kopia lustrzana https://github.com/shoelace-style/shoelace
247 wiersze
7.1 KiB
TypeScript
247 wiersze
7.1 KiB
TypeScript
import { html, LitElement } from 'lit';
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import { customElement, property, query, state } from 'lit/decorators.js';
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import { classMap } from 'lit/directives/class-map.js';
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import { styleMap } from 'lit/directives/style-map.js';
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import { unsafeHTML } from 'lit/directives/unsafe-html.js';
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import '~/components/icon/icon';
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import { emit } from '~/internal/event';
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import { clamp } from '~/internal/math';
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import { watch } from '~/internal/watch';
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import styles from './rating.styles';
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/**
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* @since 2.0
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* @status stable
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*
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* @dependency sl-icon
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*
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* @event sl-change - Emitted when the rating's value changes.
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*
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* @csspart base - The component's internal wrapper.
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*
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* @cssproperty --symbol-color - The inactive color for symbols.
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* @cssproperty --symbol-color-active - The active color for symbols.
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* @cssproperty --symbol-size - The size of symbols.
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* @cssproperty --symbol-spacing - The spacing to use around symbols.
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*/
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@customElement('sl-rating')
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export default class SlRating extends LitElement {
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static styles = styles;
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@query('.rating') rating: HTMLElement;
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@state() private hoverValue = 0;
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@state() private isHovering = false;
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/** The current rating. */
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@property({ type: Number }) value = 0;
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/** The highest rating to show. */
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@property({ type: Number }) max = 5;
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/** The minimum increment value allowed by the control. */
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@property({ type: Number }) precision = 1;
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/** Makes the rating readonly. */
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@property({ type: Boolean, reflect: true }) readonly = false;
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/** Disables the rating. */
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@property({ type: Boolean, reflect: true }) disabled = false;
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/** The name of the icon to display as the symbol. */
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@property() getSymbol: (value: number) => string = () => '<sl-icon name="star-fill" library="system"></sl-icon>';
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/** Sets focus on the rating. */
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focus(options?: FocusOptions) {
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this.rating.focus(options);
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}
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/** Removes focus from the rating. */
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blur() {
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this.rating.blur();
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}
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getValueFromMousePosition(event: MouseEvent) {
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return this.getValueFromXCoordinate(event.clientX);
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}
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getValueFromTouchPosition(event: TouchEvent) {
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return this.getValueFromXCoordinate(event.touches[0].clientX);
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}
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getValueFromXCoordinate(coordinate: number) {
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const containerLeft = this.rating.getBoundingClientRect().left;
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const containerWidth = this.rating.getBoundingClientRect().width;
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return clamp(
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this.roundToPrecision(((coordinate - containerLeft) / containerWidth) * this.max, this.precision),
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0,
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this.max
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);
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}
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handleClick(event: MouseEvent) {
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this.setValue(this.getValueFromMousePosition(event));
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}
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setValue(newValue: number) {
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if (this.disabled || this.readonly) {
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return;
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}
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this.value = newValue === this.value ? 0 : newValue;
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this.isHovering = false;
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}
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handleKeyDown(event: KeyboardEvent) {
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if (this.disabled || this.readonly) {
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return;
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}
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if (event.key === 'ArrowLeft') {
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const decrement = event.shiftKey ? 1 : this.precision;
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this.value = Math.max(0, this.value - decrement);
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event.preventDefault();
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}
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if (event.key === 'ArrowRight') {
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const increment = event.shiftKey ? 1 : this.precision;
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this.value = Math.min(this.max, this.value + increment);
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event.preventDefault();
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}
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if (event.key === 'Home') {
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this.value = 0;
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event.preventDefault();
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}
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if (event.key === 'End') {
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this.value = this.max;
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event.preventDefault();
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}
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}
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handleMouseEnter() {
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this.isHovering = true;
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}
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handleMouseMove(event: MouseEvent) {
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this.hoverValue = this.getValueFromMousePosition(event);
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}
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handleMouseLeave() {
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this.isHovering = false;
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}
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handleTouchStart(event: TouchEvent) {
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this.hoverValue = this.getValueFromTouchPosition(event);
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// Prevent scrolling when touch is initiated
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event.preventDefault();
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}
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handleTouchMove(event: TouchEvent) {
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this.isHovering = true;
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this.hoverValue = this.getValueFromTouchPosition(event);
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}
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handleTouchEnd(event: TouchEvent) {
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this.isHovering = false;
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this.setValue(this.hoverValue);
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// Prevent click on mobile devices
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event.preventDefault();
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}
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@watch('value', { waitUntilFirstUpdate: true })
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handleValueChange() {
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emit(this, 'sl-change');
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}
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roundToPrecision(numberToRound: number, precision = 0.5) {
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const multiplier = 1 / precision;
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return Math.ceil(numberToRound * multiplier) / multiplier;
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}
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render() {
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const counter = Array.from(Array(this.max).keys());
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let displayValue = 0;
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if (this.disabled || this.readonly) {
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displayValue = this.value;
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} else {
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displayValue = this.isHovering ? this.hoverValue : this.value;
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}
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return html`
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<div
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part="base"
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class=${classMap({
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rating: true,
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'rating--readonly': this.readonly,
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'rating--disabled': this.disabled
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})}
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aria-disabled=${this.disabled ? 'true' : 'false'}
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aria-readonly=${this.readonly ? 'true' : 'false'}
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aria-valuenow=${this.value}
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aria-valuemin=${0}
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aria-valuemax=${this.max}
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tabindex=${this.disabled ? '-1' : '0'}
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@click=${this.handleClick}
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@keydown=${this.handleKeyDown}
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@mouseenter=${this.handleMouseEnter}
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@touchstart=${this.handleTouchStart}
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@mouseleave=${this.handleMouseLeave}
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@touchend=${this.handleTouchEnd}
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@mousemove=${this.handleMouseMove}
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@touchmove=${this.handleTouchMove}
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>
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<span class="rating__symbols rating__symbols--inactive">
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${counter.map(index => {
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// Users can click the current value to clear the rating. When this happens, we set this.isHovering to
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// false to prevent the hover state from confusing them as they move the mouse out of the control. This
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// extra mouseenter will reinstate it if they happen to mouse over an adjacent symbol.
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return html`
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<span
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class=${classMap({
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rating__symbol: true,
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'rating__symbol--hover': this.isHovering && Math.ceil(displayValue) === index + 1
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})}
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role="presentation"
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@mouseenter=${this.handleMouseEnter}
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>
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${unsafeHTML(this.getSymbol(index + 1))}
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</span>
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`;
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})}
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</span>
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<span class="rating__symbols rating__symbols--indicator">
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${counter.map(index => {
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return html`
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<span
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class=${classMap({
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rating__symbol: true,
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'rating__symbol--hover': this.isHovering && Math.ceil(displayValue) === index + 1
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})}
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style=${styleMap({
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clipPath:
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displayValue > index + 1 ? 'none' : `inset(0 ${100 - ((displayValue - index) / 1) * 100}% 0 0)`
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})}
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role="presentation"
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>
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${unsafeHTML(this.getSymbol(index + 1))}
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</span>
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`;
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})}
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</span>
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</div>
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`;
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}
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}
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declare global {
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interface HTMLElementTagNameMap {
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'sl-rating': SlRating;
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}
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}
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