I'm new at as3, maybe thats the reason why i don't understand, why the setInterval causes an error.
<mx:Script>
<![CDATA[
import flash.utils.setInterval;
import mx.controls.Alert;
[Bindable]
public var MyInt:int = 500;
setInterval(function():void{ ++MyInt; },1000);
]]>
</mx:Script>
I have a label where the value of MyInt gets visible, the bind works perfect, i've tested it several ways, and i i create a button it grows the number, but if i use the setInterval function i get an error: Access of undefined property myInt.
Why? What does cause this? Please explain it, so I can avoid errors like this. Thanks
I don't know much about Flex, but I think the problem is that this code:
setInterval(function():void{ ++MyInt; },1000);
Is run like if it was placed in a class definition, outside any function. That makes the code a static initializer. That is, it's run in a static context, which means it has no access to any instance, since no instance has yet been created when the code runs.
This seems to prove it:
public static var MyInt:int = 500;
setInterval(function():void { ++MyInt; trace(MyInt); },1000);
With static, the code works fine.
You probably don't want MyInt to be static, though. So you should put the setInterval call within an instance method. Assuming init is called from the mx:Application initialize callback, this should work fine:
[Bindable]
public var MyInt:int = 500;
private function init():void {
setInterval(function():void { ++MyInt; trace(MyInt); },1000);
}
Related
In Flex 3 I have a SWFLoader:
<mx:SWFLoader id="player" source="http://youtube.com/v/..." />
and after some time I invoke player.unloadAndStop(). And I always get this error:
ReferenceError: Error #1056: Cannot create property __tweenLite_mc on _swftest_mx_managers_SystemManager.
What does it mean and how to avoid this?
UPD: AIR 2 doesn't have this problem
Maybe try the Loader class? I'm not sure if it will help but I do all my loading via ActionScript. Generally speaking, I do "heavyWeight" programming/logic/cotrol stuff in ActionScript and leave Flex for more simplistic layout code. That is, flex puts things in place and actionscript controls it all. When loading clips in our Flex 3 project, I have control code along the lines of:
import flash.display.Loader;
private var loader:Loader;
public function init() {
loader = new Loader();
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, loadFailed);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadCompleted);
}
with calls to things like:
//here, pop returns a string like "/path/to/movie.swf"
loader.load(new URLRequest(clipsToPlay.pop()));
...
loader.unload();
contained in functions like:
private function loadNextClip():void {
if(clipsToPlay.length == 0) {
dispatchEvent(new PlayBackCompleteEvent(PlaybackCompleteEvent.ALL));
return;
}
loader.load(new URLRequest(clipsToPlay.pop()));
}
private function loadCompleted(event:Event):void {
currentClip = event.target.content as MovieClip;
loader.unload();
displayClip();
}
private function displayClip():void {
applyEffects();
currentClip.addEventListener(Event.ENTER_FRAME, monitorForCompletion);
addChild(currentClip);
}
I'm not sure if Loader can be used instead of SWFLoader but if so I hope that helps you or someone else, in some way...
EDIT:
I just looked it up and mx.controls.SWFLoader and flash.display.Loader have very similar functionality. I'd try using Loader, as prescribed above, and see if it fixes the problem. You could probably initialize the loader via MXML, too, but I wouldn't recommend it since it's not a visual component, I think it's better to let MXML handle visual things while ActionScript handles logical things.
I load an SWF with SWFLoader. Within the loaded .SWF, this.parentApplication is returning NULL. Been searching the internet for eight hours.
code listing as requested:
<?xml version="1.0"?>
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
initialize= "Init();"
visible="false"
>
<mx:Script>
<![CDATA[
import flextrace.Dumper;
private var txt_event:TextEvent = new TextEvent(TextEvent.LINK,false,false,"next.xml");
private var timer:Timer = new Timer(10000);
private function Init():void {
timer.addEventListener(TimerEvent.TIMER,timer_handlr);
timer.start();
}
private function timer_handlr(event:Event) {
Dumper.info("timer_handlr");
if (this.parentApplication == null)
Dumper.info("null");
parentApplication.dispatchEvent(new TextEvent(TextEvent.LINK,false,false,"next.xml"));
}
]]>
</mx:Script>
</mx:Application>
I just was looking through Flex docs and saw an answer on your question, if I understood you correctly:
The parentApplication property of an Application object is never itself; it is either the Application object into which it was loaded, or it is null (for the Application object).
Since, your calling it from the application, it should be null.
Just a quick link for you about accessing nested applications (I haven't tested the solution yet tho, but still, may give you some ideas): Nesting Flex applications - weird issues..
Hope, this would help :)
RYAN GUILL: I tried your suggestion - didn't work. I replaced the dispatchEvent call in the code from the OP with the following: this.dispatchEvent(new TextEvent(TextEvent.LINK,true,false,"next.xml")); Were you saying that this should have triggered the Parent application's event handler for TextEvent.LINK? It didn't work.
Try FlexGlobals.topLevelApplication?
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/core/FlexGlobals.html?filter_flex=4.1&filter_flashplayer=10.1&filter_air=2
I have several mxml components in an app, all of which need the same variable called genericX. I've included that variable in the main mxml and made it public
[Bindable] public var genericX:Number = 102;
but I still can't access it from other mxml components. If I try to do this for example, it doesn't recognize the variable.
<s:Button x="{genericX}" label="Click" />
There's also a filthy solution that works but isn't nice. You can create a static variable against the application class. For example:
[Bindable] public static var genericX : Object
You can access that from anywhere like this:
MyApplicationName.genericX
It ain't pretty, but it does work :)
simon
You cannot access in this way. There is something called Events in Flex and you need to pass this variable in a MXML file to another using eventDispatcher.
