841 lines
30 KiB
JavaScript
841 lines
30 KiB
JavaScript
|
(function (global, factory) {
|
||
|
|
typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
|
||
|
|
typeof define === 'function' && define.amd ? define('inert', factory) :
|
||
|
|
(factory());
|
||
|
|
}(this, (function () { 'use strict';
|
||
|
|
|
||
|
|
var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
|
||
|
|
|
||
|
|
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This work is licensed under the W3C Software and Document License
|
||
|
|
* (http://www.w3.org/Consortium/Legal/2015/copyright-software-and-document).
|
||
|
|
*/
|
||
|
|
|
||
|
|
(function () {
|
||
|
|
// Return early if we're not running inside of the browser.
|
||
|
|
if (typeof window === 'undefined') {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convenience function for converting NodeLists.
|
||
|
|
/** @type {typeof Array.prototype.slice} */
|
||
|
|
var slice = Array.prototype.slice;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* IE has a non-standard name for "matches".
|
||
|
|
* @type {typeof Element.prototype.matches}
|
||
|
|
*/
|
||
|
|
var matches = Element.prototype.matches || Element.prototype.msMatchesSelector;
|
||
|
|
|
||
|
|
/** @type {string} */
|
||
|
|
var _focusableElementsString = ['a[href]', 'area[href]', 'input:not([disabled])', 'select:not([disabled])', 'textarea:not([disabled])', 'button:not([disabled])', 'details', 'summary', 'iframe', 'object', 'embed', '[contenteditable]'].join(',');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* `InertRoot` manages a single inert subtree, i.e. a DOM subtree whose root element has an `inert`
|
||
|
|
* attribute.
|
||
|
|
*
|
||
|
|
* Its main functions are:
|
||
|
|
*
|
||
|
|
* - to create and maintain a set of managed `InertNode`s, including when mutations occur in the
|
||
|
|
* subtree. The `makeSubtreeUnfocusable()` method handles collecting `InertNode`s via registering
|
||
|
|
* each focusable node in the subtree with the singleton `InertManager` which manages all known
|
||
|
|
* focusable nodes within inert subtrees. `InertManager` ensures that a single `InertNode`
|
||
|
|
* instance exists for each focusable node which has at least one inert root as an ancestor.
|
||
|
|
*
|
||
|
|
* - to notify all managed `InertNode`s when this subtree stops being inert (i.e. when the `inert`
|
||
|
|
* attribute is removed from the root node). This is handled in the destructor, which calls the
|
||
|
|
* `deregister` method on `InertManager` for each managed inert node.
|
||
|
|
*/
|
||
|
|
|
||
|
|
var InertRoot = function () {
|
||
|
|
/**
|
||
|
|
* @param {!HTMLElement} rootElement The HTMLElement at the root of the inert subtree.
|
||
|
|
* @param {!InertManager} inertManager The global singleton InertManager object.
|
||
|
|
*/
|
||
|
|
function InertRoot(rootElement, inertManager) {
|
||
|
|
_classCallCheck(this, InertRoot);
|
||
|
|
|
||
|
|
/** @type {!InertManager} */
|
||
|
|
this._inertManager = inertManager;
|
||
|
|
|
||
|
|
/** @type {!HTMLElement} */
|
||
|
|
this._rootElement = rootElement;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @type {!Set<!InertNode>}
|
||
|
|
* All managed focusable nodes in this InertRoot's subtree.
|
||
|
|
*/
|
||
|
|
this._managedNodes = new Set();
|
||
|
|
|
||
|
|
// Make the subtree hidden from assistive technology
|
||
|
|
if (this._rootElement.hasAttribute('aria-hidden')) {
|
||
|
|
/** @type {?string} */
|
||
|
|
this._savedAriaHidden = this._rootElement.getAttribute('aria-hidden');
|
||
|
|
} else {
|
||
|
|
this._savedAriaHidden = null;
|
||
|
|
}
|
||
|
|
this._rootElement.setAttribute('aria-hidden', 'true');
|
||
|
|
|
||
|
|
// Make all focusable elements in the subtree unfocusable and add them to _managedNodes
|
||
|
|
this._makeSubtreeUnfocusable(this._rootElement);
|
||
|
|
|
||
|
|
// Watch for:
|
||
|
|
// - any additions in the subtree: make them unfocusable too
|
||
|
|
// - any removals from the subtree: remove them from this inert root's managed nodes
|
||
|
|
// - attribute changes: if `tabindex` is added, or removed from an intrinsically focusable
|
||
|
|
// element, make that node a managed node.
