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//
// FLUID undo support for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2021 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
//
#include "undo.h"
#include "fluid.h"
#include "file.h"
#include "Fl_Type.h"
#include "widget_browser.h"
#include <FL/Fl.H>
#include <FL/Fl_Preferences.H>
#include <FL/Fl_Menu_Bar.H>
#include <FL/filename.H>
#include "../src/flstring.h"
#if defined(_WIN32) && !defined(__CYGWIN__)
# include <io.h>
# include <windows.h>
# define getpid (int)GetCurrentProcessId
#else
# include <unistd.h>
#endif // _WIN32 && !__CYGWIN__
//
// This file implements an undo system using temporary files; ideally
// we'd like to do this in memory, however the current data structures
// and design aren't well-suited... Instead, we save and restore
// checkpoint files.
//
int undo_current = 0; // Current undo level in buffer
int undo_last = 0; // Last undo level in buffer
int undo_max = 0; // Maximum undo level used
int undo_save = -1; // Last undo level that was saved
static int undo_paused = 0; // Undo checkpointing paused?
// Return the undo filename.
// The filename is constructed in a static internal buffer and
// this buffer is overwritten by every call of this function.
// The return value is a pointer to this internal string.
static char *undo_filename(int level) {
static char undo_path[FL_PATH_MAX] = ""; // Undo path
static unsigned int undo_path_len = 0; // length w/o filename
if (!undo_path_len) {
fluid_prefs.getUserdataPath(undo_path, sizeof(undo_path));
undo_path_len = (unsigned int)strlen(undo_path);
}
// append filename: "undo_PID_LEVEL.fl"
snprintf(undo_path + undo_path_len,
sizeof(undo_path) - undo_path_len - 1,
"undo_%d_%d.fl", getpid(), level);
return undo_path;
}
// Redo menu callback
void redo_cb(Fl_Widget *, void *) {
int undo_item = main_menubar->find_index(undo_cb);
int redo_item = main_menubar->find_index(redo_cb);
if (undo_current >= undo_last) return;
undo_suspend();
if (!read_file(undo_filename(undo_current + 1), 0)) {
// Unable to read checkpoint file, don't redo...
widget_browser->rebuild();
undo_resume();
return;
}
undo_current ++;
// Update modified flag...
set_modflag(undo_current != undo_save);
widget_browser->rebuild();
// Update undo/redo menu items...
if (undo_current >= undo_last) Main_Menu[redo_item].deactivate();
Main_Menu[undo_item].activate();
}
// Undo menu callback
void undo_cb(Fl_Widget *, void *) {
int undo_item = main_menubar->find_index(undo_cb);
int redo_item = main_menubar->find_index(redo_cb);
if (undo_current <= 0) return;
if (undo_current == undo_last) {
write_file(undo_filename(undo_current));
}
undo_suspend();
// Undo first deletes all widgets which resets the widget_tree browser.
// Save the current scroll position, so we don't scroll back to 0 at undo.
if (widget_browser) widget_browser->save_scroll_position();
if (!read_file(undo_filename(undo_current - 1), 0)) {
// Unable to read checkpoint file, don't undo...
widget_browser->rebuild();
undo_resume();
return;
}
// Restore old browser position.
// Ideally, we would save the browser position insied the undo file.
if (widget_browser) widget_browser->restore_scroll_position();
undo_current --;
// Update modified flag...
set_modflag(undo_current != undo_save);
// Update undo/redo menu items...
if (undo_current <= 0) Main_Menu[undo_item].deactivate();
Main_Menu[redo_item].activate();
widget_browser->rebuild();
undo_resume();
}
// Save current file to undo buffer
void undo_checkpoint() {
int undo_item = main_menubar->find_index(undo_cb);
int redo_item = main_menubar->find_index(redo_cb);
// printf("undo_checkpoint(): undo_current=%d, undo_paused=%d, modflag=%d\n",
// undo_current, undo_paused, modflag);
// Don't checkpoint if undo_suspend() has been called...
if (undo_paused) return;
// Save the current UI to a checkpoint file...
const char *filename = undo_filename(undo_current);
if (!write_file(filename)) {
// Don't attempt to do undo stuff if we can't write a checkpoint file...
perror(filename);
return;
}
// Update the saved level...
if (modflag && undo_current <= undo_save) undo_save = -1;
else if (!modflag) undo_save = undo_current;
// Update the current undo level...
undo_current ++;
undo_last = undo_current;
if (undo_current > undo_max) undo_max = undo_current;
// Enable the Undo and disable the Redo menu items...
Main_Menu[undo_item].activate();
Main_Menu[redo_item].deactivate();
}
// Clear undo buffer
void undo_clear() {
int undo_item = main_menubar->find_index(undo_cb);
int redo_item = main_menubar->find_index(redo_cb);
// Remove old checkpoint files...
for (int i = 0; i <= undo_max; i ++) {
fl_unlink(undo_filename(i));
}
// Reset current, last, and save indices...
undo_current = undo_last = undo_max = 0;
if (modflag) undo_save = -1;
else undo_save = 0;
// Disable the Undo and Redo menu items...
Main_Menu[undo_item].deactivate();
Main_Menu[redo_item].deactivate();
}
// Resume undo checkpoints
void undo_resume() {
undo_paused = 0;
}
// Suspend undo checkpoints
void undo_suspend() {
undo_paused = 1;
}
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