text: //
  // "$Id: tree-simple.cxx 8864 2011-07-19 04:49:30Z greg.ercolano $"
  //
  //	Simple Fl_Tree widget example. - erco 06/05/2010
  //
  // 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:
  //
  //     http://www.fltk.org/COPYING.php
  //
  // Please report all bugs and problems on the following page:
  //
  //     http://www.fltk.org/str.php
  //
  #include <stdio.h>
  #include <FL/Fl.H>
  #include <FL/Fl_Double_Window.H>
  #include <FL/Fl_Tree.H>
  
  // Tree's callback
  //    Invoked whenever an item's state changes.
  //
  void TreeCallback(Fl_Widget *w, void *data) {
    Fl_Tree *tree = (Fl_Tree*)w;
    Fl_Tree_Item *item = (Fl_Tree_Item*)tree->callback_item();
    if ( ! item ) return;
    switch ( tree->callback_reason() ) {
      case FL_TREE_REASON_SELECTED: {
        char pathname[256];
        tree->item_pathname(pathname, sizeof(pathname), item);
        fprintf(stderr, "TreeCallback: Item selected='%s', Full pathname='%s'\n", item->label(), pathname);
        break;
      }
      case FL_TREE_REASON_DESELECTED:
        // fprintf(stderr, "TreeCallback: Item '%s' deselected\n", item->label());
        break;
      case FL_TREE_REASON_OPENED:
        // fprintf(stderr, "TreeCallback: Item '%s' opened\n", item->label());
        break;
      case FL_TREE_REASON_CLOSED:
        // fprintf(stderr, "TreeCallback: Item '%s' closed\n", item->label());
      default:
        break;
    }
  }
  
  int main(int argc, char *argv[]) {
    Fl::scheme("gtk+");
    Fl_Double_Window *win = new Fl_Double_Window(250, 400, "Simple Tree");
    win->begin();
    {
      // Create the tree
      Fl_Tree *tree = new Fl_Tree(10, 10, win->w()-20, win->h()-20);
      tree->showroot(0);				// don't show root of tree
      tree->callback(TreeCallback);		// setup a callback for the tree
  
      // Add some items
      tree->add("Flintstones/Fred");
      tree->add("Flintstones/Wilma");
      tree->add("Flintstones/Pebbles");
      tree->add("Simpsons/Homer");
      tree->add("Simpsons/Marge");
      tree->add("Simpsons/Bart");
      tree->add("Simpsons/Lisa");
      tree->add("Pathnames/\\/bin");		// front slashes
      tree->add("Pathnames/\\/usr\\/sbin");
      tree->add("Pathnames/C:\\\\Program Files");	// backslashes
      tree->add("Pathnames/C:\\\\Documents and Settings");
  
      // Start with some items closed
      tree->close("Simpsons");
      tree->close("Pathnames");
    }
    win->end();
    win->resizable(win);
    win->show(argc, argv);
    return(Fl::run());
  }
  
  //
  // End of "$Id: tree-simple.cxx 8864 2011-07-19 04:49:30Z greg.ercolano $".
  //
  