Take into account QApplication::wheelScrollLines() in wheel events

when setting a different "mouse wheel scrolls by" value in the
mouse kcm, the user expects every view to scroll more or less
accordingly (even if it's not strictlya text view)
This makes the scroll in dolphin take that into account

REVIEW:126718

2 files changed, 5 insertions, 4 deletions

diff --git a/src/kitemviews/kitemlistcontainer.cpp b/src/kitemviews/kitemlistcontainer.cpp
index c9d521ce7..94b49dbde 100644
--- a/src/kitemviews/kitemlistcontainer.cpp
+++ b/src/kitemviews/kitemlistcontainer.cpp
@@ -194,12 +194,12 @@ void KItemListContainer::wheelEvent(QWheelEvent* event)
         }
     } else {
         const int numDegrees = event->angleDelta().y() / 8;
-        const int numSteps = numDegrees / 15;
+        const int numSteps = qApp->wheelScrollLines() * numDegrees / 15;
         if (event->modifiers().testFlag(Qt::ShiftModifier)) {
             const int scrollingDirection = numSteps > 0 ? 1 : -1;
             smoothScroller->scrollTo(scrollBar->value() - scrollBar->pageStep() * scrollingDirection);
         } else {
-            smoothScroller->scrollTo(scrollBar->value() - numSteps * scrollBar->pageStep() / 4);
+            smoothScroller->scrollTo(scrollBar->value() - numSteps * scrollBar->pageStep() / 12);
         }
     }
 
diff --git a/src/kitemviews/private/kitemlistsmoothscroller.cpp b/src/kitemviews/private/kitemlistsmoothscroller.cpp
index 2bd467aa5..c89d3cf8f 100644
--- a/src/kitemviews/private/kitemlistsmoothscroller.cpp
+++ b/src/kitemviews/private/kitemlistsmoothscroller.cpp
@@ -19,6 +19,7 @@
 
 #include "kitemlistsmoothscroller.h"
 
+#include <QApplication>
 #include <QEvent>
 #include <QPropertyAnimation>
 #include <QScrollBar>
@@ -200,8 +201,8 @@ void KItemListSmoothScroller::handleWheelEvent(QWheelEvent* event)
         numPixels = event->pixelDelta().y();
     } else {
         const int numDegrees = event->angleDelta().y() / 8;
-        const int numSteps = numDegrees / 15;
-        numPixels = numSteps * m_scrollBar->pageStep() / 4;
+        const int numSteps = qApp->wheelScrollLines() * numDegrees / 15;
+        numPixels = numSteps * m_scrollBar->pageStep() / 12;
     }
     int value = m_scrollBar->value();
     if (event->modifiers().testFlag(Qt::ShiftModifier)) {