In qml GridView,which property will influence scroll speed?

sfjam · wrote on 6 Jul 2011, 00:27

hi everyone! i use QML GridView write a application program on cellphone,but when i drag the screen,it scrolls very slow,so i want to ask you which property will influence scroll speed in GridView?thank you very much!

tigriswind · wrote on 6 Jul 2011, 05:29

you can use the listview .and set the contentX or contentY dirently when drag event accurs

task_struct · wrote on 6 Jul 2011, 06:05

Take a look at "horizontalVelocity and verticalVelocity":http://doc.trolltech.com/4.7-snapshot/qml-flickable.html#horizontalVelocity-prop

sfjam · wrote on 6 Jul 2011, 07:08

but this horizontalVelocity and verticalVelocity propertise is just
read-only,we cann't assign to it!

task_struct · wrote on 6 Jul 2011, 07:32

Ohh, Im sorry. I didnt see the read-only flag :(

There is also maximumFlickVelocity property. It is not read-only. May it will help :)

lgeyer · wrote on 6 Jul 2011, 07:33

"GridView.maximumFlickVelocity":http://doc.qt.nokia.com/4.7-snapshot/qml-flickable.html#maximumFlickVelocity-prop

sfjam · wrote on 7 Jul 2011, 03:49

but why it also slow,it seems have not change!

lgeyer · wrote on 7 Jul 2011, 05:54

Have you tried building a Desktop version of your application?

If velocity does not change it is most likely a software problem.
If velocity changes it is most likely a hardware problem (limited resources).

sfjam · wrote on 7 Jul 2011, 08:06

i did a test,when i just use a ListView,the speed is ok,but when i use two views which are GridView and ListView,it response very slow,so how to solve this problem?

itwiz · wrote on 8 Jul 2011, 11:10

You can use cacheBuffer to cache some delegates outside visible area.That can help in smooth scrolling.
How complex is your grid delegate ? Simpler the delegate better will be scrolling.