summaryrefslogtreecommitdiffstats
path: root/toolkit/content/customElements.js
diff options
context:
space:
mode:
Diffstat (limited to 'toolkit/content/customElements.js')
-rw-r--r--toolkit/content/customElements.js873
1 files changed, 873 insertions, 0 deletions
diff --git a/toolkit/content/customElements.js b/toolkit/content/customElements.js
new file mode 100644
index 0000000000..06e516be41
--- /dev/null
+++ b/toolkit/content/customElements.js
@@ -0,0 +1,873 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This file defines these globals on the window object.
+// Define them here so that ESLint can find them:
+/* globals MozXULElement, MozHTMLElement, MozElements */
+
+"use strict";
+
+// This is loaded into chrome windows with the subscript loader. Wrap in
+// a block to prevent accidentally leaking globals onto `window`.
+(() => {
+ // Handle customElements.js being loaded as a script in addition to the subscriptLoader
+ // from MainProcessSingleton, to handle pages that can open both before and after
+ // MainProcessSingleton starts. See Bug 1501845.
+ if (window.MozXULElement) {
+ return;
+ }
+
+ const MozElements = {};
+ window.MozElements = MozElements;
+
+ const { AppConstants } = ChromeUtils.importESModule(
+ "resource://gre/modules/AppConstants.sys.mjs"
+ );
+ const instrumentClasses = Services.env.get("MOZ_INSTRUMENT_CUSTOM_ELEMENTS");
+ const instrumentedClasses = instrumentClasses ? new Set() : null;
+ const instrumentedBaseClasses = instrumentClasses ? new WeakSet() : null;
+
+ // If requested, wrap the normal customElements.define to give us a chance
+ // to modify the class so we can instrument function calls in local development:
+ if (instrumentClasses) {
+ let define = window.customElements.define;
+ window.customElements.define = function (name, c, opts) {
+ instrumentCustomElementClass(c);
+ return define.call(this, name, c, opts);
+ };
+ window.addEventListener(
+ "load",
+ () => {
+ MozElements.printInstrumentation(true);
+ },
+ { once: true, capture: true }
+ );
+ }
+
+ MozElements.printInstrumentation = function (collapsed) {
+ let summaries = [];
+ let totalCalls = 0;
+ let totalTime = 0;
+ for (let c of instrumentedClasses) {
+ // Allow passing in something like MOZ_INSTRUMENT_CUSTOM_ELEMENTS=MozXULElement,Button to filter
+ let includeClass =
+ instrumentClasses == 1 ||
+ instrumentClasses
+ .split(",")
+ .some(n => c.name.toLowerCase().includes(n.toLowerCase()));
+ let summary = c.__instrumentation_summary;
+ if (includeClass && summary) {
+ summaries.push(summary);
+ totalCalls += summary.totalCalls;
+ totalTime += summary.totalTime;
+ }
+ }
+ if (summaries.length) {
+ let groupName = `Instrumentation data for custom elements in ${document.documentURI}`;
+ console[collapsed ? "groupCollapsed" : "group"](groupName);
+ console.log(
+ `Total function calls ${totalCalls} and total time spent inside ${totalTime.toFixed(
+ 2
+ )}`
+ );
+ for (let summary of summaries) {
+ console.log(`${summary.name} (# instances: ${summary.instances})`);
+ if (Object.keys(summary.data).length > 1) {
+ console.table(summary.data);
+ }
+ }
+ console.groupEnd(groupName);
+ }
+ };
+
+ function instrumentCustomElementClass(c) {
+ // Climb up prototype chain to see if we inherit from a MozElement.
