treestyletab/modules/utils.js

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Tree Style Tab.
 *
 * The Initial Developer of the Original Code is SHIMODA Hiroshi.
 * Portions created by the Initial Developer are Copyright (C) 2010-2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s): SHIMODA Hiroshi <piro@p.club.ne.jp>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ******/
 
const EXPORTED_SYMBOLS = ['TreeStyleTabUtils']; 

const Cc = Components.classes;
const Ci = Components.interfaces;
 
Components.utils.import('resource://treestyletab-modules/lib/prefs.js'); 
Components.utils.import('resource://treestyletab-modules/lib/boxObject.js');
Components.utils.import('resource://treestyletab-modules/lib/stringBundle.js');
Components.utils.import('resource://treestyletab-modules/lib/extensions.js');
Components.utils.import('resource://treestyletab-modules/lib/animationManager.js');
Components.utils.import('resource://treestyletab-modules/lib/autoScroll.js');
Components.utils.import('resource://treestyletab-modules/lib/confirmWithTab.js');

Components.utils.import('resource://treestyletab-modules/lib/namespace.jsm');
var window = getNamespaceFor('piro.sakura.ne.jp');
 
var TreeStyleTabUtils = { 
	tabsHash : null,
	inWindowDestoructionProcess : false,
	
/* attributes */ 
	kID                 : 'treestyletab-id',
	kCHILDREN           : 'treestyletab-children',
	kPARENT             : 'treestyletab-parent',
	kANCESTOR           : 'treestyletab-ancestors',
	kNEST               : 'treestyletab-nest',
	kINSERT_BEFORE      : 'treestyletab-insert-before',
	kINSERT_AFTER       : 'treestyletab-insert-after',
	kCLOSED_SET_ID      : 'treestyletab-closed-set-id',

	kID_RESTORING       : 'treestyletab-id-restoring',
	kCHILDREN_RESTORING : 'treestyletab-children-restoring',

	kSUBTREE_COLLAPSED  : 'treestyletab-subtree-collapsed',
	kCOLLAPSED          : 'treestyletab-collapsed',
	kCOLLAPSED_DONE     : 'treestyletab-collapsed-done',
	kCOLLAPSING_PHASE   : 'treestyletab-collapsing-phase',
	kCOLLAPSING_PHASE_TO_BE_COLLAPSED : 'collapse',
	kCOLLAPSING_PHASE_TO_BE_EXPANDED : 'expand',
	kALLOW_COLLAPSE     : 'treestyletab-allow-subtree-collapse',
	kALLOW_STACK        : 'treestyletab-stack-collapsed-tabs',
	kREMOVED            : 'treestyletab-removed',

	kX_OFFSET           : 'treestyletab-x-offset',
	kY_OFFSET           : 'treestyletab-y-offset',

	kTABBAR_POSITION    : 'treestyletab-tabbar-position',
	kMODE               : 'treestyletab-mode',

	kHIDE_NEWTAB        : 'treestyletab-hide-newtab-button',
	kHIDE_ALLTABS       : 'treestyletab-hide-alltabs-button',
	kSTYLE              : 'treestyletab-style',
	kFIRSTTAB_BORDER    : 'treestyletab-firsttab-border',
	kFIXED              : 'treestyletab-tabbar-fixed',
	kRESIZING           : 'treestyletab-tabbar-resizing',
	kINDENTED           : 'treestyletab-tabs-indented',
	kMAX_LEVEL          : 'treestyletab-max-tree-level',
	kPRINT_PREVIEW      : 'treestyletab-print-preview',
	kANIMATION_ENABLED  : 'treestyletab-animation-enabled',

	kTAB_INVERTED          : 'treestyletab-tab-inverted',
	kTAB_CONTENTS_INVERTED : 'treestyletab-tab-contents-inverted',
	kCLOSEBOX_INVERTED     : 'treestyletab-closebox-inverted',

	kTWISTY_HOVER       : 'treestyletab-twisty-hover',
	kTWISTY_STYLE       : 'treestyletab-twisty-style',

	kDROP_POSITION      : 'treestyletab-drop-position',
	kDRAG_TYPE_TABBAR   : 'application/x-moz-treestyletab-tabbrowser-tabbar',
	kDROP_POSITION_UNKNOWN : 'unknown',
	kTABBAR_MOVE_FORCE  : 'force',
	kTABBAR_MOVE_NORMAL : 'normal',
 
/* classes */ 
	kTWISTY                : 'treestyletab-twisty',
	kTWISTY_CONTAINER      : 'treestyletab-twisty-container',
	kDROP_MARKER           : 'treestyletab-drop-marker',
	kDROP_MARKER_CONTAINER : 'treestyletab-drop-marker-container',
	kCOUNTER               : 'treestyletab-counter',
	kCOUNTER_CONTAINER     : 'treestyletab-counter-container',
	kCOUNTER_PAREN         : 'treestyletab-counter-paren',
	kSPLITTER              : 'treestyletab-splitter',
	kTABBAR_TOGGLER        : 'treestyletab-tabbar-toggler',
	kTABBAR_PLACEHOLDER    : 'treestyletab-tabbar-placeholder',
 
/* event types, topics */ 
	kEVENT_TYPE_TAB_FOCUS_SWITCHING_KEY_DOWN : 'nsDOMTreeStyleTabFocusSwitchingKeyDown',
	kEVENT_TYPE_TAB_FOCUS_SWITCHING_START    : 'nsDOMTreeStyleTabFocusSwitchingStart',
	kEVENT_TYPE_TAB_FOCUS_SWITCHING_END      : 'nsDOMTreeStyleTabFocusSwitchingEnd',
	kTAB_FOCUS_SWITCHING_SCROLL_DOWN    : (1 << 0),
	kTAB_FOCUS_SWITCHING_SCROLL_UP      : (1 << 1),
	kTAB_FOCUS_SWITCHING_STAND_BY       : (1 << 2),
	kTAB_FOCUS_SWITCHING_ONLY_SHIFT_KEY : (1 << 3),
	kEVENT_TYPE_SUBTREE_CLOSING              : 'nsDOMTreeStyleTabSubtreeClosing',
	kEVENT_TYPE_SUBTREE_CLOSED               : 'nsDOMTreeStyleTabSubtreeClosed',
	kEVENT_TYPE_TAB_COLLAPSED_STATE_CHANGED  : 'nsDOMTreeStyleTabCollapsedStateChange',
	kEVENT_TYPE_TABBAR_POSITION_CHANGING     : 'nsDOMTreeStyleTabTabbarPositionChanging',
	kEVENT_TYPE_TABBAR_POSITION_CHANGED      : 'nsDOMTreeStyleTabTabbarPositionChanged',
	kEVENT_TYPE_TABBAR_STATE_CHANGING        : 'nsDOMTreeStyleTabTabbarStateChanging',
	kEVENT_TYPE_TABBAR_STATE_CHANGED         : 'nsDOMTreeStyleTabTabbarStateChanged',
	kEVENT_TYPE_FOCUS_NEXT_TAB               : 'nsDOMTreeStyleTabFocusNextTab',
	kEVENT_TYPE_ATTACHED                     : 'nsDOMTreeStyleTabAttached',
	kEVENT_TYPE_DETACHED                     : 'nsDOMTreeStyleTabParted',

	kEVENT_TYPE_PRINT_PREVIEW_ENTERED        : 'nsDOMTreeStyleTabPrintPreviewEntered',
	kEVENT_TYPE_PRINT_PREVIEW_EXITED         : 'nsDOMTreeStyleTabPrintPreviewExited',
	kEVENT_TYPE_AUTO_HIDE_STATE_CHANGING     : 'nsDOMTreeStyleTabAutoHideStateChanging',
	kEVENT_TYPE_AUTO_HIDE_STATE_CHANGE       : 'nsDOMTreeStyleTabAutoHideStateChange',

	kTOPIC_INDENT_MODIFIED              : 'TreeStyleTab:indentModified',
	kTOPIC_COLLAPSE_EXPAND_ALL          : 'TreeStyleTab:collapseExpandAllSubtree',
	kTOPIC_CHANGE_TREEVIEW_AVAILABILITY : 'TreeStyleTab:changeTreeViewAvailability',
 
/* other constant values */ 
	kFOCUS_ALL     : 0,
	kFOCUS_VISIBLE : 1,

	kDROP_BEFORE : -1,
	kDROP_ON     : 0,
	kDROP_AFTER  : 1,

	kACTION_MOVE      : 1 << 0,
	kACTION_STAY      : 1 << 1,
	kACTION_DUPLICATE : 1 << 2,
	kACTION_IMPORT    : 1 << 3,
	kACTION_NEWTAB    : 1 << 4,
	kACTION_ATTACH    : 1 << 10,
	kACTION_PART      : 1 << 11,
	kACTIONS_FOR_SOURCE      : (1 << 0) | (1 << 1),
	kACTIONS_FOR_DESTINATION : (1 << 2) | (1 << 3),

	kTABBAR_TOP    : 1 << 0,
	kTABBAR_BOTTOM : 1 << 1,
	kTABBAR_LEFT   : 1 << 2,
	kTABBAR_RIGHT  : 1 << 3,

	kTABBAR_HORIZONTAL : (1 << 0) | (1 << 1),
	kTABBAR_VERTICAL   : (1 << 2) | (1 << 3),
	kTABBAR_REGULAR    : (1 << 0) | (1 << 2),
	kTABBAR_INVERTED   : (1 << 3) | (1 << 4),

	kINSERT_FISRT : 0,
	kINSERT_LAST  : 1,

	kTABBAR_UPDATE_BY_UNKNOWN_REASON    : (1 << 0),
	kTABBAR_UPDATE_BY_RESET             : (1 << 1),
	kTABBAR_UPDATE_BY_PREF_CHANGE       : (1 << 2),
	kTABBAR_UPDATE_BY_APPEARANCE_CHANGE : (1 << 3),
	kTABBAR_UPDATE_BY_SHOWHIDE_TABBAR   : (1 << 4),
	kTABBAR_UPDATE_BY_TABBAR_RESIZE     : (1 << 5),
	kTABBAR_UPDATE_BY_WINDOW_RESIZE     : (1 << 6),
	kTABBAR_UPDATE_BY_FULLSCREEN        : (1 << 7),
	kTABBAR_UPDATE_BY_PRIVATE_BROWSING  : (1 << 8),
	kTABBAR_UPDATE_BY_AUTOHIDE          : (1 << 9),
	kTABBAR_UPDATE_BY_INITIALIZE        : (1 << 10),
	kTABBAR_UPDATE_NOW                 : (1 << 5) | (1 << 6) | (1 << 9) | (1 << 10),
	kTABBAR_UPDATE_SYNC_TO_TABBAR      : (1 << 0) | (1 << 1) | (1 << 2) | (1 << 5) | (1 << 8) | (1 << 9),
	kTABBAR_UPDATE_SYNC_TO_PLACEHOLDER : (1 << 3) | (1 << 4) | (1 << 6) | (1 << 7) | (1 << 10),

