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diff --git a/fluid/widgets/Code_Viewer.h b/fluid/widgets/Code_Viewer.h
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+//
+// Code editor widget for the Fast Light Tool Kit (FLTK).
+// Syntax highlighting rewritten by erco@seriss.com 09/15/20.
+//
+// Copyright 1998-2025 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     https://www.fltk.org/COPYING.php
+//
+// Please see the following page on how to report bugs and issues:
+//
+//     https://www.fltk.org/bugs.php
+//
+
+#ifndef FLUID_WIDGETS_CODE_VIEWER_H
+#define FLUID_WIDGETS_CODE_VIEWER_H
+
+//
+// Include necessary headers...
+//
+
+#include "widgets/Code_Editor.h"
+
+namespace fld {
+namespace widget {
+
+/**
+ A widget derived from Code_Editor with highlighting for code blocks.
+
+ This widget is used by the codeview system to show the design's
+ source and header code. The secondary highlighting show the text
+ part that corresponds to the selected widget(s).
+ */
+class Code_Viewer : public Code_Editor {
+public:
+  Code_Viewer(int X, int Y, int W, int H, const char *L = nullptr);
+
+protected:
+  void draw() override;
+
+  /// Limit event handling to viewing, not editing
+  int handle(int ev) override { return Fl_Text_Display::handle(ev); }
+};
+
+} // namespace widget
+} // namespace fld
+
+#endif // FLUID_WIDGETS_CODE_VIEWER_H