ActionScript 3.0 :: Static Initialization And Autonomous Singletons?
Sep 16, 2010
I work mainly in C++, and at work we use this awesome autonomous singleton pattern where you automatically add statically instantiated classes to some global list. If you're familiar with c++, imagine something ala:
class CuteSingleton : public ISomeInterface
{
*** stuff ***[code]...
So basically, CuteSingleton is instantiated at DLL load time and added to a global list of ISomeInterface interfaces. This is really powerful because it lets us rapidly prototype tons of code without polluting our existing codebase by having to include these prototype files, instantiating classes like CuteSingleton in a big initializer list somewhere, etc.I've been trying to figure out how to do something similar in actionscript for a few days now and I'm coming up empty handed. All I want to do is have this code instantiate this class without having to reference it in some other files:
package EntitySystem
{
public class EntityManager extends AutoGameSystem [code].............
View 4 Replies
Similar Posts:
May 10, 2011
I've got a component written for my app by a third party developer and am trying to integrate it, but I've found a bug that seems like it's either a compiler bug, or there's something with how Flex and static variables work that I wasn't aware of.Basically, I have this:
public class ModeChangeController {
public static const DISPLAY_MODE:String = "DisplayMode";
}[code]...
If I use //V2 (i.e. comment out V1), a bug occurs at the startup of the application (some TextFields are uneditable and contains no text), but with //V1 and not V2, it works fine. If I comment out both, that also works fine (I don't get the TextField bug).It took me a while to figure out that it was that static const String that was causing the issue, but I'm still not sure why or if there's something I can do about it except for just moving the DISPLAY_MODE to Events (which is what I've done at the moment, but it's not a particularly nice solution).There are no errors in the log. The order of the includes in my BorderContainer code doesn't matter. I've googled for "as3/flex static initialization order" but haven't found anything.
Clarification: showInitialView() never gets called. It doesn't get there before the other bug shows up. Just having the V2 line there causes the problem.
Update: I've fixed my problem with the TextInput strings not showing: Turns out that adding the component caused the Tahoma font to not show up. However, setting the font-weight to bold fixed that problem, or switching to Arial. With that said, the original question still stands, because when I ran it without V2, it found Tahoma with normal font-weight.
View 1 Replies
Feb 3, 2011
I previously used Singletons for global classes, if it's absolutely necessary i.e. logging, error handling. But I am now using unit testing which doesn't like these! I would like to ask a basic question on globals. What's the point in them? What's wrong with creating a new instance of a class when you need it?
View 2 Replies
Mar 22, 2011
I'm dealing with the scenario whereby my code might be included in other Flash content either included via import .as commands and then referenced as a Singleton, e.g.
import com.as3.Singleton;
Singleton.birth();
Singleton.getInstance().test();
[code].....
View 2 Replies
Dec 14, 2011
I have an AIR application that uses Singletons to manage global state throughout the application. Works great for what it does (manages a network appliance). But now the client wants to spawn multiple application instances from the first instance so they can manage multiple hardware devices at the same time ... kind of like a dashboard but lots bigger.
As you can guess, I coded myself into a corner with the singletons so if I refactor the application to have a bootstrap class that launches the application logic with a button, let's say, that spawns another window that contains the same application logic, then the singletons are shared across both app windows whereas I would have liked two separate instances.
Is there a way to use singletons ( or something else ) to keep global state but create multiple instances in one application where each instance needs it's own state manager?
View 1 Replies
Jan 26, 2010
Once you load an actionscript page from scratch (in my case loading XML data from a file, initializing various other elements in a fairly time consuming way) if you navigate away from that page and then return to it, (via the browser 'back' key for example) is their a way to forego the previous initialization and just immediately bring up the previous Actionscript page in its fully initialized state.
View 2 Replies
Nov 7, 2010
I have created an X*Y grid of rectangles that cover up a movieclip (R). I put these into a 2d array (for easy access) and in a container movieclip which I use as mask over R. Now when I move one of the small rectangles R.width to the right when I am still in the constructor, a small bit of R will become invisible. But when I do this inside the function which handles mouse events, nothing seems to happen.
