ActionScript 3.0 :: How Does Extends Relate To Getter Functions
Jan 21, 2010
Like I understand that if you're assigning something within a class it would have to involve what's extended to this class.So if a class extends MovieClip, would you only Set properties that involve the MovieClip object?Adversely, with Getter functions you could be retrieving anything from XML to volume. So that can't have anything to do with what that class is extending towards right?Is that how the extends relationship works with Get (return) and Set (value) functions?
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May 26, 2010
I have two functions one that sets and one that gets a number. The set one works, but the get one doesn't. I have it trace the set it returns the correct number, but when I set the getY function, it doesn't give me anything at all. When i took the number out of the trace it just gave me back only text. What am I doing wrong here?
ActionScript Code:
public function setY(y):void {
y = y;
[code].....
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Jun 4, 2009
i came across this problem and i have no clue why it's happening. basically, consider 2 nested movieclips on the stage, something like stage -> main -> filler. both movieclips have instance names (main and filler).
[Code].....
this throws an error 1119: Access of possibly undefined property filler through a reference with static type A. can anyone give me a hint on that, as it works with class A, but not B extending A? i understand it was meant to work?
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Mar 8, 2009
I have been using Flex Builder for a while now, infact since i started coding in AS3 Projects.One of the fundamental issues i have from experience of trying flex, is i dont see how MXML tags and AS3 is related.Can someone try to explain to me from an Actionscript perspective?If i create a PixelBackgroud.as class which extends sprite and draws a random pattern, then how can flex use that class? Does it automatically become <PixelBackground /> ?
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Feb 16, 2010
I have the following code:
Code:
for(var r in map.Region){
var region : MovieClip = getChildByName ('R' + map.Region[r].Id) as MovieClip;
[code]....
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Jun 30, 2009
How do I relate a variable to an object on the stage? I want to have a mouse over and a mouse out effect on a button yet when I use the code below I get the error:
ReferenceError: Error #1065: Variable button is not defined.
obviously the object on the stage is called 'button' but I didnt think I had to define objects as variables? I thought the below code was correct?[code]....
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Apr 27, 2010
I want to perform keyboard equivalents instead of using my moouse to navigate through my project. I want to use left to go back a frame, right to next frame and up for home and down for exit. I've put here my code for the button instance (NEXT15). How can i capture key presses and relate them to these buttons.
[Code]....
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Apr 12, 2006
Im trying to get the X, Y of a Movie clip (well call it "target_mc").its inside of a parent MC (well call it...."parent_mc")but im trying to get the X,Y as they relate to the main stage(_root).so far the two methods ive used are
Code:
this._x = _root["parent_mc"]._x + _root["parent_mc"]["target_mc"]._x
this._y = _root["parent_mc"]._y + _root["parent_mc"]["target_mc"]._y[code]....
neither worked
it seemed like the first method(the one in the code block) places it at the starting position of the MC i need the location of, but to further complicate it the parent_mc is a rotating clip(Ive got code to make it follow the mouse).how i can place this in a location that is changing whenever the mouse moves
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Nov 20, 2010
I'm a bit rusty of my trig, so I'm not sure the best way to do this ... I need to position 2 movie clips on the stage that relate to each other they can't be nested ,the registation points are in the center, assume "clip B" is 50 px to the left of "Clip A" as pictured in the diagram to the left , when "clip A" is rotated, I need clip B to follow ( still 50px ) away but with new _x and _y relative to the rotation of "clip A" as in the diagram right.
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Apr 4, 2011
I wondered if anyone can provide any information on how flash events relate to the DOM event model.My issue is this:body > div > object.The div has a mousedown event which calls 'preventDefault' on the event object.This shouldn't bear any relation to a click event within the objects swf however in IE9 it prevents the swfs mousedown event from firing..I'm struggling to understand how swf events fit in with DOM (presumably they continue to bubble up from the object element?) and why a click event on a div would affect a childs swf click.
