2022-08-05 13:17:58 +00:00
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import { arrow, autoUpdate, computePosition, flip, offset, shift, size } from '@floating-ui/dom';
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import { LitElement, html } from 'lit';
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import { customElement, property, query } from 'lit/decorators.js';
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import { classMap } from 'lit/directives/class-map.js';
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import { watch } from '../../internal/watch';
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import styles from './popup.styles';
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import type { CSSResultGroup } from 'lit';
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/**
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* @since 2.0
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* @status experimental
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*
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* @slot - The popup's content.
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* @slot anchor - The element the popup will be anchored to.
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*
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* @csspart arrow - The arrow's container. Avoid setting `top|bottom|left|right` properties, as these values are
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* assigned dynamically as the popup moves. This is most useful for applying a background color to match the popup, and
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* maybe a border or box shadow.
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* @csspart popup - The popup's container. Useful for setting a background color, box shadow, etc.
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*
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* @cssproperty [--arrow-size=4px] - The size of the arrow. Note that an arrow won't be shown unless the `arrow` attribute is used.
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* @cssproperty [--arrow-color=var(--sl-color-neutral-0)] - The color of the arrow.
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*/
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@customElement('sl-popup')
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export default class SlPopup extends LitElement {
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static styles: CSSResultGroup = styles;
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@query('.popup') popupEl: HTMLElement;
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@query('.popup__arrow') arrowEl: HTMLElement;
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private anchor: HTMLElement | null;
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private cleanup: ReturnType<typeof autoUpdate> | undefined;
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/**
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* Activates the positioning logic and shows the popup. When this attribute is removed, the positioning logic is torn
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* down and the popup will be hidden.
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*/
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@property({ type: Boolean, reflect: true }) active = false;
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/**
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* The preferred placement of the popup. Note that the actual placement will vary as configured to keep the
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* panel inside of the viewport.
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*/
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@property({ reflect: true }) placement:
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| 'top'
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| 'top-start'
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| 'top-end'
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| 'bottom'
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| 'bottom-start'
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| 'bottom-end'
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| 'right'
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| 'right-start'
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| 'right-end'
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| 'left'
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| 'left-start'
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| 'left-end' = 'top';
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/**
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* Determines how the popup is positioned. The `absolute` strategy works well in most cases, but if
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* overflow is clipped, using a `fixed` position strategy can often workaround it.
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*/
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@property({ reflect: true }) strategy: 'absolute' | 'fixed' = 'absolute';
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/** The distance in pixels from which to offset the panel away from its anchor. */
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@property({ type: Number }) distance = 0;
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/** The distance in pixels from which to offset the panel along its anchor. */
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@property({ type: Number }) skidding = 0;
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/**
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* Attaches an arrow to the popup. The arrow's size and color can be customized using the `--arrow-size` and
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* `--arrow-color` custom properties. For additional customizations, you can also target the arrow using
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* `::part(arrow) in your stylesheet.
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*/
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@property({ type: Boolean }) arrow = false;
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/**
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* The amount of padding between the arrow and the edges of the popup. If the popup has a border-radius, for example,
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* this will prevent it from overflowing the corners.
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*/
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@property({ type: Number }) arrowPadding = 10;
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/**
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* When set, placement of the popup will flip to the opposite site to keep it in view. You can use
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* `flipFallbackPlacement` to further configure how the fallback placement is determined.
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*/
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@property({ type: Boolean }) flip = false;
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/**
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* If the preferred placement doesn't fit, popup will be tested in these fallback placements until one fits. Must be a
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* string of any number of placements separated by a space, e.g. "top bottom left". If no placement fits, the flip
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* fallback strategy will be used instead.
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* */
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@property({
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attribute: 'flip-fallback-placement',
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converter: {
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fromAttribute: (value: string) => {
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console.log(value);
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return String(value)
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.split(' ')
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.map(p => p.trim());
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},
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toAttribute: (value: []) => {
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console.log(value);
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return value.join(' ');
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}
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}
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})
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flipFallbackPlacement = '';
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/**
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* When neither the preferred placement nor the fallback placements fit, this value will be used to determine whether
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* the popup should be positioned as it was initially preferred or using the best available fit based on available
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* space.
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*/
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@property({ attribute: 'flip-fallback-strategy' }) flipFallbackStrategy: 'bestFit' | 'initialPlacement' =
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'initialPlacement';
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/**
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* The flip boundary describes clipping element(s) that overflow will be checked relative to when flipping. By
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* default, the boundary includes overflow ancestors that will cause the element to be clipped. If needed, you can
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* change the boundary by passing a reference to one or more elements to this property.
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*/
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@property({
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attribute: 'flip-boundary',
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type: Object
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})
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flipBoundary: Element | Element[];
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/** The amount of padding, in pixels, when the flip behavior will occur. */
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@property({
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attribute: 'flip-padding',
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type: Number
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})
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flipPadding = 0;
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/** Moves the popup along the axis to keep it in view when clipped. */
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@property({ type: Boolean }) shift = false;
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/**
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* The shift boundary describes clipping element(s) that overflow will be checked relative to when shifting. By
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* default, the boundary includes overflow ancestors that will cause the element to be clipped. If needed, you can
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* change the boundary by passing a reference to one or more elements to this property.
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*/
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@property({
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attribute: 'shift-boundary',
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type: Object
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})
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shiftBoundary: Element | Element[];
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/** The amount of padding, in pixels, when the shift behavior will occur. */
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@property({
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attribute: 'shift-padding',
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type: Number
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})
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shiftPadding = 0;
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/**
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* When set, this will cause the popup to be resized to prevent it from overflowing. This is used as a last resort
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* and will only be attempted after flipping and shifting, if those options are enabled.
