add (text) file viewer class

tools/lammps-gui/fileviewer.h

@@ -0,0 +1,39 @@
+/* -*- c++ -*- ----------------------------------------------------------
+   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
+   https://www.lammps.org/, Sandia National Laboratories
+   LAMMPS development team: developers@lammps.org
+
+   Copyright (2003) Sandia Corporation.  Under the terms of Contract
+   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
+   certain rights in this software.  This software is distributed under
+   the GNU General Public License.
+
+   See the README file in the top-level LAMMPS directory.
+------------------------------------------------------------------------- */
+
+#ifndef FILEVIEWER_H
+#define FILEVIEWER_H
+
+#include <QPlainTextEdit>
+
+class FileViewer : public QPlainTextEdit {
+    Q_OBJECT
+
+public:
+    FileViewer(const QString &filename, QWidget *parent = nullptr);
+
+private slots:
+    void quit();
+    void stop_run();
+
+protected:
+    bool eventFilter(QObject *watched, QEvent *event) override;
+
+private:
+    QString fileName;
+};
+
+#endif
+// Local Variables:
+// c-basic-offset: 4
+// End: