initial commit

1 files changed, 1058 insertions, 0 deletions

diff --git a/base/content/browser-tabPreviews.js b/base/content/browser-tabPreviews.js
new file mode 100644
index 0000000..e0755b8
--- /dev/null
+++ b/base/content/browser-tabPreviews.js
@@ -0,0 +1,1058 @@
+/*
+#ifdef 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/.
+#endif
+ */
+
+/**
+ * Tab previews utility, produces thumbnails
+ */
+var tabPreviews = {
+  aspectRatio: 0.5625, // 16:9
+
+  get width() {
+    delete this.width;
+    return this.width = Math.ceil(screen.availWidth / 5.75);
+  },
+
+  get height() {
+    delete this.height;
+    return this.height = Math.round(this.width * this.aspectRatio);
+  },
+
+  init: function tabPreviews_init() {
+    if (this._selectedTab)
+      return;
+    this._selectedTab = gBrowser.selectedTab;
+
+    gBrowser.tabContainer.addEventListener("TabSelect", this, false);
+    gBrowser.tabContainer.addEventListener("SSTabRestored", this, false);
+  },
+
+  get: function tabPreviews_get(aTab) {
+    let uri = aTab.linkedBrowser.currentURI.spec;
+
+    if (aTab.__thumbnail_lastURI &&
+        aTab.__thumbnail_lastURI != uri) {
+      aTab.__thumbnail = null;
+      aTab.__thumbnail_lastURI = null;
+    }
+
+    if (aTab.__thumbnail)
+      return aTab.__thumbnail;
+
+    if (aTab.getAttribute("pending") == "true") {
+      let img = new Image;
+      img.src = PageThumbs.getThumbnailURL(uri);
+      return img;
+    }
+
+    return this.capture(aTab, !aTab.hasAttribute("busy"));
+  },
+
+  capture: function tabPreviews_capture(aTab, aStore) {
+    var thumbnail = document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
+    thumbnail.mozOpaque = true;
+    thumbnail.height = this.height;
+    thumbnail.width = this.width;
+
+    var ctx = thumbnail.getContext("2d");
+    var win = aTab.linkedBrowser.contentWindow;
+    var snippetWidth = win.innerWidth * .6;
+    var scale = this.width / snippetWidth;
+    ctx.scale(scale, scale);
+    ctx.drawWindow(win, win.scrollX, win.scrollY,
+                   snippetWidth, snippetWidth * this.aspectRatio, "rgb(255,255,255)");
+
+    if (aStore &&
+        aTab.linkedBrowser /* bug 795608: the tab may got removed while drawing the thumbnail */) {
+      aTab.__thumbnail = thumbnail;
+      aTab.__thumbnail_lastURI = aTab.linkedBrowser.currentURI.spec;
+    }
+
+    return thumbnail;
+  },
+
+  handleEvent: function tabPreviews_handleEvent(event) {
+    switch (event.type) {
+      case "TabSelect":
+        if (this._selectedTab &&
+            this._selectedTab.parentNode &&
+            !this._pendingUpdate) {
+          // Generate a thumbnail for the tab that was selected.
+          // The timeout keeps the UI snappy and prevents us from generating thumbnails
+          // for tabs that will be closed. During that timeout, don't generate other
+          // thumbnails in case multiple TabSelect events occur fast in succession.
