path: root/fluid/Fluid.cxx

//
// Fluid Application 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 "Fluid.h"

#include "Project.h"
#include "proj/mergeback.h"
#include "app/Menu.h"
#include "app/shell_command.h"
#include "app/Snap_Action.h"
#include "proj/undo.h"
#include "io/Project_Reader.h"
#include "io/Project_Writer.h"
#include "io/Code_Writer.h"
#include "nodes/Node.h"
#include "nodes/Function_Node.h"
#include "nodes/Group_Node.h"
#include "nodes/Window_Node.h"
#include "nodes/factory.h"
#include "panels/settings_panel.h"
#include "panels/function_panel.h"
#include "panels/codeview_panel.h"
#include "panels/template_panel.h"
#include "panels/about_panel.h"
#include "rsrcs/pixmaps.h"
#include "tools/autodoc.h"
#include "widgets/App_Menu_Bar.h"
#include "widgets/Node_Browser.h"

#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/fl_ask.H>
#include <FL/Fl_Help_Dialog.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/Fl_Native_File_Chooser.H>
#include <FL/Fl_Printer.H>
#include <FL/Fl_File_Icon.H>
#include <FL/fl_string_functions.h>

#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "../src/flstring.h"

#ifdef __APPLE__
#include <FL/platform.H>
#endif

#ifndef _WIN32
#include <unistd.h>
#endif


Application Fluid;


/**
 Timer to watch for external editor modifications.
 */
static void external_editor_timer(void*) {
  int editors_open = ExternalCodeEditor::editors_open();
  if (Fluid.debug_external_editor) printf("--- TIMER --- External editors open=%d\n", editors_open);
  if (editors_open > 0) {
    int modified = 0;
    for (Node *p: Fluid.proj.tree.all_nodes()) {
      if (p->is_a(FLD_NODE_TYPE_Code)) {
        Code_Node *code = static_cast<Code_Node*>(p);
        if (code->handle_editor_changes()) {
          modified++;
        }
        if (code->is_editing()) {
          code->reap_editor();
        }
      }
    }
    if (modified) Fluid.proj.set_modflag(1);
  }
  if (ExternalCodeEditor::editors_open()) {
    Fl::repeat_timeout(2.0, external_editor_timer);
  }
}


/**
 Create the Fluid application.
 */
Application::Application()
: current_project_(new Project()),
  tmpdir_create_called(0),
  preferences(Fl_Preferences::USER_L, "fltk.org", "fluid"),
  layout_list(0),
  batch_mode(0),
  show_guides(1),
  show_restricted(1),
  show_ghosted_outline(1),
  show_comments(1),
  use_external_editor(0),
  debug_external_editor(0),
  main_window(0),
  main_menubar(0),
  save_item(0),
  history_item(0),
  widgetbin_item(0),
  codeview_item(0),
  overlay_item(0),
  overlay_button(0),
  guides_item(0),
  restricted_item(0),
  pasteoffset(0),
  ipasteoffset(0),
  help_dialog(0),
  proj(*current_project_)
{
  launch_path_[0] = '\0';
  tmpdir_path_[0] = '\0';
  external_editor_command[0] = '\0';
}


/**
 Destructor.
 */
Application::~Application() {
  delete current_project_;
}


/**
 Start Fluid.
 */
int Application::run(int argc, char **argv) {
  setlocale(LC_ALL, "");
  setlocale(LC_NUMERIC, "C");

  // store the current path at launch
  fl_getcwd(launch_path_, FL_PATH_MAX);
  fld_end_with_slash(launch_path_, FL_PATH_MAX, launch_path_);

  int i = 1;
  if ((i = args.load(argc, argv)) == -1)
    return 1;

  if (args.show_version) {
    printf("fluid v%d.%d.%d\n", FL_MAJOR_VERSION, FL_MINOR_VERSION, FL_PATCH_VERSION);
    ::exit(0);
  }

  const char *c = 0;
  if (args.autodoc_path[0] == '\0')
    c = argv[i];

  fl_register_images();

  make_main_window();