|
||
|
|
this._observer = new MutationObserver(this._onMutation.bind(this));
|
||
|
|
this._observer.observe(this._rootElement, { attributes: true, childList: true, subtree: true });
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Call this whenever this object is about to become obsolete. This unwinds all of the state
|
||
|
|
* stored in this object and updates the state of all of the managed nodes.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
_createClass(InertRoot, [{
|
||
|
|
key: 'destructor',
|
||
|
|
value: function destructor() {
|
||
|
|
this._observer.disconnect();
|
||
|
|
|
||
|
|
if (this._rootElement) {
|
||
|
|
if (this._savedAriaHidden !== null) {
|
||
|
|
this._rootElement.setAttribute('aria-hidden', this._savedAriaHidden);
|
||
|
|
} else {
|
||
|
|
this._rootElement.removeAttribute('aria-hidden');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
this._managedNodes.forEach(function (inertNode) {
|
||
|
|
this._unmanageNode(inertNode.node);
|
||
|
|
}, this);
|
||
|
|
|
||
|
|
// Note we cast the nulls to the ANY type here because:
|
||
|
|
// 1) We want the class properties to be declared as non-null, or else we
|
||
|
|
// need even more casts throughout this code. All bets are off if an
|
||
|
|
// instance has been destroyed and a method is called.
|
||
|
|
// 2) We don't want to cast "this", because we want type-aware optimizations
|
||
|
|
// to know which properties we're setting.
|
||
|
|
this._observer = /** @type {?} */null;
|
||
|
|
this._rootElement = /** @type {?} */null;
|
||
|
|
this._managedNodes = /** @type {?} */null;
|
||
|
|
this._inertManager = /** @type {?} */null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @return {!Set<!InertNode>} A copy of this InertRoot's managed nodes set.
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_makeSubtreeUnfocusable',
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {!Node} startNode
|
||
|
|
*/
|
||
|
|
value: function _makeSubtreeUnfocusable(startNode) {
|
||
|
|
var _this2 = this;
|
||
|
|
|
||
|
|
composedTreeWalk(startNode, function (node) {
|
||
|
|
return _this2._visitNode(node);
|
||
|
|
});
|
||
|
|
|
||
|
|
var activeElement = document.activeElement;
|
||
|
|
|
||
|
|
if (!document.body.contains(startNode)) {
|
||
|
|
// startNode may be in shadow DOM, so find its nearest shadowRoot to get the activeElement.
|
||
|
|
var node = startNode;
|
||
|
|
/** @type {!ShadowRoot|undefined} */
|
||
|
|
var root = undefined;
|
||
|
|
while (node) {
|
||
|
|
if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
|
||
|
|
root = /** @type {!ShadowRoot} */node;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
node = node.parentNode;
|
||
|
|
}
|
||
|
|
if (root) {
|
||
|
|
activeElement = root.activeElement;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (startNode.contains(activeElement)) {
|
||
|
|
activeElement.blur();
|
||
|
|
// In IE11, if an element is already focused, and then set to tabindex=-1
|
||
|
|
// calling blur() will not actually move the focus.
|
||
|
|
// To work around this we call focus() on the body instead.
|
||
|
|
if (activeElement === document.activeElement) {
|
||
|
|
document.body.focus();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {!Node} node
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_visitNode',
|
||
|
|
value: function _visitNode(node) {
|
||
|
|
if (node.nodeType !== Node.ELEMENT_NODE) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
var element = /** @type {!HTMLElement} */node;
|
||
|
|
|
||
|
|
// If a descendant inert root becomes un-inert, its descendants will still be inert because of
|
||
|
|
// this inert root, so all of its managed nodes need to be adopted by this InertRoot.
