fltk/examples/menubar-add.cxx

//
//      An example of using Fl_Menu_Bar's add() to dynamically create menubars
//
//      Menu bars can be created several ways. Using add() allows
//      dynamically creating a menubar using a 'pathname' syntax.
//      Use if you're creating items dynamically, or if you're making
//      menubars by hand (as opposed to using fluid), as it's easier
//      to type and read.
//
//      In this case we're using one callback for all items,
//      but you can make unique callbacks for each item if needed.
//
// Copyright 2010 Greg Ercolano.
// Copyright 1998-2010 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 <stdio.h>                      // fprintf()
#include <stdlib.h>                     // exit()
#include <string.h>                     // strcmp()
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Menu_Bar.H>
#include <FL/filename.H>                // fl_open_uri()

// This callback is invoked whenever the user clicks an item in the menu bar
static void MyMenuCallback(Fl_Widget *w, void *) {
  Fl_Menu_Bar *bar = (Fl_Menu_Bar*)w;                           // Get the menubar widget
  const Fl_Menu_Item *item = bar->mvalue();                     // Get the menu item that was picked

  char ipath[256]; bar->item_pathname(ipath, sizeof(ipath));    // Get full pathname of picked item

  fprintf(stderr, "callback: You picked '%s'", item->label());  // Print item picked
  fprintf(stderr, ", item_pathname() is '%s'", ipath);          // ..and full pathname

  if ( item->flags & (FL_MENU_RADIO|FL_MENU_TOGGLE) ) {         // Toggle or radio item?
    fprintf(stderr, ", value is %s", item->value()?"on":"off"); // Print item's value
  }
  fprintf(stderr, "\n");
  if ( strcmp(item->label(), "Google") == 0 ) { fl_open_uri("http://google.com/"); }
  if ( strcmp(item->label(), "&Quit") == 0 ) { exit(0); }
}

int main() {
  Fl::scheme("gtk+");
  Fl_Window *win = new Fl_Window(400,200, "menubar-simple");    // Create window
  Fl_Menu_Bar *menu = new Fl_Menu_Bar(0,0,400,25);              // Create menubar, items..
  menu->add("&File/&Open",  "^o", MyMenuCallback);
  menu->add("&File/&Save",  "^s", MyMenuCallback, 0, FL_MENU_DIVIDER);
  menu->add("&File/&Quit",  "^q", MyMenuCallback);
  menu->add("&Edit/&Copy",  "^c", MyMenuCallback);
  menu->add("&Edit/&Paste", "^v", MyMenuCallback, 0, FL_MENU_DIVIDER);
  menu->add("&Edit/Radio 1",   0, MyMenuCallback, 0, FL_MENU_RADIO);
  menu->add("&Edit/Radio 2",   0, MyMenuCallback, 0, FL_MENU_RADIO|FL_MENU_DIVIDER);
  menu->add("&Edit/Toggle 1",  0, MyMenuCallback, 0, FL_MENU_TOGGLE);                   // Default: off
  menu->add("&Edit/Toggle 2",  0, MyMenuCallback, 0, FL_MENU_TOGGLE);                   // Default: off
  menu->add("&Edit/Toggle 3",  0, MyMenuCallback, 0, FL_MENU_TOGGLE|FL_MENU_VALUE);     // Default: on
  menu->add("&Help/Google",    0, MyMenuCallback);

  // Example: show how we can dynamically change the state of item Toggle #2 (turn it 'on')
  {
      Fl_Menu_Item *item = (Fl_Menu_Item*)menu->find_item("&Edit/Toggle 2");    // Find item
      if ( item ) item->set();                                                  // Turn it on
      else fprintf(stderr, "'Toggle 2' item not found?!\n");                    // (optional) Not found? complain!
  }

  win->end();
  win->show();
  return(Fl::run());
}