+ // Keep track of classes to instrument, for example:
+ // MozMenuCaption->MozMenuBase->BaseText->BaseControl->MozXULElement
+ let inheritsFromBase = instrumentedBaseClasses.has(c);
+ let classesToInstrument = [c];
+ let proto = Object.getPrototypeOf(c);
+ while (proto) {
+ classesToInstrument.push(proto);
+ if (instrumentedBaseClasses.has(proto)) {
+ inheritsFromBase = true;
+ break;
+ }
+ proto = Object.getPrototypeOf(proto);
+ }
+
+ if (inheritsFromBase) {
+ for (let c of classesToInstrument.reverse()) {
+ instrumentIndividualClass(c);
+ }
+ }
+ }
+
+ function instrumentIndividualClass(c) {
+ if (instrumentedClasses.has(c)) {
+ return;
+ }
+
+ instrumentedClasses.add(c);
+ let data = { instances: 0 };
+
+ function wrapFunction(name, fn) {
+ return function () {
+ if (!data[name]) {
+ data[name] = { time: 0, calls: 0 };
+ }
+ data[name].calls++;
+ let n = performance.now();
+ let r = fn.apply(this, arguments);
+ data[name].time += performance.now() - n;
+ return r;
+ };
+ }
+ function wrapPropertyDescriptor(obj, name) {
+ if (name == "constructor") {
+ return;
+ }
+ let prop = Object.getOwnPropertyDescriptor(obj, name);
+ if (prop.get) {
+ prop.get = wrapFunction(`<get> ${name}`, prop.get);
+ }
+ if (prop.set) {
+ prop.set = wrapFunction(`<set> ${name}`, prop.set);
+ }
+ if (prop.writable && prop.value && prop.value.apply) {
+ prop.value = wrapFunction(name, prop.value);
+ }
+ Object.defineProperty(obj, name, prop);
+ }
+
+ // Handle static properties
+ for (let name of Object.getOwnPropertyNames(c)) {
+ wrapPropertyDescriptor(c, name);
+ }
+
+ // Handle instance properties
+ for (let name of Object.getOwnPropertyNames(c.prototype)) {
+ wrapPropertyDescriptor(c.prototype, name);
+ }
+
+ c.__instrumentation_data = data;
+ Object.defineProperty(c, "__instrumentation_summary", {
+ enumerable: false,
+ configurable: false,
+ get() {
+ if (data.instances == 0) {
+ return null;
+ }
+
+ let clonedData = JSON.parse(JSON.stringify(data));
+ delete clonedData.instances;
+ let totalCalls = 0;
+ let totalTime = 0;
+ for (let d in clonedData) {
+ let { time, calls } = clonedData[d];
+ time = parseFloat(time.toFixed(2));
+ totalCalls += calls;
+ totalTime += time;
+ clonedData[d]["time (ms)"] = time;
+ delete clonedData[d].time;
+ clonedData[d].timePerCall = parseFloat((time / calls).toFixed(4));
+ }
+
+ let timePerCall = parseFloat((totalTime / totalCalls).toFixed(4));
+ totalTime = parseFloat(totalTime.toFixed(2));
+
+ // Add a spaced-out final row with summed up totals
+ clonedData["\ntotals"] = {
+ "time (ms)": `\n${totalTime}`,
+ calls: `\n${totalCalls}`,
+ timePerCall: `\n${timePerCall}`,
+ };
+ return {
+ instances: data.instances,
+ data: clonedData,
+ name: c.name,
+ totalCalls,
+ totalTime,
+ };
+ },
+ });
+ }
+
+ // The listener of DOMContentLoaded must be set on window, rather than
+ // document, because the window can go away before the event is fired.
+ // In that case, we don't want to initialize anything, otherwise we
+ // may be leaking things because they will never be destroyed after.
+ let gIsDOMContentLoaded = false;
+ const gElementsPendingConnection = new Set();
+ window.addEventListener(
+ "DOMContentLoaded",
+ () => {
+ gIsDOMContentLoaded = true;
+ for (let element of gElementsPendingConnection) {
+ try {
+ if (element.isConnected) {
+ element.isRunningDelayedConnectedCallback = true;
+ element.connectedCallback();
+ }
+ } catch (ex) {
+ console.error(ex);
+ }
+ element.isRunningDelayedConnectedCallback = false;
+ }
+ gElementsPendingConnection.clear();
+ },
+ { once: true, capture: true }
+ );
+
+ const gXULDOMParser = new DOMParser();
+ gXULDOMParser.forceEnableXULXBL();
+
+ MozElements.MozElementMixin = Base => {
+ let MozElementBase = class extends Base {
+ constructor() {
+ super();
+
+ if (instrumentClasses) {
+ let proto = this.constructor;
+ while (proto && proto != Base) {
+ proto.__instrumentation_data.instances++;
+ proto = Object.getPrototypeOf(proto);
+ }
+ }
+ }
+ /*
+ * A declarative way to wire up attribute inheritance and automatically generate
+ * the `observedAttributes` getter. For example, if you returned:
+ * {
+ * ".foo": "bar,baz=bat"
+ * }
+ *
+ * Then the base class will automatically return ["bar", "bat"] from `observedAttributes`,
+ * and set up an `attributeChangedCallback` to pass those attributes down onto an element
+ * matching the ".foo" selector.
