--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgui/src/m-editor/octave-qscintilla.cc	Fri Jun 07 23:13:48 2013 +0200
@@ -0,0 +1,87 @@
+/*
+
+Copyright (C) 2013 Torsten <ttl@justmail.de>
+
+This file is part of Octave.
+
+Octave is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+Octave is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Octave; see the file COPYING.  If not, see
+<http://www.gnu.org/licenses/>.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef HAVE_QSCINTILLA
+
+#include "octave-qscintilla.h"
+#include "file-editor-tab.h"
+
+octave_qscintilla::octave_qscintilla (QWidget *p)
+    : QsciScintilla (p)
+{ }
+
+octave_qscintilla::~octave_qscintilla ()
+{ }
+
+
+// context menu requested
+void
+octave_qscintilla::contextMenuEvent (QContextMenuEvent *e)
+{
+  QMenu *context_menu = createStandardContextMenu ( );  // standard menu
+
+  context_menu->addSeparator ();   // separator before custom entries
+
+  // help menu: get the position of the mouse or the text cursor
+  _word_at_cursor = "";
+  QPoint global_pos = e->globalPos ();            // global mouse position
+
+  if (e->reason () == QContextMenuEvent::Mouse)   // context menu by mouse
+    _word_at_cursor = wordAtPoint (e->pos ());
+  else
+    { // context menu by keyboard or other: get point of text cursor
+      long position = SendScintilla (QsciScintillaBase::SCI_GETCURRENTPOS);
+      long point_x  = SendScintilla
+                        (QsciScintillaBase::SCI_POINTXFROMPOSITION,0,position);
+      long point_y  = SendScintilla
+                        (QsciScintillaBase::SCI_POINTYFROMPOSITION,0,position);
+      QPoint local_pos = QPoint (point_x,point_y);  // local position of cursor
+      global_pos = mapToGlobal (local_pos); // global position of cursor
+      QRect editor_rect = geometry ();      // get editor rect and map to global
+      editor_rect.moveTopLeft(parentWidget()->mapToGlobal(editor_rect.topLeft()));
+      if (editor_rect.contains (global_pos))  // is cursor within editor?
+        _word_at_cursor = wordAtPoint (local_pos);
+      else
+        global_pos = editor_rect.topLeft ();
+    }
+  // finally create the menu entry if a word at cursor was found
+  if (!_word_at_cursor.isEmpty ())
+    context_menu->addAction (tr ("help") + " " + _word_at_cursor,
+                             this, SLOT (contextmenu_help (bool)));
+
+  context_menu->exec (global_pos);
+}
+
+
+// handle the menu entry for calling help
+void
+octave_qscintilla::contextmenu_help (bool)
+{
+  QString command = "help " + _word_at_cursor;
+  emit execute_command_in_terminal_signal (command);
+}
+
+#endif