  if (c) {
    if (batch_mode) {
      proj.set_filename(c);
    } else {
      char abs_path[FL_PATH_MAX];
      fl_filename_absolute(abs_path, FL_PATH_MAX, c);
      proj.set_filename(abs_path);
    }
  }
  if (!batch_mode) {
#ifdef __APPLE__
    fl_open_callback(apple_open_cb);
#endif
    Fl::visual((Fl_Mode)(FL_DOUBLE|FL_INDEX));
    Fl_File_Icon::load_system_icons();
    main_window->callback(exit_cb);
    position_window(main_window, "main_window_pos", 1, 10, 30, FLD_WINWIDTH, FLD_WINHEIGHT);
    if (g_shell_config) {
      g_shell_config->read(preferences, FLD_TOOL_STORE_USER);
      g_shell_config->update_settings_dialog();
      g_shell_config->rebuild_shell_menu();
    }
    layout_list->read(preferences, FLD_TOOL_STORE_USER);
    main_window->show(argc, argv);
    toggle_widget_bin();
    toggle_codeview_cb(0, 0);
    if (!c && openlast_button->value() && history.abspath[0][0] && args.autodoc_path[0] == '\0') {
      open_project_file(history.abspath[0]);
    }
  }
  proj.undo.suspend();
  if (c && !read_file(proj, c, 0)) {
    if (batch_mode) {
      fprintf(stderr, "%s : %s\n", c, strerror(errno));
      exit(1);
    }
    fl_message("Can't read %s: %s", c, strerror(errno));
  }
  proj.undo.resume();

  if (batch_mode) {
    if (args.code_filename[0]) {
      proj.code_file_set = 1;
      proj.set_code_file_name(args.code_filename);
    }
    if (args.header_filename[0]) {
      proj.header_file_set = 1;
      proj.set_header_file_name(args.header_filename);
    }
  }

  if (args.update_file) {
    write_file(proj, c, 0);
    if (!args.compile_file)
      exit(0);
  }

  if (args.compile_file) {
    if (args.compile_strings)
      proj.write_strings();
    write_code_files(0);
    exit(0);
  }

  if (batch_mode)
    exit(0);

  proj.set_modflag(0);
  proj.undo.clear();

  ExternalCodeEditor::set_update_timer_callback(external_editor_timer);

#ifndef NDEBUG
  if (args.autodoc_path[0]) {
    run_autodoc(args.autodoc_path);
    proj.set_modflag(0, 0);
    quit();
    return 0;
  }
#endif

  start_auto_mergeback();
  Fl::run();

  proj.undo.clear();
  return 0;
}


/**
 Exit Fluid.
 */
void Application::quit() {
  if (shell_command_running()) {
    int choice = fl_choice("Previous shell command still running!",
                           "Cancel", "Exit", 0);
    if (choice == 0) return;
  }

  flush_text_widgets();

  if (confirm_project_clear() == 0)
    return;

  ExternalCodeEditor::stop_update_timer();

  save_position(main_window, "main_window_pos");

  if (widgetbin_panel) {
    save_position(widgetbin_panel, "widgetbin_pos");
    delete widgetbin_panel;
  }
  if (codeview_panel) {
    Fl_Preferences svp(preferences, "codeview");
    svp.set("autorefresh", cv_autorefresh->value());
    svp.set("autoposition", cv_autoposition->value());
    svp.set("tab", cv_tab->find(cv_tab->value()));
    svp.set("code_choice", cv_code_choice);
    save_position(codeview_panel, "codeview_pos");
    delete codeview_panel;
    codeview_panel = 0;
  }
  if (shell_run_window) {
    save_position(shell_run_window, "shell_run_Window_pos");
  }

  if (about_panel)
    delete about_panel;
  if (help_dialog)
    delete help_dialog;

  if (g_shell_config)
    g_shell_config->write(preferences, FLD_TOOL_STORE_USER);
  layout_list->write(preferences, FLD_TOOL_STORE_USER);

  proj.undo.clear();

  proj.reset();
  ExternalCodeEditor::tmpdir_clear();
  delete_tmpdir();

  exit(0);
}


/**
 Return the working directory path at application launch.
 */
const char *Application::launch_path() const {
  return launch_path_;
}


/**
 Generate a path to a directory for temporary data storage.
 */
void Application::create_tmpdir() {
  if (tmpdir_create_called)
    return;
  tmpdir_create_called = 1;

  char buf[128];
  char path[FL_PATH_MAX];

