ActionScript 3.0 :: Global Variables: Singleton Versus Static Vars?
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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Jun 11, 2011
WHY would I use this pattern to hold variables accessible to other swfs throughout the project when I can just keep them in the container movie and access them as desired.Is there any advantage like optimization, security, ease of use etc..how I access a varibale in a parent mc unless answered here too as it is in the same category.Is it best to access a varibale in the parent using
1. MovieClip(parent.parent).variableTargeted OR import com.parentAsDocument; And then access the variable
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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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Nov 3, 2010
How can I access a timeline variable from a static class / singleton?
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Jan 1, 2010
I am not able to understand, why a static class cannot replace a Singleton design pattern .
Cannot a static class, can be used to ensure, the class is never/once only, instantiated. Because that is the facility "static" key words provide , however it doesnot allow instantiation, but that is much similar to the limitation of instantiation once only.
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Jun 22, 2009
I'm building an object oriented project with liquid layout in a loose MVC framework. My controller knows when the stage is resized, and it needs a way to tell all of the display objects to rearrange themselves appropriately when the stage resizes.
Option 1 would be extending the sprite class with a class that has one additional resize() function. On initializing the class it would register itself with the controller which would then noitfy all of the assets when it detects a stage resize.
Option 2 would be building some sort of global event that any child of the stage could listen for and do its thing when the event comes through.
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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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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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Apr 28, 2004
Is it possible to make global functions, much in the same way you make a global variable, reachable from anywhere in the project?
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Nov 13, 2003
I have this code in a movie, the movie loads fine on it's own but when i load it into another movie it does not work. I think this is to do with global vars, but im not sure. look at the code to see if it is the case. how and where i would change the vars so they are global vars.
[Code]....
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Aug 3, 2004
I have a load vars function that looks for a txt file and grabs data from it, right now they have to be in the same dir. I'd like to have the txt in the root of my server and then be able to link from any dir in the site. I have:
("dataValues.txt")
What should I add before it, I thought maybe a full URL, but no, is it something like ("../dataValues.txt"), basically I want to make the link global for the site - I don't have access to the files right now.
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Oct 27, 2010
I'm trying to call a function in my main class's .as file from a sub-one.However, the function (in the main class called "makeTurret") needs to add it as a child to the main class. However, to access it from the sub-function it needs to be a static public function (to my knowledge).Because of this, I can't use this for the root.UNWORKING code (Specifically the makeTurret function at the bottom):
Code:
package
{
import flash.display.MovieClip;
import flash.display.Shape;[code].....
I used a "GlobalVarContainer" thing as suggested in this blog post: greenethumb.com/article/11/global-variables-in-as3 which seems pretty handy and I'll definitely use it for other things such as level number and health and so on. However, I still can't use the .this function, so I'm unsure how to actually assign anything to the MovieClip stage, so that things can be added to it as children.
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Oct 28, 2009
I need to create a global var in AS3 so that I can create the var on the main timeline and change it within another movie clip.
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Feb 5, 2010
I am trying to set the value of some static vars but I need to reference the class with a string rather than a proper constructor. In AS3 I can do this with:
var ref:Class = getDefinitionByName(classDefinitionAsString) as Class;
ref[varNameAsString] = newValue;
I can't find an equivelant approach that will work in AS2 though. I have tried:
var ref:Object = new [classDefinitionAsString];
ref[varNameAsString] = newValue;
This seems to just create an Object and as the vars that I am trying to access are static I don't really want to be using 'new' I just want to reference the vars.
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Feb 6, 2010
it doesn't seem like you can use locally scoped vars within a static block?For example I was thinking I could do:
Code:
public static var standardAgeRange:ArrayCollection = new ArrayCollection();
//static block
{
[code]....
but apparently I have to first declare _n as a static var of my class (or as a static var within the block itself) in order to use it within the static block.needed to do...
private static var _n:int = 2;
then in the static block:
for (_n=2; _n<120; _n++)
In Java I'm able to use locally scoped variables within the static block. I know this isn't Java, just wondering if I'm missing something fundamental. (I couldn't find a lot of documentation online concerning static blocks in AS.)
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Jan 27, 2010
If I only instantiate a class once should I make its vars static? I understand how this is of benefit if I make multiple classes, clearly you use less memory as it creates a reference to the same place for each class. Are there any other benefits for creating static vars or functions ?
For example I have my class 'MainMenu' which I create once (might even be my document class). In it I create a
Code:
private var someHolderForStuff:Sprite = new Sprite();
Should I rather create
Code:
private static var someHolderForStuff:Sprite = new Sprite();
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Sep 27, 2011
I'm creating a utility function for debugging/logs, which I access by importing the class and calling
new Log(params);
Alternatively I change the function to a static, and rename it to It,
then I can call it by Log.It(params)
I'm wondering if it possible to set it up so I can simply call Log(params) similar to the trace command?
function:
package
{
public class Log
{
[Code]......
