Re: [flexcoders] Re: Thoughts on Flash by Steve Jobs
On 01/05/2010, at 1:54 PM, Amy wrote: It may be low, but there's a certain amount of logic to it, considering when Steve Jobs was out, he was given a liver transplant. In ancient times, the liver was considered to be the seat of anger. MPO is that there's been a lot of angry behavior coming out of Apple lately, and not just aimed at Adobe. I'd say the anger has almost uniformly been directed *at* Apple (and Jobs). Re-read his articlethere are no angry words there. People who don't like Apple tend to see everything Apple does as an attack on them and their choices, but it's like the egocentric person who thinks everything is about them - Apple can be acting in their own interests and not in yours *without* wishing *you* harm. I don't see Apple lining people up and forcing them to buy iPods, iPads, iPhones or iMacs, so, y'know, people can and will vote with their feet if Apple does stuff they don't like. For me, not supporting Flash on iP*s doesn't outweigh the other good things about the platform and devices, and I like the new emphasis on supporting web standards. Guy
Re: [flexcoders] Re: XMLListCollection DataGrid Performance vs Any Other DataProvider Type
Maybe I wasn’t clear. You will still be using ArrayCollection, but the items
in the collection will be ValueObjects or data class instances instead of
Objects or XML nodes. Properly written ValueObjects are faster than Objects
and much faster than XML nodes for each property you access. If you do it
often enough it pays off the conversion time, and collection item properties
are accessed during scrolling so usually it pays off if folks are going to surf
the data.
It’s pretty simple. If you got XML like this:
Var xml:XML = employees
employee id=”12345”
firstNameAlex/firstName
lastNameHarui/lastName
/employee
employee id=”23456”
firstNameGordon/firstName
lastNameSmith/lastName
/employee
/employees
You get the list of employees:
Var empList:XMLList = xml.employee;
Now if you just do:
Var n:int = empList.length();
Var arr:Array = new Array();
For (var I = 0; I n; i++)
{
arr[i] = empList[i];
}
Then each of the items in the collection is XML and access to the properties
are significantly slower and scrolling performance may suffer.
If you convert to objects:
For (var I = 0; I n; i++)
{
var emp:XML = empList[i];
var o:Object = new Object();
o.firstName = emp.firstName.toString();
o.lastName = emp.lastName.toString();
o.id = e...@id.tostring();
arr[i] = o;
}
There is a cost to converting the data, but access to properties is much faster
and you’ll probably feel it in scrolling.
The recommended practice is to make a data class or ValueObject
Public class Employee
{
public var id:String;
public var firstName:String
public var lastName:String;
}
For (var I = 0; I n; i++)
{
var emp:XML = empList[i];
var o:Employee = new Employee();
o.firstName = emp.firstName.toString();
o.lastName = emp.lastName.toString();
o.id = e...@id.tostring();
arr[i] = o;
}
Access to data will be the fastest although you may not notice over plain
Object, but the data is now strongly-typed so the compiler will catch you if
you type the property name incorrectly. And someday if you convert to
RemoteObject/AMF, you’ll already have a data class ready to go.
On 4/30/10 10:54 PM, Angelo Anolin angelo_ano...@yahoo.com wrote:
I know a bit of converting my XML data into array collection which I can use as
DP for my data-based controls.
I want to get some good examples on what Alex posted to convert the
xmllistcollection to class instances.
I was just thinking cause, xmllistcollection can be definitely bound as a
dataprovider to a flex control but if I am going to convert the
xmllistcollection to a class instance and use that class as dataprovider for
the control, then the overhead may be too much to actually ponder on?
From: jamesfin james.alan.finni...@gmail.com
To: flexcoders@yahoogroups.com
Sent: Fri, 30 April, 2010 7:46:57
Subject: [flexcoders] Re: XMLListCollection DataGrid Performance vs Any Other
DataProvider Type
This code will convert for you...
You need to replace the xmllist.myxmldata with your own xml structure names.
private function convertXmlToArrayCo llection( myxml:String ):ArrayCollection
{
var xml:XMLDocument = new XMLDocument( myxml );
var decoder:SimpleXMLDe coder = new SimpleXMLDecoder( );
var data:Object = decoder.decodeXML( xml );
var array:Array = ArrayUtil.toArray( data.xmllist. myxmldata) ;
return new ArrayCollection( array );
}
A quick follow-up after I made this tweak to use objects vs xml.
