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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@4144 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

2 files changed, 231 insertions, 0 deletions

diff --git a/fluid/undo.cxx b/fluid/undo.cxx
new file mode 100644
index 000000000..a66bf80dd
--- /dev/null
+++ b/fluid/undo.cxx
@@ -0,0 +1,185 @@
+//
+// "$Id$"
+//
+// FLUID undo support for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2005 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+#include <FL/Fl.H>
+#include "Fl_Type.h"
+#include "undo.h"
+#include <FL/Fl_Preferences.H>
+#include "../src/flstring.h"
+#if defined(WIN32) && !defined(__CYGWIN__)
+#  include <windows.h>
+#  define getpid GetCurrentProcessId
+#else
+#  include <unistd.h>
+#endif // WIN32 && !__CYGWIN__
+
+
+extern Fl_Preferences	fluid_prefs;	// FLUID preferences
+extern Fl_Menu_Item	Main_Menu[];	// Main menu
+
+#define UNDO_ITEM	23		// Undo menu item index
+#define REDO_ITEM	24		// Redo menu item index
+
+
+//
+// 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
+static char *undo_filename(int level, char *buf, int bufsize) {
+  static char	undo_path[1024] = "";	// Undo path
+
+
+  if (!undo_path[0]) fluid_prefs.getUserdataPath(undo_path, sizeof(undo_path));
+
+  snprintf(buf, bufsize, "%s/undo_%d_%d.fl", undo_path, getpid(), level);
+  return buf;
+}
+
+
+// Redo menu callback
+void redo_cb(Fl_Widget *, void *) {
+  char	filename[1024];			// Undo checkpoint file
+
+  if (undo_current >= undo_last) return;
+
+  undo_suspend();
+  if (!read_file(undo_filename(undo_current + 1, filename, sizeof(filename)), 0)) {
+    // Unable to read checkpoint file, don't redo...
+    undo_resume();
+    return;
+  }
+
+  undo_current ++;
+
+  // Update modified flag...
+  set_modflag(undo_current != undo_save);
+
+  // 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 *) {
+  char	filename[1024];			// Undo checkpoint file
+
+  if (undo_current <= 0) return;
+
+  if (undo_current == undo_last) {
+    write_file(undo_filename(undo_current, filename, sizeof(filename)));
+  }
+
+  undo_suspend();
+  if (!read_file(undo_filename(undo_current - 1, filename, sizeof(filename)), 0)) {
+    // Unable to read checkpoint file, don't undo...
+    undo_resume();
+    return;
+  }
+
+  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();
+}
+
+// Save current file to undo buffer
+void undo_checkpoint() {
+  char	filename[1024];			// Undo checkpoint filename
+
+  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...
+  if (!write_file(undo_filename(undo_current, filename, sizeof(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() {
+  char	filename[1024];			// Undo checkpoint filename
+
+
+  // Remove old checkpoint files...
+  for (int i = 0; i <= undo_max; i ++) {
+    unlink(undo_filename(i, filename, sizeof(filename)));
+  }
+
+  // Reset current, last, and save indices...
+  undo_current = undo_last = undo_max = 0;
+  if (modflag) undo_save = -1;
+  else undo_save = 0;
+}
+
+// Resume undo checkpoints
+void undo_resume() {
+  undo_paused = 0;
+}
+
+// Suspend undo checkpoints
+void undo_suspend() {
+  undo_paused = 1;
+}
+
+
+//
+// End of "$Id$".
+//
diff --git a/fluid/undo.h b/fluid/undo.h
new file mode 100644
index 000000000..949f150e5
--- /dev/null
+++ b/fluid/undo.h
@@ -0,0 +1,46 @@
+//
+// "$Id$"
+//
+// FLUID undo definitions for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2005 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+#ifndef undo_h
+#  define undo_h
+
+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
+
+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
+void undo_clear();			// Clear undo buffer
+void undo_resume();			// Resume undo checkpoints
+void undo_suspend();			// Suspend undo checkpoints
+
+#endif // !undo_h
+
+//
+// End of "$Id$".
+//