	MAX_TABBAR_SIZE_RATIO        : 0.8,
	DEFAULT_SHRUNKEN_WIDTH_RATIO : 0.67,
 
/* base variables */ 
	baseIndent : 12,
	shouldDetectClickOnIndentSpaces : true,

	smoothScrollEnabled  : true,
	smoothScrollDuration : 150,

	animationEnabled : true,
	indentDuration   : 200,
	collapseDuration : 150,

	shouldExpandTwistyArea : true,

	scrollToNewTabMode : false,
 
	get SessionStore() { 
		if (!this._SessionStore) {
			this._SessionStore = Cc['@mozilla.org/browser/sessionstore;1'].getService(Ci.nsISessionStore);
		}
		return this._SessionStore;
	},
	_SessionStore : null,

	get ObserverService() {
		if (!this._ObserverService) {
			this._ObserverService = Cc['@mozilla.org/observer-service;1'].getService(Ci.nsIObserverService);
		}
		return this._ObserverService;
	},
	_ObserverService : null,

	get IOService() {
		if (!this._IOService) {
			this._IOService = Cc['@mozilla.org/network/io-service;1'].getService(Ci.nsIIOService);
		}
		return this._IOService;
	},
	_IOService : null,

	get WindowMediator() {
		if (!this._WindowMediator) {
			this._WindowMediator = Cc['@mozilla.org/appshell/window-mediator;1'].getService(Ci.nsIWindowMediator);
		}
		return this._WindowMediator;
	},
	_WindowMediator : null,

	get PromptService()
	{
		if (!this._PromptService) {
			this._PromptService = Cc['@mozilla.org/embedcomp/prompt-service;1'].getService(Ci.nsIPromptService);
		}
		return this._PromptService;
	},
	_PromptService : null,

	get XULAppInfo() {
		if (!this._XULAppInfo) {
			this._XULAppInfo = Cc['@mozilla.org/xre/app-info;1'].getService(Ci.nsIXULAppInfo).QueryInterface(Ci.nsIXULRuntime);
		}
		return this._XULAppInfo;
	},
	_XULAppInfo : null,
	get Comparator() {
		if (!this._Comparator) {
			this._Comparator = Cc['@mozilla.org/xpcom/version-comparator;1'].getService(Ci.nsIVersionComparator);
		}
		return this._Comparator;
	},
	_Comparator : null,
 
	get treeBundle() { 
		return window['piro.sakura.ne.jp'].stringBundle
				.get('chrome://treestyletab/locale/treestyletab.properties');
	},
	get tabbrowserBundle() {
		return window['piro.sakura.ne.jp'].stringBundle
				.get('chrome://browser/locale/tabbrowser.properties');
	},
 
	get extensions() { return window['piro.sakura.ne.jp'].extensions; }, 
	get animationManager() { return window['piro.sakura.ne.jp'].animationManager; },
	get autoScroll() { return window['piro.sakura.ne.jp'].autoScroll; },
 
	init : function TSTUtils_init() 
	{
		if (this._initialized) return;

		this.isMac = this.XULAppInfo.OS == 'Darwin';

		this.applyPlatformDefaultPrefs();

		this.addPrefListener(this);

		this.onPrefChange('extensions.treestyletab.indent');
		this.onPrefChange('extensions.treestyletab.clickOnIndentSpaces.enabled');
		this.onPrefChange('browser.tabs.loadFolderAndReplace.override');
		this.onPrefChange('browser.tabs.insertRelatedAfterCurrent.override');
		this.onPrefChange('extensions.stm.tabBarMultiRows.override'); // Super Tab Mode
		this.onPrefChange('extensions.treestyletab.tabbar.scroll.smooth');
		this.onPrefChange('extensions.treestyletab.tabbar.scroll.duration');
		this.onPrefChange('extensions.treestyletab.tabbar.scrollToNewTab.mode');
		this.onPrefChange('extensions.treestyletab.animation.enabled');
		this.onPrefChange('extensions.treestyletab.animation.indent.duration');
		this.onPrefChange('extensions.treestyletab.animation.collapse.duration');
		this.onPrefChange('extensions.treestyletab.twisty.expandSensitiveArea');

		try {
			if (this.XULAppInfo.OS == 'WINNT')
				this.updateAeroPeek();
		}
		catch(e) {
			dump(e+'\n');
		}
	},
	_initialized : false,
	applyPlatformDefaultPrefs : function TSTUtils_applyPlatformDefaultPrefs()
	{
		var OS = this.XULAppInfo.OS;
		var processed = {};
		this.getDescendant('extensions.treestyletab.platform.'+OS).forEach(function(aKey) {
			var key = aKey.replace('platform.'+OS+'.', '');
			this.setDefaultPref(key, this.getPref(aKey));
			processed[key] = true;
		}, this);
		this.getDescendant('extensions.treestyletab.platform.default').forEach(function(aKey) {
			var key = aKey.replace('platform.default.', '');
			if (!(key in processed))
				this.setDefaultPref(key, this.getPref(aKey));
		}, this);
	},
	
	updateAeroPeek : function TSTUtils_updateAeroPeek() 
	{
		var ns = {};
		Components.utils.import('resource://gre/modules/WindowsPreviewPerTab.jsm', ns);
		this.AeroPeek = ns.AeroPeek;
	},
  
	observe : function TSTUtils_observe(aSubject, aTopic, aData) 
	{
		switch (aTopic)
		{
			case 'nsPref:changed':
				this.onPrefChange(aData);
				return;
		}
	},
 
/* utilities */ 
	
	getBoxObjectFor : function TSTUtils_getBoxObjectFor(aNode) 
	{
		return window['piro.sakura.ne.jp'].boxObject.getBoxObjectFor(aNode);
	},
 
	evalInSandbox : function TSTUtils_evalInSandbox(aCode, aOwner) 
	{
		try {
			var sandbox = new Components.utils.Sandbox(aOwner || 'about:blank');
			return Components.utils.evalInSandbox(aCode, sandbox);
		}
		catch(e) {
		}
		return void(0);
	},
 
	get browserWindow() 
	{
		return this.topBrowserWindow;
	},
	get topBrowserWindow()
	{
		return this.WindowMediator.getMostRecentWindow('navigator:browser');
	},
 
	get browserWindows() 
	{
		var windows = [];

		var targets = this.WindowMediator.getZOrderDOMWindowEnumerator('navigator:browser', true);
		// By the bug 156333, we cannot find windows by their Z order on Linux.
		// https://bugzilla.mozilla.org/show_bug.cgi?id=156333
		if (!targets.hasMoreElements())
			targets = this.WindowMediator.getEnumerator('navigator:browser');

		while (targets.hasMoreElements())
		{
			let target = targets.getNext()
							.QueryInterface(Ci.nsIDOMWindowInternal);
			windows.push(target);
		}

		return windows;
	},
 
	get browser() 
	{
		var w = this.browserWindow;
		return !w ? null :
			'SplitBrowser' in w ? w.SplitBrowser.activeBrowser :
			w.gBrowser ;
	},
 
	get currentDragSession() 
	{
		return Cc['@mozilla.org/widget/dragservice;1']
				.getService(Ci.nsIDragService)
				.getCurrentSession();
	},
 
	dropLinksOnTabBehavior : function TSTUtils_dropLinksOnTabBehavior() 
	{
		var behavior = this.getTreePref('dropLinksOnTab.behavior');
		if (behavior & this.kDROPLINK_FIXED) return behavior;

		var checked = { value : false };
		var newChildTab = this.PromptService.confirmEx(this.browserWindow,
				this.treeBundle.getString('dropLinkOnTab.title'),
				this.treeBundle.getString('dropLinkOnTab.text'),
				(this.PromptService.BUTTON_TITLE_IS_STRING * this.PromptService.BUTTON_POS_0) +
				(this.PromptService.BUTTON_TITLE_IS_STRING * this.PromptService.BUTTON_POS_1),
				this.treeBundle.getString('dropLinkOnTab.openNewChildTab'),
				this.treeBundle.getString('dropLinkOnTab.loadInTheTab'),
				null,
				this.treeBundle.getString('dropLinkOnTab.never'),
				checked
			) == 0;

		behavior = newChildTab ? this.kDROPLINK_NEWTAB : this.kDROPLINK_LOAD ;
		if (checked.value)
			this.setTreePref('dropLinksOnTab.behavior', behavior);

