Thanks, now it is clear what did they mean 2014-12-26 13:22 GMT+03:00 Dmitry Volosnykh <dmitry.volosn...@gmail.com>:
> Dmitry, you can read more on that in this wiki article: > http://qt-project.org/wiki/QmlStyling > Primarily, you are interested in section "Nesting QtObjects", but reading > the whole article would be useful too. > > In our application, we found it more convenient to do that in slightly > different manner. We instantiate a single instance of that component > (rather than making it be a true singleton) which is placed in the root > .qml file and provided with some id (say, 'appStyle') which is supposed by > our internal convention to be a global name used to refer from any other > QML component. This trick allows us to live code UI components. True > singletons lack this ability since they are not re-created at the time UI > gets reloaded due to changes to .qml files. My collegue has noted that such > implicit referring to an id out of component definition may impact QML > engine performance. Maybe some one can elaborate more on this. > > Regards, > Dmitry. > > On Fri, Dec 26, 2014 at 1:12 PM, Dmitry Q <linuxsquirrel....@gmail.com> > wrote: > >> Hi. In the official QML documentation we see the following suggestion ( >> http://doc.qt.io/qt-5/qtquick-performance.html): >> >> >>> >> Use singleton types instead of pragma library scripts >> >> If you are using a pragma library script to store application-wide >> instance data, consider using a QObject singleton type instead. This should >> result in better performance, and will result in less JavaScript heap >> memory being used. >> <<< >> >> What does is mean? How should we use QObject singletons? For example, I >> have the following ".pragma library" JS to store application-wide constants: >> >> .pragma library >> var X = 10; >> ... many other declarations... >> >> How should I rewrite this with QObject singletons? >> >> _______________________________________________ >> Interest mailing list >> Interest@qt-project.org >> http://lists.qt-project.org/mailman/listinfo/interest >> >> >
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