pbd/pbd/timer.h

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/*
 * Copyright (C) 2014 Tim Mayberry <mojofunk@gmail.com>
 * Copyright (C) 2015 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <sigc++/signal.h>
 
#include <glibmm/main.h>
 
#include "pbd/libpbd_visibility.h"
 
namespace PBD {
 
class LIBPBD_API Timer
{
public:
 
        Timer (unsigned int interval,
               const Glib::RefPtr<Glib::MainContext>& main_context);
 
        unsigned int get_interval () const;
 
        void set_interval (unsigned int new_interval);
 
        virtual unsigned int connection_count () const = 0;
 
        void suspend () { m_suspended = true; }
        void resume  () { m_suspended = false; }
 
protected:
 
        virtual ~Timer() { }
 
        void start ();
 
        void stop ();
 
        virtual bool on_elapsed () = 0;
 
        bool suspended  () const { return m_suspended; }
 
private:
 
        Timer(const Timer&);
        Timer& operator= (const Timer&);
 
private:
 
        static gboolean _timeout_handler (void *data);
 
        bool timeout_handler ();
 
        GSource*                               m_timeout_source;
 
        unsigned int                           m_timeout_interval;
 
        const Glib::RefPtr<Glib::MainContext>  m_main_context;
 
        bool                                   m_suspended;
 
};
 
class LIBPBD_API StandardTimer : public Timer
{
public:
 
        StandardTimer (unsigned int interval,
                       const Glib::RefPtr<Glib::MainContext>& main_context = Glib::MainContext::get_default());
 
        sigc::connection connect (const sigc::slot<void>& slot);
 
        virtual unsigned int connection_count () const
        { return m_signal.size (); }
 
protected:
 
        virtual bool on_elapsed ();
 
        sigc::signal<void>                  m_signal;
 
};
 
class LIBPBD_API BlinkTimer : public Timer
{
public:
 
        BlinkTimer (unsigned int interval,
                    const Glib::RefPtr<Glib::MainContext>& main_context = Glib::MainContext::get_default());
 
 
        sigc::connection connect (const sigc::slot<void, bool>& slot);
 
        virtual unsigned int connection_count () const
        { return m_blink_signal.size (); }
 
protected:
 
        virtual bool on_elapsed ();
 
        sigc::signal<void, bool> m_blink_signal;
 
};
 
} // namespace PBD