Add horizontal scrolling for tracker list and torrent content

src/gui/properties/trackerlistwidget.cpp

@@ -41,6 +41,7 @@
 #include <QTreeWidgetItem>
 #include <QUrl>
 #include <QVector>
+#include <QWheelEvent>
 
 #include "base/bittorrent/peerinfo.h"
 #include "base/bittorrent/session.h"
@@ -683,3 +684,19 @@ void TrackerListWidget::displayColumnHeaderMenu()
 
     menu->popup(QCursor::pos());
 }
+
+void TrackerListWidget::wheelEvent(QWheelEvent *event)
+{
+    if (event->modifiers() & Qt::ShiftModifier)
+    {
+        // Shift + scroll = horizontal scroll
+        event->accept();
+        QWheelEvent scrollHEvent {event->position(), event->globalPosition()
+            , event->pixelDelta(), event->angleDelta().transposed(), event->buttons()
+            , event->modifiers(), event->phase(), event->inverted(), event->source()};
+        QTreeView::wheelEvent(&scrollHEvent);
+        return;
+    }
+
+    QTreeView::wheelEvent(event);  // event delegated to base class
+}

src/gui/properties/trackerlistwidget.h

@@ -87,6 +87,7 @@ private slots:
 
 private:
     int visibleColumnsCount() const;
+    void wheelEvent(QWheelEvent *event) override;
 
     static QStringList headerLabels();
 

src/gui/torrentcontenttreeview.cpp

@@ -35,6 +35,7 @@
 #include <QMessageBox>
 #include <QModelIndexList>
 #include <QThread>
+#include <QWheelEvent>
 
 #include "base/bittorrent/abstractfilestorage.h"
 #include "base/bittorrent/common.h"
@@ -152,3 +153,19 @@ QModelIndex TorrentContentTreeView::currentNameCell()
 
     return model()->index(current.row(), TorrentContentModelItem::COL_NAME, current.parent());
 }
+
+void TorrentContentTreeView::wheelEvent(QWheelEvent *event)
+{
+    if (event->modifiers() & Qt::ShiftModifier)
+    {
+        // Shift + scroll = horizontal scroll
+        event->accept();
+        QWheelEvent scrollHEvent {event->position(), event->globalPosition()
+            , event->pixelDelta(), event->angleDelta().transposed(), event->buttons()
+            , event->modifiers(), event->phase(), event->inverted(), event->source()};
+        QTreeView::wheelEvent(&scrollHEvent);
+        return;
+    }
+
+    QTreeView::wheelEvent(event);  // event delegated to base class
+}

src/gui/torrentcontenttreeview.h

@@ -50,4 +50,5 @@ public:
 
 private:
     QModelIndex currentNameCell();
+    void wheelEvent(QWheelEvent *event) override;
 };