The Sacred Scrolls: Crafting Your Own Slivers
summary
Built a lazy version of a sliver that converts an existing expansion-tile sliver into an on‑demand renderer using SliverMultiBoxAdapter and the child manager methods addInitialChild, insertAndLayoutLeadingChild / insertAndLayoutChild, plus collectGarbage and calculateLeading/TrailingGarbage. ParentData stores childExtent/totalExtent/nextLayout; final layout sets SliverGeometry (scroll/layout/paint/maxPaint extents). Demo shows 7 total children but only 1 laid out until expansion expands to 7 and collapsing returns to 1; code on branch lazy sliver.
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chapters (9)
- 0:00Introduction
- 1:50Custom slivers in Flutter
- 5:10Sliver constraints and parent data
- 8:06When to build custom slivers
- 9:08SliverMultiBoxAdapter
- 12:00Lazy sliver children states
- 13:45Lazy sliver layout steps
- 20:40Live demo: lazy sliver expansion tile
- 23:15Summary
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