|
||
|
|
if (element !== this._rootElement && element.hasAttribute('inert')) {
|
||
|
|
this._adoptInertRoot(element);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (matches.call(element, _focusableElementsString) || element.hasAttribute('tabindex')) {
|
||
|
|
this._manageNode(element);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Register the given node with this InertRoot and with InertManager.
|
||
|
|
* @param {!Node} node
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_manageNode',
|
||
|
|
value: function _manageNode(node) {
|
||
|
|
var inertNode = this._inertManager.register(node, this);
|
||
|
|
this._managedNodes.add(inertNode);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Unregister the given node with this InertRoot and with InertManager.
|
||
|
|
* @param {!Node} node
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_unmanageNode',
|
||
|
|
value: function _unmanageNode(node) {
|
||
|
|
var inertNode = this._inertManager.deregister(node, this);
|
||
|
|
if (inertNode) {
|
||
|
|
this._managedNodes['delete'](inertNode);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Unregister the entire subtree starting at `startNode`.
|
||
|
|
* @param {!Node} startNode
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_unmanageSubtree',
|
||
|
|
value: function _unmanageSubtree(startNode) {
|
||
|
|
var _this3 = this;
|
||
|
|
|
||
|
|
composedTreeWalk(startNode, function (node) {
|
||
|
|
return _this3._unmanageNode(node);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* If a descendant node is found with an `inert` attribute, adopt its managed nodes.
|
||
|
|
* @param {!HTMLElement} node
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_adoptInertRoot',
|
||
|
|
value: function _adoptInertRoot(node) {
|
||
|
|
var inertSubroot = this._inertManager.getInertRoot(node);
|
||
|
|
|
||
|
|
// During initialisation this inert root may not have been registered yet,
|
||
|
|
// so register it now if need be.
|
||
|
|
if (!inertSubroot) {
|
||
|
|
this._inertManager.setInert(node, true);
|
||
|
|
inertSubroot = this._inertManager.getInertRoot(node);
|
||
|
|
}
|
||
|
|
|
||
|
|
inertSubroot.managedNodes.forEach(function (savedInertNode) {
|
||
|
|
this._manageNode(savedInertNode.node);
|
||
|
|
}, this);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Callback used when mutation observer detects subtree additions, removals, or attribute changes.
|
||
|
|
* @param {!Array<!MutationRecord>} records
|
||
|
|
* @param {!MutationObserver} self
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_onMutation',
|
||
|
|
value: function _onMutation(records, self) {
|
||
|
|
records.forEach(function (record) {
|
||
|
|
var target = /** @type {!HTMLElement} */record.target;
|
||
|
|
if (record.type === 'childList') {
|
||
|
|
// Manage added nodes
|
||
|
|
slice.call(record.addedNodes).forEach(function (node) {
|
||
|
|
this._makeSubtreeUnfocusable(node);
|
||
|
|
}, this);
|
||
|
|
|
||
|
|
// Un-manage removed nodes
|
||
|
|
slice.call(record.removedNodes).forEach(function (node) {
|
||
|
|
this._unmanageSubtree(node);
|
||
|
|
}, this);
|
||
|
|
} else if (record.type === 'attributes') {
|
||
|
|
if (record.attributeName === 'tabindex') {
|
||
|
|
// Re-initialise inert node if tabindex changes
|
||
|
|
this._manageNode(target);
|
||
|
|
} else if (target !== this._rootElement && record.attributeName === 'inert' && target.hasAttribute('inert')) {
|
||
|
|
// If a new inert root is added, adopt its managed nodes and make sure it knows about the
|
||
|
|
// already managed nodes from this inert subroot.
