ui/components/overflow

Overflow

Container-aware overflow handling for items (dynamic fitting with indicator) and text (line clamping with auto-tooltip when truncated).

Preview

tsx

1 "use client";2 3 import { Overflow } from "@/components/ui/overflow";4 5 const tags = ["React", "TypeScript", "Tailwind", "Node.js", "Vitest", "Zod", "Prisma"];6 7 // Each chip is passed as its own React child so Overflow measures them individually;8 // a child may be any element or component, as long as one child means one measured item.9 const CHIP_CLASS =10   "inline-flex items-center rounded-sm border border-foreground/30 px-2 py-0.5 font-mono text-xs text-foreground";11 12 export default function OverflowItemsExample() {13   return (14     <div className="flex flex-col gap-4">15       <div className="space-y-1.5">16         <span className="text-xs font-mono text-muted-foreground">17           default indicator — dashed badge shipped by the component18         </span>19         <div className="w-80 border border-dashed border-foreground/20 p-2">20           <Overflow mode="items" className="gap-1.5">21             {tags.map((tag) => (22               <span key={tag} className={CHIP_CLASS}>23                 {tag}24               </span>25             ))}26           </Overflow>27         </div>28       </div>29 30       <div className="space-y-1.5">31         <span className="text-xs font-mono text-muted-foreground">32           custom indicator — solid, tight radius, matches the chips33         </span>34         <div className="w-80 border border-dashed border-foreground/20 p-2">35           <Overflow36             mode="items"37             className="gap-1.5"38             indicator={({ count }) => (39               <span className="inline-flex items-center rounded-sm border border-foreground/30 bg-foreground/10 px-2 py-0.5 font-mono text-xs text-muted-foreground">40                 +{count} more41               </span>42             )}43           >44             {tags.map((tag) => (45               <span key={tag} className={CHIP_CLASS}>46                 {tag}47               </span>48             ))}49           </Overflow>50         </div>51       </div>52     </div>53   );54 }55

Installation

$pnpm exec dgadd add ui/overflow

[Installs to]src/components/ui/overflow[Item]ui/overflow

dgadd is not public on npm yet. Until the first release, pack @diffgazer/add from the repository and install that tarball into this app, which is what puts dgadd on pnpm exec.

UI components require Tailwind CSS v4. Local copy mode imports src/styles/styles.css; package mode uses @diffgazer/ui CSS once packages are available.

Usage

tsx

1 "use client";2 3 import { Overflow } from "@/components/ui/overflow";4 5 const tags = ["React", "TypeScript", "Tailwind", "Node.js", "Vitest", "Zod", "Prisma"];6 7 // Each chip is passed as its own React child so Overflow measures them individually;8 // a child may be any element or component, as long as one child means one measured item.9 const CHIP_CLASS =10   "inline-flex items-center rounded-sm border border-foreground/30 px-2 py-0.5 font-mono text-xs text-foreground";11 12 export default function OverflowItemsExample() {13   return (14     <div className="flex flex-col gap-4">15       <div className="space-y-1.5">16         <span className="text-xs font-mono text-muted-foreground">17           default indicator — dashed badge shipped by the component18         </span>19         <div className="w-80 border border-dashed border-foreground/20 p-2">20           <Overflow mode="items" className="gap-1.5">21             {tags.map((tag) => (22               <span key={tag} className={CHIP_CLASS}>23                 {tag}24               </span>25             ))}26           </Overflow>27         </div>28       </div>29 30       <div className="space-y-1.5">31         <span className="text-xs font-mono text-muted-foreground">32           custom indicator — solid, tight radius, matches the chips33         </span>34         <div className="w-80 border border-dashed border-foreground/20 p-2">35           <Overflow36             mode="items"37             className="gap-1.5"38             indicator={({ count }) => (39               <span className="inline-flex items-center rounded-sm border border-foreground/30 bg-foreground/10 px-2 py-0.5 font-mono text-xs text-muted-foreground">40                 +{count} more41               </span>42             )}43           >44             {tags.map((tag) => (45               <span key={tag} className={CHIP_CLASS}>46                 {tag}47               </span>48             ))}49           </Overflow>50         </div>51       </div>52     </div>53   );54 }55