For example
[Bindable] public var genericX:Number = 102;
private function init():void {
var evt:NewCustomEvent = new CustomEvent(CustomEvent.SENDDATA);
evt.genericaValue = genericX
dispatchEvent(evt);
}
Now you need to get into the MXML component where you want to recieve this Event and using addEventListner() to recieve this event and the corresponding variable.
Then finally Inject it into your button.
You should be able to access any global variables with:
Flex 3:
var app:Application = mx.core.Application.application as Application;
Flex 4(looks like what you're using):
var app:Object = FlexGlobals.topLevelApplication;
And then:
<s:Button x="{app.genericX}" label="Click" />
x="{parentApplication.genericX}"
Here is an example for sharing variables between MXML components by declaring them public in the main application.
In my flex app I have a public bindable property.
I want it so that every time the value of that property changes, a function gets triggered.
I tried using ChangeWatchers, but it seems those only apply to built-in components like a text box change.
I would like to do that same behavior with a property that changes at runtime.
One option is to use BindingUtils.bindSetter (which incidentally returns a ChangeWatcher):
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="this_creationComplete()">
<mx:Script>
<![CDATA[
import mx.binding.utils.BindingUtils;
import mx.binding.utils.ChangeWatcher;
[Bindable]
public var myValue:int = 0;
private function this_creationComplete():void
{
var cw:ChangeWatcher = BindingUtils.bindSetter(myValueChanged, this, "myValue");
}
private function setValue():void
{
myValue = getTimer();
}
private function myValueChanged(o:Object):void
{
trace("myValue: " + myValue.toString());
// You can also use o.toString() -- the new value will be passed into the function
}
]]>
</mx:Script>
<mx:Button label="Click Me" click="setValue()" />
</mx:Application>
Here, myValueChanged gets called whenever the myValue property changes. There are other ways, of course, but I often use this approach with good results. Hope it helps! Post back with questions and I'll keep an eye out.
Look into BindUtils class as back2dos suggests.
And, also, you can set the name of the event that will be triggered when a change is done to a property (default is propertyChange) like this:
[Bindable("change")]
var myProperty : SomeClass;
That is if ChangeWatchers adds listeners for the change event instead of propertyChange event. Which would be kind of weird, but not impossible with all the mishaps of the flex SDKs.
But again, I think BindUtils class should do the trick for you.
Use the class ObjectProxy or its subclass and wrap up the class that has a property you need to watch. In my example, I'm calling a func if someone is changing the property salary giving it a value of more than 55000 in an object Person:
package com.farata
{
import mx.utils.ObjectProxy;
import flash.utils.*;
use namespace flash_proxy;
public dynamic class MyPersonProxy extends ObjectProxy
{
// The object to wrap up
private var person:Person;
public function MyPersonProxy(item:Person){
super(item);
person=item;
}
flash_proxy override function setProperty(name:*, value:*):void {
if ( name == 'salary'&& value>55000) {
// add a new property to this instance of the
// class Person, which can be used in the calculations
// of the total compensation
setProperty("pension", 0.02);
}
super.setProperty(name, value);
}
}
}
well, the easiest way is to listen to PropertyChangeEvent.PROPERTY_CHANGE ... if you declare a property bindable, then mxmlc generates the code to dispatch this event ... if you let the compiler keep the generated ActionScript, then you'll see it ...
other than that, you might want to have a look at BindingUtils ...
Is there a way I can programmatically determine the filename of the .swf my class is running in?
Thanks!
Stage has a loaderInfo property, which contains a url property that has the information you're looking for. You can get the stage property from any DisplayObject in Flex.
trace(stage.loaderInfo.url);
Just a helpful note: If you load one SWF into another, the loaded (inner) SWF will return an erroneous result if you use loaderInfo.url to try to get the filename. For instance, something like:
Path/To/Outer.swf/[[DYNAMIC]]/1
Instead of:
Path/To/Inner.swf
Beware!
That said, here is the code I use to get the current SWF name:
function SWFName(symbol:DisplayObject):String
{
var swfName:String;
swfName = symbol.loaderInfo.url;
swfName = swfName.slice(swfName.lastIndexOf("/") + 1); // Extract the filename from the url
swfName = swfName.slice(0, -4); // Remove the ".swf" file extension
swfName = new URLVariables("path=" + swfName).path; // this is a hack to decode URL-encoded values
return swfName;
}
Not from within flash, afaik. What do you need it for? There might be a better way to do it.
You can use loaderInfo.loaderURL to get the full path and name of you swf
Example of a class:
public class Main extends Sprite {
private function init():void {
removeEventListener(Event.COMPLETE, init);
var myUrl:String=loaderInfo.loaderURL;
var tmp:Array=myUrl.split("/");
var myName:String=tmp[tmp.length-1].split(".swf")[0];
}
public function Main() {
super();
if (stage)
init();
else
addEventListener(Event.COMPLETE, init, false, 0, true);
}
}
Things have changed a bit in more recent versions so I'll give an answer for Adobe Flash Builder 4.6 (geared towards Flash in browser, but you get the idea).
<s:Application ... applicationComplete="alertSwfUrl()">
<fx:Script>
<![CDATA[
import mx.core.FlexGlobals;
private function alertSwfUrl():void {
var a:LoaderInfo = FlexGlobals.topLevelApplication.stage.loaderInfo;
ExternalInterface.call('alert', a.url);
}
]]>
</fx:Script>
</s:Application
Check out the LoaderInfo docs to figure out how to use the loaderInfo object associated with the stage.