treestyletab/content/treestyletab/treestyletabbrowser.js

function TreeStyleTabBrowser(aTabBrowser) 
{
	this.mTabBrowser = aTabBrowser;
}
 
TreeStyleTabBrowser.prototype = { 

	kMENUITEM_RELOADSUBTREE            : 'context-item-reloadTabSubtree',
	kMENUITEM_RELOADCHILDREN           : 'context-item-reloadDescendantTabs',
	kMENUITEM_REMOVESUBTREE            : 'context-item-removeTabSubtree',
	kMENUITEM_REMOVECHILDREN           : 'context-item-removeDescendantTabs',
	kMENUITEM_COLLAPSEEXPAND_SEPARATOR : 'context-separator-collapseExpandAll',
	kMENUITEM_COLLAPSE                 : 'context-item-collapseAllSubtree',
	kMENUITEM_EXPAND                   : 'context-item-expandAllSubtree',
	kMENUITEM_AUTOHIDE_SEPARATOR       : 'context-separator-toggleAutoHide',
	kMENUITEM_AUTOHIDE                 : 'context-item-toggleAutoHide',
	kMENUITEM_FIXED                    : 'context-item-toggleFixed',
	kMENUITEM_BOOKMARKSUBTREE          : 'context-item-bookmarkTabSubtree',
	
	mTabBrowser : null, 

	indent               : -1,
	indentProp           : 'margin',
	indentTarget         : 'left',
	collapseTarget       : 'top',
	positionProp         : 'screenY',
	sizeProp             : 'height',
	invertedPositionProp : 'screenX',
	invertedSizeProp     : 'width',

	kVERTICAL_MARGIN_RULES_PATTERN   : /margin-(top|bottom):[^;]+;?/g,
	kHORIZONTAL_MARGIN_RULES_PATTERN : /margin-(left|right):[^;]+;?/g,
	get indentRulesRegExp()
	{
		return this.isVertical ?
				this.kHORIZONTAL_MARGIN_RULES_PATTERN :
				this.kVERTICAL_MARGIN_RULES_PATTERN ;
	},
	get collapseRulesRegExp()
	{
		return this.isVertical ?
				this.kVERTICAL_MARGIN_RULES_PATTERN :
				this.kHORIZONTAL_MARGIN_RULES_PATTERN ;
	},
 
	get browser() 
	{
		return this.mTabBrowser;
	},
 
	get container() 
	{
		if (!this._container) {
			this._container = document.getElementById('appcontent');
		}
		return this._container;
	},
	_container : null,
 
	get scrollBox() 
	{
		if (!this._scrollBox) {
			this._scrollBox = ( // Tab Mix Plus
					this.getTreePref('compatibility.TMP') &&
					document.getAnonymousElementByAttribute(this.mTabBrowser.mTabContainer, 'class', 'tabs-frame')
				) ||
				this.mTabBrowser.mTabContainer.mTabstrip;
		}
		return this._scrollBox;
	},
	_scrollBox : null,
	get scrollBoxObject()
	{
		return (this.scrollBox.scrollBoxObject || this.scrollBox.boxObject)
				.QueryInterface(Components.interfaces.nsIScrollBoxObject); // Tab Mix Plus (ensure scrollbox-ed)
	},
 
/* utils */ 
	
/* get tab contents */ 
	
	getTabLabel : function TSTBrowser_getTabLabel(aTab) 
	{
		var label = document.getAnonymousElementByAttribute(aTab, 'class', 'tab-text-stack') || // Mac OS X
					( // Tab Mix Plus
						this.getTreePref('compatibility.TMP') &&
						document.getAnonymousElementByAttribute(aTab, 'class', 'tab-text-container')
					) ||
					document.getAnonymousElementByAttribute(aTab, 'class', 'tab-text');
		return label;
	},
 
	getTabClosebox : function TSTBrowser_getTabClosebox(aTab) 
	{
		var close = ( // Tab Mix Plus
						this.getTreePref('compatibility.TMP') &&
						document.getAnonymousElementByAttribute(aTab, 'class', 'tab-close-button always-right')
					) ||
					document.getAnonymousElementByAttribute(aTab, 'class', 'tab-close-button');
		return close;
	},
  
