162 lines
3.4 KiB
C++
162 lines
3.4 KiB
C++
/*
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Copyright (C) 2014 Tim Mayberry
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "pbd/timer.h"
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namespace PBD {
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Timer::Timer (unsigned int interval,
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const Glib::RefPtr<Glib::MainContext>& main_context)
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: m_timeout_source(NULL)
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, m_timeout_interval(interval)
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, m_main_context(main_context)
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, m_suspended(false)
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{
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}
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gboolean
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Timer::_timeout_handler (void *data)
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{
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Timer *const timer = static_cast<Timer*>(data);
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return timer->timeout_handler();
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}
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unsigned int
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Timer::get_interval () const
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{
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return m_timeout_interval;
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}
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void
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Timer::set_interval (unsigned int new_interval)
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{
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if (new_interval == m_timeout_interval) return;
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stop ();
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m_timeout_interval = new_interval;
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start ();
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}
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/**
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* We don't use Glibmm::TimeoutSource::create() here as contrary
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* to the documentation, SignalTimeout::connect and manually
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* adding a TimeoutSource to a GMainContext are not equivalent.
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*
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* SignalTimeout::connect is the equivalent of g_timeout_add in
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* terms off callback timing but TimeoutSource tries to adjust
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* the timeout based on the time elapsed since the last timeout.
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*
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* On Windows with a high frequency timeout(40ms) this causes a
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* small but noticable increase in CPU Usage.
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*/
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void
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Timer::start()
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{
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if (m_timeout_source) return;
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m_timeout_source = g_timeout_source_new (m_timeout_interval);
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#if 0 // support priorites?
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if(priority != G_PRIORITY_DEFAULT)
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g_source_set_priority(source, priority);
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#endif
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g_source_set_callback (m_timeout_source, &Timer::_timeout_handler, this, NULL);
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g_source_attach (m_timeout_source, m_main_context->gobj());
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// GMainContext also holds a reference
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}
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void
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Timer::stop()
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{
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if (m_timeout_source) {
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g_source_destroy (m_timeout_source);
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g_source_unref (m_timeout_source);
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m_timeout_source = NULL;
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}
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}
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bool
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Timer::timeout_handler()
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{
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return on_elapsed();
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}
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StandardTimer::StandardTimer(unsigned int interval,
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const Glib::RefPtr<Glib::MainContext>& main_context)
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: Timer(interval, main_context)
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{ }
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sigc::connection
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StandardTimer::connect(const sigc::slot<void>& slot)
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{
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if(m_signal.size() == 0) { start(); }
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return m_signal.connect(slot);
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}
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bool
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StandardTimer::on_elapsed()
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{
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if(m_signal.size() == 0)
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{
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stop();
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return false;
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}
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if (!suspended ()) {
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m_signal();
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}
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return true;
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}
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BlinkTimer::BlinkTimer(unsigned int interval,
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const Glib::RefPtr<Glib::MainContext>& main_context)
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: Timer(interval, main_context)
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{ }
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sigc::connection
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BlinkTimer::connect(const sigc::slot<void, bool>& slot)
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{
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if(m_blink_signal.size() == 0) { start(); }
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return m_blink_signal.connect(slot);
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}
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bool
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BlinkTimer::on_elapsed()
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{
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static bool blink_on = false;
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if(m_blink_signal.size() == 0)
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{
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stop();
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return false;
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}
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if (!suspended ()) {
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m_blink_signal(blink_on = !blink_on);
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}
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return true;
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}
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} // namespace PBD
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