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Recommended Property Tree Enhancements

86 bytes added, 19:06, 5 June 2009
m
Suggested new attributes in PropertyList XML files
* "scope" or "lifetime" to formally describe the scope of a node as discussed in [[FlightGear Sessions]]
* "live" (or similar) - to indicate dynamically updated (at runtime) node data, i.e. automatically register a corresponding listener for such properties, rather than just using the static value obtained during parse time and treat it as const then, this is likely to be useful for a number of scenarios: right now, each individual FG component requiring this feature, needs to implement it separately, i.e. the autopilot code now features support for dynamically modifiable properties, as well [http://sourceforge.net/mailarchive/message.php?msg_id=47F0027F.6080304%40telus.net], the same applies to the gui/dialog code, which may also make use of "live" properties [http://mail.flightgear.org/pipermail/flightgear-cvslogs/2004-May/007871.html], whose values may change at runtime. Increasingly, it is getting obvious that other FlightGear components may also benefit from such a feature [http://sourceforge.net/mailarchive/forum.php?thread_name=483C054B.5010305%40g2ms.com&forum_name=flightgear-devel] or [http://www.mail-archive.com/flightgear-devel@lists.sourceforge.net/msg22403.html]. Thus, it would seem appropriate to generalize the concept of "live properties", whose values may be changed and ought to take effect accordingly. This attribute might from another attribute to indicate the corresponding listener-bound property, i.e.:
<PropertyList>
<foo type="double" live="true" property="/foo/myfoo/value"/>
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