		return behavior
	},
	kDROPLINK_ASK    : 0,
	kDROPLINK_FIXED  : 1 + 2,
	kDROPLINK_LOAD   : 1,
	kDROPLINK_NEWTAB : 2,
 
	openGroupBookmarkBehavior : function TSTUtils_openGroupBookmarkBehavior() 
	{
		var behavior = this.getTreePref('openGroupBookmark.behavior');
		if (behavior & this.kGROUP_BOOKMARK_FIXED) return behavior;

		var dummyTabFlag = behavior & this.kGROUP_BOOKMARK_USE_DUMMY;

		var checked = { value : false };
		var button = this.PromptService.confirmEx(this.browserWindow,
				this.treeBundle.getString('openGroupBookmarkBehavior.title'),
				this.treeBundle.getString('openGroupBookmarkBehavior.text'),
				(this.PromptService.BUTTON_TITLE_IS_STRING * this.PromptService.BUTTON_POS_0) +
				(this.PromptService.BUTTON_TITLE_IS_STRING * this.PromptService.BUTTON_POS_1) +
				(this.PromptService.BUTTON_TITLE_IS_STRING * this.PromptService.BUTTON_POS_2),
				this.treeBundle.getString('openGroupBookmarkBehavior.subTree'),
				this.treeBundle.getString('openGroupBookmarkBehavior.separate'),
				this.treeBundle.getString('openGroupBookmarkBehavior.replace'),
				this.treeBundle.getString('openGroupBookmarkBehavior.never'),
				checked
			);

		if (button < 0) button = 1;
		var behaviors = [
				this.kGROUP_BOOKMARK_SUBTREE | dummyTabFlag,
				this.kGROUP_BOOKMARK_SEPARATE,
				this.kGROUP_BOOKMARK_REPLACE
			];
		behavior = behaviors[button];

		if (checked.value) {
			this.setTreePref('openGroupBookmark.behavior', behavior);
			this.setPref('browser.tabs.loadFolderAndReplace', behavior & this.kGROUP_BOOKMARK_REPLACE ? true : false );
		}
		return behavior;
	},
	kGROUP_BOOKMARK_ASK       : 0,
	kGROUP_BOOKMARK_FIXED     : 1 + 2 + 4,
	kGROUP_BOOKMARK_SUBTREE   : 1,
	kGROUP_BOOKMARK_SEPARATE  : 2,
	kGROUP_BOOKMARK_REPLACE   : 4,
	kGROUP_BOOKMARK_USE_DUMMY                   : 256,
	kGROUP_BOOKMARK_USE_DUMMY_FORCE             : 1024,
	kGROUP_BOOKMARK_DONT_RESTORE_TREE_STRUCTURE : 512,
	kGROUP_BOOKMARK_EXPAND_ALL_TREE             : 2048,
 
	bookmarkDroppedTabsBehavior : function TSTUtils_bookmarkDroppedTabsBehavior() 
	{
		var behavior = this.getTreePref('bookmarkDroppedTabs.behavior');
		if (behavior & this.kBOOKMARK_DROPPED_TABS_FIXED) return behavior;

		var checked = { value : false };
		var button = this.PromptService.confirmEx(this.browserWindow,
				this.treeBundle.getString('bookmarkDroppedTabs.title'),
				this.treeBundle.getString('bookmarkDroppedTabs.text'),
				(this.PromptService.BUTTON_TITLE_IS_STRING * this.PromptService.BUTTON_POS_0) +
				(this.PromptService.BUTTON_TITLE_IS_STRING * this.PromptService.BUTTON_POS_1),
				this.treeBundle.getString('bookmarkDroppedTabs.bookmarkAll'),
				this.treeBundle.getString('bookmarkDroppedTabs.bookmarkOnlyParent'),
				null,
				this.treeBundle.getString('bookmarkDroppedTabs.never'),
				checked
			);

		if (button < 0) button = 1;
		var behaviors = [
				this.kBOOKMARK_DROPPED_TABS_ALL,
				this.kBOOKMARK_DROPPED_TABS_ONLY_PARENT
			];
		behavior = behaviors[button];

		if (checked.value)
			this.setTreePref('bookmarkDroppedTabs.behavior', behavior);

		return behavior;
	},
	kBOOKMARK_DROPPED_TABS_ASK         : 0,
	kBOOKMARK_DROPPED_TABS_FIXED       : 1 + 2,
	kBOOKMARK_DROPPED_TABS_ALL         : 1,
	kBOOKMARK_DROPPED_TABS_ONLY_PARENT : 2,
 
	askUndoCloseTabSetBehavior : function TSTUtils_askUndoCloseTabSetBehavior(aRestoredTab, aCount) 
	{
		var behavior = this.undoCloseTabSetBehavior;
		if (behavior & this.kUNDO_CLOSE_SET) behavior ^= this.kUNDO_CLOSE_SET;

		var self = this;
		var neverAskState = (behavior & this.kUNDO_ASK) ? false : true ;
		var checkbox = {
				label : this.treeBundle.getString('undoCloseTabSetBehavior.never'),
				checked : neverAskState
			};
		return confirmWithTab({
				tab      : aRestoredTab,
				label    : this.treeBundle.getFormattedString('undoCloseTabSetBehavior.label', [aCount]),
				value    : 'treestyletab-undo-close-tree',
				buttons  : [
					this.treeBundle.getString('undoCloseTabSetBehavior.set'),
					this.treeBundle.getString('undoCloseTabSetBehavior.separate')
				],
				checkbox : checkbox,
				cancelEvents : ['TabClose', 'SSTabRestoring']
			})
			.next(function(aButtonIndex) {
				if (aButtonIndex == 0) {
					behavior |= self.kUNDO_CLOSE_SET;
				}
				if (checkbox.checked != neverAskState) {
					behavior ^= self.kUNDO_ASK;
					self.setTreePref('undoCloseTabSet.behavior', behavior);
				}
				return behavior;
			});
	},
	get undoCloseTabSetBehavior()
	{
		return this.getTreePref('undoCloseTabSet.behavior');
	},
	kUNDO_ASK            : 1,
	kUNDO_CLOSE_SET      : 2,
	kUNDO_CLOSE_FULL_SET : 256,
 
// event 
	
	isNewTabAction : function TSTUtils_isNewTabAction(aEvent) 
	{
		return aEvent.button == 1 || (aEvent.button == 0 && this.isAccelKeyPressed(aEvent));
	},
 
	isAccelKeyPressed : function TSTUtils_isAccelKeyPressed(aEvent) 
	{
		if ( // this is releasing of the accel key!
			(aEvent.type == 'keyup') &&
			(aEvent.keyCode == (this.isMac ? Ci.nsIDOMKeyEvent.DOM_VK_META : Ci.nsIDOMKeyEvent.DOM_VK_CONTROL ))
			) {
			return false;
		}
		return this.isMac ?
			(aEvent.metaKey || (aEvent.keyCode == Ci.nsIDOMKeyEvent.DOM_VK_META)) :
			(aEvent.ctrlKey || (aEvent.keyCode == Ci.nsIDOMKeyEvent.DOM_VK_CONTROL)) ;
	},
 
	isCopyAction : function TSTUtils_isCopyAction(aEvent) 
	{
		return this.isAccelKeyPressed(aEvent) ||
				(aEvent.dataTransfer && aEvent.dataTransfer.dropEffect == 'copy');
	},
 
	isEventFiredOnClosebox : function TSTUtils_isEventFiredOnClosebox(aEvent) 
	{
		return this.evaluateXPath(
				'ancestor-or-self::*[contains(concat(" ", normalize-space(@class), " "), " tab-close-button ")]',
				aEvent.originalTarget || aEvent.target,
				Ci.nsIDOMXPathResult.BOOLEAN_TYPE
			).booleanValue;
	},
 
	isEventFiredOnClickable : function TSTUtils_isEventFiredOnClickable(aEvent) 
	{
		return this.evaluateXPath(
				'ancestor-or-self::*[contains(" button toolbarbutton scrollbar popup menupopup panel tooltip splitter ", concat(" ", local-name(), " "))]',
				aEvent.originalTarget,
				Ci.nsIDOMXPathResult.BOOLEAN_TYPE
			).booleanValue;
	},
 
	isEventFiredOnTwisty : function TSTUtils_isEventFiredOnTwisty(aEvent) 
	{
		var tab = this.getTabFromEvent(aEvent);
		if (!tab ||
			!this.hasChildTabs(tab) ||
			!this.canCollapseSubtree(tab))
			return false;

		var twisty = tab.ownerDocument.getAnonymousElementByAttribute(tab, 'class', this.kTWISTY);
		if (!twisty)
			return false;

		var box = twisty.boxObject;
		var minX = box.screenX;
		var minY = box.screenY;
		var maxX = minX + box.width;
		var maxY = minY + box.height;
		if (!box.width || !box.height) {
			minX = maxX = tab.boxObject.screenX + tab.boxObject.width;
			minY = maxY = tab.boxObject.screenY + tab.boxObject.height;
		}
		if (
			(this.shouldExpandTwistyArea || !box.width || !box.height) &&
			!this._expandTwistyAreaBlockers.length
			) {
			let icon  = tab.ownerDocument.getAnonymousElementByAttribute(tab, 'class', 'tab-icon');
			let box = icon.boxObject;
			minX = Math.min(minX, box.screenX);
			minY = Math.min(minY, box.screenY);
			maxX = Math.max(maxX, box.screenX + box.width);
			maxY = Math.max(maxY, box.screenY + box.height);
		}

		var x = aEvent.screenX;
		var y = aEvent.screenY;
		return (x >= minX && x <= maxX && y >= minY && y <= maxY);
	},
	