ActionScript Code:
package documentClass{
import flash.display.MovieClip;
import flash.events.Event;
[code]....
View 0 Replies
Oct 22, 2009
how bad is this practice? I am having trouble getting to some stuff so i am taking the easy way out
Code:
private static var _interrupted:Boolean;
public static function setInterrupted(value:Boolean):void{
_interrupted = value;
}
View 1 Replies
Feb 7, 2011
I installed cs5 creative suite on windows 7 64bit, I've got cs4 creative suite installed, all programs work fine, only flash cs5 has a problem, when I try to launch it, it loop after the write "I'm creating the workspace ... " (similar). It loop to infinite, I see the logo and a window with label = "flash cs5", into the window there isn't nothing, only a white page with the "cursor wait".I tried all the advise by adobe (on google cpsid_82252) but nothing work fine ... I re-installed all creative (after WinCS5Cleanupscript) but nothing ...
View 3 Replies
Jul 12, 2009
Assume you have a variety of number or int based variables that you want to be initialized to some default value. But using 0 could be problematic because 0 is meaningful and could have side affects. I have been working in Actionscript lately and have a variety of value objects with optional parameters so for most variables I set null but for numbers or ints I can't use null. An example:
package com.website.app.model.vo {
public class MyValueObject {
public function MyValueObject (
_id:String=null,
_amount:Number=0,
[Code] .....
The difficulty is that using 0 in the above code might be problematic if the value is not ever changed from its initial value. It is easy to detect if a variable has a null value. But detecting 0 may not be so easy because 0 might be a legitimate value. I want to set a default value to make the parameter optional but I also want to later detect in my code if the value was changed from its default without hard to debug side affects. I suppose I could use something like -1 for a value. I suppose it depends on the nature of the variable and the data.
View 7 Replies
Apr 19, 2010
As I currently understand, if an event listener is added to an object with useWeakReference set to true, then it is eligible for garbage collection and will be removed if and when the garbage collection does a sweep.
public function myCustomSpriteClass() //constructor {
this.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownListener, false, 0, true);
this.addEventListener(MouseEvent.MOUSE_UP, mouseUpListener, false, 0, true);
}
In this case, is it not appropriate to initialize an object with weak references event listeners, incase the garbage collector does activate a sweep removing the objects event listeners since they were added during initialization of the object? In this case, would it only be appropriate to create a type of deallocate() method which removes the event listeners before the object is nullified?
View 1 Replies
Oct 25, 2010
I am loading a component which makes a HTTPService call to get data that will then be used to set certain variables in the component. I make the HTTPService call in an init() function (for the initialization event) and then set the variables according to the data received in the HTTPService result handler. However, the variables are still null at both the initialize stage and at the creationComplete stage. If I try and read the variables in a creationComp() function (for the creationComplete event), those variables are still null. Is this correct?
I guess I don't understand the flex initialization cycle very well. When are those variables actually set and available to be used? I need to manipulate those variables automatically after the component loads. Is there an event that comes after creationComplete that is appropriate or some other way to approach this? I am using Flex 3.
View 2 Replies
Feb 21, 2009
I have two questions.First: I created this class, which supposed to create sort of 3D cube
Code:
package
{
[code].....
View 3 Replies
Dec 3, 2010
I'm trying to buid a video player application usin the Youtube API, which is loaded remotely from their servers as described [URL]...reference.html Basically I want to add a playList via XML or flashVars which would be stored in the Model among other data taken from the video feeds of youtube by HTTP request. The issues are:
1.- I don't know where the youtube API would fit in the MVC pattern, because it has two parts, the Loader instance that you can add to the display list and the API Object itself that is more like a controller. My first approach has been to create a controller class which loads it and initiates it. But then I have to provide a reference of the loader to the View. Should I do it using a setter in the view, dispatching an event and then a listener in the view gets this reference from the controller, or including the reference in the model??? I'm a little bit lost here.
