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079ba35207
* feat(web-shell): add selection statistics * fix(web-shell): clear stale table selections * fix(web-shell): address selection statistics review
59 lines
2.5 KiB
Markdown
59 lines
2.5 KiB
Markdown
# Web Shell Table Selection Statistics
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## Summary
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Add a read-only statistics strip to advanced Web Shell markdown tables. When a
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user selects cells, the existing toolbar will show selected, non-empty, and
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numeric counts. If the selection contains numeric values, it will also show
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sum, average, minimum, and maximum.
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The standalone daemon Web Shell enables advanced markdown tables so the new
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statistics and the existing table interactions are available in that surface.
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## Goals
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- Make quick numerical inspection possible without copying data into Excel.
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- Keep statistics aligned with the existing visible-cell selection and TSV
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copy behavior.
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- Reuse the table's existing number parser so sorting, filtering, and
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statistics agree.
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- Preserve recognizable percent and currency formatting when the selected
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numeric cells use one consistent format.
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## Non-goals
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- Formula evaluation, unit conversion, date statistics, or editable cells.
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- Discontiguous selections or statistics over filtered-out and hidden cells.
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- User-configurable metrics, popovers, or new dependencies.
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## Behavior
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Statistics are computed from the selected rectangle in `visibleRows` and the
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currently visible column order. Blank cells count as selected but not
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non-empty. Text cells count as non-empty but not numeric. Arithmetic metrics
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use numeric cells only, and are hidden when no numeric cells are selected.
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The toolbar renders compact inline metrics. It retains the existing TSV copy
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action and wraps naturally on narrow screens.
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Uniform percent selections display arithmetic results as percentages. Uniform
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currency selections retain their common currency symbol. Mixed numeric formats
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fall back to locale-formatted plain numbers.
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## Implementation
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Add a pure selection-statistics helper alongside the existing selection and
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clipboard helpers. The component derives its result with `useMemo`; no new
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mutable state is required. Add small formatting helpers for locale-aware
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numbers, percentages, and common currency symbols.
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The enhanced table limit is 500 rows by 50 columns, so a full-selection scan is
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bounded at 25,000 cells. The existing animation-frame throttling for drag
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selection keeps recomputation within the current interaction cadence.
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## Verification
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Unit tests cover numeric, mixed text/blank, currency, percent, reordered,
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hidden-column, filtered, updated-data, and localized selections. A daemon Web
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Shell browser check verifies drag selection, live metric updates, and wrapping
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in the rendered UI.
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