Actionscript 3 :: Prototypes - Are They Just Static Variables?
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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Nov 13, 2006
I'd like to use an array/variable with the lmc 1.2 tweening prototypes. I can't seem to get this to work. Can anyone see anything wrong with this code:
Code:
var myArray:Array = new Array("circle");
myArray[0].tween('_x', 400, 2,'easeInCubic', 0);
I've also tried:
[Code].....
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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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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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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
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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
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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();
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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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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.
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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
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Jul 24, 2003
Can somebody post some links on how to do prototypes and functions??
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Dec 6, 2004
I want to apply two different prototypes to one mc (one for movement, one for behavior), but both prototypes have onEnterFrames in them...so the one executed last works but the one executed before it won't.
(It may sound terribly ineffecient to have 2 prototypes for 1 mc, but one prototype is applied to many mcs, and the other is applied to only certains types of mcs (in this movie)).
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Jul 25, 2004
I've been trying to learn how to use prototypes recently, and I want to make one that resizes a box, with elastic action. There is a button, and a box movieclip. What I want to happen is when you click the button, a prototype is run to resize the box. But, when I click the button, nothing happens. I feel I'm close, but lost :S
Code:
// Resizing prototype
MovieClip.prototype.resizeBox = function(w,h) {
this.onEnterFrame = function() {
this.inertia = .6;
[code]...
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Jul 25, 2004
How to you assign prototypes to components?
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Nov 8, 2004
I have a movieclip prototype which I want to be applied to different movieclips every so often. The prototype controls it's movement, when it runs, the mc eases to a random x and y and stops. After that I want it to keep executing that movement prototype over and over, ie, keep moving around. I know how to use setInterval with functions, and I know movieclip prototypes basically are functions, but how can I get setInterval to work with movieclip prototypes assigned to specific movieclips?
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Dec 1, 2003
When you click each navigation button it slides to each section of pictures, each picture has an invisible button on top of it and each invisible button has its own individual instance name. When you click the picture (invisible button) it should load a seperate external swf into another movie clip I have set up. However because I have about 216 pictures (and hence 216 swfs) I dont want to have to make add a loadmovie on each button, that would get very repetitive and would increase the file size.
SO Im trying to be a smart coder here and do it dynamically. I KNOW this is possible. I want the swf to load based on the instance name of the button. I have seen this done with text files before using the _name command and it worked marvelously using loadvars so im just trying to do it using loadmovie instead.Have a look at my code.
//======================================
//========================Dynamic Movie load
//this movie initializes 2 prototypes then assigns the prototypes to each button
[code].....
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Sep 25, 2002
here is the swf of the menu I was trying to build using a class and prototypes.
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May 19, 2003
So, right now when I want to find the distance between two points, I go: dist = Math.sqrt((this_x-that_x)*(this_x-that_x)+(this_y-that_y)*(this_y-that_y)) BLECH! I don't want to do that every time. So I want to make a nice little function that I can apply to an object. Problem is, I don't know how to do this. Is it possible to end up with something as easy as: Math.dist(thisclipname, thatclipname)? How do you guys set up functions that do bulky math and return nice clean numbers?
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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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