Wish xCustomListView - ScrollToItem speed property.

[LucaMs]

A property to be able to set the scrolling speed when using the ScrollToItem method.

 

[Alexander Stolte]

will not be possible, since this function is native.

 

[Alexander Stolte]

Thats the code:

'Smoothly scrolls the list to the specified item.
Public Sub ScrollToItem(Index As Int)
    Dim offset As Float = Min(GetMaxScrollOffset, FindItemOffset(Index)) 'ignore
    #if B4i
    Dim nsv As ScrollView = sv
    If horizontal Then
        nsv.ScrollTo(offset, 0, True)
    Else
        nsv.ScrollTo(0, offset, True)
    End If
    #else if B4J
    JumpToItem(Index)
    #Else If B4A
    
    If horizontal Then
        Dim hv As HorizontalScrollView = sv
        hv.ScrollPosition = offset 'smooth scroll
    Else
        Dim nsv As ScrollView = sv
        nsv.ScrollPosition = offset
    End If
    #End If
End Sub

 

[Alexander Stolte]

in the thread is an example how to implement this with a timer

ASViewPager Library (Smoother Scrolling Transition) (SOLVED)

Hi All, i am using this very nice Library found here I see that is based on a CustomListView, I was wondering if there is a way to add smoother scrolling transition when going from page to another. What I'm doing is that I am disabling the finger swipe feature and adding a button so that the...

www.b4x.com

 

[LucaMs]

will not be possible, since this function is native.

PLUS

in the thread is an example how to implement this with a timer

EQUAL:

Erel can implement it using a timer.





BTW looking for methods and properties of ScrollView in the official Android documentation, I found that from API 22.1 there is a NestedScrollView that we don't know about.

 

[Erel]

Example of auto-scrolling with xCLV: https://www.b4x.com/android/forum/threads/customlistview-scroll-with-timer.131919/#post-833206

 

[LucaMs]

Example of auto-scrolling with xCLV: https://www.b4x.com/android/forum/threads/customlistview-scroll-with-timer.131919/#post-833206

It is not the same as being able to slow down the speed of ScrollToItem as much as you should calculate ScrollViewOffsetY (or ScrollViewOffsetX) based on the index.

I could do it, I would have to develop some sort of my own xCLV, as you have done in other cases (eg CVLExpandable) but if it were implemented internally it would be much better for everyone.

 

[LucaMs]

It is not the same as being able to slow down the speed of ScrollToItem as much as you should calculate ScrollViewOffsetY (or ScrollViewOffsetX) based on the index.

I could do it, I would have to develop some sort of my own xCLV, as you have done in other cases (eg CVLExpandable) but if it were implemented internally it would be much better for everyone.

To do it myself I should have these functions (to be made public):

Dim offset As Float = Min(GetMaxScrollOffset, FindItemOffset(Index)) 'ignore

but I still think it would be much better if it implemented within the official xCLV.