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Feb 14, 2012
Alright, so I've been struggling with this one since last night. When I create a new object (a new unit), and draw it to the screen (Flash does all the work there), the point at which it's first placed is considered its origin. That is, getX and getY will return the distance from that point... Why is that? Or how can I stop this?
[Code]...
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Jan 14, 2009
I have a setter and getter method , the getter method should return an array collection but it's always returning an empty array collection even when I've run trace to check on it.[code]...
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Jun 3, 2010
I've created an AS class to use as a data model, shown here:
package
{
import mx.controls.Alert;
[code].....
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Nov 9, 2009
I'm having trouble updating a property value of a custom class (SubLoader) using a getter and setter. Inside the if() statement of the main fla you can see my attempt to set the percent value. Running a trace() method before the if() statement always outputs '0' for some reason. Tracing after the if() statment outputs an actual value. I can't figure out why the percent property always traces as '0' before the if statement even though I am updating it with each progress event.
[Code]...
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Nov 15, 2009
I'm finally reading up on commenting code with ASDoc (http:url]....) but the way ASDoc is set up doesn't seem to agree with the way I write my getter/setters.Here is how I write them:
Code:
//I want to add the ASDoc tags here, before this chunk of code
private var _enabled:Boolean = true;
public function get enabled():Boolean[code]...
if I ad the tags where I want them, if I understand correctly, they will comment the private variable instead. Bummer.So, either I change the coding style I have been using for the past three years, or insert the tags inside of my code, making it ugly and less structured. I'm leaning towards option A.how do YOU write your getter/setters so they are ASDoc friendly?
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Dec 7, 2009
I frequently find myself wanting more granular control of the width/height properties. Consider either of the following cases:
- The DisplayObject is clipped with DisplayObject.mask, but Flash reports unmasked width.
- An image is displayed with a transform cage drawn over it. The width of the cage shouldn't be calculated when determining the DisplayObject's width.
The naive way to solve this problem is to override the width getter of the DisplayObject in question. The problem is that the core implementation of DisplayObject.width is written in native code. If after overriding the width getter, I call overridenObject.width, I get what I want; however, if I call overriddenObject.parent.width, DisplayObject.width ignores my override and calculates the dimensions based on its own internal display list representation.
Does anyone know of a technique to limit which children are considered when calculating width without having to override every parent's width getter? I've tried overriding width, getRect, getBounds, and scrollRect, but none of them seem to be referenced by DisplayObject.width's native implementation.
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Dec 29, 2009
Anyone know a workaround to make static getter/setters?
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Jun 27, 2011
I found this snippet of code when I walked through a Flex3.6 project:
[Bindable(event='currentPageChanged')]
public function get currentPage ():int {
return this._currentPage;
[code].....
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Mar 22, 2012
I seem to have run into a situation where when I push a value to an array held within a singleton via a getter/setter , Flash seem so access the getter over the setter method. Within my command/controller (I am using RobotLegs)
override public function execute():void {
// various line of code here
//Place screenshot image into an array from model for later reference.
model.unitScreenshots.push(screenShot); // screenshot is just a Bitmap object
}
The getter and setter within my model e.g. robot legs singleton
public function get unitScreenshots():Array {
return _unitScreenshots;
} public function set unitScreenshots(value:Array):void {
_unitScreenshots = value;
}
When I set a break point on both the getter and setter, only the getter method is being called, why? I would think that a push value on the array would trigger the setter, not the getter.
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May 25, 2011
I've found two very strange pieces of code in PureMVC's documentation:
[Code]....
(found in Best Practices [English], bottom of page 38 and top of page 39) I've always thought that getters must not accept a parameter (and FDT indeed tells me that "Parameters for getters are not allowed"), so I wonder what's going on here. Is that just an unfortunate typo (meant to be simply a normal function without the "get") or some hidden feature/voodoo?
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Oct 11, 2011
I'm trying to create a property that can be set by extending classed and read publicly.I couldn't think of a good naming convention for a protected property with a public getter, so I tried to do this:
public function get name():String{ return _name; }
protected function set name(string:String):void
{[code]......
However I get the error (when trying to set name in an extending class): 1178: Attempted access of inaccessible property name through a
reference with static type testing:TestComponent.1059: Property is read-only.