In my case, performance increased by about 20% when scrolling on a 24 monitor
browser full-size by reducing the number of renderers from 10 to 3. I then
pre-translated the original xml data in the conversion so that I didn't need to
do it with a label function.
Performance is now acceptable in full-screen (24) mode.
Bottom-line, avoid renderers. Label functions are better but are still taxing
on the performance if there is a bunch of computing going on in those
functions. Pre-render data when converting from xml to objects.
--- In flexcod...@yahoogro ups.com mailto:flexcoders%40yahoogroups.com , Alex
Harui aha...@... wrote:
I don't know of any links off-hand. I would simply create a class with the
set of properties you are interested in, then take the XML and parse it into
instances of that class.
You can try to get XMLDecoder to do it, but sometimes it is more efficient
just to write your own converter.
On 4/29/10 7:50 PM, Angelo Anolin angelo_anolin@ ... wrote:
Any link to show us some samples?
My data is coming from a .NET backend and most of it are in XML format and
parsed into XMLListCollection.
Would appreciate some more info on this.
THanks.
_ _ __
From: Alex Harui aha...@...
To: flexcod...@yahoogro ups.com mailto:flexcoders%40yahoogroups.com
flexcod...@yahoogro ups.com
[flexcoders] httpService useProxy
I have an app which accesses quite a few php urls returning XML that sit in the same directory and domain as the main app. I use a common prefix to the file paths yet for some reason I have flex moaning to me about setting useProxy to false yet it seems to be false already - much time with the debugger and explicit setting makes me think that is certainly the case. Is it some form of voodo? - never really had this kind of problem when using URLLoader and the like. This is Flex 3.0 (with FB 3.0) and I have not moved forward to later versions of the SDK. Paul
[flexcoders] Re: Thoughts on Flash by Steve Jobs
Hi Jeff, We are talking about Flex, not about the Creative Suite, right? What about Flex Builder for Linux? Stability of the platform? Performance issues? Debugging tools? Bugs fixed? AIR? Personally I don't understand the value of AIR as soon as can't talk to the hardware. Walter, what's the point? Offline application for ebay? Why do you need to do the online shopping offline? This is an oxymoron. PS I am currently profiling an idling application which takes 30-60% of CPU time with no user code executed whatsoever ( according to the Profiler which sucks big time). Please don't tell me that Flex/Flash is perfect and does not need the improvements. The memory performance issues are the highest priorities for our project. I came from the hardcore C++ land and I know how to make efficient robust applications. With Flash/Flex - it's a game with no determined approach. Although, I had a look at Flex 4 and I liked i. But still, 300 000 lines app conversion is a separate project. Cheers, Dmitri. --- In flexcoders@yahoogroups.com, Battershall, Jeff jeff.battersh...@... wrote: Mike, Adobe get cracking - are you kidding me They've just released a slew of new products in the last two months; they're nearly done on FP 10.1, Air 2.0, and forged an important alliance with Google. What more do you want them to do before you can say they've gotten cracking? Jeff -Original Message- From: flexcoders@yahoogroups.com [mailto:flexcod...@yahoogroups.com] On Behalf Of mitek17 Sent: Friday, April 30, 2010 12:33 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] Re: Thoughts on Flash by Steve Jobs --- In flexcoders@yahoogroups.com, Seth Caldwell wiz@ wrote: Steve is employing several tactics used by politicians. The iphone is not open. iPhone is a device, not a technology. Technology should be open, device software could be proprietary. Steve stresses it particularly, please read Job's message more throroughly. I hope that the pressure from Jobs will finally make Adobe get cracking. Hey, what's with Linux support? What is happening with exception handling? are we there yet? No? Adobe, are you still busy with FX prefix? How many more years it will take to implement the feature which should appear first in any development platform. It took us YEARS (sic!) for voting, whinging and asking to fix the bugs and provide basic features. Printing support? Forget it, the company which invented PDF Postscript is too busy with something else. Adobe, please wake up and make your call, otherwise it will be too late. PS By waking up I don't mean submitting another pile of letters to FTC :) -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Alternative FAQ location: https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-1e62079f6847 Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups Links
[flexcoders] Re: Thoughts on Flash by Steve Jobs
--- In flexcoders@yahoogroups.com, PFD Studio p...@... wrote: The talk about openness is completely disingenuous. Flash/Flex/ActionScript is vastly more open than any of the relevant Apple technologies. Here is just a short list of open source projects: -Apache -FreeBSD -Linux -PostgreSQL -Firefox - GNU -Eclipse etc etc etc You can't be half-pregnant. Flash is a proprietary platform and does not matter if Tamarin is open source and Flex is open source. Show us the source code of Flash Player and we will fix your bugs. Until then, please don't call Flash open. PS I don't care about openness of Apple products, we are talking here about Internet technology available on all platforms - Windows, Mac, Linux. Mac Windows are proprietary, Linux is not, so what?
