ActionScript 3.0 :: How To Not Call Parents Class Constructor
Nov 17, 2009
This is my first post. I'm new to actionscript, but not to programming. I hope to learn a lot from these forums. To the point: I decided a few days ago that I wanted to create a flash game. I'm taking an object-oriented approach to the game design since that is what I know. The issue I am having is that I have a class called Hero that inherits from a class called Entity. Now my issue is that I don't want Hero to call the Entities class constructor when I initialize a new Entity.
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Similar Posts:
Apr 14, 2012
I'm making a game in action script 3. In it, I have an actor class from which player and enemy classes will be derived. I'm doing this so that unless I need to provide specific AI or fancy behavior (such as for bosses), I can just make a new clip in the library for each enemy without making an actionscript file.
However, I've run into a problem.
Whenever I try to pass arguments to the construction of an enemy (make it spawn with more health), I get error 1136 (Incorrect number of arguments.)
This is because the constructor created automatically at runtime doesn't have the same arguments as it's parent class. Is there any way to get around this without making a class file where I copy and paste the parent constructor function for each of my hundreds of enemies?
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Aug 29, 2010
For Example:
package{
public class A {
var test:String;
public function A()
}} class B{
}
The code is in the same file, we call B is inner class, then how to call the constructor of class B
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Oct 9, 2008
In the AS3 there is a remark, that a Class Constructor is just a method of the class, that is executed when an object of that class is created. So, since the constructor is just a method of a class, how can I call it directly from the other class methods?
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Jan 29, 2011
I want to create an instance of a subclass from inside a static superclass method. Here is an example:
class Base
{
public static function createSubclassInstance()
[code].....
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Jan 20, 2011
I'm attempting to call a Class constructor dynamically using factories:
ActionScript Code:
public function construct(classRef:Class, initArgs:Array):* {
var factory:ClassFactory = new ClassFactory(classRef);
var classInstance:* = factory.newInstance();
return classInstance;
}
This works just fine, except when the constructor of the classRef being passed in requires arguments, as in the sample class below:
ActionScript Code:
public class Foo
{
public function Foo(arg:String) {
[code]....
Is there any way I can call construct(Foo, "Hello World") and have it properly pass the parameters to Foo's constructor? (I'm not locked in ClassFactory, by the way, I also tried classRef.apply(initArgs) and a few other hacks to no avail.)
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Feb 17, 2011
I've got a simple program that consist of a document class and a buttonTemplate constructor class. I need to call a function called updateText that should be in the document class, when someone clicks on a button. My event listeners for the buttons are in the buttonTemplate class. My question is, how do you call a function in the document class from a constructor class? Here is my simplified code below
DOCUMENT CLASS
Code:
package {
import flash.display.MovieClip;
import flash.text.TextField;
[Code].....
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Sep 24, 2011
I always don't call super() when I extends Sprite.But doesn't not calling super() cause any problem?Till now, I don't have any problem and I have never seen code which call super() in constructor which class extends Sprite. How about TextField? I don't have any problem about TextField, too. How to know whether I should call super() or not?
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Jan 18, 2011
My parent ActionScript3 file has functions like these:
package
{
*lots of import.*
public class Tabu extends MovieClip
{
[Code]...
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Sep 7, 2010
I have a class. I can call the constructor (initialize the class), and the constructor can then call a function/method inside it's own class (so I know it works), but when I try to call the same function/method myself from the instance of the class I just initialized, I get an error.
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Oct 20, 2011
I'm working on a web app built in Flash AS3. At a high level - the app has a main screen, and several "modal dialog"-type screens that pop-up to manage various user interactions. (This is a similar pattern I use in most of the apps I develop...) Typically - when the user clicks a UI control on the dialog screen (e.g., button, text box, slider bar, etc.) - the main screen needs to react, or manage the consequences. It seems like there are two general ways to handle this: Have the dialog screen dispatch events that the main screen listens for Allow the dialog screen to call functions in the main screen when those controls are clicked (which requires that the dialog screen maintain a reference to the main screen, and that the functions in the main screen are public)
In general - I understand that one of the key benefits of the first method is that the dialog screen isn't so tightly coupled; it's only responsibility is to broadcast the event. This would allow me to more easily use the dialog class in other contexts, or applications. But for many RIAs I develop - a particular screen is SO SPECIFIC to the the application that there's no chance I'd ever reuse it in another application. So, the "easy re-use" benefit is minimal. So - if you eliminate that benefit - which method is actually better? (More performant, less resource-intensive?) For example - if I use events, then Flash needs to manage many listeners for events that may never occur. So - it might be more efficient if the dialog window could call a function in the main screen directly, instead of dispatching an event.
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Jan 15, 2010
Is there any way for movieClips to share the same class definition?When you have alot of objects to keep track of it becomes a pain to have to write separate actionscript files to do the same thing.For example if I:Create an actionScript file which extends movieClip with the name ClassX.as with all the nescessary code incased in package{}I try properties>export for actionscript>ClassX.as for two movie clips (each with different graphics).An error occurs on the 2nd movieClip complaining that the class I used was not unique. y other question is how do I make an actionscript file file that both extends a movieClip and another class.For example:In a game there is a movieClip for an enemyShip1 with its own class definition contained in an actionscript file (defining its behavior)There are 2 child objects enemyShip2A and enemyShip2B each of which have there own images,class definition but which inherit all the functions from the enemyShip1Class.It would seem that the logical thing to do would be:
package
{
//import extentions.*
[code].....
