ActionScript 3.0 :: Flex - Construct A Derived Class Instance From An Existing Base Class Instance?
Jan 22, 2010
I have a base class which is being created via remote_object [RemoteClass alias] from the server.I have other specialized classes that are derived from this baseclass, but serialization with the server always happens with the base class.The base class has meta data that defines what the derived class is, for example
[RemoteClass (alias="com.myco...')]
public Class Base
{
[code]....
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Jul 22, 2009
I'm trying to create a new instance of a MovieClip when the original one has been used. Would sound easy enough. Just use: var
instanceName:ClassName = new ClassName();
the class name/mc in the library im trying to duplicate is MCg1 so
var instanceName:MCg1 = new MCg1(); right?
However, the particular object in the library i'm trying to duplicate has a base class that is an external class file (just to control it's drag drop functionality)... i.e baseclass is not set to the standard flash.display.MovieClip, or whatever the case maybe. So i end out with a: TypeError: Error #1009: Cannot access a property or method of a null object reference.
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Jul 16, 2009
I'm slightly new to Flash CS3 + AS3 combo, so its more of a lack of practice question. My question stems from the problem described here http:[url].... . Note, its not the same problem, its a new one.The Problem ,So I have multiple library assets (which are on teh stage) and I want to assign similar functionality to all of them.
Attempt 1: So I create the n assets, create a custom class in AS3, link them to Flash CS3 and obviously enough it gives me the error that multiple assets can't be linked to the same class.Obvious enough to understand (well not completely, because from a programmers background it doesn't make sense).
Attempt 2: Same as attempt 1, but instead of linking all the assets to the same class I make the base class the same class, and let the derived class be dynamically created by Flash on compile time.So the linking works, but the problem is, in my base class I have a method which does something (say an tween) on a child of the library asset. So if the assets on the stage/library are called asset1, asset2, asset3 (same name for asset name, class name, id name), each of them has a sub-movieclip called ... say 'foo'. now if I manually wrote a class for each asset, I could do 'this.foo' to play with the sub-movieclip. However since this functionality is in the parent class, I'm unable to do it.
P.S. If you're form a programming/OOP background, its basically a abstract class problem. My Base class knows how to doSomething(), but it needs aSomething, which is defined in the Derived classes. However I found out that AS3 classes don't support virtual(C++ )/abstract (Java) in the true sense of the word (unless I missed some obvious documentation).
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Sep 15, 2011
I'm using a library that has a function that returns an instance of some class Engine.
I'd like to tack on some interfaces to Engine, so I subclass it class InterfacedEngine extends Engine implements AwesomeInterface. but when I change the code that uses the classes from this:
var engine:Engine = generateEngine();
to this: var interfacedEngine:InterfacedEngine = generateEngine();
It gives me a runtime error (elision mine):
TypeError: Error #1034: Type Coercion failed: cannot convert ...::Engine@1bc2bf11 to ....InterfacedEngine.
What about AS3 classes am I misunderstanding?
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Oct 14, 2009
I have to admit I pretty much ran away from Flash when AS2 came along and only used it for animation purposes over the last 5 years.So I'm having a major crash course in AS3 in Flash CS3 and I'm not enjoying it one bit. I'm getting maybe 10mins of finished work per hour as I try to figure out the limits and rules of AS3. Quite often it seems that AS3 simply can't do what I want it to. Anyway: Characterchecks.as is the main class and it loads a bunch of XML into four arrays. The file starts like this:[code]If I trace the value of, say, cc._Categories from the main FLA, it's empty. I'm guessing that the next line of AS in the main FLA doesn't wait for the previously called function to complete? (This may tie in to my next problem)My next step is that I want to display various things based on the data in the array. I have another class, Display.as which will hold all the functions to create the items on display. I thought it would be best for these to be a separate object. I wonder if I'm right?
So I declare an instance of Characterchecks in the main FLA and call it cc, and then run the functions to populate the arrays... Now I create an instance of Display and call it cd. How can I get functions in cd to see the values of the variables in cc? And if the main timeline can't tell that the functions aren't finished filling the arrays, how is cd supposed to know?I might be asking dumb questions, or maybe I'm doing things ***-backwards, I don't know. I'd appreciate any help, I really would. This whole thing has me at the end of my tether... being the most technically advanced person in my circle of co-workers and web design friends means I have no-one to explain why things need to be done a certain way or what the best way is.
