ubuntu-phone team mailing list archive

[Omer Akram <omer.akram@xxxxxxxxxxxxx>]

My current plan is to keep it specific to Ubuntu for now and once it
matures, start a conversation upstream.

On Mon, Apr 18, 2016 at 4:36 PM, Michael Zanetti <
michael.zanetti@xxxxxxxxxxxxx> wrote:

> Hi Omer,
>
> sounds like this is something to be brought up on the Qt development
> mailing list.
>
> Br,
> Michael
>
> On 18.04.2016 12:57, Omer Akram wrote:
> > Hi!
> >
> > While working on a pet project[1] for the Phone, an issue that I faced
> > was stuttering scrolling in listviews. QML tips page[2] suggested to use
> > Flickable+Column+Repeater combination to have smooth scrolling, that
> > worked and is currently what I have implemented in my app but I always
> > thought that was not the perfect solution.
> >
> > With some knowledge of how Android ListView works and its mechanism of
> > recycling ListView items, I wrote a hack[3] to achieve something similar
> > in QML.
> >
> > What I am doing is:
> >
> >   * Create elements visible on screen at single instance + 2
> >   * Set contentHeight to number of elements*each element height
> >   * On flick upwards, when an element goes offscreen, set its Y property
> >     to the bottom of the list.
> >   * Not handled the down flick case just yet.
> >
> > So with only a few elements created, we can reuse same elements but with
> > different data. I am not sure if there already exists some standard
> > component for that or not. If not, then this idea is open for
> > discussions and I would like to contribute it as a standard component
> > once we figure out all the details and agree on them.
> >
> > Thanks!
> >
> >
> > [1] https://launchpad.net/ubuntu-soundcloud-app
> > [2]
> https://wiki.qt.io/Performance_tip_QML_other#Fixed_length_lists_with_Flickable.2BColumn.2BRepeater
> > [3]
> http://bazaar.launchpad.net/~om26er/+junk/recycle_list_view/view/head:/RecycleListView/Main.qml
> >
> >
>
>
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