Action Swap
CTA button and slot primitives for swapping text and icons with blur motion.
Cascade
action-swap-cascade.tsxLetter-by-letter slot roll — the old label's letters drop away as the new ones land, left to right.
TSXcomponents/previews/motion/action-swap-cascade.preview.tsx
"use client";
import { Check, Copy } from "lucide-react";
import {
ActionSwapCascadeButton,
type ActionSwapItem,
} from "@/components/motion/action-swap-cascade";
const CTA_ITEMS: ActionSwapItem[] = [
{
id: "copy",
label: "Copy link",
icon: <Copy className="h-4 w-4" />,
ariaLabel: "Copy link",
},
{
id: "copied",
label: "Copied!",
icon: <Check className="h-4 w-4" />,
ariaLabel: "Copied",
},
];
export function ActionSwapCascadePreview() {
return (
<div className="flex w-full justify-center">
<ActionSwapCascadeButton items={CTA_ITEMS} variant="primary" />
</div>
);
}
TSXcomponents/motion/action-swap-cascade.tsx
"use client";
// beui.dev/components/motion/action-swap
import {
ActionSwapButton,
ActionSwapIcon,
ActionSwapText,
type ActionSwapButtonProps,
type ActionSwapIconProps,
type ActionSwapTextProps,
} from "./action-swap";
export type {
ActionSwapButtonSize,
ActionSwapButtonVariant,
ActionSwapItem,
} from "./action-swap";
export type ActionSwapCascadeButtonProps = Omit<ActionSwapButtonProps, "animation">;
export type ActionSwapCascadeTextProps = Omit<ActionSwapTextProps, "animation">;
export type ActionSwapCascadeIconProps = Omit<ActionSwapIconProps, "animation">;
export function ActionSwapCascadeButton(props: ActionSwapCascadeButtonProps) {
return <ActionSwapButton {...props} animation="cascade" />;
}
export function ActionSwapCascadeText(props: ActionSwapCascadeTextProps) {
return <ActionSwapText {...props} animation="cascade" />;
}
export function ActionSwapCascadeIcon(props: ActionSwapCascadeIconProps) {
return <ActionSwapIcon {...props} animation="cascade" />;
}
Install
$ bunx --bun shadcn add @beui/action-swap-cascade
Needs the theme tokens once. Already ran
shadcn init? You are set. Theme setupInstall dependencies
npm i clsx lucide-react motion tailwind-mergeAdd util files
TSXlib/ease.ts
// Shared motion tokens. Easing curves mirror the CSS custom properties in
// globals.css; springs are the canonical physics used across components.
// Strong custom variants — defaults like `ease-in`/`ease-out` feel weak.
export const EASE_OUT = [0.16, 1, 0.3, 1] as const;
export const EASE_IN_OUT = [0.77, 0, 0.175, 1] as const;
export const EASE_DRAWER = [0.32, 0.72, 0, 1] as const;
/** CSS string form of EASE_OUT for inline style transitions. */
export const EASE_OUT_CSS = "cubic-bezier(0.16, 1, 0.3, 1)";
/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
type: "spring",
stiffness: 500,
damping: 30,
mass: 0.6,
} as const;
/** Content swaps — label/icon slots trading places inside a control. */
export const SPRING_SWAP = {
type: "spring",
stiffness: 460,
damping: 30,
mass: 0.55,
} as const;
/** Overlay panel entrances — modals and sheets summoned by pointer. */
export const SPRING_PANEL = {
type: "spring",
stiffness: 420,
damping: 40,
mass: 0.5,
} as const;
/** Shared-layout glides — pills, indicators and panels morphing between positions. */
export const SPRING_LAYOUT = {
type: "spring",
stiffness: 360,
damping: 32,
mass: 0.6,
} as const;
/** Cursor-follow physics for decorative mouse tracking (magnetic, tilt, dock). */
export const SPRING_MOUSE = {
stiffness: 200,
damping: 15,
mass: 0.3,
} as const;
/** Dragged handles and fills (sliders) — critically damped `useSpring` config,
* so the value follows the pointer butterily and never rebounds off an end. */
export const SPRING_GLIDE = {
stiffness: 700,
damping: 50,
mass: 0.5,
} as const;
TSXlib/utils.ts
import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"
export function cn(...inputs: ClassValue[]) {
return twMerge(clsx(inputs))
}
Copy the source code
TSXcomponents/motion/action-swap-cascade.tsx
"use client";
// beui.dev/components/motion/action-swap
import {
ActionSwapButton,
ActionSwapIcon,
ActionSwapText,
type ActionSwapButtonProps,
type ActionSwapIconProps,
type ActionSwapTextProps,
} from "./action-swap";
export type {
ActionSwapButtonSize,
ActionSwapButtonVariant,
ActionSwapItem,
} from "./action-swap";
export type ActionSwapCascadeButtonProps = Omit<ActionSwapButtonProps, "animation">;
export type ActionSwapCascadeTextProps = Omit<ActionSwapTextProps, "animation">;
export type ActionSwapCascadeIconProps = Omit<ActionSwapIconProps, "animation">;
export function ActionSwapCascadeButton(props: ActionSwapCascadeButtonProps) {
return <ActionSwapButton {...props} animation="cascade" />;
}
export function ActionSwapCascadeText(props: ActionSwapCascadeTextProps) {
return <ActionSwapText {...props} animation="cascade" />;
}
export function ActionSwapCascadeIcon(props: ActionSwapCascadeIconProps) {
return <ActionSwapIcon {...props} animation="cascade" />;
}
TSXcomponents/motion/action-swap.tsx
"use client";
import { AnimatePresence, motion, useReducedMotion, type HTMLMotionProps, type Variants } from "motion/react";
import { useLayoutEffect, useRef, useState, type ReactNode } from "react";
import { EASE_OUT, EASE_OUT_CSS, SPRING_PRESS, SPRING_SWAP } from "@/lib/ease";
import { cn } from "@/lib/utils";
export type ActionSwapItem = {
id: string;
label: ReactNode;
icon?: ReactNode;
ariaLabel?: string;
};
export type ActionSwapButtonVariant = "primary" | "secondary" | "outline" | "ghost";
export type ActionSwapButtonSize = "sm" | "md" | "lg" | "icon";
export type ActionSwapAnimation = "blur" | "roll" | "cascade";
/** Animations with a single-element variant set (cascade animates per letter). */
type CoreAnimation = "blur" | "roll";
export interface ActionSwapButtonProps extends Omit<
HTMLMotionProps<"button">,
"children" | "onChange"
> {
items: ActionSwapItem[];
value?: string;
defaultValue?: string;
onValueChange?: (value: string, item: ActionSwapItem) => void;
variant?: ActionSwapButtonVariant;
size?: ActionSwapButtonSize;
animation?: ActionSwapAnimation;
iconOnly?: boolean;
cycle?: boolean;
}
export interface ActionSwapTextProps {
value: string;
children: ReactNode;
animation?: ActionSwapAnimation;
className?: string;
}
export interface ActionSwapIconProps {
value: string;
children: ReactNode;
animation?: ActionSwapAnimation;
className?: string;
}
const BLUR_TRANSITION = { duration: 0.2, ease: "easeInOut" } as const;
const ROLL_TRANSITION = SPRING_SWAP;
const ROLL_EXIT_TRANSITION = { duration: 0.14, ease: EASE_OUT } as const;
const SWAP_BLUR = "blur(8px)";
const ROLL_BLUR = "blur(3px)";
// Cascade rolls the label one letter at a time, left to right. The leaving
// and landing strings overlap as independent layers (no shared cells), so
// proportional glyph widths never jitter. Exits cascade at half the enter
// stagger so the tail of the old label lingers briefly.
