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Michael R Sweet
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fluid/undo.cxx
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185
fluid/undo.cxx
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//
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// "$Id$"
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//
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// FLUID undo support for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2005 by Bill Spitzak and others.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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#include <FL/Fl.H>
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#include "Fl_Type.h"
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#include "undo.h"
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#include <FL/Fl_Preferences.H>
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#include "../src/flstring.h"
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#if defined(WIN32) && !defined(__CYGWIN__)
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# include <windows.h>
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# define getpid GetCurrentProcessId
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#else
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# include <unistd.h>
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#endif // WIN32 && !__CYGWIN__
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extern Fl_Preferences fluid_prefs; // FLUID preferences
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extern Fl_Menu_Item Main_Menu[]; // Main menu
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#define UNDO_ITEM 23 // Undo menu item index
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#define REDO_ITEM 24 // Redo menu item index
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//
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// This file implements an undo system using temporary files; ideally
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// we'd like to do this in memory, however the current data structures
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// and design aren't well-suited... Instead, we save and restore
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// checkpoint files.
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//
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int undo_current = 0; // Current undo level in buffer
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int undo_last = 0; // Last undo level in buffer
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int undo_max = 0; // Maximum undo level used
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int undo_save = -1; // Last undo level that was saved
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static int undo_paused = 0; // Undo checkpointing paused?
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// Return the undo filename
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static char *undo_filename(int level, char *buf, int bufsize) {
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static char undo_path[1024] = ""; // Undo path
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if (!undo_path[0]) fluid_prefs.getUserdataPath(undo_path, sizeof(undo_path));
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snprintf(buf, bufsize, "%s/undo_%d_%d.fl", undo_path, getpid(), level);
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return buf;
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}
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// Redo menu callback
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void redo_cb(Fl_Widget *, void *) {
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char filename[1024]; // Undo checkpoint file
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if (undo_current >= undo_last) return;
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undo_suspend();
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if (!read_file(undo_filename(undo_current + 1, filename, sizeof(filename)), 0)) {
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// Unable to read checkpoint file, don't redo...
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undo_resume();
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return;
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}
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undo_current ++;
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// Update modified flag...
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set_modflag(undo_current != undo_save);
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// Update undo/redo menu items...
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if (undo_current >= undo_last) Main_Menu[REDO_ITEM].deactivate();
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Main_Menu[UNDO_ITEM].activate();
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}
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// Undo menu callback
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void undo_cb(Fl_Widget *, void *) {
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char filename[1024]; // Undo checkpoint file
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if (undo_current <= 0) return;
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if (undo_current == undo_last) {
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write_file(undo_filename(undo_current, filename, sizeof(filename)));
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}
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undo_suspend();
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if (!read_file(undo_filename(undo_current - 1, filename, sizeof(filename)), 0)) {
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// Unable to read checkpoint file, don't undo...
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undo_resume();
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return;
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}
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undo_current --;
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// Update modified flag...
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set_modflag(undo_current != undo_save);
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// Update undo/redo menu items...
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if (undo_current <= 0) Main_Menu[UNDO_ITEM].deactivate();
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Main_Menu[REDO_ITEM].activate();
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}
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// Save current file to undo buffer
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void undo_checkpoint() {
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char filename[1024]; // Undo checkpoint filename
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printf("undo_checkpoint(): undo_current=%d, undo_paused=%d, modflag=%d\n",
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undo_current, undo_paused, modflag);
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// Don't checkpoint if undo_suspend() has been called...
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if (undo_paused) return;
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// Save the current UI to a checkpoint file...
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if (!write_file(undo_filename(undo_current, filename, sizeof(filename)))) {
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// Don't attempt to do undo stuff if we can't write a checkpoint file...
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perror(filename);
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return;
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}
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// Update the saved level...
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if (modflag && undo_current <= undo_save) undo_save = -1;
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else if (!modflag) undo_save = undo_current;
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// Update the current undo level...
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undo_current ++;
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undo_last = undo_current;
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if (undo_current > undo_max) undo_max = undo_current;
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// Enable the Undo and disable the Redo menu items...
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Main_Menu[UNDO_ITEM].activate();
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Main_Menu[REDO_ITEM].deactivate();
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}
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// Clear undo buffer
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void undo_clear() {
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char filename[1024]; // Undo checkpoint filename
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// Remove old checkpoint files...
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for (int i = 0; i <= undo_max; i ++) {
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unlink(undo_filename(i, filename, sizeof(filename)));
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}
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// Reset current, last, and save indices...
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undo_current = undo_last = undo_max = 0;
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if (modflag) undo_save = -1;
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else undo_save = 0;
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}
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// Resume undo checkpoints
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void undo_resume() {
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undo_paused = 0;
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}
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// Suspend undo checkpoints
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void undo_suspend() {
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undo_paused = 1;
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}
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//
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// End of "$Id$".
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//
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46
fluid/undo.h
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46
fluid/undo.h
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@ -0,0 +1,46 @@
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//
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// "$Id$"
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//
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// FLUID undo definitions for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2005 by Bill Spitzak and others.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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#ifndef undo_h
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# define undo_h
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extern int undo_current; // Current undo level in buffer
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extern int undo_last; // Last undo level in buffer
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extern int undo_save; // Last undo level that was saved
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void redo_cb(Fl_Widget *, void *); // Redo menu callback
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void undo_cb(Fl_Widget *, void *); // Undo menu callback
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void undo_checkpoint(); // Save current file to undo buffer
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void undo_clear(); // Clear undo buffer
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void undo_resume(); // Resume undo checkpoints
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void undo_suspend(); // Suspend undo checkpoints
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#endif // !undo_h
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//
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// End of "$Id$".
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//
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