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, 190 insertions, 0 deletions

diff --git a/fluid/app/Menu.cxx b/fluid/app/Menu.cxx
new file mode 100644
index 000000000..044cc29a7
--- /dev/null
+++ b/fluid/app/Menu.cxx
@@ -0,0 +1,190 @@
+//
+// Application Main Menu code 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/Menu.h"
+
+#include "Fluid.h"
+
+#include "proj/undo.h"
+#include "app/templates.h"
+#include "nodes/Node.h"
+#include "nodes/Group_Node.h"
+#include "nodes/Window_Node.h"
+#include "nodes/factory.h"
+#include "panels/codeview_panel.h"
+#include "app/shell_command.h"
+
+#include <FL/Fl_Menu_Bar.H>
+
+// In Snap_Action.h
+extern void layout_suite_marker(Fl_Widget *, void *user_data);
+extern void select_layout_preset_cb(Fl_Widget *, void *user_data);
+extern Fl_Menu_Item main_layout_submenu_[];
+
+using namespace fld;
+
+
+void write_cb(Fl_Widget *, void *) {
+   Fluid.write_code_files();
+}
+void openwidget_cb(Fl_Widget *, void *) { Fluid.edit_selected(); }
+void copy_cb(Fl_Widget*, void*) { Fluid.copy_selected(); }
+void cut_cb(Fl_Widget *, void *) { Fluid.cut_selected(); }
+void delete_cb(Fl_Widget *, void *) { Fluid.delete_selected(); }
+void paste_cb(Fl_Widget*, void*) { Fluid.paste_from_clipboard(); }
+void duplicate_cb(Fl_Widget*, void*) { Fluid.duplicate_selected(); }
+static void sort_cb(Fl_Widget *,void *) { Fluid.sort_selected(); }
+void about_cb(Fl_Widget *, void *) { Fluid.about(); }
+void help_cb(Fl_Widget *, void *) {
+  Fluid.show_help("fluid.html");
+}
+static void save_template_cb(Fl_Widget *, void *) { fld::app::save_template(); }
+
+void manual_cb(Fl_Widget *, void *) {
+  Fluid.show_help("index.html");
+}
+
+static void menu_file_new_cb(Fl_Widget *, void *) { Fluid.new_project(); }
+static void menu_file_new_from_template_cb(Fl_Widget *, void *) { Fluid.new_project_from_template(); }
+static void menu_file_open_cb(Fl_Widget *, void *) { Fluid.open_project_file(""); }
+static void menu_file_insert_cb(Fl_Widget *, void *) { Fluid.merge_project_file(""); }
+void menu_file_save_cb(Fl_Widget *, void *arg) { Fluid.save_project_file(arg); }
+static void menu_file_print_cb(Fl_Widget *, void *arg) { Fluid.print_snapshots(); }
+void menu_file_open_history_cb(Fl_Widget *, void *v) { Fluid.open_project_file(std::string((const char*)v)); }
+static void menu_layout_sync_resize_cb(Fl_Menu_ *m, void*) {
+ if (m->mvalue()->value()) Fluid.proj.tree.allow_layout = 1; else Fluid.proj.tree.allow_layout = 0; 
+}
+static void menu_file_revert_cb(Fl_Widget *, void *) { Fluid.revert_project(); }
+void exit_cb(Fl_Widget *,void *) { Fluid.quit(); }
+static void write_strings_cb(Fl_Widget *, void *) { Fluid.proj.write_strings(); }
+void toggle_widgetbin_cb(Fl_Widget *, void *) { Fluid.toggle_widget_bin(); }
+/**
+ This is the main Fluid menu.
+
+ Design history is manipulated right inside this menu structure.
+ Some menu items change or deactivate correctly, but most items just trigger
+ various callbacks.
+
+ \c New_Menu creates new widgets and is explained in detail in another location.
+
+ \see New_Menu
+ \todo This menu needs some major modernization. Menus are too long and their
+    sorting is not always obvious.
+ \todo Shortcuts are all over the place (Alt, Ctrl, Command, Shift-Ctrl,
+    function keys), and there should be a help page listing all shortcuts.
