Flex :: What Keeps Locally Scoped Objects Alive When Listeners Are Registered
Jul 5, 2011
I see this type of apparent magic in all sorts of AS3 code, but here is a reduced example:
[Code]...
As indicated in the code comment, the loader variable should fall out of scope after the URLLoaderExample constructor. However... it still seems to be kept alive (not garbage collected) somewhere since the onComplete listener/handler is able to receive it cleanly. Where is the magic/hidden/global reference to loader that keeps it alive so that it can complete it's load operation, and then be handed to the onComplete listener/callback? Can this reference be seen somewhere?
To help with context... as a similar example, I know that the loader instance will have the onComplete listener registered. I also know I need to be careful to use removeEventListener at all times (?) to avoid potential memory leaks resulting from stranded listeners. What concerns me is that I don't understand where the magic loader reference is and whether (or when) I need to clean that up.
Im trying to create a pdf in high resolution in 300dpi with pdf alive for flex, i used this code: var image:ImageSnapshot = ImageSnapshot.captureImage(page[i], 300, new JPEGEncoder()); but i create the pages with a loop for(), and this makes that my web aplication crashed, beacause it spend a lot of time to create the PDF. Exist some way to create this process in the background but dont want the .swf to freeze while the number crunching happens, or another way to create pdf in high resolution(300dpi) with flex.
My flex application generates individual pdf documents based on individual selection criterion,but i need to merge those generated pdfs or is it possible to store individual pdfs temporarily then merge those into single pdf?
Is there a way to directly print using alive pdf (by passing the step where it saves the datagrid in pdf). Right now I am using Alive Pdf for generating PDF from datagrid and its doing a great job. Since flex printing by itself sucks I was wondering if I could directly print using Alive PDF?
Any standard way to keep alive the http session as long user has open the flex app in the browser? I played around with the polling mechanism of blazeds. But it had no affect on the http session.
I have a display object container and I am trying to add a paste event to it. But the event is not being registered. The documentation at liveDocs mentions that classes that derive from Interactive objects can dispatch paste event but I dont understand why it wouldnt work for me.
I'm having problems with Shared Objects. They seem to work on my machine but when I put them on a server they're not working anymore.Basically I have a page with a video player and I only want the video to play when the user visits the page for the first time.This is the code:
PHP Code: var beenVisited:Boolean=false;var shared:SharedObject=SharedObject.getLocal("visited");if (shared.data.visits==undefined) shared.data.visits = 1; beenVisited=fa
Say my flash project has an object A. In object A is an event and it's corresponding listener B. How do I get listener and event B to function in my flash project? I remember it something to do about "focus", right? Or am I completely off target, ha?
I was just wondering--and it's probably an obvious question really--if I make an object null and that object had one or more event listeners registered, are the listeners removed?
for example:
Actionscript Code:
object.addEventListener(Event.SOME_EVENT,callBack); function callBack(evt:Event):void { object = null;
[Code].....
In this case have I removed 'object''s listener when I made the object null?
I'm currently working on a nav bar but I've run into a questionable situation. There are several links in the menu, and for each i'd like a mouse event on over and on out. Do I have to specify both of these events for each link, or is there an easier way to do it that I don't know about? Can you apply event listeners to multiple objects/functions?
I have a parent SWF (Parent) that handles user navigation between multiple children SWFs (Child_1, Child_2, Child_3). How do I add event listeners to the navigation buttons on the children SWFs so that the user can move laterally between Child_1, Child_2 and Child_3? I can think of two options but can't get either one to work:
1) The parent SWF sets up the event listeners when it loads a child. So, I use a loader on Parent to load Child_1 and in Parent add eventlisteners to Child_1.myNavigationform.myButton.
The problem here is that the Parent is only handing the loader instance and I can't think of how it would drill down to the individual objects within Child_1.
2) Child_1 adds the event listeners to its own objects. This just reverses the problem. Child_1 has no problem accessing its own buttons but when a user clicks them it has no way of accessing methods on parent so that Child_2 can be loaded.
I am creating a site with lots of big scrollable text-boxes in it. Each text-box object contained some text, and two buttons to scroll up/down with. The scroll buttons each had an event listener so the text moved when you clicked them.
These text-boxes were stacked on-top of each other with all except one having an alpha of 0. If I wanted to change which text-box is active I move it to the front and call a small TweenLite animation.
To the left (outside of the text-box objects) I have an object similar to a menu. It also has about 12 or so event-listeners (one for every button).
This turns out cause A LOT of lag an it's very troublesome for my laptop to run it. reduce the number of event-listeners on the stage and also the amount of text-boxes.
What I was thinking was to add the text-boxes using AS so I only have 1 on the stage at a time but I couldn't figure out how to do it. I also thought it might be better to just use 1 big event-listeners and from mouseX and mouseY decide which button the user is trying to push.
I'm trying to think of the best way to add event listeners(mouse events) to an invisible object which is quite large. A straight forward way I can think of is probably setting the object's alphy property to 0. However since that object is very large, it will probably have a huge impact in performance. Setting invisible to flash however, will stop it listening to events.
e.g. I have a massive area 4000x4000, but I only want the 2000x2000 area to listen to events.
