Restructuring Fluid source files.

1 files changed, 37 insertions, 0 deletions

diff --git a/fluid/app/undo.h b/fluid/app/undo.h
new file mode 100644
index 000000000..e8ffab891
--- /dev/null
+++ b/fluid/app/undo.h
@@ -0,0 +1,37 @@
+//
+// FLUID undo definitions for the Fast Light Tool Kit (FLTK).
+//
+// 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 undo_h
+#define undo_h
+
+class Fl_Widget;
+
+#define kUndoWindowResize 1
+
+extern int undo_current;                // Current undo level in buffer
+extern int undo_last;                   // Last undo level in buffer
+extern int undo_save;                   // Last undo level that was saved
+extern int undo_once_type;              // Suspend further undos of the same type
+
+void redo_cb(Fl_Widget *, void *);      // Redo menu callback
+void undo_cb(Fl_Widget *, void *);      // Undo menu callback
+void undo_checkpoint();                 // Save current file to undo buffer
+int undo_checkpoint_once(int type);     // Save undo buffer once until a different checkpoint type is called
+void undo_clear();                      // Clear undo buffer
+void undo_resume();                     // Resume undo checkpoints
+void undo_suspend();                    // Suspend undo checkpoints
+
+#endif // !undo_h