1 files changed, 90 insertions, 0 deletions
diff --git a/generic/tkUndo.h b/generic/tkUndo.h
new file mode 100644
index 0000000..4776b3d
--- /dev/null
+++ b/generic/tkUndo.h
@@ -0,0 +1,90 @@
+/*
+ * tkUndo.h --
+ *
+ *	Declarations shared among the files that implement an undo
+ *	stack.
+ *
+ * Copyright (c) 2002 Ludwig Callewaert.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * RCS: @(#) $Id: tkUndo.h,v 1.1 2002/06/21 23:09:55 hobbs Exp $
+ */
+
+#ifndef _TKUNDO
+#define _TKUNDO
+
+#ifndef _TK
+#include "tk.h"
+#endif
+
+#ifdef BUILD_tk
+# undef TCL_STORAGE_CLASS
+# define TCL_STORAGE_CLASS DLLEXPORT
+#endif
+
+/* enum definining the types used in an undo stack */
+
+typedef enum {
+    TK_UNDO_SEPARATOR,			/* Marker */
+    TK_UNDO_ACTION			   /* Command */
+} TkUndoAtomType;
+
+/* struct defining the basic undo/redo stack element */
+
+typedef struct TkUndoAtom {
+    TkUndoAtomType type;		 /* The type that will trigger the
+					 * required action*/
+    Tcl_Obj * apply;			   /* Command to apply the action that was taken */
+    Tcl_Obj * revert;			/* The command to undo the action */
+    struct TkUndoAtom * next;	/* Pointer to the next element in the
+					 * stack */
+} TkUndoAtom;
+
+/* struct defining the basic undo/redo stack element */
+
+typedef struct TkUndoRedoStack {
+    TkUndoAtom * undoStack;		 /* The undo stack */
+    TkUndoAtom * redoStack;		 /* The redo stack */
+    Tcl_Interp * interp   ;       /* The interpreter in which to execute the revert and apply scripts */
+    int          maxdepth;
+    int          depth;
+} TkUndoRedoStack;
+
+/* basic functions */
+
+EXTERN void TkUndoPushStack  _ANSI_ARGS_((TkUndoAtom ** stack,
+    TkUndoAtom *  elem));
+
+EXTERN TkUndoAtom * TkUndoPopStack _ANSI_ARGS_((TkUndoAtom ** stack));
+ 
+EXTERN int TkUndoInsertSeparator _ANSI_ARGS_((TkUndoAtom ** stack));
+
+EXTERN void TkUndoClearStack _ANSI_ARGS_((TkUndoAtom ** stack));
+
+/* functions working on an undo/redo stack */
+
+EXTERN TkUndoRedoStack * TkUndoInitStack _ANSI_ARGS_((Tcl_Interp * interp,
+    int maxdepth));
+
+EXTERN void TkUndoSetDepth _ANSI_ARGS_((TkUndoRedoStack * stack,
+    int maxdepth));
+
+EXTERN void TkUndoClearStacks _ANSI_ARGS_((TkUndoRedoStack * stack));
+
+EXTERN void TkUndoFreeStack _ANSI_ARGS_((TkUndoRedoStack * stack));
+
+EXTERN void TkUndoInsertUndoSeparator _ANSI_ARGS_((TkUndoRedoStack * stack));
+
+EXTERN void TkUndoPushAction _ANSI_ARGS_((TkUndoRedoStack * stack,
+    Tcl_DString * actionScript, Tcl_DString * revertScript));
+
+EXTERN int TkUndoRevert _ANSI_ARGS_((TkUndoRedoStack *  stack));
+ 
+EXTERN int TkUndoApply _ANSI_ARGS_((TkUndoRedoStack *  stack));
+
+# undef TCL_STORAGE_CLASS
+# define TCL_STORAGE_CLASS DLLIMPORT
+
+#endif /* _TKUNDO */