+ *
+ * See the `inheritAttribute` function for more details on the attribute string format.
+ *
+ * @return {Object<string selector, string attributes>}
+ */
+ static get inheritedAttributes() {
+ return null;
+ }
+
+ static get flippedInheritedAttributes() {
+ // Have to be careful here, if a subclass overrides inheritedAttributes
+ // and its parent class is instantiated first, then reading
+ // this._flippedInheritedAttributes on the child class will return the
+ // computed value from the parent. We store it separately on each class
+ // to ensure everything works correctly when inheritedAttributes is
+ // overridden.
+ if (!this.hasOwnProperty("_flippedInheritedAttributes")) {
+ let { inheritedAttributes } = this;
+ if (!inheritedAttributes) {
+ this._flippedInheritedAttributes = null;
+ } else {
+ this._flippedInheritedAttributes = {};
+ for (let selector in inheritedAttributes) {
+ let attrRules = inheritedAttributes[selector].split(",");
+ for (let attrRule of attrRules) {
+ let attrName = attrRule;
+ let attrNewName = attrRule;
+ let split = attrName.split("=");
+ if (split.length == 2) {
+ attrName = split[1];
+ attrNewName = split[0];
+ }
+
+ if (!this._flippedInheritedAttributes[attrName]) {
+ this._flippedInheritedAttributes[attrName] = [];
+ }
+ this._flippedInheritedAttributes[attrName].push([
+ selector,
+ attrNewName,
+ ]);
+ }
+ }
+ }
+ }
+
+ return this._flippedInheritedAttributes;
+ }
+ /*
+ * Generate this array based on `inheritedAttributes`, if any. A class is free to override
+ * this if it needs to do something more complex or wants to opt out of this behavior.
+ */
+ static get observedAttributes() {
+ return Object.keys(this.flippedInheritedAttributes || {});
+ }
+
+ /*
+ * Provide default lifecycle callback for attribute changes that will inherit attributes
+ * based on the static `inheritedAttributes` Object. This can be overridden by callers.
+ */
+ attributeChangedCallback(name, oldValue, newValue) {
+ if (oldValue === newValue || !this.initializedAttributeInheritance) {
+ return;
+ }
+
+ let list = this.constructor.flippedInheritedAttributes[name];
+ if (list) {
+ this.inheritAttribute(list, name);
+ }
+ }
+
+ /*
+ * After setting content, calling this will cache the elements from selectors in the
+ * static `inheritedAttributes` Object. It'll also do an initial call to `this.inheritAttributes()`,
+ * so in the simple case, this is the only function you need to call.
+ *
+ * This should be called any time the children that are inheriting attributes changes. For instance,
+ * it's common in a connectedCallback to do something like:
+ *
+ * this.textContent = "";
+ * this.append(MozXULElement.parseXULToFragment(`<label />`))
+ * this.initializeAttributeInheritance();
+ *
+ */
+ initializeAttributeInheritance() {
+ let { flippedInheritedAttributes } = this.constructor;
+ if (!flippedInheritedAttributes) {
+ return;
+ }
+
+ // Clear out any existing cached elements:
+ this._inheritedElements = null;
+
+ this.initializedAttributeInheritance = true;
+ for (let attr in flippedInheritedAttributes) {
+ if (this.hasAttribute(attr)) {
+ this.inheritAttribute(flippedInheritedAttributes[attr], attr);
+ }
+ }
+ }
+
+ /*
+ * Implements attribute value inheritance by child elements.
+ *
+ * @param {array} list
+ * An array of (to-element-selector, to-attr) pairs.
+ * @param {string} attr
+ * An attribute to propagate.