2.- On the other side, I don't know how to implement the strategy pattern betwen the view and the controller in this scenario. Should I leave the whole initialization process outside the MVC pattern? It's not that I'm obsesed with design patters, I'm just trying to learn how to use them and put myself this as an exercise: Build a videolist player for youtube so that it's easy to add, let's say Vimeo support later.
View 1 Replies
Aug 25, 2009
Let's say you have the following situation:
1. Static var(an Array) stored in a class.
2. You create a variable reference to the static class in a separate class.
3. Splice some items from the reference variable in the separate class.
4. Trace the static class and the items have been removed from that too.
5. Verify several times.
6. Get confused.
7. Post on Kirupa.
View 3 Replies
Jan 6, 2010
Ok, so I have a bit of a mess here (Which I'm probably not doing right anyway, which could be my problem...). I have a document class, I'll call it as Body.as, that creates an object from another class known as Headgear.as. There are also other objects created from other classes, or will be in the future. Now, amoung all this, Headgear.as and all of the other classes Body.as will use to make objects require the use of dragging functions (starting and stopping dragging). On stopping drags, position checks are then made to compare a particular hidden movieclip with the dragged MC.
To try and save myself some hassle (from making the same functions over and over to ensuring that when the objects are created I don't need to send a complete crapload of variables just to ensure the position checking function would work), I had the functions for the event listeners (Which are set-up on the draggable MCs in Headgear.as) just direct to functions in Body.as
[Code]...
View 6 Replies
Feb 22, 2011
Following error is arising if I use NavigatorContent in Repeater. Is there a way to initialize image and lable on which I am encountering following error: Unable to generate initialization codewithin Repeater, due to id or databinding on a component that is not a visual child.
Code:
<mx:Repeater id="rep" dataProvider="{usersArray}">
<s:NavigatorContent width="100%" height="100%" label="{rep.currentItem.name}" >
[code]....
View 1 Replies
Dec 20, 2011
I need to completely initialize a custom component in my Flex app (i.e. I should be able to access it from action script and get its properties and its children etc), But I do not want to add it to the display or make it visible. I have tried to add it to my visible component, but keep it visible, but often many of its properties are set only when it is drawn, so i don't get what i need. Is there a way to add a custom component to some sort of 'Virtual' display, that is not visible to the user?
View 3 Replies
Apr 27, 2006
So I have a movieclip that I want to play nice with my class file. So I set the linkage and all that and it works. But, my initialization function gets called with no parameters, because I have not set any. How do I do that with this method?
I've tried something like:
Code:
import tab;
tab1_mc = new tab("left", 5, 55, "testclip.swf", 0);
And that sets the parameters, but not before the linkage on the MovieClip fires. how to get the best of both worlds?
View 7 Replies
Mar 3, 2011
My Flex application (SWF) initialization takes 25 second to load 1.6mb SWF in widescreen monitor. The same SWF loads pretty fast (3 Sec) in Flat panel monitor 1024x768 resolution. What is the reason for +/- in rendering speed , +/- in CPU utilization on different monitors , screen resolution.
note: my internet sepped is 10+ mbps broadband.
View 1 Replies
May 27, 2011
I am trying to write a simple multicore PureMVC helloword. I am getting Error: multitonKey for this Notifier not yet initialized!
[Code]....
View 1 Replies
Jun 7, 2011
I have a Spark list with a customItemRenderer that is taking a good 3 seconds to initialize with just 50 items.
I'm using Flex 4.5, my ItemRenderer is already very optimized, using as little nesting as possible, fxg and so on.
Is anyone having similar issues? I've tried almost everything in the book bar going back to mx.
View 3 Replies
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 ??
View 3 Replies
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?
