I would like to chime in on this as well. I have practically re-written the
form classes to make them implement our "standard look and feel" all of this
should have been able to be done via sub-classing but SO MANY private variables
and functions prevented it, I basically copied and recreated all the form
classes for our application what w waist, can't wait to try to update this
stuff with the next version just updating them to have the hooks for automation
(Flex 2.0.1) has me concerned.
----- Original Message ----
From: Gordon Smith <[EMAIL PROTECTED]>
To: flexcoders@yahoogroups.com
Sent: Friday, March 9, 2007 1:50:14 PM
Subject: RE: [flexcoders] Re: Are other developers hesitant to extend existing
classes in Flex?
Actually, preventDefault( ) does NOT prevent other listeners
from executing; this is what stopPropagation( ) and stopImmediatePropag ation()
do.
preventDefault( ) simply sets the flag returned by
isDefaultPrevented( ) to be true. However, some event-dispatching code in the
Player or the framework is written like this (and you can do the same thing
in your apps):
dispatchEvent( event);
if
(!event.isDefaultPr evented() )
doSomethingByDefaul t();
So calling preventDefault( ) prevents doSomethingByDefaul t()
from being executed. But doSomethingByDefaul t() is not a
listener.
- Gordon
From: [EMAIL PROTECTED] ups.com
[mailto:flexcoders@ yahoogroups. com] On Behalf Of Danko
Kozar
Sent: Friday, March 09, 2007 1:52 AM
To:
[EMAIL PROTECTED] ups.com
Subject: [flexcoders] Re: Are other
developers hesitant to extend existing classes in Flex?
Jason, this was an eye-opener!
Till now I didn't realize that an event
listener can cancel another
listeners. But the "preventDefault( )"
method of the Event class does
exactly that.
This is the way I should
go with a PagableGrid.
Thanks!
--- In [EMAIL PROTECTED] ups.com,
"Jason Hawryluk" <[EMAIL PROTECTED]> wrote:
>
> As a follow up to the
last response, take note of the
> event.preventDefaul t(); in the
handler for HEADER_RELEASE, and the
fact that
> I don't do a refresh
on the ListCollectionView after adding the
>
> sort to it.
>
> jason
>
>
>
>
>
> -----Message
d'origine--- --
> De : [EMAIL PROTECTED] ups.com
[mailto:[EMAIL PROTECTED] ups.com]De
la
> part de Danko Kozar
> Envoyé : jeudi 8 mars 2007 11:48
>
À : [EMAIL PROTECTED] ups.com
>
Objet : [flexcoders] Re: Are other developers hesitant to extend
existing
> classes in Flex?
>
>
> Private methods
and variables drive me nuts..
>
> For example, I'd like to make a
simple DataGrid change: make
headers
> clickable without refreshing
the grid (just toggle a sort icon).
> (I need this behaviour because I'd
like to have a paging DataGrid
> which only propagates the sort
column/direction info to a record-
> feching routine on a server)
>
> So, I try to remove a "collection. refresh() ;" line
from
> the "sortByColumn( )" function, but I can't - because it's
private.
>
> Then, I try to make a new function called
"sortByColumn2"
(that's a
> copy of the first one, but without
"refresh" stuff) and alter
> the "headerReleaseHandl er" which calls
it, but I can't - cause
it's
> private.
>
> And finally,
I am trying to add the following code to the
> constructor (yes, the
constructor is public, huh.. :-))
> to "neutralize" the event
listener:
>
>
removeEventListener (DataGridEvent. HEADER_RELEASE,
>
headerReleaseHandle r,
> false,
EventPriority. DEFAULT_HANDLER) ;
>
> ... but I can't cause
"headerReleaseHandl er" is private and
can't be
> seen from a
subclass!
>
> And then, I give up.. :-)
>
> My
conclussion is that Flex framework classes are not extensible
> enough and
I really can't see a reason.
> Copying the whole DataGrid class and it's
renderer, style, etc.
> classes isn't a solution, we all agree. If not
other reason -
it's
> not the OOP way.
>
> So, I'm
tempted to go to a "C:\Program Files\Adobe\ Flex Builder 2
> \Flex SDK
2\frameworks\ source\mx\ " folder and make a global
search
>
and replace on all files in this folder. You guess...
> replace "private"
with "protected". .. :-)
>
> --- In [EMAIL PROTECTED] ups.com,
"Dana Gutride" <dgutride@>
> wrote:
> >
> >
Recently on this list, somebody said that the Flex framework
team
>
has been
> > surprised at the resistance many developers have to
subclassing
> and they'd
> > like to understand it better. I'd
like to put my 2 cents into
this
> > discussion because maybe we
can come up with some good answers.
> >
> > I think the
ability to extend the existing framework is
fabulous,
> but I
find
> > that I am hesitant to subclass or extend the existing
classes.
> Recently, I
> > spent several days trying to override
the placeSortArrow
function
> on the
> > datagrid. I ended up
ditching my code because there were so
many
> private
> >
variables used by the existing placeSortArrow( ) function that I
>
would need
> > to rewrite most of the datagrid.as file.
>
>
> > I've bought books and searched online for answers, but I
haven't
> found
> > anything satisfactory yet. Maybe if there
were more resources
> (even if we
> > had to pay for them), we
would find more developers extending
the
> flex
> >
framework.
> >
> > Dana
> >
>
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