Review Request 124670: Scrolling fixes for Dolphin

[Emmanuel Pescosta]

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Thanks for the patch! Looks good :)
I'll test it tomorrow.

- Emmanuel Pescosta


On Aug. 9, 2015, 11:52 a.m., Maxim Mikityanskiy wrote:
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> (Updated Aug. 9, 2015, 11:52 a.m.)
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> Review request for Dolphin.
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> Repository: dolphin
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> Description
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> KItemListSmoothScroller::handleWheelEvent has some issues.
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> At first, when I scroll file list holding mouse over the list, one mouse wheel tick corresponds to 1/4 page interval, but when I hover on QScrollBar, one wheel tick corresponds to 1 page interval.
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> At second, in KItemListSmoothScroller::eventFilter we don't return true, so that QScrollBar also handles this event, and total scroll interval is m_scrollBar->pageStep() + m_scrollBar->singleStep().
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> At third, when I use touchpad that supports smooth scrolling via XInput2, and I hover it over QScrollBar, I can only scroll content if I move my fingers very fast, because numSteps = event->delta() / 8 / 15 is just zero unless I move very fast (event->delta() in this case is less than 120).
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> At fourth, holding Shift while scrolling has no effect when holding mouse over QScrollBar in contrast to scrolling faster when holding mouse over file list.
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> The patch eliminates all these issues making the behavior of KItemListSmoothScroller the same as in KItemListContainer::wheelEvent, adding support for QWheelEvent::pixelDelta() and removing usage of deprecated QWheelEvent::delta().
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> Diffs
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>   src/kitemviews/private/kitemlistsmoothscroller.cpp e70f478 
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> Diff: https://git.reviewboard.kde.org/r/124670/diff/
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> Testing
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> Thanks,
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> Maxim Mikityanskiy
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