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OverlayController.js
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OverlayController.js
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import '@lion/core/src/differentKeyEventNamesShimIE.js';
import { overlays } from './overlays.js';
import { containFocus } from './utils/contain-focus.js';
import './utils/typedef.js';
async function preloadPopper() {
return import('popper.js/dist/esm/popper.min.js');
}
const GLOBAL_OVERLAYS_CONTAINER_CLASS = 'global-overlays__overlay-container';
const GLOBAL_OVERLAYS_CLASS = 'global-overlays__overlay';
const supportsCSSTypedObject = window.CSS && CSS.number;
/**
* @desc OverlayController is the fundament for every single type of overlay. With the right
* configuration, it can be used to build (modal) dialogs, tooltips, dropdowns, popovers,
* bottom/top/left/right sheets etc.
*
* ### About contentNode, contentWrapperNode and renderTarget.
*
* #### contentNode
* Node containing actual overlay contents.
* It will not be touched by the OverlayController, it will only set attributes needed
* for accessibility.
*
* #### contentWrapperNode
* The 'positioning' element.
* For local overlays, this node will be provided to Popper and all
* inline positioning styles will be added here. It will also act as the container of an arrow
* element (the arrow needs to be a sibling of contentNode for Popper to work correctly).
* When projecting a contentNode from a shadowRoot, it is essential to have the wrapper in
* shadow dom, so that contentNode can be styled via `::slotted` from the shadow root.
* The Popper arrow can then be styled from that same shadow root as well.
* For global overlays, the contentWrapperNode will be appended to the globalRootNode structure.
*
* #### renderTarget
* Usually the parent node of contentWrapperNode that either exists locally or globally.
* When a responsive scenario is created (in which we switch from global to local or vice versa)
* we need to know where we should reappend contentWrapperNode (or contentNode in case it's projected)
*
* So a regular flow can be summarized as follows:
* 1. Application Developer spawns an OverlayController with a contentNode reference
* 2. OverlayController will create a contentWrapperNode around contentNode (or consumes when provided)
* 3. contentWrapperNode will be appended to the right renderTarget
*
* There are subtle differences depending on the following factors:
* - whether in global/local placement mode
* - whether contentNode projected
* - whether an arrow is provided
*
* This leads to the following possible combinations:
* - [l1]. local + no content projection + no arrow
* - [l2]. local + content projection + no arrow
* - [l3]. local + no content projection + arrow
* - [l4]. local + content projection + arrow
* - [g1]. global
*
* #### html structure for a content projected node
* <div id="contentWrapperNode">
* <slot name="contentNode"></slot>
* <div x-arrow></div>
* </div>
*
* Structure above depicts [l4]
* So in case of [l1] and [l3], the <slot> element would be a regular element
* In case of [l1] and [l2], there would be no arrow.
* Note that a contentWrapperNode should be provided for [l2], [l3] and [l4]
* In case of a global overlay ([g1]), it's enough to provide just the contentNode.
* In case of a local overlay or a responsive overlay switching from placementMode, one should
* always configure as if it was a local overlay.
*
*/
export class OverlayController {
/**
* @constructor
* @param {OverlayConfig} config initial config. Will be remembered as shared config
* when `.updateConfig()` is called.
*/
constructor(config = {}, manager = overlays) {
this.__fakeExtendsEventTarget();
this.manager = manager;
this.__sharedConfig = config;
/** @type {OverlayConfig} */
this._defaultConfig = {
placementMode: null,
contentNode: config.contentNode,
contentWrapperNode: config.contentWrapperNode,
invokerNode: config.invokerNode,
backdropNode: config.backdropNode,
referenceNode: null,
elementToFocusAfterHide: config.invokerNode,
inheritsReferenceWidth: 'none',
hasBackdrop: false,
isBlocking: false,
preventsScroll: false,
trapsKeyboardFocus: false,
hidesOnEsc: false,
hidesOnOutsideEsc: false,
hidesOnOutsideClick: false,
isTooltip: false,
handlesUserInteraction: false,
handlesAccessibility: false,
popperConfig: {
placement: 'top',
positionFixed: false,
modifiers: {
keepTogether: {
enabled: false,
},
preventOverflow: {
enabled: true,
boundariesElement: 'viewport',
padding: 8, // viewport-margin for shifting/sliding
},
flip: {
boundariesElement: 'viewport',
padding: 16, // viewport-margin for flipping
},
offset: {
enabled: true,
offset: `0, 8px`, // horizontal and vertical margin (distance between popper and referenceElement)
},
arrow: {
enabled: false,
},
},
},
viewportConfig: {
placement: 'center',
},
};
this.manager.add(this);
this._contentId = `overlay-content--${Math.random().toString(36).substr(2, 10)}`;
if (this._defaultConfig.contentNode) {
if (!this._defaultConfig.contentNode.isConnected) {
throw new Error(
'[OverlayController] Could not find a render target, since the provided contentNode is not connected to the DOM. Make sure that it is connected, e.g. by doing "document.body.appendChild(contentNode)", before passing it on.',
);
}
this.__isContentNodeProjected = Boolean(this._defaultConfig.contentNode.assignedSlot);
}
this.updateConfig(config);
this.__hasActiveTrapsKeyboardFocus = false;
this.__hasActiveBackdrop = true;
}
get invoker() {
return this.invokerNode;
}
get content() {
return this._contentWrapperNode;
}
/**
* @desc Usually the parent node of contentWrapperNode that either exists locally or globally.
