onLoad declaration?
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Feb 17, 2009
I have a question about classes. I just learn that static means that functions and/or properties are specifics to a class, but is it a synonym of private? And why statics (not available to any instances?) properties and/or methods can have a public (available anywhere else (timeline)) access modifier? PS: I just start with classes.
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Mar 14, 2011
1.Is there any way to access the private data members of a class in action script using asmock framework? I tried using syntax likeContentPlayermockContentPlayer;Where in getContentPlayer is a private member and mockContentPlayer is alias am creating, but its not working well, I doubt whether I can do like this?
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Jul 12, 2010
When I use a Mouse Event listener with the trace function trace (e.target.name), why don't I get the instance name I assigned in the property panel? Instead I get something like "instance 12". How can I target Mouse Events using the names I assgn?
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Jul 7, 2009
i have a main movie. i use a loader to load a "example.swf" file. then i place that file inside a holder movieclip. in example.swf, i have an instance of a class i just wrote. this class has some particular methods. from my main movie, i want to call the methods of the instance of my class i have in example.swf. how can i do that??? i know it's a kind of casting, but none seems to work.
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Apr 30, 2009
I have recently adopted an FLV from someone else. It is structured "unconventionally" at best. For this reason (and because I am not well-versed in AS3), I haven't been able to get a pause/play button to function properly. About the file, The project is a 6-7 minute demo for a new product complete with voiceover. You have to drill in 3 movie clips deep before you can get to much of the animation. There are gotoAndPlay functions at the end of each 3rd-level movie clip that refer to a frame on the 2nd level.
On the 2nd-level frame, there is a stop function which allows the next movie clip to play. Each movie clip contains a sound layer for voice over. About the play/pause button. The instance name is pauseBtn. The button code below is on the 1st frame of the main timeline. There is a keyframe on the second frame for another bit of code. The button itself is a 2-frame MC that spans the entire main timeline. The event.target.gotoAndStop() lines are working properly to change the look of the button.
My button scriptstop();
import flash.media.SoundMixer;
var pp:Boolean = true;
function ppState(event:MouseEvent) {
if(pp) {
stop();
[Code] .....
What happens when I test the movieThe animation plays without problem as long as the button is not clicked. I haven't been able to see a pattern in the chaos that occurs when the button is clicked.
Sometimes nothing happens.
Sometimes it stops the sound only.
Sometimes it resets to the beginning of the movie.
Sometimes it starts play random parts on top of what was already playing.
This error appears in the output pane.
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at NameOfTheFile_fla::MainTimeline/chk()
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Jan 15, 2009
Im new to AS3.[code]I have above code in a movieclip which i have Exported as a Class.But when i run it says "Constructor functions must be instance methods".
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Jun 14, 2009
I'm using flash and the error message "Constructor functions must be instance methods." appears for the following code:
invsibleBtn.addEventListener(MouseEvent.CLICK,onClick);
function onClick(event:MouseEvent):void { navigateToURL(new URLRequest [URL]New to action script coding.
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Jun 28, 2011
I'm new to AS3 and HaXe, but was hoping to find a way to use methods from a final class (Graphics) without always prefixing an instance variable.Instead of something like this:
var gr:Graphics = flash.Lib.current.graphics;
gr.clear();
gr.beginFill(0xffffff, 1);
gr.drawRect(0,0,400,400);
I was hoping to get something that works like processing.org, but I guess a lot of the convenience there comes from the preprocessing. I looked at the HaXe reference on advanced types (http://haxe.org/ref/type_advanced), but I haven't been able to make anything work so far. This probably isn't possible since Graphics is final, but I thought it wouldn't hurt to ask. It seems it would be easy if I could extend Graphics
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Jul 20, 2010
I am trying to link buttons in Flash to placeholders on the time line, but keep getting this error message, any ideas what it means
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Jun 24, 2010
I keep getting that error when i try to compile and the only script I have in it is this:
[Code]...
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Jul 18, 2010
I am follwoing a tutorial on linda.com about creating a website in Flash everything was going well until i started trying to copy the action script in the online examples now I keep getting this error message and can't figure out how to get rid of it:
[Code]...
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Jul 27, 2009
If all I have is an instance of an object, can I call a static method of its class? For fun, let's say I don't know what the name of the class is, only the name of the static method.
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Mar 25, 2011
I have a ManagerClass with a Singleton implementation inside, I get the instance by calling ManagerClass.getInstance().
Can I get that same instance by just having the class name as a string? I have tried something like:
var theInstance:* = getDefinitionByName("ManagerClass").getInstance as Class;
theInstance.doTrace(); // I get a 1009 error here
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Sep 21, 2011
My method has been passed a class instance, but it was typed through an interface so I'm not 100% sure what class it is. I'd like to attempt call a static method on that instance's Class.. is there an easy way to do this without being forced to pass the class along as well?
Something like this:
ActionScript Code:
public function foo(myBarInstance:IBar):void {
var barClassPointer:Class = getClass(myBarInstance);
try {
[Code].....
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May 3, 2010
What I'm looking for is a way to reference the document class instance, to be able to access functions and variables that other classes need. I'm currently doing it with this little piece of code I found on some blog or forum.
Code: Select all// This is in the document class
private static var _instance:DocClass; // I have tried setting this to public and accessing it directly as well
public static function get instance():DocClass { return _instance; }
[code]....
This seems to work as it should in Flash CS4, but when I try to run the same code in CS5 I get the following error message:
Code: Select allC:UsersImpenDocumentsMy DropboxFlash Project\_SPELTankGameMenuShop.as, Line 238 1195: Attempted access of inaccessible method globalFunction through a reference with static type DocClass.
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Nov 4, 2011
I need to know when an element is added to the stage (using main document class). So i use :
Code:
public override function addChild(__child:DisplayObject):DisplayObject{
super.addChild(__child);
trace("child added");
return __child;
}
Which works fine. I also use a static class, to which i pass the stage using :
Code:
public static function setStage(__stage:Stage):void{
_stage = __stage;
}
But if i add to the stage (_stage) a MovieClip from the static class, my "real" stage doesn't seem to get that something was added. So i guess _stage !== stage.
So why is this happening, why is _stage not getting the methods of stage ?
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Apr 29, 2010
I have a class ErrorMessages which holds all my error messages as static constants. So I could access them like ErrorMessages.PASSWORD_INVALID or ErrorMessage.PASSWORD_TOO_SHORT. I want to know if it is possible to have separate classes that hold subset of these constants and access them like ErrorMessages.PASSWORD.INVALID or ErrorMessages.PASSWORD.TOO_SHORT, etc. This way I can more structured static structure and makes it much easier to use autocomplete. I tried few different ways and couldn't figure out if this was possible..
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