const CASCADE_STAGGER = 0.025;
const CASCADE_LETTER_VARIANTS: Variants = {
initial: { opacity: 0, y: "105%", filter: ROLL_BLUR },
animate: (delay: number = 0) => ({
opacity: 1,
y: "0%",
filter: "blur(0px)",
transition: { ...SPRING_SWAP, delay },
}),
exit: (delay: number = 0) => ({
opacity: 0,
y: "-105%",
filter: ROLL_BLUR,
transition: { duration: 0.16, ease: EASE_OUT, delay: delay * 0.5 },
}),
};
const TEXT_VARIANTS: Record<CoreAnimation, Variants> = {
blur: {
initial: { opacity: 0, scale: 0.94, filter: SWAP_BLUR },
animate: {
opacity: 1,
scale: 1,
filter: "blur(0px)",
transition: BLUR_TRANSITION,
},
exit: {
opacity: 0,
scale: 0.94,
filter: SWAP_BLUR,
transition: BLUR_TRANSITION,
},
},
roll: {
initial: { opacity: 0, y: "90%", filter: ROLL_BLUR },
animate: {
opacity: 1,
y: "0%",
filter: "blur(0px)",
transition: ROLL_TRANSITION,
},
exit: {
opacity: 0,
y: "-90%",
filter: ROLL_BLUR,
transition: ROLL_EXIT_TRANSITION,
},
},
};
const ICON_VARIANTS: Record<CoreAnimation, Variants> = {
blur: {
initial: { opacity: 0, scale: 0.25, filter: SWAP_BLUR },
animate: {
opacity: 1,
scale: 1,
filter: "blur(0px)",
transition: BLUR_TRANSITION,
},
exit: {
opacity: 0,
scale: 0.25,
filter: SWAP_BLUR,
transition: BLUR_TRANSITION,
},
},
roll: {
initial: { opacity: 0, y: 12, filter: ROLL_BLUR },
animate: {
opacity: 1,
y: 0,
filter: "blur(0px)",
transition: ROLL_TRANSITION,
},
exit: {
opacity: 0,
y: -12,
filter: ROLL_BLUR,
transition: ROLL_EXIT_TRANSITION,
},
},
};
const VARIANT_CLASS: Record<ActionSwapButtonVariant, string> = {
primary: "bg-primary text-primary-foreground hover:bg-primary/90",
secondary: "border border-border bg-card text-foreground hover:border-border",
outline: "border border-border bg-transparent text-foreground hover:bg-primary/5",
ghost: "text-muted-foreground hover:bg-primary/5 hover:text-foreground",
};
const SIZE_CLASS: Record<ActionSwapButtonSize, string> = {
sm: "h-8 gap-1.5 rounded-full px-3 text-xs",
md: "h-10 gap-2 rounded-full px-4 text-sm",
lg: "h-12 gap-2.5 rounded-full px-5 text-base",
icon: "h-10 w-10 rounded-full",
};
export function ActionSwapText({
value,
children,
animation = "blur",
className,
}: ActionSwapTextProps) {
const reduce = useReducedMotion();
const measureRef = useRef<HTMLSpanElement>(null);
const [width, setWidth] = useState<number>();
useLayoutEffect(() => {
const nextWidth = measureRef.current?.offsetWidth;
if (!nextWidth) return;
setWidth((currentWidth) => (currentWidth === nextWidth ? currentWidth : nextWidth));
});
// Cascade needs a plain string to split into letters; non-string content
// and reduced motion fall back to the closest single-element animation.
const label = typeof children === "string" ? children : null;
const cascade = animation === "cascade" && label !== null && !reduce;
const coreAnimation: CoreAnimation =
animation === "cascade" ? "roll" : animation;
return (
<span
className={cn("relative inline-block overflow-hidden whitespace-nowrap align-bottom", className)}
style={{
width,
transition: reduce ? undefined : `width 220ms ${EASE_OUT_CSS}`,
}}
>
<span
ref={measureRef}
aria-hidden
className="invisible inline-block whitespace-nowrap"
>
{children}
</span>
{cascade ? (
<>
{/* Letters are decorative fragments; readers get the whole label. */}
<span className="sr-only">{label}</span>
<AnimatePresence initial={false}>
<motion.span
key={`cascade-${value}`}
aria-hidden
initial="initial"
animate="animate"
exit="exit"
className="absolute left-0 top-0 inline-block whitespace-pre"
>
{label.split("").map((char, i) => (
<motion.span
// biome-ignore lint/suspicious/noArrayIndexKey: position is the slot identity — the letter at a position is exactly what rolls.