Re: [flexcoders] Re: Thoughts on Flash by Steve Jobs
@ mitek17 Erm... GNash? Why the heck do you need the player sources? You have the SWF specs - player is the program that plays SWF files, you can make your own... In fact, GNash does it already and is GNU program, the problem is flash.* (AS3) package which is a proprietary extension to ECMAScript. If you want Flash to be an open standard - this is what you should be asking for :) Sorry, it's just like asking for ICQ sources while you want to implement OSCAR or Jabber.
Re: [flexcoders] MS - The future of the web is HTML 5
Hehe, I still think that ActiveX was a better idea :) I was against that technology once, but here's my way of how I learned to understand the intention of it and why do I think it wasn't that bad: VIM (a code editor) may be compiled on windows, although it's a console application, so far gVIM exists I thought it should be possible to stick the editor window to a Windows form if, say, I can get VIM in a shape of COM object. I then learned from VIM sources, that it was once been able to do that - it had an option to be compiled with OLE support. These days OLE is an obsolete technology, and there isn't much help on it if you will search MSDN. Any place you come across OLE it would say that ActiveX is the successor and you should use it instead. Reading more on this subject, gives you better understanding of the intention of why it was developed (I don't think it was developed in a very friendly way btw). But, one thing sure - the intention was to design an interface for a foreign program to run inside and communicate with Windows program. Explorer is just a particular case. It was relatively easy to conform to OLE requirements when not using MS tools - that's why VIM has it, but it became increasingly difficult to conform to ActiveX requirement. Well, ActiveX is more feature reach and more advanced in other regards, but it's not achieving its goal because it didn't became a standard interface for linking and embedding :) If you want the analogy in Flash world - think of a pure AS3 code cooperating with Flex framework. A straight forward example - make your display object be a valid candidate to be added into Flex display list - implement IUIComponent... yeah, right, I would give up doing this, it's to much work and most of it, if not all you don't want to do. I don't think that Flex engineers have thought about it in this aspect, and I think that MS engineers spoiled a potentially good idea by poor implementation... Bottom line: I would be much happier to see MS coming up with some alternative to ActiveX, then wasting time on HTML5. Maybe they need HTML5 to not to loose in the browsers battle (because of marketing / advertising and so on), but as I've said in another post, I don't see it as a way internet wants to be in the future. HTML5 is just another swine flu, which is given way much more attention than it's worth IMO.
Re: [flexcoders] httpService useProxy
On 01/05/2010 09:16, Paul Andrews wrote: I have an app which accesses quite a few php urls returning XML that sit in the same directory and domain as the main app. I use a common prefix to the file paths yet for some reason I have flex moaning to me about setting useProxy to false yet it seems to be false already - much time with the debugger and explicit setting makes me think that is certainly the case. Is it some form of voodo? - never really had this kind of problem when using URLLoader and the like. This is Flex 3.0 (with FB 3.0) and I have not moved forward to later versions of the SDK. Paul OK, the vodoo was mine, after all..