+          this._pendingUpdate = true;
+          setTimeout(function (self, aTab) {
+            self._pendingUpdate = false;
+            if (aTab.parentNode &&
+                !aTab.hasAttribute("busy") &&
+                !aTab.hasAttribute("pending"))
+              self.capture(aTab, true);
+          }, 2000, this, this._selectedTab);
+        }
+        this._selectedTab = event.target;
+        break;
+      case "SSTabRestored":
+        this.capture(event.target, true);
+        break;
+    }
+  }
+};
+
+var tabPreviewPanelHelper = {
+  opening: function (host) {
+    host.panel.hidden = false;
+
+    var handler = this._generateHandler(host);
+    host.panel.addEventListener("popupshown", handler, false);
+    host.panel.addEventListener("popuphiding", handler, false);
+
+    host._prevFocus = document.commandDispatcher.focusedElement;
+  },
+  _generateHandler: function (host) {
+    var self = this;
+    return function (event) {
+      if (event.target == host.panel) {
+        host.panel.removeEventListener(event.type, arguments.callee, false);
+        self["_" + event.type](host);
+      }
+    };
+  },
+  _popupshown: function (host) {
+    if ("setupGUI" in host)
+      host.setupGUI();
+  },
+  _popuphiding: function (host) {
+    if ("suspendGUI" in host)
+      host.suspendGUI();
+
+    if (host._prevFocus) {
+      Cc["@mozilla.org/focus-manager;1"]
+        .getService(Ci.nsIFocusManager)
+        .setFocus(host._prevFocus, Ci.nsIFocusManager.FLAG_NOSCROLL);
+      host._prevFocus = null;
+    } else
+      gBrowser.selectedBrowser.focus();
+
+    if (host.tabToSelect) {
+      gBrowser.selectedTab = host.tabToSelect;
+      host.tabToSelect = null;
+    }
+  }
+};
+
+/**
+ * Ctrl-Tab panel
+ */
+var ctrlTab = {
+  get panel () {
+    delete this.panel;
+    return this.panel = document.getElementById("ctrlTab-panel");
+  },
+  get showAllButton () {
+    delete this.showAllButton;
+    return this.showAllButton = document.getElementById("ctrlTab-showAll");
+  },
+  get previews () {
+    delete this.previews;
+    return this.previews = this.panel.getElementsByClassName("ctrlTab-preview");
+  },
+  get recentlyUsedLimit () {
+    delete this.recentlyUsedLimit;
+    return this.recentlyUsedLimit = gPrefService.getIntPref("browser.ctrlTab.recentlyUsedLimit");
+  },
+  get keys () {
+    var keys = {};
+    ["close", "find", "selectAll"].forEach(function (key) {
+      keys[key] = document.getElementById("key_" + key)
+                          .getAttribute("key")
+                          .toLocaleLowerCase().charCodeAt(0);
+    });
+    delete this.keys;
+    return this.keys = keys;
+  },
+  _selectedIndex: 0,
+  get selected () this._selectedIndex < 0 ?
+                    document.activeElement :
+                    this.previews.item(this._selectedIndex),
+  get isOpen   () this.panel.state == "open" || this.panel.state == "showing" || this._timer,
+  get tabCount () this.tabList.length,
+  get tabPreviewCount () Math.min(this.previews.length - 1, this.tabCount),
+  get canvasWidth () Math.min(tabPreviews.width,
+                              Math.ceil(screen.availWidth * .85 / this.tabPreviewCount)),
+  get canvasHeight () Math.round(this.canvasWidth * tabPreviews.aspectRatio),
+
+  get tabList () {
+    if (this._tabList)
+      return this._tabList;
+
+    // Using gBrowser.tabs instead of gBrowser.visibleTabs, as the latter
+    // exlcudes closing tabs, breaking the following loop in case the the
+    // selected tab is closing.
+    let list = Array.filter(gBrowser.tabs, function (tab) !tab.hidden);
+
+    // Rotate the list until the selected tab is first
+    while (!list[0].selected)
+      list.push(list.shift());
+
+    list = list.filter(function (tab) !tab.closing);
+
+    if (this.recentlyUsedLimit != 0) {
+      let recentlyUsedTabs = [];
+      for (let tab of this._recentlyUsedTabs) {
+        if (!tab.hidden && !tab.closing) {
+          recentlyUsedTabs.push(tab);
+          if (this.recentlyUsedLimit > 0 && recentlyUsedTabs.length >= this.recentlyUsedLimit)
+            break;
+        }
+      }
+      for (let i = recentlyUsedTabs.length - 1; i >= 0; i--) {
+        list.splice(list.indexOf(recentlyUsedTabs[i]), 1);
+        list.unshift(recentlyUsedTabs[i]);
+      }
+    }
+
+    return this._tabList = list;
+  },
+
+  init: function ctrlTab_init() {
+    if (!this._recentlyUsedTabs) {
+      tabPreviews.init();
