ActionScript 2.0 :: Proper Use Of Static Variables
Dec 19, 2004
I have created a class to define my main navigation buttons. I would like to handle which button is clicked/pressed as simply and elegantly as possible, and I figured the best way would be to add a static variable to the class that keeps track of the current button pressed. Here's some quick pseudo-code. Code: class MainButton ext MC static var currentButton:MainButton public var sectionToLoad:String public static function getCurrentButton() public function getSection() button.onPress = currentButton = this // other button actions. // then i can check for what the currently clicked button // is and now access its variables. MainButton.getCurrentButton().getSection() etc. etc. etc. I am curious if this is a "proper" way to go about tracking the buttons. I find it is pretty elegant, but i'd rather make sure that this is a good practice of using static class variables. Also, it looks to me that all custom class definitions become a _global object?
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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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Jun 23, 2010
Is it "better" to initialize AS3 class variables in the class constructor? Or can I just initialize them to their default value when I declare them at the top of my class? I ask because when there's a lot of class variables, it appears inefficient to declare them in one place and then initialize them in another when I could easily do both in the same place. It one option is better than the other,
[Code]...
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Nov 11, 2009
So using AS3 with Adobe Flash CS4, what is the correct way to pass a variable from a server side script "PHP" to my SWF?
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Apr 11, 2012
I really need to send a variable via POST method to an URL and the navigate to it. navigateToURL sends variables using GET method, although I specified POST. URLLoader sends variables using POST method, but does not navigate to the URL.
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Mar 17, 2011
I have this ObjectType class which is a class to help me do something like this:
object.type = ObjectType.TWO
//ObjectType.as
package
[Code].....
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Sep 13, 2011
A reference to the prototype object of a class or function object. The prototype property is automatically created and attached to any class or function object that you create.This property is static in that it
is specific to the class or function that you create. For example, if you create a class, the value of the prototype property is shared by all instances of the class and is accessible only as a class property.Instances of your class cannot directly access the prototype property. A class's prototype object is a special instance of that class that provides a mechanism for sharing state across all instances of a class. At run time, when a property is not found on a class instance, the delegate, which is the class prototype object, is checked for that property. If the prototype object does not contain the property, the
process continues with the prototype object's delegate checking in consecutively higher levels in the hierarchy until Flash Player or the Adobe Integrated Runtime finds the property.
Note: In ActionScript 3.0, prototype inheritance is not the primary mechanism for inheritance. Class inheritance, which drives the inheritance of fixed properties in class definitions, is the primary inheritance mechanism in ActionScript 3.0.
from this I get the impression that prototypes are just static variables.. am I right?
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Feb 22, 2011
I'm a .net developer making a small website on Flash. I noticed that when I initialize a static variable during runtime in one place I cannot get its new value at another place, why?
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Jun 18, 2009
Say I have a class called Ball (movieclip) and I create a number of instances of it. There is a static variable, say, ballArray and need to access that from a different class, say, Bat. How do I go through with it? Can I access that using the class name itself (Ball.ballArray like in Java)?
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Feb 5, 2010
I've always used this way to refer to variables on my document class
Code:
MovieClip(root).variablename
But that complicates things because I would need to extend my class as a displayObject and then add it to the displaylist to be able to use "MovieClip(root)" to access the variables in my document class.. as long as variables in my document class are set out as public variables..
I didn't realise you could refer to variables on the document class by just using something like:
Code:
documentclassname.variablename
With the the variable on the document class as "public static var". This solves a lot of problems.. as now I do not need to keep adding objects to the displaylist to get access to the document class variables..
Now.. My question is..Since I want to access most of my variables on my document class.. I would need to set them all to "public static var".. Would setting 100 or so variables to "public static var".. have any disadvantages? Like performance issues... Or anything else which may make it not be as efficent if I were to keep them simply as "public var" and use "MovieClip(root).variable" to access them?
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Oct 27, 2009
Got some external classes, say MyClass.as MyClass.as has a static variable called foo
So, ordinarily in other AS files I can call this with MyClass.foo = bar;
However, this seems to be different in timeline scripts. Every time I try this I get the reference with a static type error 1119: Access of possibly undefined property foo through a reference with static type flash.display:DisplayObjectContainer.
