[Kde-pim] KTimeZoneSource to Qt5

[John Layt]

Hi,

KTimeZoneSource was the backend for each platform, which Qt implements
in the private class so we shouldn't need one of those for that
purpose. The implementation model is very different, on it's own it is
not as complex/flexible as KTimeZone, but most of KTimeZone's
complexity went unused anyway.  The main thing missing really is the
automatic caching of loaded QTimeZone objects which was considered not
appropriate for the main toolkit, so we will need to implement our own
system for that. I do have Qt patches for a QTimeZoneDatabase class to
support loading tz files on all platforms including Windows which
could have a caching policy added if needed, but I've had no time for
Qt hacking the last 6 months so it's all on hold. Same reason I
haven't been able to look at porting the tz parts of KCalCore myself
as I promised.

Basic custom time zones are supported by the third constructor where
ianaId is a unique id *not* used by he iana tz file:

QTimeZone::QTimeZone(const QByteArray & ianaId, int offsetSeconds,
constQString & name, const QString & abbreviation, QLocale::Country
country = QLocale::AnyCountry, const QString & comment = QString())

Supporting anything more complex than simple number of offset seconds,
i.e. custom dst calculation rules was also considered outside mainline
Qt's scope at the time. If that is required then we can try address
that in Qt or by wrapping things. I did have some ideas on that, but
I've have to dig out my notes to see what those were.

John.


On 22 February 2015 at 18:42, Sergio Martins <iamsergio at gmail.com> wrote:
> Hi guys,
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> I see KTimeZoneSource is in kdelibs4support, but has no kf5/Qt5 counterpart.
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> So we need a KTimeZoneSource based on QDateTime/QTimeZone before starting to
> port KCalCore to QDateTime I guess ?
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> Also, QTimeZone only accepts iana time zones, not custom ones, like the ones
> we need to create when reading ical VTIMEZONEs, so we would need to patch Qt
> ?
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> Regards,
>
> Sérgio Martins
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