	// called with target(nsIDOMEventTarget), document(nsIDOMDocument), type(string) and data(object)
	fireDataContainerEvent : function()
	{
		var target, document, type, data, canBubble, cancellable;
		Array.slice(arguments).forEach(function(aArg) {
			if (typeof aArg == 'boolean') {
				if (canBubble === void(0))
					canBubble = aArg;
				else
					cancellable = aArg;
			}
			else if (typeof aArg == 'string')
				type = aArg;
			else if (aArg instanceof Ci.nsIDOMDocument)
				document = aArg;
			else if (aArg instanceof Ci.nsIDOMEventTarget)
				target = aArg;
			else
				data = aArg;
		});
		if (!target)
			target = document;
		if (!document)
			document = target.ownerDocument || target;

		var event = document.createEvent('DataContainerEvent');
		event.initEvent(type, canBubble, cancellable);
		for (var i in data)
		{
			if (!data.hasOwnProperty(i))
				continue;
			event.setData(i, data[i]);
			event[i] = data[i]; // for backward compatibility
		}

		return target.dispatchEvent(event);
	},
 
	registerExpandTwistyAreaBlocker : function TSTUtils_registerExpandTwistyAreaBlocker(aBlocker) /* PUBLIC API */ 
	{
		if (this._expandTwistyAreaBlockers.indexOf(aBlocker) < 0)
			this._expandTwistyAreaBlockers.push(aBlocker);
	},
	_expandTwistyAreaBlockers : [],
 
	registerExpandTwistyAreaAllowance : function TSTUtils_registerExpandTwistyAreaAllowance(aAllowance) /* PUBLIC API, obsolete, for backward compatibility */ 
	{
		this.registerExpandTwistyAreaBlocker(aAllowance.toSource());
	},
   
// string 
	
	makeNewId : function TSTUtils_makeNewId() 
	{
		return 'tab-<'+Date.now()+'-'+parseInt(Math.random() * 65000)+'>';
	},
 
	makeNewClosedSetId : function TSTUtils_makeNewId() 
	{
		return 'tabs-closed-set-<'+Date.now()+'-'+parseInt(Math.random() * 65000)+'>';
	},
 
	makeURIFromSpec : function TSTUtils_makeURIFromSpec(aURI) 
	{
		var newURI;
		aURI = aURI || '';
		if (aURI && String(aURI).indexOf('file:') == 0) {
			var fileHandler = this.IOService.getProtocolHandler('file').QueryInterface(Ci.nsIFileProtocolHandler);
			var tempLocalFile = fileHandler.getFileFromURLSpec(aURI);
			newURI = this.IOService.newFileURI(tempLocalFile);
		}
		else {
			if (!/^\w+\:/.test(aURI)) aURI = 'http://'+aURI;
			newURI = this.IOService.newURI(aURI, null, null);
		}
		return newURI;
	},
 
	getGroupTabURI : function TSTUtils_getGroupTabURI(aTitle) 
	{
		return 'about:treestyletab-group'+(aTitle === void(0) ? '' : '?'+encodeURIComponent(aTitle) );
	},
  
// xpath 
	
	NSResolver : { 
		lookupNamespaceURI : function(aPrefix)
		{
			switch (aPrefix)
			{
				case 'xul':
					return 'http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul';
				case 'html':
				case 'xhtml':
					return 'http://www.w3.org/1999/xhtml';
				case 'xlink':
					return 'http://www.w3.org/1999/xlink';
				default:
					return '';
			}
		}
	},
 
	evaluateXPath : function TSTUtils_evaluateXPath(aExpression, aContext, aType) 
	{
		if (!aType) aType = Ci.nsIDOMXPathResult.ORDERED_NODE_SNAPSHOT_TYPE;
		try {
			var XPathResult = (aContext.ownerDocument || aContext).evaluate(
					aExpression,
					(aContext || document),
					this.NSResolver,
					aType,
					null
				);
		}
		catch(e) {
			return {
				singleNodeValue : null,
				snapshotLength  : 0,
				snapshotItem    : function() {
					return null
				}
			};
		}
		return XPathResult;
	},
 
	getArrayFromXPathResult : function TSTUtils_getArrayFromXPathResult(aXPathResult) 
	{
		var max = aXPathResult.snapshotLength;
		var array = new Array(max);
		if (!max) return array;

		for (var i = 0; i < max; i++)
		{
			array[i] = aXPathResult.snapshotItem(i);
		}

		return array;
	},
  
/* Session Store API */ 
	
	getTabValue : function TSTUtils_getTabValue(aTab, aKey) 
	{
		var value = '';
		try {
			value = this.SessionStore.getTabValue(aTab, aKey);
		}
		catch(e) {
		}

		if (this.useTMPSessionAPI) {
			let TMPValue = aTab.getAttribute(this.kTMP_SESSION_DATA_PREFIX+aKey);
			if (TMPValue) value = TMPValue;
		}

		return value;
	},
 
	setTabValue : function TSTUtils_setTabValue(aTab, aKey, aValue) 
	{
		if (!aValue) return this.deleteTabValue(aTab, aKey);

		aTab.setAttribute(aKey, aValue);
		try {
			this.checkCachedSessionDataExpiration(aTab);
			this.SessionStore.setTabValue(aTab, aKey, aValue);
		}
		catch(e) {
		}

		if (this.useTMPSessionAPI)
			aTab.setAttribute(this.kTMP_SESSION_DATA_PREFIX+aKey, aValue);

		return aValue;
	},
 
	deleteTabValue : function TSTUtils_deleteTabValue(aTab, aKey) 
	{
		aTab.removeAttribute(aKey);
		try {
			this.checkCachedSessionDataExpiration(aTab);
			this.SessionStore.setTabValue(aTab, aKey, '');
			this.SessionStore.deleteTabValue(aTab, aKey);
		}
		catch(e) {
		}

		if (this.useTMPSessionAPI)
			aTab.removeAttribute(this.kTMP_SESSION_DATA_PREFIX+aKey);
	},
 
	// workaround for http://piro.sakura.ne.jp/latest/blosxom/mozilla/extension/treestyletab/2009-09-29_debug.htm
	checkCachedSessionDataExpiration : function TSTUtils_checkCachedSessionDataExpiration(aTab) 
	{
		var data = aTab.linkedBrowser.__SS_data || // Firefox 3.6-
					aTab.linkedBrowser.parentNode.__SS_data; // -Frefox 3.5
		if (data &&
			data._tabStillLoading &&
			aTab.getAttribute('busy') != 'true' &&
			aTab.linkedBrowser.__SS_restoreState != 1)
			data._tabStillLoading = false;
	},
 
	markAsClosedSet : function TSTUtils_markAsClosedSet(aTabs) /* PUBLIC API */ 
	{
		if (!aTabs || aTabs.length <= 1) return;
		var id = this.makeNewClosedSetId() + '::' + aTabs.length;
		aTabs.forEach(function(aTab) {
			this.setTabValue(aTab, this.kCLOSED_SET_ID, id);
		}, this);
	},
 
	unmarkAsClosedSet : function TSTUtils_unmarkAsClosedSet(aTabs) /* PUBLIC API */ 
	{
		if (!aTabs || !aTabs.length) return;
		aTabs.forEach(function(aTab) {
			this.deleteTabValue(aTab, this.kCLOSED_SET_ID);
		}, this);
	},
 
	useTMPSessionAPI : false, 
 
	kTMP_SESSION_DATA_PREFIX : 'tmp-session-data-', 
  
// tab 
	
	getTabStrip : function TSTUtils_getTabStrip(aTabBrowser) 
	{
		if (!(aTabBrowser instanceof Ci.nsIDOMElement))
			return null;

		var strip = aTabBrowser.mStrip;
		return (strip && strip instanceof Ci.nsIDOMElement) ?
				strip :
				aTabBrowser.tabContainer.parentNode;
	},
	get tabStrip()
	{
		return this.getTabStrip(this.browser);
	},
 
	getTabContainerBox : function TSTUtils_getTabContainerBox(aTabBrowser) 
	{
		if (!(aTabBrowser instanceof Ci.nsIDOMElement))
			return null;

		var strip = this.getTabStrip(aTabBrowser);
		return strip.tabsToolbarInnerBox || aTabBrowser.tabContainer;
	},
	get tabContainerBox()
	{
		return this.getTabContainerBox(this.browser);
	},
 
	setTabbrowserAttribute : function TSTUtils_setTabbrowserAttribute(aName, aValue, aTabBrowser) 
	{
		aTabBrowser = aTabBrowser || this.mTabBrowser || this.browser;
		if (aValue) {
			aTabBrowser.setAttribute(aName, aValue);
			aTabBrowser.mTabContainer.setAttribute(aName, aValue);
			aTabBrowser.treeStyleTab.setTabStripAttribute(aName, aValue);
		}
		else {
			aTabBrowser.removeAttribute(aName);
			aTabBrowser.mTabContainer.removeAttribute(aName);
			aTabBrowser.treeStyleTab.removeTabStripAttribute(aName);
		}
	},
 
	removeTabbrowserAttribute : function TSTUtils_removeTabbrowserAttribute(aName, aTabBrowser) 
	{
		this.setTabbrowserAttribute(aName, null, aTabBrowser);
	},
 
