4 files changed, 39 insertions, 1 deletions
diff --git a/src/gui/kernel/qplatformintegration.cpp b/src/gui/kernel/qplatformintegration.cpp
index fd7f475bee..fe1861e08b 100644
--- a/src/gui/kernel/qplatformintegration.cpp
+++ b/src/gui/kernel/qplatformintegration.cpp
@@ -409,6 +409,8 @@ QVariant QPlatformIntegration::styleHint(StyleHint hint) const
         return QPlatformTheme::defaultThemeHint(QPlatformTheme::ItemViewActivateItemOnSingleClick);
     case UiEffects:
         return QPlatformTheme::defaultThemeHint(QPlatformTheme::UiEffects);
+    case WheelScrollLines:
+        return QPlatformTheme::defaultThemeHint(QPlatformTheme::WheelScrollLines);
     }
 
     return 0;
diff --git a/src/gui/kernel/qplatformintegration.h b/src/gui/kernel/qplatformintegration.h
index 22a834f0e1..466b3348bd 100644
--- a/src/gui/kernel/qplatformintegration.h
+++ b/src/gui/kernel/qplatformintegration.h
@@ -157,7 +157,8 @@ public:
         TabFocusBehavior,
         ReplayMousePressOutsidePopup,
         ItemViewActivateItemOnSingleClick,
-        UiEffects
+        UiEffects,
+        WheelScrollLines,
     };
 
     virtual QVariant styleHint(StyleHint hint) const;
diff --git a/src/gui/kernel/qstylehints.cpp b/src/gui/kernel/qstylehints.cpp
index 22c077da41..85c0768e35 100644
--- a/src/gui/kernel/qstylehints.cpp
+++ b/src/gui/kernel/qstylehints.cpp
@@ -78,6 +78,7 @@ public:
         , m_cursorFlashTime(-1)
         , m_tabFocusBehavior(-1)
         , m_uiEffects(-1)
+        , m_wheelScrollLines(-1)
         {}
 
     int m_mouseDoubleClickInterval;
@@ -88,6 +89,7 @@ public:
     int m_cursorFlashTime;
     int m_tabFocusBehavior;
     int m_uiEffects;
+    int m_wheelScrollLines;
 };
 
 /*!
@@ -495,4 +497,33 @@ void QStyleHints::setUseHoverEffects(bool useHoverEffects)
     emit useHoverEffectsChanged(useHoverEffects);
 }
 
+/*!
+    \property QStyleHints::wheelScrollLines
+    \brief Number of lines to scroll by default for each wheel click.
+
+    \since 5.9
+*/
+int QStyleHints::wheelScrollLines() const
+{
+    Q_D(const QStyleHints);
+    if (d->m_wheelScrollLines > 0)
+        return d->m_wheelScrollLines;
+    return themeableHint(QPlatformTheme::WheelScrollLines, QPlatformIntegration::WheelScrollLines).toInt();
+}
+
+/*!
+    Sets the \a wheelScrollLines.
+    \internal
+    \sa wheelScrollLines()
+    \since 5.9
+*/
+void QStyleHints::setWheelScrollLines(int scrollLines)
+{
+    Q_D(QStyleHints);
+    if (d->m_wheelScrollLines == scrollLines)
+        return;
+    d->m_wheelScrollLines = scrollLines;
+    emit wheelScrollLinesChanged(scrollLines);
+}
+
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qstylehints.h b/src/gui/kernel/qstylehints.h
index fb55cc7ed6..b9bf428edd 100644
--- a/src/gui/kernel/qstylehints.h
+++ b/src/gui/kernel/qstylehints.h
@@ -71,6 +71,7 @@ class Q_GUI_EXPORT QStyleHints : public QObject
     Q_PROPERTY(Qt::TabFocusBehavior tabFocusBehavior READ tabFocusBehavior NOTIFY tabFocusBehaviorChanged FINAL)
     Q_PROPERTY(bool singleClickActivation READ singleClickActivation STORED false CONSTANT FINAL)
     Q_PROPERTY(bool useHoverEffects READ useHoverEffects WRITE setUseHoverEffects NOTIFY useHoverEffectsChanged FINAL)
+    Q_PROPERTY(int wheelScrollLines READ wheelScrollLines NOTIFY wheelScrollLinesChanged FINAL)
 
 public:
     void setMouseDoubleClickInterval(int mouseDoubleClickInterval);
@@ -99,6 +100,8 @@ public:
     bool singleClickActivation() const;
     bool useHoverEffects() const;
     void setUseHoverEffects(bool useHoverEffects);
+    int wheelScrollLines() const;
+    void setWheelScrollLines(int scrollLines);
 
 Q_SIGNALS:
     void cursorFlashTimeChanged(int cursorFlashTime);
@@ -109,6 +112,7 @@ Q_SIGNALS:
     void startDragTimeChanged(int startDragTime);
     void tabFocusBehaviorChanged(Qt::TabFocusBehavior tabFocusBehavior);
     void useHoverEffectsChanged(bool useHoverEffects);
+    void wheelScrollLinesChanged(int scrollLines);
 
 private:
     friend class QGuiApplication;