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ModalManager.js
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Fri, Jan 10, 10:35

ModalManager.js
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import { unstable_ownerWindow as ownerWindow, unstable_ownerDocument as ownerDocument, unstable_getScrollbarSize as getScrollbarSize } from '@mui/utils';
// Is a vertical scrollbar displayed?
function isOverflowing(container) {
const doc = ownerDocument(container);
if (doc.body === container) {
return ownerWindow(container).innerWidth > doc.documentElement.clientWidth;
}
return container.scrollHeight > container.clientHeight;
}
export function ariaHidden(element, show) {
if (show) {
element.setAttribute('aria-hidden', 'true');
} else {
element.removeAttribute('aria-hidden');
}
}
function getPaddingRight(element) {
return parseInt(ownerWindow(element).getComputedStyle(element).paddingRight, 10) || 0;
}
function isAriaHiddenForbiddenOnElement(element) {
// The forbidden HTML tags are the ones from ARIA specification that
// can be children of body and can't have aria-hidden attribute.
// cf. https://www.w3.org/TR/html-aria/#docconformance
const forbiddenTagNames = ['TEMPLATE', 'SCRIPT', 'STYLE', 'LINK', 'MAP', 'META', 'NOSCRIPT', 'PICTURE', 'COL', 'COLGROUP', 'PARAM', 'SLOT', 'SOURCE', 'TRACK'];
const isForbiddenTagName = forbiddenTagNames.indexOf(element.tagName) !== -1;
const isInputHidden = element.tagName === 'INPUT' && element.getAttribute('type') === 'hidden';
return isForbiddenTagName || isInputHidden;
}
function ariaHiddenSiblings(container, mountElement, currentElement, elementsToExclude, show) {
const blacklist = [mountElement, currentElement, ...elementsToExclude];
[].forEach.call(container.children, element => {
const isNotExcludedElement = blacklist.indexOf(element) === -1;
const isNotForbiddenElement = !isAriaHiddenForbiddenOnElement(element);
if (isNotExcludedElement && isNotForbiddenElement) {
ariaHidden(element, show);
}
});
}
function findIndexOf(items, callback) {
let idx = -1;
items.some((item, index) => {
if (callback(item)) {
idx = index;
return true;
}
return false;
});
return idx;
}
function handleContainer(containerInfo, props) {
const restoreStyle = [];
const container = containerInfo.container;
if (!props.disableScrollLock) {
if (isOverflowing(container)) {
// Compute the size before applying overflow hidden to avoid any scroll jumps.
const scrollbarSize = getScrollbarSize(ownerDocument(container));
restoreStyle.push({
value: container.style.paddingRight,
property: 'padding-right',
el: container
});
// Use computed style, here to get the real padding to add our scrollbar width.
container.style.paddingRight = `${getPaddingRight(container) + scrollbarSize}px`;
// .mui-fixed is a global helper.
const fixedElements = ownerDocument(container).querySelectorAll('.mui-fixed');
[].forEach.call(fixedElements, element => {
restoreStyle.push({
value: element.style.paddingRight,
property: 'padding-right',
el: element
});
element.style.paddingRight = `${getPaddingRight(element) + scrollbarSize}px`;
});
}
let scrollContainer;
if (container.parentNode instanceof DocumentFragment) {
scrollContainer = ownerDocument(container).body;
} else {
// Improve Gatsby support
// https://css-tricks.com/snippets/css/force-vertical-scrollbar/
const parent = container.parentElement;
const containerWindow = ownerWindow(container);
scrollContainer = parent?.nodeName === 'HTML' && containerWindow.getComputedStyle(parent).overflowY === 'scroll' ? parent : container;
}
// Block the scroll even if no scrollbar is visible to account for mobile keyboard
// screensize shrink.
restoreStyle.push({
value: scrollContainer.style.overflow,
property: 'overflow',
el: scrollContainer
}, {
value: scrollContainer.style.overflowX,
property: 'overflow-x',
el: scrollContainer
}, {
value: scrollContainer.style.overflowY,
property: 'overflow-y',
el: scrollContainer
});
scrollContainer.style.overflow = 'hidden';
}
const restore = () => {
restoreStyle.forEach(({
value,
el,
property
}) => {
if (value) {
el.style.setProperty(property, value);
} else {
el.style.removeProperty(property);
}
});
};
return restore;
}
function getHiddenSiblings(container) {
const hiddenSiblings = [];
[].forEach.call(container.children, element => {
if (element.getAttribute('aria-hidden') === 'true') {
hiddenSiblings.push(element);
}
});
return hiddenSiblings;
}
/**
* @ignore - do not document.
*
* Proper state management for containers and the modals in those containers.
* Simplified, but inspired by react-overlay's ModalManager class.
* Used by the Modal to ensure proper styling of containers.
*/
export default class ModalManager {
constructor() {
this.containers = void 0;
this.modals = void 0;
this.modals = [];
this.containers = [];
}
add(modal, container) {
let modalIndex = this.modals.indexOf(modal);
if (modalIndex !== -1) {
return modalIndex;
}
modalIndex = this.modals.length;
this.modals.push(modal);
// If the modal we are adding is already in the DOM.
if (modal.modalRef) {
ariaHidden(modal.modalRef, false);
}
const hiddenSiblings = getHiddenSiblings(container);
ariaHiddenSiblings(container, modal.mount, modal.modalRef, hiddenSiblings, true);
const containerIndex = findIndexOf(this.containers, item => item.container === container);
if (containerIndex !== -1) {
this.containers[containerIndex].modals.push(modal);
return modalIndex;
}
this.containers.push({
modals: [modal],
container,
restore: null,
hiddenSiblings
});
return modalIndex;
}
mount(modal, props) {
const containerIndex = findIndexOf(this.containers, item => item.modals.indexOf(modal) !== -1);
const containerInfo = this.containers[containerIndex];
if (!containerInfo.restore) {
containerInfo.restore = handleContainer(containerInfo, props);
}
}
remove(modal, ariaHiddenState = true) {
const modalIndex = this.modals.indexOf(modal);
if (modalIndex === -1) {
return modalIndex;
}
const containerIndex = findIndexOf(this.containers, item => item.modals.indexOf(modal) !== -1);
const containerInfo = this.containers[containerIndex];
containerInfo.modals.splice(containerInfo.modals.indexOf(modal), 1);
this.modals.splice(modalIndex, 1);
// If that was the last modal in a container, clean up the container.
if (containerInfo.modals.length === 0) {
// The modal might be closed before it had the chance to be mounted in the DOM.
if (containerInfo.restore) {
containerInfo.restore();
}
if (modal.modalRef) {
// In case the modal wasn't in the DOM yet.
ariaHidden(modal.modalRef, ariaHiddenState);
}
ariaHiddenSiblings(containerInfo.container, modal.mount, modal.modalRef, containerInfo.hiddenSiblings, false);
this.containers.splice(containerIndex, 1);
} else {
// Otherwise make sure the next top modal is visible to a screen reader.
const nextTop = containerInfo.modals[containerInfo.modals.length - 1];
// as soon as a modal is adding its modalRef is undefined. it can't set
// aria-hidden because the dom element doesn't exist either
// when modal was unmounted before modalRef gets null
if (nextTop.modalRef) {
ariaHidden(nextTop.modalRef, false);
}
}
return modalIndex;
}
isTopModal(modal) {
return this.modals.length > 0 && this.modals[this.modals.length - 1] === modal;
}
}

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