#ifdef _WIN32
  fl_snprintf(buf, sizeof(buf) - 1, "fluid-%ld/", (long)GetCurrentProcessId());
  wchar_t tempdirW[FL_PATH_MAX + 1];
  char tempdir[FL_PATH_MAX + 1];
  unsigned len = GetTempPathW(FL_PATH_MAX, tempdirW);
  if (len == 0) {
    strcpy(tempdir, "c:/windows/temp/");
  } else {
    unsigned wn = fl_utf8fromwc(tempdir, FL_PATH_MAX, tempdirW, len);
    tempdir[wn] = 0;
  }
  fld_end_with_slash(path, FL_PATH_MAX, tempdir);
  strlcat(path, buf, FL_PATH_MAX);
  fl_make_path(path);
  if (fl_access(path, 6) == 0) strlcpy(tmpdir_path_, path, FL_PATH_MAX);
#else
  fl_snprintf(buf, sizeof(buf) - 1, "fluid-%d/", getpid());
  const char *path_temp = fl_getenv("TMPDIR");
  if (path_temp && *path_temp) {
    fld_end_with_slash(path, FL_PATH_MAX, path_temp);
    strlcat(path, buf, FL_PATH_MAX);
    fl_make_path(path);
    if (fl_access(path, 6) == 0) strlcpy(tmpdir_path_, path, FL_PATH_MAX);
  }
  if (tmpdir_path_[0] == '\0') {
    snprintf(path, FL_PATH_MAX, "/tmp/%s", buf);
    fl_make_path(path);
    if (fl_access(path, 6) == 0) strlcpy(tmpdir_path_, path, FL_PATH_MAX);
  }
#endif
  if (tmpdir_path_[0] == '\0') {
    char pbuf[FL_PATH_MAX + 1];
    preferences.get_userdata_path(pbuf, FL_PATH_MAX);
    fld_end_with_slash(path, FL_PATH_MAX, pbuf);
    strlcat(path, buf, FL_PATH_MAX);
    fl_make_path(path);
    if (fl_access(path, 6) == 0) strlcpy(tmpdir_path_, path, FL_PATH_MAX);
  }
  if (tmpdir_path_[0] == '\0') {
    if (batch_mode) {
      fprintf(stderr, "ERROR: Can't create directory for temporary data storage.\n");
    } else {
      fl_alert("Can't create directory for temporary data storage.");
    }
  }
}


/**
 Delete the temporary directory and all its contents.
 */
void Application::delete_tmpdir() {
  if (!tmpdir_create_called)
    return;
  if (tmpdir_path_[0] == '\0')
    return;

  struct dirent **de;
  int n_de = fl_filename_list(tmpdir_path_, &de);
  if (n_de >= 0) {
    int i;
    for (i = 0; i < n_de; i++) {
      char filepath[FL_PATH_MAX];
      snprintf(filepath, FL_PATH_MAX, "%s%s", tmpdir_path_, de[i]->d_name);
      fl_unlink(filepath);
    }
    fl_filename_free_list(&de, n_de);
  }

  if (fl_rmdir(tmpdir_path_) < 0) {
    if (batch_mode) {
      fprintf(stderr, "WARNING: Can't delete tmpdir '%s': %s", tmpdir_path_, strerror(errno));
    } else {
      fl_alert("WARNING: Can't delete tmpdir '%s': %s", tmpdir_path_, strerror(errno));
    }
  }
}


/**
 Return the path to a temporary directory for this instance of Fluid.
 */
const char *Application::get_tmpdir() {
  if (!tmpdir_create_called)
    create_tmpdir();
  return tmpdir_path_;
}


/**
 Return the path and filename of a temporary file for cut or duplicated data.
 */
const char *Application::cutfname(int which) {
  static char name[2][FL_PATH_MAX];
  static char beenhere = 0;

  if (!beenhere) {
    beenhere = 1;
    preferences.getUserdataPath(name[0], sizeof(name[0]));
    strlcat(name[0], "cut_buffer", sizeof(name[0]));
    preferences.getUserdataPath(name[1], sizeof(name[1]));
    strlcat(name[1], "dup_buffer", sizeof(name[1]));
  }

  return name[which];
}


/**
 Clear the current project and create a new, empty one.
 */
int Application::new_project(int user_must_confirm) {
  if ((user_must_confirm) && (confirm_project_clear() == 0))
    return 0;

  proj.reset();
  proj.clear_filename();
  proj.set_modflag(0, 0);
  widget_browser->rebuild();
  proj.update_settings_dialog();

  return 1;
}


/**
 Open a file chooser and load an existing project file.
 */
int Application::open_project_file(const char *filename_arg) {
  if (confirm_project_clear() == 0)
    return 0;

  char new_filename[FL_PATH_MAX];
  new_filename[0] = '\0';

  if (!filename_arg || !*filename_arg) {
    open_project_filechooser(new_filename, FL_PATH_MAX, "Open Project File");
    if (new_filename[0] == '\0') {
      return 0;
    }
  } else {
    strlcpy(new_filename, filename_arg, FL_PATH_MAX);
  }

  new_project(0);
  int success = merge_project_file(new_filename);
  if (success) mergeback_on_load();
  return success;
}


