tab-bar-visibility.js

Enable keyboard shortcuts

/* 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/. */

var TabBarVisibility = {

  _initialUpdateDone: false,

  update(force = false) {

    let isPopup = !window.toolbar.visible;

    let isTaskbarTab = document.documentElement.hasAttribute("taskbartab");

    let isSingleTabWindow = isPopup || isTaskbarTab;

    let hasVerticalTabs =

      !isSingleTabWindow &&

      Services.prefs.getBoolPref("sidebar.verticalTabs", false);

    // When `gBrowser` has not been initialized, we're opening a new window and

    // assume only a single tab is loading.

    let hasSingleTab = !gBrowser || gBrowser.visibleTabs.length == 1;

    // To prevent tabs being lost, hiding the tabs toolbar should only work

    // when only a single tab is visible or tabs are displayed elsewhere.

    let hideTabsToolbar =

      (isSingleTabWindow && hasSingleTab) || hasVerticalTabs;

    // We only want a non-customized titlebar for popups. It should not be the

    // case, but if a popup window contains more than one tab we re-enable

    // titlebar customization and display tabs.

    CustomTitlebar.allowedBy("non-popup", !(isPopup && hasSingleTab));

    // Update the browser chrome.

    let tabsToolbar = document.getElementById("TabsToolbar");

    let navbar = document.getElementById("nav-bar");

    gNavToolbox.toggleAttribute("tabs-hidden", hideTabsToolbar);

    // Should the nav-bar look and function like a titlebar?

    navbar.classList.toggle(

      "browser-titlebar",

      CustomTitlebar.enabled && hideTabsToolbar

);

    if (

      hideTabsToolbar == tabsToolbar.collapsed &&

      !force &&

      this._initialUpdateDone

) {

      // No further updates needed, `TabsToolbar` already matches the expected

      // visibilty.

      return;

    this._initialUpdateDone = true;

    tabsToolbar.collapsed = hideTabsToolbar;

    // Stylize close menu items based on tab visibility. When a window will only

    // ever have a single tab, only show the option to close the tab, and

    // simplify the text since we don't need to disambiguate from closing the window.

    document.getElementById("menu_closeWindow").hidden = hideTabsToolbar;

    document.l10n.setAttributes(

      document.getElementById("menu_close"),

      hideTabsToolbar

        ? "tabbrowser-menuitem-close"

        : "tabbrowser-menuitem-close-tab"

);

},

};