key={i}
custom={i * CASCADE_STAGGER}
variants={CASCADE_LETTER_VARIANTS}
className="inline-block whitespace-pre will-change-[opacity,filter,transform]"
>
{char}
</motion.span>
))}
</motion.span>
</AnimatePresence>
</>
) : (
<AnimatePresence initial={false}>
<motion.span
key={`${animation}-${value}`}
variants={TEXT_VARIANTS[coreAnimation]}
initial={reduce ? false : "initial"}
animate={reduce ? { opacity: 1, filter: "blur(0px)", scale: 1, y: 0 } : "animate"}
exit={reduce ? undefined : "exit"}
className="absolute left-0 top-0 inline-block will-change-[opacity,filter,transform]"
>
{children}
</motion.span>
</AnimatePresence>
)}
</span>
);
}
export function ActionSwapIcon({
value,
children,
animation = "blur",
className,
}: ActionSwapIconProps) {
const reduce = useReducedMotion();
// Icons are single elements — cascade maps to its closest motion, roll.
const coreAnimation: CoreAnimation =
animation === "cascade" ? "roll" : animation;
return (
<span className={cn("relative inline-grid shrink-0 place-items-center overflow-hidden", className)}>
<AnimatePresence mode="popLayout" initial={false}>
<motion.span
key={`${animation}-${value}`}
aria-hidden
variants={ICON_VARIANTS[coreAnimation]}
initial={reduce ? false : "initial"}
animate={reduce ? { opacity: 1, filter: "blur(0px)", scale: 1, y: 0 } : "animate"}
exit={reduce ? undefined : "exit"}
className="col-start-1 row-start-1 inline-flex items-center justify-center will-change-[opacity,filter,transform]"
>
{children}
</motion.span>
</AnimatePresence>
</span>
);
}
export function ActionSwapButton({
items,
value,
defaultValue,
onValueChange,
variant = "secondary",
size = "md",
animation = "blur",
iconOnly = size === "icon",
cycle = true,
className,
disabled,
onClick,
...rest
}: ActionSwapButtonProps) {
const reduce = useReducedMotion();
const [internalValue, setInternalValue] = useState(defaultValue ?? items[0]?.id);
const currentValue = value ?? internalValue;
const activeIndex = Math.max(0, items.findIndex((item) => item.id === currentValue));
const activeItem = items[activeIndex] ?? items[0];
const hasIcon = items.some((item) => item.icon);
const nextItem = cycle && items.length > 0 ? items[(activeIndex + 1) % items.length] : undefined;
if (!activeItem) return null;
const accessibleLabel = activeItem.ariaLabel ?? (iconOnly && typeof activeItem.label === "string" ? activeItem.label : undefined);
return (
<motion.button
type="button"
disabled={disabled}
whileTap={reduce || disabled ? undefined : { scale: 0.97 }}
transition={SPRING_PRESS}
className={cn(
"inline-flex items-center justify-center overflow-hidden font-medium transition-colors",
"disabled:pointer-events-none disabled:opacity-50",
VARIANT_CLASS[variant],
SIZE_CLASS[size],
className,
)}
aria-label={accessibleLabel}
onClick={(event) => {
onClick?.(event);
if (event.defaultPrevented || disabled || !cycle || !nextItem) return;
if (value === undefined) setInternalValue(nextItem.id);
onValueChange?.(nextItem.id, nextItem);
}}
{...rest}
>
{hasIcon ? (
<ActionSwapIcon value={activeItem.id} animation={animation} className="h-4 w-4">
{activeItem.icon ?? null}
</ActionSwapIcon>
) : null}
{!iconOnly ? (
<ActionSwapText value={activeItem.id} animation={animation}>
{activeItem.label}
</ActionSwapText>
) : null}
</motion.button>
);
}
API Reference
Blur
action-swap-blur.tsxCopy-button style swap with blur, opacity and scale.
TSXcomponents/previews/motion/action-swap-blur.preview.tsx
"use client";
import { Check, Copy, Moon, Sun } from "lucide-react";
import { useState } from "react";
import {
ActionSwapBlurButton,
type ActionSwapItem,
} from "@/components/motion/action-swap-blur";
const TEXT_ITEMS: ActionSwapItem[] = [
{ id: "copy", label: "Copy" },
{ id: "copied", label: "Copied" },
];
const ICON_ITEMS: ActionSwapItem[] = [
{
id: "light",
label: "Light",
icon: <Sun className="h-4 w-4" />,
ariaLabel: "Use light theme",
},
{
id: "dark",
label: "Dark",
icon: <Moon className="h-4 w-4" />,
ariaLabel: "Use dark theme",
},
];
const CTA_ITEMS: ActionSwapItem[] = [
{
id: "copy",
label: "Copy link",
icon: <Copy className="h-4 w-4" />,
ariaLabel: "Copy link",
},
{
id: "copied",
label: "Copied",
icon: <Check className="h-4 w-4" />,
ariaLabel: "Copied",
},
];
export function ActionSwapBlurPreview() {
const [textValue, setTextValue] = useState(TEXT_ITEMS[0]?.id);
const [iconValue, setIconValue] = useState(ICON_ITEMS[0]?.id);
const [ctaValue, setCtaValue] = useState(CTA_ITEMS[0]?.id);
return (
<div className="flex flex-wrap items-center justify-center gap-3">
<ActionSwapBlurButton
items={TEXT_ITEMS}
value={textValue}
onValueChange={setTextValue}
variant="secondary"
/>
<ActionSwapBlurButton
items={ICON_ITEMS}
value={iconValue}
onValueChange={setIconValue}
variant="outline"
size="icon"
iconOnly
/>
<ActionSwapBlurButton
items={CTA_ITEMS}
value={ctaValue}
onValueChange={setCtaValue}
variant="primary"
/>
</div>
);
}
TSXcomponents/motion/action-swap-blur.tsx
"use client";
// beui.dev/components/motion/action-swap
import {
ActionSwapButton,
ActionSwapIcon,
ActionSwapText,
type ActionSwapButtonProps,
type ActionSwapIconProps,
type ActionSwapTextProps,
} from "./action-swap";
export type {
ActionSwapButtonSize,
ActionSwapButtonVariant,
ActionSwapItem,
} from "./action-swap";
export type ActionSwapBlurButtonProps = Omit<ActionSwapButtonProps, "animation">;
export type ActionSwapBlurTextProps = Omit<ActionSwapTextProps, "animation">;
export type ActionSwapBlurIconProps = Omit<ActionSwapIconProps, "animation">;
export function ActionSwapBlurButton(props: ActionSwapBlurButtonProps) {
return <ActionSwapButton {...props} animation="blur" />;
}
export function ActionSwapBlurText(props: ActionSwapBlurTextProps) {
return <ActionSwapText {...props} animation="blur" />;
}
export function ActionSwapBlurIcon(props: ActionSwapBlurIconProps) {
return <ActionSwapIcon {...props} animation="blur" />;
}
Install
$ bunx --bun shadcn add @beui/action-swap-blur
Needs the theme tokens once. Already ran
shadcn init? You are set. Theme setupInstall dependencies
npm i clsx lucide-react motion tailwind-mergeAdd util files
TSXlib/ease.ts
// Shared motion tokens. Easing curves mirror the CSS custom properties in
// globals.css; springs are the canonical physics used across components.
