timezonemanager.cpp

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++ // Copyright (C) 2025 The Qt Company Ltd.

++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

++

++ #include "timezonemanager.h"

++ #include "dialog.h"

++

++ #include <memory>

++

++ TimeZoneManager::TimeZoneManager(QObject *parent) : QObject(parent)

++ {

++     setTimeZone(QString::fromLatin1(QTimeZone::systemTimeZoneId()));

++ }

++

++ TimeZoneManager::~TimeZoneManager() { }

++

++ void TimeZoneManager::openDialog()

++ {

++     if (!m_dialog) {

++         m_dialog = std::make_unique<Dialog>();

++         m_dialog->setModal(true);

++         connect(m_dialog.get(), &Dialog::timeZoneSelected, this, &TimeZoneManager::setTimeZone);

++     }

++     m_dialog->show();

++ }

++

++ qint64 TimeZoneManager::currentTimeZoneOffsetMs()

++ {

++     const QTimeZone tz(m_timeZone.toLatin1());

++     if (!tz.isValid())

++         return 0;

++     const QDateTime nowUtc = QDateTime::currentDateTimeUtc();

++

++     const int targetOffset = tz.offsetFromUtc(nowUtc);

++     const int systemOffset = QTimeZone::systemTimeZone().offsetFromUtc(nowUtc);

++

++     return (targetOffset - systemOffset) * 1000;

++ }

++

++ void TimeZoneManager::setTimeZone(const QString &timeZone)

++ {

++     if (m_timeZone != timeZone) {

++         m_timeZone = timeZone;

++         emit timeZoneChanged();

++     }

++ }