Citations

React Native

Tap a number and its source springs up.

Install

Source on GitHub

It works in Expo and in bare React Native. New to beUI Native? Set up your app first.

$ bunx beui-native add

Copies the component and the shared files it needs into src/, adds the theme tokens if they're missing, and installs its libraries. Files you've changed are kept.

Keep the folder layout, since the component imports the shared files by relative path.

1Install the libraries

npx expo install react-native-reanimated react-native-svg react-native-worklets
npm install uniwind tailwindcss

2Add the theme tokens

Once per app. Import it from the CSS file Uniwind reads, after Tailwind and Uniwind, and change the values to match your brand.

CSSsrc/styles/theme.css

/* Matches the default beUI palette in ui-components/lib/themes.ts.
   Native surface maps to card; muted maps to muted-foreground. */
@layer theme {
  :root {
    @variant light {
      --color-background: oklch(99% 0 0);
      --color-surface: oklch(97% 0 0);
      --color-foreground: oklch(15% 0 0);
      --color-muted: oklch(50% 0 0);
      --color-border: oklch(15% 0 0 / 0.06);
      --color-border-strong: oklch(15% 0 0 / 0.16);
      --color-primary: #0285f7;
      --color-on-primary: #ffffff;
      --color-destructive: #dc2626;
      --color-success: #059669;
      --color-warning: #d97706;
    }
  }

  :root {
    @variant dark {
      --color-background: #151515;
      --color-surface: #1c1c1c;
      --color-foreground: oklch(96% 0 0);
      --color-muted: oklch(62% 0 0);
      --color-border: rgb(255 255 255 / 0.05);
      --color-border-strong: rgb(255 255 255 / 0.14);
      --color-primary: #0285f7;
      --color-on-primary: #ffffff;
      --color-destructive: #f87171;
      --color-success: #34d399;
      --color-warning: #fbbf24;
    }
  }

  /* Tailwind's default monospace stack isn't a font React Native can load. */
  :root {
    @variant ios {
      --font-mono: Menlo;
    }
  }

  :root {
    @variant android {
      --font-mono: monospace;
    }
  }
}

3Copy the shared files

TSsrc/hooks/use-reduced-motion.ts

import { useEffect, useState } from "react";
import { AccessibilityInfo } from "react-native";
import { useReducedMotion } from "react-native-reanimated";

/** Reanimated supplies a synchronous initial value; native events keep it current. */
export function useReducedMotionPreference() {
  const initialValue = useReducedMotion();
  const [reducedMotion, setReducedMotion] = useState(initialValue);

  useEffect(() => {
    let active = true;
    let receivedEvent = false;
    const subscription = AccessibilityInfo.addEventListener(
      "reduceMotionChanged",
      (value) => {
        receivedEvent = true;
        setReducedMotion(value);
      },
    );
    void AccessibilityInfo.isReduceMotionEnabled().then((value) => {
      if (active && !receivedEvent) setReducedMotion(value);
    });
    return () => {
      active = false;
      subscription.remove();
    };
  }, []);

  return reducedMotion;
}

TSXsrc/primitives/agent-icons.tsx

import type { ReactNode } from "react";
import type { ColorValue } from "react-native";
import Svg, { Circle, Path, Rect } from "react-native-svg";

type GlyphProps = { size?: number; color?: ColorValue; strokeWidth?: number };

function Glyph({
  size = 16,
  color = "currentColor",
  strokeWidth = 2,
  children,
}: GlyphProps & { children: ReactNode }) {
  return (
    <Svg
      width={size}
      height={size}
      viewBox="0 0 24 24"
      fill="none"
      stroke={color}
      strokeWidth={strokeWidth}
      strokeLinecap="round"
      strokeLinejoin="round"
    >
      {children}
    </Svg>
  );
}

// Simple 24-unit stroke glyphs shared by the agent components.

export function ChevronDownGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M6 9l6 6 6-6" />
    </Glyph>
  );
}

export function ArrowUpGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M12 19V5M5.5 11.5L12 5l6.5 6.5" />
    </Glyph>
  );
}

export function PlusGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M12 5v14M5 12h14" />
    </Glyph>
  );
}

export function StopGlyph({ size = 12, color }: GlyphProps) {
  return (
    <Svg width={size} height={size} viewBox="0 0 12 12">
      <Rect x={1} y={1} width={10} height={10} rx={2.5} fill={color} />
    </Svg>
  );
}

export function CheckGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M5 12.5l4.5 4.5L19 7" />
    </Glyph>
  );
}