// Strong custom variants — defaults like `ease-in`/`ease-out` feel weak.
export const EASE_OUT = [0.16, 1, 0.3, 1] as const;
export const EASE_IN_OUT = [0.77, 0, 0.175, 1] as const;
export const EASE_DRAWER = [0.32, 0.72, 0, 1] as const;
/** CSS string form of EASE_OUT for inline style transitions. */
export const EASE_OUT_CSS = "cubic-bezier(0.16, 1, 0.3, 1)";
/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
type: "spring",
stiffness: 500,
damping: 30,
mass: 0.6,
} as const;
/** Content swaps — label/icon slots trading places inside a control. */
export const SPRING_SWAP = {
type: "spring",
stiffness: 460,
damping: 30,
mass: 0.55,
} as const;
/** Overlay panel entrances — modals and sheets summoned by pointer. */
export const SPRING_PANEL = {
type: "spring",
stiffness: 420,
damping: 40,
mass: 0.5,
} as const;
/** Shared-layout glides — pills, indicators and panels morphing between positions. */
export const SPRING_LAYOUT = {
type: "spring",
stiffness: 360,
damping: 32,
mass: 0.6,
} as const;
/** Cursor-follow physics for decorative mouse tracking (magnetic, tilt, dock). */
export const SPRING_MOUSE = {
stiffness: 200,
damping: 15,
mass: 0.3,
} as const;
/** Dragged handles and fills (sliders) — critically damped `useSpring` config,
* so the value follows the pointer butterily and never rebounds off an end. */
export const SPRING_GLIDE = {
stiffness: 700,
damping: 50,
mass: 0.5,
} as const;
TSXlib/utils.ts
import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"
export function cn(...inputs: ClassValue[]) {
return twMerge(clsx(inputs))
}
Copy the source code
TSXcomponents/motion/action-swap-blur.tsx
"use client";
// beui.dev/components/motion/action-swap
import {
ActionSwapButton,
ActionSwapIcon,
ActionSwapText,
type ActionSwapButtonProps,
type ActionSwapIconProps,
type ActionSwapTextProps,
} from "./action-swap";
export type {
ActionSwapButtonSize,
ActionSwapButtonVariant,
ActionSwapItem,
} from "./action-swap";
export type ActionSwapBlurButtonProps = Omit<ActionSwapButtonProps, "animation">;
export type ActionSwapBlurTextProps = Omit<ActionSwapTextProps, "animation">;
export type ActionSwapBlurIconProps = Omit<ActionSwapIconProps, "animation">;
export function ActionSwapBlurButton(props: ActionSwapBlurButtonProps) {
return <ActionSwapButton {...props} animation="blur" />;
}
export function ActionSwapBlurText(props: ActionSwapBlurTextProps) {
return <ActionSwapText {...props} animation="blur" />;
}
export function ActionSwapBlurIcon(props: ActionSwapBlurIconProps) {
return <ActionSwapIcon {...props} animation="blur" />;
}
TSXcomponents/motion/action-swap.tsx
"use client";
import { AnimatePresence, motion, useReducedMotion, type HTMLMotionProps, type Variants } from "motion/react";
import { useLayoutEffect, useRef, useState, type ReactNode } from "react";
import { EASE_OUT, EASE_OUT_CSS, SPRING_PRESS, SPRING_SWAP } from "@/lib/ease";
import { cn } from "@/lib/utils";
export type ActionSwapItem = {
id: string;
label: ReactNode;
icon?: ReactNode;
ariaLabel?: string;
};
export type ActionSwapButtonVariant = "primary" | "secondary" | "outline" | "ghost";
export type ActionSwapButtonSize = "sm" | "md" | "lg" | "icon";
export type ActionSwapAnimation = "blur" | "roll" | "cascade";
/** Animations with a single-element variant set (cascade animates per letter). */
type CoreAnimation = "blur" | "roll";
export interface ActionSwapButtonProps extends Omit<
HTMLMotionProps<"button">,
"children" | "onChange"
> {
items: ActionSwapItem[];
value?: string;
defaultValue?: string;
onValueChange?: (value: string, item: ActionSwapItem) => void;
variant?: ActionSwapButtonVariant;
size?: ActionSwapButtonSize;
animation?: ActionSwapAnimation;
iconOnly?: boolean;
cycle?: boolean;
}
export interface ActionSwapTextProps {
value: string;
children: ReactNode;
animation?: ActionSwapAnimation;
className?: string;
}
export interface ActionSwapIconProps {
value: string;
children: ReactNode;
animation?: ActionSwapAnimation;
className?: string;
}
const BLUR_TRANSITION = { duration: 0.2, ease: "easeInOut" } as const;
const ROLL_TRANSITION = SPRING_SWAP;
const ROLL_EXIT_TRANSITION = { duration: 0.14, ease: EASE_OUT } as const;
const SWAP_BLUR = "blur(8px)";
const ROLL_BLUR = "blur(3px)";
// Cascade rolls the label one letter at a time, left to right. The leaving
// and landing strings overlap as independent layers (no shared cells), so
// proportional glyph widths never jitter. Exits cascade at half the enter
// stagger so the tail of the old label lingers briefly.