[flexcoders] tree Control
Hi all, I need urgent help in the tree Control: I am searching in the tree for a given child the function for that is working fine but I facing a difficulty of expanding the tree up to that child. Can you please help me to do that. Best regards Freeman
[flexcoders] Re: Thoughts on Flash by Steve Jobs
--- In flexcoders@yahoogroups.com, Guy Morton g...@... wrote: On 01/05/2010, at 1:54 PM, Amy wrote: It may be low, but there's a certain amount of logic to it, considering when Steve Jobs was out, he was given a liver transplant. In ancient times, the liver was considered to be the seat of anger. MPO is that there's been a lot of angry behavior coming out of Apple lately, and not just aimed at Adobe. I'd say the anger has almost uniformly been directed *at* Apple (and Jobs). Re-read his articlethere are no angry words there. People who don't like Apple tend to see everything Apple does as an attack on them and their choices, but it's like the egocentric person who thinks everything is about them - Apple can be acting in their own interests and not in yours *without* wishing *you* harm. I don't see Apple lining people up and forcing them to buy iPods, iPads, iPhones or iMacs, so, y'know, people can and will vote with their feet if Apple does stuff they don't like. For me, not supporting Flash on iP*s doesn't outweigh the other good things about the platform and devices, and I like the new emphasis on supporting web standards. Where have you been, with his fights with almost everyone, from HTC to Gizmodo's editor? I also don't see Apple's anti-competitive practices as none of my business, just like it wasn't none of our business that big banks were selling toxic assets to their clients. No one was lining people up forcing them to take out mortgages they couldn't afford, and no one was lining people up forcing investors to buy securities based on those mortgages, but a lot of people who didn't choose to do either wound up paying the price. MPO is that if too many developers jump on the Apple boat, they could wind up choking off parts of the market that I believe will be better for everyone (and certainly me) if they succeed. I'm not going to sit around on my hands and not try to prevent that, to whatever extent I can. http://www.insideria.com/2010/04/what-bugs-me-about-apple.html -Amy
[flexcoders] Re: MS - The future of the web is HTML 5
--- In flexcoders@yahoogroups.com, Oleg Sivokon olegsivo...@... wrote: Hehe, I still think that ActiveX was a better idea :) I was against that technology once, but here's my way of how I learned to understand the intention of it and why do I think it wasn't that bad: VIM (a code editor) may be compiled on windows, although it's a console application, so far gVIM exists I thought it should be possible to stick the editor window to a Windows form if, say, I can get VIM in a shape of COM object. I then learned from VIM sources, that it was once been able to do that - it had an option to be compiled with OLE support. These days OLE is an obsolete technology, and there isn't much help on it if you will search MSDN. Any place you come across OLE it would say that ActiveX is the successor and you should use it instead. Reading more on this subject, gives you better understanding of the intention of why it was developed (I don't think it was developed in a very friendly way btw). But, one thing sure - the intention was to design an interface for a foreign program to run inside and communicate with Windows program. Explorer is just a particular case. It was relatively easy to conform to OLE requirements when not using MS tools - that's why VIM has it, but it became increasingly difficult to conform to ActiveX requirement. Well, ActiveX is more feature reach and more advanced in other regards, but it's not achieving its goal because it didn't became a standard interface for linking and embedding :) If you want the analogy in Flash world - think of a pure AS3 code cooperating with Flex framework. A straight forward example - make your display object be a valid candidate to be added into Flex display list - implement IUIComponent... yeah, right, I would give up doing this, it's to much work and most of it, if not all you don't want to do. I don't think that Flex engineers have thought about it in this aspect, and I think that MS engineers spoiled a potentially good idea by poor implementation... Bottom line: I would be much happier to see MS coming up with some alternative to ActiveX, then wasting time on HTML5. Maybe they need HTML5 to not to loose in the browsers battle (because of marketing / advertising and so on), but as I've said in another post, I don't see it as a way internet wants to be in the future. HTML5 is just another swine flu, which is given way much more attention than it's worth IMO. That's a very good point. Most of the time, when I am using Flex, it's to be used in environments _other_ than the browser. If the Flash Player were not an ActiveX control, I couldn't do that. -Amy
[flexcoders] File reference not working locally :S
A very confusing situation here...
