ubuntu-phone team mailing list archive

[Michael Zanetti <michael.zanetti@xxxxxxxxxxxxx>]

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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