/**
 Load a project from the given file name and path.
 */
int Application::merge_project_file(const char *filename_arg) {
  int is_a_merge = (!proj.tree.empty());
  const char *title = is_a_merge ? "Merge Project File" : "Open Project File";

  char new_filename[FL_PATH_MAX];
  new_filename[0] = '\0';

  if (!filename_arg || !*filename_arg) {
    open_project_filechooser(new_filename, FL_PATH_MAX, title);
    if (new_filename[0] == '\0') {
      return 0;
    }
  } else {
    strlcpy(new_filename, filename_arg, FL_PATH_MAX);
  }

  const char *c = new_filename;
  const char *oldfilename = proj.proj_filename;
  proj.proj_filename = 0;
  proj.set_filename(c);
  if (is_a_merge) proj.undo.checkpoint();
  proj.undo.suspend();
  if (!read_file(proj, c, is_a_merge)) {
    proj.undo.resume();
    widget_browser->rebuild();
    proj.update_settings_dialog();
    fl_message("Can't read %s: %s", c, strerror(errno));
    free((void *)proj.proj_filename);
    proj.proj_filename = oldfilename;
    if (main_window) proj.set_modflag(proj.modflag);
    return 0;
  }
  proj.undo.resume();
  widget_browser->rebuild();
  if (is_a_merge) {
    proj.set_filename(oldfilename);
    proj.set_modflag(1);
  } else {
    proj.set_modflag(0, 0);
    proj.undo.clear();
  }
  if (oldfilename) free((void *)oldfilename);
  return 1;
}


/**
 Save the current design to the file given by filename.
 */
void Application::save_project_file(void *v) {
  flush_text_widgets();
  Fl_Native_File_Chooser fnfc;
  const char *c = proj.proj_filename;
  if (v || !c || !*c) {
    fnfc.title("Save Project File As:");
    fnfc.type(Fl_Native_File_Chooser::BROWSE_SAVE_FILE);
#ifndef __APPLE__
    fnfc.options(Fl_Native_File_Chooser::NEW_FOLDER);
#else
    fnfc.options(Fl_Native_File_Chooser::NEW_FOLDER | Fl_Native_File_Chooser::SAVEAS_CONFIRM);
#endif
    fnfc.filter("FLUID Files\t*.f[ld]");
    if (proj.proj_filename) {
      char proj_path[FL_PATH_MAX];
      proj.projectfile_path(proj_path, FL_PATH_MAX);
      if (proj_path[0]) fnfc.directory(proj_path);
      const char *proj_name = proj.projectfile_name();
      if (proj_name) fnfc.preset_file(proj_name);
    }
    fnfc.filter("Fluid Project\t*.fl\nAny\t*");
    if (fnfc.show() != 0) return;
    c = fnfc.filename();
#ifndef __APPLE__
    if (!fl_access(c, 0)) {
      const char *basename = fl_filename_name(c);
      if (fl_choice("The file \"%s\" already exists.\n"
                    "Do you want to replace it?", "Cancel",
                    "Replace", 0, basename) == 0) return;
    }
#endif
    if (v != (void *)2) proj.set_filename(c);
  }
  if (!write_file(proj, c)) {
    fl_alert("Error writing %s: %s", c, strerror(errno));
    return;
  }

  if (v != (void *)2) {
    proj.set_modflag(0, 1);
    proj.undo.save_ = proj.undo.current_;
  }
}


/**
 Reload the file set by filename, replacing the current design.
 */
void Application::revert_project() {
  if (proj.modflag) {
    if (!fl_choice("This user interface has been changed. Really revert?",
                   "Cancel", "Revert", 0)) return;
  }
  proj.undo.suspend();
  if (!read_file(proj, proj.proj_filename, 0)) {
    proj.undo.resume();
    widget_browser->rebuild();
    proj.update_settings_dialog();
    fl_message("Can't read %s: %s", proj.proj_filename, strerror(errno));
    return;
  }
  widget_browser->rebuild();
  proj.undo.resume();
  proj.set_modflag(0, 0);
  proj.undo.clear();
  proj.update_settings_dialog();
}


/**
 Open the template browser and load a new file from templates.
 */
int Application::new_project_from_template() {
  if (new_project(1) == 0)
    return 0;

  if (!template_panel) make_template_panel();

  template_clear();
  template_browser->add("Blank");
  template_load();

  template_name->hide();
  template_name->value("");

  template_instance->show();
  template_instance->deactivate();
  template_instance->value("");

  template_delete->show();

  template_submit->label("New");
  template_submit->deactivate();

  template_panel->label("New");

  template_browser->value(1);
  template_browser->do_callback();

  template_panel->show();
  while (template_panel->shown()) Fl::wait();

  int item = template_browser->value();
  if (item < 1) return 0;

  const char *tname = (const char *)template_browser->data(item);