export function CopyGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Rect x={8.5} y={8.5} width={12} height={12} rx={2.5} />
      <Path d="M15.5 5.5v-.5A2 2 0 0 0 13.5 3h-8.5A2 2 0 0 0 3 5v8.5a2 2 0 0 0 2 2h.5" />
    </Glyph>
  );
}

export function RetryGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M3.5 12a8.5 8.5 0 1 0 2.6-6.1L3.5 8.5" />
      <Path d="M3.5 3.5v5h5" />
    </Glyph>
  );
}

export function ThumbGlyph({
  down = false,
  ...props
}: GlyphProps & { down?: boolean }) {
  return (
    <Glyph {...props}>
      <Path
        d="M7.5 10.5v10M7.5 10.5L11 3.5a2.5 2.5 0 0 1 2.5 2.5v3.5h5a2 2 0 0 1 2 2.3l-1.2 7A2 2 0 0 1 17.3 20.5H4.5a1 1 0 0 1-1-1v-8a1 1 0 0 1 1-1z"
        transform={down ? "rotate(180 12 12)" : undefined}
      />
    </Glyph>
  );
}

export function SearchGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Circle cx={11} cy={11} r={6.5} />
      <Path d="M16 16l4 4" />
    </Glyph>
  );
}

export function GlobeGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Circle cx={12} cy={12} r={8.5} />
      <Path d="M3.5 12h17M12 3.5c2.4 2.5 3.5 5.3 3.5 8.5s-1.1 6-3.5 8.5c-2.4-2.5-3.5-5.3-3.5-8.5s1.1-6 3.5-8.5z" />
    </Glyph>
  );
}

export function FileGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M14 3.5H7.5a2 2 0 0 0-2 2v13a2 2 0 0 0 2 2h9a2 2 0 0 0 2-2V8z" />
      <Path d="M14 3.5V8h4.5M9 13h6M9 16.5h4" />
    </Glyph>
  );
}

export function PencilGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M4 20h4L19 9a2.1 2.1 0 0 0-4-4L4 16z" />
      <Path d="M13.5 6.5l4 4M14 20h6" />
    </Glyph>
  );
}

export function TerminalGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Rect x={3.5} y={4.5} width={17} height={15} rx={2.5} />
      <Path d="M7.5 10l2.5 2-2.5 2M12.5 15h4" />
    </Glyph>
  );
}

export function WrenchGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M14.5 6.5a4 4 0 0 0 5 5l-8.8 8.8a2.1 2.1 0 0 1-3-3l8.8-8.8a4 4 0 0 1-2-2z" />
    </Glyph>
  );
}

export function SparkleGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M12 4l1.8 4.6L18.5 10.5l-4.7 1.9L12 17l-1.8-4.6-4.7-1.9 4.7-1.9z" />
      <Path d="M18.5 16.5v3M17 18h3" />
    </Glyph>
  );
}

export function MessageGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M20 14.5a2 2 0 0 1-2 2H8.5L4 20V6a2 2 0 0 1 2-2h12a2 2 0 0 1 2 2z" />
    </Glyph>
  );
}

export function ImageGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Rect x={3.5} y={4.5} width={17} height={15} rx={2.5} />
      <Circle cx={9} cy={10} r={1.5} />
      <Path d="M20.5 15.5l-4.5-4.5-9 8.5" />
    </Glyph>
  );
}

export function ShieldGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M12 3.5l7 2.5v5.5c0 4.4-3 7.7-7 9-4-1.3-7-4.6-7-9V6z" />
      <Path d="M9 12l2 2 4-4" />
    </Glyph>
  );
}

export function AlertGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Circle cx={12} cy={12} r={8.5} />
      <Path d="M12 8v4.5M12 16h.01" />
    </Glyph>
  );
}

export function CrossGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M6.5 6.5l11 11M17.5 6.5l-11 11" />
    </Glyph>
  );
}

export function HelpGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Circle cx={12} cy={12} r={8.5} />
      <Path d="M9.6 9.5a2.5 2.5 0 0 1 4.8 1c0 1.7-2.4 2.2-2.4 3.5M12 16.8h.01" />
    </Glyph>
  );
}

export function ArrowGlyph({
  back = false,
  ...props
}: GlyphProps & { back?: boolean }) {
  return (
    <Glyph {...props}>
      <Path
        d="M5 12h14M13 6l6 6-6 6"
        transform={back ? "rotate(180 12 12)" : undefined}
      />
    </Glyph>
  );
}

export function BracesGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M8.5 4H8a2 2 0 0 0-2 2v3.5A2.5 2.5 0 0 1 3.5 12 2.5 2.5 0 0 1 6 14.5V18a2 2 0 0 0 2 2h.5M15.5 4h.5a2 2 0 0 1 2 2v3.5a2.5 2.5 0 0 0 2.5 2.5 2.5 2.5 0 0 0-2.5 2.5V18a2 2 0 0 1-2 2h-.5" />
    </Glyph>
  );
}