+
+      this._recentlyUsedTabs = [gBrowser.selectedTab];
+      this._init(true);
+    }
+  },
+
+  uninit: function ctrlTab_uninit() {
+    this._recentlyUsedTabs = null;
+    this._init(false);
+  },
+
+  prefName: "browser.ctrlTab.previews",
+  readPref: function ctrlTab_readPref() {
+    var enable =
+      gPrefService.getBoolPref(this.prefName) &&
+      (!gPrefService.prefHasUserValue("browser.ctrlTab.disallowForScreenReaders") ||
+       !gPrefService.getBoolPref("browser.ctrlTab.disallowForScreenReaders"));
+
+    if (enable)
+      this.init();
+    else
+      this.uninit();
+  },
+  observe: function (aSubject, aTopic, aPrefName) {
+    this.readPref();
+  },
+
+  updatePreviews: function ctrlTab_updatePreviews() {
+    for (let i = 0; i < this.previews.length; i++)
+      this.updatePreview(this.previews[i], this.tabList[i]);
+
+    var showAllLabel = gNavigatorBundle.getString("ctrlTab.showAll.label");
+    this.showAllButton.label =
+      PluralForm.get(this.tabCount, showAllLabel).replace("#1", this.tabCount);
+  },
+
+  updatePreview: function ctrlTab_updatePreview(aPreview, aTab) {
+    if (aPreview == this.showAllButton)
+      return;
+
+    aPreview._tab = aTab;
+
+    if (aPreview.firstChild)
+      aPreview.removeChild(aPreview.firstChild);
+    if (aTab) {
+      let canvasWidth = this.canvasWidth;
+      let canvasHeight = this.canvasHeight;
+      aPreview.appendChild(tabPreviews.get(aTab));
+      aPreview.setAttribute("label", aTab.label);
+      aPreview.setAttribute("tooltiptext", aTab.label);
+      aPreview.setAttribute("crop", aTab.crop);
+      aPreview.setAttribute("canvaswidth", canvasWidth);
+      aPreview.setAttribute("canvasstyle",
+                            "max-width:" + canvasWidth + "px;" +
+                            "min-width:" + canvasWidth + "px;" +
+                            "max-height:" + canvasHeight + "px;" +
+                            "min-height:" + canvasHeight + "px;");
+      if (aTab.image)
+        aPreview.setAttribute("image", aTab.image);
+      else
+        aPreview.removeAttribute("image");
+      aPreview.hidden = false;
+    } else {
+      aPreview.hidden = true;
+      aPreview.removeAttribute("label");
+      aPreview.removeAttribute("tooltiptext");
+      aPreview.removeAttribute("image");
+    }
+  },
+
+  advanceFocus: function ctrlTab_advanceFocus(aForward) {
+    let selectedIndex = Array.indexOf(this.previews, this.selected);
+    do {
+      selectedIndex += aForward ? 1 : -1;
+      if (selectedIndex < 0)
+        selectedIndex = this.previews.length - 1;
+      else if (selectedIndex >= this.previews.length)
+        selectedIndex = 0;
+    } while (this.previews[selectedIndex].hidden);
+
+    if (this._selectedIndex == -1) {
+      // Focus is already in the panel.
+      this.previews[selectedIndex].focus();
+    } else {
+      this._selectedIndex = selectedIndex;
+    }
+
+    if (this._timer) {
+      clearTimeout(this._timer);
+      this._timer = null;
+      this._openPanel();
+    }
+  },
+
+  _mouseOverFocus: function ctrlTab_mouseOverFocus(aPreview) {
+    if (this._trackMouseOver)
+      aPreview.focus();
+  },
+
+  pick: function ctrlTab_pick(aPreview) {
+    if (!this.tabCount)
+      return;
+
+    var select = (aPreview || this.selected);
+
+    if (select == this.showAllButton)
+      this.showAllTabs();
+    else
+      this.close(select._tab);
+  },
+
+  showAllTabs: function ctrlTab_showAllTabs(aPreview) {
+    this.close();
+    document.getElementById("Browser:ShowAllTabs").doCommand();
+  },
+
+  remove: function ctrlTab_remove(aPreview) {
+    if (aPreview._tab)
+      gBrowser.removeTab(aPreview._tab);
+  },
+
+  attachTab: function ctrlTab_attachTab(aTab, aPos) {
+    if (aPos == 0)
+      this._recentlyUsedTabs.unshift(aTab);
+    else if (aPos)
+      this._recentlyUsedTabs.splice(aPos, 0, aTab);
+    else
+      this._recentlyUsedTabs.push(aTab);
+  },
+  detachTab: function ctrlTab_detachTab(aTab) {
+    var i = this._recentlyUsedTabs.indexOf(aTab);
+    if (i >= 0)
+      this._recentlyUsedTabs.splice(i, 1);
+  },
+
+  open: function ctrlTab_open() {
+    if (this.isOpen)
+      return;
+
+    allTabs.close();
+
+    document.addEventListener("keyup", this, true);
+
+    this.updatePreviews();
+    this._selectedIndex = 1;
+
+    // Add a slight delay before showing the UI, so that a quick
+    // "ctrl-tab" keypress just flips back to the MRU tab.