+ */
+ inheritAttribute(list, attr) {
+ if (!this._inheritedElements) {
+ this._inheritedElements = {};
+ }
+
+ let hasAttr = this.hasAttribute(attr);
+ let attrValue = this.getAttribute(attr);
+
+ for (let [selector, newAttr] of list) {
+ if (!(selector in this._inheritedElements)) {
+ this._inheritedElements[selector] =
+ this.getElementForAttrInheritance(selector);
+ }
+ let el = this._inheritedElements[selector];
+ if (el) {
+ if (newAttr == "text") {
+ el.textContent = hasAttr ? attrValue : "";
+ } else if (hasAttr) {
+ el.setAttribute(newAttr, attrValue);
+ } else {
+ el.removeAttribute(newAttr);
+ }
+ }
+ }
+ }
+
+ /**
+ * Used in setting up attribute inheritance. Takes a selector and returns
+ * an element for that selector from shadow DOM if there is a shadowRoot,
+ * or from the light DOM if not.
+ *
+ * Here's one problem this solves. ElementB extends ElementA which extends
+ * MozXULElement. ElementA has a shadowRoot. ElementB tries to inherit
+ * attributes in light DOM by calling `initializeAttributeInheritance`
+ * but that fails because it defaults to inheriting from the shadow DOM
+ * and not the light DOM. (See bug 1545824.)
+ *
+ * To solve this, ElementB can override `getElementForAttrInheritance` so
+ * it queries the light DOM for some selectors as needed. For example:
+ *
+ * class ElementA extends MozXULElement {
+ * static get inheritedAttributes() {
+ * return { ".one": "attr" };
+ * }
+ * }
+ *
+ * class ElementB extends customElements.get("elementa") {
+ * static get inheritedAttributes() {
+ * return Object.assign({}, super.inheritedAttributes(), {
+ * ".two": "attr",
+ * });
+ * }
+ * getElementForAttrInheritance(selector) {
+ * if (selector == ".two") {
+ * return this.querySelector(selector)
+ * } else {
+ * return super.getElementForAttrInheritance(selector);
+ * }
+ * }
+ * }
+ *
+ * @param {string} selector
+ * A selector used to query an element.
+ *
+ * @return {Element} The element found by the selector.
+ */
+ getElementForAttrInheritance(selector) {
+ let parent = this.shadowRoot || this;
+ return parent.querySelector(selector);
+ }
+
+ /**
+ * Sometimes an element may not want to run connectedCallback logic during
+ * parse. This could be because we don't want to initialize the element before
+ * the element's contents have been fully parsed, or for performance reasons.
+ * If you'd like to opt-in to this, then add this to the beginning of your
+ * `connectedCallback` and `disconnectedCallback`:
+ *
+ * if (this.delayConnectedCallback()) { return }
+ *
+ * And this at the beginning of your `attributeChangedCallback`
+ *
+ * if (!this.isConnectedAndReady) { return; }
+ */
+ delayConnectedCallback() {
+ if (gIsDOMContentLoaded) {
+ return false;
+ }
+ gElementsPendingConnection.add(this);
+ return true;
+ }
+
+ get isConnectedAndReady() {
+ return gIsDOMContentLoaded && this.isConnected;
+ }
+
+ /**
+ * Passes DOM events to the on_<event type> methods.
+ */
+ handleEvent(event) {
+ let methodName = "on_" + event.type;
+ if (methodName in this) {
+ this[methodName](event);
+ } else {
+ throw new Error("Unrecognized event: " + event.type);
+ }
+ }
+
+ /**
+ * Used by custom elements for caching fragments. We now would be
+ * caching once per class while also supporting subclasses.
+ *
+ * If available, returns the cached fragment.
+ * Otherwise, creates it.
+ *
+ * Example:
+ *
+ * class ElementA extends MozXULElement {
+ * static get markup() {
+ * return `<hbox class="example"`;
+ * }
+ *
+ * connectedCallback() {
+ * this.appendChild(this.constructor.fragment);
+ * }
+ * }
+ *
+ * @return {importedNode} The imported node that has not been
+ * inserted into document tree.
+ */
+ static get fragment() {
+ if (!this.hasOwnProperty("_fragment")) {
+ let markup = this.markup;
+ if (markup) {
+ this._fragment = MozXULElement.parseXULToFragment(
+ markup,
+ this.entities
+ );
+ } else {
+ throw new Error("Markup is null");
+ }
+ }
+ return document.importNode(this._fragment, true);
+ }
+
+ /**
+ * Allows eager deterministic construction of XUL elements with XBL attached, by
+ * parsing an element tree and returning a DOM fragment to be inserted in the
+ * document before any of the inner elements is referenced by JavaScript.