	setTabStripAttribute : function TSTUtils_setTabStripAttribute(aAttr, aValue) 
	{
		var strip = this.tabStrip;
		if (!strip) return;
		var isFeatureAttribute = aAttr.indexOf('treestyletab-') == 0;
		if (aValue) {
			strip.setAttribute(aAttr, aValue);
			if (isFeatureAttribute) {
				// Only attributes for TST's feature are applied to the root element.
				// (width, height, and other general attributes have to be ignored!)
				strip.ownerDocument.defaultView.setTimeout(function(aSelf) {
					strip.ownerDocument.documentElement.setAttribute(aAttr, aValue);
				}, 10, this);
			}
			if (this._tabStripPlaceHolder)
				this._tabStripPlaceHolder.setAttribute(aAttr, aValue);
			if (strip.tabsToolbarInnerBox)
				strip.tabsToolbarInnerBox.setAttribute(aAttr, aValue);
		}
		else {
			strip.removeAttribute(aAttr);
			if (isFeatureAttribute) {
				strip.ownerDocument.defaultView.setTimeout(function(aSelf) {
					strip.ownerDocument.documentElement.removeAttribute(aAttr);
				}, 10, this);
			}
			if (this._tabStripPlaceHolder)
				this._tabStripPlaceHolder.removeAttribute(aAttr);
			if (strip.tabsToolbarInnerBox)
				strip.tabsToolbarInnerBox.removeAttribute(aAttr);
		}
	},
 
	removeTabStripAttribute : function TSTUtils_removeTabStripAttribute(aAttr) 
	{
		this.setTabStripAttribute(aAttr, null);
	},
 
	getTabFromChild : function TSTUtils_getTabFromChild(aTab) 
	{
		return this.evaluateXPath(
				'ancestor-or-self::xul:tab',
				aTab,
				Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
			).singleNodeValue;
	},
 
	getTabFromEvent : function TSTUtils_getTabFromEvent(aEvent) 
	{
		return this.getTabFromChild(aEvent.originalTarget || aEvent.target);
	},
 
	getSplitterFromEvent : function TSTUtils_getSplitterFromEvent(aEvent) 
	{
		return this.evaluateXPath(
				'ancestor-or-self::xul:splitter[contains(concat(" ", normalize-space(@class), " "), " '+this.kSPLITTER+' ")]',
				aEvent.originalTarget,
				Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
			).singleNodeValue;
	},
 
	isEventFiredOnGrippy : function TSTUtils_isEventFiredOnGrippy(aEvent) 
	{
		return this.evaluateXPath(
				'ancestor-or-self::xul:grippy',
				aEvent.originalTarget,
				Ci.nsIDOMXPathResult.BOOLEAN_TYPE
			).booleanValue;
	},
 
	getTabFromFrame : function TSTUtils_getTabFromFrame(aFrame, aTabBrowser) 
	{
		var b = aTabBrowser || this.browser;
		var top = aFrame.top;
		var tabs = this.getAllTabsArray(b);
		for each (var tab in tabs)
		{
			if (tab.linkedBrowser.contentWindow == top)
				return tab;
		}
		return null;
	},
 
	getTabbarFromChild : function TSTUtils_getTabbarFromChild(aNode) 
	{
		return this.evaluateXPath(
				'ancestor-or-self::*[contains(concat(" ", normalize-space(@class), " "), " tabbrowser-strip ")] | '+
				'ancestor-or-self::xul:tabs[@tabbrowser] | ' +
				'ancestor-or-self::xul:toolbar[@id="TabsToolbar"]/child::xul:tabs[@tabbrowser]',
				aNode,
				Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
			).singleNodeValue;
	},
 
	getTabbarFromEvent : function TSTUtils_getTabbarFromEvent(aEvent) 
	{
		return this.getTabbarFromChild(aEvent.originalTarget || aEvent.target);
	},
 
	cleanUpTabsArray : function TSTUtils_cleanUpTabsArray(aTabs) 
	{
		var newTabs = [];
		aTabs.forEach(function(aTab) {
			if (!aTab.parentNode) return; // ignore removed tabs
			if (newTabs.indexOf(aTab) < 0) newTabs.push(aTab);
		});
		newTabs.sort(this.sortTabsByOrder);
		return newTabs;
	},
	
	sortTabsByOrder : function TSTUtils_sortTabsByOrder(aA, aB) 
	{
		return aA._tPos - aB._tPos;
	},
  
	gatherSubtreeMemberTabs : function TSTUtils_gatherSubtreeMemberTabs(aTabOrTabs, aOnlyChildren) 
	{
		var tabs = aTabOrTabs;
		if (!(tabs instanceof Array)) {
			tabs = [aTabOrTabs];
		}

		var b = this.getTabBrowserFromChild(tabs[0]);
		var descendant = [];
		for (var i = 0, maxi = tabs.length; i < maxi; i++)
		{
			descendant = descendant.concat(b.treeStyleTab.getDescendantTabs(tabs[i]));
		}

		return this.cleanUpTabsArray(aOnlyChildren ? descendant : tabs.concat(descendant));
	},
 
	splitTabsToSubtrees : function TSTUtils_splitTabsToSubtrees(aTabs) /* PUBLIC API */ 
	{
		var groups = [];
		var group = [];
		this.cleanUpTabsArray(aTabs)
			.forEach(function(aTab) {
				var parent = this.getParentTab(aTab);
				if (!parent || group.indexOf(parent) < 0) {
					if (group.length) groups.push(group);
					group = [aTab];
				}
				else {
					group.push(aTab);
				}
			}, this);
		if (group.length) groups.push(group);
		return groups;
	},
  
// tabbrowser 
	
	getTabBrowserFromChild : function TSTUtils_getTabBrowserFromChild(aTabBrowserChild) 
	{
		if (!aTabBrowserChild)
			return null;

		if (aTabBrowserChild.__treestyletab__linkedTabBrowser) // tab
			return aTabBrowserChild.__treestyletab__linkedTabBrowser;

		if (aTabBrowserChild.localName == 'tabbrowser') // itself
			return aTabBrowserChild;

		if (aTabBrowserChild.tabbrowser) // tabs, Firefox 4.0 or later
			return aTabBrowserChild.tabbrowser;

		if (aTabBrowserChild.id == 'TabsToolbar') // tabs toolbar, Firefox 4.0 or later
			return aTabBrowserChild.getElementsByTagName('tabs')[0].tabbrowser;

		// tab context menu on Firefox 4.0
		var popup = this.evaluateXPath(
				'ancestor-or-self::xul:menupopup[@id="tabContextMenu"]',
				aTabBrowserChild,
				Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
			).singleNodeValue;
		if (popup && 'TabContextMenu' in aTabBrowserChild.ownerDocument.defaultView)
			return this.getTabBrowserFromChild(aTabBrowserChild.ownerDocument.defaultView.TabContextMenu.contextTab);

		var b = this.evaluateXPath(
				'ancestor::xul:tabbrowser | '+
				'ancestor::xul:tabs[@tabbrowser] |'+
				'ancestor::xul:toolbar[@id="TabsToolbar"]/descendant::xul:tabs',
				aTabBrowserChild,
				Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
			).singleNodeValue;
		return (b && b.tabbrowser) || b;
	},
 
	getTabBrowserFromFrame : function TSTUtils_getTabBrowserFromFrame(aFrame) 
	{
		var w = this.browserWindow;
		return !w ? null :
			('SplitBrowser' in w) ? this.getTabBrowserFromChild(w.SplitBrowser.getSubBrowserAndBrowserFromFrame(aFrame.top).browser) :
			this.browser ;
	},
 
	getFrameFromTabBrowserElements : function TSTUtils_getFrameFromTabBrowserElements(aFrameOrTabBrowser) 
	{
		var frame = aFrameOrTabBrowser;
		if (frame == '[object XULElement]') {
			if (frame.localName == 'tab') {
				frame = frame.linkedBrowser.contentWindow;
			}
			else if (frame.localName == 'browser') {
				frame = frame.contentWindow;
			}
			else {
				frame = this.getTabBrowserFromChild(frame);
				if (!frame) return null;
				frame = frame.contentWindow;
			}
		}
		if (!frame)
			frame = this.browser.contentWindow;

		return frame;
	},
   
/* get tab(s) */ 
	
	getTabById : function TSTUtils_getTabById(aId, aTabBrowserChildren) 
	{
		if (!aId) return null;

		if (aTabBrowserChildren && !(aTabBrowserChildren instanceof Ci.nsIDOMNode))
			aTabBrowserChildren = null;

		var b = this.getTabBrowserFromChild(aTabBrowserChildren) || this.browser;

		if (this.tabsHash) // XPath-less implementation
			return this.tabsHash[aId] || null;

		return this.evaluateXPath(
			'descendant::xul:tab[@'+this.kID+' = "'+aId+'"]',
			b.mTabContainer,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	isTabDuplicated : function TSTUtils_isTabDuplicated(aTab) 
	{
		if (!aTab) return false;
		var id = this.getTabValue(aTab, this.kID);
		var b = this.getTabBrowserFromChild(aTab) || this.browser;
		return this.evaluateXPath(
			'count(descendant::xul:tab[@'+this.kID+' = "'+id+'" or @'+this.kID_RESTORING+' = "'+id+'"]) > 1',
			b.mTabContainer,
			Ci.nsIDOMXPathResult.BOOLEAN_TYPE
		).booleanValue;
	},
 
	/**
	 * Returns all tabs in the current group as a XPathResult.
	 * It includes tabs hidden by Tab Panorama.
	 */
	getAllTabs : function TSTUtils_getTabs(aTabBrowserChild) /* OBSOLETE */ 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		return this.evaluateXPath(
			'descendant::xul:tab',
			b.mTabContainer
		);
	},
 
	/**
	 * Returns all tabs in the current group as a XPathResult.
	 * It excludes tabs hidden by Tab Panorama.
	 */
	getTabs : function TSTUtils_getTabs(aTabBrowserChild) /* OBSOLETE */ 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		return this.evaluateXPath(
			'descendant::xul:tab[not(@hidden="true")]',
			b.mTabContainer
		);
	},
 
