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.
a little foggy on passing variables to the Constructor from a Singleton instance. Could someone enlighten?
From timeline:
Code:
var c:Calculator = Calculator.getInstance(5,20,30);
[Code]...
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
How can I access a timeline variable from a static class / singleton?
View 14 Repliesi'm trying to search a string for a particular pattern, and replace it with elements from within the pattern... for example..here's the given string...if you want to learn how to use regexp, {url===http://somesite.com, text===click here}.
the pattern...
{url===http://somesite.com, text===replacement text}
and the intended result...
if you want to learn how to use regexp, click here.
of course, i'll extract the url and do something else with it... i'm just wondering what the regexp is for that pattern, and how i can extract things from the results returned.
I can't understand why should I even use the Singleton pattern in ActionScript 3. Can anyone explain me this? Maybe I just don't understand the purpose of it. I mean how it differs from other patterns? How it works? I checked the PureMVC source and it's full of Singletons. Why are they using them in the View, Module, Controller?
View 2 Repliespackage public class Singleton private static var _instance:Singleton=null;
[Code]...
I'm trying to call AMFPHP two times on a single ActionScript method and what happen is that only the first call succeed. The second one doesn't return an error, doesn't alertsanything, it is more likely that it doesn't even happens and I'm not sure why.Here is an example:
public function editSomething():void{
if(dgChild.selectedIndex == -1){
Alert.show("You need to select a register in order to edit it.");
[code].....
I'm looking to get some good books on design patterns and I'm wondering what particular pattern you'd recommend for a Realtime Strategy Game (like Starcraft), MVC?. I'd like to make a basic RTS in Flash at some point and I want to start studying the best pattern for this.
View 3 RepliesJust curious. TweenLite/TweenMax is a very common animation library, and I was wondering how someone would classify the design pattern used in TweenLite.For those of you unfamiliar, here's some example code from their website:[code]
View 1 RepliesCan anyone show an example of the object pool design pattern, as written with Actionscript 3.0?
View 1 RepliesI am just looking design patterns used in Flex. Any value object design pattern and how is it implemented in Flex.
View 3 RepliesI haven't found the best process is integrating SWFAddress. I've used it on just about every project since it came out, but I rarely have something reusable, and integrating SWFAddress is one of the more time/thought intensive tasks in the dev of a project.
View 5 RepliesI'm just beginning to wrap my head around design patterns. I'm in the process of rebuilding a slideshow using MVC and it's coming along nicely. I'm considering using a design pattern for the whole site and am wondering if there are certain patterns that people usually apply to sites.
View 4 RepliesI'm updating a photo gallery site I did a while back to be full browser and with classesI produced this demo to work out the full browser elementsI did this with a Document Class and everything seems to be working as expected.For the updated version of the site I'm using a Model View Controller design pattern and I'm trying in implement the full browser in the View ClassTypeError: Error #1009 : Cannot access a property or method of a null object reference.I would have excepted more form this forum but I can't post any code here or even paste the text - very poor.
View 1 RepliesI have an application that takes the user through a set of steps, configuring a product, say about 10+ screens. With options to go back, skip to a certain point etc. I need to fade between these steps, and also have language switches available at any point.
I was thinking of using an MVC style pattern, having a master view that accepts a 'next view' and fades it in, removing the old.
It feels bloated to have 10+ separate view classes, using similar components for this task, so was wondering what other approaches there are that I should look into? or one that is suited for this kind of application
I'm still studying OOP designs, so what's the best way to achieve an inventory for a simple flash game? It seems that more than one design pattern could deliver some kind of an inventory but I would lose the flexibility if I try to adapt it somehow without a good knowledge about the subject. For money to buy what is available in an inventory I thought of Singleton. If there's enough cash earned while playing the game, then one can buy new skills. Maybe decorator pattern could list many thumbnails as buttons, and clicking on it applies new features and skills to the character.
View 1 Repliespros 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?
In this cookbook someone advocates to build own Observer Design Pattern: [URL]
Is it really faster as for performance ?
