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Subsurface uses "local time" which in particular means we never
display time zone information to the user. The user (and our file
format) only sees times like 5pm or 17:00. A better name than
local time (which could mean "local at the dive spot) would
be "watch time", the time displayed by the diver's watch when
she entered the water.
Internally, we store times as time_t, seconds since Jan 1 1970 0:00
UTC. Our convention for conversion between 5pm and time_t as always
been to treat 5pm as if it were UTC.
Then confusion arose since Qt's QDateTime (which is tied to UI elements
like QTimeEdit and similar) is time zone aware and by default assumes
the system time zone. So when we set a QDateTime to 5pm and then later
convert it to time_t we have to take care about the difference between
UTC and the system time zone.
This patch unifies our solution to this problem: With it, we set all
QDateTime's time zone to UTC. This means we don't have to correct for
a time zone anymore when converting to time_t (note, however, the
signedness issue: Qt's idea of time_t is broken since it assumes it
to be unsigned thus not allowing for dates before 1970. Better use the
millisecont variants).
We only need to be careful about time zones when using the current time.
With this convention, when assigning the current time to a QDateTime, we
need to shift for the time zone since its value in UTC should actually be
the watch time of the user who is most likely used to the system time zone.
Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Qt 5.6.0 is broken when it comes to using CoreLocationService on iOS.
It doesn't even check if the location service is enabled. My patches fix
that and make Qt set an error code right after service creation. Having
the service creation fail is actually the wrong thing to do because then
Qt switches over to GeoClue and that really isn't helpful for our needs
here.
Additionally, Qt 5.6.0 without my patches doesn't follow the REQUIRED
flow of using the location service as it does not check the access
permissions before accessing the GPS service - without doing so the
GPS service will not run in the background.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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If the GPS source returns an error that could be an indication that the
user hasn't given us permission to use it, so switch our status to NOGPS.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Initially we don't know if we have a source. After that we may think
that we have one, or not have one (but that can actually change while
the program is running if the user, for example, turns the source off
or switches to airplane mode).
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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I couldn't figure out how to break this down into small, useful commits.
Part of the problem is that I kept going while working on this and as you
can see from looking at the commit, diff tries so hard to find small code
fragments that moved around, that the diff overall becomes quite
unreadable and it seemed impossible to recreate the sequence of steps
after the fact.
It all started with adding the parsing for the GPS coordinates. But while
testing that code I found several issues with the rest of the function.
Most importantly it seemed ridiculous that we carefully tried to match the
texts that the DiveObjectHelper would create for the various fields,
instead of just using the DiveObjectHelper to do just that. And once I had
converted that I once again realized just how long and hard to understand
that function was getting and decided to break out some of the more
complex parts into their own helper functions.
But of course all this didn't happen in this logical, structured, ordered
way. Instead I did all of these things at the same time, testing,
rearranging, etc.
So in the end I went with one BIG commit that does all of this in one fell
swoop.
This adds four helper functions to deal with start time/date, duration,
location and gps coordinates, and depth of the dive.
To avoid mistakes when dealing with the GPS coordinates, there's another
helper to encapsulate the creation of the dive site and we switched to a
current GPS location.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Having subsurface-core as a directory name really messes with
autocomplete and is obviously redundant. Simmilarly, qt-mobile caused an
autocomplete conflict and also was inconsistent with the desktop-widget
name for the directory containing the "other" UI.
And while cleaning up the resulting change in the path name for include
files, I decided to clean up those even more to make them consistent
overall.
This could have been handled in more commits, but since this requires a
make clean before the build, it seemed more sensible to do it all in one.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Robert C. Helling
Dirk Hohndel