[maemo-developers] New apps for fremantle with Qt?

[From: Antonio Aloisio]

Hi there,

Analizing the hildon widget that people want to have in Qt, I can say that:
There are "hildon/ized" widgets that will be part of Qt itself and Qt hildon
widgets that will come from a different lib (not implemented yet).
Some "essential" widgets like Hildon stackable windows and Maemo5 menus will
be part of Qt GUI module.
They have been already coded and the code is in our git repository.

Qt is able to use Hildon Native dialogs (eg: File dialogs). We can support
others Hildon dialogs just adding a couple of
lines in the style.

The rest of hildon widgets that won't be part of Qt itself and they will be
part of another project that me, David and maybe other people interested in
can do togheter.

Ciao,
Antonio



On Mon, Sep 7, 2009 at 11:06 AM, David Greaves <david at dgreaves.com> wrote:

> Karoliina.T.Salminen at nokia.com wrote:
> >> If you have custom widgets in every program on a system, users will find
> >> it harder to use. They will not know what to expect when they tap on a
> >> widget they never saw before... that's the point of having guidelines.
> >
> > Please read my sentences above. I meant about replicating the
> functionality of the widget
> > done with other technology with another and ending up with exactly the
> same user experience.
> > It is possible and the guidelines can be followed to create the new
> widgets.
> > There is nothing that prevents that, it is just some additional work
> required for the developer
> > as there are hildon widgets lacking from the selection of widgets on the
> Qt side.
> Agreed.
> I've asked Antontio to start a project so we can create a set of
> hildon-widgets.
>
> What would be good would be some collaboration on creating a prioritised
> list
> and documenting the required behaviour.
>
> http://wiki.maemo.org/Qt4_Hildon#Where_are_the_Hildon_Widgets_for_Qt
> http://wiki.maemo.org/Qt4_Hildon/Qt_Hildon_Widgets
>
> > If you compare the kinetic scroll list on the startup wizard to the
> kinetic scroll list elsewhere,
> > you may find that it functions the same way, despite that is Clutter and
> elsewhere it is Gtk.
> > Similarly I am sure it can be done also with the Qt in the same way, so
> that as end user you can't see the difference
> > (except that on different toolkits there may be slight performance
> differences, e.g. pure clutter
> > can be obviously faster than Gtk and similarly the performance may differ
> on the Qt version to direction or another
> > depending on the case).
> >
> > It just requires accurate tuning for all the parameters to get the scroll
> behavior exactly the same and
> <snip>
>
> > What comes to the kinetic scroll list, it has certain little details that
> are important, otherwise it will feel different (and not right):
> > - edge bounce
> > - easing on edge bounce (the movement decelerates before it stops instead
> of stopping mechanically)
> > - friction
> > - inertia
> > - scrolling speed (comes from the physics of the friction, inertia, and
> the initial speed given by the finger)
> > - finger following
> > - item selection sensitivity from touch
> > - item deselection sensitivity from following movement
> > - stoppable movement (despite of high inertia, stopped finger stops the
> movement immediately)
> >
> > To get these right, it really requires trying out on the device how it
> feels. When doing the startup wizard we found that
> > some sensitivities (e.g. selection sensitivity) need to be a bit
> different when operated on mouse than when operated on finger on the device.
> I (and others) wrote the Qt fingerscroll that we have (had?) in
> experimental.
> All those factors are parameters.
> It also works on any scroll-based widget 'for free' and allows highlighting
> and
> drag'n'drop.
> I completely agree that it needs tuning on the device... sadly I don't have
> one... but if someone wants to send me one...
>
> > Once the list is perfected, all the other widgets are easily composited
> from these lists and other widgets.
> > So it is a good idea to start from making a list on Qt to function
> exactly like it functions on the Hildon.
> I've asked Antontio to start a project so we can create a set of
> hildon-widgets.
>
> IIRC we also need to do dbus integration too.
>
> David
>
>
> --
> "Don't worry, you'll be fine; I saw it work in a cartoon once..."
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-- 

Mike Ditka <http://www.brainyquote.com/quotes/authors/m/mike_ditka.html>  -
"If God had wanted man to play soccer, he wouldn't have given us arms."
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