On Mon, Apr 18, 2016 at 4:41 PM, Andrea Bernabei < andrea.berna...@canonical.com> wrote:
> > > On Mon, Apr 18, 2016 at 11:57 AM, Omer Akram <omer.ak...@canonical.com> > 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! >> >> > Hi Omer, > > I've got some early feedback :) I haven't had a proper look at the code > yet but, if I understood it correctly, the idea is repositioning Items > which are inside a Column. > Isn't that against what Column is for? > Thanks for the response, >From what I understand, its repositioning the whole column instead of elements inside. But that may be my lack of understand of how Repeater works ;-) > > Cheers, > Andrea > > >> >> [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 >> >> -- >> Mailing list: https://launchpad.net/~ubuntu-phone >> Post to : ubuntu-phone@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~ubuntu-phone >> More help : https://help.launchpad.net/ListHelp >> >> >
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