Fluid: restructuring and rejuvenation of the source code.

* Add classes for application and project
* Removed all globals from Fluid.h
* Extracting args and project history into their own classes
* Moving globals into Application class
* Initialize values inside headers for some classes.
* Undo functionality wrapped in a class inside Project.
* File reader and writer are now linked to a project.
* Avoid global project access
* Nodes (former Types) will be managed by a new Tree class.
* Removed static members (hidden globals) form Node/Fl_Type.
* Adding Tree iterator.
* Use nullptr instead of 0, NULL, or 0L
* Renamed Fl_..._Type to ..._Node, FL_OVERRIDE -> override
* Renaming ..._type to ...::prototype
* Splitting Widget Panel into multiple files.
* Moved callback code into widget panel file.
* Cleaning up Fluid_Image -> Image_asset
* Moving Fd_Snap_Action into new namespace fld::app::Snap_Action etc.
* Moved mergeback into proj folder.
* `enum ID` is now `enum class Type`.

1 files changed, 0 insertions, 265 deletions

diff --git a/fluid/app/undo.cxx b/fluid/app/undo.cxx
deleted file mode 100644
index baef9e717..000000000
--- a/fluid/app/undo.cxx
+++ /dev/null
@@ -1,265 +0,0 @@
-//
-// FLUID undo support 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
-//
-
-#include "app/undo.h"
-
-#include "app/fluid.h"
-#include "app/project.h"
-#include "io/Project_Reader.h"
-#include "io/Project_Writer.h"
-#include "nodes/Fl_Type.h"
-#include "nodes/Fl_Widget_Type.h"
-#include "widgets/Node_Browser.h"
-
-#include <FL/Fl.H>
-#include <FL/Fl_Window.H>
-#include <FL/Fl_Preferences.H>
-#include <FL/Fl_Menu_Bar.H>
-#include <FL/fl_ask.H>
-#include "tools/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.
-//
-
-extern Fl_Window* the_panel;
-
-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?
-int undo_once_type = 0;                 // Suspend further undos of the same type
-
-
-// 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);
-  undo_once_type = 0;
-
-  if (undo_current >= undo_last) {
-    fl_beep();
-    return;
-  }
-
-  undo_suspend();
-  if (widget_browser) {
-    widget_browser->save_scroll_position();
-    widget_browser->new_list();
-  }
-  int reload_panel = (the_panel && the_panel->visible());
-  if (!fld::io::read_file(undo_filename(undo_current + 1), 0)) {
-    // Unable to read checkpoint file, don't redo...
-    widget_browser->rebuild();
-    g_project.update_settings_dialog();
-    undo_resume();
-    return;
-  }
-  if (reload_panel) {
-    for (Fl_Type *t = Fl_Type::first; t; t=t->next) {
-      if (t->is_widget() && t->selected)
-        t->open();
-    }
-  }
-  if (widget_browser) widget_browser->restore_scroll_position();
-
-  undo_current ++;
-
-  // Update modified flag...
-  set_modflag(undo_current != undo_save);
-  widget_browser->rebuild();
-  g_project.update_settings_dialog();
-
-  // Update undo/redo menu items...
-  // if (undo_current >= undo_last) Main_Menu[redo_item].deactivate();
-  // Main_Menu[undo_item].activate();
-  undo_resume();
-}
-
-// 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);
-  undo_once_type = 0;
-
-  if (undo_current <= 0) {
-    fl_beep();
-    return;
-  }
-
-  if (undo_current == undo_last) {
-    fld::io::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.
-  // TODO: make the scroll position part of the .fl project file
-  if (widget_browser) {
-    widget_browser->save_scroll_position();
-    widget_browser->new_list();
-  }
-  int reload_panel = (the_panel && the_panel->visible());
-  if (!fld::io::read_file(undo_filename(undo_current - 1), 0)) {
-    // Unable to read checkpoint file, don't undo...
-    widget_browser->rebuild();
-    g_project.update_settings_dialog();
-    set_modflag(0, 0);
-    undo_resume();
-    return;
-  }
-  if (reload_panel) {
-    for (Fl_Type *t = Fl_Type::first; t; t=t->next) {
-      if (t->is_widget() && t->selected) {
-        t->open();
-        break;
-      }
-    }
-  }
-  // Restore old browser position.
-  // Ideally, we would save the browser position inside 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();
-  g_project.update_settings_dialog();
-  undo_resume();
-}
-
-/**
- \param[in] type set a new type, or set to 0 to clear the once_type without setting a checkpoint
- \return 1 if the checkpoint was set, 0 if this is a repeating event
- */
-int undo_checkpoint_once(int type) {
-  if (type == 0) {
-    undo_once_type = 0;
-    return 0;
-  }
-  if (undo_paused) return 0;
-  if (undo_once_type != type) {
-    undo_checkpoint();
-    undo_once_type = type;
-    return 1;
-  } else {
-    // do not add more checkpoints for the same undo type
-    return 0;
-  }
-}
-
-// Save current file to undo buffer
-void undo_checkpoint() {
-  //  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;
-
-  // int undo_item = main_menubar->find_index(undo_cb);
-  // int redo_item = main_menubar->find_index(redo_cb);
-  undo_once_type = 0;
-
-  // Save the current UI to a checkpoint file...
-  const char *filename = undo_filename(undo_current);
-  if (!fld::io::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--;
-}
-
-// Suspend undo checkpoints
-void undo_suspend() {
-  undo_paused++;
-}