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//
// Fluid Undo header 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
#include <FL/filename.H>
class Fl_Widget;
class Project;
enum {
FLD_UNDO_ONCETYPE_ALWAYS = 0,
FLD_UNDO_ONCETYPE_WINDOW_RESIZE
};
class Undo
{
public:
typedef int OnceType;
/// Link Undo class to this project.
Project &proj_;
/// Current undo level in buffer
int current_ = 0;
/// Last undo level in buffer
int last_ = 0;
// Maximum undo level used
int max_ = 0;
/// Last undo level that was saved
int save_ = -1;
// Undo checkpointing paused?
int paused_ = 0;
// Undo file path
char path_[FL_PATH_MAX] { };
// length w/o filename
unsigned int path_len_ = 0;
/// Suspend further undos of the same type
OnceType once_type_ = FLD_UNDO_ONCETYPE_ALWAYS;
public:
// Constructor.
Undo(Project &p);
// Destructor.
~Undo();
// Save current file to undo buffer
void checkpoint();
// Save undo buffer once until a different checkpoint type is called
int checkpoint(OnceType type);
// Clear undo buffer
void clear();
// Resume undo checkpoints
void resume();
// Suspend undo checkpoints
void suspend();
// Return the undo filename.
char *filename(int level);
// Redo menu callback
void redo();
// Undo menu callback
void undo();
// Redo menu callback
static void redo_cb(Fl_Widget *, void *);
// Undo menu callback
static void undo_cb(Fl_Widget *, void *);
};
#endif // !undo_h
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