LzNodes don't interact with the focus, so it seems that the right entry point is LzView. I think you'd just want to add a function to view that returns true.
As for building the sources, it is kind of a pain but I know people have done it. The good news is that you're not going to be messing with the compiler, so you can use buildlfc. This is the best starting point I know of: http://wiki.openlaszlo.org/Build_Instructions Here's a bit on buildlfc: http://wiki.openlaszlo.org/How_to_Build#Incremental_build Your bravery will blaze a trail for the legions that will follow. A On Jan 12, William Krick wrote: > 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 > > > > _______________________________________________ > Laszlo-user mailing list > [email protected] > http://www.openlaszlo.org/mailman/listinfo/laszlo-user > _______________________________________________ Laszlo-user mailing list [email protected] http://www.openlaszlo.org/mailman/listinfo/laszlo-user