+    this._timer = setTimeout(function (self) {
+      self._timer = null;
+      self._openPanel();
+    }, 200, this);
+  },
+
+  _openPanel: function ctrlTab_openPanel() {
+    tabPreviewPanelHelper.opening(this);
+
+    this.panel.width = Math.min(screen.availWidth * .99,
+                                this.canvasWidth * 1.25 * this.tabPreviewCount);
+    var estimateHeight = this.canvasHeight * 1.25 + 75;
+    this.panel.openPopupAtScreen(screen.availLeft + (screen.availWidth - this.panel.width) / 2,
+                                 screen.availTop + (screen.availHeight - estimateHeight) / 2,
+                                 false);
+  },
+
+  close: function ctrlTab_close(aTabToSelect) {
+    if (!this.isOpen)
+      return;
+
+    if (this._timer) {
+      clearTimeout(this._timer);
+      this._timer = null;
+      this.suspendGUI();
+      if (aTabToSelect)
+        gBrowser.selectedTab = aTabToSelect;
+      return;
+    }
+
+    this.tabToSelect = aTabToSelect;
+    this.panel.hidePopup();
+  },
+
+  setupGUI: function ctrlTab_setupGUI() {
+    this.selected.focus();
+    this._selectedIndex = -1;
+
+    // Track mouse movement after a brief delay so that the item that happens
+    // to be under the mouse pointer initially won't be selected unintentionally.
+    this._trackMouseOver = false;
+    setTimeout(function (self) {
+      if (self.isOpen)
+        self._trackMouseOver = true;
+    }, 0, this);
+  },
+
+  suspendGUI: function ctrlTab_suspendGUI() {
+    document.removeEventListener("keyup", this, true);
+
+    Array.forEach(this.previews, function (preview) {
+      this.updatePreview(preview, null);
+    }, this);
+
+    this._tabList = null;
+  },
+
+  onKeyPress: function ctrlTab_onKeyPress(event) {
+    var isOpen = this.isOpen;
+
+    if (isOpen) {
+      event.preventDefault();
+      event.stopPropagation();
+    }
+
+    switch (event.keyCode) {
+      case event.DOM_VK_TAB:
+        if (event.ctrlKey && !event.altKey && !event.metaKey) {
+          if (isOpen) {
+            this.advanceFocus(!event.shiftKey);
+          } else if (!event.shiftKey) {
+            event.preventDefault();
+            event.stopPropagation();
+            let tabs = gBrowser.visibleTabs;
+            if (tabs.length > 2) {
+              this.open();
+            } else if (tabs.length == 2) {
+              let index = tabs[0].selected ? 1 : 0;
+              gBrowser.selectedTab = tabs[index];
+            }
+          }
+        }
+        break;
+      default:
+        if (isOpen && event.ctrlKey) {
+          if (event.keyCode == event.DOM_VK_DELETE) {
+            this.remove(this.selected);
+            break;
+          }
+          switch (event.charCode) {
+            case this.keys.close:
+              this.remove(this.selected);
+              break;
+            case this.keys.find:
+            case this.keys.selectAll:
+              this.showAllTabs();
+              break;
+          }
+        }
+    }
+  },
+
+  removeClosingTabFromUI: function ctrlTab_removeClosingTabFromUI(aTab) {
+    if (this.tabCount == 2) {
+      this.close();
+      return;
+    }
+
+    this._tabList = null;
+    this.updatePreviews();
+
+    if (this.selected.hidden)
+      this.advanceFocus(false);
+    if (this.selected == this.showAllButton)
+      this.advanceFocus(false);
+
+    // If the current tab is removed, another tab can steal our focus.
+    if (aTab.selected && this.panel.state == "open") {
+      setTimeout(function (selected) {
+        selected.focus();
+      }, 0, this.selected);
+    }
+  },
+
+  handleEvent: function ctrlTab_handleEvent(event) {
+    switch (event.type) {
+      case "TabAttrModified":
+        // tab attribute modified (e.g. label, crop, busy, image, selected)
+        for (let i = this.previews.length - 1; i >= 0; i--) {
+          if (this.previews[i]._tab && this.previews[i]._tab == event.target) {
+            this.updatePreview(this.previews[i], event.target);
+            break;
+          }
+        }
+        break;
+      case "TabSelect":
+        this.detachTab(event.target);
+        this.attachTab(event.target, 0);
+        break;
+      case "TabOpen":
+        this.attachTab(event.target, 1);
+        break;
+      case "TabClose":
+        this.detachTab(event.target);
+        if (this.isOpen)
+          this.removeClosingTabFromUI(event.target);
+        break;
+      case "keypress":
+        this.onKeyPress(event);
+        break;
+      case "keyup":
+        if (event.keyCode == event.DOM_VK_CONTROL)
+          this.pick();
+        break;
+    }
+  },
+
+  _init: function ctrlTab__init(enable) {
+    var toggleEventListener = enable ? "addEventListener" : "removeEventListener";
+
+    var tabContainer = gBrowser.tabContainer;
+    tabContainer[toggleEventListener]("TabOpen", this, false);
+    tabContainer[toggleEventListener]("TabAttrModified", this, false);
+    tabContainer[toggleEventListener]("TabSelect", this, false);
+    tabContainer[toggleEventListener]("TabClose", this, false);
+
+    document[toggleEventListener]("keypress", this, false);
+    gBrowser.mTabBox.handleCtrlTab = !enable;
+
+    // If we're not running, hide the "Show All Tabs" menu item,
+    // as Shift+Ctrl+Tab will be handled by the tab bar.
