From 2f544ae7ceaa7b23ab04dc869966576976de44d2 Mon Sep 17 00:00:00 2001
From: kosta <kleontev@Debian11.kleontev.virtualbox.org>
Date: Tue, 7 Feb 2023 18:03:58 +0100
Subject: [PATCH] [bos #32523][EDF] SALOME on Demand GUI. Added render of
 dependency tree into extensions info dialog as SVG.

---
 src/LightApp/CMakeLists.txt          |  2 +
 src/LightApp/LightApp_ExtInfoDlg.cxx | 91 ++++++++++++++++++++--------
 2 files changed, 67 insertions(+), 26 deletions(-)

diff --git a/src/LightApp/CMakeLists.txt b/src/LightApp/CMakeLists.txt
index 16cc420b6..1dd89a2e8 100644
--- a/src/LightApp/CMakeLists.txt
+++ b/src/LightApp/CMakeLists.txt
@@ -102,7 +102,9 @@ SET(_link_LIBRARIES
   ${HDF5_LIBRARIES}
   CASCatch qtx suit std SalomeStyle SalomePrs CAM LogWindow ObjBrowser Event
   ${KERNEL_SalomeHDFPersist} ${KERNEL_SALOMELocalTrace}
+  ${GRAPHVIZ_LIBRARIES}
 )
+
 IF(SALOME_USE_SALOMEOBJECT)
   LIST(APPEND _link_LIBRARIES SalomeObject)
 ENDIF()
diff --git a/src/LightApp/LightApp_ExtInfoDlg.cxx b/src/LightApp/LightApp_ExtInfoDlg.cxx
index 491565a93..d81d95ea5 100644
--- a/src/LightApp/LightApp_ExtInfoDlg.cxx
+++ b/src/LightApp/LightApp_ExtInfoDlg.cxx
@@ -47,6 +47,11 @@
 #include <QPushButton>
 #include <QFileInfo> // to get path to the file
 
+// Render dependency tree
+#include <QSvgWidget>
+#include <QByteArray>
+#include <graphviz/gvc.h>
+
 /*!Constructor.*/
 LightApp_ExtInfoDlg::LightApp_ExtInfoDlg(QWidget* parent)
 : QtxDialog(parent, true, true, ButtonFlags::OK)
@@ -129,7 +134,7 @@ QWidget* LightApp_ExtInfoDlg::getExtTreeWidget(QWidget* parent) const
 {
   MESSAGE("Start to get extensions dependency tree...\n");
 
-  auto extTreeWidget = new QWidget(parent);
+  auto extTreeWidget = new QSvgWidget(parent);
   auto app = dynamic_cast<LightApp_Application*>(SUIT_Session::session()->activeApplication());
   ASSERT(app);
   if (!app)
@@ -137,46 +142,80 @@ QWidget* LightApp_ExtInfoDlg::getExtTreeWidget(QWidget* parent) const
     return extTreeWidget;
   }
 
-  // TODO: replace this list with diagram
-  auto gridLayout = new QGridLayout(extTreeWidget);
-  gridLayout->setSpacing(5);
-
   // Import Python module that manages SALOME extensions
   PyLockWrapper lck; // acquire GIL
   PyObjWrapper extensionQuery = PyImport_ImportModule((char*)"SalomeOnDemandTK.extension_query");
   auto extRootDir = getenv("SALOME_APPLICATION_DIR");
   PyObjWrapper dependencyTree = PyObject_CallMethod(extensionQuery, (char*)"dependency_tree", (char*)"s", extRootDir);
   ASSERT(dependencyTree);
-
-  if (dependencyTree)
+  if (!dependencyTree)
   {
-    PyObject *extName = nullptr;
-    PyObject *dependantsList = nullptr;
-    Py_ssize_t pos = 0;
+    PyErr_Print();
+    return extTreeWidget;
+  }
 
-    // Iterate the tree
-    while (PyDict_Next(dependencyTree, &pos, &extName, &dependantsList))
-    {
-      auto name = new QLabel(PyUnicode_AsUTF8(extName), extTreeWidget);
-      gridLayout->addWidget(name, pos, 0);
+  // Graph to be filled up from python data
+  char graphName[] = "extTreeGraph";
+  Agraph_t* extTreeGraph = agopen(graphName, Agstrictdirected, nullptr);
+  GVC_t* gvc = gvContext();
 
-      SCRUTE(name->text().toStdString());
+  // Python declarations
+  PyObject *extName = nullptr;
+  PyObject *dependantsList = nullptr;
+  Py_ssize_t pos = 0;
 
-      // Iterate a list of dependants
-      for (Py_ssize_t depPos = 0; depPos < PyList_Size(dependantsList); ++depPos)
-      {
-        auto dependant = PyList_GetItem(dependantsList, depPos);
-        auto dependantLabel = new QLabel(PyUnicode_AsUTF8(dependant), extTreeWidget);
-        gridLayout->addWidget(dependantLabel , pos, depPos + 1);
+  // Iterate the tree
+  while (PyDict_Next(dependencyTree, &pos, &extName, &dependantsList))
+  {
+    // Create a parent node if it doesn't already exist
+    auto parentName = PyUnicode_AsUTF8(extName);
+    Agnode_t* parentNode = agnode(extTreeGraph, const_cast<char*>(parentName), true);
+    SCRUTE(parentName);
 
-        SCRUTE(dependantLabel->text().toStdString());
-      }
+    // Iterate a list of dependants
+    for (Py_ssize_t depPos = 0; depPos < PyList_Size(dependantsList); ++depPos)
+    {
+      auto dependant = PyList_GetItem(dependantsList, depPos);
+
+      // Create a child node if it doesn't already exist
+      auto dependantName = PyUnicode_AsUTF8(dependant);
+      Agnode_t* dependantNode = agnode(extTreeGraph, const_cast<char*>(dependantName), true);
+      SCRUTE(dependantName);
+
+      // Make an edge
+      std::string edgeNameStr(parentName);
+      edgeNameStr += dependantName;
+      auto edgeName = edgeNameStr.c_str();
+      agedge(extTreeGraph, parentNode, dependantNode, const_cast<char*>(edgeName), true);
+      SCRUTE(edgeName);
     }
   }
-  else
+
+  // Layout and render to buffer
+  int res = gvLayout(gvc, extTreeGraph, "dot");
+  if (res)
   {
-    PyErr_Print();
+    MESSAGE("gvLayout failed!\n");
+    return extTreeWidget;
   }
 
+  char* buffer = nullptr;
+  unsigned int bufferLength = 0;
+  res = gvRenderData(gvc, extTreeGraph, "svg", &buffer, &bufferLength);
+  if (res)
+  {
+    MESSAGE("gvRenderData failed!\n");
+    return extTreeWidget;
+  }
+
+  // Load the buffer into widget
+  QByteArray renderedGraph(buffer, bufferLength);
+  extTreeWidget->load(renderedGraph);
+
+  // Clean up section
+  gvFreeLayout(gvc, extTreeGraph);
+  gvFreeRenderData(buffer);
+  agclose(extTreeGraph);
+
   return extTreeWidget;
 }
-- 
2.39.2