--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgui/src/qt-application.h	Sat Jun 22 17:30:16 2019 -0500
@@ -0,0 +1,70 @@
+/*
+
+Copyright (C) 2012-2019 John W. Eaton
+
+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
+<https://www.gnu.org/licenses/>.
+
+*/
+
+#if ! defined (octave_octave_gui_h)
+#define octave_octave_gui_h 1
+
+#include "octave.h"
+
+namespace octave
+{
+  // Programming Note: This file must not include any Qt headers.  Any
+  // Qt header files required by the qt_application::execute function
+  // must be included only in the corresponding .cc file.
+
+  //! This class inherits from the pure-virtual base class
+  //! octave::application and provides an implementation of the
+  //! application::execute method that starts an interface to Octave
+  //! that is based on Qt.  It may start a command-line interface that
+  //! allows Qt graphics to be used or it may start an interface that
+  //! provides the full GUI experience.
+
+  class OCTGUI_API qt_application  : public application
+  {
+  public:
+
+    qt_application (int argc, char **argv);
+
+    // No copying, at least not yet.
+
+    qt_application (const qt_application&) = delete;
+
+    qt_application& operator = (const qt_application&) = delete;
+
+    ~qt_application (void) = default;
+
+    // Should we start the GUI or fall back to the CLI?
+    bool start_gui_p (void) const;
+
+    int execute (void);
+
+    bool gui_running (void) const { return m_gui_running; }
+    void gui_running (bool arg) { m_gui_running = arg; }
+
+  private:
+
+    // If TRUE, the GUI should be started.
+    bool m_gui_running = false;
+  };
+}
+
+#endif