Snap new automation points in AutomationRegionViews (#4297).

git-svn-id: svn://localhost/ardour2/branches/3.0@10059 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 25 insertions, 0 deletions

diff --git a/gtk2_ardour/region_view.cc b/gtk2_ardour/region_view.cc
index df26452934..534c7ef0d6 100644
--- a/gtk2_ardour/region_view.cc
+++ b/gtk2_ardour/region_view.cc
@@ -950,3 +950,28 @@ RegionView::trim_contents (framepos_t frame_delta, bool left_direction, bool swa
 	region_changed (PropertyChange (ARDOUR::Properties::start));
 }
 
+/** Snap a frame offset within our region using the current snap settings.
+ *  @param x Frame offset from this region's position.
+ *  @return Snapped frame offset from this region's position.
+ */
+frameoffset_t
+RegionView::snap_frame_to_frame (frameoffset_t x) const
+{
+	PublicEditor& editor = trackview.editor();
+
+	/* x is region relative, convert it to global absolute frames */
+	framepos_t const session_frame = x + _region->position();
+
+	/* try a snap in either direction */
+	framepos_t frame = session_frame;
+	editor.snap_to (frame, 0);
+
+	/* if we went off the beginning of the region, snap forwards */
+	if (frame < _region->position ()) {
+		frame = session_frame;
+		editor.snap_to (frame, 1);
+	}
+
+	/* back to region relative */
+	return frame - _region->position();
+}