Good stuff! This is the sort of thing that might make a good contribution to extend the standard Bindings class.
Scott On Sun, Dec 15, 2013 at 5:49 PM, Tomas Mikula <tomas.mik...@gmail.com>wrote: > On Sun, Dec 15, 2013 at 6:39 PM, Scott Palmer <swpal...@gmail.com> wrote: > > Interesting idea. > > > > There is a case I have been curious about and wonder what the best > practices > > are for it. Suppose you have a case when you are changing multiple > > different properties that will be used in a single calculation. You > want to > > deal with a single change to all of them in one go. E.g. imagine you > have > > an "area" property that is bound to both "width" and "height". You want > to > > write code like: > > > > obj.setWidth(w); > > obj.setHeight(h); > > > > and have only ONE recalculation of the area property happen. Currently > the > > way bindings work the area will be calculated twice. The intermediate > > calculation is really not a value that you ever want to observe. > > Hi Scott, > > this is precisely the problem that I'm trying to address here. Now, > the question is whether you have control over the implementation of > obj. > > If yes, then it is the same case as the AND gate "motivational > example" from InhiBeans page. You provide a method setSize(w, h) and > use block()/release() to implement it in a way that causes only one > change of the area property. > > If you cannot change the implementation of obj, what you can do is to > bind an inhibeans.binding.DoubleBinding to the "area" value, call it > relaxedArea, and listen to that one for all your purposes. > Then you resize obj like this: > > relaxedArea.block(); > obj.setWidth(); > obj.setHeight(); > relaxedArea.release(); > > Only one change of relaxedArea is emitted. > > Best, > Tomas > > > > > Are there helpers for this sort of situation? Are there guidelines in > the > > JavaFX docs somewhere? > > > > Regards, > > > > Scott > > > > > > On Sat, Dec 14, 2013 at 11:54 PM, Tomas Mikula <tomas.mik...@gmail.com> > > wrote: > >> > >> Hello, > >> > >> I just published a small extension of javafx bindings and properties > >> that can help you reduce redundant recalculations. > >> > >> They provide two additional methods: > >> > >> public void block(); > >> public void release(); > >> > >> Call p.block() when you suspect your actions will lead to multiple > >> invalidations of p, and call p.release() when you are done and want to > >> deliver a single invalidation notification to p's observers. > >> > >> https://github.com/TomasMikula/InhiBeans > >> > >> Regards, > >> Tomas > > > > >