|
||
|
|
this._adoptInertRoot(target);
|
||
|
|
var inertSubroot = this._inertManager.getInertRoot(target);
|
||
|
|
this._managedNodes.forEach(function (managedNode) {
|
||
|
|
if (target.contains(managedNode.node)) {
|
||
|
|
inertSubroot._manageNode(managedNode.node);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}, this);
|
||
|
|
}
|
||
|
|
}, {
|
||
|
|
key: 'managedNodes',
|
||
|
|
get: function get() {
|
||
|
|
return new Set(this._managedNodes);
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @return {boolean} */
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'hasSavedAriaHidden',
|
||
|
|
get: function get() {
|
||
|
|
return this._savedAriaHidden !== null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @param {?string} ariaHidden */
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'savedAriaHidden',
|
||
|
|
set: function set(ariaHidden) {
|
||
|
|
this._savedAriaHidden = ariaHidden;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @return {?string} */
|
||
|
|
,
|
||
|
|
get: function get() {
|
||
|
|
return this._savedAriaHidden;
|
||
|
|
}
|
||
|
|
}]);
|
||
|
|
|
||
|
|
return InertRoot;
|
||
|
|
}();
|
||
|
|
|
||
|
|
/**
|
||
|
|
* `InertNode` initialises and manages a single inert node.
|
||
|
|
* A node is inert if it is a descendant of one or more inert root elements.
|
||
|
|
*
|
||
|
|
* On construction, `InertNode` saves the existing `tabindex` value for the node, if any, and
|
||
|
|
* either removes the `tabindex` attribute or sets it to `-1`, depending on whether the element
|
||
|
|
* is intrinsically focusable or not.
|
||
|
|
*
|
||
|
|
* `InertNode` maintains a set of `InertRoot`s which are descendants of this `InertNode`. When an
|
||
|
|
* `InertRoot` is destroyed, and calls `InertManager.deregister()`, the `InertManager` notifies the
|
||
|
|
* `InertNode` via `removeInertRoot()`, which in turn destroys the `InertNode` if no `InertRoot`s
|
||
|
|
* remain in the set. On destruction, `InertNode` reinstates the stored `tabindex` if one exists,
|
||
|
|
* or removes the `tabindex` attribute if the element is intrinsically focusable.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
var InertNode = function () {
|
||
|
|
/**
|
||
|
|
* @param {!Node} node A focusable element to be made inert.
|
||
|
|
* @param {!InertRoot} inertRoot The inert root element associated with this inert node.
|
||
|
|
*/
|
||
|
|
function InertNode(node, inertRoot) {
|
||
|
|
_classCallCheck(this, InertNode);
|
||
|
|
|
||
|
|
/** @type {!Node} */
|
||
|
|
this._node = node;
|
||
|
|
|
||
|
|
/** @type {boolean} */
|
||
|
|
this._overrodeFocusMethod = false;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @type {!Set<!InertRoot>} The set of descendant inert roots.
|
||
|
|
* If and only if this set becomes empty, this node is no longer inert.
|
||
|
|
*/
|
||
|
|
this._inertRoots = new Set([inertRoot]);
|
||
|
|
|
||
|
|
/** @type {?number} */
|
||
|
|
this._savedTabIndex = null;
|
||
|
|
|
||
|
|
/** @type {boolean} */
|
||
|
|
this._destroyed = false;
|
||
|
|
|
||
|
|
// Save any prior tabindex info and make this node untabbable
|
||
|
|
this.ensureUntabbable();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Call this whenever this object is about to become obsolete.
|
||
|
|
* This makes the managed node focusable again and deletes all of the previously stored state.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
_createClass(InertNode, [{
|
||
|
|
key: 'destructor',
|
||
|
|
value: function destructor() {
|
||
|
|
this._throwIfDestroyed();
|
||
|
|
|
||
|
|
if (this._node && this._node.nodeType === Node.ELEMENT_NODE) {
|
||
|
|
var element = /** @type {!HTMLElement} */this._node;
|
||
|
|
if (this._savedTabIndex !== null) {
|
||
|
|
element.setAttribute('tabindex', this._savedTabIndex);
|
||
|
|
} else {
|
||
|
|
element.removeAttribute('tabindex');
|
||
|
|
}
|
||
|
|
|
||
|
|
// Use `delete` to restore native focus method.
|
||
|
|
if (this._overrodeFocusMethod) {
|
||
|
|
delete element.focus;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// See note in InertRoot.destructor for why we cast these nulls to ANY.
|
||
|
|
this._node = /** @type {?} */null;
|
||
|
|
this._inertRoots = /** @type {?} */null;
|
||
|
|
this._destroyed = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @type {boolean} Whether this object is obsolete because the managed node is no longer inert.
|
||
|
|
* If the object has been destroyed, any attempt to access it will cause an exception.