export function BanGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Circle cx={12} cy={12} r={8.5} />
      <Path d="M6 6l12 12" />
    </Glyph>
  );
}

export function CircleCheckGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Circle cx={12} cy={12} r={8.5} />
      <Path d="M8.5 12.2l2.4 2.4 4.6-4.8" />
    </Glyph>
  );
}

export function CircleCrossGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Circle cx={12} cy={12} r={8.5} />
      <Path d="M9.5 9.5l5 5M14.5 9.5l-5 5" />
    </Glyph>
  );
}

export function ListGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M4 6.5l1.5 1.5L8 5.5M4 13l1.5 1.5L8 12M11.5 7h8.5M11.5 13.5h8.5M11.5 19h8.5M4.5 19h2" />
    </Glyph>
  );
}

/** An open ring, spun by SpinGlyph. */
export function RingGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M20.5 12a8.5 8.5 0 1 1-6-8.1" />
    </Glyph>
  );
}

export function ReplyGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M9.5 7L4.5 12l5 5M4.5 12h10a5 5 0 0 1 5 5v1" />
    </Glyph>
  );
}

export function WrapGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M4 6.5h16M4 12h12.5a3.25 3.25 0 0 1 0 6.5H12M4 18.5h4.5M14 16.5l-2 2 2 2" />
    </Glyph>
  );
}

export function BookGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M12 6.5c-1.6-1.3-4-2-7.5-2v13c3.5 0 5.9.7 7.5 2 1.6-1.3 4-2 7.5-2v-13c-3.5 0-5.9.7-7.5 2zM12 6.5v13" />
    </Glyph>
  );
}

export function ExternalGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M14 4.5h5.5V10M19.5 4.5L11 13M17 14v4a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V9a2 2 0 0 1 2-2h4" />
    </Glyph>
  );
}

export function DoubleCheckGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Path d="M2.5 12.5l4.5 4.5 9-9.5M12 16.5l.5.5 9-9.5" />
    </Glyph>
  );
}

export function ClockGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Circle cx={12} cy={12} r={8.5} />
      <Path d="M12 7.5V12l3 2" />
    </Glyph>
  );
}

export function MicGlyph(props: GlyphProps) {
  return (
    <Glyph {...props}>
      <Rect x={9} y={3.5} width={6} height={11} rx={3} />
      <Path d="M5.5 11a6.5 6.5 0 0 0 13 0M12 17.5v3" />
    </Glyph>
  );
}

TSXsrc/primitives/disclosure.tsx

import { type ReactNode, useEffect, useRef } from "react";
import { StyleSheet, View, type ViewStyle } from "react-native";
import Animated, {
  measure,
  useAnimatedRef,
  useAnimatedStyle,
  useSharedValue,
  withTiming,
} from "react-native-reanimated";
import { scheduleOnUI } from "react-native-worklets";
import { EASE_OUT } from "../styles/motion";

const OPEN = { duration: 220, easing: EASE_OUT };
const CLOSE = { duration: 140, easing: EASE_OUT };
const DROP = 4;
// The height while settled open: unconstrained, so growing content just flows.
const NATURAL = -1;

export type DisclosureProps = {
  open: boolean;
  /** Snaps open and closed, keeping only the fade. */
  reduce: boolean;
  /** Caps the open height; content clips beyond it. */
  maxHeight?: number;
  style?: ViewStyle;
  children: ReactNode;
};

/**
 * Collapsible content shared by the agent components: the height eases
 * between closed and the content's size while the content fades and drops 4
 * points into place. Settled open, the height is left alone, so content that
 * grows (streamed rows, new sources) is never clipped. Closed content is
 * hidden from screen readers and touches.
 */
export function Disclosure({
  open,
  reduce,
  maxHeight,
  style,
  children,
}: DisclosureProps) {
  // The content's height, kept current by layout events; measuring on demand
  // can read 0 for content inside a scroll view.
  const contentHeight = useSharedValue(0);
  const clipRef = useAnimatedRef<Animated.View>();
  const height = useSharedValue(open ? NATURAL : 0);
  const shown = useSharedValue(open ? 1 : 0);
  const mounted = useRef(false);

