aboutsummaryrefslogtreecommitdiff
path: root/src/clock-live.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/clock-live.cpp')
-rw-r--r--src/clock-live.cpp163
1 files changed, 163 insertions, 0 deletions
diff --git a/src/clock-live.cpp b/src/clock-live.cpp
new file mode 100644
index 0000000..21a18a3
--- /dev/null
+++ b/src/clock-live.cpp
@@ -0,0 +1,163 @@
+/*
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#include <datetime/clock.h>
+#include <datetime/timezones.h>
+
+namespace unity {
+namespace indicator {
+namespace datetime {
+
+/***
+****
+***/
+
+namespace
+{
+
+void clearTimer(guint& tag)
+{
+ if (tag)
+ {
+ g_source_remove(tag);
+ tag = 0;
+ }
+}
+
+guint calculate_milliseconds_until_next_minute(const DateTime& now)
+{
+ auto next = g_date_time_add_minutes(now.get(), 1);
+ auto start_of_next = g_date_time_add_seconds (next, -g_date_time_get_seconds(next));
+ const auto interval_usec = g_date_time_difference(start_of_next, now.get());
+ const guint interval_msec = (interval_usec + 999) / 1000;
+ g_date_time_unref(start_of_next);
+ g_date_time_unref(next);
+ g_assert (interval_msec <= 60000);
+ return interval_msec;
+}
+
+} // unnamed namespace
+
+
+class LiveClock::Impl
+{
+public:
+
+ Impl(LiveClock& owner, const std::shared_ptr<const Timezones>& tzd):
+ m_owner(owner),
+ m_timezones(tzd)
+ {
+ if (m_timezones)
+ {
+ m_timezones->timezone.changed().connect([this](const std::string& z) {setTimezone(z);});
+ setTimezone(m_timezones->timezone.get());
+ }
+
+ restart_minute_timer();
+ }
+
+ ~Impl()
+ {
+ clearTimer(m_timer);
+
+ g_clear_pointer(&m_timezone, g_time_zone_unref);
+ }
+
+ DateTime localtime() const
+ {
+ g_assert(m_timezone != nullptr);
+
+ auto gdt = g_date_time_new_now(m_timezone);
+ DateTime ret(gdt);
+ g_date_time_unref(gdt);
+ return ret;
+ }
+
+private:
+
+ void setTimezone(const std::string& str)
+ {
+ g_clear_pointer(&m_timezone, g_time_zone_unref);
+ m_timezone = g_time_zone_new(str.c_str());
+ m_owner.minute_changed();
+ }
+
+ /***
+ ****
+ ***/
+
+ void restart_minute_timer()
+ {
+ clearTimer(m_timer);
+
+ // maybe emit change signals
+ const auto now = localtime();
+ if (!DateTime::is_same_minute(m_prev_datetime, now))
+ m_owner.minute_changed();
+ if (!DateTime::is_same_day(m_prev_datetime, now))
+ m_owner.date_changed();
+
+ // queue up a timer to fire at the next minute
+ m_prev_datetime = now;
+ auto interval_msec = calculate_milliseconds_until_next_minute(now);
+ interval_msec += 50; // add a small margin to ensure the callback
+ // fires /after/ next is reached
+ m_timer = g_timeout_add_full(G_PRIORITY_HIGH,
+ interval_msec,
+ on_minute_timer_reached,
+ this,
+ nullptr);
+ }
+
+ static gboolean on_minute_timer_reached(gpointer gself)
+ {
+ static_cast<LiveClock::Impl*>(gself)->restart_minute_timer();
+ return G_SOURCE_REMOVE;
+ }
+
+protected:
+
+ LiveClock& m_owner;
+ GTimeZone* m_timezone = nullptr;
+ std::shared_ptr<const Timezones> m_timezones;
+
+ DateTime m_prev_datetime;
+ unsigned int m_timer = 0;
+};
+
+LiveClock::LiveClock(const std::shared_ptr<const Timezones>& tzd):
+ p(new Impl(*this, tzd))
+{
+}
+
+LiveClock::~LiveClock() =default;
+
+DateTime LiveClock::localtime() const
+{
+ return p->localtime();
+}
+
+/***
+****
+***/
+
+} // namespace datetime
+} // namespace indicator
+} // namespace unity
+