const CASCADE_STAGGER = 0.025;
const CASCADE_LETTER_VARIANTS: Variants = {
initial: { opacity: 0, y: "105%", filter: ROLL_BLUR },
animate: (delay: number = 0) => ({
opacity: 1,
y: "0%",
filter: "blur(0px)",
transition: { ...SPRING_SWAP, delay },
}),
exit: (delay: number = 0) => ({
opacity: 0,
y: "-105%",
filter: ROLL_BLUR,
transition: { duration: 0.16, ease: EASE_OUT, delay: delay * 0.5 },
}),
};
const TEXT_VARIANTS: Record<CoreAnimation, Variants> = {
blur: {
initial: { opacity: 0, scale: 0.94, filter: SWAP_BLUR },
animate: {
opacity: 1,
scale: 1,
filter: "blur(0px)",
transition: BLUR_TRANSITION,
},
exit: {
opacity: 0,
scale: 0.94,
filter: SWAP_BLUR,
transition: BLUR_TRANSITION,
},
},
roll: {
initial: { opacity: 0, y: "90%", filter: ROLL_BLUR },
animate: {
opacity: 1,
y: "0%",
filter: "blur(0px)",
transition: ROLL_TRANSITION,
},
exit: {
opacity: 0,
y: "-90%",
filter: ROLL_BLUR,
transition: ROLL_EXIT_TRANSITION,
},
},
};
const ICON_VARIANTS: Record<CoreAnimation, Variants> = {
blur: {
initial: { opacity: 0, scale: 0.25, filter: SWAP_BLUR },
animate: {
opacity: 1,
scale: 1,
filter: "blur(0px)",
transition: BLUR_TRANSITION,
},
exit: {
opacity: 0,
scale: 0.25,
filter: SWAP_BLUR,
transition: BLUR_TRANSITION,
},
},
roll: {
initial: { opacity: 0, y: 12, filter: ROLL_BLUR },
animate: {
opacity: 1,
y: 0,
filter: "blur(0px)",
transition: ROLL_TRANSITION,
},
exit: {
opacity: 0,
y: -12,
filter: ROLL_BLUR,
transition: ROLL_EXIT_TRANSITION,
},
},
};
const VARIANT_CLASS: Record<ActionSwapButtonVariant, string> = {
primary: "bg-primary text-primary-foreground hover:bg-primary/90",
secondary: "border border-border bg-card text-foreground hover:border-border",
outline: "border border-border bg-transparent text-foreground hover:bg-primary/5",
ghost: "text-muted-foreground hover:bg-primary/5 hover:text-foreground",
};
const SIZE_CLASS: Record<ActionSwapButtonSize, string> = {
sm: "h-8 gap-1.5 rounded-full px-3 text-xs",
md: "h-10 gap-2 rounded-full px-4 text-sm",
lg: "h-12 gap-2.5 rounded-full px-5 text-base",
icon: "h-10 w-10 rounded-full",
};
export function ActionSwapText({
value,
children,
animation = "blur",
className,
}: ActionSwapTextProps) {
const reduce = useReducedMotion();
const measureRef = useRef<HTMLSpanElement>(null);
const [width, setWidth] = useState<number>();
useLayoutEffect(() => {
const nextWidth = measureRef.current?.offsetWidth;
if (!nextWidth) return;
setWidth((currentWidth) => (currentWidth === nextWidth ? currentWidth : nextWidth));
});
// Cascade needs a plain string to split into letters; non-string content
// and reduced motion fall back to the closest single-element animation.
const label = typeof children === "string" ? children : null;
const cascade = animation === "cascade" && label !== null && !reduce;
const coreAnimation: CoreAnimation =
animation === "cascade" ? "roll" : animation;
return (
<span
className={cn("relative inline-block overflow-hidden whitespace-nowrap align-bottom", className)}
style={{
width,
transition: reduce ? undefined : `width 220ms ${EASE_OUT_CSS}`,
}}
>
<span
ref={measureRef}
aria-hidden
className="invisible inline-block whitespace-nowrap"
>
{children}
</span>
{cascade ? (
<>
{/* Letters are decorative fragments; readers get the whole label. */}
<span className="sr-only">{label}</span>
<AnimatePresence initial={false}>
<motion.span
key={`cascade-${value}`}
aria-hidden
initial="initial"
animate="animate"
exit="exit"
className="absolute left-0 top-0 inline-block whitespace-pre"
>
{label.split("").map((char, i) => (
<motion.span
// biome-ignore lint/suspicious/noArrayIndexKey: position is the slot identity — the letter at a position is exactly what rolls.
key={i}
custom={i * CASCADE_STAGGER}
variants={CASCADE_LETTER_VARIANTS}
className="inline-block whitespace-pre will-change-[opacity,filter,transform]"
>
{char}
</motion.span>
))}
</motion.span>
</AnimatePresence>
</>
) : (
<AnimatePresence initial={false}>
<motion.span
key={`${animation}-${value}`}
variants={TEXT_VARIANTS[coreAnimation]}
initial={reduce ? false : "initial"}
animate={reduce ? { opacity: 1, filter: "blur(0px)", scale: 1, y: 0 } : "animate"}
exit={reduce ? undefined : "exit"}
className="absolute left-0 top-0 inline-block will-change-[opacity,filter,transform]"
>
{children}
</motion.span>
</AnimatePresence>
)}
</span>
);
}
export function ActionSwapIcon({
value,
children,
animation = "blur",
className,
}: ActionSwapIconProps) {
const reduce = useReducedMotion();
// Icons are single elements — cascade maps to its closest motion, roll.
