how can I set flickable pixels(width) in Flickable by one flick?

[beidaochuan]

how can I set flickable pixels(width) in Flickable by one flick?
In fact I want to implement a function as ListView.SnapOneItem in ListView.

[beidaochuan]

Is horizontalVelocity useful?

[beidaochuan]

Should I implement it with inheriting QQuickListView or QQuickItemView??