libs/gtkmm2ext/idle_adjustment.cc

   1 /*
   2     Copyright (C) 2000-2007 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #define _BSD_SOURCE
  21 #include <gtkmm2ext/idle_adjustment.h>
  22 #include <gtkmm/main.h>
  23 #include <iostream>
  24
  25 using namespace Gtk;
  26 using namespace sigc;
  27 using namespace Gtkmm2ext;
  28
  29 IdleAdjustment::IdleAdjustment (Gtk::Adjustment& adj)
  30 {
  31         adj.signal_value_changed().connect (mem_fun (*this, &IdleAdjustment::underlying_adjustment_value_changed));
  32         timeout_queued = 0;
  33         gettimeofday (&last_vc, 0);
  34 }
  35
  36 IdleAdjustment::~IdleAdjustment ()
  37 {
  38 }
  39
  40 void
  41 IdleAdjustment::underlying_adjustment_value_changed ()
  42 {
  43         gettimeofday (&last_vc, 0);
  44
  45         if (timeout_queued) {
  46                 return;
  47         }
  48
  49         Glib::signal_timeout().connect(mem_fun(*this, &IdleAdjustment::timeout_handler), 250);
  50         timeout_queued = true;
  51 }
  52
  53 gint
  54 IdleAdjustment::timeout_handler ()
  55 {
  56         struct timeval now;
  57         struct timeval tdiff;
  58
  59         gettimeofday (&now, 0);
  60
  61         timersub (&now, &last_vc, &tdiff);
  62
  63         std::cerr << "timer elapsed, diff = " << tdiff.tv_sec << " + " << tdiff.tv_usec << std::endl;
  64
  65         if (tdiff.tv_sec > 0 || tdiff.tv_usec > 250000) {
  66                 std::cerr << "send signal\n";
  67                 value_changed ();
  68                 timeout_queued = false;
  69                 return FALSE;
  70         } else {
  71                 return TRUE;
  72         }
  73 }