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Fix scroll regression near scroll-view ends

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Fix regression in a7b0cb467ca5c4a9447d049910c9e3f0abc5897c which caused
it to be hard to start scrolling at the ends of a scroll-view if using
fine grained scrolling events.

Change-Id: I55f3210150b993281545c3ad5a7356d892fa30b5
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
This commit is contained in:
Allan Sandfeld Jensen 2016-04-28 14:28:08 +02:00
parent c55bdc271f
commit 002112e805
2 changed files with 54 additions and 2 deletions
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5
src/widgets/widgets/qabstractslider.cpp
View File

@ -723,9 +723,10 @@ bool QAbstractSliderPrivate::scrollByDelta(Qt::Orientation orientation, Qt::Keyb
if (stepsToScroll == 0) {
// We moved less than a line, but might still have accumulated partial scroll,
// unless we already are at one of the ends.
if (offset_accumulated > 0.f && value < maximum)
const float effective_offset = invertedControls ? -offset_accumulated : offset_accumulated;
if (effective_offset > 0.f && value < maximum)
return true;
if (offset_accumulated < 0.f && value > minimum)
if (effective_offset < 0.f && value > minimum)
return true;
offset_accumulated = 0;
return false;

51
tests/auto/widgets/widgets/qabstractslider/tst_qabstractslider.cpp
View File

@ -82,6 +82,8 @@ private slots:
#ifndef QT_NO_WHEELEVENT
void wheelEvent_data();
void wheelEvent();
void fineGrainedWheelEvent_data();
void fineGrainedWheelEvent();
#endif
void sliderPressedReleased_data();
void sliderPressedReleased();
@ -897,6 +899,55 @@ void tst_QAbstractSlider::wheelEvent()
if (expectedSignalCount)
QVERIFY(actionTriggeredTimeStamp < valueChangedTimeStamp);
}
void tst_QAbstractSlider::fineGrainedWheelEvent_data()
{
QTest::addColumn<bool>("invertedControls");
QTest::newRow("invertedControls=false") << false;
QTest::newRow("invertedControls=true") << true;
}
void tst_QAbstractSlider::fineGrainedWheelEvent()
{
QFETCH(bool, invertedControls);
QCoreApplication *applicationInstance = QCoreApplication::instance();
QVERIFY(applicationInstance != 0);
QApplication::setWheelScrollLines(3);
slider->setRange(0, 10);
slider->setSingleStep(1);
slider->setPageStep(10);
slider->setInvertedControls(invertedControls);
slider->setOrientation(Qt::Vertical);
slider->setSliderPosition(0);
const int singleStepDelta = invertedControls ? (-WHEEL_DELTA / 3) : (WHEEL_DELTA / 3);
QWheelEvent eventDown(slider->rect().bottomRight(), singleStepDelta / 2,
Qt::NoButton, Qt::NoModifier, Qt::Vertical);
QVERIFY(applicationInstance->sendEvent(slider,&eventDown));
QCOMPARE(slider->sliderPosition(), 0);
QVERIFY(applicationInstance->sendEvent(slider,&eventDown));
QCOMPARE(slider->sliderPosition(), 1);
QWheelEvent eventUp(slider->rect().bottomRight(), -singleStepDelta / 2,
Qt::NoButton, Qt::NoModifier, Qt::Vertical);
QVERIFY(applicationInstance->sendEvent(slider,&eventUp));
QCOMPARE(slider->sliderPosition(), 1);
QVERIFY(applicationInstance->sendEvent(slider,&eventUp));
QCOMPARE(slider->sliderPosition(), 0);
QVERIFY(applicationInstance->sendEvent(slider,&eventUp));
QCOMPARE(slider->sliderPosition(), 0);
QVERIFY(applicationInstance->sendEvent(slider,&eventUp));
QCOMPARE(slider->sliderPosition(), 0);
QVERIFY(applicationInstance->sendEvent(slider,&eventDown));
QCOMPARE(slider->sliderPosition(), 0);
QVERIFY(applicationInstance->sendEvent(slider,&eventDown));
QCOMPARE(slider->sliderPosition(), 1);
}
#endif // !QT_NO_WHEELEVENT
void tst_QAbstractSlider::sliderPressedReleased_data()