const coreAnimation: CoreAnimation =
animation === "cascade" ? "roll" : animation;
return (
<span className={cn("relative inline-grid shrink-0 place-items-center overflow-hidden", className)}>
<AnimatePresence mode="popLayout" initial={false}>
<motion.span
key={`${animation}-${value}`}
aria-hidden
variants={ICON_VARIANTS[coreAnimation]}
initial={reduce ? false : "initial"}
animate={reduce ? { opacity: 1, filter: "blur(0px)", scale: 1, y: 0 } : "animate"}
exit={reduce ? undefined : "exit"}
className="col-start-1 row-start-1 inline-flex items-center justify-center will-change-[opacity,filter,transform]"
>
{children}
</motion.span>
</AnimatePresence>
</span>
);
}
export function ActionSwapButton({
items,
value,
defaultValue,
onValueChange,
variant = "secondary",
size = "md",
animation = "blur",
iconOnly = size === "icon",
cycle = true,
className,
disabled,
onClick,
...rest
}: ActionSwapButtonProps) {
const reduce = useReducedMotion();
const [internalValue, setInternalValue] = useState(defaultValue ?? items[0]?.id);
const currentValue = value ?? internalValue;
const activeIndex = Math.max(0, items.findIndex((item) => item.id === currentValue));
const activeItem = items[activeIndex] ?? items[0];
const hasIcon = items.some((item) => item.icon);
const nextItem = cycle && items.length > 0 ? items[(activeIndex + 1) % items.length] : undefined;
if (!activeItem) return null;
const accessibleLabel = activeItem.ariaLabel ?? (iconOnly && typeof activeItem.label === "string" ? activeItem.label : undefined);
return (
<motion.button
type="button"
disabled={disabled}
whileTap={reduce || disabled ? undefined : { scale: 0.97 }}
transition={SPRING_PRESS}
className={cn(
"inline-flex items-center justify-center overflow-hidden font-medium transition-colors",
"disabled:pointer-events-none disabled:opacity-50",
VARIANT_CLASS[variant],
SIZE_CLASS[size],
className,
)}
aria-label={accessibleLabel}
onClick={(event) => {
onClick?.(event);
if (event.defaultPrevented || disabled || !cycle || !nextItem) return;
if (value === undefined) setInternalValue(nextItem.id);
onValueChange?.(nextItem.id, nextItem);
}}
{...rest}
>
{hasIcon ? (
<ActionSwapIcon value={activeItem.id} animation={animation} className="h-4 w-4">
{activeItem.icon ?? null}
</ActionSwapIcon>
) : null}
{!iconOnly ? (
<ActionSwapText value={activeItem.id} animation={animation}>
{activeItem.label}
</ActionSwapText>
) : null}
</motion.button>
);
}
API Reference
Roll
action-swap-roll.tsxThe next text or icon rolls in from below with blur.
TSXcomponents/previews/motion/action-swap-roll.preview.tsx
"use client";
import { Moon, Send, Sparkles, Sun } from "lucide-react";
import { useState } from "react";
import {
type ActionSwapItem,
ActionSwapRollButton,
} from "@/components/motion/action-swap-roll";
const TEXT_ITEMS: ActionSwapItem[] = [
{ id: "idle", label: "Save" },
{ id: "done", label: "Saved" },
];
const ICON_ITEMS: ActionSwapItem[] = [
{
id: "light",
label: "Light",
icon: <Sun className="h-4 w-4" />,
ariaLabel: "Use light theme",
},
{
id: "dark",
label: "Dark",
icon: <Moon className="h-4 w-4" />,
ariaLabel: "Use dark theme",
},
];
const CTA_ITEMS: ActionSwapItem[] = [
{
id: "send",
label: "Send invite",
icon: <Send className="h-4 w-4" />,
ariaLabel: "Send invite",
},
{
id: "sent",
label: "Invite sent",
icon: <Sparkles className="h-4 w-4" />,
ariaLabel: "Invite sent",
},
];
export function ActionSwapRollPreview() {
const [textValue, setTextValue] = useState(TEXT_ITEMS[0]?.id);
const [iconValue, setIconValue] = useState(ICON_ITEMS[0]?.id);
const [ctaValue, setCtaValue] = useState(CTA_ITEMS[0]?.id);
return (
<div className="flex flex-wrap items-center justify-center gap-3">
<ActionSwapRollButton
items={TEXT_ITEMS}
value={textValue}
onValueChange={setTextValue}
variant="secondary"
/>
<ActionSwapRollButton
items={ICON_ITEMS}
value={iconValue}
onValueChange={setIconValue}
variant="outline"
size="icon"
iconOnly
/>
<ActionSwapRollButton
items={CTA_ITEMS}
value={ctaValue}
onValueChange={setCtaValue}
variant="primary"
/>
</div>
);
}
TSXcomponents/motion/action-swap-roll.tsx
"use client";
// beui.dev/components/motion/action-swap
import {
ActionSwapButton,
ActionSwapIcon,
ActionSwapText,
type ActionSwapButtonProps,
type ActionSwapIconProps,
type ActionSwapTextProps,
} from "./action-swap";
export type {
ActionSwapButtonSize,
ActionSwapButtonVariant,
ActionSwapItem,
} from "./action-swap";
export type ActionSwapRollButtonProps = Omit<ActionSwapButtonProps, "animation">;
export type ActionSwapRollTextProps = Omit<ActionSwapTextProps, "animation">;
export type ActionSwapRollIconProps = Omit<ActionSwapIconProps, "animation">;
export function ActionSwapRollButton(props: ActionSwapRollButtonProps) {
return <ActionSwapButton {...props} animation="roll" />;
}
export function ActionSwapRollText(props: ActionSwapRollTextProps) {
return <ActionSwapText {...props} animation="roll" />;
}
export function ActionSwapRollIcon(props: ActionSwapRollIconProps) {
return <ActionSwapIcon {...props} animation="roll" />;
}
Install
$ bunx --bun shadcn add @beui/action-swap-roll
Needs the theme tokens once. Already ran
shadcn init? You are set. Theme setupInstall dependencies
npm i clsx lucide-react motion tailwind-mergeAdd util files
TSXlib/ease.ts
// Shared motion tokens. Easing curves mirror the CSS custom properties in
// globals.css; springs are the canonical physics used across components.
// Strong custom variants — defaults like `ease-in`/`ease-out` feel weak.