	/**
	 * Returns all tabs in the current group as an array.
	 * It includes tabs hidden by Tab Panorama.
	 */
	getAllTabsArray : function TSTUtils_getAllTabsArray(aTabBrowserChild) 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		return Array.slice(b.mTabContainer.childNodes) ;
	},
 
	/**
	 * Returns all tabs in the current group as an array.
	 * It excludes tabs hidden by Tab Panorama.
	 */
	getTabsArray : function TSTUtils_getTabsArray(aTabBrowserChild) 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		return b.visibleTabs || Array.slice(b.mTabContainer.childNodes) ;
	},
 
	/**
	 * Returns the first tab in the current group.
	 */
	getFirstTab : function TSTUtils_getFirstTab(aTabBrowserChild) 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		var tabs = b.visibleTabs;
		return tabs ? tabs[0] : b.mTabContainer.firstChild;
	},
 
	/**
	 * Returns the first visible, not collapsed, and not pinned tab.
	 */
	getFirstNormalTab : function TSTUtils_getFirstNormalTab(aTabBrowserChild) 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		return this.evaluateXPath(
			'descendant::xul:tab[not(@pinned="true") and not(@hidden="true")]',
			b.mTabContainer,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	/**
	 * Returns the last tab in the current group.
	 */
	getLastTab : function TSTUtils_getLastTab(aTabBrowserChild) 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		var tabs = b.visibleTabs;
		return tabs ? tabs[tabs.length-1] : b.mTabContainer.lastChild ;
	},
 
	/**
	 * Returns the next tab in the current group.
	 */
	getNextTab : function TSTUtils_getNextTab(aTab) 
	{
		if (!aTab) return null;
		var b = this.getTabBrowserFromChild(aTab);
		var tabs = b.visibleTabs;
		if (tabs) {
			let index = tabs.indexOf(aTab);
			if (index > -1)
				return tabs.length > index ? tabs[index+1] : null
		}
		var tab = aTab.nextSibling;
		return (tab && tab.localName == 'tab') ? tab : null ;
	},
 
	/**
	 * Returns the previous tab in the current group.
	 */
	getPreviousTab : function TSTUtils_getPreviousTab(aTab) 
	{
		if (!aTab) return null;
		var b = this.getTabBrowserFromChild(aTab);
		var tabs = b.visibleTabs;
		if (tabs) {
			let index = tabs.indexOf(aTab);
			if (index > -1)
				return 0 < index ? tabs[index-1] : null
		}
		var tab = aTab.previousSibling;
		return (tab && tab.localName == 'tab') ? tab : null ;
	},
 
	/**
	 * Returns the index of the specified tab, in the current group.
	 */
	getTabIndex : function TSTUtils_getTabIndex(aTab) 
	{
		if (!aTab) return -1;
		var b = this.getTabBrowserFromChild(aTab);
		return this.getTabsArray(b).indexOf(aTab);
	},
 
	/**
	 * Returns the next not collapsed tab in the current group.
	 */
	getNextVisibleTab : function TSTUtils_getNextVisibleTab(aTab) 
	{
		if (!aTab) return null;

		var b = this.getTabBrowserFromChild(aTab);
		if (!this.canCollapseSubtree(b))
			return this.getNextTab(aTab);

		var tabs = this.getVisibleTabsArray(b);
		if (tabs.indexOf(aTab) < 0) tabs.push(aTab);
		tabs.sort(this.sortTabsByOrder);

		var index = tabs.indexOf(aTab);
		return (index < tabs.length-1) ? tabs[index+1] : null ;
	},
 
	/**
	 * Returns the previous not collapsed tab in the current group.
	 */
	getPreviousVisibleTab : function TSTUtils_getPreviousVisibleTab(aTab) 
	{
		if (!aTab) return null;

		var b = this.getTabBrowserFromChild(aTab);
		if (!this.canCollapseSubtree(b))
			return this.getPreviousTab(aTab);

		var tabs = this.getVisibleTabsArray(b);
		if (tabs.indexOf(aTab) < 0) tabs.push(aTab);
		tabs.sort(this.sortTabsByOrder);

		var index = tabs.indexOf(aTab);
		return (index > 0) ? tabs[index-1] : null ;
	},
 
	/**
	 * Returns the last not collapsed tab in the current group.
	 */
	getLastVisibleTab : function TSTUtils_getLastVisibleTab(aTabBrowserChild) 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		if (!b) return null;
		var tabs = this.getVisibleTabsArray(b);
		return tabs.length ? tabs[tabs.length-1] : null ;
	},
 
	/**
	 * Returns a XPathResult of not collapsed tabs in the current group.
	 */
	getVisibleTabs : function TSTUtils_getVisibleTabs(aTabBrowserChild) /* OBSOLETE */ 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		if (!this.canCollapseSubtree(b))
			return this.getTabs(b);

		var XPathResult = this.evaluateXPath(
				'child::xul:tab[not(@'+this.kCOLLAPSED+'="true") and not(@hidden="true")]',
				b.mTabContainer
			);
		return XPathResult;
	},
 
	/**
	 * Returns an array of not collapsed tabs in the current group.
	 */
	getVisibleTabsArray : function TSTUtils_getVisibleTabsArray(aTabBrowserChild) 
	{
		var b = this.getTabBrowserFromChild(aTabBrowserChild);
		var tabs = this.getTabsArray(b);
		return this.canCollapseSubtree(b) ?
				tabs.filter(function(aTab) {
					return aTab.getAttribute(this.kCOLLAPSED) != 'true';
				}, this) :
				tabs ;
	},
 
	/**
	 * Returns the index of the specified tab, in the array of not collapsed
	 * tabs in the current group.
	 */
	getVisibleIndex : function TSTUtils_getVisibleIndex(aTab) 
	{
		if (!aTab) return -1;
		var b = this.getTabBrowserFromChild(aTab);
		return this.getVisibleTabsArray(b).indexOf(aTab);
	},
  
/* notify "ready to open child tab(s)" */ 
	
	readyToOpenChildTab : function TSTUtils_readyToOpenChildTab(aFrameOrTabBrowser, aMultiple, aInsertBefore) /* PUBLIC API */ 
	{
		if (!this.getTreePref('autoAttachNewTabsAsChildren')) return;

		var frame = this.getFrameFromTabBrowserElements(aFrameOrTabBrowser);
		if (!frame)
			return;

		var ownerBrowser = this.getTabBrowserFromFrame(frame);

		var parentTab = this.getTabFromFrame(frame, ownerBrowser);
		if (!parentTab || parentTab.getAttribute('pinned') == 'true')
			return;

		ownerBrowser.treeStyleTab.ensureTabInitialized(parentTab);
		var parentId = parentTab.getAttribute(this.kID);

		var refId = null;
		if (aInsertBefore) {
			ownerBrowser.treeStyleTab.ensureTabInitialized(parentTab);
			refId = aInsertBefore.getAttribute(this.kID);
		}

		ownerBrowser.treeStyleTab.readiedToAttachNewTab   = true;
		ownerBrowser.treeStyleTab.readiedToAttachMultiple = aMultiple || false ;
		ownerBrowser.treeStyleTab.multipleCount           = aMultiple ? 0 : -1 ;
		ownerBrowser.treeStyleTab.parentTab               = parentId;
		ownerBrowser.treeStyleTab.insertBefore            = refId;
	},
 
	readyToOpenNewTabGroup : function TSTUtils_readyToOpenNewTabGroup(aFrameOrTabBrowser, aTreeStructure, aExpandAllTree) /* PUBLIC API */ 
	{
		if (!this.getTreePref('autoAttachNewTabsAsChildren')) return;

		var frame = this.getFrameFromTabBrowserElements(aFrameOrTabBrowser);
		if (!frame) return;

		this.stopToOpenChildTab(frame);

		var ownerBrowser = this.getTabBrowserFromFrame(frame);
		ownerBrowser.treeStyleTab.readiedToAttachNewTabGroup = true;
		ownerBrowser.treeStyleTab.readiedToAttachMultiple    = true;
		ownerBrowser.treeStyleTab.multipleCount              = 0;
		ownerBrowser.treeStyleTab.treeStructure              = aTreeStructure;
		ownerBrowser.treeStyleTab.shouldExpandAllTree        = aExpandAllTree ? true : false ;
	},
 
	stopToOpenChildTab : function TSTUtils_stopToOpenChildTab(aFrameOrTabBrowser) /* PUBLIC API */ 
	{
		var frame = this.getFrameFromTabBrowserElements(aFrameOrTabBrowser);
		if (!frame) return;

		var ownerBrowser = this.getTabBrowserFromFrame(frame);
		ownerBrowser.treeStyleTab.readiedToAttachNewTab      = false;
		ownerBrowser.treeStyleTab.readiedToAttachNewTabGroup = false;
		ownerBrowser.treeStyleTab.readiedToAttachMultiple    = false;
		ownerBrowser.treeStyleTab.multipleCount              = -1;
		ownerBrowser.treeStyleTab.parentTab                  = null;
		ownerBrowser.treeStyleTab.insertBefore               = null;
		ownerBrowser.treeStyleTab.treeStructure              = null;
		ownerBrowser.treeStyleTab.shouldExpandAllTree        = false;
	},
 
	checkToOpenChildTab : function TSTUtils_checkToOpenChildTab(aFrameOrTabBrowser) /* PUBLIC API */ 
	{
		var frame = this.getFrameFromTabBrowserElements(aFrameOrTabBrowser);
		if (!frame) return false;

		var ownerBrowser = this.getTabBrowserFromFrame(frame);
		return ownerBrowser.treeStyleTab.readiedToAttachNewTab || ownerBrowser.treeStyleTab.readiedToAttachNewTabGroup ? true : false ;
	},
  
