cabana: show units (#27433)

* show units on chart y axis

* show in signal list

* show in historyview

* use clear()
old-commit-hash: a5644faa3f1095c2aa36b12e534fbba1b2ac921d

tools/cabana/chartswidget.cc

@@ -542,9 +542,16 @@ void ChartView::updateAxisY() {
 
   double min = std::numeric_limits<double>::max();
   double max = std::numeric_limits<double>::lowest();
+  QString unit = sigs[0].sig->unit;
+
   for (auto &s : sigs) {
     if (!s.series->isVisible()) continue;
 
+    // Only show unit when all signals have the same unit
+    if (unit != s.sig->unit) {
+      unit.clear();
+    }
+
     auto first = std::lower_bound(s.vals.begin(), s.vals.end(), axis_x->min(), [](auto &p, double x) { return p.x() < x; });
     auto last = std::lower_bound(first, s.vals.end(), axis_x->max(), [](auto &p, double x) { return p.x() < x; });
     for (auto it = first; it != last; ++it) {
@@ -552,6 +559,8 @@ void ChartView::updateAxisY() {
       if (it->y() > max) max = it->y();
     }
   }
+  axis_y->setTitleText(unit);
+
   if (min == std::numeric_limits<double>::max()) min = 0;
   if (max == std::numeric_limits<double>::lowest()) max = 0;
 
@@ -563,7 +572,8 @@ void ChartView::updateAxisY() {
 
     QFontMetrics fm(axis_y->labelsFont());
     int n = qMax(int(-qFloor(std::log10((max_y - min_y) / (tick_count - 1)))), 0) + 1;
-    y_label_width = qMax(fm.width(QString::number(min_y, 'f', n)), fm.width(QString::number(max_y, 'f', n))) + 15;  // left margin 15
+    int title_spacing = axis_y->titleText().isEmpty() ? 0 : 20;
+    y_label_width = title_spacing + qMax(fm.width(QString::number(min_y, 'f', n)), fm.width(QString::number(max_y, 'f', n))) + 15;  // left margin 15
     axis_y->setLabelFormat(QString("%.%1f").arg(n));
     emit axisYLabelWidthChanged(y_label_width);
   }

tools/cabana/historylog.cc

@@ -48,7 +48,15 @@ QVariant HistoryLogModel::headerData(int section, Qt::Orientation orientation, i
       if (section == 0) {
         return "Time";
       }
-      return show_signals ? sigs[section - 1]->name : "Data";
+      if (show_signals) {
+        QString name = sigs[section - 1]->name;
+        if (!sigs[section - 1]->unit.isEmpty()) {
+          name += QString(" (%1)").arg(sigs[section - 1]->unit);
+        }
+        return name;
+      } else {
+        return "Data";
+      }
     } else if (role == Qt::BackgroundRole && section > 0 && show_signals) {
       return QBrush(getColor(sigs[section - 1]));
     }

tools/cabana/signaledit.cc

@@ -62,6 +62,9 @@ void SignalModel::updateState(const QHash<MessageId, CanData> *msgs) {
     int row = 0;
     for (auto item : root->children) {
       QString value = QString::number(get_raw_value((uint8_t *)dat.begin(), dat.size(), *item->sig));
+      if (!item->sig->unit.isEmpty()){
+        value += " " + item->sig->unit;
+      }
       if (value != item->sig_val) {
         item->sig_val = value;
         emit dataChanged(index(row, 1), index(row, 1), {Qt::DisplayRole});