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_throwIfDestroyed',
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Throw if user tries to access destroyed InertNode.
|
||
|
|
*/
|
||
|
|
value: function _throwIfDestroyed() {
|
||
|
|
if (this.destroyed) {
|
||
|
|
throw new Error('Trying to access destroyed InertNode');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @return {boolean} */
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'ensureUntabbable',
|
||
|
|
|
||
|
|
|
||
|
|
/** Save the existing tabindex value and make the node untabbable and unfocusable */
|
||
|
|
value: function ensureUntabbable() {
|
||
|
|
if (this.node.nodeType !== Node.ELEMENT_NODE) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
var element = /** @type {!HTMLElement} */this.node;
|
||
|
|
if (matches.call(element, _focusableElementsString)) {
|
||
|
|
if ( /** @type {!HTMLElement} */element.tabIndex === -1 && this.hasSavedTabIndex) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (element.hasAttribute('tabindex')) {
|
||
|
|
this._savedTabIndex = /** @type {!HTMLElement} */element.tabIndex;
|
||
|
|
}
|
||
|
|
element.setAttribute('tabindex', '-1');
|
||
|
|
if (element.nodeType === Node.ELEMENT_NODE) {
|
||
|
|
element.focus = function () {};
|
||
|
|
this._overrodeFocusMethod = true;
|
||
|
|
}
|
||
|
|
} else if (element.hasAttribute('tabindex')) {
|
||
|
|
this._savedTabIndex = /** @type {!HTMLElement} */element.tabIndex;
|
||
|
|
element.removeAttribute('tabindex');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add another inert root to this inert node's set of managing inert roots.
|
||
|
|
* @param {!InertRoot} inertRoot
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'addInertRoot',
|
||
|
|
value: function addInertRoot(inertRoot) {
|
||
|
|
this._throwIfDestroyed();
|
||
|
|
this._inertRoots.add(inertRoot);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Remove the given inert root from this inert node's set of managing inert roots.
|
||
|
|
* If the set of managing inert roots becomes empty, this node is no longer inert,
|
||
|
|
* so the object should be destroyed.
|
||
|
|
* @param {!InertRoot} inertRoot
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'removeInertRoot',
|
||
|
|
value: function removeInertRoot(inertRoot) {
|
||
|
|
this._throwIfDestroyed();
|
||
|
|
this._inertRoots['delete'](inertRoot);
|
||
|
|
if (this._inertRoots.size === 0) {
|
||
|
|
this.destructor();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}, {
|
||
|
|
key: 'destroyed',
|
||
|
|
get: function get() {
|
||
|
|
return (/** @type {!InertNode} */this._destroyed
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}, {
|
||
|
|
key: 'hasSavedTabIndex',
|
||
|
|
get: function get() {
|
||
|
|
return this._savedTabIndex !== null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @return {!Node} */
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'node',
|
||
|
|
get: function get() {
|
||
|
|
this._throwIfDestroyed();
|
||
|
|
return this._node;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @param {?number} tabIndex */
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'savedTabIndex',
|
||
|
|
set: function set(tabIndex) {
|
||
|
|
this._throwIfDestroyed();
|
||
|
|
this._savedTabIndex = tabIndex;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @return {?number} */
|
||
|
|
,
|
||
|
|
get: function get() {
|
||
|
|
this._throwIfDestroyed();
|
||
|
|
return this._savedTabIndex;
|
||
|
|
}
|
||
|
|
}]);
|
||
|
|
|
||
|
|
return InertNode;
|
||
|
|
}();
|
||
|
|
|
||
|
|
/**
|
||
|
|
* InertManager is a per-document singleton object which manages all inert roots and nodes.
