1 files changed, 0 insertions, 436 deletions
diff --git a/application/palemoon/modules/BrowserNewTabPreloader.jsm b/application/palemoon/modules/BrowserNewTabPreloader.jsm
deleted file mode 100644
index 778698fbaa..0000000000
--- a/application/palemoon/modules/BrowserNewTabPreloader.jsm
+++ /dev/null
@@ -1,436 +0,0 @@
-/* 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/. */
-
-"use strict";
-
-this.EXPORTED_SYMBOLS = ["BrowserNewTabPreloader"];
-
-const Cu = Components.utils;
-const Cc = Components.classes;
-const Ci = Components.interfaces;
-
-Cu.import("resource://gre/modules/Services.jsm");
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-Cu.import("resource://gre/modules/Promise.jsm");
-
-const HTML_NS = "http://www.w3.org/1999/xhtml";
-const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
-const XUL_PAGE = "data:application/vnd.mozilla.xul+xml;charset=utf-8,<window%20id='win'/>";
-const NEWTAB_URL = "about:newtab";
-const PREF_BRANCH = "browser.newtab.";
-
-// The interval between swapping in a preload docShell and kicking off the
-// next preload in the background.
-const PRELOADER_INTERVAL_MS = 600;
-// The initial delay before we start preloading our first new tab page. The
-// timer is started after the first 'browser-delayed-startup' has been sent.
-const PRELOADER_INIT_DELAY_MS = 5000;
-// The number of miliseconds we'll wait after we received a notification that
-// causes us to update our list of browsers and tabbrowser sizes. This acts as
-// kind of a damper when too many events are occuring in quick succession.
-const PRELOADER_UPDATE_DELAY_MS = 3000;
-
-const TOPIC_TIMER_CALLBACK = "timer-callback";
-const TOPIC_DELAYED_STARTUP = "browser-delayed-startup-finished";
-const TOPIC_XUL_WINDOW_CLOSED = "xul-window-destroyed";
-
-function createTimer(obj, delay) {
-  let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
-  timer.init(obj, delay, Ci.nsITimer.TYPE_ONE_SHOT);
-  return timer;
-}
-
-function clearTimer(timer) {
-  if (timer) {
-    timer.cancel();
-  }
-  return null;
-}
-
-this.BrowserNewTabPreloader = {
-  init: function Preloader_init() {
-    Initializer.start();
-  },
-
-  uninit: function Preloader_uninit() {
-    Initializer.stop();
-    HostFrame.destroy();
-    Preferences.uninit();
-    HiddenBrowsers.uninit();
-  },
-
-  newTab: function Preloader_newTab(aTab) {
-    let win = aTab.ownerDocument.defaultView;
-    if (win.gBrowser) {
-      let utils = win.QueryInterface(Ci.nsIInterfaceRequestor)
-                     .getInterface(Ci.nsIDOMWindowUtils);
-
-      let {width, height} = utils.getBoundsWithoutFlushing(win.gBrowser);
-      let hiddenBrowser = HiddenBrowsers.get(width, height)
-      if (hiddenBrowser) {
-        return hiddenBrowser.swapWithNewTab(aTab);
-      }
-    }
-
-    return false;
-  }
-};
-
-Object.freeze(BrowserNewTabPreloader);
-
-var Initializer = {
-  _timer: null,
-  _observing: false,
-
-  start: function Initializer_start() {
-    Services.obs.addObserver(this, TOPIC_DELAYED_STARTUP, false);
-    this._observing = true;
-  },
-
-  stop: function Initializer_stop() {
-    this._timer = clearTimer(this._timer);
-
-    if (this._observing) {
-      Services.obs.removeObserver(this, TOPIC_DELAYED_STARTUP);
-      this._observing = false;
-    }
-  },
-
-  observe: function Initializer_observe(aSubject, aTopic, aData) {
-    if (aTopic == TOPIC_DELAYED_STARTUP) {
-      Services.obs.removeObserver(this, TOPIC_DELAYED_STARTUP);
-      this._observing = false;
-      this._startTimer();
-    } else if (aTopic == TOPIC_TIMER_CALLBACK) {
-      this._timer = null;
-      this._startPreloader();
-    }
-  },
-
-  _startTimer: function Initializer_startTimer() {
-    this._timer = createTimer(this, PRELOADER_INIT_DELAY_MS);
-  },
-
-  _startPreloader: function Initializer_startPreloader() {
-    Preferences.init();
-    if (Preferences.enabled) {
-      HiddenBrowsers.init();
-    }
-  }
-};
-
-var Preferences = {
-  _enabled: null,
-  _branch: null,
-
-  get enabled() {
-    if (this._enabled === null) {
-      this._enabled = this._branch.getBoolPref("preload") &&
-                      !this._branch.prefHasUserValue("url");
