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/ShapeView/ShapeView_OpenFileViewModel.cxx

@@ -0,0 +1,75 @@
+// 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 <ShapeView_OpenFileViewModel.hxx>
+
+#include <QApplication>
+#include <QFileInfo>
+#include <QIcon>
+#include <QPainter>
+
+const int ICON_SIZE = 40;
+// =======================================================================
+// function : paint
+// purpose :
+// =======================================================================
+void ShapeView_OpenFileItemDelegate::paint (QPainter* thePainter, const QStyleOptionViewItem& theOption,
+                                              const QModelIndex& theIndex) const
+{
+  // highlight cell
+  if (theOption.state & QStyle::State_MouseOver)
+    thePainter->fillRect (theOption.rect, myColor);
+
+  // action icon for all indices before the last one
+  QIcon anIcon (":/icons/folder_import.png");
+  QSize anIconSize (ICON_SIZE, ICON_SIZE);
+  int aWidth = theOption.rect.width();
+  int aCenter = aWidth / 2.;
+  int aHalf = anIconSize.width() / 2.;
+  int aMargin = qApp->style()->pixelMetric (QStyle::PM_HeaderMargin);
+  thePainter->drawPixmap (QRect (theOption.rect.left() + (aCenter - aHalf),
+                          theOption.rect.top() + aMargin,
+                          anIconSize.width(),
+                          anIconSize.height()),
+                          anIcon.pixmap(anIconSize.width(), anIconSize.height()));
+  // default paint
+  QItemDelegate::paint (thePainter, theOption, theIndex);
+}
+
+// =======================================================================
+// function : Init
+// purpose :
+// =======================================================================
+void ShapeView_OpenFileViewModel::Init (const QStringList& theValues)
+{
+  myValues = theValues;
+}
+
+// =======================================================================
+// function : data
+// purpose :
+// =======================================================================
+QVariant ShapeView_OpenFileViewModel::data (const QModelIndex& theIndex, int theRole) const
+{
+  switch (theRole)
+  {
+    case Qt::DisplayRole: return QFileInfo (myValues[theIndex.column()]).fileName();
+    case Qt::ToolTipRole: return myValues[theIndex.column()];
+    case Qt::TextAlignmentRole: return QVariant (Qt::AlignBottom | Qt::AlignHCenter);
+    default:
+      break;
+  }
+  return QVariant();
+}