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Apr 14, 2011
I'm creating a little game - The player controls a character that follows the mouse. Pigs run away from the player, and the player has to get them all into a pen. To make the game a little more difficult I'm trying to add an enemy - wolves, that attempt to perform a 'hunt' method every x seconds. This method sends a reference of the wolf instance to Main (my document class) and Main then loops through the pigs on stage to see if there's any nearby. Now as far as I know this works - my problem is I'm unsure how to send the pig instance reference back to the wolf that called the hunt method, so it can then 'target' the pig, and then attempt to pounce on it.
This is my Wolf class:
Code:
package
{
import flash.display.MovieClip;
import flash.events.Event;
[Code].....
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Dec 10, 2010
Quick question. I have been Googling this all morning, but it's either not there, or else written in a way that doesn't register. I am inclined to believe the latter, as this seems like it should be something completely trivial to me. I made a small Flash file using AS 3.0, and this is the first time I've really been able to stick to the OOP way of doing things and not hack together a mix of stuff from the timeline to get around not having everything work in the classes.
So I'd like to keep it that way, but one thing is eluding me: I can't call a method of an instance of another class (than the one I'm calling from) without resorting to "DocumentClass(root).instanceName.method." Intuition tells me there has to be a better way of doing this (like, without having to reference the document class every time I call another class instance's function; and CERTAINLY without having to use the word "root" - that just seems so Flash 5 to me. Does anybody have a better way of doing this that they can share?
[Code]....
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Jun 28, 2010
Given that both of these calls to getQualifiedClassName return the same thing (mx:Label), how would one go about programatically differentiating between an instance of a class and a reference to the class...
var lab1:Label=new Label();
var lab2:Class=Label;
var qcn1:String=getQualifiedClassName(lab1);
var qcn2:String=getQualifiedClassName(lab2);
In other words, how could I know that lab1 is of type Label, while lab2 is type "Class". typeof() simply returns "object" for both... getQualifiedClassName returns "mx.controls::Label" for both...
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Jan 26, 2009
I have a general / somewhat newbie question. Is it better practice to call a function from another class like so:
[Code]...
Does one way free up more memory or enhance performance?
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Dec 7, 2010
ObjectUtil.copy is a good technique for copying Objects. But after having a lot of problems using it to copy other classes, I guess it is not the solution I'm after.How would you approach the copying/cloning of instances of a class that you've defined? Maybe defining a function withing the class to copy it?It is cool that most variables are passed by reference in flex, but sometimes is annoying not having control over this (sorry, I'm too used to plain C).
UPDATE: I can't make the ObjectUtil.copy() work with a custom class is... is there a way to copy, by using serialization, a custom class? Did you use successfully a ByteArray copy with a custom class?
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Feb 17, 2011
Is there a way to generate an instance of a class that implements an interface based on the name of the class?
I am trying:
var ClassReference:Object = getDefinitionByName("movement.OuterSpaceMovement") as IMovement;
var m:IMovement = new ClassReference as IMovement;
trace("startup..." + m);
-But I am getting an error message ReferenceError: Error #1065 (OuterSpaceMovement) not defined.
I have several classes that implement the same interface (IMovement) but I need to be able to generate new instances of these classes and then pass these instances as a datatype (IMovement datatype) to other classes...
So then I tried:
var ClassReference:Class = getDefinitionByName("OuterSpaceMovement") as Class;
var m:IMovement = new ClassReference() as IMovement;
and this doesn't seem to work...but the following
var m:IMovement = new OuterSpaceMovement();
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May 11, 2006
I've done a class to be able to listen to the event for a CLASS not on an instance.
