- // Only use closest left or right edge if they're close to the cursor
- if ((left_delta < right_delta) && (left_delta < snap_distance_))
- nearest = edges.front().first;
- if ((left_delta >= right_delta) && (right_delta < snap_distance_))
- nearest = edges.back().first;
+ // Only use closest left or right edge if they're close to the cursor
+ if ((left_delta < right_delta) && (left_delta <= snap_distance_))
+ nearest_sample = nearest_edges.front().first;
+ if ((left_delta >= right_delta) && (right_delta <= snap_distance_))
+ nearest_sample = nearest_edges.back().first;
+ } else {
+ // Determine nearest edge from all signals
+
+ int64_t nearest_delta = numeric_limits<int64_t>::max();
+ for (shared_ptr<Signal> s : signals_) {
+ if (!s->enabled())
+ continue;
+
+ // Calculate sample number from cursor position
+ const double samples_per_pixel = s->base()->get_samplerate() * scale();
+ const int64_t x_offset = offset().convert_to<double>() / scale();
+ const int64_t sample_num = max(((x_offset + p.x()) * samples_per_pixel), 0.0);
+
+ vector<data::LogicSegment::EdgePair> edges =
+ s->get_nearest_level_changes(sample_num);
+
+ if (edges.size() != 2)
+ continue;
+
+ // We received absolute sample numbers, make them relative
+ const int64_t left_sample_delta = sample_num - edges.front().first;
+ const int64_t right_sample_delta = edges.back().first - sample_num - 1;
+
+ const int64_t left_delta = left_sample_delta / samples_per_pixel;
+ const int64_t right_delta = right_sample_delta / samples_per_pixel;
+
+ if ((left_delta < nearest_delta) || (right_delta < nearest_delta)) {
+ nearest_delta = min(left_delta, right_delta);
+
+ if (nearest_delta <= snap_distance_)
+ nearest_sample = (nearest_delta == left_delta) ?
+ edges.front().first : edges.back().first;
+
+ // Somewhat ugly hack to make TimeItem::drag_by() work
+ signal_under_mouse_cursor_ = s;
+ }
+ }
+ }