Method buildLocalToolbar

pj_app/src/MainWindow.cpp:4390–4565

}

void MainWindow::buildLocalToolbar() {
  // Populates the plot-config page of the right-sidepanel stack: a
  // "Curve Width" header + flow-strip, a "Curve Style" header +
  // flow-strip, then the CurveEditor (added by the caller). Sections
  // wrap as the panel narrows; below ~72 px the headers hide and the
  // icon strips stack into a 1- or 2-col snap.
  auto* outer = qobject_cast<QVBoxLayout*>(plot_config_page_->layout());
  if (outer == nullptr) {
    return;
  }

  struct ToolSpec {
    const char* object_name;
    const char* icon_path;
    const char* tooltip;
    std::function<void()> on_click;
  };
  const auto on_width = [this](double w) { return [this, w]() { applyActivePlotWidth(w); }; };
  const auto on_style = [this](int s) { return [this, s]() { applyActivePlotStyle(s); }; };

  auto build_section = [this, outer](
                           const QString& heading, const QString& header_object_name,
                           const std::vector<ToolSpec>& specs) -> QWidget* {
    // Heading: the shared titlebar-tone band (pj_widgets SectionHeaderBand,
    // themed via the PJ--SectionHeaderBand QSS class rule). The objectName is
    // kept for widget-tree selectors; the chrome-metrics handler resizes it.
    auto* header = new SectionHeaderBand(heading, plot_config_page_);
    header->setObjectName(header_object_name);
    header->setFixedHeight(chrome_metrics_.icon_size + chrome_metrics_.icon_padding);
    outer->addWidget(header);

    // Icon strip: FlowLayout, spacing 0 so icons sit flush with each
    // other and the chrome bands. Each button is the standard chrome
    // 24×24 with a 20×20 icon, matching every other icon in the app.
    //
    // hasHeightForWidth(true) on the size policy is what lets the strip
    // grow tall when it has to wrap — without it, the parent QVBoxLayout
    // asks for sizeHint().height() (one row's worth, 24 px), and the
    // wrapped rows render below the strip's bottom edge and get clipped.
    // Each strip wraps independently inside its own section, so icons
    // never cross a section header.
    auto* strip = new QWidget(plot_config_page_);
    QSizePolicy strip_policy(QSizePolicy::Preferred, QSizePolicy::Minimum);
    strip_policy.setHeightForWidth(true);
    strip->setSizePolicy(strip_policy);
    auto* flow = new FlowLayout(strip, /*margin=*/0, /*h_spacing=*/0, /*v_spacing=*/0);
    for (const auto& spec : specs) {
      auto* btn = new SvgButton(strip);
      btn->setObjectName(QString::fromLatin1(spec.object_name));
      btn->setIconPath(QString::fromLatin1(spec.icon_path));
      btn->setExtent(chrome_metrics_.icon_size + chrome_metrics_.icon_padding, chrome_metrics_.icon_size);
      btn->setToolTip(tr(spec.tooltip));
      connect(btn, &QToolButton::clicked, this, spec.on_click);
      flow->addWidget(btn);
    }
    outer->addWidget(strip);
    return header;
  };