Clyune Component GalleryBento Grid · How it works & code
Bento layout uses the same grid to let certain cards span across multiple columns and rows, creating a clear hierarchy of content, commonly seen in product landing pages and dashboards.
Runtime logic
Visiting `/layout/bento`, DemoHost lazy-loads `demos/kits/kit-layout.js` (registry `mod: 'kit-layout'`) and calls `mount(host, { variant: 'bento' })`. mount resolves the variant to family `bento`; `withControls` builds the control panel (6 presets + sliders). `createCanvasStage` creates the `<canvas>` (HiDPI ≤ 2×, ResizeObserver) and the info panel. The family’s `build(S)` initialises state and returns the per-frame callback. Every `requestAnimationFrame`: read controls, advance a speed-scaled clock (dt ≤ 50 ms), run the frame callback; returned readouts go to the info panel. Changing parameters: colour/speed/size apply live; structural ones remount; leaving the page cancels rAF, removes listeners and frees resources.
Environment
Canvas 2D: 2D canvas drawing; requestAnimationFrame: Display-synced animation loop; ResizeObserver: Canvas follows container size; Pointer Events: Unified mouse/touch/pen events; devicePixelRatio: Crisp HiDPI rendering (capped at 2×) · react 18.3.1, react-router-dom 6.30.6, vite 5.4.21
Dependencies
react 18.3.1
Imported APIs
withControls — Wraps the demo in the shared control panel (presets, sliders, reset); hot-updates or remounts on change; paramsFromSpec — Turns the spec (colour/speed/size/count/extras) into control-panel parameter definitions; createCanvasStage — Shared Canvas 2D stage: canvas + info panel, HiDPI, one rAF loop, pointer state, idle auto-pointer; hueOf — Hue of a colour (0–360°); clamp — Clamps a value to a range; fmt — Number formatting (fixed decimals); F — Formula block HTML; S.clear — Clears with the background colour (translucent = trails); S.onFrame — Registers a per-frame callback; its return value feeds the info panel; ctx.fill() — Fills the current path; ctx.stroke() — Strokes the current path; ctx.fillText() — Draws filled text; ctx.beginPath() — Starts a new path; ctx.moveTo() — Moves the pen without drawing; ctx.arcTo() — Adds an arc using tangent lines; ctx.closePath() — Closes the current sub-path; ctx.measureText() — Measures text width
Source code
frontend/src/demos/kits/kit-layout.js: FAM.bento (L425-L466), TITLES['bento'] (L648-L648)
Code walkthrough
L427-427: Control definitions (colour/speed/size/count/extras): Emphasis color, Gap, Density step, Rounded, Show labels. L428-428: Preset buttons: name → parameter overrides (6). L429-437: Info-panel content: live rows(v), formula, notes, params, steps. L438-465: Init function: sets up state and returns the per-frame callback: draws with Canvas 2D `fill`, `stroke`; math via `Math.round`, `Math.sin`, `Math.min`; returns readouts `gap`, `n`, `cell`, `span`, `den` to the info panel. L648-648: This demo's entry in the `TITLES` table (title).
Principles
display:grid; grid-template-columns: repeat(4,1fr) Large: grid-column: span 2; grid-row: span 2 Bento = Pawnbox layout of different sizes Bento The layout uses the same set of grids that allow certain cards to cross multiple rows to form a masterly collage, which is common on the front page of the product and on the dashboard.