|
||
|
|
*
|
||
|
|
* When an element becomes an inert root by having an `inert` attribute set and/or its `inert`
|
||
|
|
* property set to `true`, the `setInert` method creates an `InertRoot` object for the element.
|
||
|
|
* The `InertRoot` in turn registers itself as managing all of the element's focusable descendant
|
||
|
|
* nodes via the `register()` method. The `InertManager` ensures that a single `InertNode` instance
|
||
|
|
* is created for each such node, via the `_managedNodes` map.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
var InertManager = function () {
|
||
|
|
/**
|
||
|
|
* @param {!Document} document
|
||
|
|
*/
|
||
|
|
function InertManager(document) {
|
||
|
|
_classCallCheck(this, InertManager);
|
||
|
|
|
||
|
|
if (!document) {
|
||
|
|
throw new Error('Missing required argument; InertManager needs to wrap a document.');
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @type {!Document} */
|
||
|
|
this._document = document;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* All managed nodes known to this InertManager. In a map to allow looking up by Node.
|
||
|
|
* @type {!Map<!Node, !InertNode>}
|
||
|
|
*/
|
||
|
|
this._managedNodes = new Map();
|
||
|
|
|
||
|
|
/**
|
||
|
|
* All inert roots known to this InertManager. In a map to allow looking up by Node.
|
||
|
|
* @type {!Map<!Node, !InertRoot>}
|
||
|
|
*/
|
||
|
|
this._inertRoots = new Map();
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Observer for mutations on `document.body`.
|
||
|
|
* @type {!MutationObserver}
|
||
|
|
*/
|
||
|
|
this._observer = new MutationObserver(this._watchForInert.bind(this));
|
||
|
|
|
||
|
|
// Add inert style.
|
||
|
|
addInertStyle(document.head || document.body || document.documentElement);
|
||
|
|
|
||
|
|
// Wait for document to be loaded.
|
||
|
|
if (document.readyState === 'loading') {
|
||
|
|
document.addEventListener('DOMContentLoaded', this._onDocumentLoaded.bind(this));
|
||
|
|
} else {
|
||
|
|
this._onDocumentLoaded();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Set whether the given element should be an inert root or not.
|
||
|
|
* @param {!HTMLElement} root
|
||
|
|
* @param {boolean} inert
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
_createClass(InertManager, [{
|
||
|
|
key: 'setInert',
|
||
|
|
value: function setInert(root, inert) {
|
||
|
|
if (inert) {
|
||
|
|
if (this._inertRoots.has(root)) {
|
||
|
|
// element is already inert
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
var inertRoot = new InertRoot(root, this);
|
||
|
|
root.setAttribute('inert', '');
|
||
|
|
this._inertRoots.set(root, inertRoot);
|
||
|
|
// If not contained in the document, it must be in a shadowRoot.
|
||
|
|
// Ensure inert styles are added there.
|
||
|
|
if (!this._document.body.contains(root)) {
|
||
|
|
var parent = root.parentNode;
|
||
|
|
while (parent) {
|
||
|
|
if (parent.nodeType === 11) {
|
||
|
|
addInertStyle(parent);
|
||
|
|
}
|
||
|
|
parent = parent.parentNode;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (!this._inertRoots.has(root)) {
|
||
|
|
// element is already non-inert
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
var _inertRoot = this._inertRoots.get(root);
|
||
|
|
_inertRoot.destructor();
|
||
|
|
this._inertRoots['delete'](root);
|
||
|
|
root.removeAttribute('inert');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get the InertRoot object corresponding to the given inert root element, if any.
|
||
|
|
* @param {!Node} element
|
||
|
|
* @return {!InertRoot|undefined}
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'getInertRoot',
|
||
|
|
value: function getInertRoot(element) {
|
||
|
|
return this._inertRoots.get(element);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Register the given InertRoot as managing the given node.
|
||
|
|
* In the case where the node has a previously existing inert root, this inert root will
|
||
|
|
* be added to its set of inert roots.
