[Development] Qt Quick Controls Calendar

Sun Dec 22 05:51:13 CET 2013

During the testing, we've found a bunch of bugs and other issues. I'd
suggest uploading this WIP branch to codereview, like we do for any other
stuff.

Regards,
Konstantin

2013/12/21 Mark Gaiser <markg85 at gmail.com>

> On Fri, Dec 6, 2013 at 4:11 PM, Mitch Curtis <mitch.curtis at digia.com>
> wrote:
> > On 12/06/2013 03:08 PM, Mark Gaiser wrote:
> >>
> >> On Fri, Dec 6, 2013 at 2:02 PM, Mitch Curtis <mitch.curtis at digia.com>
> >> wrote:
> >>>
> >>> Hello.
> >>>
> >>> At the beginning of this year I started work on a Calendar for Qt Quick
> >>> Controls as a sort of side project. After removing the "WIP" from the
> >>> commit message, I got some feedback from developers who either a) had
> >>> also wrote a Calendar for KDE stuff or b) suggested I ask for feedback
> >>> from plasma-devel. Rather than add to the already massive list of patch
> >>> sets for that change, I thought it would be better to truly open up the
> >>> Calendar for contributions before it goes in by creating a WIP branch
> >>> for it in the Qt Quick Controls repo [1]:
> >>>
> >>> wip/calendar
> >>>
> >>> It'll be a throwaway branch, so every commit must be atomic and follow
> >>> all of the normal Qt commit policies [2][3]. At the end, we'll resubmit
> >>> every individual change to qtquickcontrols' dev branch.
> >
> >
> > I've been told that this is incorrect; the correct statement is:
> >
> > "even though this is a throw-away branch (whose commits will be
> re-submitted
> > to dev individually), the usual policies should be followed"
> >
> >
> >>> Please feel free to submit patches or provide feedback on what's
> already
> >>> there. For example, it has already been suggested that there should be
> a
> >>> C++ backend for the models, dates, etc.
> >>>
> >>> Cheers.
> >>>
> >>> [1]
> >>>
> >>>
> https://qt.gitorious.org/qt/qtquickcontrols/source/4c3196c979d9a7f46b3f37b14140026dd74bf79a
> >>> [2] http://qt-project.org/wiki/Branch-Guidelines
> >>> [3] http://qt-project.org/wiki/Commit_Policy
> >>
> >>
> >> Hi Mitch,
> >>
> >> It's awesome that you pull in the KDE plasma folks. I wonder who gave
> >> you that idea? ;)
> >>
> >> Below is my "feature" list that i'd like to have in that calendar.
> >> Since i have some experience in that area i will try to help out as
> >> much as i can.
> >>
> >> -- QML part --
> >> * Controls for the calendar grid
> >> * Controls for next/forward or just a few functions. This should at
> >> least have a nextMonth/previousMonth. Perhaps also nextYear and
> >> previousYear for convenience.
> >> * Controls for the day names (mon, tue, wed, thu, fri, sat, sun). And
> >> the ability to change the name to shorter/longer variants.
> >> * Controls for the weeknumbers that are shown in the grid.
> >>
> >> As far as i understand the QML code, all but the weeknumbers are in.
> >
> >
> > Yep.
> >
> >
> >> -- Locale --
> >> In KDE there was already an issue with differences between the
> >> JavaScript date object and the QDate object. I don't know the fine
> >> details here, someone else will probably fill that in i hope. I know
> >> there where issues, just not what exactly.
> >
> >
> > From the testing that I did with it [1], it has some differences when
> it's a
> > negative year, so the current implementation of the Calendar only allows
> > positive years, up to the year 275759; a significantly smaller range than
> > QDate [2].
> >
> >
> >> -- C++ part --
> >> This is the part where i really would like some feedback. I have a
> >> general idea of how it should be done, but i don't know the details or
> >> implications it might have.
> >> It is my hope that calendar controls like Mitch is proposing now will
> >> be extensive enough to simply swap the models to another backend.
> >> Akonadi comes to mind. However, there should obviously be a
> >> non-akonadi based version for default Qt usage.
> >>
> >> My idea on that is as follows. Again, i don't know the implications of
> >> it or if it's really viable to take this route. Feedback is very much
> >> welcome here!
> >> The calendar model should be based on a new model that provides some
> >> default functionality and properties. I would say:
> >> QAbstractCalendarModel : public QAbstractListModel { ... }
> >> This model should provide the default - should be implemented -
> >> properties:
> >> * day -- INT number of the day in a current month
> >> * isCurrentMonth -- returns true for the current month (aka, the month
> >> you are viewing in the calendar). Returns false for the days before
> >> and after the currently viewing month. Based on the position in the
> >> grid you can then calculate if the entry where "isCurrentMonth"
> >> returns false is before or after the current month.
> >> * containsEvents -- true if the day contains events, false otherwise
> >>
> >> "day" and "isCurrentMonth" should be convenience implemented in the
> >> QAbstractCalendarModel.
> >>
> >> Next there should be a model for core Qt calendar usage. Or in other
> >> terms: no akonadi dependency.
> >> That would be a class like:
> >> QSimpleCalendarModel : public QAbstractCalendarModel { ... }
> >>
> >> That class should probably have some basic storage in json files
> >> somewhere? Or ini or sqlite or..? Just something so that it can be
> >> used out of the box without any other requirements beyond Qt.
> >> Till this point is what would probably go in Qt. Everything after this
> >> line becomes Akonadi specific and should not be in Qt.
> >>
> >> If a structure like the above is approved then Akonadi can be very
> >> easily used in KDE with the Qt calendar components.
> >> We'd just have to make out own QAbstractCalendarModel implementation
> >> that uses akonadi data. That would be a class like:
> >> (K)AconadiCalendarModel : public QAbstractCalendarModel { ... }
> >>
> >> It can still use the base QAbstractCalendarModel implementation for
> >> it's grid stuff and re-implement the "containsEvents" property to be
> >> filled with data from akonadi.
> >
> >
> > As you may know, John Layt has some calendar stuff in the works for 5.3
> [3].
> > It would be great to get his feedback, although I know he's quite busy.
> >
> >
> >>
> >> Well, that's it for my idea thus far. I'm looking forward to some
> >> opinions on this.
> >>
> >
> > [1]
> >
> https://codereview.qt-project.org/#patch,sidebyside,73340,1,src/controls/Private/qquickrangeddate.cpp
> > [2] http://doc-snapshot.qt-project.org/qt5-stable/qdate.html#details
> > [3] http://qt-project.org/wiki/Qt-5-ICU#955c0120c32f7991db7d55a94df808c2
>
> Bump.
>
> I hope some of the plasma folks can provide some feedback on the ideas
> proposed in this thread.
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