* When a responsive scenario is created (in which we switch from global to local or vice versa)
* we need to know where we should reappend contentWrapperNode (or contentNode in case it's
* projected)
* @type {HTMLElement}
*/
get _renderTarget() {
/** config [g1] */
if (this.placementMode === 'global') {
return this.manager.globalRootNode;
}
/** config [l2] or [l4] */
if (this.__isContentNodeProjected) {
return this.__originalContentParent.getRootNode().host;
}
/** config [l1] or [l3] */
return this.__originalContentParent;
}
/**
* @desc The element our local overlay will be positioned relative to.
* @type {HTMLElement}
*/
get _referenceNode() {
return this.referenceNode || this.invokerNode;
}
set elevation(value) {
if (this._contentWrapperNode) {
this._contentWrapperNode.style.zIndex = value;
}
if (this.backdropNode) {
this.backdropNode.style.zIndex = value;
}
}
get elevation() {
return this._contentWrapperNode.zIndex;
}
/**
* @desc Allows to dynamically change the overlay configuration. Needed in case the
* presentation of the overlay changes depending on screen size.
* Note that this method is the only allowed way to update a configuration of an
* OverlayController instance.
* @param { OverlayConfig } cfgToAdd
*/
updateConfig(cfgToAdd) {
// Teardown all previous configs
this._handleFeatures({ phase: 'teardown' });
this.__prevConfig = this.config || {};
this.config = {
...this._defaultConfig, // our basic ingredients
...this.__sharedConfig, // the initial configured overlayController
...cfgToAdd, // the added config
popperConfig: {
...(this._defaultConfig.popperConfig || {}),
...(this.__sharedConfig.popperConfig || {}),
...(cfgToAdd.popperConfig || {}),
modifiers: {
...((this._defaultConfig.popperConfig && this._defaultConfig.popperConfig.modifiers) ||
{}),
...((this.__sharedConfig.popperConfig && this.__sharedConfig.popperConfig.modifiers) ||
{}),
...((cfgToAdd.popperConfig && cfgToAdd.popperConfig.modifiers) || {}),
},
},
};
this.__validateConfiguration(this.config);
Object.assign(this, this.config);
this._init({ cfgToAdd });
}
// eslint-disable-next-line class-methods-use-this
__validateConfiguration(newConfig) {
if (!newConfig.placementMode) {
throw new Error('You need to provide a .placementMode ("global"|"local")');
}
if (!['global', 'local'].includes(newConfig.placementMode)) {
throw new Error(
`"${newConfig.placementMode}" is not a valid .placementMode, use ("global"|"local")`,
);
}
if (!newConfig.contentNode) {
throw new Error('You need to provide a .contentNode');
}
if (this.__isContentNodeProjected && !newConfig.contentWrapperNode) {
throw new Error('You need to provide a .contentWrapperNode when .contentNode is projected');
}
// if (newConfig.popperConfig.modifiers.arrow && !newConfig.contentWrapperNode) {
// throw new Error('You need to provide a .contentWrapperNode when Popper arrow is enabled');
// }
}
async _init({ cfgToAdd }) {
this.__initcontentWrapperNode({ cfgToAdd });
this.__initConnectionTarget();
if (this.handlesAccessibility) {
this.__initAccessibility({ cfgToAdd });
}
if (this.placementMode === 'local') {
// Lazily load Popper if not done yet
if (!this.constructor.popperModule) {
this.constructor.popperModule = preloadPopper();
}
}
this._handleFeatures({ phase: 'init' });
}
__initConnectionTarget() {
// Now, add our node to the right place in dom (renderTarget)
if (this._contentWrapperNode !== this.__prevConfig._contentWrapperNode) {
if (this.config.placementMode === 'global' || !this.__isContentNodeProjected) {
this._contentWrapperNode.appendChild(this.contentNode);
}
}
if (this.__isContentNodeProjected && this.placementMode === 'local') {
// We add the contentNode in its slot, so that it will be projected by contentWrapperNode
this._renderTarget.appendChild(this.contentNode);
} else {
const isInsideRenderTarget = this._renderTarget === this._contentWrapperNode.parentNode;
if (!isInsideRenderTarget) {
// contentWrapperNode becomes the direct (non projected) parent of contentNode
this._renderTarget.appendChild(this._contentWrapperNode);
}
}
}
/**
* @desc Cleanup ._contentWrapperNode. We do this, because creating a fresh wrapper
* can lead to problems with event listeners...