  if (tname) {
    const char *iname = template_instance->value();

    if (iname && *iname) {
      char line[1024], *ptr, *next;
      FILE *infile, *outfile;

      if ((infile = fl_fopen(tname, "rb")) == 0) {
        fl_alert("Error reading template file \"%s\":\n%s", tname,
                 strerror(errno));
        proj.set_modflag(0);
        proj.undo.clear();
        return 0;
      }

      if ((outfile = fl_fopen(cutfname(1), "wb")) == 0) {
        fl_alert("Error writing buffer file \"%s\":\n%s", cutfname(1),
                 strerror(errno));
        fclose(infile);
        proj.set_modflag(0);
        proj.undo.clear();
        return 0;
      }

      while (fgets(line, sizeof(line), infile)) {
        for (ptr = line; (next = strstr(ptr, "@INSTANCE@")) != 0; ptr = next + 10) {
          fwrite(ptr, next - ptr, 1, outfile);
          fputs(iname, outfile);
        }
        fputs(ptr, outfile);
      }

      fclose(infile);
      fclose(outfile);

      proj.undo.suspend();
      read_file(proj, cutfname(1), 0);
      fl_unlink(cutfname(1));
      proj.undo.resume();
    } else {
      proj.undo.suspend();
      read_file(proj, tname, 0);
      proj.undo.resume();
    }
  }

  widget_browser->rebuild();
  proj.update_settings_dialog();
  proj.set_modflag(0);
  proj.undo.clear();

  return 1;
}


/**
 Open the dialog to allow the user to print the current window.
 */
void Application::print_snapshots() {
  int w, h, ww, hh;
  int frompage, topage;
  int num_windows = 0;
  Window_Node *windows[1000];
  int winpage;
  Fl_Window *win;

  for (Node *wn: proj.tree.all_nodes()) {
    if (wn->is_a(FLD_NODE_TYPE_Window)) {
      Window_Node *win_t = static_cast<Window_Node*>(wn);
      Fl_Window *win_w = static_cast<Fl_Window*>(win_t->o);
      if (!win_w->shown()) continue;
      windows[num_windows] = win_t;
      num_windows++;
    }
  }

  Fl_Printer printjob;
  if (printjob.start_job(num_windows, &frompage, &topage)) return;
  int pagecount = 0;
  for (winpage = 0; winpage < num_windows; winpage++) {
    float scale = 1, scale_x = 1, scale_y = 1;
    if (winpage + 1 < frompage || winpage + 1 > topage) continue;
    printjob.start_page();
    printjob.printable_rect(&w, &h);

    time_t curtime = time(0);
    struct tm *curdate = localtime(&curtime);
    char date[1024];
    strftime(date, sizeof(date), "%c", curdate);
    fl_font(FL_HELVETICA, 12);
    fl_color(FL_BLACK);
    fl_draw(date, (w - (int)fl_width(date)) / 2, fl_height());
    sprintf(date, "%d/%d", ++pagecount, topage - frompage + 1);
    fl_draw(date, w - (int)fl_width(date), fl_height());

    const char *basename = fl_filename_name(proj.proj_filename);
    if (basename) fl_draw(basename, 0, fl_height());

    win = (Fl_Window*)windows[winpage]->o;
    ww = win->decorated_w();
    if (ww > w) scale_x = float(w) / ww;
    hh = win->decorated_h();
    if (hh > h) scale_y = float(h) / hh;
    if (scale_x < scale) scale = scale_x;
    if (scale_y < scale) scale = scale_y;
    if (scale < 1) {
      printjob.scale(scale);
      printjob.printable_rect(&w, &h);
    }
    printjob.origin(w / 2, h / 2);
    printjob.print_window(win, -ww / 2, -hh / 2);
    printjob.end_page();
  }
  printjob.end_job();
}


/**
 Generate the C++ source and header filenames and write those files.
 */
int Application::write_code_files(int dont_show_completion_dialog) {
  flush_text_widgets();
  if (!proj.proj_filename) {
    save_project_file(0);
    if (!proj.proj_filename) return 1;
  }

