A library of flutter sliver implementations.
This sliver accepts two widgets: a header and a body. The header stays pinned to the top of the viewport, until the bottom edge of the overall sliver scrolls out.
The sliver allows you to reverse the normal order so that the header is at the bottom. In itself
this can be an interesting usage of the widget. There is a more interesting use for this feature
though. Slivers can be a bit tricky when using a scroll view which is centered, since from the view
of a sliver everything reverses above the center. For this sliver implementation this means that
reverse option set to
true, slivers above the center have their header at the
bottom. To implement a list which is infinite, centered and continuous in how slivers a laid out,
slivers above the center have to reverse their layout. Why would you need a list like that? A good
example is a list, which is able to lazily load new content from both sides. Without centering the
scroll view, adding new content at the top suddenly shifts everything down, make the list hard to
use, especially when content is added while scrolling. See
this example for a list, making use of
A sliver which pins its child to the start of the viewport and animates it over the duration of the
scrollExtent is total amount a user has to scroll, to move the sliver off the viewport. On the
screen the the sliver only occupies the extent of the widget built by
builder, which has to derive
ist visual representation from a RenderBox. The
builder can use the
is given, to animate the returned Widget tree.
The project is licensed under the MIT License.