Hi, I'm just coming from a phoronix post about qt5 work on libreoffice. I 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. Regards, Xuetian -- Sent from: http://nabble.documentfoundation.org/Dev-f1639786.html