  Code_Writer f(proj);

  char code_path[FL_PATH_MAX], code_name[FL_PATH_MAX];
  char header_path[FL_PATH_MAX], header_name[FL_PATH_MAX];
  proj.codefile_path(code_path, FL_PATH_MAX);
  proj.codefile_name(code_name, FL_PATH_MAX);
  proj.headerfile_path(header_path, FL_PATH_MAX);
  proj.headerfile_name(header_name, FL_PATH_MAX);

  char code_filename[FL_PATH_MAX], header_filename[FL_PATH_MAX];
  snprintf(code_filename, FL_PATH_MAX, "%s%s", code_path, code_name);
  snprintf(header_filename, FL_PATH_MAX, "%s%s", header_path, header_name);

  if (!batch_mode) proj.enter_project_dir();
  int x = f.write_code(code_filename, header_filename);

  char code_filename_rel[FL_PATH_MAX], header_filename_rel[FL_PATH_MAX];
  fl_filename_relative(code_filename_rel, FL_PATH_MAX, code_filename);
  fl_filename_relative(header_filename_rel, FL_PATH_MAX, header_filename);
  if (!batch_mode) proj.leave_project_dir();

  if (batch_mode) {
    if (!x) {
      fprintf(stderr, "%s and %s: %s\n",
              code_filename_rel, header_filename_rel, strerror(errno));
      exit(1);
    }
  } else {
    if (!x) {
      fl_message("Can't write %s or %s: %s",
                 code_filename_rel, header_filename_rel, strerror(errno));
    } else {
      proj.set_modflag(-1, 0);
      if (dont_show_completion_dialog == 0 && completion_button->value()) {
        fl_message("Wrote %s and %s", code_filename_rel, header_filename_rel);
      }
    }
  }
  return 0;
}


void Application::cut_selected() {
  if (!proj.tree.current) {
    fl_beep();
    return;
  }
  flush_text_widgets();
  if (!write_file(proj, cutfname(), 1)) {
    fl_message("Can't write %s: %s", cutfname(), strerror(errno));
    return;
  }
  proj.undo.checkpoint();
  proj.set_modflag(1);
  ipasteoffset = 0;
  Node *p = proj.tree.current->parent;
  while (p && p->selected) p = p->parent;
  delete_all(1);
  if (p) select_only(p);
  widget_browser->rebuild();
}


void Application::copy_selected() {
  flush_text_widgets();
  if (!proj.tree.current) {
    fl_beep();
    return;
  }
  flush_text_widgets();
  ipasteoffset = 10;
  if (!write_file(proj, cutfname(), 1)) {
    fl_message("Can't write %s: %s", cutfname(), strerror(errno));
    return;
  }
}


void Application::paste_from_clipboard() {
  pasteoffset = ipasteoffset;
  proj.undo.checkpoint();
  proj.undo.suspend();
  Strategy strategy = Strategy::FROM_FILE_AFTER_CURRENT;
  if (proj.tree.current && proj.tree.current->can_have_children()) {
    if (proj.tree.current->folded_ == 0) {
      strategy = Strategy::FROM_FILE_AS_LAST_CHILD;
    }
  }
  if (!read_file(proj, cutfname(), 1, strategy)) {
    widget_browser->rebuild();
    fl_message("Can't read %s: %s", cutfname(), strerror(errno));
  }
  proj.undo.resume();
  widget_browser->display(proj.tree.current);
  widget_browser->rebuild();
  pasteoffset = 0;
  ipasteoffset += 10;
}


void Application::duplicate_selected() {
  if (!proj.tree.current) {
    fl_beep();
    return;
  }

  flush_text_widgets();

  int lowest_level = 9999;
  Node *new_insert = 0;
  if (proj.tree.current->selected) {
    for (Node *t: proj.tree.all_nodes()) {
      if (t->selected && t->level <= lowest_level) {
        lowest_level = t->level;
        new_insert = t;
      }
    }
  }
  if (new_insert)
    proj.tree.current = new_insert;

  if (!write_file(proj, cutfname(1), 1)) {
    fl_message("Can't write %s: %s", cutfname(1), strerror(errno));
    return;
  }

  pasteoffset = 0;
  proj.undo.checkpoint();
  proj.undo.suspend();
  if (!read_file(proj, cutfname(1), 1, Strategy::FROM_FILE_AFTER_CURRENT)) {
    fl_message("Can't read %s: %s", cutfname(1), strerror(errno));
  }
  fl_unlink(cutfname(1));
  widget_browser->display(proj.tree.current);
  widget_browser->rebuild();
  proj.undo.resume();
}


void Application::delete_selected() {
  if (!proj.tree.current) {
    fl_beep();
    return;
  }
  proj.undo.checkpoint();
  proj.set_modflag(1);
  ipasteoffset = 0;
  Node *p = proj.tree.current->parent;
  while (p && p->selected) p = p->parent;
  delete_all(1);
  if (p) select_only(p);
  widget_browser->rebuild();
}


void Application::edit_selected() {
  if (!proj.tree.current) {
    fl_message("Please select a widget");
    return;
  }
  proj.tree.current->open();
}