If I change the setter to public, it works fine.
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Feb 19, 2012
I recently completed a tic-tac-toe game in AS3, using some simple function-based code I had written in C many years ago.Now I'm on a quest to do it the "right way" using OOP techniques and best practices.Everything is now divided into neat little packages, it looks pretty, and the last part of my journey is to get all the little buggers to communicate with each other.I want to move the code which holds the game state from my main to it's own class in com.okaygraphics.model.GameState.The problem is nearly every other package gets and sets these game state properties.I'm trying to figure out the simplest way to encapsulate this stuff, while still allowing my other classes to access it.
1) Do I need a constructor? I mean, my program will never have more than one GameState. If I should call my getters/setters as instance methods, how do I get each other class to reference the SAME instance from their respective packages?
2) Do I even need getters and setters? Perhaps the class could just have 3 public properties? If so, how would I acheive the proper scope with regard to my other classes?
3) Should I assign everything to the class itself using the static keyword? If so, how would I implement and use those static methods?
4) Is this a mistake? Did I totally just program myself into a corner?
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Jun 28, 2009
i dont get the advantages of using getter and setter instead of setting the var public.
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Apr 6, 2009
I am currently making a class called TiltVideo that extends BasicView (papervision3d).
BasicView has a getter function that returns a camera that I need to access.
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Mar 11, 2010
If I've got a getter method, say a(), that returns the private variable _a. Obviously from outside the class I call instanceOfClass.a. But from inside the class, should I use the getter or directly _a? Suppose I'm writing a method that uses _a: should I use _a or a? var b = a; or var b = _a? Maybe for performance reasons it's better to directly access _a? Or since there's a getter a(), it's a good practice using always and only the getter?
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Mar 17, 2010
I have a .as file with class Main which contains:
Code:
public function set Set_AnimationFile(FileName:String):void
{
this.FileName=FileName;
[Code]....
How do i access these functions from my timeline script?
I have tried
[Code].....
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Nov 20, 2010
I have a document class .as file and I'm trying to communicate an object to another class with a getter. But it's nested inside another movie clip. The compiler says the movie clip it's nested in is undefined. Also, the moviecllip it's nested in is on the stage, dragged manually from the FLA LIbrary and has the instance name, gamelevel1 in the instance name box. I referred to it when I put the _player movie clip, which I'm trying to communicate with the getter, on the stage via and addChild method. Anyway here's the friggin' document class script:
package {
import flash.display.MovieClip;
import flash.events.Event;
import flash.display.Bitmap;
import flash.display.BitmapData;
[code]....
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Oct 23, 2009
I have written a class, which is basically a textfield for forms. It will eventually have several validation modes built into it too, which will be set by setting a property of the object.anyway, my problem. Basically my setters are empty if the movie is used as a loaded swf within another movie.I have an Event listener within the class listening for the Event.ACTIVATE event (still not sure exactly what this does...) though i do know that i need this in place for the setters/getters to work.If i create objects from my class, set some properties everything is spot on, though the moment i load this working movie into another movie the Event.ACTIVATE does not fire.[code]Now, if i run this movie its perfect - everything works as it should, right down to the validation.however, this movie is to be used within another movie. When i load this movie into a parent movie my fields aren't added to the movie.
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Nov 20, 2009
I'm trying to make a class that extends the Sprite, have some private properties attached to it and be able to read and write those properties using getters and setters. Simple... but the compiler throw this error "Access of possibly undefined property speed through a reference with static type flash.display:Sprite."It works if I set my class to extend the MovieClip object.Could someone explain me the logic behind this? why I can't use getter and setters with a Sprite?Here is a sample code:
package {
import flash.display.Sprite;
public class Vehicle extends Sprite{
[code].....
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Aug 26, 2010
Getter functions allow obj.meth syntax instead of obj.meth(), I'd like to create an anonymous one of these to return from another function. function get ():Object { } is invalid syntax. I don't suppose Flex offers an easy way to get this functionality, if it's even possible?
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