# Provenance lens A React component in [Beamline](https://beamline.io/)'s [Data & tables](https://beamline.io/components/data) category. Live demo: https://beamline.io/components/provenance-lens Hold Alt (or press Lens) over any number on the page and see what makes it: hairline threads draw from the number to the rows, cards and documents on screen that make it, the formula sits beside it in words, sources out of view gather as a counted stack at their panel's edge, unknown and locked sources say so, and a click goes one level deeper to the sources' own sources with how fresh each is, while a trail across the top reads the chain. Every number is also a button that lists its sources. ## Use it for - A page of numbers people have to defend or don't trust: an owner's dashboard, a stock count, a team's cost, an audit view. - The host already renders the rows and documents; it adds data-ref to them and a graph of what makes each number. ## Not for - One total explained step by step with levers → [explainable-total](https://beamline.io/components/explainable-total). - A record's history over time → a timeline or the replay bar. ## Anatomy - region: the bar (the Lens button, the hint with the Alt key, or the trail while showing), the host's page, the lens's layer over it - value (a button) inside the host's page: the number as the host writes it - layer while showing: threads (hairlines from the number to each visible source, role marks + and − where they land), the formula chip beside the number (formula in words, mismatch, estimate, freshness, unknown and locked chips, the deeper hint), stacks at a panel's bottom edge for sources out of view, freshness tags on deeper sources - list (Enter on a number): the number, the formula, each part with its amount, its sources on the page with Show, the count not on this page, unknown, no access, freshness ## States - rest - lens on (held or kept) - showing a number (level 1) - deeper (level 2 and on) - unknown source - no access - stale source - estimate - mismatch - list open ## Keyboard - Tab reaches each number; Enter (or Alt+Enter) opens its list of sources; Escape closes it and returns to the number - In the list, Show scrolls to that source on the page and marks it - The Lens button keeps the lens on: Tab to a number to draw its threads, Enter on it to go one level deeper; Escape (outside a source list) turns the lens off; Alt does nothing while typing in a field - Holding Alt while focus is in the region turns the lens on while held - The formula and the chain are read out as a polite status; the threads are decoration ## Motion Threads draw in from the number on the line stagger, chips and stacks fade in; everything happens only while the lens is on and nothing runs at rest. Reduced motion places them. ## Props | Prop | Type | Default | Description | | --- | --- | --- | --- | | `graph` (required) | `ProvenanceGraph` | — | Every number and source the lens can explain, by ref. | | `children` (required) | `ReactNode` | — | The page or dashboard: values (`ProvenanceValue`) and sources (`data-ref`) anywhere inside. | | `currency` | `string` | — | ISO code for the lens's own amounts (its list of parts); the page's numbers stay as the host wrote them. | | `format` | `((amount: number) => string)` | — | The lens's own amounts in the host's format; it wins over `currency` and never touches the children. | | `now` | `Date` | — | "Now" for freshness; default the time of drawing. | | `active` | `boolean` | — | The lens kept on (the Lens button); Alt held turns it on while held. | | `defaultActive` | `boolean` | — | | | `onActiveChange` | `((active: boolean) => void)` | — | | | `className` | `string` | — | Classes on the documented visual root; no override by default. | | `classNames` | `Partial` | — | Receives the documented native target or imperative handle; omitted by default. | | `ProvenanceValue.of` (required) | `string` | — | On ProvenanceValue: Its ref in the lens's graph (and its own `data-ref`, so other numbers can point at it). | | `defaultTarget` | `string` | — | The number the lens opens on, by ref (with the lens on): its threads drawn at once, as if pointed at. | ## Built from - [Bottom sheet](https://beamline.io/components/bottom-sheet.md) - [Button](https://beamline.io/components/button.md) - [Kbd](https://beamline.io/components/kbd.md) - [Popover](https://beamline.io/components/popover.md) - [Spinner](https://beamline.io/components/spinner.md) ## Dependencies `lucide-react` ## Import ```tsx import { ProvenanceLens, ProvenanceValue } from "@beamline/provenance-lens"; ``` ## Get it Provenance lens is part of Beamline UI. Install the parts you need in your React app as compiled packages or editable source. 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