Am 02.06.18 um 18:46 schrieb Jason H: > I never noticed the differnce On AES encryption, the iOS devices were > faster, but in terms of Qt, I did not observe anything notable. > > > In Qt, do you know how costly is the bridge? > It's usually C++/ObjC or C++/JNI, so it's fast. > > > how fast is V4 vs javascriptcore? > It's not terrible. And it's getting better all the time. Note that the > "proper way" is to do it all in C++ and only use QML for glue code, > not to write a lot of app logic in it. (I don't think anyone follows > that though) I'm always trying ;-) while developing I'm doing many things in QML because it's easy done but later the final code I always try to 'move' as much as possible from QML to C++ to publish performant Apps (this year I'm doing again the QtWorldSummit Conference App and will try only to have some glue code in QML) BTW: started Qt for mobile apps with BB10 Cascades and first I learned from Cascades developers at BlackBerry to do as much as possible in C++ > > I understood that the native objects are only communicating with the > js via the signal/slot right. How would you compare it with RN? > No, sometimes you do direct API. Like for wake locks, notifications, > etc. But 99% of the time, you just roll that into a C++ QObject and > expose that to QML, so it's highly re-usable and use signals and > slots. So it doesn't matter where you can use it, from QML or C++... > > > *Sent:* Saturday, June 02, 2018 at 4:37 AM > *From:* "Sylvain Pointeau" <sylvain.point...@gmail.com> > *To:* "Jason H" <jh...@gmx.com> > *Cc:* "Vlad Stelmahovsky" <vladstelmahov...@gmail.com>, interest > <interest@qt-project.org> > *Subject:* Re: [Interest] QtQuick for mobile - any experience to share? > On Wed, 30 May 2018 at 20:38, Sylvain Pointeau > <sylvain.point...@gmail.com <mailto:sylvain.point...@gmail.com>> wrote: > > I have still not made any decision yet, I am doing some testing to > get a better idea. Thanks a lot so far to all for your feedback. > > > I investigated into React Native, as I know Qt quick by reading a lot > about it and trying time to time through the years. > > RN has 3 parts: the js, the native and the bridge. > > the native is specific for a plateform, objective c for ios and java > for android > the js is with javascriptcore but without the jit on ios > the bridge is basically a serialisation, I read that this is the most > costly. > > the js and the native are asynchrone so every call between them must > be returned by a callback or with a future > > so if I need something in my app that requires something special, long > calculation, threads, queued database writes, it will probably require > the native and I will have to write it for each platform. > > I have some pain to see how fast is the js, I also heard that Android > is much slower than ios. Did you observe that with Qt? > > In Qt, do you know how costly is the bridge? how fast is V4 vs > javascriptcore? I understood that the native objects are only > communicating with the js via the signal/slot right. How would you > compare it with RN? > > > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest
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