export const EASE_OUT = [0.16, 1, 0.3, 1] as const;
export const EASE_IN_OUT = [0.77, 0, 0.175, 1] as const;
export const EASE_DRAWER = [0.32, 0.72, 0, 1] as const;
/** CSS string form of EASE_OUT for inline style transitions. */
export const EASE_OUT_CSS = "cubic-bezier(0.16, 1, 0.3, 1)";
/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
type: "spring",
stiffness: 500,
damping: 30,
mass: 0.6,
} as const;
/** Content swaps — label/icon slots trading places inside a control. */
export const SPRING_SWAP = {
type: "spring",
stiffness: 460,
damping: 30,
mass: 0.55,
} as const;
/** Overlay panel entrances — modals and sheets summoned by pointer. */
export const SPRING_PANEL = {
type: "spring",
stiffness: 420,
damping: 40,
mass: 0.5,
} as const;
/** Shared-layout glides — pills, indicators and panels morphing between positions. */
export const SPRING_LAYOUT = {
type: "spring",
stiffness: 360,
damping: 32,
mass: 0.6,
} as const;
/** Cursor-follow physics for decorative mouse tracking (magnetic, tilt, dock). */
export const SPRING_MOUSE = {
stiffness: 200,
damping: 15,
mass: 0.3,
} as const;
/** Dragged handles and fills (sliders) — critically damped `useSpring` config,
* so the value follows the pointer butterily and never rebounds off an end. */
export const SPRING_GLIDE = {
stiffness: 700,
damping: 50,
mass: 0.5,
} as const;
TSXlib/utils.ts
import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"
export function cn(...inputs: ClassValue[]) {
return twMerge(clsx(inputs))
}
Copy the source code
TSXcomponents/motion/action-swap-roll.tsx
"use client";
// beui.dev/components/motion/action-swap
import {
ActionSwapButton,
ActionSwapIcon,
ActionSwapText,
type ActionSwapButtonProps,
type ActionSwapIconProps,
type ActionSwapTextProps,
} from "./action-swap";
export type {
ActionSwapButtonSize,
ActionSwapButtonVariant,
ActionSwapItem,
} from "./action-swap";
export type ActionSwapRollButtonProps = Omit<ActionSwapButtonProps, "animation">;
export type ActionSwapRollTextProps = Omit<ActionSwapTextProps, "animation">;
export type ActionSwapRollIconProps = Omit<ActionSwapIconProps, "animation">;
export function ActionSwapRollButton(props: ActionSwapRollButtonProps) {
return <ActionSwapButton {...props} animation="roll" />;
}
export function ActionSwapRollText(props: ActionSwapRollTextProps) {
return <ActionSwapText {...props} animation="roll" />;
}
export function ActionSwapRollIcon(props: ActionSwapRollIconProps) {
return <ActionSwapIcon {...props} animation="roll" />;
}
TSXcomponents/motion/action-swap.tsx
"use client";
import { AnimatePresence, motion, useReducedMotion, type HTMLMotionProps, type Variants } from "motion/react";
import { useLayoutEffect, useRef, useState, type ReactNode } from "react";
import { EASE_OUT, EASE_OUT_CSS, SPRING_PRESS, SPRING_SWAP } from "@/lib/ease";
import { cn } from "@/lib/utils";
export type ActionSwapItem = {
id: string;
label: ReactNode;
icon?: ReactNode;
ariaLabel?: string;
};
export type ActionSwapButtonVariant = "primary" | "secondary" | "outline" | "ghost";
export type ActionSwapButtonSize = "sm" | "md" | "lg" | "icon";
export type ActionSwapAnimation = "blur" | "roll" | "cascade";
/** Animations with a single-element variant set (cascade animates per letter). */
type CoreAnimation = "blur" | "roll";
export interface ActionSwapButtonProps extends Omit<
HTMLMotionProps<"button">,
"children" | "onChange"
> {
items: ActionSwapItem[];
value?: string;
defaultValue?: string;
onValueChange?: (value: string, item: ActionSwapItem) => void;
variant?: ActionSwapButtonVariant;
size?: ActionSwapButtonSize;
animation?: ActionSwapAnimation;
iconOnly?: boolean;
cycle?: boolean;
}
export interface ActionSwapTextProps {
value: string;
children: ReactNode;
animation?: ActionSwapAnimation;
className?: string;
}
export interface ActionSwapIconProps {
value: string;
children: ReactNode;
animation?: ActionSwapAnimation;
className?: string;
}
const BLUR_TRANSITION = { duration: 0.2, ease: "easeInOut" } as const;
const ROLL_TRANSITION = SPRING_SWAP;
const ROLL_EXIT_TRANSITION = { duration: 0.14, ease: EASE_OUT } as const;
const SWAP_BLUR = "blur(8px)";
const ROLL_BLUR = "blur(3px)";
// Cascade rolls the label one letter at a time, left to right. The leaving
// and landing strings overlap as independent layers (no shared cells), so
// proportional glyph widths never jitter. Exits cascade at half the enter
// stagger so the tail of the old label lingers briefly.
const CASCADE_STAGGER = 0.025;
const CASCADE_LETTER_VARIANTS: Variants = {
initial: { opacity: 0, y: "105%", filter: ROLL_BLUR },
animate: (delay: number = 0) => ({
opacity: 1,
y: "0%",
filter: "blur(0px)",
transition: { ...SPRING_SWAP, delay },
}),
exit: (delay: number = 0) => ({
opacity: 0,
y: "-105%",
filter: ROLL_BLUR,
transition: { duration: 0.16, ease: EASE_OUT, delay: delay * 0.5 },
}),
};
const TEXT_VARIANTS: Record<CoreAnimation, Variants> = {
blur: {
initial: { opacity: 0, scale: 0.94, filter: SWAP_BLUR },
animate: {
opacity: 1,
scale: 1,
filter: "blur(0px)",
transition: BLUR_TRANSITION,
},
exit: {
opacity: 0,
scale: 0.94,
filter: SWAP_BLUR,
transition: BLUR_TRANSITION,
},
},
roll: {
initial: { opacity: 0, y: "90%", filter: ROLL_BLUR },
animate: {
opacity: 1,
y: "0%",
filter: "blur(0px)",
transition: ROLL_TRANSITION,
},
exit: {
opacity: 0,
y: "-90%",
filter: ROLL_BLUR,
transition: ROLL_EXIT_TRANSITION,
},
},
};
const ICON_VARIANTS: Record<CoreAnimation, Variants> = {
blur: {
initial: { opacity: 0, scale: 0.25, filter: SWAP_BLUR },
animate: {
opacity: 1,
scale: 1,
filter: "blur(0px)",
transition: BLUR_TRANSITION,
},
exit: {
opacity: 0,
scale: 0.25,
filter: SWAP_BLUR,
transition: BLUR_TRANSITION,
},
},
roll: {
initial: { opacity: 0, y: 12, filter: ROLL_BLUR },
animate: {
opacity: 1,
y: 0,
filter: "blur(0px)",
transition: ROLL_TRANSITION,
},
exit: {
opacity: 0,
y: -12,
filter: ROLL_BLUR,
transition: ROLL_EXIT_TRANSITION,
},
},
};
const VARIANT_CLASS: Record<ActionSwapButtonVariant, string> = {
primary: "bg-primary text-primary-foreground hover:bg-primary/90",
secondary: "border border-border bg-card text-foreground hover:border-border",
outline: "border border-border bg-transparent text-foreground hover:bg-primary/5",
ghost: "text-muted-foreground hover:bg-primary/5 hover:text-foreground",
};
const SIZE_CLASS: Record<ActionSwapButtonSize, string> = {
sm: "h-8 gap-1.5 rounded-full px-3 text-xs",
md: "h-10 gap-2 rounded-full px-4 text-sm",
lg: "h-12 gap-2.5 rounded-full px-5 text-base",
icon: "h-10 w-10 rounded-full",
};
export function ActionSwapText({
value,
children,
animation = "blur",
className,
}: ActionSwapTextProps) {
const reduce = useReducedMotion();
const measureRef = useRef<HTMLSpanElement>(null);
const [width, setWidth] = useState<number>();
useLayoutEffect(() => {
const nextWidth = measureRef.current?.offsetWidth;
if (!nextWidth) return;
setWidth((currentWidth) => (currentWidth === nextWidth ? currentWidth : nextWidth));
});
// Cascade needs a plain string to split into letters; non-string content
// and reduced motion fall back to the closest single-element animation.