void Application::sort_selected() {
  proj.undo.checkpoint();
  sort((Node*)0);
  widget_browser->rebuild();
  proj.set_modflag(1);
}


void Application::toggle_widget_bin() {
  if (!widgetbin_panel) {
    make_widgetbin();
    if (!position_window(widgetbin_panel, "widgetbin_pos", 1, 320, 30)) return;
  }

  if (widgetbin_panel->visible()) {
    widgetbin_panel->hide();
    widgetbin_item->label("Show Widget &Bin...");
  } else {
    widgetbin_panel->show();
    widgetbin_item->label("Hide Widget &Bin");
  }
}


void Application::show_help(const char *name) {
  const char *docdir;
  char helpname[FL_PATH_MAX];

  if (!help_dialog) help_dialog = new Fl_Help_Dialog();

  if ((docdir = fl_getenv("FLTK_DOCDIR")) == 0) {
    docdir = FLTK_DOCDIR;
  }
  snprintf(helpname, sizeof(helpname), "%s/%s", docdir, name);

  FILE *f = fopen(helpname, "rb");
  if (f) {
    fclose(f);
    help_dialog->load(helpname);
  } else {
    if (strcmp(name, "fluid.html") == 0) {
      if (!Fl_Shared_Image::find("embedded:/fluid_flow_chart_800.png"))
        new Fl_PNG_Image("embedded:/fluid_flow_chart_800.png", fluid_flow_chart_800_png, sizeof(fluid_flow_chart_800_png));
      help_dialog->value(
       "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\n"
       "<html><head><title>FLTK: Programming with FLUID</title></head><body>\n"
       "<h2>What is FLUID?</h2>\n"
       "The Fast Light User Interface Designer, or FLUID, is a graphical editor "
       "that is used to produce FLTK source code. FLUID edits and saves its state "
       "in <code>.fl</code> files. These files are text, and you can (with care) "
       "edit them in a text editor, perhaps to get some special effects.<p>\n"
       "FLUID can \"compile\" the <code>.fl</code> file into a <code>.cxx</code> "
       "and a <code>.h</code> file. The <code>.cxx</code> file defines all the "
       "objects from the <code>.fl</code> file and the <code>.h</code> file "
       "declares all the global ones. FLUID also supports localization "
       "(Internationalization) of label strings using message files and the GNU "
       "gettext or POSIX catgets interfaces.<p>\n"
       "A simple program can be made by putting all your code (including a <code>"
       "main()</code> function) into the <code>.fl</code> file and thus making the "
       "<code>.cxx</code> file a single source file to compile. Most programs are "
       "more complex than this, so you write other <code>.cxx</code> files that "
       "call the FLUID functions. These <code>.cxx</code> files must <code>"
       "#include</code> the <code>.h</code> file or they can <code>#include</code> "
       "the <code>.cxx</code> file so it still appears to be a single source file.<p>"
       "<img src=\"embedded:/fluid_flow_chart_800.png\"></p>"
       "<p>More information is available online at <a href="
       "\"https://www.fltk.org/doc-1.5/fluid.html\">https://www.fltk.org/</a>"
       "</body></html>"
      );
    } else if (strcmp(name, "license.html") == 0) {
      fl_open_uri("https://www.fltk.org/doc-1.5/license.html");
      return;
    } else if (strcmp(name, "index.html") == 0) {
      fl_open_uri("https://www.fltk.org/doc-1.5/index.html");
      return;
    } else {
      snprintf(helpname, sizeof(helpname), "https://www.fltk.org/%s", name);
      fl_open_uri(helpname);
      return;
    }
  }
  help_dialog->show();
}


void Application::about() {
  if (!about_panel) make_about_panel();
  about_panel->show();
}


void Application::make_main_window() {
  if (!batch_mode) {
    preferences.get("show_guides", show_guides, 1);
    preferences.get("show_restricted", show_restricted, 1);
    preferences.get("show_ghosted_outline", show_ghosted_outline, 0);
    preferences.get("show_comments", show_comments, 1);
    make_shell_window();
  }