+ *
+ * This process is required instead of calling the createElement method directly
+ * because bindings get attached when:
+ *
+ * 1. the node gets a layout frame constructed, or
+ * 2. the node gets its JavaScript reflector created, if it's in the document,
+ *
+ * whichever happens first. The createElement method would return a JavaScript
+ * reflector, but the element wouldn't be in the document, so the node wouldn't
+ * get XBL attached. After that point, even if the node is inserted into a
+ * document, it won't get XBL attached until either the frame is constructed or
+ * the reflector is garbage collected and the element is touched again.
+ *
+ * @param {string} str
+ * String with the XML representation of XUL elements.
+ * @param {string[]} [entities]
+ * An array of DTD URLs containing entity definitions.
+ *
+ * @return {DocumentFragment} `DocumentFragment` instance containing
+ * the corresponding element tree, including element nodes
+ * but excluding any text node.
+ */
+ static parseXULToFragment(str, entities = []) {
+ let doc = gXULDOMParser.parseFromSafeString(
+ `
+ ${
+ entities.length
+ ? `<!DOCTYPE bindings [
+ ${entities.reduce((preamble, url, index) => {
+ return (
+ preamble +
+ `<!ENTITY % _dtd-${index} SYSTEM "${url}">
+ %_dtd-${index};
+ `
+ );
+ }, "")}
+ ]>`
+ : ""
+ }
+ <box xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+ xmlns:html="http://www.w3.org/1999/xhtml">
+ ${str}
+ </box>
+ `,
+ "application/xml"
+ );
+
+ if (doc.documentElement.localName === "parsererror") {
+ throw new Error("not well-formed XML");
+ }
+
+ // The XUL/XBL parser is set to ignore all-whitespace nodes, whereas (X)HTML
+ // does not do this. Most XUL code assumes that the whitespace has been
+ // stripped out, so we simply remove all text nodes after using the parser.
+ let nodeIterator = doc.createNodeIterator(doc, NodeFilter.SHOW_TEXT);
+ let currentNode = nodeIterator.nextNode();
+ while (currentNode) {
+ // Remove whitespace-only nodes. Regex is taken from:
+ // https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Whitespace_in_the_DOM
+ if (!/[^\t\n\r ]/.test(currentNode.textContent)) {
+ currentNode.remove();
+ }
+
+ currentNode = nodeIterator.nextNode();
+ }
+ // We use a range here so that we don't access the inner DOM elements from
+ // JavaScript before they are imported and inserted into a document.
+ let range = doc.createRange();
+ range.selectNodeContents(doc.querySelector("box"));
+ return range.extractContents();
+ }
+
+ /**
+ * Insert a localization link to an FTL file. This is used so that
+ * a Custom Element can wait to inject the link until it's connected,
+ * and so that consuming documents don't require the correct <link>
+ * present in the markup.
+ *
+ * @param path
+ * The path to the FTL file
+ */
+ static insertFTLIfNeeded(path) {
+ let container = document.head || document.querySelector("linkset");
+ if (!container) {
+ if (
+ document.documentElement.namespaceURI ===
+ "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+ ) {
+ container = document.createXULElement("linkset");
+ document.documentElement.appendChild(container);
+ } else if (document.documentURI == AppConstants.BROWSER_CHROME_URL) {
+ // Special case for browser.xhtml. Here `document.head` is null, so
+ // just insert the link at the end of the window.
+ container = document.documentElement;
+ } else {
+ throw new Error(
+ "Attempt to inject localization link before document.head is available"
+ );
+ }
+ }
+
+ for (let link of container.querySelectorAll("link")) {
+ if (link.getAttribute("href") == path) {
+ return;
+ }
+ }
+
+ let link = document.createElementNS(
+ "http://www.w3.org/1999/xhtml",
+ "link"
+ );
+ link.setAttribute("rel", "localization");
+ link.setAttribute("href", path);
+
+ container.appendChild(link);
+ }
+
+ /**
+ * Indicate that a class defining a XUL element implements one or more
+ * XPCOM interfaces by adding a getCustomInterface implementation to it,
+ * as well as an implementation of QueryInterface.