Here's the code:
private function fr_selectHandler(e:Event):Void
{
var fr:FileReference = cast e.target;
var name:String = ;
var where:String = ;
this._queve.push(fr);
fr.addEventListener(ProgressEvent.PROGRESS, this.fr_progressHandler);
fr.addEventListener(Event.COMPLETE, this.fr_completeHandler);
if (!this._loading)
{
this._queve.pop();
fr.upload(new URLRequest(/), name);
ExternalInterface.call(alert, name);
}
}
(I've omitted the part where name is generated, but it's not important)
I'm using HTTPFox to view the connection between the SWF and the server.
The server is Apache/2.2.12 (Win32) DAV/2 mod_ssl/2.2.12 OpenSSL/0.9.8k
mod_autoindex_color PHP/5.3.0 mod_perl/2.0.4 Perl/v5.10.0
I have this in my hosts file (Apparently a Windows machine)
127.0.0.1 test-site.tld
And in httpd.conf
VirtualHost 127.0.0.1
DocumentRoot C:\xampp\xampp\htdocs\projects\test-site
ServerName test-site.tld
/VirtualHost
(it also has the default localhost host + a bunch more sites defined) And
it used to work when on localhost!
Now, when I'm running the code above I get no error, but nothing is sent to
the server. I can see the alert box popping up, which means that the
function doesn't fail at loading. I've compiled for debugging and I am using
a debug version of Flash Player 10.0.45.
I have searched for security warnings in the flash log file - there were
none (besides, there shouldn't be, since the URL is relative).
I have these settings in mm.cfg:
PolicyFileLog=1 # Enables policy file logging
PolicyFileLogAppend=1 # Optional; do not clear log at startup
And policyfiles.txt remains blank...
I've searched Apache logs for maybe an unsuccessful request for
crossdomain.xml, but no, flash player didn't make such requests?
My SWF is loaded like so:
http://test-site.tld/uploader.swf
However the URL of the page is
http://test-site.tld/admin
(I'm using mod_rewrite + have following settings in .htaccess)
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/)$
RewriteRule ^(.*)$ /index.php?q=$1 [QSA,L]
Any ideas of what may be going wrong? I've tried all I could think of...
Thanks.
[flexcoders] Re: File reference not working locally :S
OK, found the problem... HTTPFox doesn't monitor the calls made by FileReference... don't know why, but after I switched to another traffic analyzer I could see the request been made. Sorry, false alarm.
[flexcoders] Bindable metadata tag event name
Hi folks,
The Bindable metadata tag allows an optional event name to be specified
which would be event name that would be dispatched when the property in
consideration changes. I've read somewhere that specifying a distinct event
name for each bindable property reduces the performance overhead (less work
for BindingUtils or so it seems, I can't seem to find the actual
implementation detail). But this doesn't work with bindable properties when
used with flex controls. For e.g. this *works*
mx:Script
[Bindable]
private var txt:String = HI;
private function onCreationCompleteDone(event:Event):void
{
txt = Changed text!;
}
/mx:Script
mx:Text text={txt} /
This doesn't (notice the event name specified):
mx:Script
[Bindable(myEvent)]
private var txt:String = HI;
private function onCreationCompleteDone(event:Event):void
{
txt = Changed text!; // Never called!
}
/mx:Script
mx:Text text={txt} /
I did try analyzing the autogenerated AS files; the ones generated when I
use simple [Bindable] is pretty easy to understand since it generates plain
getter and setter for the `txt` property but when I use
[Bindable(someEvent)], the code generated is a bit cryptic with the stuff
with Watchers and all that.
Would someone be kind enough to shed some light on this matter? How this all
this Bindable stuff work under the hood?
TIA,
sasuke
--
View this message in context:
http://old.nabble.com/Bindable-metadata-tag---event-name-tp28422913p28422913.html
Sent from the FlexCoders mailing list archive at Nabble.com.
Re: [flexcoders] Re: XMLListCollection DataGrid Performance vs Any Other DataProvider Type
Thank you very much Alex. This certainly opens up a lot more for my learning.
Angelo
From: Alex Harui aha...@adobe.com
To: flexcoders@yahoogroups.com flexcoders@yahoogroups.com
Sent: Fri, 30 April, 2010 23:53:07
Subject: Re: [flexcoders] Re: XMLListCollection DataGrid Performance vs Any
Other DataProvider Type
Maybe I wasn’t clear. You will still be using ArrayCollection, but the items
in the collection will be ValueObjects or data class instances instead of
Objects or XML nodes. Properly written ValueObjects are faster than Objects
and much faster than XML nodes for each property you access. If you do it
often enough it pays off the conversion time, and collection item properties
are accessed during scrolling so usually it pays off if folks are going to surf
the data.