  useEffect(() => {
    // The first render is already in place.
    if (!mounted.current) {
      mounted.current = true;
      return;
    }
    const cap = maxHeight ?? Number.POSITIVE_INFINITY;
    scheduleOnUI(() => {
      "worklet";
      // Real sizes, read on the UI thread at the moment of the change.
      const full = Math.min(contentHeight.value, cap);
      if (open) {
        const from = height.value === NATURAL ? full : height.value;
        if (reduce) {
          height.value = NATURAL;
        } else {
          height.value = from;
          height.value = withTiming(full, OPEN, (done) => {
            if (done) height.value = NATURAL;
          });
        }
      } else {
        const clip = measure(clipRef);
        const from =
          height.value === NATURAL ? (clip?.height ?? full) : height.value;
        height.value = from;
        height.value = reduce ? 0 : withTiming(0, CLOSE);
      }
    });
    shown.value = withTiming(
      open ? 1 : 0,
      reduce ? { duration: 0 } : open ? OPEN : CLOSE,
    );
  }, [clipRef, contentHeight, height, maxHeight, open, reduce, shown]);

  const clipStyle = useAnimatedStyle(() =>
    // Settled open, the clip follows the content's measured height.
    height.value === NATURAL
      ? {
          height: Math.min(
            contentHeight.value,
            maxHeight ?? Number.POSITIVE_INFINITY,
          ),
        }
      : { height: height.value },
  );
  const contentStyle = useAnimatedStyle(
    () => ({
      opacity: shown.value,
      transform: [{ translateY: reduce ? 0 : (1 - shown.value) * -DROP }],
    }),
    [reduce],
  );

  return (
    <Animated.View
      ref={clipRef}
      pointerEvents={open ? "auto" : "none"}
      accessibilityElementsHidden={!open}
      importantForAccessibility={open ? "auto" : "no-hide-descendants"}
      style={[styles.clip, clipStyle, style]}
    >
      {/* Absolutely placed, so the content keeps its natural height while the
          clip around it is short, and can be measured at any time. */}
      <Animated.View style={[styles.content, contentStyle]}>
        <View
          style={styles.measure}
          onLayout={({ nativeEvent }) => {
            contentHeight.value = nativeEvent.layout.height;
          }}
        >
          {children}
        </View>
      </Animated.View>
    </Animated.View>
  );
}

const styles = StyleSheet.create({
  clip: { overflow: "hidden" },
  content: { position: "absolute", left: 0, right: 0, top: 0 },
  measure: { flexShrink: 0 },
});

TSXsrc/primitives/rise-in.tsx

import { type ReactNode, useEffect } from "react";
import type { ViewProps } from "react-native";
import Animated, {
  LinearTransition,
  useAnimatedStyle,
  useSharedValue,
  withSpring,
  withTiming,
} from "react-native-reanimated";
import { EASE_OUT, SPRING_LAYOUT } from "../styles/motion";

const FADE = { duration: 180, easing: EASE_OUT };
const RISE = 6;
const EXIT_DURATION = 140;

/** Leaving rows reverse their entrance: fade and lift 3 points away. */
function riseOut() {
  "worklet";
  return {
    initialValues: { opacity: 1, transform: [{ translateY: 0 }] },
    animations: {
      opacity: withTiming(0, { duration: EXIT_DURATION, easing: EASE_OUT }),
      transform: [
        {
          translateY: withTiming(-3, {
            duration: EXIT_DURATION,
            easing: EASE_OUT,
          }),
        },
      ],
    },
  };
}

const GLIDE = LinearTransition.springify()
  .stiffness(SPRING_LAYOUT.stiffness)
  .damping(SPRING_LAYOUT.damping)
  .mass(SPRING_LAYOUT.mass);

/**
 * A row that fades and rises 6 points into place when it mounts, and lifts
 * away as it leaves, while its neighbours glide to make room. Shared by the agent activity lists.
 */
export function RiseIn({
  reduce,
  appear = true,
  children,
  style,
  ...props
}: ViewProps & { reduce: boolean; appear?: boolean; children: ReactNode }) {
  const animate = appear && !reduce;
  const opacity = useSharedValue(animate ? 0 : 1);
  const lift = useSharedValue(animate ? RISE : 0);

  // Plays once, on mount.
  useEffect(() => {
    if (!animate) return;
    opacity.value = withTiming(1, FADE);
    lift.value = withSpring(0, SPRING_LAYOUT);
  }, []);

  const rise = useAnimatedStyle(() => ({
    opacity: opacity.value,
    transform: [{ translateY: lift.value }],
  }));

  return (
    <Animated.View
      layout={reduce ? undefined : GLIDE}
      exiting={reduce ? undefined : riseOut}
      style={[rise, style]}
      {...props}
    >
      {children}
    </Animated.View>
  );
}

TSsrc/styles/motion.ts

import { Easing, ReduceMotion } from "react-native-reanimated";

// Mirrors beUI's lib/ease.ts so native motion matches the web library.