Other methods I can think of is to have the smaller area in the layer below the big area, covering it from view, though I'm not sure if the lower layer can pick up events? another way is maybe just have the big area listen to events, but in the handler I'll write some code to check if its within the boundary of the smaller area.
I have created a number of Movieclips as part of my Navbar such as About Us, Contact etc. I'm using setInterval to send them to a function that springs them open one after another using the tween class. The they are dynamically generated and positioned using the following code, however when I want to use them as buttons by using onRollOver or onRelease they act like I'm not scoping them correctly. In other words the cursor does not change into a hand when over them. This is a setInterval issue as if I have them open just using attachMovie, the scoping works just fine.
The actual code is as follows: function aboutUs () { var mcAboutUs:MovieClip = this.attachMovie("mcAboutUs", "aboutUs_mc", 20, {_x:197, _y:520}); var x_elasticTween:Tween = new Tween (aboutUs_mc,"_xscale",Elastic.easeOut,0,100,1,true ); var y_elasticTween:Tween = new Tween (aboutUs_mc,"_yscale",Elastic.easeOut,0,100,1,true ); clearInterval(_global.intervalID1); } function setIntervals() { _global.intervalID1 = setInterval(this, "aboutUs", 1000);
There are more in here, each going to its own function to attachMovie and Tween them. This all works fine.
setIntervals(); this.aboutUs_mc.onRelease = function() { OnRelease is suppose to activate another function that generates the "About Us" page but nothing happens as if the instance is not been scoped. page_aboutUs(); }
I want to make a little game. What I need is to add event listeners to all of Tank objects inside the Battlefield instance. I just can seem to figure out how.
it doesn't seem like you can use locally scoped vars within a static block?For example I was thinking I could do:
Code: public static var standardAgeRange:ArrayCollection = new ArrayCollection(); //static block {
[code]....
but apparently I have to first declare _n as a static var of my class (or as a static var within the block itself) in order to use it within the static block.needed to do...
private static var _n:int = 2;
then in the static block:
for (_n=2; _n<120; _n++)
In Java I'm able to use locally scoped variables within the static block. I know this isn't Java, just wondering if I'm missing something fundamental. (I couldn't find a lot of documentation online concerning static blocks in AS.)
I want a user running a Flash game on his machine (not from a server) to be able to save some game data locally.From what I've read, there still isn't any way to do this, but I thought I'd throw it out there in case anyone knows a sneaky xml or php work around.
printableInvoice.addEventListener(batchGenerated, printableInvoice_batchGeneratedHandler);Results in this error: 1120: Access of undefined property batchGenerated. I have tried it as FlexEvent.batchGenerated and FlashEvent.batchGenerated.
The MetaData and function that dispatches the even in the component printableInvoice is all right. It I instantiate printableInvoice as an mxml component instead of via action-script it well let put a tag into the mxml line: batchGenerated="someFunction()
I have 3 frames each with a movie clip called map_mc. Each different map_mc have different objects that call the CollisionDetect class. Heres whats happening. objects from frame 1 will start freaking out when I goto frame 2. How do I remove only the event listeners from objects only on frame 1?
I have been trying this.currentFrame but the problem is that all the objects are inside map_mc on the first frame so no matter what it will always be 1. On the other hand MovieClip(root).currentFrame will always give me the current frame but wont tell me what the objects frame is relative to the stage.What I want to do is have something to this effect:MovieClip(root).this.currentFrame would output that this object is on frame 1 and MovieClip(root).currentFrame will tell me that the stage is on frame 2 so I can remove the listeners accordingly.
I've made a parallax scroller consisting of three layers (actually each layer is a movieclip). On the bottom layer I have attached some sprites which I want to be clickable. The problem is that objects which are on the middle and front layer are "blocking" the sprites so they can't be clicked. I've googled for nested listeners but haven't found a solution yet.
I have one xml link. that link have collections of images(apx 1000 images). when i flex applications start at the time load all images in locally. then when i need that images then use it. How i do this... give me some links and logic.
What would be the better approach for using the Sockets in AS3.
1st) open one connection and keep it alive until the site unloads?
2nd) open a connection, use it, and close it when done; then, open again when I need?
Considering a scenario where some users will make a constant use of the Socket, but others will almost not use it, what would be the better approach? Does an alive Socket connection use too much bandwidth? Does the action of connecting consumes more than keeping it alive?
I have a little problem with a simple URLLoader,it simply just loads the data from an url, and processes that data, nothing complicated. But, when ever i run it, it leaves the connection open. At the bottom of the browser it says:
Transfering Data From www....
The data is read sucessfully, so it should close the connection? but doesnt seem to want to do it. Is there anyway to close all open connections, or somehow remove such message?
I have page in my asp.net mvc website with a flash app on it, and the user can stay on that page for hours, but his auth cookie/session is going to expire, so I'm thinking to create a PingController and to call it using jquery $.post each 20 minutes.
I have two components in my movie,how to write out the code for the listeners.Is it possible to write one listener that listens for changes in both components or do I have to write a separate listener for each? How would this look like written out?
