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color-slider.js
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color-slider.js
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// See https://bugs.webkit.org/show_bug.cgi?id=242740
import ColorJS from "../common/color.js";
const Color = await ColorJS;
import NudeElement from "../../node_modules/nude-element/src/Element.js";
import { getStep } from "../common/util.js";
let supports = {
inSpace: CSS?.supports("background", "linear-gradient(in oklab, red, tan)"),
fieldSizing: CSS?.supports("field-sizing", "content"),
};
const Self = class ColorSlider extends NudeElement {
static tagName = "color-slider";
static Color = Color;
constructor () {
super();
this.attachShadow({mode: "open"});
let styleURL = new URL(`./${this.constructor.tagName}.css`, import.meta.url);
this.shadowRoot.innerHTML = `
<style>@import url("${ styleURL }")</style>
<input type="range" class="color-slider" part="slider" min="0" max="1" step="0.01" />
<slot name="tooltip" class="slider-tooltip">
<input type="number" part="spinner" min="0" max="1" step="0.01" />
</slot>
<slot></slot>
`;
this._el = {
slider: this.shadowRoot.querySelector(".color-slider"),
spinner: this.shadowRoot.querySelector("input[type=number]"),
};
}
connectedCallback() {
super.connectedCallback?.();
this._el.slider.addEventListener("input", this);
this._el.spinner.addEventListener("input", this);
}
disconnectedCallback() {
this._el.slider.removeEventListener("input", this);
this._el.spinner.removeEventListener("input", this);
}
handleEvent (event) {
if (event.type === "input") {
if (this.tooltip === "progress" && event.target === this._el.spinner) {
// Convert to value
let value = this._el.spinner.value;
this.value = this.valueAt(value / 100);
}
else {
this.value = event.target.value;
}
this.dispatchEvent(new event.constructor(event.type, {...event}));
}
}
propChangedCallback ({name, prop, detail: change}) {
if (["min", "max", "step", "value", "defaultValue"].includes(name)) {
prop.applyChange(this._el.slider, change);
let value = change.value;
if (this.tooltip === "progress") {
if (name === "value" || name === "defaultValue") {
value = +(this.progress * 100).toPrecision(4);
}
else {
// Spinner values when tooltip is "progress"
value = ({ min: 1, max: 100, step: 1 })[name];
}
}
prop.applyChange(this._el.spinner, {...change, value});
}
if (name === "stops") {
// FIXME will fail if there are none values
let stops = this.stops;
let supported = stops.every(color => CSS.supports("color", color));
// CSS does not support (yet?) a raw hue interpolation,
// so we need to fake it with tessellateStops() in cases of polar space and far-apart stops.
let farApart = false;
let space = this.space;
if (space.isPolar) {
for (let i = 1; i < stops.length; i++) {
// Even though space is polar, color stops might be in non-polar spaces
let first = stops[i - 1].to(space);
let second = stops[i].to(space);
let firstHue = first.get("h");
let secondHue = second.get("h");
if (Math.abs(firstHue - secondHue) >= 180) {
farApart = true;
break;
}
}
}
if (!supported || farApart) {
stops = this.tessellateStops({ steps: 3 });
}
stops = stops.map(color => color.display()).join(", ");
this.style.setProperty("--slider-color-stops", stops);
}
else if (name === "space" && supports.inSpace) {
let space = this.space;
let spaceId = space.id;
let supported = CSS.supports("background", `linear-gradient(in ${ spaceId }, red, tan)`);
if (!supported) {
spaceId = this.space.isPolar ? "oklch" : "oklab";
}
this.style.setProperty("--color-space", spaceId);
}
else if (name === "color" || name === "defaultColor") {
let color = this.color;
if (color) {
let displayedColor = color.display();
this.style.setProperty("--color", displayedColor);
}
}
else if (name === "value" || name === "min" || name === "max") {
this.style.setProperty("--progress", this.progress);
if (name === "value" && !supports.fieldSizing) {
let valueStr = this.value + "";
this._el.spinner.style.setProperty("--value-length", valueStr.length);
}
}
else if (name === "tooltip") {
if (change.value !== undefined) {
let values = this;
if (change.value === "progress") {
values = {
min: 1, max: 100, step: 1,
value: +(this.progress * 100).toPrecision(4),
};
}
["min", "max", "step", "value"].forEach(name => {
this._el.spinner[name] = values[name];
});
}
}
}
tessellateStops (options = {}) {
let stops = this.stops;
let tessellated = [];
for (let i=1; i<stops.length; i++) {
let start = stops[i - 1];
let end = stops[i];
let steps = start.steps(end, { space: this.space, ...options });
tessellated.push(...steps);
if (i < stops.length - 1) {
tessellated.pop();
}
}
return tessellated;
}
get progress () {
return this.progressAt(this.value);
}
progressAt (value) {
return (value - this.min) / (this.max - this.min);
}
valueAt (progress) {
return this.min + progress * (this.max - this.min);
}
colorAt (value) {
let progress = this.progressAt(value);
return this.colorAtProgress(progress);
}
colorAtProgress (progress) {
let bands = this.scales?.length;
if (bands <= 0) {
return null;
}
// FIXME the values outside of [0, 1] should be scaled
if (progress >= 1) {
return this.scales.at(-1)(progress);
}
else if (progress <= 0) {
return this.scales[0](progress);
}
let band = 1 / bands;
let scaleIndex = Math.max(0, Math.min(Math.floor(progress / band), bands - 1));
let scale = this.scales[scaleIndex];
let color = scale((progress % band) * bands);
return color;
}
static props = {
min: {
type: Number,
default: 0,
},
max: {
type: Number,
default: 1,
},
step: {
type: Number,
default () {
return getStep(this.max, this.min, { minSteps: 100 });
},
},
stops: {
type: {
is: Array,
values: Color,
},
default: el => []
},
defaultValue: {
type: Number,
default () {
return (this.min + this.max) / 2;
},
reflect: {
from: "value",
},
},
value: {
type: Number,
defaultProp: "defaultValue",
reflect: false,
},
space: {
default () {
return this.stops[0]?.space ?? "oklab";
},
parse (value) {
if (value instanceof Color.Space || value === null || value === undefined) {
return value;
}
value += "";
return Color.Space.get(value);
},
stringify (value) {
return value?.id;
},
},
color: {
type: Color,
get () {
return this.colorAt(this.value);
},
dependencies: ["scales", "value"],
},
scales: {
get () {
let stops = this.stops;
let scales = [];
for (let i=1; i<stops.length; i++) {
let start = stops[i - 1];
let end = stops[i];
let range = start.range(end, { space: this.space });
scales.push(range);
}
return scales;
},
dependencies: ["stops", "space"],
},
tooltip: {
type: String,
},
};
static events = {
change: {
from () {
return this._el.slider;
}
},
valuechange: {
propchange: "value",
},
colorchange: {
propchange: "color",
},
};
static formAssociated = {
like: el => el._el.slider,
role: "slider",
valueProp: "value",
changeEvent: "valuechange",
};
}
customElements.define(Self.tagName, Self);
export default Self;