1 files changed, 22 insertions, 0 deletions
diff --git a/src/ui/previewholder.cpp b/src/ui/previewholder.cpp
index 0dac18665..0b280ccb9 100644
--- a/src/ui/previewholder.cpp
+++ b/src/ui/previewholder.cpp
@@ -17,6 +17,7 @@
 #include <gtkmm/scrolledwindow.h>
 #include <gtkmm/sizegroup.h>
 #include <gtkmm/scrollbar.h>
+#include <gtkmm/adjustment.h>
 
 #define COLUMNS_FOR_SMALL 16
 #define COLUMNS_FOR_LARGE 8
@@ -56,9 +57,30 @@ PreviewHolder::PreviewHolder() :
 
 PreviewHolder::~PreviewHolder()
 {
+
 }
 
+bool PreviewHolder::on_scroll_event(GdkEventScroll *event)
+{
+    // Scroll horizontally by page on mouse wheel
+#if WITH_GTKMM_3_0
+    Glib::RefPtr<Gtk::Adjustment> adj = dynamic_cast<Gtk::ScrolledWindow*>(_scroller)->get_hadjustment();
+#else
+    Gtk::Adjustment *adj = dynamic_cast<Gtk::ScrolledWindow*>(_scroller)->get_hadjustment();
+#endif
+
+    if (!adj) {
+        return FALSE;
+    }
+
+    int move = (event->direction == GDK_SCROLL_DOWN) ? adj->get_page_size() : -adj->get_page_size();
+
+    double value = std::min(adj->get_upper() - move, adj->get_value() + move );
 
+    adj->set_value(value);
+
+    return FALSE;
+}
 
 void PreviewHolder::clear()
 {