export const EASE_OUT = Easing.bezier(0.16, 1, 0.3, 1);
export const EASE_IN_OUT = Easing.bezier(0.77, 0, 0.175, 1);

/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
  stiffness: 500,
  damping: 30,
  mass: 0.6,
  reduceMotion: ReduceMotion.System,
} as const;

/** Content swaps: label and icon slots trading places inside a control. */
export const SPRING_SWAP = {
  stiffness: 460,
  damping: 30,
  mass: 0.55,
  reduceMotion: ReduceMotion.System,
} as const;

/** Shared-layout glides: pills, indicators and panels moving between positions. */
export const SPRING_LAYOUT = {
  stiffness: 360,
  damping: 32,
  mass: 0.6,
  reduceMotion: ReduceMotion.System,
} as const;

/** Dragged handles and fills; critically damped so values never rebound off an end. */
export const SPRING_GLIDE = {
  stiffness: 700,
  damping: 50,
  mass: 0.5,
  reduceMotion: ReduceMotion.System,
} as const;

export const motion = {
  press: SPRING_PRESS,
  swap: SPRING_SWAP,
  layout: SPRING_LAYOUT,
  glide: SPRING_GLIDE,
  exit: { duration: 160, easing: EASE_OUT, reduceMotion: ReduceMotion.System },
  fade: { duration: 150, reduceMotion: ReduceMotion.System },
} as const;

4Copy the component

TSXsrc/components/citations/citations.tsx

import { type ReactNode, useEffect, useRef, useState } from "react";
import {
  Image,
  Linking,
  Modal,
  Pressable,
  StyleSheet,
  Text,
  useWindowDimensions,
  View,
  type ViewProps,
} from "react-native";
import Animated, {
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,
  withSpring,
  withTiming,
} from "react-native-reanimated";
import { scheduleOnRN } from "react-native-worklets";
import { useResolveClassNames } from "uniwind";
import { useReducedMotionPreference } from "../../hooks/use-reduced-motion";
import {
  BookGlyph,
  ChevronDownGlyph,
  ExternalGlyph,
  GlobeGlyph,
} from "../../primitives/agent-icons";
import { Disclosure } from "../../primitives/disclosure";
import { RiseIn } from "../../primitives/rise-in";
import { EASE_OUT, SPRING_SWAP } from "../../styles/motion";

export type CitationItem = {
  id: string;
  title: string;
  domain?: string;
  /** Opens on tap, and supplies the favicon. */
  url?: string;
  /** Replaces the favicon, such as a document icon for files. */
  icon?: ReactNode;
};

const SPRING_POP = {
  stiffness: 420,
  damping: 32,
  mass: 0.6,
  reduceMotion: ReduceMotion.System,
};
const CARD_EXIT = { duration: 140, easing: EASE_OUT };
const CARD_WIDTH = 288;
const EDGE = 16;
const GAP = 8;

function faviconFor(url?: string) {
  if (!url) return null;
  try {
    return new URL("/favicon.ico", url).toString();
  } catch {
    return null;
  }
}

export type CitationFaviconProps = {
  url?: string;
  icon?: ReactNode;
  size?: number;
};

/** A source's favicon, its custom icon, or a globe when neither loads. */
export function CitationFavicon({
  url,
  icon,
  size = 16,
}: CitationFaviconProps) {
  const [failed, setFailed] = useState<string | null>(null);
  const { color: muted } = useResolveClassNames("text-muted");
  const src = faviconFor(url);
  return (
    <View
      accessibilityElementsHidden
      importantForAccessibility="no-hide-descendants"
      style={[styles.favicon, { width: size + 4, height: size + 4 }]}
    >
      {icon ? (
        icon
      ) : src && src !== failed ? (
        <Image
          source={{ uri: src }}
          onError={() => setFailed(src)}
          style={{ width: size, height: size, borderRadius: 3 }}
        />
      ) : (
        <GlobeGlyph size={size - 2} color={muted} />
      )}
    </View>
  );
}

export type CitationStackProps = { citations: CitationItem[]; limit?: number };

/** Up to `limit` (3) overlapping favicons, as a compact hint of the sources. */
export function CitationStack({ citations, limit = 3 }: CitationStackProps) {
  return (
    <View
      accessibilityElementsHidden
      importantForAccessibility="no-hide-descendants"
      style={styles.stack}
    >
      {citations.slice(0, limit).map((item, index) => (
        <View
          key={item.id}
          style={[styles.stackItem, index > 0 && styles.overlap]}
          className="border-2 border-background bg-background"
        >
          <CitationFavicon url={item.url} icon={item.icon} size={14} />
        </View>
      ))}
    </View>
  );
}

function open(item: CitationItem, onOpenSource?: (item: CitationItem) => void) {
  if (onOpenSource) onOpenSource(item);
  else if (item.url) void Linking.openURL(item.url);
}

type Anchor = { x: number; y: number; width: number; height: number };

