I investigated the issue by recompiling the QtQuick module and adding
some debug info in qquickflickable.cpp
I added some debug in void
QQuickFlickablePrivate::handleMouseMoveEvent(QMouseEvent *event)
(I only added qDebug, the extra lines are to show the context)
if ((hMoved && !prevHMoved) || (vMoved && !prevVMoved))
q->movementStarting();
qint64 currentTimestamp = computeCurrentTime(event);
qreal elapsed = qreal(currentTimestamp - (lastPos.isNull() ? lastPressTime
: lastPosTime)) / 1000.;
qDebug() << QString("Elapsed " % QString::number(elapsed) % "
currentTimestamp " % QString::number(currentTimestamp)
% " lastPos.isNull " % QString::number(lastPos.isNull()) % "
lastPressTime " % QString::number(lastPressTime)
% " lastPosTime " % QString::number(lastPosTime) % " vertical
velocity " % QString::number(vData.velocity)
% " horizontal velocity " % QString::number(hData.velocity));
if (elapsed <= 0)
return;
And I added some debug in the handleMouseReleaseEvent as well
qDebug() << QString("Mouse release! Elapsed " % QString::number(elapsed) %
" vertical velocity " % QString::number(vData.velocity)
% " horizontal velocity " % QString::number(hData.velocity));
qreal vVelocity = 0;
if (elapsed < 100 && vData.velocity != 0.) {
vVelocity = (QGuiApplicationPrivate::mouseEventCaps(event) &
QTouchDevice::Velocity)
? QGuiApplicationPrivate::mouseEventVelocity(event).y() :
vData.velocity;
}
The resulting log is at http://pastebin.ubuntu.com/15196346/
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https://bugs.launchpad.net/bugs/1549256
Title:
UbuntuTestCase's flick() function is unreliable, does not always flick
a Flickable
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