[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
I've moved the general accuracy problem that's specific to Unity8 into bug 1607223. This bug is all about certain apps only, and is reproducible in Untiy7. ** Package changed: qtmir (Ubuntu) => qtdeclarative-opensource-src (Ubuntu) ** No longer affects: qtmir ** Summary changed: - Touchpad scrolling is disproportionately faster than mouse wheel scrolling + Touchpad scrolling in dash and system settings is disproportionately faster than mouse wheel scrolling ** Description changed: - Touchpad scrolling is disproportionately faster than mouse wheel - scrolling in Unity8 (web browser and system settings). + Touchpad scrolling in dash and system settings is disproportionately + faster than mouse wheel scrolling I can only say this with confidence today because I implemented accurate smooth scrolling in Xmir yesterday, so I know how it should behave. It's possible QtMir is overreacting to the large number of events that touchpads generate compared to a mouse wheel, without taking into account the scroll magnitude of each one is smaller. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling in dash and system settings is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
That's weird. The problem persists even in System Settings under Unity7. So not a bug in QtMir but more a bug in the toolkit layer (!?) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
Interestingly webbrowser-app under Unity7 behaves much better (same findings as bug 1523823). So whatever the problem is in our QML app scrolling is not a problem in webbrowser-app. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
Come to think of it, the core of this bug might be outside of QtMir. That is whatever eventually receives handleWheelEvent is failing to scroll proportionately to the magnitude of angleDelta, and instead is scrolling just proportionately to the number of calls to handleWheelEvent. ** Changed in: qtmir (Ubuntu) Assignee: Daniel van Vugt (vanvugt) => (unassigned) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
Actually I think this bug might be tangential to the precision problem in QtMir. QtMir appears to maintain a little smooth scrolling to a precision of roughly 0.067 mouse wheel ticks. But touchpads commonly have a precision of more like 0.00025 equivalent mouse wheel ticks. So both problems are real. It's possible I have tied them together here in a single bug erroneously though. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
To solve _this_bug_ as the description states it is probably much simpler: We should scale the number of integer wheel events sent to Qt according to the float magnitude of the Mir vscroll axis. So QtMir should accumulate vscroll values as a float and only emit them to Qt each time that value ticks over an integer value. That will correct the relative scrolling distances being disproportionate between mice and touchpads. ** Changed in: qtmir (Ubuntu) Assignee: (unassigned) => Daniel van Vugt (vanvugt) ** Also affects: qtmir Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
That's an idea but we have a problem with libinput/Mir I think... It hides two-finger events from the client during a scroll, and only delivers vscroll events instead. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
Ah no, I'm reading the API wrong (kudos to faenil for correcting me): QPoint pixelDelta is in integers, as are all QWheelEvent calculations. So that's not going to work without breaking Qt APIs, which is unlikely. An alternative option might be to us Qt's support for native gesture events - this is used on OS X. These do let Qt do Pan/Swipe gestures with float precision. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
Are you looking at the right code? I see this from Qt5.4 source (qtbase/src/gui/kernel/qwindowsysteminterface.h) static void handleWheelEvent(QWindow *w, const QPointF & local, const QPointF & global, QPoint pixelDelta, QPoint angleDelta, Qt::KeyboardModifiers mods = Qt::NoModifier, Qt::ScrollPhase phase = Qt::ScrollUpdate); static void handleWheelEvent(QWindow *w, ulong timestamp, const QPointF & local, const QPointF & global, QPoint pixelDelta, QPoint angleDelta, Qt::KeyboardModifiers mods = Qt::NoModifier, Qt::ScrollPhase phase = Qt::ScrollUpdate); Scroll units are floats. The line you're quoting is a QtMir internal thing, which we mistakenly used ints for. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
Bad news: The broken handleWheelEvent syntax is one we have inherited from QWindowSystemInterface so we can't just fix it in QtMir to use QPointF and libinput-style smooth scrolling :( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1605513] Re: Touchpad scrolling is disproportionately faster than mouse wheel scrolling
Found the problem: void handleWheelEvent(ulong timestamp, QPoint angleDelta, Qt::KeyboardModifiers mods) override QPoint is a pair of integers, but touchpad scroll values are floats. ** Changed in: unity8 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1605513 Title: Touchpad scrolling is disproportionately faster than mouse wheel scrolling To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1605513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