+ */
+Fl_Menu_Item Application::main_menu[] = {
+  {"&File",0,nullptr,nullptr,FL_SUBMENU},
+  {"&New", FL_COMMAND+'n', menu_file_new_cb},
+  {"&Open...", FL_COMMAND+'o', menu_file_open_cb},
+  {"&Insert...", FL_COMMAND+'i', menu_file_insert_cb, nullptr, FL_MENU_DIVIDER},
+  {"&Save", FL_COMMAND+'s', menu_file_save_cb, nullptr},
+  {"Save &As...", FL_COMMAND+FL_SHIFT+'s', menu_file_save_cb, (void*)1},
+  {"Sa&ve A Copy...", 0, menu_file_save_cb, (void*)2},
+  {"&Revert...", 0, menu_file_revert_cb, nullptr, FL_MENU_DIVIDER},
+  {"New &From Template...", FL_COMMAND+'N', menu_file_new_from_template_cb, nullptr},
+  {"Save As &Template...", 0, save_template_cb, nullptr, FL_MENU_DIVIDER},
+  {"&Print...", FL_COMMAND+'p', menu_file_print_cb},
+  {"Write &Code", FL_COMMAND+FL_SHIFT+'c', write_cb, nullptr},
+// Matt: disabled {"MergeBack Code", FL_COMMAND+FL_SHIFT+'m', mergeback_cb, 0},
+  {"&Write Strings", FL_COMMAND+FL_SHIFT+'w', write_strings_cb, nullptr, FL_MENU_DIVIDER},
+  {Fluid.history.relpath[0], FL_COMMAND+'1', menu_file_open_history_cb, Fluid.history.abspath[0]},
+  {Fluid.history.relpath[1], FL_COMMAND+'2', menu_file_open_history_cb, Fluid.history.abspath[1]},
+  {Fluid.history.relpath[2], FL_COMMAND+'3', menu_file_open_history_cb, Fluid.history.abspath[2]},
+  {Fluid.history.relpath[3], FL_COMMAND+'4', menu_file_open_history_cb, Fluid.history.abspath[3]},
+  {Fluid.history.relpath[4], FL_COMMAND+'5', menu_file_open_history_cb, Fluid.history.abspath[4]},
+  {Fluid.history.relpath[5], FL_COMMAND+'6', menu_file_open_history_cb, Fluid.history.abspath[5]},
+  {Fluid.history.relpath[6], FL_COMMAND+'7', menu_file_open_history_cb, Fluid.history.abspath[6]},
+  {Fluid.history.relpath[7], FL_COMMAND+'8', menu_file_open_history_cb, Fluid.history.abspath[7]},
+  {Fluid.history.relpath[8], FL_COMMAND+'9', menu_file_open_history_cb, Fluid.history.abspath[8]},
+  {Fluid.history.relpath[9], 0, menu_file_open_history_cb, Fluid.history.abspath[9], FL_MENU_DIVIDER},
+  {"&Quit", FL_COMMAND+'q', exit_cb},
+  {nullptr},
+  {"&Edit",0,nullptr,nullptr,FL_SUBMENU},
+  {"&Undo", FL_COMMAND+'z', fld::proj::Undo::undo_cb},
+  {"&Redo", FL_COMMAND+FL_SHIFT+'z', fld::proj::Undo::redo_cb, nullptr, FL_MENU_DIVIDER},
+  {"C&ut", FL_COMMAND+'x', cut_cb},
+  {"&Copy", FL_COMMAND+'c', copy_cb},
+  {"&Paste", FL_COMMAND+'v', paste_cb},
+  {"Dup&licate", FL_COMMAND+'u', duplicate_cb},
+  {"&Delete", FL_Delete, delete_cb, nullptr, FL_MENU_DIVIDER},
+  {"Select &All", FL_COMMAND+'a', select_all_cb},
+  {"Select &None", FL_COMMAND+FL_SHIFT+'a', select_none_cb, nullptr, FL_MENU_DIVIDER},
+  {"Pr&operties...", FL_F+1, openwidget_cb},
+  {"&Sort",0,sort_cb},
+  {"&Earlier", FL_F+2, earlier_cb},
+  {"&Later", FL_F+3, later_cb},
+  {"&Group", FL_F+7, group_cb},