I've tried doing an import MyClass, etc... nothing seems to be firing.
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Jun 8, 2010
I'm trying to make methods available like so:
ActionScript Code:
MyClass.myFunc();
Instead of
ActionScript Code:
var myVar:MyClass = new MyClass();
myVar.myFunc();
I know that to do so I need to declare the functions/variables/constants as static:
ActionScript Code:
package MyPackage {
public class MyClass extends Object {
public static function myFunc():void {
} public function MyClass() {
[Code] .....
When I try to access the static function through the full reference (i.e trace(MyPackage.MyClass.myFunc);), it works, while trace(MyClass.myFunc); returns undefined. This contradicts what I've read in tutorials and posts on the Internet. They all use the short syntax, not the full path.
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Feb 27, 2009
I'm literally new in AS3 and slowly trying to migrate in thats why im here seeking for help. Can someone help me how to access/control a certain public variable in a loaded swf from the main swf? this problem has been paralyzing me for days. (sigh...) [code]...
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Dec 16, 2010
When I set a breakpoint and debug my application, Flash Builder 4 is not displaying static variables within the variables window. I'm using flash builder 4 to execute flex unit tests on one of my AS3 classes. I set a static variable within the [Before] function, which is accessed in each of the tests. I've set a breakpoint within one of the tests to see why it is failing, but I notice that static variables don't appear when I expand the 'this' object within the variables window. (In this case my static variable is the only variable associated with the class, so the only object in the variables window is the "this" object). How to make static variables appear in the variables window?
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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 29, 2011
I get this error 1120: Access of undefined property OtherClass.
Ths is the code:
Code:
public class SomeClass extends MovieClip {
function SomeClass():void {
} public function SomeFunction():void {
var i:int = OtherClass.myVar;
trace(i);
}}
Code:
public class OtherClass {
public static var myVar:int = 2;
public function OtherClass():void {
}}
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Aug 10, 2011
I'm trying access a static variable located of a super class through an instance of one of it's subclasses and I'm receiving an access of undefined property error (example of which below). Creating another static variable in the subclass and assigning the value from the super class will allow me to dot operate to it.
[Code]....
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Feb 4, 2010
is it better to use public variables or public static variables?
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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.
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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;
}
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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.
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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]...
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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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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.
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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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Jun 9, 2010
I'm having difficulties doing an animation here, all I'd like to do is create 30sec animation for a big screen (without sound). It needs to have an aspect ratio of 16:9 and be exported in the file format of either mov or wmv. Any recommends for settings to do this the best way?
So far I've made my flash document as large as possible at that ratio (36" x 20" ), created the timeline to 30 seconds and started importing my graphics and such. My biggest problem I've had is when I export to mov, the animations are slow and the video time is longer than what I've set. (whereas exported as avi, the animation is normal) Any ideas on how to counter this problem?
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Aug 3, 2010
s there a possible issue in the way the button is made not coded?I am using Flash CS4. My buttons seem not to work. I do not think issue is in the action script (I am scripting in 3.0).Here is the way I make the button. I add a movie clip on the stage on the over state ( so if you were to double click on that movie clip a new time line would open), at the end of that movie clip there is a simple stop(); code on its own line. I do not add extra frame on the over state.Then I assign the code to the button and of course cross reference its name in the properties and everything is matching up. Just in case here is my code:
floralyte_btn.addEventListener(MouseEvent.CLICK, onClickFloraLytePopUp);
function onClickFloraLytePopUp(event:MouseEvent) :void {
gotoAndStop("61");
}
All of my buttons work fine through the Up, Over, Down, HIt stages without the problem. The functionality works fussy, some of them I have to click twice to go to the specified frame with the UILoader, some do not work at all and some work.I double checked and all of them seem to be done identical.
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May 29, 2009
to get a proper content of the following xml-node:
[Code]...
what is the correct way in as3 to get the content so that the " " linebreak stays intact?
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Jun 4, 2009
I am making a flash game. The game starts off running fast and smooth, however 15 minutes into the game it's noticibly slower. I worry that I am causing memory leaks by not removing objects from my game properly. I understand the whole garbage collection idea, but I still need confirmation.
[Code]...
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