View 9 Replies
Nov 22, 2009
Alright, so I have a class that is linked (via the linkage panel) to a scrollbox class. I'll paste the class here:[code]Ignoring the formatting, the commented out functions are the ones causing the issue. Adobe says that it's a static class and I can't use non-static functions. The way I wanted to use it was:
1. Call the page button generating function above.
2. In the main code in my program is this line:scrollbox.setClickFunction(historyContent.generate Page);So when the buttons that are supposed to be generated are clicked, the scrollbox class can call the History pages generatePage function and pass it which page to show. (I did this because there was a lot of text and a limit on how much would display, so small chunks sounded logical).
3. In the onClick function (which I haven't finished yet because the rest wont work), when you click one of the buttons it calls the set function. Its that simple.
View 4 Replies
Sep 3, 2009
The jist of what I'd like to know and focus on understanding, is details on how binary deserialization occurs in Flex 3. When is the constructor called, when are properties set, are private members serialized or does all deserialization occur on and through setters, etc? I'm having a hard time finding information on this.In a Flex 3 AIR application, I have a pretty complex object graph(just a bunch of objects referencing one another, kinda like a big data model except a bit more complex) that I serialize to a file using a single call on the FileStream.writeObject and readObject on a root object, which serializes and deserializes the entire object graph.I found that I needed to always have a default constructor, else I would get exceptions on the objects when deserializing if they were part of an ArrayCollection. So I had to eleminate the constructor parameters or set default values. I now have many setters like this in my classes, such as the below where mConnection accumulates some information it needs through different setters, where as before I had this all packed into the constructor since all of the information is really necesary for the Connection to function:[code]So the connection's serverIP is still an empty string because the server was assigned to the client's property before the server was completely initialized.
I could probably resolve this by using binding so that updates to the serverip in the server are bound to the connection, but I find binding properties to be fairly complicated (it's really simple on UI in mxml cause you just use the curly bracket syntax but doing it by code is what I found complicated). I have also resolved some cases by removing the constructor parameters entirely, so that there is no default values. All that aside, I still really need a deeper understanding of the details of binary serialization as far as how it rebuilds the object graph. I even have circular references, and it seems to handle those fine and maintain multiple references without duplicating objects. It's just when my constructors/setters are more complex that I'm running into these problems because of the order of what occurs during deserialization. It is really inconsistent though, as adding breakpoints in various places seems to influence the order that things occur, making it more difficult to debug.On a side note for anyone that might sidetrack the topic because I am serializing a class called Connection. I added some code to address some things, like in the Connection class there is an instance of a Socket. Of course my socket would not be connected after I close and reopen the application and deserialize it, so before I serialize my object graph, I go through and close the socket and set the reference in the Connection class to null, so that there is no longer a reference to the socket and thus it will not get serialized. After deserialization on the next application run I create a new socket.
View 1 Replies
Jan 25, 2012
I am working on a server push from Java to Flex. But some how the MessageBrokerServlet is not getting initialized, seems like it is calling a method from: flex.messaging.config.LoginCommandSettings.setMatch() Eventually I found out that this method indeed does not exist in that class (LoginCommandSettings). I there something else that is going wrong?
[Code]....
View 1 Replies
Dec 5, 2005
I initialize the "point" object like:
point = {x:'209', y:'270'};
trace(point.x);
this is working fine, But I have to initialize the "point" object with a string variable which holds the initialization properties like:
[Code]...
I know this is not working. Is there any method to initialize the object with a string variable which holds the initialization properties (without parsing the text) ?
View 7 Replies
May 4, 2009
I'm kind off oblivious as to what I'm doing wrong here... I have two classes: - Alley - AlleyCat
[Code]...
View 8 Replies
Apr 16, 2010
I'm getting an odd error from my composite canvas component: An ActionScript error has occurred:
[Code]...
It seems to be related to the fact that my composite component has a child and I'm trying to add one in the place I'm using the component. So how can I do this correctly? omponent code looks like this (EditableCanvas.mxml):
[Code]...
View 2 Replies
