I think the code in LzFocus.as LzFocus.setFocus() would look something like
this...
if ( !this.csel.shouldYieldFocus() )
return;
Then all focusable views would need to have a default shouldYieldFocus()
method that simply returns true and that the user can override to return
false if conditions aren't met. I'm not sure where this would go. LzNode?
LzView? basecomponent?
The problem is that I'm not that familiar with the internal workings of the
whole laszlo architecture so I'm not sure how best to shoehorn this in
without breaking things.
I haven't tackled building the source yet. That looks pretty daunting.
-----Original Message-----
From: Jim Grandy [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 11, 2006 6:09 PM
To: William Krick
Cc: [email protected]
Subject: Re: [Laszlo-user] laszlo needs a shouldYieldFocus() method
Sounds like a relatively straightforward addition, and I agree we
need something like that.
You've already pretty much written the RFC in your email, and the
change would be small. Could you at minimum write up a JIRA bug?
Contributing the change would also be fantastic, and ensure that it
happened on your timeframe. (I'd start looking in LzFocus.as, in
LzFocus.setFocus(), perhaps just after the line that sets
__LZsfrunning to true.)
jim
On Jan 11, 2006, at 2:28 PM, William Krick wrote:
> We're trying to develop a fairly sophisticated application in laszlo.
>
> One of the most difficult and frustrating parts is validating user
> input and
> this may cause us to give up on laszlo entirely.
>
> We really need the ability to stop a focus change if the contents
> of a field
> is invalid.
>
> In Java, this problem was solved by giving each component a
> shouldYieldFocus() method.
>
> The way this works, when any other component wants to take focus,
> either by
> user action via keyboard or mouse, or programmatically, the focus
> system has
> to call the current focus owner's shouldYieldFocus() method first.
> This
> method by default just always returns true. However, you can
> override the
> method with your own implementation that can return false if certain
> conditions aren't met. Returning false prevents the focus system from
> moving focus to the new component.
>
> Laszlo really needs something similar in order for it to be viable for
> "real" applications. Otherwise we might as well just go back to
> HTML forms
> and do all our validation server-side.
>
>
>
> _______________________________________________
> Laszlo-user mailing list
> [email protected]
> http://www.openlaszlo.org/mailman/listinfo/laszlo-user
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