Hi, I noticed some restrictions to Observer registration that I do not understand. Maybe I made some mistakes, may be not. In the latter case I would be happy to get some explanations about why this is so. (I am using XULRunner)
One can register Observers for various topics using the method AddCategoryEntry of the CategoryManager. Among them are xpcom-startup xpcom-shutdown app-startup quit-application. (1) One can register Observers for the topic xpcom-startup in the component factories method registerSelf. The Observers are notified. It does not matter, whether the respective components are implemented in C++ or JavaScript. (2) One can register Observers for the topic app-startup in the component factories method registerSelf. The Observers are only notified, if the respective components are implemented in C++. They are not notified, if the components are implemented in JavaScript. (3) One can register Observers for the topics xpcom-shutdown and quit- application during notification for the topic xpcom-startup. Notification does occur. (4) One can try to register Observers for the topics xpcom-shutdown and quit-application during notification for the topic app-startup. This does not work, notification does not occur. (rv of AddCategoryEntry signals an error here.) (5) One can try to register Observers for the topics xpcom-shutdown and quit-application in the component factories method registerSelf. One does not get an error (rv is 0), but notification does not occur nonetheless. In the documentation I browsed, I didn't find any explanation for this behaviour. I didn't find any rule either about where to register Observers for which topic. The same questions apply to all the other topics one can register Observers for. Any explanation would be very welcome. Thanks in advance, - Andreas. _______________________________________________ dev-tech-xpcom mailing list [email protected] https://lists.mozilla.org/listinfo/dev-tech-xpcom