It’s pretty simple. If you got XML like this:
Var xml:XML = employees
employee id=”12345”
firstNameAlex/firstName
lastNameHarui/lastName
/employee
employee id=”23456”
firstNameGordon/firstName
lastNameSmith/lastName
/employee
/employees
You get the list of employees:
Var empList:XMLList = xml.employee;
Now if you just do:
Var n:int = empList.length( );
Var arr:Array = new Array();
For (var I = 0; I n; i++)
{
arr[i] = empList[i];
}
Then each of the items in the collection is XML and access to the properties
are significantly slower and scrolling performance may suffer.
If you convert to objects:
For (var I = 0; I n; i++)
{
var emp:XML = empList[i];
var o:Object = new Object();
o.firstName = emp.firstName. toString( );
o.lastName = emp.lastName. toString( );
o.id = e...@id.tostring( );
arr[i] = o;
}
There is a cost to converting the data, but access to properties is much faster
and you’ll probably feel it in scrolling.
The recommended practice is to make a data class or ValueObject
Public class Employee
{
public var id:String;
public var firstName:String
public var lastName:String;
}
For (var I = 0; I n; i++)
{
var emp:XML = empList[i];
var o:Employee = new Employee();
o.firstName = emp.firstName. toString( );
o.lastName = emp.lastName. toString( );
o.id = e...@id.tostring( );
arr[i] = o;
}
Access to data will be the fastest although you may not notice over plain
Object, but the data is now strongly-typed so the compiler will catch you if
you type the property name incorrectly. And someday if you convert to
RemoteObject/ AMF, you’ll already have a data class ready to go.
On 4/30/10 10:54 PM, Angelo Anolin angelo_anolin@ yahoo.com wrote:
I know a bit of converting my XML data into array collection which I can use
as DP for my data-based controls.
I want to get some good examples on what Alex posted to convert the
xmllistcollection to class instances.
I was just thinking cause, xmllistcollection can be definitely bound as a
dataprovider to a flex control but if I am going to convert the
xmllistcollection to a class instance and use that class as dataprovider for
the control, then the overhead may be too much to actually ponder on?
From:jamesfin james.alan.finnigan @gmail.com
To: flexcod...@yahoogro ups.com
Sent: Fri, 30 April, 2010 7:46:57
Subject: [flexcoders] Re: XMLListCollection DataGrid Performance vs Any Other
DataProvider Type
This code will convert for you...
You need to replace the xmllist.myxmldata with your own xml structure names.
private function convertXmlToArrayCo llection( myxml:String ):ArrayCollection
{
var xml:XMLDocument = new XMLDocument( myxml );
var decoder:SimpleXMLDe coder = new SimpleXMLDecoder( );
var data:Object = decoder.decodeXML( xml );
var array:Array = ArrayUtil.toArray( data.xmllist. myxmldata) ;
return new ArrayCollection( array );
}
A quick follow-up after I made this tweak to use objects vs xml.
In my case, performance increased by about 20% when scrolling on a 24
monitor browser full-size by reducing the number of renderers from 10 to 3.
I then pre-translated the original xml data in the conversion so that I
didn't need to do it with a label function.
Performance is now acceptable in full-screen (24) mode.
Bottom-line, avoid renderers. Label functions are better but are still
taxing on the performance if there is a bunch of computing going on in those
functions. Pre-render data when converting from xml to objects.
--- In flexcod...@yahoogro ups.com mailto:flexcoders% 40yahoogroups. com ,
Alex Harui aha...@... wrote:
I don't know of any links off-hand. I would simply create a class with the
set of properties you are interested in, then take the XML and parse it
into instances of that class.
You can try to get XMLDecoder to do it, but sometimes it is more efficient
just to write your own converter.
On 4/29/10 7:50 PM, Angelo Anolin angelo_anolin@ ...
