X-Git-Url: http://git.code-monkey.de/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fview%2Fviewport.hpp;h=c2c42d155d79bf9ecbe28ed54b2741f37271b554;hp=2c8211b8dce43b2cee22e8fb872ae7a64af15c2c;hb=60d9b99a32e551cffd2b537d3e157d578a761c9b;hpb=dae21ebcf60d6a5d7c194736b1dc792a5cbf06a5

diff --git a/pv/view/viewport.hpp b/pv/view/viewport.hpp
index 2c8211b..c2c42d1 100644
--- a/pv/view/viewport.hpp
+++ b/pv/view/viewport.hpp
@@ -21,9 +21,12 @@
 #ifndef PULSEVIEW_PV_VIEW_VIEWPORT_HPP
 #define PULSEVIEW_PV_VIEW_VIEWPORT_HPP
 
+#include <boost/optional.hpp>
+
 #include <QTimer>
 #include <QTouchEvent>
 
+#include "pv/util.hpp"
 #include "viewwidget.hpp"
 
 class QPainter;
@@ -93,7 +96,7 @@ private:
 	void wheelEvent(QWheelEvent *event);
 
 private:
-	double drag_offset_;
+	boost::optional<pv::util::Timestamp> drag_offset_;
 
 	double pinch_offset0_;
 	double pinch_offset1_;