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Sep 20, 2009
I am creating a Weapon class for a game and the weapons itself will be the sub classes. The sub classes will hard code some values (such as max ammo and the weapon name).
I trying to access this declared data in the base class constructor, at the moment it's not outputting the values. Is this possible?
I've broken my Weapon class for simplicity:
ActionScript Code:
package
{
import flash.display.MovieClip;
[Code]....
My current workaround is creating a protected method in the base class to trace the information and calling that method in the sub class's constructor, this works fine but this doesn't seem like the most efficient technique?
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Mar 15, 2010
I'm having a problem using superclass constructor with arguments. I've searched all over for the solution and found some really useful advice. Problem is i;ve followed it and it doesn't work... not for me anyway. So i've learned that you need to callthe super constructor in the subclass' constructor to avoid this error. problem is, this code still gets the same error....
[Code]...
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Jun 9, 2009
I worked out a way to call a function whose name is in a String variable. That is:
function myFunction()
{
trace("Hello!");
}
[Code]....
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Oct 28, 2009
I just posted a message asking how to call a method from the constructor which has the parameters e: Event. I mistakenly ticked that post as answered when in reality it isnt. I was told I could add = null in the parameter of the function to make it work, like this:
[Code]...
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May 9, 2011
I want to clone a class object. I tried following from here:
package
{
import flash.net.registerClassAlias;
import flash.utils.ByteArray;
[Code]...
BUT this only works when the class has a default constructor and not when it has parameterized constructor:
how to clone a class object when the class has a parameterized constructor?
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Aug 28, 2009
I am trying to things efficiently and put as little code as possible on the timeline.
I have a document class loading and working at runtime.
It creates a button that takes me to a different frame on the timeline.
I have a movie clip there. I put a trace in the constructor of the class of that movie clip but it will not show the trace comment in the output window-its not working. There are no errors.
I also tried instantiating the same movie clip from the document class-which worked-but the trace in it's class's constructor still does not output.
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Oct 11, 2009
I'm making a class called 'player', and really, I don't need a constructor function for it. Do you just outline the function, but don't put anything between the curly braces? Also, I'm a bit new with access levels. If I wanted my functions from my player class to be accessible from the main class, do I make them public?
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Mar 10, 2010
am trying to pass a movieclip reffrenc to a class, but i want it to be optional, so am trying to initialize it, but it dossent work, why?
public class CoverFlower extends MovieClip
{
var playBtn:BigPlay = new BigPlay();
[code].....
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Jan 25, 2010
I'm doing something - probably very stupid - with an external library swf. That swf so far contains two buttons each with their own classes 'Simple_Button' and 'Simple_Pop_Button'. In the library swf document class I set up an object that lists the available classes:
Code:
oClasses = {"Simple_Button":"com.Home.Button.Simple_Button",
"Simple_Pop_Button":"com.Home.Button.Simple_Pop_Button"};
In the swf that loads the library swf I process that object and create another object with proper class references based on it:
Code:
function initHandler(event:Event):void {
defineLibraryClasses(event.target.content.getClasses(), event.target.loader);
addBtns();
}
[Code]....
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Nov 22, 2010
i have some pretty simple code, i have my document class trying to add a santa class to the stage (simple game ) - but it will not add and i get not errors at all,Santa class:
Code:
package Classes {
import flash.display.*;
[code].....
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Oct 22, 2011
I have a custom class, MyMC. The only argument the constructor takes is a string, which sets the text of a label inside MyMC.
In the Flash IDE I've placed an instance of MyMC, which is called mcOnStage, on the stage. Through the document's class Main I'd want to perform the constructor function of mcOnStage.
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May 5, 2010
I have a bunch of sprites in my library which all behave in the same way.
now i want to put the behavior and all the common methods into one BaseClass [code]...
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Sep 17, 2009
I'm working on my document class and the contructor is running twice, hence it is running almost all of my code twice.[code]
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Sep 29, 2010
I fell on an unexpected comportment with AS3 class definitions this morning. To tell it quickly, I cannot create an instance of a class inside the same class methods.
Here is an exemple :
package {
import flash.display.MovieClip;
import flash.events.Event;
public class Test extends MovieClip {
[code]....
I would like to understand the sub-process that prevents to do that.
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Oct 26, 2011
I'm trying to pass my object class as constructor argument. I have something like this:
package myclass {
import flash.display.MovieClip;
import flash.display.BitmapData;
import flash.display.Bitmap;
[code]....
Now, when I try to create my Example:
import myclass.Example;
var example:Example = new Example(myObjClass);
I get message, that I'm not passing any variable (Error #1063). Why is that? What is wrong with it?
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Jan 26, 2009
I have a document class name elevator and my constructor is also elevator as usualHow to call this constructor function within elevator class? Is is possible or not?
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Jun 24, 2009
I want to pass values to document class's constructor form html while embedding.
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Feb 11, 2011
constructor function in a Class file. I've built several over my day and never heard a 'proper' answer about them. If your constructor function does nothing, not even set vars or listeners
ActionScript Code:
public function MyClass():void{
}
is it proper to keep it in the Class file or is it ok to leave it out completely?Or is this just something of preference? What do you guys think/do?
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