/** The card a tapped marker springs up into. */
function SourceCard({
  item,
  index,
  anchor,
  visible,
  reduce,
  onOpenSource,
  onClose,
}: {
  item: CitationItem;
  index: number;
  anchor: Anchor | null;
  visible: boolean;
  reduce: boolean;
  onOpenSource?: (item: CitationItem) => void;
  onClose: () => void;
}) {
  const window = useWindowDimensions();
  const [present, setPresent] = useState(visible);
  const [height, setHeight] = useState(0);
  const progress = useSharedValue(0);
  if (visible && !present) setPresent(true);
  const hide = () => setPresent(false);

  useEffect(() => {
    if (!present) return;
    if (visible)
      progress.value = reduce
        ? withTiming(1, { duration: 120 })
        : withSpring(1, SPRING_POP);
    else
      progress.value = withTiming(
        0,
        reduce ? { duration: 120 } : CARD_EXIT,
        (done) => {
          if (done) scheduleOnRN(hide);
        },
      );
  }, [present, progress, reduce, visible]);

  const style = useAnimatedStyle(() => {
    const p = progress.value;
    return {
      opacity: Math.min(1, p * 1.5),
      transform: reduce ? [] : [{ scale: 0.6 + p * 0.4 }],
    };
  }, [reduce]);

  if (!present || !anchor) return null;
  const width = Math.min(CARD_WIDTH, window.width - EDGE * 2);
  const left = Math.max(
    EDGE,
    Math.min(
      anchor.x + anchor.width / 2 - width / 2,
      window.width - width - EDGE,
    ),
  );
  // Above the marker when there's room, otherwise below it.
  const above = anchor.y - GAP - height > EDGE + 40;
  const top = above ? anchor.y - GAP - height : anchor.y + anchor.height + GAP;
  const originX = anchor.x + anchor.width / 2 - left;

  return (
    <Modal
      transparent
      visible
      animationType="none"
      statusBarTranslucent
      navigationBarTranslucent
      onRequestClose={onClose}
    >
      <Pressable
        accessibilityLabel="Close source"
        style={StyleSheet.absoluteFill}
        onPress={onClose}
      />
      <Animated.View
        accessibilityViewIsModal
        onLayout={({ nativeEvent }) => setHeight(nativeEvent.layout.height)}
        style={[
          styles.card,
          {
            left,
            top,
            width,
            transformOrigin: [originX, above ? "100%" : "0%", 0],
          },
          style,
        ]}
        className="gap-3 rounded-2xl border border-border bg-background p-3"
      >
        <View style={styles.cardRow}>
          <CitationFavicon url={item.url} icon={item.icon} size={20} />
          <View style={styles.flex}>
            <Text
              numberOfLines={2}
              className="text-sm font-medium text-foreground"
            >
              {item.title}
            </Text>
            {item.domain ? (
              <Text numberOfLines={1} className="text-xs text-muted">
                {item.domain}
              </Text>
            ) : null}
          </View>
          <Text
            className="text-[10px] font-semibold text-muted"
            style={styles.tabular}
          >
            {index}
          </Text>
        </View>
        {item.url || onOpenSource ? (
          <Pressable
            accessibilityRole="link"
            onPress={() => {
              onClose();
              open(item, onOpenSource);
            }}
            style={styles.openButton}
            className="rounded-xl bg-primary active:opacity-80"
          >
            <Text className="text-sm font-medium text-on-primary">
              Open source
            </Text>
          </Pressable>
        ) : null}
      </Animated.View>
    </Modal>
  );
}

export type CitationProps = {
  item: CitationItem;
  /** The number shown, usually the source's position starting at 1. */
  index: number;
  /** Replaces opening the URL. */
  onOpenSource?: (item: CitationItem) => void;
  /** Defaults to "Citation {index}: {title}". */
  label?: string;
  disableAnimation?: boolean;
};

