On 31 Jul 2012, at 15:50, Thomas Geymayer wrote: > > Maybe we should create different categories/priorities (just a numeric > value) of windows where one window can only raise to the top inside a > category.
Right, that's a pretty standard system in window ordering. > > The more I think about it the less I'm convinced about a Nasal-only > event class. There can occur many problems with (accidentally) setting > the mouse values in the wrong order, or how to get the mouse values > inside every affected element without copying to much properties around > and also thread synchronisation (if it is used) will get complicated. Right. In general since we have no way to change several properties atomically, relying on very complex property listeners often comes down to knowing which order the C++ code makes changes - the Autopilot and Environment systems have the issue to some degree I think. > How do you want to register callbacks if a custom class should be passed > as argument? Is it possible to set the value of a property node to a > custom class? I was assuming I'd create a Nasal ghost for Canvas::Element, and another for osgGA::Event, or a Canvas::Event if we need an explicit class. Then we need some global Nasal C functions to map from a Canvas property node to the Nasal ghost (i.e finding the underlying C++ canvas::Element). All of the above is only a few lines of code and I've been doing it for FGPositioned recently - it's pretty easy. Once that's done we define the 'addXYZCVallback' methods in C++, and have them capture an naFunctionRef for the callbacks - again I've already done this and it works nicely. When the C++ element receives an event it can check its registered callback list, wrap the event in a ghost and run whichever callbacks apply. If you want me to prototype some code for this, I am happy to do so! James ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
