Fast Table scroll steps

> On 07 Jul 2015, at 16:41, Stephan Eggermont <[hidden email]> wrote:
>
> I don't understand the step size of the fast table scroll bar.
> What does container bottom have to do with delta & pageDelta?
>
> recalculateVerticalScrollBar
> | interval delta pageDelta visibleRows numberOfRows |
>
> self hasDataSource ifFalse: [ ^ self ].
>
> self recalculateVerticalScrollBarVisibilityIfHidden: [ ^ self ].
>
> visibleRows := self container calculateExactVisibleRows.
> numberOfRows := self dataSource numberOfRows.
> interval := (visibleRows / numberOfRows) asFloat.
> delta := 1/(self container bottom).
> pageDelta := (self innerBounds height - 10) / (self container bottom).
> self verticalScrollBar
> scrollDelta: delta pageDelta: pageDelta;
> interval: interval
>
>

> On 07 Jul 2015, at 16:58, Esteban Lorenzano <[hidden email]> wrote:
>
> no idea :)
> in fact, I was trying to fix that right now (scroll bars are not working well in FT, yet).
> most of this I took it from older list implementation and I’m not quitte sure how they work.
>
> I think a better implementation would be:
>
> recalculateVerticalScrollBar
> | interval delta pageDelta visibleRows numberOfRows |
>
> self hasDataSource ifFalse: [ ^ self ].
>
> self recalculateVerticalScrollBarVisibilityIfHidden: [ ^ self ].
>
> visibleRows := self container calculateExactVisibleRows.
> numberOfRows := self dataSource numberOfRows.
> interval := (visibleRows / numberOfRows) asFloat.
> delta := 1/visibleRows.
> pageDelta := (self innerBounds height - 10) / visibleRows.
> self verticalScrollBar
> scrollDelta: delta pageDelta: pageDelta;
> interval: interval
>
>
> but it still does not feels “good”.
> Any help here is welcome :)
>
> Esteban
>
>
>> On 07 Jul 2015, at 16:41, Stephan Eggermont <[hidden email]> wrote:
>>
>> I don't understand the step size of the fast table scroll bar.
>> What does container bottom have to do with delta & pageDelta?
>>
>> recalculateVerticalScrollBar
>> | interval delta pageDelta visibleRows numberOfRows |
>>
>> self hasDataSource ifFalse: [ ^ self ].
>>
>> self recalculateVerticalScrollBarVisibilityIfHidden: [ ^ self ].
>>
>> visibleRows := self container calculateExactVisibleRows.
>> numberOfRows := self dataSource numberOfRows.
>> interval := (visibleRows / numberOfRows) asFloat.
>> delta := 1/(self container bottom).
>> pageDelta := (self innerBounds height - 10) / (self container bottom).
>> self verticalScrollBar
>> scrollDelta: delta pageDelta: pageDelta;
>> interval: interval
>>
>>
>

> On 07 Jul 2015, at 17:43, Stephan Eggermont <[hidden email]> wrote:
>
> Something like
>
> visibleRows := self container calculateExactVisibleRows.
> numberOfRows := self dataSource numberOfRows.
> interval := (visibleRows / numberOfRows) asFloat.
> delta := 1/numberOfRows.
> pageDelta := ((visibleRows-1) floor)*delta.
> self verticalScrollBar
> scrollDelta: delta pageDelta: pageDelta;
> interval: interval
>
> pagedelta is still off first time.
>
> Stephan
>
>