fltk/examples/tree-simple.cxx

//
//      Simple Fl_Tree widget example. - erco 06/05/2010
//
// Copyright 2010 Greg Ercolano.
// Copyright 1998-2016 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>
#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());
      break;
    // To enable this callback, use tree->item_reselect_mode(FL_TREE_SELECTABLE_ALWAYS);
    case FL_TREE_REASON_RESELECTED:
      // fprintf(stderr, "TreeCallback: Item '%s' reselected\n", item->label());
      break;
    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());
}