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/View/View_Viewer.hxx

@@ -0,0 +1,72 @@
+// 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 View_Viewer_H
+#define View_Viewer_H
+
+#include <Aspect_Window.hxx>
+#include <AIS_InteractiveContext.hxx>
+#include <Quantity_Color.hxx>
+#include <Standard_Macro.hxx>
+#include <V3d_Viewer.hxx>
+#include <V3d_View.hxx>
+
+//! \class View_Viewer
+//! \brief It is responsible for context/viewer/view creation and accepting access to:
+class View_Viewer
+{
+public:
+
+  //! Constructor
+  View_Viewer (const Quantity_Color& theColor) : myDefaultColor(theColor) {}
+
+  //! Destructor
+  virtual ~View_Viewer() {}
+
+  //! Returns the view default colors
+  static Quantity_Color DefaultColor() { return Quantity_Color(Quantity_NOC_BLACK); }
+
+  //! Returns the view default colors
+  static Quantity_Color DisabledColor() { return Quantity_Color(195 / 255., 195 / 255., 195 / 255., Quantity_TOC_RGB); }
+
+  //! Creates V3d view
+  Standard_EXPORT void CreateView();
+
+  //! Fills V3d view by the given window
+  //! \param depending on platform it is either WNT_Window or Xw_Window
+  Standard_EXPORT void SetWindow (const Handle(Aspect_Window)& theWindow);
+
+  //! Creates OCC components on the window
+  //! \param theWindowHandle an id of the application window
+  Standard_EXPORT void InitStandardViewer();
+
+  //! Returns an OCC viewer
+  const Handle(V3d_Viewer)& GetViewer() { return myViewer; }
+
+  //! Returns active view
+  const Handle(V3d_View)& GetView() { return myView; }
+
+  //! Returns OCCT context to provide display and selection mechanism
+  const Handle(AIS_InteractiveContext)& GetContext() const { return myContext; }
+
+private:
+
+  Handle(V3d_Viewer) myViewer; //!< the OCCT viewer
+  Handle(V3d_View) myView; //!< the OCCT view window
+  Handle(AIS_InteractiveContext) myContext; //!< OCCT context to provide display and selection mechanism
+  Quantity_Color myDefaultColor; //!< the default color of the viewer
+};
+
+#endif // View_Viewer_H