+ *
+ * The supplied class should implement the properties and methods of
+ * all of the interfaces that are specified.
+ *
+ * @param cls
+ * The class that implements the interface.
+ * @param names
+ * Array of interface names.
+ */
+ static implementCustomInterface(cls, ifaces) {
+ if (cls.prototype.customInterfaces) {
+ ifaces.push(...cls.prototype.customInterfaces);
+ }
+ cls.prototype.customInterfaces = ifaces;
+
+ cls.prototype.QueryInterface = ChromeUtils.generateQI(ifaces);
+ cls.prototype.getCustomInterfaceCallback =
+ function getCustomInterfaceCallback(ifaceToCheck) {
+ if (
+ cls.prototype.customInterfaces.some(iface =>
+ iface.equals(ifaceToCheck)
+ )
+ ) {
+ return getInterfaceProxy(this);
+ }
+ return null;
+ };
+ }
+ };
+
+ // Rename the class so we can distinguish between MozXULElement and MozXULPopupElement, for example.
+ Object.defineProperty(MozElementBase, "name", { value: `Moz${Base.name}` });
+ if (instrumentedBaseClasses) {
+ instrumentedBaseClasses.add(MozElementBase);
+ }
+ return MozElementBase;
+ };
+
+ const MozXULElement = MozElements.MozElementMixin(XULElement);
+ const MozHTMLElement = MozElements.MozElementMixin(HTMLElement);
+
+ /**
+ * Given an object, add a proxy that reflects interface implementations
+ * onto the object itself.
+ */
+ function getInterfaceProxy(obj) {
+ /* globals MozQueryInterface */
+ if (!obj._customInterfaceProxy) {
+ obj._customInterfaceProxy = new Proxy(obj, {
+ get(target, prop, receiver) {
+ let propOrMethod = target[prop];
+ if (typeof propOrMethod == "function") {
+ if (MozQueryInterface.isInstance(propOrMethod)) {
+ return Reflect.get(target, prop, receiver);
+ }
+ return function (...args) {
+ return propOrMethod.apply(target, args);
+ };
+ }
+ return propOrMethod;
+ },
+ });
+ }
+
+ return obj._customInterfaceProxy;
+ }
+
+ MozElements.BaseControlMixin = Base => {
+ class BaseControl extends Base {
+ get disabled() {
+ return this.getAttribute("disabled") == "true";
+ }
+
+ set disabled(val) {
+ if (val) {
+ this.setAttribute("disabled", "true");
+ } else {
+ this.removeAttribute("disabled");
+ }
+ }
+
+ get tabIndex() {
+ return parseInt(this.getAttribute("tabindex")) || 0;
+ }
+
+ set tabIndex(val) {
+ if (val) {
+ this.setAttribute("tabindex", val);
+ } else {
+ this.removeAttribute("tabindex");
+ }
+ }
+ }
+
+ MozXULElement.implementCustomInterface(BaseControl, [
+ Ci.nsIDOMXULControlElement,
+ ]);
+ return BaseControl;
+ };
+ MozElements.BaseControl = MozElements.BaseControlMixin(MozXULElement);
+
+ const BaseTextMixin = Base =>
+ class BaseText extends MozElements.BaseControlMixin(Base) {
+ set label(val) {
+ this.setAttribute("label", val);
+ }
+
+ get label() {
+ return this.getAttribute("label");
+ }
+
+ set image(val) {
+ this.setAttribute("image", val);
+ }
+
+ get image() {
+ return this.getAttribute("image");
+ }
+
+ set command(val) {
+ this.setAttribute("command", val);
+ }
+
+ get command() {
+ return this.getAttribute("command");
+ }
+
+ set accessKey(val) {
+ // Always store on the control
+ this.setAttribute("accesskey", val);
+ // If there is a label, change the accesskey on the labelElement
+ // if it's also set there
+ if (this.labelElement) {
+ this.labelElement.accessKey = val;
+ }
+ }
+
+ get accessKey() {
+ return this.labelElement
+ ? this.labelElement.accessKey
+ : this.getAttribute("accesskey");
+ }
+ };
+ MozElements.BaseTextMixin = BaseTextMixin;
+ MozElements.BaseText = BaseTextMixin(MozXULElement);
+
+ // Attach the base class to the window so other scripts can use it:
+ window.MozXULElement = MozXULElement;
+ window.MozHTMLElement = MozHTMLElement;
+
+ customElements.setElementCreationCallback("browser", () => {
+ Services.scriptloader.loadSubScript(
+ "chrome://global/content/elements/browser-custom-element.js",
+ window
+ );
+ });
+
+ // Skip loading any extra custom elements in the extension dummy document
+ // and GeckoView windows.