Examples

Avatars

Preview

tsx

1 "use client";2 3 import { Avatar } from "@/components/ui/avatar";4 import { Overflow } from "@/components/ui/overflow";5 6 const users = [7   { initials: "FX", name: "Felix" },8   { initials: "AR", name: "Aria" },9   { initials: "DV", name: "Dev" },10   { initials: "KI", name: "Kai" },11   { initials: "NV", name: "Nova" },12   { initials: "ZR", name: "Zara" },13   { initials: "LN", name: "Luna" },14   { initials: "RX", name: "Rex" },15 ];16 17 // Custom count chip: solid border and tight radius, matching the avatar chips.18 // The dashed border is reserved for the component's own default indicator.19 const COUNT_CHIP_CLASS =20   "flex h-6 w-6 shrink-0 items-center justify-center rounded-sm border border-foreground/30 font-mono text-2xs text-muted-foreground";21 22 export default function OverflowAvatarsExample() {23   return (24     <div className="flex flex-col gap-4">25       <div className="space-y-1.5">26         <span className="text-xs font-mono text-muted-foreground">w-32</span>27         <div className="w-32 border border-dashed border-foreground/20 p-2">28           <Overflow29             mode="items"30             indicator={({ count }) => <span className={COUNT_CHIP_CLASS}>+{count}</span>}31           >32             {users.map((u) => (33               <Avatar key={u.initials} alt={u.name} fallback={u.initials} size="sm" />34             ))}35           </Overflow>36         </div>37       </div>38 39       <div className="space-y-1.5">40         <span className="text-xs font-mono text-muted-foreground">w-48</span>41         <div className="w-48 border border-dashed border-foreground/20 p-2">42           <Overflow43             mode="items"44             indicator={({ count }) => <span className={COUNT_CHIP_CLASS}>+{count}</span>}45           >46             {users.map((u) => (47               <Avatar key={u.initials} alt={u.name} fallback={u.initials} size="sm" />48             ))}49           </Overflow>50         </div>51       </div>52     </div>53   );54 }55

Text

Preview

tsx

1 import { Overflow } from "@/components/ui/overflow";2 3 export default function OverflowTextExample() {4   const longText =5     "This is a very long description that demonstrates how the Overflow component handles text truncation with automatic ellipsis and native browser tooltips on hover.";6 7   return (8     <div className="flex flex-col gap-4">9       <div className="space-y-1.5">10         <span className="text-xs font-mono text-muted-foreground">11           lines=1 (truncate) — hover the clipped line for the auto tooltip12         </span>13         <div className="w-64 border border-dashed border-foreground/20 p-2">14           <Overflow mode="text">{longText}</Overflow>15         </div>16       </div>17 18       <div className="space-y-1.5">19         <span className="text-xs font-mono text-muted-foreground">lines=2 (clamp)</span>20         <div className="w-64 border border-dashed border-foreground/20 p-2">21           <Overflow mode="text" lines={2}>22             {longText}23           </Overflow>24         </div>25       </div>26 27       <div className="space-y-1.5">28         <span className="text-xs font-mono text-muted-foreground">lines=3 (clamp)</span>29         <div className="w-64 border border-dashed border-foreground/20 p-2">30           <Overflow mode="text" lines={3}>31             {longText}32           </Overflow>33         </div>34       </div>35     </div>36   );37 }38

API Reference

Overflow

Name	Type	Default	Description
mode	"text" \| "items"	"text"	Selects fitting-items mode when set to items; text clamps string content with optional auto-tooltip, while items measures children and renders an overflow indicator for those that do not fit.
childrenrequired	string (text mode) \| ReactNode (items mode)	—	Items to fit into the available width; string to clamp (text mode) or items to measure (items mode).
lines	number	1	Text mode only. 1 truncates; 2+ uses CSS line-clamp.
tooltip	ReactNode \| boolean	—	Text mode only. true/ReactNode renders a Tooltip when content is actually clipped (auto-derived from children when true). false disables the tooltip.
indicator	ReactNode \| ((props: { count: number }) => ReactNode)	dashed ellipsis badge	Custom indicator shown for items that do not fit. Items mode only; render function or static node shown when items overflow.
getOverflowLabel	(count: number) => string	count => count + " more items"	Items mode only. Localizes the accessible name announced for the overflow indicator.
className	string	—	Merged onto the root. Items mode ships gap-1 between items and indicator; override it here (for example gap-1.5).

Accessibility

Notes

Two Modes

Text mode is the default: CSS truncation with useOverflowDetection hook detecting actual overflow + Tooltip that only appears when content is truly clipped. Items mode requires mode="items" and measures children against container width via ResizeObserver, showing what fits plus an overflow indicator.

Items Mode

Uses a hidden measurement row to calculate widths before paint (no flicker). Default indicator is an ellipsis badge. Customize via the indicator prop — pass a render function ({ count }) => ReactNode or static ReactNode.

Indicator Convention

The built-in indicator is a dashed badge: dashed means 'the library put this here'. Custom indicators are solid so a consumer-authored count reads as content. Keep custom indicators on the tight radius (rounded-sm or none) so they match neighbouring chips.

Text Mode

Set lines={1} for single-line truncate or lines={2+} for multi-line clamping. Tooltip auto-derives content from string children. Set tooltip={false} to disable, or tooltip={<custom>} for custom content.

useOverflowDetection Hook

The overflow detection logic is available as a standalone hook (overflow-detection registry item). Use it independently for custom overflow UIs.

Source

Install via CLI: pnpm exec dgadd add ui/overflow. Keyboard hooks are included as standalone copies. For the full experience, use --integration keys.

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Overflow

Installation

Usage

Examples

Avatars

Text

API Reference

Overflow

Accessibility

Notes

Two Modes

Items Mode

Indicator Convention

Text Mode

useOverflowDetection Hook

Source

View component source (39 files)