The scrollbar implementation prior to this change only adjusted
list.Position.Offset. This works in all circumstances except when
list.Position.BeforeEnd=false. If the position indicates that the
scroll position is at the end of the list, the offset is ignored.
This change ensures that manually dragging the scrollbar always
causes BeforeEnd to be set to true. If the drag ends with the
scrollbar at the end of the list, BeforeEnd will be set
automatically by the next list.Layout call, so this doesn't
prevent the list from optimizing for that case in general.
Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
To use these lists instead of layout.List, callers simply need to
change declarations of layout.List to widget.List, and to change
calls to layout.List.Layout to material.List(th,&list).Layout.
So this:
var list layout.List
list.Layout(gtx, 10, func(gtx C, index int) D {
return material.Body1(th, fmt.Sprintf("%d", index)).Layout(gtx)
})
Becomes:
var list widget.List
material.List(th, &list).Layout(gtx, 10, func(gtx C, index int) D {
return material.Body1(th, fmt.Sprintf("%d", index)).Layout(gtx)
})
Naturally, the material.ListStyle type supports tweaking the scrollbar's
appearance and behavior.
Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
Chris Waldon