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Sep 20, 2010
I have been using the flashvars from swfobject for a long time to pass info into my swf for specific outcomes. I am just starting to publish everything using flash player 10 and wasnt able to get my variable to be seen by the swf. maybe i was doing something incorrectly with this new file? but i then took code from my older files and they didnt work either... then i published down to flashplayer 9 and it worked perfectly... ???
i am using swfobject 2.2 and my code for passing the flashvar is
// Flash Code:
Code:
var r:int = root.loaderInfo.parameters.varName == null ? 0 : root.loaderInfo.parameters.varName;
[code]....
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Mar 3, 2009
i want to create a global function in actionscript 3.0 i can do this in flash as2 As3 remove that _global. if i want to create a _global function then want to create a static metod in another class file...?
[Code]....
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Dec 4, 2009
I would like to pass over 50 items of variables from php to flash. Actually I want to pass array with foreach statement, looping through the array and assigning loop index to the variables and flash again accept the php values through looping. Is this possible? If passing values through foreach or loop statement is impossible, I would like to break a new line in tag. how can I break a new line in FlashVars tag?
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Dec 5, 2008
I realize that the issue of global variables has been discussed several times on this forum in the past. I have carefully read each one but I could not find any clear, definitive answers. Let me first give the basic idea of what I plan to do with Flash.
I will be simulating electrical, pneumatic, etc diagrams. I will, for an example, have a circuit breaker that can be clicked, thus changing its state from open to closed. Once this is changed, the flow from that circuit breaker will also be changed. This could all be accomplished inside of this file fairly easily, but this Flash file will be linked to hundreds of other flash files, each containing a unique drawing, but the variable for that circuit breaker, and all the other conditions need to be passed from drawing to drawing.
I have spent a lot of time researching online and browsing this forum, but I cannot find a solution to this problem.
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Aug 5, 2009
I am using flash vars to pass variables into my swf file.but i want to refetence a Mc by using a flash var. [code]how Can i call a Mc from the flash vars and have it do something
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Apr 18, 2011
I'm loading variables from php using loadVars in a function that is called when a button is pressed.
ActionScript Code:
getArrangement = function(){
theArrangement = new LoadVars();
theArrangement.onLoad = function(){
[Code]....
how do i get my variable to always be the same as the onLoad value and/or the one in my dynamic text box?
I need to feed the correct result back into my database.
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Sep 4, 2008
In as2, we had global variables which were accessible from anywhere within the movie. How can i achieve similar functionality in as3? You see, in my site, after a user logs in, there are several pages, and each of them calls a php script, and i need to pass the user id as a parameter to them! So as soon as the user logs in, I need to store his id in some place, which i can read from any class or subclass within the whole movie! Can you please tell me how to do this? oh and yea, i am new to as3, so please try to be as descriptive as possible!
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Jul 2, 2009
Problem: global variables disappear.I am using CS4 but still coding in AS2. I am on a Mac, latest OS.I loaded and then trace my _global variables for three screens and they follow me fine until,.... then on the the screen i have tiny bit of code:[code]Could it be the level 99 I use. I tried using 0 and it did not work?
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Mar 18, 2009
are all variables written as global variables in Flash CS3? Is there a way for some variables just to work for some frames?
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Aug 29, 2011
Where do I place a function, at the lowest level, so I can call it from any other container above it? For example, I have 3 frames and they all need to use the same function, called "myFunction()". Do I really have to create it in each frame? There has so be a lowe level where this can be placed? Is there a good simple description of AS3 Hierarchy somewhere? Also, how do you specify global variables in AS3?
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Apr 14, 2008
I'm trying to create an object/variable in my .fla file which will be accessible to functions located in my .as files. How do I do this?
Example:
Code:
// code in timeline of sample.fla
var player = new myObject();
[code]...
Normally, I would get an error from the second code block, saying that it doesn't know what "player" is. So how is this done correctly?
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Aug 19, 2009
I've done a search and all I could find are creating global variables through Classes.
Is there a way of creating them on the timeline? I have a preloader.swf that loads another swf to itself and would like to read the values off of the parent.
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Oct 21, 2004
I'm trying to create a global variable that initially stores a 0.Then via a function will change the value of that global variable, and allow the other functions to access the new number. I have it working where it adds 1 to the variable, and stores the number 1 however, I cannot get the number to add up beyond 1.I have this in my first layer,frame.
_global.thisSound = 0;
function PlaySound(){
temp = _global.thisSound;
[code].....
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