ActionScript 3.0 :: Referencing Stage.stageWidth From A Class
Jan 7, 2009
I created a custom class in a .as file. I then linked this custom class with a symbol from the library in my .fla file. However, I can't reference stage.stageWidth in my custom class file. I get a null object error.
I think this happens because the custom class file is associated with a symbol on the stage and not the stage itself. For example, if I set the fla file's Document Class to the name of my custom class I can reference stage.stageWidth in the custom class. But I don't do this because I am creating multiple instances of the symbol on the stage. In order to do that properly i found I have to set the class in the properties panel of the symbol to the underlying class which then defines how each symbol behaves.
Under this type of linkage, is there a way to reference the stage width from the class? I've tried root.stage.stageWidth and parent.stage.stageWidth to no avail. I also made sure to import flash.display.* in my custom class. Below is the code for my .fla file and my .as file. In the .as file you'll see the line "x = Math.random() * stage.stageWidth;". This is the line giving me problems. I could hard code it, as I do for the y variable on the next line, but I'd prefer not to in order to keep the code flexible.
[Code]....
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Jun 3, 2011
I have a main.swf and a slider.swf. I load the slider.swf into main.swf. In my slider.swf I have this code which adds an image to the stage from the Library:
[Code]...
I assume it has to do with the stage.stageWidth. Is there a another way to reference the stage. If I load the the image externally via a loader I can use the stage.stage Width.
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Jul 1, 2010
can you tell me a simple and clean way to pass the dimension of the stage to another class, imported in my documentclass?
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Mar 29, 2009
I made a class to create and handle a google map in my swf and everything works very well. But I want to make my layout completely liquid. To acomplish this, I need to call the stage from the class... But it doesnt seem to be so easy.
the code is bellow:
[Code]....
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Mar 17, 2009
I am building a simple ToolTip-Class. In case the cursor gets to close to the stage's border's I'd like it to flip accordingly, so it won't get cropped.
For this I'd like to compare the stage width and my mouseX and then scale and wove things accordingly.
However when I try to get stage.stageWidth from inside my package it will return null.
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Sep 3, 2009
How to access stage elements from within a class.
buttonControls.as
Code:
package {
import flash.display.Sprite;
public class buttonControls extends Sprite {
// Navigation Hover Color
var hover = "0xF1E960";
var normal = "0xFFFFFF";
public function changeColor(object, color){
[Code] .....
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Feb 14, 2009
I'm having problems referencing the stage from an external class. I've tried :
Code:
stage.addEventListener(MouseEvent.MOUSE_UP, onUp, false,0,true);
And also
Code:
MovieClip(parent).addEventListener(MouseEvent.MOUSE_DOWN, onDown, false,0,true);
But no luck. Can I not do this? I'm making a pencil class that I want to be able to reuse. I also tried "this" and while it didn't throw and error, it didn't work either.
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Dec 9, 2009
I'd like to know how I can reference root stage values from within a movieclip, or even worse, from a class. For example, I have a class called Bground.as. It does stuff, according to current stage size - so if someone were to resize the window/browser, Background updates in real time and does something fancy while it's at it. To do this "fancyness", I need stageheight and stagewidth. However, simply pointing to them does not work.
Here's the simplified ActionScript Code:
package klaseFP{
// imports
import flash.events.*;
import flash.display.*;
public class Bground extends MovieClip{
[Code] .....
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at klaseFP::Bground()
at FullScreen_03_fla::MainTimeline/frame1()
Background works as a document class, works perfectly in fact. However, if I use it as the class of a library object, error 1009 shows up. Same thing happens if I simply put the code into the timeline of the library object - stage referencing simply causes it to break. So, how do I dynamically change the values of variables in Background, according to values in the main movie/app?
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Sep 6, 2011
I have a media player that I am codging together, one that will play either videos or MP3s depending on the variables it is passed. The video player part works fine. The MP3 player controls are all actual physical MCs on the stage; each one has its own AS class file as part of the package, but there is also a lot of AS that is happening in the main FLA as well. Messy, I know, but it mostly works great.
The MC on the stage in the main FLA is properly linked to the class file via Actionscript linkage, and the control itself works. However, I am trying to make some aspects of the control respond to variables that are set within the AS on the timeline of the main FLA, and I cannot seem to pass values to the control no matter what I do.
[Code]....
