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That only works when both // paths have the same commands in the same order with the same count of // numbers: otherwise numbers pair up with the wrong commands (a garbled // shape), or Motion finds no pairing at all and snaps to the new path. Every // pair below is written to that shared shape, with collapsed or duplicated // points standing in for geometry one state lacks. export type MorphShape = { off: string; on: string; // Degrees the whole glyph turns on the way to `on`. rotate?: number; filled?: boolean; }; export const SHAPES = { // The play triangle is cut into two quads at x=13 that each become a bar. // The triangle sits right of the box center, because its visual weight is // at its wide end. playPause: { off: "M7.5 5L13 8.5L13 15.5L7.5 19Z M13 8.5L18.5 12L18.5 12L13 15.5Z", on: "M6.5 5L10.5 5L10.5 19L6.5 19Z M13.5 5L17.5 5L17.5 19L13.5 19Z", filled: true, }, // The middle bar folds onto the second diagonal, so the X keeps three // strokes without a stray dot where a collapsed line would sit. menuClose: { off: "M4.5 7L19.5 7 M4.5 12L19.5 12 M4.5 17L19.5 17", on: "M6.5 6.5L17.5 17.5 M6.5 17.5L17.5 6.5 M6.5 17.5L17.5 6.5", // A quarter turn lands the X on itself, so the spin reads as the lines // swinging into place rather than the icon changing orientation. rotate: 90, }, // The vertical bar lies down onto the horizontal one. A half turn keeps // the minus horizontal where a quarter turn would stand it upright. plusMinus: { off: "M5 12L19 12 M12 5L12 19", on: "M5 12L19 12 M5 12L19 12", rotate: 180, }, // The shaft shrinks into the short leg of the check, which the head also // traces, so the two overlap once settled. sendSent: { off: "M5 12L19 12 M13 6L19 12L13 18", on: "M5 12.5L9.5 17 M5 12.5L9.5 17L19 7", }, } satisfies Record; // Critically damped: an icon that overshoots its own outline looks broken. const MORPH = { type: "spring", visualDuration: 0.3, bounce: 0 } as const; // The turn gets a little give, which is what makes it feel physical. const TURN = { type: "spring", visualDuration: 0.35, bounce: 0.2 } as const; const FADE = { duration: 0.15, ease: [0.23, 1, 0.32, 1] } as const; export function IconMorphButton({ shape, label, captions, pressed: controlled, defaultPressed = false, onPressedChange, className, }: { shape: MorphShape; // The accessible name stays fixed and aria-pressed carries the state, so a // screen reader never hears a name and a state that contradict each other // ("Pause, pressed"). Matching the off caption keeps voice control working. label: string; // Visible text for each state, cross-faded as the icon morphs. captions?: [off: string, on: string]; pressed?: boolean; defaultPressed?: boolean; onPressedChange?: (pressed: boolean) => void; className?: string; }) { const reduceMotion = useReducedMotion(); const [uncontrolled, setUncontrolled] = useState(defaultPressed); const pressed = controlled ?? uncontrolled; const toggle = () => { const next = !pressed; if (controlled === undefined) setUncontrolled(next); onPressedChange?.(next); }; return (

{captions && ( // Both captions share one grid cell, so the column never changes // width as they swap. {captions.map((caption, i) => { const visible = pressed === (i === 1); return ( {caption} ); })} )}

); } const DEMO = [ { shape: SHAPES.playPause, label: "Play", captions: ["Play", "Pause"] }, { shape: SHAPES.menuClose, label: "Menu", captions: ["Menu", "Close"] }, { shape: SHAPES.plusMinus, label: "Expand", captions: ["Expand", "Collapse"], }, { shape: SHAPES.sendSent, label: "Send", captions: ["Send", "Sent"] }, ] as const; export default function IconMorphDemo() { return (

{DEMO.map((item) => ( ))}

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