X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fview%2Fviewport.hpp;h=c2c42d155d79bf9ecbe28ed54b2741f37271b554;hp=78dfbb24bbfd485f7f12ae1f211145af06d8e933;hb=d75c5d12963b35bd8a8c507f565ec5c57fbdaac6;hpb=e8b969a9ae4e0a683eabddc8ded7babaf03844fd

diff --git a/pv/view/viewport.hpp b/pv/view/viewport.hpp
index 78dfbb24..c2c42d15 100644
--- a/pv/view/viewport.hpp
+++ b/pv/view/viewport.hpp
@@ -18,12 +18,15 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
-#ifndef PULSEVIEW_PV_VIEW_VIEWPORT_H
-#define PULSEVIEW_PV_VIEW_VIEWPORT_H
+#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_;
@@ -103,4 +106,4 @@ private:
 } // namespace view
 } // namespace pv
 
-#endif // PULSEVIEW_PV_VIEW_VIEWPORT_H
+#endif // PULSEVIEW_PV_VIEW_VIEWPORT_HPP