const label = typeof children === "string" ? children : null;
const cascade = animation === "cascade" && label !== null && !reduce;
const coreAnimation: CoreAnimation =
animation === "cascade" ? "roll" : animation;
return (
<span
className={cn("relative inline-block overflow-hidden whitespace-nowrap align-bottom", className)}
style={{
width,
transition: reduce ? undefined : `width 220ms ${EASE_OUT_CSS}`,
}}
>
<span
ref={measureRef}
aria-hidden
className="invisible inline-block whitespace-nowrap"
>
{children}
</span>
{cascade ? (
<>
{/* Letters are decorative fragments; readers get the whole label. */}
<span className="sr-only">{label}</span>
<AnimatePresence initial={false}>
<motion.span
key={`cascade-${value}`}
aria-hidden
initial="initial"
animate="animate"
exit="exit"
className="absolute left-0 top-0 inline-block whitespace-pre"
>
{label.split("").map((char, i) => (
<motion.span
// biome-ignore lint/suspicious/noArrayIndexKey: position is the slot identity — the letter at a position is exactly what rolls.
key={i}
custom={i * CASCADE_STAGGER}
variants={CASCADE_LETTER_VARIANTS}
className="inline-block whitespace-pre will-change-[opacity,filter,transform]"
>
{char}
</motion.span>
))}
</motion.span>
</AnimatePresence>
</>
) : (
<AnimatePresence initial={false}>
<motion.span
key={`${animation}-${value}`}
variants={TEXT_VARIANTS[coreAnimation]}
initial={reduce ? false : "initial"}
animate={reduce ? { opacity: 1, filter: "blur(0px)", scale: 1, y: 0 } : "animate"}
exit={reduce ? undefined : "exit"}
className="absolute left-0 top-0 inline-block will-change-[opacity,filter,transform]"
>
{children}
</motion.span>
</AnimatePresence>
)}
</span>
);
}
export function ActionSwapIcon({
value,
children,
animation = "blur",
className,
}: ActionSwapIconProps) {
const reduce = useReducedMotion();
// Icons are single elements — cascade maps to its closest motion, roll.
const coreAnimation: CoreAnimation =
animation === "cascade" ? "roll" : animation;
return (
<span className={cn("relative inline-grid shrink-0 place-items-center overflow-hidden", className)}>
<AnimatePresence mode="popLayout" initial={false}>
<motion.span
key={`${animation}-${value}`}
aria-hidden
variants={ICON_VARIANTS[coreAnimation]}
initial={reduce ? false : "initial"}
animate={reduce ? { opacity: 1, filter: "blur(0px)", scale: 1, y: 0 } : "animate"}
exit={reduce ? undefined : "exit"}
className="col-start-1 row-start-1 inline-flex items-center justify-center will-change-[opacity,filter,transform]"
>
{children}
</motion.span>
</AnimatePresence>
</span>
);
}
export function ActionSwapButton({
items,
value,
defaultValue,
onValueChange,
variant = "secondary",
size = "md",
animation = "blur",
iconOnly = size === "icon",
cycle = true,
className,
disabled,
onClick,
...rest
}: ActionSwapButtonProps) {
const reduce = useReducedMotion();
const [internalValue, setInternalValue] = useState(defaultValue ?? items[0]?.id);
const currentValue = value ?? internalValue;
const activeIndex = Math.max(0, items.findIndex((item) => item.id === currentValue));
const activeItem = items[activeIndex] ?? items[0];
const hasIcon = items.some((item) => item.icon);
const nextItem = cycle && items.length > 0 ? items[(activeIndex + 1) % items.length] : undefined;
if (!activeItem) return null;
const accessibleLabel = activeItem.ariaLabel ?? (iconOnly && typeof activeItem.label === "string" ? activeItem.label : undefined);
return (
<motion.button
type="button"
disabled={disabled}
whileTap={reduce || disabled ? undefined : { scale: 0.97 }}
transition={SPRING_PRESS}
className={cn(
"inline-flex items-center justify-center overflow-hidden font-medium transition-colors",
"disabled:pointer-events-none disabled:opacity-50",
VARIANT_CLASS[variant],
SIZE_CLASS[size],
className,
)}
aria-label={accessibleLabel}
onClick={(event) => {
onClick?.(event);
if (event.defaultPrevented || disabled || !cycle || !nextItem) return;
if (value === undefined) setInternalValue(nextItem.id);
onValueChange?.(nextItem.id, nextItem);
}}
{...rest}
>
{hasIcon ? (
<ActionSwapIcon value={activeItem.id} animation={animation} className="h-4 w-4">
{activeItem.icon ?? null}
</ActionSwapIcon>
) : null}
{!iconOnly ? (
<ActionSwapText value={activeItem.id} animation={animation}>
{activeItem.label}
</ActionSwapText>
) : null}
</motion.button>
);
}
API Reference
Keep in mind
Some components on this site are inspired by or recreated from existing work across the web. I'm not here to take credit; just to learn, experiment, and sometimes push things a bit further. If something looks familiar and I forgot to mention you, reach out and I'll fix that right away.
Updated