-    }
-
-    return this._enabled;
-  },
-
-  init: function Preferences_init() {
-    this._branch = Services.prefs.getBranch(PREF_BRANCH);
-    this._branch.addObserver("", this, false);
-  },
-
-  uninit: function Preferences_uninit() {
-    if (this._branch) {
-      this._branch.removeObserver("", this);
-      this._branch = null;
-    }
-  },
-
-  observe: function Preferences_observe() {
-    let prevEnabled = this._enabled;
-    this._enabled = null;
-
-    if (prevEnabled && !this.enabled) {
-      HiddenBrowsers.uninit();
-    } else if (!prevEnabled && this.enabled) {
-      HiddenBrowsers.init();
-    }
-  },
-};
-
-var HiddenBrowsers = {
-  _browsers: null,
-  _updateTimer: null,
-
-  _topics: [
-    TOPIC_DELAYED_STARTUP,
-    TOPIC_XUL_WINDOW_CLOSED
-  ],
-
-  init: function () {
-    this._browsers = new Map();
-    this._updateBrowserSizes();
-    this._topics.forEach(t => Services.obs.addObserver(this, t, false));
-  },
-
-  uninit: function () {
-    if (this._browsers) {
-      this._topics.forEach(t => Services.obs.removeObserver(this, t, false));
-      this._updateTimer = clearTimer(this._updateTimer);
-
-      for (let [key, browser] of this._browsers) {
-        browser.destroy();
-      }
-      this._browsers = null;
-    }
-  },
-
-  get: function (width, height) {
-    // We haven't been initialized, yet.
-    if (!this._browsers) {
-      return null;
-    }
-
-    let key = width + "x" + height;
-    if (!this._browsers.has(key)) {
-      // Update all browsers' sizes if we can't find a matching one.
-      this._updateBrowserSizes();
-    }
-
-    // We should now have a matching browser.
-    if (this._browsers.has(key)) {
-      return this._browsers.get(key);
-    }
-
-    // We should never be here. Return the first browser we find.
-    Cu.reportError("NewTabPreloader: no matching browser found after updating");
-    for (let [size, browser] of this._browsers) {
-      return browser;
-    }
-
-    // We should really never be here.
-    Cu.reportError("NewTabPreloader: not even a single browser was found?");
-    return null;
-  },
-
-  observe: function (subject, topic, data) {
-    if (topic === TOPIC_TIMER_CALLBACK) {
-      this._updateTimer = null;
-      this._updateBrowserSizes();
-    } else {
-      this._updateTimer = clearTimer(this._updateTimer);
-      this._updateTimer = createTimer(this, PRELOADER_UPDATE_DELAY_MS);
-    }
-  },
-
-  _updateBrowserSizes: function () {
-    let sizes = this._collectTabBrowserSizes();
-    let toRemove = [];
-
-    // Iterate all browsers and check that they
-    // each can be assigned to one of the sizes.
-    for (let [key, browser] of this._browsers) {
-      if (sizes.has(key)) {
-        // We already have a browser for that size, great!
-        sizes.delete(key);
-      } else {
-        // This browser is superfluous or needs to be resized.
-        toRemove.push(browser);
-        this._browsers.delete(key);
-      }
-    }
-
-    // Iterate all sizes that we couldn't find a browser for.
-    for (let [key, {width, height}] of sizes) {
-      let browser;
-      if (toRemove.length) {
-        // Let's just resize one of the superfluous
-        // browsers and put it back into the map.
-        browser = toRemove.shift();
-        browser.resize(width, height);
-      } else {
-        // No more browsers to reuse, create a new one.
-        browser = new HiddenBrowser(width, height);
-      }
-
-      this._browsers.set(key, browser);
-    }
-
-    // Finally, remove all browsers we don't need anymore.
-    toRemove.forEach(b => b.destroy());
-  },
-
-  _collectTabBrowserSizes: function () {
-    let sizes = new Map();
-
-    function tabBrowserBounds() {
-      let wins = Services.ww.getWindowEnumerator("navigator:browser");
-      while (wins.hasMoreElements()) {
-        let win = wins.getNext();
-        if (win.gBrowser) {
-          let utils = win.QueryInterface(Ci.nsIInterfaceRequestor)
-                         .getInterface(Ci.nsIDOMWindowUtils);
-          yield utils.getBoundsWithoutFlushing(win.gBrowser);
-        }
-      }
-    }
-
-    // Collect the sizes of all <tabbrowser>s out there.
