Added Fl_Tree sort example.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10035 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

examples/Makefile

@@ -25,6 +25,7 @@ ALL = howto-add_fd-and-popen$(EXEEXT) \
       tree-simple$(EXEEXT) \
       tree-as-container$(EXEEXT) \
       tree-custom-draw-items$(EXEEXT) \
+      tree-custom-sort$(EXEEXT) \
       tree-of-tables$(EXEEXT) \
       wizard-simple$(EXEEXT)
 

examples/tree-custom-sort.cxx

@@ -0,0 +1,82 @@
+//
+// "$Id$"
+//
+//	Simple Fl_Tree custom (numeric) sort example. - erco 12/16/2013
+//      Demonstrates custom sorting of Fl_Tree items.
+//
+// Copyright 2013 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 <stdlib.h>	/* qsort(3), srand(3).. */
+#include <time.h>	/* time(2) */
+#include <FL/Fl.H>
+#include <FL/Fl_Double_Window.H>
+#include <FL/Fl_Tree.H>
+#include <FL/Fl_Button.H>
+
+Fl_Tree *G_tree = 0;
+
+// Resort the tree
+void MySortCallback(Fl_Widget*, void *data) {
+  int dir = int(long(data));		// forward or reverse
+  Fl_Tree_Item *i = G_tree->root();
+  // Bubble sort
+  for ( int ax=0; ax<i->children(); ax++ ) {
+    for ( int bx=ax+1; bx<i->children(); bx++ ) {
+      long a; sscanf(i->child(ax)->label(), "%ld", &a);
+      long b; sscanf(i->child(bx)->label(), "%ld", &b);
+      switch ( dir ) {
+        case  1: if ( a > b ) { i->swap_children(ax, bx); } break; // fwd
+        case -1: if ( a < b ) { i->swap_children(ax, bx); } break; // rev
+      }
+    }
+  }
+  G_tree->redraw();
+}
+
+int main(int argc, char *argv[]) {
+  // Randomize the random number generator
+  time_t tval; time(&tval);
+  srand((unsigned)tval);
+
+  // Create window with tree
+  Fl::scheme("gtk+");
+  Fl_Double_Window *win = new Fl_Double_Window(250, 600, "Numeric Sort Tree");
+  win->begin();
+  {
+    G_tree = new Fl_Tree(10, 10, win->w()-20, win->h()-60);
+    G_tree->showroot(0);
+
+    // Add 200 random numbers to the tree
+    Fl_Tree_Item *item;
+    char word[50];
+    for ( int t=0; t<200; t++ ) {
+      sprintf(word, "%ld", long((float(rand()) / RAND_MAX) * 1000000));
+      item = G_tree->add(word);
+    }
+
+    // Add some sort buttons
+    Fl_Button *but;
+    but = new Fl_Button(10,   win->h()-40,80,20,"Fwd"); but->callback(MySortCallback, (void*) 1);
+    but = new Fl_Button(20+80,win->h()-40,80,20,"Rev"); but->callback(MySortCallback, (void*)-1);
+  }
+  win->end();
+  win->resizable(win);
+  win->show(argc, argv);
+  return(Fl::run());
+}
+
+//
+// End of "$Id$".
+//