Code:
class net.webbymx.events.XClassEventListener {[code]....
why did I do this.It cames with my rugby game.I have player in two teams. When a player throw the ball I want the other teammate to act like "wait for ball" and the opponent like "seek for ball". Plus I'm lazy (and I don't want to register the listener for each instance of the player I'm creating). So this class is made to be able to handle as many instance of a class I want without adding a listener on each of them. I'm just creating a global listener on the class and then I will be able to receive dispatched event for any instance of this class .so in my team I can do
Code:
XClassListener.initialize(this);
this.addEventListener("throw", "net.webbymx.game.Player", "wait");
and in my opponent team I can do
Code:
XClassListener.initialize(this);
this.addEventListener("throw", "net.webbymx.game.Player", "seek");
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Dec 23, 2006
Let's say i have a bunch of balls/cells. I'm having trouble figuring out how to make it so that every other ball bounces off of every other ball.
so in short, it's really one instance being able to check all other instances of the same ball class?
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Aug 31, 2011
When I declare a class variable
private var myVar:MyClass = new MyClass();
It creates a new instance of that class that will trace as [Object MyClass].
However, as soon as I assign it to something
myVar = thisOtherVar;
It will now trace as [Object thisOtherVar].
I need to get it back to where it's just an "empty" blank class instance, if that makes any sense at all.
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Feb 9, 2010
say that i have a base class called Base, that is Bindable and has a String property like this:
[Bindable]
public class Base
{
public var msg:String;
[Code]......
where msg is some textInput field. I am getting a message from the compiler that....
Data binding will not be able to detect assignments to "msg"
is there a limitation with data binding to a base class?
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Dec 28, 2005
I have a class called Unit. When I use this class in a .fla file, I create it by saying:
var unit00:Unit = new Unit(...);
So then it creates a gfx representation of the screen for me. I would like to have a method like this:
PHP Code:
[code]....
So how do I get this to work? I know that delete this will not work when defined inside the class. How do I target the .fla's instance name when I don't know what it will be called?
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Apr 6, 2010
I mean a have a class called Login and when I make an instance of this class
PHP Code: var log:Login = new Login();
doesn't give me the wanted results.
- When it is declared Document class it adds a child on stage
- When the same class is called manually (via the above code) although I get no errors nothing is added on stage.
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Jul 27, 2009
If all I have is an instance of an object, can I call a static method of its class? For fun, let's say I don't know what the name of the class is, only the name of the static method.
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Mar 25, 2011
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
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Apr 29, 2010
I have a class ErrorMessages which holds all my error messages as static constants. So I could access them like ErrorMessages.PASSWORD_INVALID or ErrorMessage.PASSWORD_TOO_SHORT. I want to know if it is possible to have separate classes that hold subset of these constants and access them like ErrorMessages.PASSWORD.INVALID or ErrorMessages.PASSWORD.TOO_SHORT, etc. This way I can more structured static structure and makes it much easier to use autocomplete. I tried few different ways and couldn't figure out if this was possible..
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Jan 28, 2011
I am using Flex 4 and for whatever reason I cannot get the following code to work which happens inside of a ListEvent handler for a dataGrid:
_tempRule = DataGrid(event.currentTarget).selectedItem as Rule;
Rule is a custom class, and the above code always returns null. The dataprovider for the datagrid is an ArrayCollection. If I try to wrap the above code to make it like the following:
DataGrid(event.currentTarget).selectedItem as Rule
I get this error:
TypeError: Error #1034: Type Coercion failed: cannot convert Object@e15a971 to com.mycompany.arcc.business.Rule
Now I know I have done this before with native Flex classes like Button, etc, but it my case it will not work. Here is the Rule class:
package com.mycompaany.arcc.business {
import flash.utils.describeType;
import mx.collections.ArrayCollection;
[Code] .....
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Mar 31, 2011
I'm having a problem where I can't make an instance of a class in one class like I can in other classes all in the same package. When I call the update function from another class it doesn't work. I traced the xPos of the instance of the class I was talking about and I get zero, but that is incorrect so I'm thinking it's the above problem. If anyone knows what the problem is please tell. Here's my code:
[Code]...
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Oct 7, 2010
I'm creating a Papervision3D scene in a document class. I have added an instance of a PointLight3D object. I'd like to create a class that uses the light instance in the main document class for its material. What would the Actionscript be to do this? I can't refer to the light as super.light because my class is inheriting the Sphere class. parent.light does not work either (even if I wait for the class to be added to the stage).
