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/* 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/. */
export default class MenuButton extends HTMLElement {
connectedCallback() {
if (this.shadowRoot) {
return;
}
let MenuButtonTemplate = document.querySelector("#menu-button-template");
let shadowRoot = this.attachShadow({ mode: "open" });
document.l10n.connectRoot(shadowRoot);
shadowRoot.appendChild(MenuButtonTemplate.content.cloneNode(true));
for (let menuitem of this.shadowRoot.querySelectorAll(
".menuitem-button[data-supported-platforms]"
)) {
let supportedPlatforms = menuitem.dataset.supportedPlatforms
.split(",")
.map(platform => platform.trim());
if (supportedPlatforms.includes(navigator.platform)) {
menuitem.hidden = false;
}
}
this._menu = this.shadowRoot.querySelector(".menu");
this._menuButton = this.shadowRoot.querySelector(".menu-button");
this._menuButton.addEventListener("click", this);
document.addEventListener("keydown", this, true);
}
handleEvent(event) {
switch (event.type) {
case "blur": {
if (event.explicitOriginalTarget) {
let node = event.explicitOriginalTarget;
if (node.nodeType == Node.TEXT_NODE) {
node = node.parentElement;
}
if (node.closest(".menu") == this._menu) {
// Only hide the menu if focus has left the menu-button.
return;
}
}
this._hideMenu();
break;
}
case "click": {
// Skip the catch-all event listener if it was the menu-button
// that was clicked on.
if (
event.currentTarget == document.documentElement &&
event.target == this &&
event.originalTarget == this._menuButton
) {
return;
}
if (event.originalTarget == this._menuButton) {
this._toggleMenu();
if (!this._menu.hidden) {
this._menuButton.focus();
}
return;
}
let classList = event.originalTarget.classList;
if (classList.contains("menuitem-button")) {
let eventName = event.originalTarget.dataset.eventName;
const linkTrackingSource = "Elipsis_Menu";
document.dispatchEvent(
new CustomEvent(eventName, {
bubbles: true,
detail: linkTrackingSource,
})
);
// Bug 1645365: Only hide the menu when the buttons are clicked
// So that the menu isn't closed when non-buttons (e.g. separators, paddings) are clicked
this._hideMenu();
}
// Explicitly close menu at the catch-all click event (i.e. a click outside of the menu)
if (
!this._menu.contains(event.originalTarget) &&
!this._menuButton.contains(event.originalTarget)
) {
this._hideMenu();
}
break;
}
case "keydown": {
this._handleKeyDown(event);
}
}
}
_handleKeyDown(event) {
if (event.key == "Enter" && event.originalTarget == this._menuButton) {
event.preventDefault();
this._toggleMenu();
this._focusSuccessor(true);
} else if (event.key == "Escape" && !this._menu.hidden) {
this._hideMenu();
this._menuButton.focus();
} else if (
(event.key == "ArrowDown" || event.key == "ArrowUp") &&
!this._menu.hidden
) {
event.preventDefault();
this._focusSuccessor(event.key == "ArrowDown");
}
}
_focusSuccessor(next = true) {
let items = this._menu.querySelectorAll(".menuitem-button:not([hidden])");
let firstItem = items[0];
let lastItem = items[items.length - 1];
let activeItem = this.shadowRoot.activeElement;
let activeItemIndex = [...items].indexOf(activeItem);
let successor = null;
if (next) {
if (!activeItem || activeItem === lastItem) {
successor = firstItem;
} else {
successor = items[activeItemIndex + 1];
}
} else if (activeItem === this._menuButton || activeItem === firstItem) {
successor = lastItem;
} else {
successor = items[activeItemIndex - 1];
}
if (this._menu.hidden) {
this._showMenu();
}
if (successor.disabled) {
if (next) {
successor = items[activeItemIndex + 2];
} else {
successor = items[activeItemIndex - 2];
}
}
window.AboutLoginsUtils.setFocus(successor);
}
_hideMenu() {
this._menu.hidden = true;
this.removeEventListener("blur", this);
document.documentElement.removeEventListener("click", this, true);
}
_showMenu() {
this._menu.querySelector(".menuitem-import-file").hidden =
!window.AboutLoginsUtils.fileImportEnabled;
this._menu.hidden = false;
// Event listeners to close the menu
this.addEventListener("blur", this);
document.documentElement.addEventListener("click", this, true);
}
/**
* Toggles the visibility of the menu.
*/
_toggleMenu() {
let wasHidden = this._menu.hidden;
if (wasHidden) {
this._showMenu();
} else {
this._hideMenu();
}
}
}
customElements.define("menu-button", MenuButton);
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