0027398: Integrate Qt Browser Widget to Open CASCADE Technology

The following implementation has been made:
- CMake procedure is extended to compile Qt tools. This is optional and is handled by USE_QT_TOOLS option(OFF by default)
- It is possible to build Qt tools using Qt5 or Qt4, it is settled with USE_QT4 option.
- Sample of DFBrowser tool is available in samples/tools/TInspectorEXE. It is build with tools, executable is placed in binaries. To start the sample, use dfbrowser.bat command.
- DFBrowser tool may be started from DRAW

tools/DFBrowser/DFBrowser_ItemBase.cxx

@@ -0,0 +1,151 @@
+// Created on: 2017-06-16
+// Created by: Natalia ERMOLAEVA
+// Copyright (c) 2017 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement. 
+
+#include <DFBrowser_ItemBase.hxx>
+
+#include <DFBrowser_Item.hxx>
+#include <DFBrowser_Module.hxx>
+#include <DFBrowser_Tools.hxx>
+
+#include <DFBrowserPane_AttributePane.hxx>
+#include <DFBrowserPane_ItemRole.hxx>
+#include <DFBrowserPane_Tools.hxx>
+
+#include <TDataStd_Name.hxx>
+#include <TDF_ChildIterator.hxx>
+
+#include <QColor>
+#include <QIcon>
+#include <QVariant>
+
+//#define REQUIRE_OCAF_REVIEW:20
+// =======================================================================
+// function : Constructor
+// purpose :
+// =======================================================================
+DFBrowser_ItemBase::DFBrowser_ItemBase (TreeModel_ItemBasePtr theParent, const int theRow, const int theColumn)
+: TreeModel_ItemBase (theParent, theRow, theColumn), myModule (0), myIsUseAdditionalInfo (true)
+{
+}
+
+// =======================================================================
+// function : reset
+// purpose :
+// =======================================================================
+void DFBrowser_ItemBase::Reset()
+{
+  setLabel (TDF_Label());
+  TreeModel_ItemBase::Reset();
+}
+
+// =======================================================================
+// function : GetLabel
+// purpose :
+// =======================================================================
+TDF_Label DFBrowser_ItemBase::GetLabel() const
+{
+  initItem();
+  return myLabel;
+}
+
+// =======================================================================
+// function : data
+// purpose :
+// =======================================================================
+QVariant DFBrowser_ItemBase::data (const QModelIndex& theIndex, int theRole) const
+{
+  int aRole = theRole;
+  if (Column() == 0 && useAdditionalInfo())
+  {
+    switch (theRole)
+    {
+      case Qt::DisplayRole: { aRole = DFBrowserPane_ItemRole_DisplayExtended; break; }
+      case Qt::ToolTipRole: { aRole = DFBrowserPane_ItemRole_ToolTipExtended; break; }
+    }
+  }
+  return TreeModel_ItemBase::data (theIndex, aRole);
+}
+
+// =======================================================================
+// function : initRowCount
+// purpose :
+// =======================================================================
+int DFBrowser_ItemBase::initRowCount() const
+{
+  TDF_Label aLabel = GetLabel();
+  if (aLabel.IsNull())
+    return 0;
+
+  return aLabel.NbChildren() + aLabel.NbAttributes();
+}
+
+// =======================================================================
+// function : initValue
+// purpose :
+// =======================================================================
+QVariant DFBrowser_ItemBase::initValue (const int theItemRole) const
+{
+  switch (theItemRole)
+  {
+    case Qt::DisplayRole:
+    case Qt::EditRole:
+    case Qt::ToolTipRole:
+      return DFBrowser_Tools::GetLabelInfo (myLabel, false);
+    case DFBrowserPane_ItemRole_DisplayExtended:
+    case DFBrowserPane_ItemRole_ToolTipExtended:
+      return DFBrowser_Tools::GetLabelInfo (myLabel, true);
+    case Qt::ForegroundRole:
+    {
+      QVariant aValue = QColor (Qt::black);
+      if (DFBrowser_Tools::IsEmptyLabel(GetLabel()))
+        aValue = QColor (Qt::lightGray);
+      else
+      { //! TEMPORARY HERE : should be moved in the pane of TDataStd_Name kind of attribute
+        Handle(TDataStd_Name) aName;
+        if (useAdditionalInfo() && myLabel.FindAttribute (TDataStd_Name::GetID(), aName))
+          aValue = QColor (Qt::darkGreen);
+      }
+      return aValue;
+    }
+    case Qt::DecorationRole: return DFBrowser_Tools::GetLabelIcon (myLabel);
+    default: break;
+  }
+  return QVariant();
+}
+
+// =======================================================================
+// function : createChild
+// purpose :
+// =======================================================================
+TreeModel_ItemBasePtr DFBrowser_ItemBase::createChild (int theRow, int theColumn)
+{
+  TreeModel_ItemBasePtr anItem = DFBrowser_Item::CreateItem (currentItem(), theRow, theColumn);
+  DFBrowser_ItemBasePtr aBaseItem = itemDynamicCast<DFBrowser_ItemBase> (anItem);
+  aBaseItem->SetModule (GetModule());
+
+  return anItem;
+}
+
+// =======================================================================
+// function : SetUseAdditionalInfo
+// purpose :
+// =======================================================================
+bool DFBrowser_ItemBase::SetUseAdditionalInfo (const bool theValue)
+{
+  bool aPreviousValue = myIsUseAdditionalInfo;
+  myIsUseAdditionalInfo = theValue;
+  return aPreviousValue;
+}
+