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_TreeLevelLineModel.hxx

@@ -0,0 +1,85 @@
+// 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. 
+
+#ifndef DFBrowser_TreeLevelLineModel_H
+#define DFBrowser_TreeLevelLineModel_H
+
+#include <Standard.hxx>
+#include <TreeModel_ItemBase.hxx>
+
+#include <QAbstractTableModel>
+#include <QObject>
+#include <QList>
+
+//! \class DFBrowser_TreeLevelLineModel
+//! Tree Model of tree line items. It is initialized by OCAF tree model index. Each element of the current model
+//! is an item of hierarchy of OCAF tree model index. So, on each level a label is presented, the last element may be
+//! an attribute. Information, presented for the item has no additional information (not as in OCAF tree model)
+class DFBrowser_TreeLevelLineModel : public QAbstractTableModel
+{
+public:
+
+  //! Constructor
+  DFBrowser_TreeLevelLineModel (QObject* theParent = 0) : QAbstractTableModel (theParent) {}
+
+  //! Destructor
+  virtual ~DFBrowser_TreeLevelLineModel() {}
+
+  //!
+  void Reset() { myLevelItems.clear(); }
+
+  //! Inits the model by the index
+  //! \param theTreeIndex an OCAF tree model index
+  Standard_EXPORT void Init (const QModelIndex& theTreeIndex);
+
+  //! Returns true if the tree model index is filled
+  bool IsInitialized() const { return myTreeIndex.isValid(); }
+
+  //! Return OCAF tree view model index on level defined by column of the parameter index
+  //! \param theIndex a tree level view model index
+  //! \return model index
+  const QModelIndex& GetTreeViewIndex (const QModelIndex& theIndex) const
+  { return myLevelItems[theIndex.column()]; }
+
+  //! Returns item information(short) for display role.
+  //! \param theIndex a model index
+  //! \param theRole a view role
+  //! \return value intepreted depending on the given role
+  Standard_EXPORT virtual QVariant data (const QModelIndex& theIndex,
+                                         int theRole = Qt::DisplayRole) const Standard_OVERRIDE;
+
+  //! Returns the header data for the given role and section in the header with the specified orientation.
+  //! \param theSection the header section. For horizontal headers - column number, for vertical headers - row number.
+  //! \param theOrientation a header orientation
+  //! \param theRole a data role
+  //! \return the header data
+  Standard_EXPORT virtual QVariant headerData (int theSection, Qt::Orientation theOrientation,
+                                               int theRole = Qt::DisplayRole) const Standard_OVERRIDE;
+
+  //! Returns number of tree level line items = colums in table view
+  virtual int columnCount (const QModelIndex& theParent = QModelIndex()) const Standard_OVERRIDE
+  { (void)theParent; return myLevelItems.size(); }
+
+  //! Returns onlly one row in table view
+  virtual int rowCount (const QModelIndex& theParent = QModelIndex()) const Standard_OVERRIDE
+  { (void)theParent; return 1; }
+
+private:
+
+  QModelIndex myTreeIndex; //!< the current OCAF tree view model index
+  QList<QModelIndex> myLevelItems; //! cached parent indices of myTreeIndex for quick access to item information
+};
+
+#endif