/* tree manipulations */ 
	
	get treeViewEnabled() /* PUBLIC API */ 
	{
		return this._treeViewEnabled;
	},
	set treeViewEnabled(aValue)
	{
		this._treeViewEnabled = aValue ? true : false ;
		this.ObserverService.notifyObservers(
			window,
			this.kTOPIC_CHANGE_TREEVIEW_AVAILABILITY,
			this._treeViewEnabled
		);
		return aValue;
	},
	_treeViewEnabled : true,
 
	get rootTabs() /* PUBLIC API */ 
	{
		return this.getArrayFromXPathResult(
				this.evaluateXPath(
					'child::xul:tab[not(@'+this.kNEST+') or @'+this.kNEST+'="0" or @'+this.kNEST+'=""]',
					this.browser.mTabContainer
				)
			);
	},
 
	get allRootTabs() /* PUBLIC API */ 
	{
		return this.rootTabs;
	},
 
	get visibleRootTabs() /* PUBLIC API */ 
	{
		return this.rootTabs.filter(function(aTab) {
				return !aTab.hidden;
			});
	},
 
	canCollapseSubtree : function TSTUtils_canCollapseSubtree(aTabOrTabBrowser) /* PUBLIC API */ 
	{
		if (aTabOrTabBrowser &&
			aTabOrTabBrowser.localName == 'tab' &&
			aTabOrTabBrowser.getAttribute(this.kALLOW_COLLAPSE) != 'true')
			return false;

		var b = this.getTabBrowserFromChild(aTabOrTabBrowser) || this.browser;
		return b.getAttribute(this.kALLOW_COLLAPSE) == 'true';
	},
 
	isCollapsed : function TSTUtils_isCollapsed(aTab) /* PUBLIC API */ 
	{
		if (!aTab || !this.canCollapseSubtree(aTab))
			return false;

		return aTab.getAttribute(this.kCOLLAPSED) == 'true';
	},
 
	isSubtreeCollapsed : function TSTUtils_isSubtreeCollapsed(aTab) /* PUBLIC API */ 
	{
		if (!aTab || !this.canCollapseSubtree(aTab) || !this.hasChildTabs(aTab))
			return false;

		return aTab.getAttribute(this.kSUBTREE_COLLAPSED) == 'true';
	},
 
	shouldCloseTabSubtreeOf : function TSTUtils_shouldCloseTabSubtreeOf(aTab) 
	{
		return (
			this.hasChildTabs(aTab) &&
			(
				this.getTreePref('closeParentBehavior') == this.CLOSE_PARENT_BEHAVIOR_CLOSE ||
				this.isSubtreeCollapsed(aTab)
			)
		);
	},
	shouldCloseTabSubTreeOf : function() { return this.shouldCloseTabSubtreeOf.apply(this, arguments); }, // obsolete, for backward compatibility
 
	shouldCloseLastTabSubtreeOf : function TSTUtils_shouldCloseLastTabSubtreeOf(aTab) 
	{
		var b = this.getTabBrowserFromChild(aTab);
		return (
			this.shouldCloseTabSubtreeOf(aTab) &&
			this.getDescendantTabs(aTab).length + 1 == this.getAllTabsArray(b).length
		);
	},
	shouldCloseLastTabSubTreeOf : function() { return this.shouldCloseLastTabSubtreeOf.apply(this, arguments); }, // obsolete, for backward compatibility
 
	getParentTab : function TSTUtils_getParentTab(aTab) /* PUBLIC API */ 
	{
		if (!aTab) return null;

		if (this.tabsHash) { // XPath-less implementation
			let parent = this.getTabById(aTab.getAttribute(this.kPARENT));
			return (parent && parent != aTab) ? parent : null ;
		}

		return this.evaluateXPath(
			'preceding-sibling::xul:tab[@'+this.kID+'="'+aTab.getAttribute(this.kPARENT)+'"][1]',
			aTab,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	getAncestorTabs : function TSTUtils_getAncestorTabs(aTab) /* PUBLIC API */ 
	{
		var tabs = [];
		var parentTab = aTab;
		while (parentTab = this.getParentTab(parentTab))
		{
			tabs.push(parentTab);
		}
		return tabs;
	},
 
	getRootTab : function TSTUtils_getRootTab(aTab) /* PUBLIC API */ 
	{
		if (!aTab) return null;

		if (this.tabsHash) { // XPath-less implementation
			let parent = aTab;
			let root   = aTab;
			while (parent = this.getParentTab(parent))
			{
				root = parent;
			}
			return root;
		}

		return this.evaluateXPath(
			'(self::*[not(@'+this.kPARENT+')] | preceding-sibling::xul:tab[not(@'+this.kPARENT+')])[last()]',
			aTab,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	getNextSiblingTab : function TSTUtils_getNextSiblingTab(aTab) /* PUBLIC API */ 
	{
		if (!aTab) return null;

		if (this.tabsHash) { // XPath-less implementation
			let parentTab = this.getParentTab(aTab);

			if (!parentTab) {
				let next = aTab;
				do {
					next = next.nextSibling;
				}
				while (next &&
						next.nodeType == Ci.nsIDOMNode.ELEMENT_NODE &&
						this.getParentTab(next));
				return next;
			}

			let children = parentTab.getAttribute(this.kCHILDREN);
			if (children) {
				let list = ('|'+children).split('|'+aTab.getAttribute(this.kID))[1].split('|');
				for (let i = 0, maxi = list.length; i < maxi; i++)
				{
					let firstChild = this.getTabById(list[i], aTab);
					if (firstChild) return firstChild;
				}
			}
			return null;
		}

		var parent = aTab.getAttribute(this.kPARENT);
		return this.evaluateXPath(
			'following-sibling::xul:tab['+
				(parent ? '@'+this.kPARENT+'="'+parent+'"' : 'not(@'+this.kPARENT+')' )+
			'][1]',
			aTab,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	getPreviousSiblingTab : function TSTUtils_getPreviousSiblingTab(aTab) /* PUBLIC API */ 
	{
		if (!aTab) return null;

		if (this.tabsHash) { // XPath-less implementation
			let parentTab = this.getParentTab(aTab);

			if (!parentTab) {
				let prev = aTab;
				do {
					prev = prev.previousSibling;
				}
				while (prev &&
						prev.nodeType == Ci.nsIDOMNode.ELEMENT_NODE &&
						this.getParentTab(prev));
				return prev;
			}

			let children = parentTab.getAttribute(this.kCHILDREN);
			if (children) {
				let list = ('|'+children).split('|'+aTab.getAttribute(this.kID))[0].split('|');
				for (let i = list.length-1; i > -1; i--)
				{
					let lastChild = this.getTabById(list[i], aTab);
					if (lastChild) return lastChild;
				}
			}
			return null;
		}

		var parent = aTab.getAttribute(this.kPARENT);
		return this.evaluateXPath(
			'preceding-sibling::xul:tab['+
				(parent ? '@'+this.kPARENT+'="'+parent+'"' : 'not(@'+this.kPARENT+')' )+
			'][1]',
			aTab,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	getChildTabs : function TSTUtils_getChildTabs(aTab, aAllTabsArray) /* PUBLIC API */ 
	{
		var tabs = [];
		if (!aTab) return tabs;

		var children = aTab.getAttribute(this.kCHILDREN);
		if (!children) return tabs;

		if (aAllTabsArray) tabs = aAllTabsArray;

		var list = children.split('|');
		for (let i = 0, maxi = list.length; i < maxi; i++)
		{
			let tab = this.getTabById(list[i], aTab);
			if (!tab || tab == aTab) continue;
			tabs.push(tab);
			if (aAllTabsArray)
				this.getChildTabs(tab, tabs);
		}

		return tabs;
	},
 
	hasChildTabs : function TSTUtils_hasChildTabs(aTab) /* PUBLIC API */ 
	{
		if (!aTab) return false;
		return aTab.hasAttribute(this.kCHILDREN);
	},
 
	getDescendantTabs : function TSTUtils_getDescendantTabs(aTab) /* PUBLIC API */ 
	{
		var tabs = [];
		this.getChildTabs(aTab, tabs);
		return tabs;
	},
 
	getFirstChildTab : function TSTUtils_getFirstChildTab(aTab) /* PUBLIC API */ 
	{
		if (!aTab) return null;

		if (this.tabsHash) { // XPath-less implementation
			let children   = aTab.getAttribute(this.kCHILDREN);
			let firstChild = null;
			if (children) {
				let list = children.split('|');
				for (let i = 0, maxi = list.length; i < maxi; i++)
				{
					firstChild = this.getTabById(list[i], aTab);
					if (firstChild && firstChild != aTab) break;
				}
			}
			return firstChild;
		}

		return this.evaluateXPath(
			'following-sibling::xul:tab[@'+this.kPARENT+'="'+aTab.getAttribute(this.kID)+'"][1]',
			aTab,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	getLastChildTab : function TSTUtils_getLastChildTab(aTab) /* PUBLIC API */ 
	{
		if (!aTab) return null;

		if (this.tabsHash) { // XPath-less implementation
			let children  = aTab.getAttribute(this.kCHILDREN);
			let lastChild = null;
			if (children) {
				let list = children.split('|');
				for (let i = list.length-1; i > -1; i--)
				{
					lastChild = this.getTabById(list[i], aTab);
					if (lastChild && lastChild != aTab) break;
				}
			}
			return lastChild;
		}

		return this.evaluateXPath(
			'following-sibling::xul:tab[@'+this.kPARENT+'="'+aTab.getAttribute(this.kID)+'"][last()]',
			aTab,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	getLastDescendantTab : function TSTUtils_getLastDescendantTab(aTab) /* PUBLIC API */ 
	{
		if (!aTab) return null;

