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? 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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