ActionScript 3.0 :: Dynamic Instantiation Of Classes?
Jun 16, 2011
I'm building an application where it would be sweet to use dynamic instantiation of Classes.I'm using "flash.utils.getDefinitionByName" to get this done and, if I instantiate the Class in my code once, there is no problem at all.But, I want to be able to do this without instantiating the Class at least once before I go with the getDefinitionByName method.I'm using Flash Develop and the Flex SDK, coding with pure AS3.Is there any way to instantiate the Classes only dynamically?Or, any alternative to the getDefinitionByName method?
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Similar Posts:
Mar 13, 2011
import flash.events.*;
var cloudInstance:Cloud = new Cloud;
this.cloudInstance.x = this.hero.x;
this.cloudInstance.y = this.hero.y;
[code]....
I instantiate my Cloud class that has that name from the library and exported for AS.I give it the x and y positions of another mc
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Mar 22, 2008
I've just migrated to AS3 and am trying to get my head around how to instantiate library symbols as instances of a class.Here's the problem: I'm making a tile-based game with a Map object to which are linked many Tile objects. Now while I initially create blank tiles, I later want to populate them with terrain. This operation will change thus the tile's _terrainType property. Finally, I want to then draw the map consisting of its many tiles. Tiles without a terrain type will remain plain vanilla, but those that have terrain types specified would obviously appear different.
Now the Tile object itself extends Sprite, so it is a DisplayObjectContainer (k, no problems there). My question is, how do I now either a) directly assign it a library symbol graphic,following it's instantiation (if this is even possible?) or b) dynamically use addChild() to add a library symbol graphic of a certain classname (my preferred tactic)? The problem is if I have to do something like this...
Code:
var tileImg:MovieClip = new mountainTerrain();
addChild(tileImg);
then I have to write a bleedin' huge switch() statement to reference a hash table which specifies which terrain type refers to which symbol class type, which is just ugly and crap.The most logical thing to me would seem to be something like this...
Code:
var tileImg:MovieClip = new eval(classname)();
addChild(tileImg);
...but clearly I'm misguided because eval() doesn't even exist in AS3 and I have attempted it's equivalent with no likelihood of success.How do I dynamically add a graphic to represent each instance of my Tile class?
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Dec 9, 2009
Been trying to make the transition from AS 2 to 3 but not without it's speed bumps. My first major hurdle has been trying to dynamically reference a class by only knowing it's name. I came across the code of import flash.utils.getDefinitionByName; but that's not working for some reason. It keeps giving me the error:
Quote:
ReferenceError: Error #1065: Variable characterType5 is not defined.
My code in getting this is:
PHP Code:
import flash.utils.getDefinitionByName;
var className:String = "characterType" + 5;
var tempClass:Class = getDefinitionByName(className) as Class;
var char = new tempClass();
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Sep 16, 2005
I really like the fact that dynamic features are available in Flash, despite their slowness.With that said, is there any way to "auto detect" when a new property is being added to a dynamic class?I'd like something along these lines:
Code:
public dynamic class Detector extends EventDispatcher
{
[code].....
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Oct 27, 2009
if I create a new AS3 file with the following code:
Code:
function createArrays():void {
for(var i:uint=0;i<3;i++){
trace(i);
[code]....
If I set my document class to tst.as, remove all except the last line and put the following in a tst.as file:
Code:
package {
import flash.display.MovieClip;
import flash.events.*;
[code]....
or are there functions you can't build in external as but you can in the IDE?