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Sep 6, 2011
I have a media player that I am codging together, one that will play either videos or MP3s depending on the variables it is passed. The video player part works fine. The MP3 player controls are all actual physical MCs on the stage; each one has its own AS class file as part of the package, but there is also a lot of AS that is happening in the main FLA as well. Messy, I know, but it mostly works great.The MC on the stage in the main FLA is properly linked to the class file via Actionscript linkage, and the control itself worksHowever, I am trying to make some aspects of the control respond to variables that are set within the AS on the timeline of the main FLA, and I cannot seem to pass values to the control no matter what I do.The following variable is set in the main AS:Code:var notPlayedYet:Boolean = true;I also have some flashVars being passed in from the html, and these I can reference with no trouble from the main AS - the relevant one is:
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Dec 13, 2009
I am using SWFOBJECT to embed my flash content. I have been worried about stage.stageWidth and stage.stageHeight returning 0 in Firefox/Internet Explorer; this problem is referred to in question #21 on the SWFOBJECT FAQ [URL]..I have been told that this problem is particularly prevelant on Macs. The SWFOBJECT FAQ (question 21) indirectly suggests that this problem does not occur with static publishing. Is this correct? Is it still advisable to implement a solution to this stageWidth/stageHeight problem, even if you are using static publishing?
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Jun 18, 2010
I've been working on a project that requires lots of scaling around a center point.
I always thought that stage.stageWidth and stage.stageHeight give you the dimensions of the stage you set in the properties panel no matter what. But when I went into fullscreen mode (with scaling), both the width and the height changed to the dimensions of the screen rather than staying the dimensions I specified.
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May 17, 2011
In my AS3 code all the elements on the page are dynamically positioned depending on the current width and height of the SWF - providing it's not under a certain value, then the items are back in their original position.
When debugging in the Flash player the size all reports correctly however when run from a web browser it does not - initially.
This is my HTML & PHP code for the entire page:
HTML Code:
<?php
function hashId($fn) {
$hash=md5_file($fn);
[Code].....
But I cannot get the size to report correctly without, say, clicking a button.
It seems to me like I need to force flash to re-draw the screen, but I had no luck trying to do that.
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Oct 5, 2011
In as3 What is the difference between calling stage.width and stage.stageWidth I read somewhere that if we have nothing on stage then the value of stage.width is 0,but what happen when I have nothing on stage but loading contents dynamically on stage?I have tried this and when i have loaded content dynamically on stage then i have got
stage.width=value; // where value is dynamic number
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Sep 14, 2011
In actionscript 3 (as3) What is the difference between calling stage.width and stage.stageWidth. This was something I remember I got confused about in the past (Adobe's api docs are an artform in obfuscation
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Jan 2, 2008
What am I missing here? According to the docs:
Quote:
When the value of the scaleMode property is not set to StageScaleMode.NO_SCALE, the stageWidth property represents the width of the SWF file as set during authoring in the Document Properties dialog box. This means that the value of the stageWidth property stays constant as you resize the Flash Player window. This property cannot be set. So stick this in a new FLA
[Code]...
and the traces are of different values. According to the docs, this shouldn't be happening. What's going on? Did I miss something little?
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Jan 25, 2010
I haven't gotten a handle on coding classes and the appropriate syntax with all the "public" "private" "static" keywords, etc. Anyway, one thing I miss in AS3.0 is having "out-of-the-box" global variables and functions. I've read a lot of forums and articles about making a simple "MyGlobal" class that could hold variables and functions which could be called from the timeline as "MyGlobal.doSomething()" However, I seem to be running into a problem trying to reference "stage" from within one of the global functions... I imagine this is because "stage" is an instance property. I'm basically trying to add/remove an event listener to the stage whenever the global function "MyFunction" is called.
MyGlobal.as:
[Code].....
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Sep 2, 2009
So I'm trying to do a simple graph with rollover definitions. I have the graph on one layer in the root along with the definitions. On a hit testing MC I have the following:
var defbox:info = new info();
var mcName = this.name;
var xPos = (MovieClip(parent).stage.stageWidth)/2;
[code]....
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Oct 8, 2010
Experimenting with Flash as usual.Preloader's are always something that have caused me trouble.Here's what I typically use for a timeline based preloader in AS3:
this.addEventListener(Event.ENTER_FRAME, loading);
function loading(e:Event):void {
var total:Number = this.stage.loaderInfo.bytesTotal;[code].......
I'm really interested in a preloader that loads right across the stage however - regardless of if the stage is resized.I should imagine it'll involve implementing = Math.round(stage.stageWidth); at some point?
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Feb 18, 2012
I am trying to set masks and other component positions in relation to Stage size.AS3 CS5I trace stage.stageWidth on a 800x600 pixel stage and I get - 100My stage will scale within a Director piece.Is this a bug? Modal condition? Releated to scaling??
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May 31, 2010
I'm having issue regarding the display when using Firefox 3.5 on MAC, I can see my menu and the display is correct. The menu just position above what it supposed to be positioned. It works fine with Safari on MACOSX.My flash size is: 1440x750It looks like Firefox can't recognize stage.StageWidth and stage.StageHeight. It returns 0.Some suggest implementing was to pass in the actual width and height of movie via FlashVars. The movie uses these instead of stage.stageWidth and stage.stageHeightDoes anyone have an example of code of how to fix that issue??
public function Main()
{
addEventListener(Event.ADDED_TO_STAGE, handleOnStage, false, 0, true);
[code]....