+    document.getElementById("menu_showAllTabs").hidden = !enable;
+
+    // Also disable the <key> to ensure Shift+Ctrl+Tab never triggers
+    // Show All Tabs.
+    var key_showAllTabs = document.getElementById("key_showAllTabs");
+    if (enable)
+      key_showAllTabs.removeAttribute("disabled");
+    else
+      key_showAllTabs.setAttribute("disabled", "true");
+  }
+};
+
+
+/**
+ * All Tabs panel
+ */
+var allTabs = {
+  get panel () {
+    delete this.panel;
+    return this.panel = document.getElementById("allTabs-panel");
+  },
+  get filterField () {
+    delete this.filterField;
+    return this.filterField = document.getElementById("allTabs-filter");
+  },
+  get container () {
+    delete this.container;
+    return this.container = document.getElementById("allTabs-container");
+  },
+  get tabCloseButton () {
+    delete this.tabCloseButton;
+    return this.tabCloseButton = document.getElementById("allTabs-tab-close-button");
+  },
+  get toolbarButton() document.getElementById("alltabs-button"),
+  get previews () this.container.getElementsByClassName("allTabs-preview"),
+  get isOpen () this.panel.state == "open" || this.panel.state == "showing",
+
+  init: function allTabs_init() {
+    if (this._initiated)
+      return;
+    this._initiated = true;
+
+    tabPreviews.init();
+
+    Array.forEach(gBrowser.tabs, function (tab) {
+      this._addPreview(tab);
+    }, this);
+
+    gBrowser.tabContainer.addEventListener("TabOpen", this, false);
+    gBrowser.tabContainer.addEventListener("TabAttrModified", this, false);
+    gBrowser.tabContainer.addEventListener("TabMove", this, false);
+    gBrowser.tabContainer.addEventListener("TabClose", this, false);
+  },
+
+  uninit: function allTabs_uninit() {
+    if (!this._initiated)
+      return;
+
+    gBrowser.tabContainer.removeEventListener("TabOpen", this, false);
+    gBrowser.tabContainer.removeEventListener("TabAttrModified", this, false);
+    gBrowser.tabContainer.removeEventListener("TabMove", this, false);
+    gBrowser.tabContainer.removeEventListener("TabClose", this, false);
+
+    while (this.container.hasChildNodes())
+      this.container.removeChild(this.container.firstChild);
+
+    this._initiated = false;
+  },
+
+  prefName: "browser.allTabs.previews",
+  readPref: function allTabs_readPref() {
+    var allTabsButton = this.toolbarButton;
+    if (!allTabsButton)
+      return;
+
+    if (gPrefService.getBoolPref(this.prefName)) {
+      allTabsButton.removeAttribute("type");
+      allTabsButton.setAttribute("command", "Browser:ShowAllTabs");
+    } else {
+      allTabsButton.setAttribute("type", "menu");
+      allTabsButton.removeAttribute("command");
+      allTabsButton.removeAttribute("oncommand");
+    }
+  },
+  observe: function (aSubject, aTopic, aPrefName) {
+    this.readPref();
+  },
+
+  pick: function allTabs_pick(aPreview) {
+    if (!aPreview)
+      aPreview = this._firstVisiblePreview;
+    if (aPreview)
+      this.tabToSelect = aPreview._tab;
+
+    this.close();
+  },
+
+  closeTab: function allTabs_closeTab(event) {
+    this.filterField.focus();
+    gBrowser.removeTab(event.currentTarget._targetPreview._tab);
+  },
+
+  filter: function allTabs_filter() {
+    if (this._currentFilter == this.filterField.value)
+      return;
+
+    this._currentFilter = this.filterField.value;
+
+    var filter = this._currentFilter.split(/\s+/g);
+    this._visible = 0;
+    Array.forEach(this.previews, function (preview) {
+      var tab = preview._tab;
+      var matches = 0;
+      if (filter.length && !tab.hidden) {
+        let tabstring = tab.linkedBrowser.currentURI.spec;
+        try {
+          tabstring = decodeURI(tabstring);
+        } catch (e) {}
+        tabstring = tab.label + " " + tab.label.toLocaleLowerCase() + " " + tabstring;
+        for (let i = 0; i < filter.length; i++)
+          matches += tabstring.includes(filter[i]);
+      }
+      if (matches < filter.length || tab.hidden) {
+        preview.hidden = true;
+      }
+      else {
+        this._visible++;
+        this._updatePreview(preview);
+        preview.hidden = false;
+      }
+    }, this);
+
+    this._reflow();
+  },
+
+  open: function allTabs_open() {
+    var allTabsButton = this.toolbarButton;
+    if (allTabsButton &&
+        allTabsButton.getAttribute("type") == "menu") {
+      // Without setTimeout, the menupopup won't stay open when invoking
+      // "View > Show All Tabs" and the menu bar auto-hides.