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Mar 15, 2006
I want to retrieve the var reference of an instance of a class from within the class. For example:
ActionScript Code:
var ref:MyClass = new MyClass ();
//then via some method, I would like to get the var ref inside the class
ref.getRef(); //returns "ref" instead of [object Object]
[Code]....
You may ask why, well I want to do some spring cleaning inside this manager class I am making. Of course the above is a simplistic version of what I am trying to do.
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Jan 7, 2005
how can I self refer to an instance of a class within the class definition file?Here is an example
PHP Code:
public function fireBullet(target:MovieClip) {
Bullet_mc = target.attachMovie("Bullet", "Bullet1", 1);
}
}
Now everytime I want to call the function I have to put this as my target, (fireBullet(this))I cannot just put it in the code as it gives me an error.
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Aug 12, 2011
I'm completely confused by this. An Adobe Flex WindowedApplication has a 'menu' property, which by default is assigned a FlexNativeMenu instance, which is used to create a native menu tree for the application.For example, on OS X, if I create a WindowedApplication, I get the standard 'application menu', 'File', 'Edit' and 'Window' menus created on startup. The question is, how do I append additional menus to this without creating an entirely new menu? I want to use the default OS X menus as a starting point and add my own. If I assign menu = new FlexNativeMenu; I just get a completely empty application bar with no menus at all.
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Jun 28, 2011
I'm working (for my sins) on a Flex 3.3 project, which unfortunately cannot be upgraded to a newer SDK version at this stage, and have hit an issue with the custom hierarchical tree class (subclassing mx.controls.Tree) we're using. Excuse the spelling; the previous developer had a fear of dictionaries...
public class HierachyTree extends Tree
public function HierachyTree()
{[code].....
I'm using a solution somewhere between these two methods (basically, implementing ITreeDataDescriptor) in order to add live text filtering to the component, and it's working so far:
public class HierachyTreeFilteredDataDescriptor implements ITreeDataDescriptor
{
private var filter:Function[code]..........
The issue is that (with tree:HierachyTree) neither tree.maxVerticalScrollPosition nor the protected property tree.verticalScrollBar .maxScrollPosition updates when the search string is changed.I've tried calling invalidateList() and invalidateDisplayList() on tree — and calling invalidateDisplayList() and invalidateSize() on tree.verticalScrollBar — to no avail.
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Mar 1, 2011
I have a class with constructor and overloaded methods in it. When i try to import that class using blazeds i get an error saying [RPC Fault faultString="Unable to create a new instance of type 'some class'." faultCode="Server.ResourceUnavailable" faultDetail="Types cannot be instantiated without a public, no arguments constructor."] How to import class having overloaded methods using blazeds
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Jan 9, 2010
I have a function that takes as parameters 2 instances of a (custom) class. But they can each be one of several classes, and I need to then call another function based on what type they are. I'd like to do something like this:
function any_any(inst1, inst2) {
this[inst1.classname + "_" + inst2.classname] (inst1, inst2);
}
[Code]....
Should I go and define 'classname' in each of my classes, or is there a better way to get the class name of an instance? I don't know how to get typeof() to return anything other than 'object' for a custom class, maybe it's possible?
EDIT: It would be inconvenient to use the instanceof operator, as each class can be 1 of 6 (currently).
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Jun 7, 2010
In Flash, if i create a custom Movieclip, and compile it to a SWC, i can use it in .fla files (by linking to the .swc)..
[Code]...
All the arrangement of graphics on the custom movieClip's layers is preserved. If i subclass UIComponent and compile to a swc, I can use the custom Class in my .fla file, but the new instance doesn't seem to construct the children arranged on the layers.
I know that the correct way to make a custom component is to have the two frames, first to specify bounding box, second frame for assets, and that the first graphic in frame 1 is removed at runtime. But i'm not really trying to make a reusable component - i just want to use the UIComponent class (It seems to have some nice extensions to Sprite). As i really want some hand-positioned layers inside the component i figured i could have the bounding box as the first element on frame 1 (knowing that it would be removed), but any other items i put on frame 1 would be preserved - buttons, images, lines, etc.
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