/* status */ 
	
	get isVertical() 
	{
		var b = this.mTabBrowser;
		if (!b) return false;
		var box = this.scrollBox || b.mTabContainer ;
		return (box.getAttribute('orient') || window.getComputedStyle(box, '').getPropertyValue('-moz-box-orient')) == 'vertical';
	},
 
	isTabInViewport : function TSTBrowser_isTabInViewport(aTab) 
	{
		if (!aTab) return false;
		var tabBox = aTab.boxObject;
		var barBox = this.scrollBox.boxObject;
		var xOffset = this.getXOffsetOfTab(aTab);
		var yOffset = this.getYOffsetOfTab(aTab);
		return (tabBox.screenX + xOffset >= barBox.screenX &&
			tabBox.screenX + xOffset + tabBox.width <= barBox.screenX + barBox.width &&
			tabBox.screenY + yOffset >= barBox.screenY &&
			tabBox.screenY + yOffset + tabBox.height <= barBox.screenY + barBox.height);
	},
  
	isMultiRow : function TSTBrowser_isMultiRow() 
	{
		return false;
	},
  
/* initialize */ 
	
	init : function TSTBrowser_init() 
	{
		var b = this.mTabBrowser;

		this.internallyTabMovingCount = 0;
		this.subTreeMovingCount = 0;
		this.subTreeChildrenMovingCount = 0;
		this._treeViewEnabled = true;

		let (toggler) {
			toggler = document.getAnonymousElementByAttribute(b, 'class', this.kTABBAR_TOGGLER);
			if (!toggler) {
				toggler = document.createElement('spacer');
				toggler.setAttribute('class', this.kTABBAR_TOGGLER);
				b.mStrip.parentNode.insertBefore(toggler, b.mStrip);
			}
		}

		let position = this.currentTabbarPosition;
		this.fireTabbarPositionEvent('TreeStyleTabTabbarPositionChanging', 'top', position); /* PUBLIC API */

		this.initTabbar();

		b.addEventListener('TabOpen',        this, true);
		b.addEventListener('TabClose',       this, true);
		b.addEventListener('TabMove',        this, true);
		b.addEventListener('SSTabRestoring', this, true);
		b.addEventListener('SSTabRestored',  this, true);
		b.mStrip.addEventListener('draggesture', this, false);
		b.mStrip.addEventListener('dragenter', this, false);
		b.mStrip.addEventListener('dragexit', this, false);
		b.mStrip.addEventListener('dragend', this, false);
		b.mStrip.addEventListener('dragover', this, false);
		b.mStrip.addEventListener('dragdrop', this, false);
		b.mTabContainer.addEventListener('mouseover', this, true);
		b.mTabContainer.addEventListener('mouseout', this, true);
		b.mTabContainer.addEventListener('click', this, true);
		b.mTabContainer.addEventListener('dblclick', this, true);
		b.mTabContainer.addEventListener('mousedown', this, true);
		b.mTabContainer.addEventListener('select', this, true);
		b.mTabContainer.addEventListener('scroll', this, true);
		b.mPanelContainer.addEventListener('dragexit', this, false);
		b.mPanelContainer.addEventListener('dragover', this, false);
		b.mPanelContainer.addEventListener('dragdrop', this, false);


		/* Closing collapsed last tree breaks selected tab.
		   To solve this problem, I override the setter to
		   force to set a tab and forbid it becomes null. */
		let (getter, setter) {
			getter = b.__lookupGetter__('selectedTab');
			setter = b.__lookupSetter__('selectedTab');
			eval('setter = '+setter.toSource().replace(
				'{',
				<![CDATA[$&
					if (!val) {
						val = TreeStyleTabService.getLastTab(this);
					}
				]]>.toString()
			));
			/* We have to use both __defineSetter__ and __defineGetter__
			   just in same time!! If we update only setter,
			   getter will be vanished. */
			b.__defineGetter__('selectedTab', getter);
			b.__defineSetter__('selectedTab', setter);
			getter = null;
			setter = null;
		}


		eval('b.mTabContainer._selectNewTab = '+
			b.mTabContainer._selectNewTab.toSource().replace(
				'{',
				<![CDATA[$&
					if (arguments[0].__treestyletab__preventSelect) {
						arguments[0].__treestyletab__preventSelect = false;
						return;
					}
				]]>
			)
		);

