X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fviews%2Ftrace%2Fsignal.hpp;h=1b9f254330a79fd150f6f73165f5cb910a76b5be;hp=d763609d972abc322dc796e9aca32a2add66269f;hb=f6b6c9bf50999dc99f9517318ffd3114cae4960f;hpb=2d458a761b9fb184cd1c903485293f86fd552637

diff --git a/pv/views/trace/signal.hpp b/pv/views/trace/signal.hpp
index d763609d..1b9f2543 100644
--- a/pv/views/trace/signal.hpp
+++ b/pv/views/trace/signal.hpp
@@ -27,6 +27,8 @@
 
 #include <cstdint>
 
+#include <pv/data/logicsegment.hpp>
+
 #include "trace.hpp"
 #include "viewitemowner.hpp"
 
@@ -44,6 +46,15 @@ class SignalData;
 namespace views {
 namespace trace {
 
+/**
+ * The Signal class represents a series of numeric values that can be drawn.
+ * This is the main difference to the more generic @ref Trace class.
+ *
+ * It is generally accepted that Signal instances consider themselves to be
+ * individual channels on e.g. an oscilloscope, though it should be kept in
+ * mind that virtual signals (e.g. math) will also be served by the Signal
+ * class.
+ */
 class Signal : public Trace, public ViewItemOwner
 {
 	Q_OBJECT
@@ -59,6 +70,15 @@ public:
 
 	virtual shared_ptr<pv::data::SignalData> data() const = 0;
 
+	/**
+	 * Determines the closest level change (i.e. edge) to a given sample, which
+	 * is useful for e.g. the "snap to edge" functionality.
+	 *
+	 * @param sample_pos Sample to use
+	 * @return The changes left and right of the given position
+	 */
+	virtual vector<data::LogicSegment::EdgePair> get_nearest_level_changes(uint64_t sample_pos) = 0;
+
 	/**
 	 * Returns true if the trace is visible and enabled.
 	 */
@@ -74,7 +94,7 @@ public:
 
 	virtual void populate_popup_form(QWidget *parent, QFormLayout *form);
 
-	QMenu* create_context_menu(QWidget *parent);
+	QMenu* create_header_context_menu(QWidget *parent);
 
 	void delete_pressed();