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GUI Messages: Difference between revisions
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== Intro == | |||
FlightGear is using a simple property-based messaging system which can render GUI messages using propoerty listenenrs and the [[PUI]] GUI system. | FlightGear is using a simple property-based messaging system which can render GUI messages using propoerty listenenrs and the [[PUI]] GUI system. | ||
== Background == | |||
Whatever is written to <code>/sim/messages/*</code> at runtime is shown on-screen for a few seconds, then moved away. When the next message is written to that node, that is moved on-screen. | Whatever is written to <code>/sim/messages/*</code> at runtime is shown on-screen for a few seconds, then moved away. When the next message is written to that node, that is moved on-screen. | ||
Behind the scenes, this works by using a property listener/callback that is triggered whenever the property tree branch is modified. | Behind the scenes, this works by using a property listener/callback that is triggered whenever the property tree branch is modified. | ||
{{FGCquote | |||
|1= The ATC subsystem shouldn't really generate the message *and* display it, no matter which method is used. It should rather only set a property to the generated message, for example /sim/messages/atc. A different subsystem should then take this message and display it -- using the same code for ATC and other screen messages. It should be glue code that decides what to do with the message property (c++ and Nasal listeners). Send it to the screen like now, print it to the console, forward it to the speech synthesis module | |||
|2= {{cite web | |||
| url = http://sourceforge.net/p/flightgear/mailman/message/12101220/ | |||
| title = <nowiki>[Flightgear-devel] Re: screen.nas: log windows</nowiki> | |||
| author = <nowiki>Melchior FRANZ</nowiki> | |||
| date = Feb 4th, 2006 | |||
| added = Feb 4th, 2006 | |||
| script_version = 0.23 | |||
}} | |||
}} | |||
== Feautres == | |||
This system is primarily used by the following features: | This system is primarily used by the following features: | ||