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*/
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@property({ type: Boolean }) resize = false;
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/**
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* The resize boundary describes clipping element(s) that overflow will be checked relative to when resizing. By
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* default, the boundary includes overflow ancestors that will cause the element to be clipped. If needed, you can
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* change the boundary by passing a reference to one or more elements to this property.
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*/
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@property({
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attribute: 'resize-boundary',
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type: Object
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})
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resizeBoundary: Element | Element[];
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/** The amount of padding, in pixels, when the resize behavior will occur. */
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@property({
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attribute: 'resize-padding',
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type: Number
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})
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resizePadding = 0;
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async connectedCallback() {
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super.connectedCallback();
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// Start the positioner after the first update
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await this.updateComplete;
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this.start();
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}
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disconnectedCallback() {
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this.stop();
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}
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async handleAnchorSlotChange() {
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await this.stop();
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this.anchor = this.querySelector<HTMLElement>('[slot="anchor"]');
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if (!this.anchor) {
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throw new Error('Invalid anchor element: no child with slot="anchor" was found.');
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}
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this.start();
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}
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private start() {
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// We can't start the positioner without an anchor
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if (!this.anchor) {
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return;
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}
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this.cleanup = autoUpdate(this.anchor, this.popupEl, () => {
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this.reposition();
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});
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}
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private async stop(): Promise<void> {
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return new Promise(resolve => {
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if (this.cleanup) {
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this.cleanup();
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this.cleanup = undefined;
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requestAnimationFrame(() => resolve());
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} else {
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resolve();
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}
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});
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}
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@watch('active', { waitUntilFirstUpdate: true })
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handleActiveChange() {
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if (this.active) {
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this.start();
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} else {
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this.stop();
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}
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}
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@watch('arrow')
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@watch('boundary')
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@watch('distance')
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@watch('flip')
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@watch('flipFallbackPlacement')
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@watch('flipFallbackStrategy')
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@watch('placement')
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@watch('shift')
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@watch('resize')
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@watch('skidding')
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@watch('strategy')
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async handlePositionChange() {
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if (this.hasUpdated && this.active) {
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await this.updateComplete;
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this.reposition();
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}
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}
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/** Recalculate and repositions the popup. */
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reposition() {
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if (!this.anchor) {
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throw new Error('Invalid anchor element: no child with slot="anchor" was found.');
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}
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// Nothing to do if the popup is inactive
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if (!this.active) {
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return;
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}
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//
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// NOTE: Floating UI middlewares are order dependent: https://floating-ui.com/docs/middleware
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//
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const middleware = [
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// The offset middleware goes first
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offset({ mainAxis: this.distance, crossAxis: this.skidding })
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];
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// Then we flip, as needed
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if (this.flip) {
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middleware.push(
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flip({
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boundary: this.flipBoundary,
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// @ts-expect-error - We're converting a string attribute to an array here
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fallbackPlacement: this.flipFallbackPlacement,
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fallbackStrategy: this.flipFallbackStrategy,
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padding: this.flipPadding
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})
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);
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}
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// Then we shift, as needed
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if (this.shift) {
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middleware.push(
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shift({
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boundary: this.shiftBoundary,
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padding: this.shiftPadding
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})
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);
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}
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// Then, we adjust the size as needed
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if (this.resize) {
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middleware.push(
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size({
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boundary: this.resizeBoundary,
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padding: this.resizePadding,
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apply: ({ availableWidth, availableHeight }) => {
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// Ensure the panel stays within the viewport when we have lots of menu items
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Object.assign(this.popupEl.style, {
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maxWidth: `${availableWidth}px`,
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maxHeight: `${availableHeight}px`
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});
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}
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})
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);
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} else {
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// Unset max-width/max-height when we're no longer using this middleware
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Object.assign(this.popupEl.style, { maxWidth: '', maxHeight: '' });
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}
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// Finally, we add an arrow
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if (this.arrow) {
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middleware.push(
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arrow({
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element: this.arrowEl,
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padding: this.arrowPadding
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})
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);
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}
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computePosition(this.anchor, this.popupEl, {
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placement: this.placement,
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middleware,
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strategy: this.strategy
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}).then(({ x, y, middlewareData, placement }) => {
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const staticSide = { top: 'bottom', right: 'left', bottom: 'top', left: 'right' }[placement.split('-')[0]]!;
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Object.assign(this.popupEl.style, {
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left: `${x}px`,
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top: `${y}px`
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});
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if (this.arrow) {
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const arrowX = middlewareData.arrow?.x;
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const arrowY = middlewareData.arrow?.y;
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Object.assign(this.arrowEl.style, {
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left: typeof arrowX === 'number' ? `${arrowX}px` : '',
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top: typeof arrowY === 'number' ? `${arrowY}px` : '',
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right: '',
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bottom: '',
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[staticSide]: 'calc(var(--arrow-size) * -1)'
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});
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}
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});
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}
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render() {
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return html`
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<slot name="anchor" @slotchange=${this.handleAnchorSlotChange}></slot>
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<div
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part="popup"
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class=${classMap({
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popup: true,
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'popup--active': this.active,
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'popup--fixed': this.strategy === 'fixed',
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'popup--has-arrow': this.arrow
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})}
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data-placement=${this.placement}
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>
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<slot></slot>
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${this.arrow ? html`<div part="arrow" class="popup__arrow" role="presentation"></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-popup': SlPopup;
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|
|
|
}
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|
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|
}
|