-    for (let {width, height} of tabBrowserBounds()) {
-      if (width > 0 && height > 0) {
-        let key = width + "x" + height;
-        if (!sizes.has(key)) {
-          sizes.set(key, {width: width, height: height});
-        }
-      }
-    }
-
-    return sizes;
-  }
-};
-
-function HiddenBrowser(width, height) {
-  this.resize(width, height);
-
-  HostFrame.get().then(aFrame => {
-    let doc = aFrame.document;
-    this._browser = doc.createElementNS(XUL_NS, "browser");
-    this._browser.setAttribute("type", "content");
-    this._browser.setAttribute("src", NEWTAB_URL);
-    this._applySize();
-    doc.getElementById("win").appendChild(this._browser);
-  });
-}
-
-HiddenBrowser.prototype = {
-  _width: null,
-  _height: null,
-  _timer: null,
-  _needsFrameScripts: true,
-
-  get isPreloaded() {
-    return this._browser &&
-           this._browser.contentDocument &&
-           this._browser.contentDocument.readyState === "complete" &&
-           this._browser.currentURI.spec === NEWTAB_URL;
-  },
-
-  swapWithNewTab: function (aTab) {
-    if (!this.isPreloaded || this._timer) {
-      return false;
-    }
-
-    let win = aTab.ownerDocument.defaultView;
-    let tabbrowser = win.gBrowser;
-
-    if (!tabbrowser) {
-      return false;
-    }
-
-    // Swap docShells.
-    tabbrowser.swapNewTabWithBrowser(aTab, this._browser);
-
-    // Load all default frame scripts.
-    if (this._needsFrameScripts) {
-      this._needsFrameScripts = false;
-
-      let mm = aTab.linkedBrowser.messageManager;
-      mm.loadFrameScript("chrome://browser/content/content.js", true);
-      mm.loadFrameScript("chrome://browser/content/content-sessionStore.js", true);
-
-      if ("TabView" in win) {
-        mm.loadFrameScript("chrome://browser/content/tabview-content.js", true);
-      }
-    }
-
-    // Start a timer that will kick off preloading the next newtab page.
-    this._timer = createTimer(this, PRELOADER_INTERVAL_MS);
-
-    // Signal that we swapped docShells.
-    return true;
-  },
-
-  observe: function () {
-    this._timer = null;
-
-    // Start pre-loading the new tab page.
-    this._browser.loadURI(NEWTAB_URL);
-  },
-
-  resize: function (width, height) {
-    this._width = width;
-    this._height = height;
-    this._applySize();
-  },
-
-  _applySize: function () {
-    if (this._browser) {
-      this._browser.style.width = this._width + "px";
-      this._browser.style.height = this._height + "px";
-    }
-  },
-
-  destroy: function () {
-    if (this._browser) {
-      this._browser.remove();
-      this._browser = null;
-    }
-
-    this._timer = clearTimer(this._timer);
-  }
-};
-
-var HostFrame = {
-  _frame: null,
-  _deferred: null,
-
-  get hiddenDOMDocument() {
-    return Services.appShell.hiddenDOMWindow.document;
-  },
-
-  get isReady() {
-    return this.hiddenDOMDocument.readyState === "complete";
-  },
-
-  get: function () {
-    if (!this._deferred) {
-      this._deferred = Promise.defer();
-      this._create();
-    }
-
-    return this._deferred.promise;
-  },
-
-  destroy: function () {
-    if (this._frame) {
-      if (!Cu.isDeadWrapper(this._frame)) {
-        this._frame.removeEventListener("load", this, true);
-        this._frame.remove();
-      }
-
-      this._frame = null;
-      this._deferred = null;
-    }
-  },
-
-  handleEvent: function () {
-    let contentWindow = this._frame.contentWindow;
-    if (contentWindow.location.href === XUL_PAGE) {
-      this._frame.removeEventListener("load", this, true);
-      this._deferred.resolve(contentWindow);
-    } else {
-      contentWindow.location = XUL_PAGE;
-    }
-  },
-
-  _create: function () {
-    if (this.isReady) {
-      let doc = this.hiddenDOMDocument;
-      this._frame = doc.createElementNS(HTML_NS, "iframe");
-      this._frame.addEventListener("load", this, true);
-      doc.documentElement.appendChild(this._frame);
-    } else {
-      let flags = Ci.nsIThread.DISPATCH_NORMAL;
-      Services.tm.currentThread.dispatch(() => this._create(), flags);
-    }
-  }
-};