cabana: small improvements to charts (#27140)

* cabana: small improvements to charts toolbar

* show column count when wide enough

* call setspacing

* set in same place

* remove call to updateToolBar()

tools/cabana/chartswidget.cc

@@ -30,8 +30,8 @@ ChartsWidget::ChartsWidget(QWidget *parent) : QWidget(parent) {
   title_label->setContentsMargins(0, 0, 12, 0);
   columns_cb = new QComboBox(this);
   columns_cb->addItems({"1", "2", "3", "4"});
-  toolbar->addWidget(new QLabel(tr("Columns:")));
-  toolbar->addWidget(columns_cb);
+  columns_lb_action = toolbar->addWidget(new QLabel(tr("Columns:")));
+  columns_cb_action = toolbar->addWidget(columns_cb);
 
   QLabel *stretch_label = new QLabel(this);
   stretch_label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
@@ -46,8 +46,7 @@ ChartsWidget::ChartsWidget(QWidget *parent) : QWidget(parent) {
   range_slider->setPageStep(60);  // 1 min
   toolbar->addWidget(range_slider);
 
-  toolbar->addWidget(zoom_range_lb = new QLabel());
-  reset_zoom_btn = toolbar->addAction(bootstrapPixmap("arrow-counterclockwise"), "");
+  reset_zoom_btn = toolbar->addAction(bootstrapPixmap("zoom-out"), "");
   reset_zoom_btn->setToolTip(tr("Reset zoom (drag on chart to zoom X-Axis)"));
   remove_all_btn = toolbar->addAction(bootstrapPixmap("x"), "");
   remove_all_btn->setToolTip(tr("Remove all charts"));
@@ -55,10 +54,13 @@ ChartsWidget::ChartsWidget(QWidget *parent) : QWidget(parent) {
   main_layout->addWidget(toolbar);
 
   // charts
+  charts_layout = new QGridLayout();
+  charts_layout->setSpacing(10);
+
   QWidget *charts_container = new QWidget(this);
   QVBoxLayout *charts_main_layout = new QVBoxLayout(charts_container);
   charts_main_layout->setContentsMargins(0, 0, 0, 0);
-  charts_main_layout->addLayout(charts_layout = new QGridLayout);
+  charts_main_layout->addLayout(charts_layout);
   charts_main_layout->addStretch(0);
 
   QScrollArea *charts_scroll = new QScrollArea(this);
@@ -167,7 +169,6 @@ void ChartsWidget::setMaxChartRange(int value) {
 
 void ChartsWidget::updateToolBar() {
   range_lb->setText(QString(" %1:%2 ").arg(max_chart_range / 60, 2, 10, QLatin1Char('0')).arg(max_chart_range % 60, 2, 10, QLatin1Char('0')));
-  zoom_range_lb->setText(is_zoomed ? tr("Zooming: %1 - %2").arg(zoomed_range.first, 0, 'f', 2).arg(zoomed_range.second, 0, 'f', 2) : "");
   title_label->setText(tr("Charts: %1").arg(charts.size()));
   dock_btn->setIcon(bootstrapPixmap(docking ? "arrow-up-right" : "arrow-down-left"));
   dock_btn->setToolTip(docking ? tr("Undock charts") : tr("Dock charts"));
@@ -230,8 +231,13 @@ void ChartsWidget::setColumnCount(int n) {
 void ChartsWidget::updateLayout() {
   int n = column_count;
   for (; n > 1; --n) {
-    if ((n * (CHART_MIN_WIDTH + charts_layout->spacing())) < rect().width()) break;
+    if ((n * CHART_MIN_WIDTH + (n - 1) * charts_layout->spacing()) < charts_layout->geometry().width()) break;
   }
+
+  bool show_column_cb = n > 1;
+  columns_lb_action->setVisible(show_column_cb);
+  columns_cb_action->setVisible(show_column_cb);
+
   for (int i = 0; i < charts.size(); ++i) {
     charts_layout->addWidget(charts[charts.size() - i - 1], i / n, i % n);
   }

tools/cabana/chartswidget.h

@@ -116,7 +116,6 @@ private:
   ChartView *findChart(const QString &id, const Signal *sig);
 
   QLabel *title_label;
-  QLabel *zoom_range_lb;
   QLabel *range_lb;
   QSlider *range_slider;
   bool docking = true;
@@ -131,6 +130,8 @@ private:
   std::pair<double, double> display_range;
   std::pair<double, double> zoomed_range;
   bool use_dark_theme = false;
+  QAction *columns_lb_action;
+  QAction *columns_cb_action;
   QComboBox *columns_cb;
   int column_count = 1;
   const int CHART_MIN_WIDTH = 300;