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Sep 19, 2009
The old loaded swf issue. How can I keep the dimensions of the loaded SWF to that of its FLA, and not to the new stage where it is loading? I know there is only one stage, so i just have to hard-code this into the loaded SWF right?
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Jun 3, 2010
Working on personal full flash site and I can't really figure out how to make MC's position on Stage aligned on Firefox browser. Everything goes fine using Safari.
I have tried a method of set a timer every time it goes off (every 200 ms or so) it checks to see if stage.stageWidth > 0. If that is the case, do stop the timer and start resize on stage. However it's still not working on Firefox of MAC. :(
In my HTML code:
<link href="css/site.css" rel="stylesheet" type="text/css" />
Test Site
<script type="text/javascript">
var swf = new SWFObject("main.swf", "mymovie", "100%", "100%", "10", "#000000");
swf.addParam("allowScriptAccess", "always");
[Code]....
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Jun 27, 2011
I've decided to start re-writing my project, but this time making the use of class files rather than nesting code inside my MovieClips.
Now it's come to the "message box" that I previously wrote, and I'm having some troubles. (note: I don't really want to download a pre-built one as my message box class end up being the backbone for several custom interfaces).The problem is that I cannot, for the life of me, figure out why my message box class cannot access "stage.stageWidth", "stage.stageHeight", "MovieClip(root).currentWidth", etc.
This is the code for the working "messageBox.as":
ActionScript Code:
package com.components{
import flash.display.Shape;
import flash.display.MovieClip;
[code]....
I've tried several variations of creating the movie clip, but to no avail. I've tried like creating a global movie clip variable and that attatching the movieclip to it in this function, the same with a display object, creating a function variable and doing both of the above, etc.I just cannot figure it out! All of my other classes are working just fine!
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Jul 19, 2010
I'm after a way to implement a similar style of navigation as the blue strip that enters from the right hand side of the stage on this website:
[URL]
I'm fairly sure it will revolve around the use of a stage.stageWidth listener on an mc and then subtracting a certain amount to ensure it doesn't span the entire width..
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Jan 11, 2012
I am creating a android app using adobe air (flex sdk 4.6.0) and i am trying to find out what the width of the phone screen is in pixels. So I am fallowing the tutorial here but when ever i copy the code into my project and click run it always gives me this error "TypeError: Error #1009: Cannot access a property or method of a null object reference." and goes to the line that has stage.stageWidth I have also tried stage.width but it does the same thing. So does stage.stageWidth no longer work or how do you tell the screen size of the tablet or phone? Was it replaced with something else for phones? I am trying to get the information so i can center images in the center of the screen using action script.[code]
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Mar 12, 2012
Does the value of Stage.stageWidth or Stage.stageHeight change as per the screen-resolution, monitor-size, browser etc ?
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Feb 3, 2009
Ok, this is one of those walls that I know once I can jump over it, I will be a much happier developer again.
I've done tons of reading, and think I have a firm understanding that the general consensus is that if you want to reference something, it needs to be added to the display list, using addChild().
I hate to be defiant, but what if I don't want to?
Or at the very least, what if I want to add a movieclip class to the stage using addChild, and then reference objects inside it?
It is much easier this way than what most people recommend - adding 15 objects via addChild, then setting the x and y for the, etc.
That said, I'm all about using classes and using as3 the way it was meant to be used. So what this is, is a best practices question I guess.
HERE ARE THE STEPS I'M TRYING:
- Create new flash document
- Draw graphic symbol bg, with text field over it, select them, convert to movieclip symbol, and export class name "box", then delete it from stage
- Add document class .as file, which simply adds that class "box" from the library, to the display list using a simple addChild()
- Set a name for that box using box.name = "test" let's say
- Do a simple trace like the following - "getChildByName('test').textFieldName" - it shows up great
- So then, I'll now try to set the text by doing this - getChildByName('test').textFieldName.text = "yo";
That last line above, is what doesn't work. I know I'm referencing wrong, but how would a pro as3 developer, reference something on the stage within a movieclip class, from the document class?
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Mar 11, 2011
I need to increment an integer variable in a function within the document class upon transpiring event in another class. I can't seem to figure out how to call the function and reference the variable.
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Jun 19, 2010
I have an enemy on the stage that reads whether it's being hit by a bullet by a hittest. There's a for loop inside the enemy's class that looks for all the bullets and names the bullet that's hitting it "hitBullet". What I'd like to do have an easy way of seeing what type of bullet is hitting the enemy. I'm basically looking for something like
if (hitBullet == RegBullet) {
//do regular bullet dying
}else if (hitBullet == ClusterBullet) {
//do clusterbullet dying
}
, where RegBullet and ClusterBullet are classes. But I have no idea what hitBullet is equal to when a ClusterBullet or RegBullet hits it. I traced hitBullet to see what it would return and got "[object ClusterBullet]", but I'm not sure what that would be in the actual code.
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