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Jun 15, 2011
I have four movie clips in my library that are defined as classes: Option0, Option1, Option2 and Option3. I have four buttons that pass a different value from 1-4 to a function. I want to add the clip to the display list that relates to the passed value. In AS2 it would go something like:this.attachmovie["option"+currentVal, "newOption", this.getNextHighestDepth()];
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Oct 20, 2009
I'm making a program so that you can plug in your birth year and get some basic information on what Chinese year you were born in (Year of the Dragon etc).I created a class, linked it to an MC and looks like it is creating everything okay but the input text is definitely buggy.I can input text at the top of the stage but not in the actual text field.I have spent a lot of time on this and am completely clueless as to what is bugging this thing out.I guess I am not declaring something properly but I've had my TA take a look at it as well and she cannot figure it out. [code]
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Jan 2, 2010
I have this code in my class but I get undefined from the trace. I also tried "this" or "_root". I cheked the value of "step" but it is defined.
ActionScript Code:
public function storeTr(step, I, I_LVL, BOX, ANS, ANS_DUAL, RT, EXPOSURE, N_MOVES, N_OTHER) {
var obj:Object = new Object();
[Code].....
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Jan 22, 2010
From what I hear, getting/setting dynamic properties is a lot slower than regular properties.
But does allowing a class to be dynamic slow down the entire class for regular property getting/setting?
For instance, let's say I have this class (pretend those properties have setters as well):
Code:
public dynamic class Hero
{
public function get endurance():int
{ return _endurance; }
[Code].....
Obviously, calling and setting the "magic" property will be a lot slower, but will all properties become slower to get/set just because the entire class is set to dynamic?
Is it better to not set the entire class to dynamic, and instead create a new dynamic object, "additionalStats" where properties can be get/set to instead?
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Aug 31, 2010
I've been trying out small snippets of code just to practice with and get comfortable with making classes and small games.Right now I am trying to make a simple combat with Orks. Where there is a Parent Class ORK with several ORK children classes like SentryOrk, MetalOrk, etc.
The Ork class basically puts in the many stats used by the ork such as health, strength, vitality, special, luck, etc. And then the children classes modify those like Sentry Ork will have less health and more luck.I did all that fine, but the problem I have is I want there to be multiple Sentry Orks out with their own defined stats.Right now whenever I do initiate the attack one out of three orks on the screen, they all share the same health.I know what the problem is, I just don't know how to go about dynamically making each class their own?Do I have to make a whole other class to bring them onto the stage with their stats like create a new class that handles all ENEMY POP UPS? I don't see how to do that either?:
[code]...
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Jul 14, 2009
I was wondering best practices for views of inherited classes in PureMVC in this situation: Multiple classes inherit a BaseClass (lets say InheritedClass1 and InheritedClass2) Each InheritedClass has a respective view (derived from a base view class, but each unique) With a given dataset (lets say ArrayCollection of InheritedClass1/2 Objects), the respective views need to be dynamically loaded. The dataset is relatively large, so a TileList would be nice (since it only instantiates objects which are currently displayed) I can think of a couple solutions, but I find them to be too "hackish" to be the best solution:
In View: Repeater over a BaseClassView which attributes a view to a State (set to the "InheritedClass1" state to add a InheritedClass1 object) Pros: No unneeded memory increase (States' objects are instantiated when needed) Cons: View is dependent on the data types, so adds coupling In Mediator: Loop over the ArrayCollection and addChild() the views based on data type Pros: Works. Cons: Mediator is adding things to the View, which defeats the point of the separation of Mediator and View. Slower than a Repeater.
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Apr 14, 2010
The sound I wanted to stop or play are separates into background music and button sound effect. I know you could use SoundMixer.stopAll() to stop all sound, and some how exclude the bg music, IF everything is written in the same class. But what if the sounds are called from others dynamic classes? How could I target them and exclude the bg Music?
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Apr 15, 2010
How do you preload dynamic classes which loads its own content? cause theoretically speaking the classes doesn't have a size yet until it loads its content right?
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Jul 26, 2006
i'm trying to learn about clases, and i tried to make an easy XML loader, but i gotta a problem with the attributes that doen't take the value i provide with the att variable. it shows me on the trace statement like undefined, and for example if i change the atrribute instead of being dynamic, to be static, it does work.
Code:
class XMLS {
function XMLS(Path:String, textfield:TextField, att:String, n:Number) {
var miXML:XML = new XML();[code].....
