kopia lustrzana https://github.com/shoelace-style/shoelace
131 wiersze
3.8 KiB
TypeScript
131 wiersze
3.8 KiB
TypeScript
import { html, LitElement } from 'lit';
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import { customElement, property, query } from 'lit/decorators.js';
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import { styleMap } from 'lit/directives/style-map.js';
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import '~/components/icon/icon';
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import { drag } from '~/internal/drag';
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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 './image-comparer.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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* @slot before - The before image, an `<img>` or `<svg>` element.
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* @slot after - The after image, an `<img>` or `<svg>` element.
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* @slot handle-icon - The icon used inside the handle.
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*
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* @event sl-change - Emitted when the position changes.
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*
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* @csspart base - The component's internal wrapper.
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* @csspart before - The container that holds the "before" image.
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* @csspart after - The container that holds the "after" image.
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* @csspart divider - The divider that separates the images.
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* @csspart handle - The handle that the user drags to expose the after image.
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*
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* @cssproperty --divider-width - The width of the dividing line.
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* @cssproperty --handle-size - The size of the compare handle.
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*/
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@customElement('sl-image-comparer')
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export default class SlImageComparer extends LitElement {
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static styles = styles;
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@query('.image-comparer') base: HTMLElement;
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@query('.image-comparer__handle') handle: HTMLElement;
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/** The position of the divider as a percentage. */
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@property({ type: Number, reflect: true }) position = 50;
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handleDrag(event: Event) {
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const { width } = this.base.getBoundingClientRect();
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event.preventDefault();
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drag(this.base, x => {
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this.position = parseFloat(clamp((x / width) * 100, 0, 100).toFixed(2));
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});
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}
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handleKeyDown(event: KeyboardEvent) {
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if (['ArrowLeft', 'ArrowRight', 'Home', 'End'].includes(event.key)) {
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const incr = event.shiftKey ? 10 : 1;
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let newPosition = this.position;
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event.preventDefault();
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if (event.key === 'ArrowLeft') {
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newPosition -= incr;
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}
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if (event.key === 'ArrowRight') {
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newPosition += incr;
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}
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if (event.key === 'Home') {
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newPosition = 0;
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}
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if (event.key === 'End') {
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newPosition = 100;
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}
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newPosition = clamp(newPosition, 0, 100);
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this.position = newPosition;
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}
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}
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@watch('position', { waitUntilFirstUpdate: true })
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handlePositionChange() {
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emit(this, 'sl-change');
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}
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render() {
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return html`
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<div part="base" id="image-comparer" class="image-comparer" @keydown=${this.handleKeyDown}>
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<div class="image-comparer__image">
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<div part="before" class="image-comparer__before">
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<slot name="before"></slot>
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</div>
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<div
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part="after"
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class="image-comparer__after"
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style=${styleMap({ clipPath: `inset(0 ${100 - this.position}% 0 0)` })}
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>
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<slot name="after"></slot>
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</div>
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</div>
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<div
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part="divider"
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class="image-comparer__divider"
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style=${styleMap({ left: `${this.position}%` })}
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@mousedown=${this.handleDrag}
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@touchstart=${this.handleDrag}
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>
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<div
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part="handle"
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class="image-comparer__handle"
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role="scrollbar"
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aria-valuenow=${this.position}
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aria-valuemin="0"
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aria-valuemax="100"
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aria-controls="image-comparer"
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tabindex="0"
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>
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<slot name="handle-icon">
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<sl-icon class="image-comparer__handle-icon" name="grip-vertical" library="system"></sl-icon>
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</slot>
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</div>
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</div>
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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-image-comparer': SlImageComparer;
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}
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}
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