The Sacred Scrolls: Crafting Your Own Slivers

Delve into advanced Flutter rendering by harnessing RenderSliverMultiBoxAdaptor, RenderObjectElement, and a tailored SliverChildDelegate to craft slivers that lazily build and recycle children on-demand.

I’ll begin with a concise overview of Slivers, the RenderSliver family, and how these three classes collaborate inside Flutter’s widget–element–render pipeline.

Next we will walk step-by-step through a practical example, designing and implementing a custom sliver that keeps memory low while scrolling remains butter-smooth.

We will explore how to lay out and paint the sliver and its children, touching briefly on how SliverConstraints and SliverGeometry provide the scroll metrics that drive those calculations.

Lastly we will make the sliver interactive—wiring up hit-testing, gestures, and a dash of custom paint to achieve the exact look and feel your design calls for.

This session will deepen your understanding of Flutter’s rendering engine and give you the knowledge to create your own custom widget using a more low-level API.