+ const loadExtraCustomElements = !(
+ document.documentURI == "chrome://extensions/content/dummy.xhtml" ||
+ document.documentURI == "chrome://geckoview/content/geckoview.xhtml"
+ );
+ if (loadExtraCustomElements) {
+ for (let [tag, script] of [
+ ["button-group", "chrome://global/content/elements/named-deck.js"],
+ ["findbar", "chrome://global/content/elements/findbar.js"],
+ ["menulist", "chrome://global/content/elements/menulist.js"],
+ ["message-bar", "chrome://global/content/elements/message-bar.js"],
+ ["named-deck", "chrome://global/content/elements/named-deck.js"],
+ ["named-deck-button", "chrome://global/content/elements/named-deck.js"],
+ ["panel-list", "chrome://global/content/elements/panel-list.js"],
+ ["search-textbox", "chrome://global/content/elements/search-textbox.js"],
+ ["stringbundle", "chrome://global/content/elements/stringbundle.js"],
+ [
+ "printpreview-pagination",
+ "chrome://global/content/printPreviewPagination.js",
+ ],
+ [
+ "autocomplete-input",
+ "chrome://global/content/elements/autocomplete-input.js",
+ ],
+ ["editor", "chrome://global/content/elements/editor.js"],
+ ]) {
+ customElements.setElementCreationCallback(tag, () => {
+ Services.scriptloader.loadSubScript(script, window);
+ });
+ }
+ // Bug 1813077: This is a workaround until Bug 1803810 lands
+ // which will give us the ability to load ESMs synchronously
+ // like the previous Services.scriptloader.loadSubscript() function
+ function importCustomElementFromESModule(name) {
+ switch (name) {
+ case "moz-button-group":
+ return import(
+ "chrome://global/content/elements/moz-button-group.mjs"
+ );
+ case "moz-support-link":
+ return import(
+ "chrome://global/content/elements/moz-support-link.mjs"
+ );
+ case "moz-toggle":
+ return import("chrome://global/content/elements/moz-toggle.mjs");
+ }
+ throw new Error(`Unknown custom element name (${name})`);
+ }
+
+ /*
+ This function explicitly returns null so that there is no confusion
+ about which custom elements from ES Modules have been loaded.
+ */
+ window.ensureCustomElements = function (...elementNames) {
+ return Promise.all(
+ elementNames
+ .filter(name => !customElements.get(name))
+ .map(name => importCustomElementFromESModule(name))
+ )
+ .then(() => null)
+ .catch(console.error);
+ };
+
+ for (let script of [
+ "chrome://global/content/elements/arrowscrollbox.js",
+ "chrome://global/content/elements/dialog.js",
+ "chrome://global/content/elements/general.js",
+ "chrome://global/content/elements/button.js",
+ "chrome://global/content/elements/checkbox.js",
+ "chrome://global/content/elements/menu.js",
+ "chrome://global/content/elements/menupopup.js",
+ "chrome://global/content/elements/moz-input-box.js",
+ "chrome://global/content/elements/notificationbox.js",
+ "chrome://global/content/elements/panel.js",
+ "chrome://global/content/elements/popupnotification.js",
+ "chrome://global/content/elements/radio.js",
+ "chrome://global/content/elements/richlistbox.js",
+ "chrome://global/content/elements/autocomplete-popup.js",
+ "chrome://global/content/elements/autocomplete-richlistitem.js",
+ "chrome://global/content/elements/tabbox.js",
+ "chrome://global/content/elements/text.js",
+ "chrome://global/content/elements/toolbarbutton.js",
+ "chrome://global/content/elements/tree.js",
+ "chrome://global/content/elements/wizard.js",
+ ]) {
+ Services.scriptloader.loadSubScript(script, window);
+ }
+ }
+})();