fork from https://github.com/mozilla/pdf.js.git
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262
web/menu.js
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262
web/menu.js
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/* Copyright 2025 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { noContextMenu, stopEvent } from "pdfjs-lib";
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class Menu {
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#triggeringButton;
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#menu;
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#menuItems;
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#openMenuAC = null;
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#menuAC = new AbortController();
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#lastIndex = -1;
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#onFocusOutBound = this.#onFocusOut.bind(this);
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/**
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* Create a menu for the given button.
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* @param {HTMLElement} menuContainer
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* @param {HTMLElement} triggeringButton
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* @param {Array<HTMLElement>|null} menuItems
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*/
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constructor(menuContainer, triggeringButton, menuItems) {
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this.#menu = menuContainer;
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this.#triggeringButton = triggeringButton;
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if (Array.isArray(menuItems)) {
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this.#menuItems = menuItems;
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} else {
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this.#menuItems = [];
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for (const button of this.#menu.querySelectorAll("button")) {
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this.#menuItems.push(button);
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}
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}
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this.#setUpMenu();
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}
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/**
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* Close the menu.
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*/
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#closeMenu() {
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if (!this.#openMenuAC) {
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return;
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}
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const menu = this.#menu;
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this.#triggeringButton.ariaExpanded = "false";
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this.#openMenuAC.abort();
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this.#openMenuAC = null;
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if (menu.contains(document.activeElement)) {
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// If the menu is closed while focused, focus the actions button.
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setTimeout(() => {
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if (!menu.contains(document.activeElement)) {
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this.#triggeringButton.focus();
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}
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}, 0);
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}
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this.#lastIndex = -1;
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}
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/**
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* Open the menu.
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*/
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#openMenu() {
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if (this.#openMenuAC) {
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return;
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}
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const menu = this.#menu;
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this.#triggeringButton.ariaExpanded = "true";
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this.#openMenuAC = new AbortController();
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const signal = AbortSignal.any([
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this.#menuAC.signal,
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this.#openMenuAC.signal,
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]);
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window.addEventListener(
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"pointerdown",
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({ target }) => {
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if (
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!this.#triggeringButton.contains(target) &&
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!menu.contains(target)
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) {
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this.#closeMenu();
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}
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},
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{ signal }
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);
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const closeMenu = this.#closeMenu.bind(this);
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window.addEventListener("blur", closeMenu, { signal });
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menu.addEventListener("focusout", this.#onFocusOutBound, { signal });
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}
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#onFocusOut({ relatedTarget }) {
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if (
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!this.#triggeringButton.contains(relatedTarget) &&
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!this.#menu.contains(relatedTarget)
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) {
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this.#closeMenu();
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}
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}
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/**
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* Set up the menu.
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*/
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#setUpMenu() {
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this.#triggeringButton.addEventListener("click", e => {
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if (this.#openMenuAC) {
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this.#closeMenu();
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return;
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}
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this.#openMenu();
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});
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this.#triggeringButton.addEventListener("focusout", this.#onFocusOutBound);
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const { signal } = this.#menuAC;
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this.#menu.addEventListener(
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"keydown",
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e => {
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switch (e.key) {
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case "Escape":
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this.#closeMenu();
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stopEvent(e);
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break;
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case "ArrowDown":
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this.#goToNextItem(e.target, true);
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stopEvent(e);
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break;
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case "ArrowUp":
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this.#goToNextItem(e.target, false);
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stopEvent(e);
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break;
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case "Home":
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this.#menuItems
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.find(
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item => !item.disabled && !item.classList.contains("hidden")
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)
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?.focus();
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stopEvent(e);
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break;
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case "End":
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this.#menuItems
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.findLast(
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item => !item.disabled && !item.classList.contains("hidden")
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)
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?.focus();
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stopEvent(e);
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break;
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default:
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const { key } = e;
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if (!/^\p{L}$/u.test(key)) {
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// It isn't a single letter, so ignore it.
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break;
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}
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const char = key.toLocaleLowerCase();
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this.#goToNextItem(e.target, true, item =>
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item.textContent.trim().toLowerCase().startsWith(char)
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);
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stopEvent(e);
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break;
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}
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},
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{ signal, capture: true }
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);
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this.#menu.addEventListener("contextmenu", noContextMenu, { signal });
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this.#menu.addEventListener("click", this.#closeMenu.bind(this), {
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signal,
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capture: true,
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});
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this.#triggeringButton.addEventListener(
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"keydown",
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e => {
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switch (e.key) {
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case " ":
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case "Enter":
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case "ArrowDown":
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case "Home":
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stopEvent(e);
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if (!this.#openMenuAC) {
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this.#openMenu();
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}
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this.#menuItems
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.find(
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item => !item.disabled && !item.classList.contains("hidden")
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)
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?.focus();
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break;
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case "ArrowUp":
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case "End":
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stopEvent(e);
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if (!this.#openMenuAC) {
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this.#openMenu();
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}
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this.#menuItems
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.findLast(
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item => !item.disabled && !item.classList.contains("hidden")
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)
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?.focus();
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break;
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case "Escape":
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this.#closeMenu();
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stopEvent(e);
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break;
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}
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},
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{ signal }
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);
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}
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/**
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* Go to the next/previous menu item.
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* @param {HTMLElement} element
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* @param {boolean} forward
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*/
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#goToNextItem(element, forward, check = () => true) {
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const index =
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this.#lastIndex === -1
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? this.#menuItems.indexOf(element)
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: this.#lastIndex;
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const len = this.#menuItems.length;
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const increment = forward ? 1 : len - 1;
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for (
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let i = (index + increment) % len;
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i !== index;
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i = (i + increment) % len
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) {
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const menuItem = this.#menuItems[i];
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if (
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!menuItem.disabled &&
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!menuItem.classList.contains("hidden") &&
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check(menuItem)
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) {
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menuItem.focus();
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this.#lastIndex = i;
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break;
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}
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}
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}
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destroy() {
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this.#closeMenu();
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this.#menuAC?.abort();
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this.#menuAC = null;
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}
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}
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export { Menu };
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