A filled bar with a line cut into it: press anywhere and the ink runs there on a cubic, drag and it catches your finger a tenth of a second late.
The prompt18,843 characters
Add the "Slider" component from notboring to my project.
It is licensed for use in my projects — notboring.dev/license. Please:
1. Create the component at a sensible path for this
project, named Slider, from the source below.
2. Install what it needs: npm i framer-motion
3. Add the CSS to the project's stylesheet.
4. THE PART THAT NEEDS YOUR JUDGMENT. The CSS reads
these custom properties and does not define them:
--card
--font-ui
--ink
--ink-3
--ink-4
--ink-rgb
They are notboring's design tokens. Map each one to
whatever this project already uses for the same
job — its own ink, ground, surface and UI font —
rather than defining them as new globals. If the
project has no equivalent, define it locally on
the component's own root so nothing leaks out.
Anything ending -rgb wants three bare numbers,
because the CSS builds rgba() from it.
5. IF YOU CHANGE IT, GO ALL THE WAY. This block is
built for every state its object can really be
in — empty, one, full, refused, undone, pressed
twice, interrupted halfway — and not only the one
the demo opens on. Adapt it and the same standard
holds: work out that list before you write, and
build the whole of it. Never settle for the
minimum that makes the screenshot right. A
component somebody has to come back and finish is
the thing this was written to replace.
Keep the comments. They say why the numbers are what
they are, and they are most of what makes this worth
copying rather than rewriting.
--- Slider.tsx ---
import { useEffect, useRef, useState } from "react";
import { animate, motion, useMotionValue, useTransform } from "framer-motion";
/* ══ Slider ═══════════════════════════════════════════════
A filled bar with a line in it, and one good curve.
THE BAR IS THE VALUE. Not a rail with a bead running along
it — the ink IS how much, the way a glass is how much. You
read the level without looking for the handle, which is the
only thing a slider has to do, and it is why every volume
control worth using is drawn this way.
THE HANDLE IS A LINE, NOT A KNOB. A circle sitting on a bar
is a second object; a line cut into the ink near its end is
part of the bar, so there is one thing on the block instead
of two. It takes the card's own color, so it reads as a gap
in the ink rather than as a chip laid over it.
AND THE ONE MOTION IS THE CURVE. Press anywhere and the ink
RUNS there — four hundred milliseconds on a cubic that
leaves hard and lands soft, so you watch the level travel
instead of finding it already arrived. Drag, and it comes
with you on a much shorter one. A tenth of a second is not
lag: it is the ink taking a beat to catch a finger, and it
The rest — the source and its comments — is what the plan opens.