*/
__initcontentWrapperNode({ cfgToAdd }) {
if (this.config.contentWrapperNode && this.placementMode === 'local') {
/** config [l2],[l3],[l4] */
this._contentWrapperNode = this.config.contentWrapperNode;
} else {
/** config [l1],[g1] */
this._contentWrapperNode = document.createElement('div');
}
this._contentWrapperNode.style.cssText = null;
this._contentWrapperNode.style.display = 'none';
if (getComputedStyle(this.contentNode).position === 'absolute') {
// Having a _contWrapperNode and a contentNode with 'position:absolute' results in
// computed height of 0...
this.contentNode.style.position = 'static';
}
if (this.__isContentNodeProjected && this._contentWrapperNode.isConnected) {
// We need to keep track of the original local context.
/** config [l2], [l4] */
this.__originalContentParent = this._contentWrapperNode.parentNode;
} else if (cfgToAdd.contentNode && cfgToAdd.contentNode.isConnected) {
// We need to keep track of the original local context.
/** config [l1], [l3], [g1] */
this.__originalContentParent = this.contentNode.parentNode;
}
}
/**
* @desc Display local overlays on top of elements with no z-index that appear later in the DOM
*/
_handleZIndex({ phase }) {
if (this.placementMode !== 'local') {
return;
}
if (phase === 'setup') {
const zIndexNumber = Number(getComputedStyle(this.contentNode).zIndex);
if (zIndexNumber < 1 || Number.isNaN(zIndexNumber)) {
this._contentWrapperNode.style.zIndex = 1;
}
}
}
__initAccessibility() {
// TODO: remove a11y attributes on teardown
if (!this.contentNode.id) {
this.contentNode.setAttribute('id', this._contentId);
}
if (this.isTooltip) {
if (this.invokerNode) {
this.invokerNode.setAttribute(
this.invokerRelation === 'label' ? 'aria-labelledby' : 'aria-describedby',
this._contentId,
);
}
this.contentNode.setAttribute('role', 'tooltip');
} else {
if (this.invokerNode) {
this.invokerNode.setAttribute('aria-expanded', this.isShown);
}
if (!this.contentNode.role) {
this.contentNode.setAttribute('role', 'dialog');
}
}
}
get isShown() {
return Boolean(this._contentWrapperNode.style.display !== 'none');
}
/**
* @event before-show right before the overlay shows. Used for animations and switching overlays
* @event show right after the overlay is shown
* @param {HTMLElement} elementToFocusAfterHide
*/
async show(elementToFocusAfterHide = this.elementToFocusAfterHide) {
if (this.manager) {
this.manager.show(this);
}
if (this.isShown) {
return;
}
const event = new CustomEvent('before-show', { cancelable: true });
this.dispatchEvent(event);
if (!event.defaultPrevented) {
this._contentWrapperNode.style.display = '';
this._keepBodySize({ phase: 'before-show' });
await this._handleFeatures({ phase: 'show' });
this._keepBodySize({ phase: 'show' });
await this._handlePosition({ phase: 'show' });
this.elementToFocusAfterHide = elementToFocusAfterHide;
this.dispatchEvent(new Event('show'));
}
}
async _handlePosition({ phase }) {
if (this.placementMode === 'global') {
const addOrRemove = phase === 'show' ? 'add' : 'remove';
const placementClass = `${GLOBAL_OVERLAYS_CONTAINER_CLASS}--${this.viewportConfig.placement}`;
this._contentWrapperNode.classList[addOrRemove](GLOBAL_OVERLAYS_CONTAINER_CLASS);
this._contentWrapperNode.classList[addOrRemove](placementClass);
this.contentNode.classList[addOrRemove](GLOBAL_OVERLAYS_CLASS);
} else if (this.placementMode === 'local' && phase === 'show') {
/**
* Popper is weird about properly positioning the popper element when it is recreated so
* we just recreate the popper instance to make it behave like it should.
