Fix regression concerning Control+mouse wheel zooming

Commit 9311f4bc97ec7000be46b8eec242a8 accidentally removed
DolphinView::wheelEvent(), which is responsible for the handling of
Control+mouse wheel events. These should change the zoom level.

2 files changed, 17 insertions, 0 deletions

diff --git a/src/views/dolphinview.cpp b/src/views/dolphinview.cpp
index f2f434f46..2bd95767a 100644
--- a/src/views/dolphinview.cpp
+++ b/src/views/dolphinview.cpp
@@ -712,6 +712,19 @@ bool DolphinView::eventFilter(QObject* watched, QEvent* event)
     return QWidget::eventFilter(watched, event);
 }
 
+void DolphinView::wheelEvent(QWheelEvent* event)
+{
+    if (event->modifiers().testFlag(Qt::ControlModifier)) {
+        const int numDegrees = event->delta() / 8;
+        const int numSteps = numDegrees / 15;
+
+        setZoomLevel(zoomLevel() + numSteps);
+        event->accept();
+    } else {
+        event->ignore();
+    }
+}
+
 void DolphinView::activate()
 {
     setActive(true);
diff --git a/src/views/dolphinview.h b/src/views/dolphinview.h
index c3981bef4..770bbde72 100644
--- a/src/views/dolphinview.h
+++ b/src/views/dolphinview.h
@@ -553,6 +553,10 @@ signals:
      */
     void writeStateChanged(bool isFolderWritable);
 
+protected:
+    /** Changes the zoom level if Control is pressed during a wheel event. */
+    virtual void wheelEvent(QWheelEvent* event);
+
 private slots:
     /**
      * Marks the view as active (DolphinView:isActive() will return true)