core/clock: add SystemClock

src/core/clock.cpp

@@ -0,0 +1,66 @@
+#include "clock.hpp"
+
+#include <qdatetime.h>
+#include <qobject.h>
+#include <qtimer.h>
+#include <qtmetamacros.h>
+
+#include "util.hpp"
+
+SystemClock::SystemClock(QObject* parent): QObject(parent) {
+	QObject::connect(&this->timer, &QTimer::timeout, this, &SystemClock::update);
+	this->update();
+}
+
+bool SystemClock::enabled() const { return this->mEnabled; }
+
+void SystemClock::setEnabled(bool enabled) {
+	if (enabled == this->mEnabled) return;
+	this->mEnabled = enabled;
+	emit this->enabledChanged();
+	this->update();
+}
+
+SystemClock::Enum SystemClock::precision() const { return this->mPrecision; }
+
+void SystemClock::setPrecision(SystemClock::Enum precision) {
+	if (precision == this->mPrecision) return;
+	this->mPrecision = precision;
+	emit this->precisionChanged();
+	this->update();
+}
+
+void SystemClock::update() {
+	auto time = QTime::currentTime();
+
+	if (this->mEnabled) {
+		auto secondPrecision = this->mPrecision >= SystemClock::Seconds;
+		auto secondChanged = this->setSeconds(secondPrecision ? time.second() : 0);
+
+		auto minutePrecision = this->mPrecision >= SystemClock::Minutes;
+		auto minuteChanged = this->setMinutes(minutePrecision ? time.minute() : 0);
+
+		auto hourPrecision = this->mPrecision >= SystemClock::Hours;
+		auto hourChanged = this->setHours(hourPrecision ? time.hour() : 0);
+
+		DropEmitter::call(secondChanged, minuteChanged, hourChanged);
+
+		auto nextTime = QTime(
+		    hourPrecision ? time.hour() : 0,
+		    minutePrecision ? time.minute() : 0,
+		    secondPrecision ? time.second() : 0
+		);
+
+		if (secondPrecision) nextTime = nextTime.addSecs(1);
+		else if (minutePrecision) nextTime = nextTime.addSecs(60);
+		else if (hourPrecision) nextTime = nextTime.addSecs(3600);
+
+		this->timer.start(time.msecsTo(nextTime));
+	} else {
+		this->timer.stop();
+	}
+}
+
+DEFINE_MEMBER_GETSET(SystemClock, hours, setHours);
+DEFINE_MEMBER_GETSET(SystemClock, minutes, setMinutes);
+DEFINE_MEMBER_GETSET(SystemClock, seconds, setSeconds);