		if (this.tabsHash) { // XPath-less implementation
			let tabs = this.getDescendantTabs(aTab);
			return tabs.length ? tabs[tabs.length-1] : null ;
		}

		var parent = aTab.getAttribute(this.kPARENT);
		return this.evaluateXPath(
			'following-sibling::xul:tab['+
				(parent ? '@'+this.kPARENT+'="'+parent+'"' : 'not(@'+this.kPARENT+')' )+
			'][1]/preceding-sibling::xul:tab[1][not(@'+this.kID+'="'+aTab.getAttribute(this.kID)+'")]',
			aTab,
			Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
	},
 
	getChildIndex : function TSTUtils_getChildIndex(aTab, aParent) /* PUBLIC API */ 
	{
		if (this.tabsHash) { // XPath-less implementation
			let parent = this.getParentTab(aTab);
			if (!aParent || !parent || aParent != parent) {
				parent = aTab;
				while (parent && parent != aParent)
				{
					aTab = parent;
					parent = this.getParentTab(parent);
				}
				if (parent != aParent)
					return -1;
				aParent = parent;
			}

			if (aParent) {
				let children = aParent.getAttribute(this.kCHILDREN);
				let list = children.split('|');
				let id = aTab.getAttribute(this.kID);
				for (let i = 0, maxi = list.length; i < maxi; i++)
				{
					if (list[i] == id) return i;
				}
				return -1;
			}
			else {
				let tabs = this.rootTabs;
				for (let i = 0, maxi = tabs.length; i < maxi; i++)
				{
					if (tabs[i] == aTab) return i;
				}
			}
			return -1;
		}

		var parent = aTab.getAttribute(this.kPARENT);
		if (!parent) return -1;
		return this.evaluateXPath(
			'count(preceding-sibling::xul:tab[@'+this.kPARENT+' and @'+this.kPARENT+'="'+parent+'"])',
			aTab,
			Ci.nsIDOMXPathResult.NUMBER_TYPE
		).numberValue;
	},
 
	getXOffsetOfTab : function TSTUtils_getXOffsetOfTab(aTab) 
	{
		var extraCondition = this.canCollapseSubtree(aTab) ?
								'[not(@'+this.kCOLLAPSED+'="true")]' :
								'' ;

		return this.evaluateXPath(
			'sum((self::* | preceding-sibling::xul:tab[not(@hidden="true")]'+extraCondition+')'+
				'/attribute::'+this.kX_OFFSET+')',
			aTab,
			Ci.nsIDOMXPathResult.NUMBER_TYPE
		).numberValue;
	},
	getYOffsetOfTab : function TSTUtils_getYOffsetOfTab(aTab)
	{
		var extraCondition = this.canCollapseSubtree(aTab) ?
								'[not(@'+this.kCOLLAPSED+'="true")]' :
								'';

		return this.evaluateXPath(
			'sum((self::* | preceding-sibling::xul:tab[not(@hidden="true")]'+extraCondition+')'+
				'/attribute::'+this.kY_OFFSET+')',
			aTab,
			Ci.nsIDOMXPathResult.NUMBER_TYPE
		).numberValue;
	},
 
	isGroupTab : function TSTUtils_isGroupTab(aTab, aLazyCheck) 
	{
		return (
			(aLazyCheck || aTab.linkedBrowser.sessionHistory.count == 1) &&
			aTab.linkedBrowser.currentURI.spec.indexOf('about:treestyletab-group') > -1
		);
	},
 
	get pinnedTabsCount() 
	{
		return this.evaluateXPath(
					'count(child::xul:tab[@pinned="true"])',
					this.browser.mTabContainer,
					Ci.nsIDOMXPathResult.NUMBER_TYPE
				).numberValue;
	},
  
/* tabbar position */ 
	
	get currentTabbarPosition() /* PUBLIC API */ 
	{
		return this.getTreePref('tabbar.position') || 'top';
	},
	set currentTabbarPosition(aValue)
	{
		var position = String(aValue).toLowerCase();
		if (!position || !/^(top|bottom|left|right)$/.test(position))
			position = 'top';

		if (position != this.getTreePref('tabbar.position'))
			this.setTreePref('tabbar.position', position);

		return aValue;
	},
 
	getPositionFlag : function TSTUtils_getPositionFlag(aPosition) 
	{
		aPosition = String(aPosition).toLowerCase();
		return (aPosition == 'left') ? this.kTABBAR_LEFT :
			(aPosition == 'right') ? this.kTABBAR_RIGHT :
			(aPosition == 'bottom') ? this.kTABBAR_BOTTOM :
			this.kTABBAR_TOP;
	},
  
/* Pref Listener */ 
	
	domains : [ 
		'extensions.treestyletab.',
		'browser.tabs.loadFolderAndReplace',
		'browser.tabs.insertRelatedAfterCurrent',
		'extensions.stm.tabBarMultiRows' // Super Tab Mode
	],
 
	onPrefChange : function TSTUtils_onPrefChange(aPrefName) 
	{
		var value = this.getPref(aPrefName);
		switch (aPrefName)
		{
			case 'extensions.treestyletab.indent':
				this.baseIndent = value;
				this.ObserverService.notifyObservers(null, this.kTOPIC_INDENT_MODIFIED, value);
				break;

			case 'extensions.treestyletab.tabbar.width':
			case 'extensions.treestyletab.tabbar.shrunkenWidth':
				this.updateTabWidthPrefs(aPrefName);
				break;

			case 'browser.tabs.insertRelatedAfterCurrent':
			case 'browser.tabs.loadFolderAndReplace':
			case 'extensions.stm.tabBarMultiRows': // Super Tab Mode
				if (this.prefOverriding) return;
				aPrefName += '.override';
				this.setPref(aPrefName, value);
			case 'browser.tabs.insertRelatedAfterCurrent.override':
			case 'browser.tabs.loadFolderAndReplace.override':
			case 'extensions.stm.tabBarMultiRows.override': // Super Tab Mode
				if (this.getPref(aPrefName+'.force')) {
					let defaultValue = this.getDefaultPref(aPrefName);
					if (value != defaultValue) {
						this.setPref(aPrefName, defaultValue);
						return;
					}
				}
				this.prefOverriding = true;
				let (target = aPrefName.replace('.override', '')) {
					let originalValue = this.getPref(target);
					if (originalValue !== null && originalValue != value)
						this.setPref(target+'.backup', originalValue);
					this.setPref(target, this.getPref(aPrefName));
				}
				this.prefOverriding = false;
				break;

			case 'extensions.treestyletab.clickOnIndentSpaces.enabled':
				this.shouldDetectClickOnIndentSpaces = this.getPref(aPrefName);
				break;

			case 'extensions.treestyletab.tabbar.scroll.smooth':
				this.smoothScrollEnabled = value;
				break;
			case 'extensions.treestyletab.tabbar.scroll.duration':
				this.smoothScrollDuration = value;
				break;

			case 'extensions.treestyletab.tabbar.scrollToNewTab.mode':
				this.scrollToNewTabMode = value;
				break;

			case 'extensions.treestyletab.animation.enabled':
				this.animationEnabled = value;
				break;
			case 'extensions.treestyletab.animation.indent.duration':
				this.indentDuration = value;
				break;
			case 'extensions.treestyletab.animation.collapse.duration':
				this.collapseDuration = value;
				break;

			case 'extensions.treestyletab.twisty.expandSensitiveArea':
				this.shouldExpandTwistyArea = value;
				break;

			default:
				break;
		}
	},
	
	updateTabWidthPrefs : function TSTUtils_updateTabWidthPrefs(aPrefName) 
	{
		var expanded = this.getTreePref('tabbar.width');
		var shrunken = this.getTreePref('tabbar.shrunkenWidth');
		var originalExpanded = expanded;
		var originalShrunken = shrunken;
		if (aPrefName == 'extensions.treestyletab.tabbar.shrunkenWidth') {
			if (expanded <= shrunken)
				expanded = parseInt(shrunken / this.DEFAULT_SHRUNKEN_WIDTH_RATIO)
			let w = this.browserWindow;
			if (w && expanded > w.gBrowser.boxObject.width) {
				expanded = w.gBrowser.boxObject.width * this.MAX_TABBAR_SIZE_RATIO;
				if (expanded <= shrunken)
					shrunken = parseInt(expanded * this.DEFAULT_SHRUNKEN_WIDTH_RATIO)
			}
		}
		else {
			if (expanded <= shrunken)
				shrunken = parseInt(expanded * this.DEFAULT_SHRUNKEN_WIDTH_RATIO);
		}
		if (expanded != originalExpanded ||
			shrunken != originalShrunken) {
			this.tabbarWidthResetting = true;
			this.setTreePref('tabbar.width', Math.max(0, expanded));
			this.setTreePref('tabbar.shrunkenWidth', Math.max(0, shrunken));
			this.tabbarWidthResetting = false;
		}
	},
   
/* Save/Load Prefs */ 
	
	getTreePref : function TSTUtils_getTreePref(aPrefstring) 
	{
		return this.getPref('extensions.treestyletab.'+aPrefstring);
	},
 
	setTreePref : function TSTUtils_setTreePref(aPrefstring, aNewValue) 
	{
		return this.setPref('extensions.treestyletab.'+aPrefstring, aNewValue);
	},
 
	clearTreePref : function TSTUtils_clearTreePref(aPrefstring) 
	{
		return this.clearPref('extensions.treestyletab.'+aPrefstring);
	}
  
}; 
 
TreeStyleTabUtils.__proto__ = window['piro.sakura.ne.jp'].prefs;