On Tue, 2009-04-07 at 10:31 -0500, Curtis Olson wrote: > Ctrl-Shift-click on the "." entry in the property browser fires all > the listeners of the parent node. > > Each property can have multiple listeners tied to it. There are > various types of listeners (read, write) and various modes of > operation. > > When a listener's trigger conditions are met, it then executes the > associated nasal code. (Is it possible to also trigger C code? > Probably, but I don't know if that is done or not.) > > So to activate this newly added behavior in the property browser, > simply cd to the property node parent, and ctrl-shift click on the "." > entry in the children list. Then the parent's changevalue listener > will be fired. > > I point this out not to be critical (which might be assumed because my > prior message was somewhat critical) ... this is all *very* useful > functionality. But I want to point out that there are some very > complex interactions between the property systems, these things called > "listeners" which fire when a property is accessed in any number of > ways, and the nasal code that is triggered as a result. And then this > functionality is leveraged in a variety of subtle ways by the 3d > modeling system, multiplayer system, instrument panels, systems > modeling, etc. We have a large complex network of code snippets that > are executed as a side effect of changing (or even viewing) values in > the property system. > > Not every aspect of our property system is simple and self > documenting ... again, not to be critical, complex tasks often require > complex solutions, but I say this to balance out the occasional claim > that the property system is entirely self documenting ... yes at some > levels, but not on many other levels. > > Curt.
Curt, This is exactly the point here. The underpinnings of the property tree are complex. And when the gentleman who has been responsible for building and maintaining that complexity stands up and cries out: "STOP, go back! This way lies monsters" It is not wise to shout him down with "damn the torpedoes full speed ahead." Thanks, Ron ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