+      setTimeout(function () {
+        allTabsButton.open = true;
+      }, 0);
+      return;
+    }
+
+    this.init();
+
+    if (this.isOpen)
+      return;
+
+    this._maxPanelHeight = Math.max(gBrowser.clientHeight, screen.availHeight / 2);
+    this._maxPanelWidth = Math.max(gBrowser.clientWidth, screen.availWidth / 2);
+
+    this.filter();
+
+    tabPreviewPanelHelper.opening(this);
+
+    this.panel.popupBoxObject.setConsumeRollupEvent(PopupBoxObject.ROLLUP_NO_CONSUME);
+    this.panel.openPopup(gBrowser, "overlap", 0, 0, false, true);
+  },
+
+  close: function allTabs_close() {
+    this.panel.hidePopup();
+  },
+
+  setupGUI: function allTabs_setupGUI() {
+    this.filterField.focus();
+    this.filterField.placeholder = this.filterField.tooltipText;
+
+    this.panel.addEventListener("keypress", this, false);
+    this.panel.addEventListener("keypress", this, true);
+    this._browserCommandSet.addEventListener("command", this, false);
+
+    // When the panel is open, a second click on the all tabs button should
+    // close the panel but not re-open it.
+    document.getElementById("Browser:ShowAllTabs").setAttribute("disabled", "true");
+  },
+
+  suspendGUI: function allTabs_suspendGUI() {
+    this.filterField.placeholder = "";
+    this.filterField.value = "";
+    this._currentFilter = null;
+
+    this._updateTabCloseButton();
+
+    this.panel.removeEventListener("keypress", this, false);
+    this.panel.removeEventListener("keypress", this, true);
+    this._browserCommandSet.removeEventListener("command", this, false);
+
+    setTimeout(function () {
+      document.getElementById("Browser:ShowAllTabs").removeAttribute("disabled");
+    }, 300);
+  },
+
+  handleEvent: function allTabs_handleEvent(event) {
+    if (event.type.startsWith("Tab")) {
+      var tab = event.target;
+      if (event.type != "TabOpen")
+        var preview = this._getPreview(tab);
+    }
+    switch (event.type) {
+      case "TabAttrModified":
+        // tab attribute modified (e.g. label, crop, busy, image)
+        if (!preview.hidden)
+          this._updatePreview(preview);
+        break;
+      case "TabOpen":
+        if (this.isOpen)
+          this.close();
+        this._addPreview(tab);
+        break;
+      case "TabMove":
+        let siblingPreview = tab.nextSibling &&
+                             this._getPreview(tab.nextSibling);
+        if (siblingPreview)
+          siblingPreview.parentNode.insertBefore(preview, siblingPreview);
+        else
+          this.container.lastChild.appendChild(preview);
+        if (this.isOpen && !preview.hidden) {
+          this._reflow();
+          preview.focus();
+        }
+        break;
+      case "TabClose":
+        this._removePreview(preview);
+        break;
+      case "keypress":
+        this._onKeyPress(event);
+        break;
+      case "command":
+        if (event.target.id != "Browser:ShowAllTabs") {
+          // Close the panel when there's a browser command executing in the background.