* Probably related to this issue: https://github.com/FezVrasta/popper.js/issues/796
* calling just the .update() function on the popper instance sadly does not resolve this.
* This is however necessary for initial placement.
*/
await this.__createPopperInstance();
this._popper.update();
}
}
_keepBodySize({ phase }) {
switch (phase) {
case 'before-show':
this.__bodyClientWidth = document.body.clientWidth;
this.__bodyClientHeight = document.body.clientHeight;
this.__bodyMarginRight = 0;
this.__bodyMarginBottom = 0;
break;
case 'show': {
if (supportsCSSTypedObject) {
this.__bodyMarginRight = document.body.computedStyleMap().get('margin-right').value;
this.__bodyMarginBottom = document.body.computedStyleMap().get('margin-bottom').value;
} else if (window.getComputedStyle) {
const bodyStyle = window.getComputedStyle(document.body);
if (bodyStyle) {
this.__bodyMarginRight = parseInt(bodyStyle.getPropertyValue('margin-right'), 10);
this.__bodyMarginBottom = parseInt(bodyStyle.getPropertyValue('margin-bottom'), 10);
}
}
const scrollbarWidth = document.body.clientWidth - this.__bodyClientWidth;
const scrollbarHeight = document.body.clientHeight - this.__bodyClientHeight;
const newMarginRight = this.__bodyMarginRight + scrollbarWidth;
const newMarginBottom = this.__bodyMarginBottom + scrollbarHeight;
if (supportsCSSTypedObject) {
document.body.attributeStyleMap.set('margin-right', CSS.px(newMarginRight));
document.body.attributeStyleMap.set('margin-bottom', CSS.px(newMarginBottom));
} else {
document.body.style.marginRight = `${newMarginRight}px`;
document.body.style.marginBottom = `${newMarginBottom}px`;
}
break;
}
case 'hide':
if (supportsCSSTypedObject) {
document.body.attributeStyleMap.set('margin-right', CSS.px(this.__bodyMarginRight));
document.body.attributeStyleMap.set('margin-bottom', CSS.px(this.__bodyMarginBottom));
} else {
document.body.style.marginRight = `${this.__bodyMarginRight}px`;
document.body.style.marginBottom = `${this.__bodyMarginBottom}px`;
}
break;
/* no default */
}
}
/**
* @event before-hide right before the overlay hides. Used for animations and switching overlays
* @event hide right after the overlay is hidden
*/
async hide() {
if (this.manager) {
this.manager.hide(this);
}
if (!this.isShown) {
return;
}
const event = new CustomEvent('before-hide', { cancelable: true });
this.dispatchEvent(event);
if (!event.defaultPrevented) {
// await this.transitionHide({ backdropNode: this.backdropNode, conentNode: this.contentNode });
this._contentWrapperNode.style.display = 'none';
this._handleFeatures({ phase: 'hide' });
this._keepBodySize({ phase: 'hide' });
this.dispatchEvent(new Event('hide'));
this._restoreFocus();
}
}
// eslint-disable-next-line class-methods-use-this, no-empty-function, no-unused-vars
async transitionHide({ backdropNode, contentNode }) {}
_restoreFocus() {
// We only are allowed to move focus if we (still) 'own' it.