  if (!main_window) {
    Fl_Widget *o;
    loadPixmaps();
    main_window = new Fl_Double_Window(FLD_WINWIDTH, FLD_WINHEIGHT, "fluid");
    main_window->box(FL_NO_BOX);
    o = make_widget_browser(0, FLD_MENUHEIGHT, FLD_BROWSERWIDTH, FLD_BROWSERHEIGHT);
    o->box(FL_FLAT_BOX);
    o->tooltip("Double-click to view or change an item.");
    main_window->resizable(o);
    main_menubar = new App_Menu_Bar(0, 0, FLD_BROWSERWIDTH, FLD_MENUHEIGHT);
    main_menubar->menu(main_menu);
    save_item = (Fl_Menu_Item*)main_menubar->find_item(menu_file_save_cb);
    history_item = (Fl_Menu_Item*)main_menubar->find_item(menu_file_open_history_cb);
    widgetbin_item = (Fl_Menu_Item*)main_menubar->find_item(toggle_widgetbin_cb);
    codeview_item = (Fl_Menu_Item*)main_menubar->find_item((Fl_Callback*)toggle_codeview_cb);
    overlay_item = (Fl_Menu_Item*)main_menubar->find_item((Fl_Callback*)toggle_overlays);
    guides_item = (Fl_Menu_Item*)main_menubar->find_item((Fl_Callback*)toggle_guides);
    restricted_item = (Fl_Menu_Item*)main_menubar->find_item((Fl_Callback*)toggle_restricted);
    main_menubar->global();
    fill_in_New_Menu();
    main_window->end();
  }

  if (!batch_mode) {
    history.load();
    g_shell_config = new Fd_Shell_Command_List;
    layout_list = new Layout_List;
    widget_browser->load_prefs();
    make_settings_window();
  }
}


void Application::open_project_filechooser(char *result, int result_size, const char *title) {
  result[0] = '\0';
  Fl_Native_File_Chooser dialog;
  dialog.title(title);
  dialog.type(Fl_Native_File_Chooser::BROWSE_FILE);
  dialog.filter("FLUID Files\t*.f[ld]\n");
  if (proj.proj_filename) {
    char path[FL_PATH_MAX];
    fl_filename_path(path, FL_PATH_MAX, proj.proj_filename);
    dialog.directory(path);
    dialog.preset_file(fl_filename_name(proj.proj_filename));
  }
  if (dialog.show() != 0)
    return;
  strlcpy(result, dialog.filename(), result_size);
}


int Application::confirm_project_clear() {
  if (proj.modflag == 0) return 1;
  switch (fl_choice("This project has unsaved changes. Do you want to save\n"
                    "the project file before proceeding?",
                    "Cancel", "Save", "Don't Save"))
  {
    case 0:
      return 0;
    case 1:
      save_project_file(0);
      if (proj.modflag) return 0;
  }
  return 1;
}


void Application::flush_text_widgets() {
  if (Fl::focus() && (Fl::focus()->top_window() == the_panel)) {
    Fl_Widget *old_focus = Fl::focus();
    Fl::focus(0);
    Fl::focus(old_focus);
  }
}


char Application::position_window(Fl_Window *w, const char *prefsName, int Visible, int X, int Y, int W, int H) {
  Fl_Preferences pos(preferences, prefsName);
  if (prevpos_button->value()) {
    pos.get("x", X, X);
    pos.get("y", Y, Y);
    if (W != 0) {
      pos.get("w", W, W);
      pos.get("h", H, H);
      w->resize(X, Y, W, H);
    } else {
      w->position(X, Y);
    }
  }
  pos.get("visible", Visible, Visible);
  return Visible;
}


void Application::save_position(Fl_Window *w, const char *prefsName) {
  Fl_Preferences pos(preferences, prefsName);
  pos.set("x", w->x());
  pos.set("y", w->y());
  pos.set("w", w->w());
  pos.set("h", w->h());
  pos.set("visible", (int)(w->shown() && w->visible()));
}


void Application::set_scheme(const char *new_scheme) {
  if (batch_mode)
    return;

  if (Fl::is_scheme(new_scheme))
    return;

  Fl::scheme(new_scheme);
  preferences.set("scheme_name", new_scheme);

  int scheme_index = scheme_choice->value();
  if (scheme_index <= 3)
    preferences.set("scheme", scheme_index + 1);
}


void Application::init_scheme() {
  int scheme_index = 0;
  char *scheme_name = 0;
  preferences.get("scheme_name", scheme_name, "XXX");
  if (!strcmp(scheme_name, "XXX")) {
    preferences.get("scheme", scheme_index, 0);
    if (scheme_index > 0) {
      scheme_index--;
      scheme_choice->value(scheme_index);
    }
    if (scheme_index < 0)
      scheme_index = 0;
    else if (scheme_index > scheme_choice->size() - 1)
      scheme_index = 0;
    scheme_name = const_cast<char *>(scheme_choice->text(scheme_index));
    preferences.set("scheme_name", scheme_name);
  }
  if (Fl::scheme() == 0) {
    Fl::scheme(scheme_name);
  }
  free(scheme_name);
}


#ifdef __APPLE__
void Application::apple_open_cb(const char *c) {
  Fluid.open_project_file(c);
}
#endif