+          this.close();
+        }
+        break;
+    }
+  },
+
+  _visible: 0,
+  _currentFilter: null,
+  get _stack () {
+    delete this._stack;
+    return this._stack = document.getElementById("allTabs-stack");
+  },
+  get _browserCommandSet () {
+    delete this._browserCommandSet;
+    return this._browserCommandSet = document.getElementById("mainCommandSet");
+  },
+  get _previewLabelHeight () {
+    delete this._previewLabelHeight;
+    return this._previewLabelHeight = parseInt(getComputedStyle(this.previews[0], "").lineHeight);
+  },
+
+  get _visiblePreviews ()
+    Array.filter(this.previews, function (preview) !preview.hidden),
+
+  get _firstVisiblePreview () {
+    if (this._visible == 0)
+      return null;
+    var previews = this.previews;
+    for (let i = 0; i < previews.length; i++) {
+      if (!previews[i].hidden)
+        return previews[i];
+    }
+    return null;
+  },
+
+  _reflow: function allTabs_reflow() {
+    this._updateTabCloseButton();
+
+    const CONTAINER_MAX_WIDTH = this._maxPanelWidth * .95;
+    const CONTAINER_MAX_HEIGHT = this._maxPanelHeight - 35;
+    // the size of the whole preview relative to the thumbnail
+    const REL_PREVIEW_THUMBNAIL = 1.2;
+    const REL_PREVIEW_HEIGHT_WIDTH = tabPreviews.height / tabPreviews.width;
+    const PREVIEW_MAX_WIDTH = tabPreviews.width * REL_PREVIEW_THUMBNAIL;
+
+    var rows, previewHeight, previewWidth, outerHeight;
+    this._columns = Math.floor(CONTAINER_MAX_WIDTH / PREVIEW_MAX_WIDTH);
+    do {
+      rows = Math.ceil(this._visible / this._columns);
+      previewWidth = Math.min(PREVIEW_MAX_WIDTH,
+                              Math.round(CONTAINER_MAX_WIDTH / this._columns));
+      previewHeight = Math.round(previewWidth * REL_PREVIEW_HEIGHT_WIDTH);
+      outerHeight = previewHeight + this._previewLabelHeight;
+    } while (rows * outerHeight > CONTAINER_MAX_HEIGHT && ++this._columns);
+
+    var outerWidth = previewWidth;
+    {
+      let innerWidth = Math.ceil(previewWidth / REL_PREVIEW_THUMBNAIL);
+      let innerHeight = Math.ceil(previewHeight / REL_PREVIEW_THUMBNAIL);
+      var canvasStyle = "max-width:" + innerWidth + "px;" +
+                        "min-width:" + innerWidth + "px;" +
+                        "max-height:" + innerHeight + "px;" +
+                        "min-height:" + innerHeight + "px;";
+    }
+
+    var previews = Array.slice(this.previews);
+
+    while (this.container.hasChildNodes())
+      this.container.removeChild(this.container.firstChild);
+    for (let i = rows || 1; i > 0; i--)
+      this.container.appendChild(document.createElement("hbox"));
+
+    var row = this.container.firstChild;
+    var colCount = 0;
+    previews.forEach(function (preview) {
+      if (!preview.hidden &&
+          ++colCount > this._columns) {
+        row = row.nextSibling;
+        colCount = 1;
+      }
+      preview.setAttribute("minwidth", outerWidth);
+      preview.setAttribute("height", outerHeight);
+      preview.setAttribute("canvasstyle", canvasStyle);
+      preview.removeAttribute("closebuttonhover");
+      row.appendChild(preview);
+    }, this);
+
+    this._stack.width = this._maxPanelWidth;
+    this.container.width = Math.ceil(outerWidth * Math.min(this._columns, this._visible));
+    this.container.left = Math.round((this._maxPanelWidth - this.container.width) / 2);
+    this.container.maxWidth = this._maxPanelWidth - this.container.left;
+    this.container.maxHeight = rows * outerHeight;
+  },
+
+  _addPreview: function allTabs_addPreview(aTab) {
+    var preview = document.createElement("button");
+    preview.className = "allTabs-preview";
+    preview._tab = aTab;
+    this.container.lastChild.appendChild(preview);
+  },
+
+  _removePreview: function allTabs_removePreview(aPreview) {
+    var updateUI = (this.isOpen && !aPreview.hidden);
+    aPreview._tab = null;
+    aPreview.parentNode.removeChild(aPreview);
+    if (updateUI) {
+      this._visible--;
+      this._reflow();
+      this.filterField.focus();
+    }
+  },
+
+  _getPreview: function allTabs_getPreview(aTab) {
+    var previews = this.previews;
+    for (let i = 0; i < previews.length; i++)
+      if (previews[i]._tab == aTab)
+        return previews[i];
+    return null;
+  },
+
+  _updateTabCloseButton: function allTabs_updateTabCloseButton(event) {
+    if (event && event.target == this.tabCloseButton)
+      return;
+
+    if (this.tabCloseButton._targetPreview) {
+      if (event && event.target == this.tabCloseButton._targetPreview)
+        return;
+
+      this.tabCloseButton._targetPreview.removeAttribute("closebuttonhover");
+    }
+
+    if (event &&
+        event.target.parentNode.parentNode == this.container &&
+        (event.target._tab.previousSibling || event.target._tab.nextSibling)) {
