⚡ Bolt: Optimize PasswordScreen FlatList rendering - #185
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Extracted FlatList renderItem into a memoized useCallback and stabilized row callbacks to prevent unnecessary re-renders of the entire list. Also added windowSize to reduce memory footprint. Co-authored-by: TargetMisser <52361977+TargetMisser@users.noreply.github.com>
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| const renderItem = useCallback(({ item }: { item: PasswordEntry }) => ( | ||
| <PasswordRow | ||
| item={item} | ||
| onEdit={openEdit} | ||
| onDelete={deleteEntry} | ||
| /> | ||
| ), [openEdit, deleteEntry]); |
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When pinMode switches from null to 'unlock' or 'setup' after a normal render, this new useCallback is skipped because the component returns the PIN overlay above it, changing the hook order between renders. That breaks the PIN flows with React's “rendered fewer hooks than expected” runtime error; define this hook before the pinMode early returns or avoid using a hook here.
Useful? React with 👍 / 👎.
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💡 What:
Extracted
renderItemusinguseCallbackinPasswordScreen.tsxand modified thePasswordRowComponentcallbacks to prevent inline arrow function instantiation during rendering. AddedwindowSize={5}toFlatList.🎯 Why:
Using inline arrow functions for
renderItemand item callbacks creates new function references on every render. This completely defeated theReact.memowrapping onPasswordRow, forcing re-renders for every single item in the list even if nothing changed.📊 Impact:
Significantly reduces re-renders of the password list. Reduces memory footprint and CPU cycles, making scrolling and screen interactions noticeably smoother, especially as the user adds more items to their password manager.
🔬 Measurement:
You can verify the improvement by using the React DevTools Profiler while typing a PIN or interacting with the screen. You'll see
PasswordRowno longer re-renders unnecessarily compared to the previous state.PR created automatically by Jules for task 10315265784027846532 started by @TargetMisser