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Fix computation of scroll value

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This commit is contained in:
Guillaume Munch 2016-05-27 23:59:25 +01:00
parent d2d243d77f
commit 0e3c8ba627
1 changed files with 4 additions and 2 deletions
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6
src/frontends/qt4/GuiWorkArea.cpp
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@ -937,8 +937,10 @@ void GuiWorkArea::wheelEvent(QWheelEvent * ev)
int const lines = qApp->wheelScrollLines();
int const page_step = verticalScrollBar()->pageStep();
// Test if the wheel mouse is set to one screen at a time.
int scroll_value = lines > page_step
? page_step : lines * verticalScrollBar()->singleStep();
// This is according to
// https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
int scroll_value =
min(lines * verticalScrollBar()->singleStep(), page_step);
// Take into account the rotation and the user preferences.
scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);