/**
 * An inline citation number. Tapping it springs a card up out of the marker
 * with the source and a button to open it, so you never lose your place.
 */
export function Citation({
  item,
  index,
  onOpenSource,
  label,
  disableAnimation = false,
}: CitationProps) {
  const reducedMotion = useReducedMotionPreference();
  const reduce = reducedMotion || disableAnimation;
  const ref = useRef<View>(null);
  const [anchor, setAnchor] = useState<Anchor | null>(null);
  const [visible, setVisible] = useState(false);

  return (
    // One inline view: the card's modal lives inside the marker so it adds
    // nothing to the line of text around it.
    <Pressable
      ref={ref}
      accessibilityRole="button"
      accessibilityLabel={label ?? `Citation ${index}: ${item.title}`}
      hitSlop={10}
      onPress={() =>
        ref.current?.measureInWindow((x, y, width, height) => {
          setAnchor({ x, y, width, height });
          setVisible(true);
        })
      }
      style={styles.marker}
      className="rounded-md bg-surface active:bg-border-strong"
    >
      <Text
        className="text-[10px] font-semibold text-muted"
        style={styles.tabular}
      >
        {index}
      </Text>
      <SourceCard
        item={item}
        index={index}
        anchor={anchor}
        visible={visible}
        reduce={reduce}
        onOpenSource={onOpenSource}
        onClose={() => setVisible(false)}
      />
    </Pressable>
  );
}

function CitationRow({
  item,
  index,
  reduce,
  onOpenSource,
}: {
  item: CitationItem;
  index: number;
  reduce: boolean;
  onOpenSource?: (item: CitationItem) => void;
}) {
  const { color: muted } = useResolveClassNames("text-muted");
  const tappable = Boolean(item.url || onOpenSource);
  return (
    <RiseIn reduce={reduce}>
      <Pressable
        accessibilityRole={tappable ? "link" : undefined}
        accessibilityLabel={`${index}. ${item.title}${item.domain ? `, ${item.domain}` : ""}`}
        disabled={!tappable}
        onPress={() => open(item, onOpenSource)}
        style={styles.row}
        className="rounded-lg px-1.5 py-1.5 active:bg-surface"
      >
        <CitationFavicon url={item.url} icon={item.icon} />
        <View style={styles.flex}>
          <Text
            numberOfLines={1}
            className="text-sm font-medium text-foreground/80"
          >
            {item.title}
          </Text>
          {item.domain ? (
            <Text numberOfLines={1} className="text-xs text-muted/70">
              {item.domain}
            </Text>
          ) : null}
        </View>
        <View style={styles.badge} className="rounded-md bg-foreground/5">
          <Text
            className="text-[10px] font-semibold text-muted"
            style={styles.tabular}
          >
            {index}
          </Text>
        </View>
        {tappable ? <ExternalGlyph size={14} color={muted} /> : null}
      </Pressable>
    </RiseIn>
  );
}

export type CitationListProps = {
  citations: CitationItem[];
  onOpenSource?: (item: CitationItem) => void;
  disableAnimation?: boolean;
};

/** The sources as rows that rise in as they arrive. Tap one to open it. */
export function CitationList({
  citations,
  onOpenSource,
  disableAnimation = false,
}: CitationListProps) {
  const reducedMotion = useReducedMotionPreference();
  const reduce = reducedMotion || disableAnimation;
  return (
    <View className="gap-0.5">
      {citations.map((item, index) => (
        <CitationRow
          key={item.id}
          item={item}
          index={index + 1}
          reduce={reduce}
          onOpenSource={onOpenSource}
        />
      ))}
    </View>
  );
}

export type CitationsProps = Omit<ViewProps, "children"> & {
  citations: CitationItem[];
  /** Defaults to "Sources". */
  title?: string;
  open?: boolean;
  /** Defaults to false. */
  defaultOpen?: boolean;
  onOpenChange?: (open: boolean) => void;
  onOpenSource?: (item: CitationItem) => void;
  className?: string;
  disableAnimation?: boolean;
};

/** A "Sources" toggle with a count that folds open into the source list. */
export function Citations({
  citations,
  title = "Sources",
  open: controlledOpen,
  defaultOpen = false,
  onOpenChange,
  onOpenSource,
  className = "",
  disableAnimation = false,
  ...props
}: CitationsProps) {
  const reducedMotion = useReducedMotionPreference();
  const reduce = reducedMotion || disableAnimation;
  const [internalOpen, setInternalOpen] = useState(defaultOpen);
  const isOpen = controlledOpen ?? internalOpen;
  const turn = useSharedValue(isOpen ? 1 : 0);
  const { color: muted } = useResolveClassNames("text-muted");

  useEffect(() => {
    turn.value = reduce
      ? isOpen
        ? 1
        : 0
      : withSpring(isOpen ? 1 : 0, SPRING_SWAP);
  }, [isOpen, reduce, turn]);
  const chevronStyle = useAnimatedStyle(() => ({
    transform: [{ rotate: `${turn.value * 180}deg` }],
  }));

  const toggle = () => {
    if (controlledOpen === undefined) setInternalOpen(!isOpen);
    onOpenChange?.(!isOpen);
  };