|
||
|
|
* @param {!Node} node
|
||
|
|
* @param {!InertRoot} inertRoot
|
||
|
|
* @return {!InertNode} inertNode
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'register',
|
||
|
|
value: function register(node, inertRoot) {
|
||
|
|
var inertNode = this._managedNodes.get(node);
|
||
|
|
if (inertNode !== undefined) {
|
||
|
|
// node was already in an inert subtree
|
||
|
|
inertNode.addInertRoot(inertRoot);
|
||
|
|
} else {
|
||
|
|
inertNode = new InertNode(node, inertRoot);
|
||
|
|
}
|
||
|
|
|
||
|
|
this._managedNodes.set(node, inertNode);
|
||
|
|
|
||
|
|
return inertNode;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* De-register the given InertRoot as managing the given inert node.
|
||
|
|
* Removes the inert root from the InertNode's set of managing inert roots, and remove the inert
|
||
|
|
* node from the InertManager's set of managed nodes if it is destroyed.
|
||
|
|
* If the node is not currently managed, this is essentially a no-op.
|
||
|
|
* @param {!Node} node
|
||
|
|
* @param {!InertRoot} inertRoot
|
||
|
|
* @return {?InertNode} The potentially destroyed InertNode associated with this node, if any.
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: 'deregister',
|
||
|
|
value: function deregister(node, inertRoot) {
|
||
|
|
var inertNode = this._managedNodes.get(node);
|
||
|
|
if (!inertNode) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
inertNode.removeInertRoot(inertRoot);
|
||
|
|
if (inertNode.destroyed) {
|
||
|
|
this._managedNodes['delete'](node);
|
||
|
|
}
|
||
|
|
|
||
|
|
return inertNode;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Callback used when document has finished loading.
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_onDocumentLoaded',
|
||
|
|
value: function _onDocumentLoaded() {
|
||
|
|
// Find all inert roots in document and make them actually inert.
|
||
|
|
var inertElements = slice.call(this._document.querySelectorAll('[inert]'));
|
||
|
|
inertElements.forEach(function (inertElement) {
|
||
|
|
this.setInert(inertElement, true);
|
||
|
|
}, this);
|
||
|
|
|
||
|
|
// Comment this out to use programmatic API only.
|
||
|
|
this._observer.observe(this._document.body || this._document.documentElement, { attributes: true, subtree: true, childList: true });
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Callback used when mutation observer detects attribute changes.
|
||
|
|
* @param {!Array<!MutationRecord>} records
|
||
|
|
* @param {!MutationObserver} self
|
||
|
|
*/
|
||
|
|
|
||
|
|
}, {
|
||
|
|
key: '_watchForInert',
|
||
|
|
value: function _watchForInert(records, self) {
|
||
|
|
var _this = this;
|
||
|
|
records.forEach(function (record) {
|
||
|
|
switch (record.type) {
|
||
|
|
case 'childList':
|
||
|
|
slice.call(record.addedNodes).forEach(function (node) {
|
||
|
|
if (node.nodeType !== Node.ELEMENT_NODE) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
var inertElements = slice.call(node.querySelectorAll('[inert]'));
|
||
|
|
if (matches.call(node, '[inert]')) {
|
||
|
|
inertElements.unshift(node);
|
||
|
|
}
|
||
|
|
inertElements.forEach(function (inertElement) {
|
||
|
|
this.setInert(inertElement, true);
|
||
|
|
}, _this);
|
||
|
|
}, _this);
|
||
|
|
break;
|
||
|
|
case 'attributes':
|
||
|
|
if (record.attributeName !== 'inert') {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
var target = /** @type {!HTMLElement} */record.target;
|
||
|
|
var inert = target.hasAttribute('inert');
|
||
|
|
_this.setInert(target, inert);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}, this);
|
||
|
|
}
|
||
|
|
}]);
|
||
|
|
|
||
|
|
return InertManager;
|
||
|
|
}();
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Recursively walk the composed tree from |node|.
|
||
|
|
* @param {!Node} node
|
||
|
|
* @param {(function (!HTMLElement))=} callback Callback to be called for each element traversed,
|
||
|
|
* before descending into child nodes.
