Hi Xuetian, > I'm just coming from a phoronix post about qt5 work on libreoffice. IOha
> noticed that > https://cgit.freedesktop.org/libreoffice/core/commit/?id=1426437be0530a8ba5749c7e76c5ce0e9053af2f > > mentioned that there're still some issues on touchpad, so I'd just like to > provides some info about qt5's wheel event since I had fixed a bunch of > similar issue in KDE some time ago. > > This is because qt5 generates high resolution touchpad event. The correct > implementation can be done by either making use of pixelDelta to do high > resolution scroll, or using angleDelta(or delta in qwidget) to trigger a > "tick" every 120 unit of angle delta. More information can be found at > http://doc.qt.io/qt-5/qml-qtquick-wheelevent.html#angleDelta-prop (it's for > qml but the information about delta also applies to qwidget). > > An example of "120 per tick" implementation in KDE code base can be found > at: > https://lxr.kde.org/source/frameworks/plasma-framework/src/scriptengines/qml/plasmoid/containmentinterface.cpp#1097 > > I guess for this Qt5 work is still WIP probably doesn't worth a bug report, > so I'd just ping some one here. Thanks for the info. It'll definitely be handy at some time. I found https://doc.qt.io/qt-5/qwheelevent.html#angleDelta, which even has a little example and which I kind of copied. The larger problem is to understand, what the LO VCL event expects. And you're right; since we still get the basic stuff running, it doesn't make any sense to open bug reports. I hope something really usable will be ready for 6.0. Still end of January 2018 seems a short ETA to finish everything, not even considering any special KF5 handling. > Regards, Jan-Marek _______________________________________________ LibreOffice mailing list LibreOffice@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/libreoffice