// Otherwise we assume the 'outside world' has, purposefully, taken over
// if (this._contentWrapperNode.activeElement) {
if (this.elementToFocusAfterHide) {
this.elementToFocusAfterHide.focus();
}
// }
}
async toggle() {
return this.isShown ? this.hide() : this.show();
}
/**
* @desc All features are handled here. Every feature is set up on show
* and torn
* @param {object} config
* @param {'init'|'show'|'hide'|'teardown'} config.phase
*/
async _handleFeatures({ phase }) {
this._handleZIndex({ phase });
if (this.preventsScroll) {
this._handlePreventsScroll({ phase });
}
if (this.isBlocking) {
this._handleBlocking({ phase });
}
if (this.hasBackdrop) {
this._handleBackdrop({ phase });
}
if (this.trapsKeyboardFocus) {
this._handleTrapsKeyboardFocus({ phase });
}
if (this.hidesOnEsc) {
this._handleHidesOnEsc({ phase });
}
if (this.hidesOnOutsideEsc) {
this._handleHidesOnOutsideEsc({ phase });
}
if (this.hidesOnOutsideClick) {
this._handleHidesOnOutsideClick({ phase });
}
if (this.handlesAccessibility) {
this._handleAccessibility({ phase });
}
if (this.inheritsReferenceWidth) {
this._handleInheritsReferenceWidth();
}
}
_handlePreventsScroll({ phase }) {
switch (phase) {
case 'show':
this.manager.requestToPreventScroll();
break;
case 'hide':
this.manager.requestToEnableScroll();
break;
/* no default */
}
}
_handleBlocking({ phase }) {
switch (phase) {
case 'show':
this.manager.requestToShowOnly(this);
break;
case 'hide':
this.manager.retractRequestToShowOnly(this);
break;
/* no default */
}
}
get hasActiveBackdrop() {
return this.__hasActiveBackdrop;
}
/**
* @desc Sets up backdrop on the given overlay. If there was a backdrop on another element
* it is removed. Otherwise this is the first time displaying a backdrop, so a fade-in
* animation is played.
*/
_handleBackdrop({ animation = true, phase }) {
if (this.placementMode === 'local') {
switch (phase) {
case 'init':
if (!this.backdropNode) {
this.backdropNode = document.createElement('div');
this.backdropNode.classList.add('local-overlays__backdrop');
}
this.backdropNode.slot = '_overlay-shadow-outlet';
this.contentNode.parentNode.insertBefore(this.backdropNode, this.contentNode);
break;
case 'show':
this.__hasActiveBackdrop = true;
break;
case 'hide':
if (!this.backdropNode) {
return;
}
this.__hasActiveBackdrop = false;
break;
case 'teardown':
if (!this.backdropNode) {
return;
}
this.backdropNode.parentNode.removeChild(this.backdropNode);
break;
/* no default */
}
return;
}
const { backdropNode } = this;
switch (phase) {
case 'init':
this.backdropNode = document.createElement('div');
this.backdropNode.classList.add('global-overlays__backdrop');
this._contentWrapperNode.parentElement.insertBefore(
this.backdropNode,
this._contentWrapperNode,
);
break;
case 'show':
backdropNode.classList.add('global-overlays__backdrop--visible');
if (animation === true) {
backdropNode.classList.add('global-overlays__backdrop--fade-in');
}
this.__hasActiveBackdrop = true;
break;
case 'hide':
if (!backdropNode) {
return;
}
backdropNode.classList.remove('global-overlays__backdrop--fade-in');
if (animation) {
let afterFadeOut;
backdropNode.classList.add('global-overlays__backdrop--fade-out');
this.__backDropAnimation = new Promise(resolve => {
afterFadeOut = () => {
backdropNode.classList.remove('global-overlays__backdrop--fade-out');
backdropNode.classList.remove('global-overlays__backdrop--visible');
backdropNode.removeEventListener('animationend', afterFadeOut);
resolve();
};
});
backdropNode.addEventListener('animationend', afterFadeOut);
} else {
backdropNode.classList.remove('global-overlays__backdrop--visible');
}
this.__hasActiveBackdrop = false;
break;
case 'teardown':
if (!backdropNode) {
return;
}
if (animation && this.__backDropAnimation) {
this.__backDropAnimation.then(() => {
backdropNode.parentNode.removeChild(backdropNode);
});
} else {
backdropNode.parentNode.removeChild(backdropNode);
}
break;
/* no default */
}
}
get hasActiveTrapsKeyboardFocus() {
return this.__hasActiveTrapsKeyboardFocus;
}