|
||
|
|
* @param {?ShadowRoot=} shadowRootAncestor The nearest ShadowRoot ancestor, if any.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
function composedTreeWalk(node, callback, shadowRootAncestor) {
|
||
|
|
if (node.nodeType == Node.ELEMENT_NODE) {
|
||
|
|
var element = /** @type {!HTMLElement} */node;
|
||
|
|
if (callback) {
|
||
|
|
callback(element);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Descend into node:
|
||
|
|
// If it has a ShadowRoot, ignore all child elements - these will be picked
|
||
|
|
// up by the <content> or <shadow> elements. Descend straight into the
|
||
|
|
// ShadowRoot.
|
||
|
|
var shadowRoot = /** @type {!HTMLElement} */element.shadowRoot;
|
||
|
|
if (shadowRoot) {
|
||
|
|
composedTreeWalk(shadowRoot, callback, shadowRoot);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// If it is a <content> element, descend into distributed elements - these
|
||
|
|
// are elements from outside the shadow root which are rendered inside the
|
||
|
|
// shadow DOM.
|
||
|
|
if (element.localName == 'content') {
|
||
|
|
var content = /** @type {!HTMLContentElement} */element;
|
||
|
|
// Verifies if ShadowDom v0 is supported.
|
||
|
|
var distributedNodes = content.getDistributedNodes ? content.getDistributedNodes() : [];
|
||
|
|
for (var i = 0; i < distributedNodes.length; i++) {
|
||
|
|
composedTreeWalk(distributedNodes[i], callback, shadowRootAncestor);
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// If it is a <slot> element, descend into assigned nodes - these
|
||
|
|
// are elements from outside the shadow root which are rendered inside the
|
||
|
|
// shadow DOM.
|
||
|
|
if (element.localName == 'slot') {
|
||
|
|
var slot = /** @type {!HTMLSlotElement} */element;
|
||
|
|
// Verify if ShadowDom v1 is supported.
|
||
|
|
var _distributedNodes = slot.assignedNodes ? slot.assignedNodes({ flatten: true }) : [];
|
||
|
|
for (var _i = 0; _i < _distributedNodes.length; _i++) {
|
||
|
|
composedTreeWalk(_distributedNodes[_i], callback, shadowRootAncestor);
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// If it is neither the parent of a ShadowRoot, a <content> element, a <slot>
|
||
|
|
// element, nor a <shadow> element recurse normally.
|
||
|
|
var child = node.firstChild;
|
||
|
|
while (child != null) {
|
||
|
|
composedTreeWalk(child, callback, shadowRootAncestor);
|
||
|
|
child = child.nextSibling;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Adds a style element to the node containing the inert specific styles
|
||
|
|
* @param {!Node} node
|
||
|
|
*/
|
||
|
|
function addInertStyle(node) {
|
||
|
|
if (node.querySelector('style#inert-style, link#inert-style')) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
var style = document.createElement('style');
|
||
|
|
style.setAttribute('id', 'inert-style');
|
||
|
|
style.textContent = '\n' + '[inert] {\n' + ' pointer-events: none;\n' + ' cursor: default;\n' + '}\n' + '\n' + '[inert], [inert] * {\n' + ' -webkit-user-select: none;\n' + ' -moz-user-select: none;\n' + ' -ms-user-select: none;\n' + ' user-select: none;\n' + '}\n';
|
||
|
|
node.appendChild(style);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!HTMLElement.prototype.hasOwnProperty('inert')) {
|
||
|
|
/** @type {!InertManager} */
|
||
|
|
var inertManager = new InertManager(document);
|
||
|
|
|
||
|
|
Object.defineProperty(HTMLElement.prototype, 'inert', {
|
||
|
|
enumerable: true,
|
||
|
|
/** @this {!HTMLElement} */
|
||
|
|
get: function get() {
|
||
|
|
return this.hasAttribute('inert');
|
||
|
|
},
|
||
|
|
/** @this {!HTMLElement} */
|
||
|
|
set: function set(inert) {
|
||
|
|
inertManager.setInert(this, inert);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
})();
|
||
|
|
|
||
|
|
})));
|