  return (
    <View className={`w-full ${className}`} {...props}>
      <Pressable
        accessibilityRole="button"
        accessibilityState={{ expanded: isOpen }}
        accessibilityLabel={`${title}, ${citations.length}`}
        onPress={toggle}
        hitSlop={6}
        style={styles.trigger}
      >
        <BookGlyph size={16} color={muted} />
        <Text className="text-sm font-medium text-muted">{title}</Text>
        <View className="rounded-full bg-surface px-1.5 py-0.5">
          <Text
            className="text-[10px] font-semibold text-muted"
            style={styles.tabular}
          >
            {citations.length}
          </Text>
        </View>
        <Animated.View style={chevronStyle}>
          <ChevronDownGlyph size={14} color={muted} />
        </Animated.View>
      </Pressable>
      <Disclosure open={isOpen} reduce={reduce}>
        <View className="mt-1">
          <CitationList
            citations={citations}
            onOpenSource={onOpenSource}
            disableAnimation={disableAnimation}
          />
        </View>
      </Disclosure>
    </View>
  );
}

const styles = StyleSheet.create({
  flex: { flex: 1, minWidth: 0 },
  favicon: { alignItems: "center", justifyContent: "center" },
  stack: { flexDirection: "row" },
  stackItem: {
    width: 24,
    height: 24,
    borderRadius: 12,
    alignItems: "center",
    justifyContent: "center",
    overflow: "hidden",
  },
  overlap: { marginLeft: -6 },
  marker: {
    minWidth: 18,
    height: 18,
    paddingHorizontal: 4,
    alignItems: "center",
    justifyContent: "center",
    transform: [{ translateY: -2 }],
  },
  card: {
    position: "absolute",
    shadowColor: "#000",
    shadowOpacity: 0.12,
    shadowRadius: 24,
    shadowOffset: { width: 0, height: 10 },
    elevation: 8,
  },
  cardRow: { flexDirection: "row", alignItems: "flex-start", gap: 10 },
  openButton: { minHeight: 40, alignItems: "center", justifyContent: "center" },
  row: { flexDirection: "row", alignItems: "center", gap: 8, minHeight: 44 },
  badge: {
    width: 20,
    height: 20,
    alignItems: "center",
    justifyContent: "center",
  },
  trigger: {
    flexDirection: "row",
    alignItems: "center",
    gap: 8,
    minHeight: 36,
    alignSelf: "flex-start",
  },
  tabular: { fontVariant: ["tabular-nums"] },
});

TSsrc/components/citations/index.ts

export type {
  CitationFaviconProps,
  CitationItem,
  CitationListProps,
  CitationProps,
  CitationStackProps,
  CitationsProps,
} from "./citations";
export {
  Citation,
  CitationFavicon,
  CitationList,
  CitationStack,
  Citations,
} from "./citations";

Documentation

Native port of beUI Citations: sources behind an agent's answer, inline and as a list.

import { Citation, Citations } from "./src";

<Text>
  Run gestures on the UI thread <Citation item={sources[0]} index={1} />.
</Text>
<Citations citations={sources} defaultOpen />

Parts

Citation is an inline number. Put it inside your text.
Citations is a "Sources" toggle with a count that folds open into the list. Sources rise in as you add them.
CitationList is the list on its own; CitationStack shows up to three overlapping favicons; CitationFavicon shows one.
A source has a title, an optional domain and url, and an optional icon for things without a favicon, such as files.
Tapping a source with a url opens it with React Native's Linking. Pass onOpenSource to handle it yourself, such as in an in-app browser.

Favicons load from each site's /favicon.ico, the way the web version does, with no third-party service. A globe stands in when a site has none.

Better on a phone

On the web, a citation number jumps the page down to the source list. On a phone, tapping it springs a card up out of the number with the source's title, domain and an "Open source" button, so you never lose your place in the answer. The card sits above the number when there's room and below it otherwise, and tapping outside closes it.

Accessibility

Each number reads as "Citation 2: WAI accessibility patterns". Change it with label.
The toggle reports whether the list is expanded, and rows read as links.
Reduced motion, or disableAnimation, opens the card and the list with fades only.

Copy this directory, hooks/use-reduced-motion.ts, primitives/agent-icons.tsx, primitives/disclosure.tsx, primitives/rise-in.tsx, styles/motion.ts, and the semantic tokens in styles/theme.css. It uses react-native-svg for its icons.

Also on the web. The React version of Citations, built with Motion and Tailwind CSS.

Citations

Preview

Install

1Install the libraries

2Add the theme tokens

3Copy the shared files

4Copy the component

Documentation

Parts

Better on a phone

Accessibility

Related components

Message

Todo List

Streaming Response