_handleTrapsKeyboardFocus({ phase }) {
if (phase === 'show') {
this.enableTrapsKeyboardFocus();
} else if (phase === 'hide' || phase === 'teardown') {
this.disableTrapsKeyboardFocus();
}
}
enableTrapsKeyboardFocus() {
if (this.__hasActiveTrapsKeyboardFocus) {
return;
}
if (this.manager) {
this.manager.disableTrapsKeyboardFocusForAll();
}
this._containFocusHandler = containFocus(this.contentNode);
this.__hasActiveTrapsKeyboardFocus = true;
if (this.manager) {
this.manager.informTrapsKeyboardFocusGotEnabled();
}
}
disableTrapsKeyboardFocus({ findNewTrap = true } = {}) {
if (!this.__hasActiveTrapsKeyboardFocus) {
return;
}
if (this._containFocusHandler) {
this._containFocusHandler.disconnect();
this._containFocusHandler = undefined;
}
this.__hasActiveTrapsKeyboardFocus = false;
if (this.manager) {
this.manager.informTrapsKeyboardFocusGotDisabled({ disabledCtrl: this, findNewTrap });
}
}
_handleHidesOnEsc({ phase }) {
if (phase === 'show') {
this.__escKeyHandler = ev => ev.key === 'Escape' && this.hide();
this.contentNode.addEventListener('keyup', this.__escKeyHandler);
if (this.invokerNode) {
this.invokerNode.addEventListener('keyup', this.__escKeyHandler);
}
} else if (phase === 'hide') {
this.contentNode.removeEventListener('keyup', this.__escKeyHandler);
if (this.invokerNode) {
this.invokerNode.removeEventListener('keyup', this.__escKeyHandler);
}
}
}
_handleHidesOnOutsideEsc({ phase }) {
if (phase === 'show') {
this.__escKeyHandler = ev => ev.key === 'Escape' && this.hide();
document.addEventListener('keyup', this.__escKeyHandler);
} else if (phase === 'hide') {
document.removeEventListener('keyup', this.__escKeyHandler);
}
}
_handleInheritsReferenceWidth() {
if (!this._referenceNode || this.placementMode === 'global') {
return;
}
const referenceWidth = `${this._referenceNode.clientWidth}px`;
switch (this.inheritsReferenceWidth) {
case 'max':
this._contentWrapperNode.style.maxWidth = referenceWidth;
break;
case 'full':
this._contentWrapperNode.style.width = referenceWidth;
break;
case 'min':
this._contentWrapperNode.style.minWidth = referenceWidth;
this._contentWrapperNode.style.width = 'auto';
break;
/* no default */
}
}
_handleHidesOnOutsideClick({ phase }) {
const addOrRemoveListener = phase === 'show' ? 'addEventListener' : 'removeEventListener';
if (phase === 'show') {
let wasClickInside = false;
// handle on capture phase and remember till the next task that there was an inside click
this.__preventCloseOutsideClick = () => {
wasClickInside = true;
setTimeout(() => {
wasClickInside = false;
});
};
// handle on capture phase and schedule the hide if needed
this.__onCaptureHtmlClick = () => {
setTimeout(() => {
if (wasClickInside === false) {
this.hide();
}
});
};
}
this._contentWrapperNode[addOrRemoveListener]('click', this.__preventCloseOutsideClick, true);
if (this.invokerNode) {
this.invokerNode[addOrRemoveListener]('click', this.__preventCloseOutsideClick, true);
}
document.documentElement[addOrRemoveListener]('click', this.__onCaptureHtmlClick, true);
}
_handleAccessibility({ phase }) {
if (this.invokerNode && !this.isTooltip) {
this.invokerNode.setAttribute('aria-expanded', phase === 'show');
}
}
teardown() {
this._handleFeatures({ phase: 'teardown' });
// Remove the content node wrapper from the global rootnode
this._teardowncontentWrapperNode();
}
_teardowncontentWrapperNode() {
if (
this.placementMode === 'global' &&
this._contentWrapperNode &&
this._contentWrapperNode.parentNode
) {
this._contentWrapperNode.parentNode.removeChild(this._contentWrapperNode);
}
}
async __createPopperInstance() {
if (this._popper) {
this._popper.destroy();
this._popper = null;
}
const { default: Popper } = await this.constructor.popperModule;
this._popper = new Popper(this._referenceNode, this._contentWrapperNode, {
...this.config.popperConfig,
});
}
__fakeExtendsEventTarget() {
const delegate = document.createDocumentFragment();
['addEventListener', 'dispatchEvent', 'removeEventListener'].forEach(funcName => {
this[funcName] = (...args) => delegate[funcName](...args);
});
}
}