There are many times that I've needed to execute some code after a number of events have fired, and I've come up with counters and such but I feel there must be a better way.For example, say five files need to be loaded, after which a UI component will become active.If I set up a counter that increments each time a file is requested, then decrements each time one has loaded, I run the risk that the first two or three files may somehow get completely loaded before my code gets around to requesting the fourth and fifth, which would mean that my counter would be at zero when I still have two files to load, thus allowing the UI component to be prematurely activated.
There are some cases where you could know the number that need to be loaded before the requests go out, but it's possible that the first file contains the paths (and therefore the number of) files.And this file-loading scenario is only an example of the pattern I'm trying to explain.)
I'm working with an application which was originally designed to make heavy use of static-variables and functions to impose singleton-style access to objects. I've been utilizing Parsley to break apart some of the coupling in this project, and I'd like to start chiseling away at the use of static functions. I will explain the basic architecture first, and then I'll ask my questions. Within this application exists a static utility which sends/receives HTTP requests. When a component wishes to request data via HTTP, it invokes a static function in this class: Utility.fetchUrl(url, parameters, successHandler, errorHandler); This function calls another static function in a tracking component which monitors how long requests take, how many are sent, etc. The invocation looks very similar in the utility class:
[Code]...
I was looking to hir someone or make this myself but i could really find any tutorials or anything. Does anyone know how i can make an effect like this in Flash:can you make one like it for my website CreationCrave?
View 1 RepliesI have a Main class loading 2 SWF (loader and viewer, also with document classes). They need to share a double buffer with content, of course, filled by loader and showed by viewer I was thinking to use the LocalConnection class but after a suggestion from PatrickS now I'm evaluating the possibility of a Singleton Class. I've never used this pattern in AS and must confess I'm rather biased against it.
But in this particular case I guess it'll be useful. By the way, a little bit surprised reading in the gskinner blog 2 implementations examples. So, knowing this subject is an endless war like the Mac vs PC one Take into account:
1. AIR desktop application running 24x7 during some months in a high-end Windows PC. No user interaction
2. High performance code is a must because content loaded are full HD images My other concern is about memory leaks
In the Singleton design pattern you can throw a runtime error if the instance has already been created. But this doesn't work when your singleton class extends another class and has to call super() in its constructor, because (for some reason) you cannot call super() if you've already called throw(), or in fact, you cannot compile code that has a potential call to throw() (for example, in an IF statement) that comes BEFORE that call to super().
View 4 RepliesI have a doubt,.... How would you create a Singleton class in Flex...
Is there any convention like the class name should eb Singleton or it should extend any other class.
How many Singleton class can a project have?
Can anyone say the real time usage of a Singleton class?
I am planning to keep my components label texts in a Singleton class... Is it a good approach.
I'm trying to load swf from 127.0.0.1 into my main.swf with Flash Pro
Both swfs have Singlenton class
How to make it that loaded swf use Singlenton of main.swf ?
I did
ActionScript Code:
var lc:LoaderContext = new LoaderContext();
lc.applicationDomain = ApplicationDomain.currentDomain;
myLoader.load( new URLRequest("http/127.0.0.1/loaded.swf"),lc);
anyway I have 2 different Singlenton classes one comes with loaded.swf another in main.swf and variables not shared
is any way I can merge this values?
I know singleton class is not supporting in Flex.Because it does not access private constructor. But i want to make a class is singleton class.
View 2 RepliesI know actionscript does not allowed private contstructor at any time and But if i want to write a sinlgleton class in action script So how to implement it in actionscript.
Can anyone provide an sample example of a singleton pattern in actionscript?
I know actionscript does not allowed private contstructor at any time and But if i want to write a sinlgleton class in action script So how to implement it in actionscript.
Can anyone provide an sample example of a singleton pattern in actionscript?
I WIh know how Can I use a singleton class to make only a one instance of a movieclip on the stage.I use this code to make my movieclip instance:
Code:
var mioOggetto:wwp = new wwp();
mioOggetto.y = stage.stageWidth /2 -200;[code].....