+  {"Ung&roup", FL_F+8, ungroup_cb,nullptr, FL_MENU_DIVIDER},
+  {"Hide O&verlays",FL_COMMAND+FL_SHIFT+'o',toggle_overlays},
+  {"Hide Guides",FL_COMMAND+FL_SHIFT+'g',toggle_guides},
+  {"Hide Restricted",FL_COMMAND+FL_SHIFT+'r',toggle_restricted},
+  {"Show Widget &Bin...",FL_ALT+'b',toggle_widgetbin_cb},
+  {"Show Code View",FL_ALT+'c', (Fl_Callback*)toggle_codeview_cb, nullptr, FL_MENU_DIVIDER},
+  {"Settings...",FL_ALT+'p',show_settings_cb},
+  {nullptr},
+  {"&New", 0, nullptr, (void *)New_Menu, FL_SUBMENU_POINTER},
+  {"&Layout",0,nullptr,nullptr,FL_SUBMENU},
+  {"&Align",0,nullptr,nullptr,FL_SUBMENU},
+    {"&Left",0,(Fl_Callback *)align_widget_cb,(void*)10},
+    {"&Center",0,(Fl_Callback *)align_widget_cb,(void*)11},
+    {"&Right",0,(Fl_Callback *)align_widget_cb,(void*)12},
+    {"&Top",0,(Fl_Callback *)align_widget_cb,(void*)13},
+    {"&Middle",0,(Fl_Callback *)align_widget_cb,(void*)14},
+    {"&Bottom",0,(Fl_Callback *)align_widget_cb,(void*)15},
+  {nullptr},
+  {"&Space Evenly",0,nullptr,nullptr,FL_SUBMENU},
+    {"&Across",0,(Fl_Callback *)align_widget_cb,(void*)20},
+    {"&Down",0,(Fl_Callback *)align_widget_cb,(void*)21},
+  {nullptr},
+  {"&Make Same Size",0,nullptr,nullptr,FL_SUBMENU},
+    {"&Width",0,(Fl_Callback *)align_widget_cb,(void*)30},
+    {"&Height",0,(Fl_Callback *)align_widget_cb,(void*)31},
+    {"&Both",0,(Fl_Callback *)align_widget_cb,(void*)32},
+  {nullptr},
+  {"&Center In Group",0,nullptr,nullptr,FL_SUBMENU},
+    {"&Horizontal",0,(Fl_Callback *)align_widget_cb,(void*)40},
+    {"&Vertical",0,(Fl_Callback *)align_widget_cb,(void*)41},
+  {nullptr},
+  {"Synchronized Resize", 0, (Fl_Callback*)menu_layout_sync_resize_cb, nullptr, FL_MENU_TOGGLE|FL_MENU_DIVIDER },
+  {"&Grid and Size Settings...",FL_COMMAND+'g',show_grid_cb, nullptr, FL_MENU_DIVIDER},
+  {"Presets", 0, layout_suite_marker, (void*)main_layout_submenu_, FL_SUBMENU_POINTER },
+  {"Application", 0, select_layout_preset_cb, (void*)nullptr, FL_MENU_RADIO|FL_MENU_VALUE },
+  {"Dialog",      0, select_layout_preset_cb, (void*)1, FL_MENU_RADIO },
+  {"Toolbox",     0, select_layout_preset_cb, (void*)2, FL_MENU_RADIO },
+  {nullptr},
+{"&Shell", 0, Fd_Shell_Command_List::menu_marker, (void*)Fd_Shell_Command_List::default_menu, FL_SUBMENU_POINTER},
+  {"&Help",0,nullptr,nullptr,FL_SUBMENU},
+  {"&Rapid development with FLUID...",0,help_cb},
+  {"&FLTK Programmers Manual...",0,manual_cb, nullptr, FL_MENU_DIVIDER},
+  {"&About FLUID...",0,about_cb},
+  {nullptr},
+{nullptr}};
+
+/**
+Show or hide the code preview window.
+*/
+void toggle_codeview_cb(Fl_Double_Window *, void *) {
+ codeview_toggle_visibility();
+}
+
+/**
+Show or hide the code preview window, button callback.
+*/
+void toggle_codeview_b_cb(Fl_Button*, void *) {
+ codeview_toggle_visibility();
+}
+