Fix right-click in notebook viewers; hint on empty schematic (0.1.1)

python/naja_schematic/__init__.py

@@ -5,7 +5,7 @@
 - From a shell: ``naja-schematic --verilog design.v --open`` serves the
   viewer page and opens it in a browser.
 """
-__version__ = "0.1.0"
+__version__ = "0.1.1"
 
 from .protocol import diagnosis_response, handle_request
 

python/naja_schematic/static/widget.js

@@ -25,11 +25,17 @@ function render({ model, el }) {
   injectStyle();
   const wrap = document.createElement("div");
   wrap.className = "naja-schematic-wrap";
+  // Right-click belongs to the viewer (its tree and schematic context menus
+  // hold Show Equipotential, Trace to Driver, ...). JupyterLab opens its own
+  // cell menu on top unless the target is inside this attribute.
+  wrap.setAttribute("data-jp-suppress-context-menu", "");
   wrap.style.height = `${model.get("height")}px`;
   const canvas = document.createElement("canvas");
   canvas.className = "naja-schematic-canvas";
   canvas.tabIndex = -1;
-  canvas.addEventListener("contextmenu", (e) => e.preventDefault());
+  // Also keep the event from reaching other hosts' menu handlers (classic
+  // Notebook, VSCode, Colab) and suppress the browser's own menu.
+  canvas.addEventListener("contextmenu", (e) => { e.preventDefault(); e.stopPropagation(); });
   // Keyboard input only goes to the viewer while it has focus.
   canvas.addEventListener("mousedown", () => canvas.focus());
   const status = document.createElement("div");

src/EquipotentialView.cpp

@@ -1445,6 +1445,15 @@ void EquipotentialView::renderSchematic(const std::vector<Equipotential*>& equip
     }
 
     g_schematic.render(dl, cpos, inner);
+    if (equipotentials.empty()) {
+        // Nothing drawn yet: the schematic is only ever filled from a pin's
+        // context menu, which a first-time user has no way to guess.
+        const char* hint = "Right-click a pin in the Netlist Hierarchy (e.g. top > Terms > a port)\n"
+                           "and choose Show Equipotential or Trace to Driver.";
+        ImVec2 ts = ImGui::CalcTextSize(hint);
+        dl->AddText(ImVec2(cpos.x + (inner.x - ts.x) * 0.5f, cpos.y + (inner.y - ts.y) * 0.5f),
+                    IM_COL32(120, 120, 120, 255), hint);
+    }
     ImGui::EndChild();
 
     // Scrollbars