Re: [flexcoders] Bindable metadata tag event name
I've never looked at the implementation. When I do this, I create a custom
getter and setter:
[Bindable(fooChanged)]
public function get foo():Boolean {
return _foo;
}
public function set foo(value:Boolean):void {
if (value != _foo) {
_foo = value;
dispatchEvent(new Event(fooChanged))
}
}
Note that you can also have computed properties based on multiple
properties:
[Bindable(fooChanged)]
[Bindable(barChanged)]
public function get foobar():Boolean {
return _foo _bar;
}
On Sat, May 1, 2010 at 12:54 PM, sasuke uzumaki.naruto...@gmail.com wrote:
Hi folks,
The Bindable metadata tag allows an optional event name to be specified
which would be event name that would be dispatched when the property in
consideration changes. I've read somewhere that specifying a distinct event
name for each bindable property reduces the performance overhead (less work
for BindingUtils or so it seems, I can't seem to find the actual
implementation detail). But this doesn't work with bindable properties when
used with flex controls. For e.g. this *works*
mx:Script
[Bindable]
private var txt:String = HI;
private function onCreationCompleteDone(event:Event):void
{
txt = Changed text!;
}
/mx:Script
mx:Text text={txt} /
This doesn't (notice the event name specified):
mx:Script
[Bindable(myEvent)]
private var txt:String = HI;
private function onCreationCompleteDone(event:Event):void
{
txt = Changed text!; // Never called!
}
/mx:Script
mx:Text text={txt} /
I did try analyzing the autogenerated AS files; the ones generated when I
use simple [Bindable] is pretty easy to understand since it generates plain
getter and setter for the `txt` property but when I use
[Bindable(someEvent)], the code generated is a bit cryptic with the stuff
with Watchers and all that.
Would someone be kind enough to shed some light on this matter? How this
all
this Bindable stuff work under the hood?
TIA,
sasuke
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Re: [flexcoders] Bindable metadata tag event name
Hi,
Yes, even I've done that. But my main gripe is that when you have a Bindable
tag with your custom event name, is it not possible to use it directly with
any custom/built-in flex control?
[Bindable(myEvent)]
private var txt:String = HI;
mx:Text text={txt} / // is this not possible if I use custom events?
I've always used plain bindable tags but I'd like to know whether I can
achieve the same auto-updation functionality when it comes to using bindable
tags with custom events.
Regards,
sasuke
Richard Rodseth wrote:
I've never looked at the implementation. When I do this, I create a custom
getter and setter:
[Bindable(fooChanged)]
public function get foo():Boolean {
return _foo;
}
public function set foo(value:Boolean):void {
if (value != _foo) {
_foo = value;
dispatchEvent(new Event(fooChanged))
}
}
Note that you can also have computed properties based on multiple
properties:
[Bindable(fooChanged)]
[Bindable(barChanged)]
public function get foobar():Boolean {
return _foo _bar;
}
On Sat, May 1, 2010 at 12:54 PM, sasuke uzumaki.naruto...@gmail.com
wrote:
Hi folks,
The Bindable metadata tag allows an optional event name to be specified
which would be event name that would be dispatched when the property in
consideration changes. I've read somewhere that specifying a distinct
event
name for each bindable property reduces the performance overhead (less
work
for BindingUtils or so it seems, I can't seem to find the actual
implementation detail). But this doesn't work with bindable properties
when
used with flex controls. For e.g. this *works*
mx:Script
[Bindable]
private var txt:String = HI;
private function onCreationCompleteDone(event:Event):void
{
txt = Changed text!;
}
/mx:Script
mx:Text text={txt} /
This doesn't (notice the event name specified):
mx:Script
[Bindable(myEvent)]
private var txt:String = HI;
private function onCreationCompleteDone(event:Event):void
{
txt = Changed text!; // Never called!
}
/mx:Script
mx:Text text={txt} /
I did try analyzing the autogenerated AS files; the ones generated when I
use simple [Bindable] is pretty easy to understand since it generates
plain
getter and setter for the `txt` property but when I use
[Bindable(someEvent)], the code generated is a bit cryptic with the
stuff
with Watchers and all that.
Would someone be kind enough to shed some light on this matter? How this
all
this Bindable stuff work under the hood?
TIA,
sasuke
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