+      let canvas = event.target.firstChild.getBoundingClientRect();
+      let container = this.container.getBoundingClientRect();
+      let tabCloseButton = this.tabCloseButton.getBoundingClientRect();
+      let alignLeft = getComputedStyle(this.panel, "").direction == "rtl";
+#ifdef XP_MACOSX
+      alignLeft = !alignLeft;
+#endif
+      this.tabCloseButton.left = canvas.left -
+                                 container.left +
+                                 parseInt(this.container.left) +
+                                 (alignLeft ? 0 :
+                                  canvas.width - tabCloseButton.width);
+      this.tabCloseButton.top = canvas.top - container.top;
+      this.tabCloseButton._targetPreview = event.target;
+      this.tabCloseButton.style.visibility = "visible";
+      event.target.setAttribute("closebuttonhover", "true");
+    } else {
+      this.tabCloseButton.style.visibility = "hidden";
+      this.tabCloseButton.left = this.tabCloseButton.top = 0;
+      this.tabCloseButton._targetPreview = null;
+    }
+  },
+
+  _updatePreview: function allTabs_updatePreview(aPreview) {
+    aPreview.setAttribute("label", aPreview._tab.label);
+    aPreview.setAttribute("tooltiptext", aPreview._tab.label);
+    aPreview.setAttribute("crop", aPreview._tab.crop);
+    if (aPreview._tab.image)
+      aPreview.setAttribute("image", aPreview._tab.image);
+    else
+      aPreview.removeAttribute("image");
+  
+    aPreview.removeAttribute("soundplaying");
+    aPreview.removeAttribute("muted");
+    if (aPreview._tab.hasAttribute("muted"))
+      aPreview.setAttribute("muted", "true");
+    else if (aPreview._tab.hasAttribute("soundplaying"))
+      aPreview.setAttribute("soundplaying", "true");
+
+    var thumbnail = tabPreviews.get(aPreview._tab);
+    if (aPreview.firstChild) {
+      if (aPreview.firstChild == thumbnail)
+        return;
+      aPreview.removeChild(aPreview.firstChild);
+    }
+    aPreview.appendChild(thumbnail);
+  },
+
+  _onKeyPress: function allTabs_onKeyPress(event) {
+    if (event.eventPhase == event.CAPTURING_PHASE) {
+      this._onCapturingKeyPress(event);
+      return;
+    }
+
+    if (event.keyCode == event.DOM_VK_ESCAPE) {
+      this.close();
+      event.preventDefault();
+      event.stopPropagation();
+      return;
+    }
+
+    if (event.target == this.filterField) {
+      switch (event.keyCode) {
+        case event.DOM_VK_UP:
+          if (this._visible) {
+            let previews = this._visiblePreviews;
+            let columns = Math.min(previews.length, this._columns);
+            previews[Math.floor(previews.length / columns) * columns - 1].focus();
+            event.preventDefault();
+            event.stopPropagation();
+          }
+          break;
+        case event.DOM_VK_DOWN:
+          if (this._visible) {
+            this._firstVisiblePreview.focus();
+            event.preventDefault();
+            event.stopPropagation();
+          }
+          break;
+      }
+    }
+  },
+
+  _onCapturingKeyPress: function allTabs_onCapturingKeyPress(event) {
+    switch (event.keyCode) {
+      case event.DOM_VK_UP:
+      case event.DOM_VK_DOWN:
+        if (event.target != this.filterField)
+          this._advanceFocusVertically(event);
+        break;
+      case event.DOM_VK_RETURN:
+        if (event.target == this.filterField) {
+          this.filter();
+          this.pick();
+          event.preventDefault();
+          event.stopPropagation();
+        }
+        break;
+    }
+  },
+
+  _advanceFocusVertically: function allTabs_advanceFocusVertically(event) {
+    var preview = document.activeElement;
+    if (!preview || preview.parentNode.parentNode != this.container)
+      return;
+
+    event.stopPropagation();
+
+    var up = (event.keyCode == event.DOM_VK_UP);
+    var previews = this._visiblePreviews;
+
+    if (up && preview == previews[0]) {
+      this.filterField.focus();
+      return;
+    }
+
+    var i       = previews.indexOf(preview);
+    var columns = Math.min(previews.length, this._columns);
+    var column  = i % columns;
+    var row     = Math.floor(i / columns);
+
+    function newIndex()    row * columns + column;
+    function outOfBounds() newIndex() >= previews.length;
+
+    if (up) {
+      row--;
+      if (row < 0) {
+        let rows = Math.ceil(previews.length / columns);
+        row = rows - 1;
+        column--;
+        if (outOfBounds())
+          row--;
+      }
+    } else {
+      row++;
+      if (outOfBounds()) {
+        if (column == columns - 1) {
+          this.filterField.focus();
+          return;
+        }
+        row = 0;
+        column++;
+      }
+    }
+    previews[newIndex()].focus();
+  }
+};