From d196036024697a75868c1f1626525710495ca428 Mon Sep 17 00:00:00 2001 From: Allan Sandfeld Jensen Date: Thu, 23 Nov 2017 14:25:04 +0100 Subject: [PATCH 12/74] Avoid providing bad pixelDeltas on X11 With libinput we now get a hardcoded resolution that is unrelated to the hardware. So avoid using that as a real pixel delta and document pixel deltas as being driver specific and unreliable on X11. Task-number: QTBUG-59261 Change-Id: I9fe86d80e7ccd290ed2e4091d7eafa52cb537d34 Reviewed-by: David Edmundson Reviewed-by: Marco Martin Reviewed-by: Gatis Paeglis --- src/gui/kernel/qevent.cpp | 1 + src/plugins/platforms/xcb/qxcbconnection_xi2.cpp | 14 ++++++++------ 2 files changed, 9 insertions(+), 6 deletions(-) diff --git a/src/gui/kernel/qevent.cpp b/src/gui/kernel/qevent.cpp index 06d52aa78d..c68f9afa56 100644 --- a/src/gui/kernel/qevent.cpp +++ b/src/gui/kernel/qevent.cpp @@ -971,6 +971,7 @@ QWheelEvent::QWheelEvent(const QPointF &pos, const QPointF& globalPos, \li scrolling is about to begin, but the distance did not yet change (Qt::ScrollBegin), \li or scrolling has ended and the distance did not change anymore (Qt::ScrollEnd). \endlist + \note On X11 this value is driver specific and unreliable, use angleDelta() instead */ /*! diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp index d1d97affe8..94f543fd39 100644 --- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp +++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp @@ -953,10 +953,12 @@ void QXcbConnection::xi2HandleScrollEvent(void *event, ScrollingDevice &scrollin double delta = scrollingDevice.lastScrollPosition.y() - value; scrollingDevice.lastScrollPosition.setY(value); angleDelta.setY((delta / scrollingDevice.verticalIncrement) * 120); - // We do not set "pixel" delta if it is only measured in ticks. - if (scrollingDevice.verticalIncrement > 1) + // With most drivers the increment is 1 for wheels. + // For libinput it is hardcoded to a useless 15. + // For a proper touchpad driver it should be in the same order of magnitude as 120 + if (scrollingDevice.verticalIncrement > 15) rawDelta.setY(delta); - else if (scrollingDevice.verticalIncrement < -1) + else if (scrollingDevice.verticalIncrement < -15) rawDelta.setY(-delta); } } @@ -965,10 +967,10 @@ void QXcbConnection::xi2HandleScrollEvent(void *event, ScrollingDevice &scrollin double delta = scrollingDevice.lastScrollPosition.x() - value; scrollingDevice.lastScrollPosition.setX(value); angleDelta.setX((delta / scrollingDevice.horizontalIncrement) * 120); - // We do not set "pixel" delta if it is only measured in ticks. - if (scrollingDevice.horizontalIncrement > 1) + // See comment under vertical + if (scrollingDevice.horizontalIncrement > 15) rawDelta.setX(delta); - else if (scrollingDevice.horizontalIncrement < -1) + else if (scrollingDevice.horizontalIncrement < -15) rawDelta.setX(-delta); } } -- 2.14.3