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Nov 3, 2010
I am looking at the singleton design pattern and trying to really understand what is going on here. But I have some questions that it would seem my logic and/or the way I am reading this is wrong. Take the following code for example
[Code]...
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Nov 18, 2010
I created the code below which works as it should using the main timeline actions in AS3 - now, for my project I need this to work in AS3 using class files (basically I'm creating an app which uses pages as class files. This is intended to go on the 2nd page.for some reason though when I've copied it into my project and instantiated it when the page loads, even though all traces say that the squares should be there - they are not! The best I've had so far is one square in the final position![code]
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Apr 26, 2010
What's the difference between Extends and Instantiation? It seems like they're both ways of getting content from a class.
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Feb 10, 2010
I'm getting the following error:TypeError: Error #1007: Instantiation attempted on a non-constructor.at Website()[/Design/The Silver Collective/_classes/Website.as:42]
This is line 42:var top = new top();
package {
import flash.display.*;
[code].....
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Jul 28, 2010
I'm gettnig the following output on the code below - Its driving me mad trying to find th eproblem..
TypeError: Error #1007: Instantiation attempted on a non-constructor.
var nc:NetConnection;var ns:NetStream;
var nsPlayer:NetStream;var vidPlayer:Video;
[code]....
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Jul 6, 2010
Is it possible to have a string "ClassA" and use it in order to instantiate a real ClassA in my application?
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Mar 10, 2011
I am trying to call a custom component but it keeps telling me this:
TypeError: Error #1007: Instantiation attempted on a non-constructor.
at flexlib.containers::WindowShade/createOrReplaceHeaderButton()[C:UsersuserAdobe Flash Builder 4flexlibsrcflexlibcontainersWindowShade.as:205]
[code].....
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Jun 27, 2011
What is the difference Between Extends and Instantiation?
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Oct 22, 2009
I wrote a script to make a random image from an array appear and float up through the stage. The problem is that at some random time in the movie, i get the error: TypeError: Error #1007: Instantiation attempted on a non-constructor. at Untitled_fla::MainTimeline/enterFrame() This occurs at random intervals. From that point on, the script stops working. There must be something wrong with the way I generate MCs from the array.[Code]...
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Sep 4, 2010
first it might be valuable to mention that i have a one document class and a child of that class, which is the one im having problems with. My library objects is added to the stage perfectly, but after i wrote the last code (in bold), i get:
TypeError: Error #1007: Instantiation attempted on a non-constructor.
at Entity/moveE()
[code]...
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Aug 2, 2007
I've been coding a bunch of movie clips as buttons (gives me more flexibility) and the lines of code is phenomenal... was wondering if i could create a template of functions, and instantiate it for each object?
ActionScript Code:
unimatic.onRollOver = function() {
unimatic.gotoAndPlay(2);
[code].......
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Mar 15, 2012
I am just trying to explore flash by my own little cognitive thinking..
import flash.events.Event;
var slot:Array = new Array(26);
var letters:Array = ['a','b','c','d','e','f','g','h','i','j','k','l','m ','n','o','p','q','r','s','t','u','v','w','x1','y1 ','z1',"hypen"];
var posx:Number = 125.5;
var posy:Number = -47;
[Code] .....
And the error is pointing in this line of codes:
this[getChildByName(letters[rand]+counter)] = new this["mc_"+(letters[rand])];
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Dec 19, 2010
I found two difference that I feel might be important:
-If I decide to put the variables within a constructor, then I must have an object parameter for any function that wish to alter the variables, even if the code is internal to the class.
-Subclassing would cause the variables to not appear, something that causes problems when the class and any subclasses must have the variables in order to operate properly.
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May 20, 2011
I am instantiating the 'Target' object five times on the stage. This is happening, but only one object is able to have hitTestPoint performed on it. Can anyone help as to why this is happening?[code]
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Jun 29, 2011
how can i get any classname from a string without instantiation ? [code]
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