feat: virtualize LessonCarousel and QuizCarousel with FlatList#451
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RUKAYAT-CODER merged 2 commits intoMay 28, 2026
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- Replace horizontal ScrollView with FlatList in both carousels - Set windowSize=3, maxToRenderPerBatch=1, initialNumToRender=1 - Add removeClippedSubviews to unmount off-screen items - Add getItemLayout for O(1) scroll-to-index - Add 20 tests covering windowing props, scroll callbacks, and 1000+ item scale
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feat: Virtualized gallery/carousel for efficient memory usage
Replaces the eager-rendering ScrollView in LessonCarousel and QuizCarousel with
a virtualized FlatList, so only the visible item plus one buffer on each side
is kept in memory at any time.
Changes
maxToRenderPerBatch=1, initialNumToRender=1, removeClippedSubviews, and
getItemLayout for O(1) scroll-to-index
needed with FlatList
1000+ item scale
Impact
N)
Testing
All 20 carousel tests pass. Verified getItemLayout returns correct offsets at
index 999 without iteration.
closes #389