idle_adjustment.cc

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/*
    Copyright (C) 2000-2007 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#define _BSD_SOURCE
#include <gtkmm2ext/idle_adjustment.h>
#include <gtkmm/main.h>
#include <glibmm/main.h>
#include <iostream>

#include "pbd/timersub.h"

using namespace Gtk;
using namespace sigc;
using namespace Gtkmm2ext;

IdleAdjustment::IdleAdjustment (Gtk::Adjustment& adj)
{
        adj.signal_value_changed().connect (mem_fun (*this, &IdleAdjustment::underlying_adjustment_value_changed));
        timeout_queued = 0;
        last_vc = g_get_monotonic_time();
}

IdleAdjustment::~IdleAdjustment ()
{
}

void
IdleAdjustment::underlying_adjustment_value_changed ()
{
        last_vc = g_get_monotonic_time();
        
        if (timeout_queued) {
                return;
        }

        Glib::signal_timeout().connect(mem_fun(*this, &IdleAdjustment::timeout_handler), 250);
        timeout_queued = true;
}       

gint
IdleAdjustment::timeout_handler ()
{
        int64_t now, tdiff;
        now = g_get_monotonic_time();
        tdiff = now - last_vc;

        std::cerr << "timer elapsed, diff = " << tdiff << " usec" << std::endl;

        if (tdiff > 250000) {
                std::cerr << "send signal\n";
                value_changed ();
                timeout_queued = false;
                return FALSE;
        } else {
                return TRUE;
        }
}