		eval('b.mTabContainer.adjustTabstrip = '+
			b.mTabContainer.adjustTabstrip.toSource().replace(
				/(\}\)?)$/,
				<![CDATA[
					var b = TreeStyleTabService.getTabBrowserFromChild(this);
					b.treeStyleTab.updateInvertedTabContentsOrder(true);
				$1]]>
			)
		);

		eval('b.mTabContainer.advanceSelectedTab = '+
			b.mTabContainer.advanceSelectedTab.toSource().replace(
				'{',
				<![CDATA[$&
					var treeStyleTab = TreeStyleTabService.getTabBrowserFromChild(this).treeStyleTab;
					treeStyleTab._focusChangedByShortcut = TreeStyleTabService.accelKeyPressed;
					if (treeStyleTab.canCollapseSubtree() &&
						treeStyleTab.getTreePref('focusMode') == treeStyleTab.kFOCUS_VISIBLE) {
						(function(aDir, aWrap, aSelf) {
							var nextTab = (aDir < 0) ? treeStyleTab.getPreviousVisibleTab(aSelf.selectedItem) : treeStyleTab.getNextVisibleTab(aSelf.selectedItem) ;
							if (!nextTab && aWrap) {
								nextTab = TreeStyleTabService.evaluateXPath(
										'child::xul:tab[not(@'+TreeStyleTabService.kCOLLAPSED+'="true")]['+
										(aDir < 0 ? 'last()' : '1' )+
										']',
										aSelf,
										XPathResult.FIRST_ORDERED_NODE_TYPE
									).singleNodeValue;
							}
							if (nextTab && nextTab != aSelf.selectedItem) {
								aSelf._selectNewTab(nextTab, aDir, aWrap);
							}
						})(arguments[0], arguments[1], this);
						return;
					}
				]]>
			)
		);

		eval('b.mTabContainer._handleTabSelect = '+
			b.mTabContainer._handleTabSelect.toSource().replace(
				'{',
				<![CDATA[$&
					if ((function(aTabs) {
							var treeStyleTab = TreeStyleTabService.getTabBrowserFromChild(aTabs).treeStyleTab;
							var tab = aTabs.selectedItem;
							if (!treeStyleTab.isTabInViewport(tab)) {
								treeStyleTab.scrollToTab(tab);
								return true;
							}
							return false;
						})(this)) {
						return;
					}
				]]>
			)
		);

/*
		if ('ensureElementIsVisible' in b.mTabContainer.mTabstrip &&
			'_smoothScrollByPixels' in b.mTabContainer.mTabstrip) {
			eval('b.mTabContainer.mTabstrip.ensureElementIsVisible = '+
				b.mTabContainer.mTabstrip.ensureElementIsVisible.toSource().replace(
					'{',
					<![CDATA[$&
						var browser = TreeStyleTabService.getTabBrowserFromChild(this);
						var startProp = browser.treeStyleTab.isVertical ? 'top' : 'left' ;
						var endProp = browser.treeStyleTab.isVertical ? 'bottom' : 'right' ;
					]]>
				).replace(
					/\.left/g, '[startProp]'
				).replace(
					/\.right/g, '[endProp]'
				).replace(
					'|| this.getAttribute("orient") == "vertical"', ''
				)
			);
			eval('b.mTabContainer.mTabstrip._smoothScrollByPixels = '+
				b.mTabContainer.mTabstrip._smoothScrollByPixels.toSource().replace(
					'{',
					<![CDATA[$&
						var TST = TreeStyleTabService.getTabBrowserFromChild(this);
					]]>
				).replace(
					'scrollBy(distance, 0)',
					<![CDATA[scrollBy(
						(TST.isVertical ? 0 : distance ),
						(TST.isVertical ? distance : 0 )
					)]]>
				)
			);
		}
*/

		eval('b.mTabContainer._notifyBackgroundTab = '+
			b.mTabContainer._notifyBackgroundTab.toSource().replace(
				'{',
				'{ var treeStyleTab = TreeStyleTabService.getTabBrowserFromChild(this).treeStyleTab;'
			).replace(
				/\.screenX/g, '[treeStyleTab.positionProp]'
			).replace(
				/\.width/g, '[treeStyleTab.sizeProp]'
			)
		);

		this.updateTabDNDObserver(b);

		eval('b.getNewIndex = '+
			b.getNewIndex.toSource().replace(
				/\.screenX/g, '[this.treeStyleTab.positionProp]'
			).replace(
				/\.width/g, '[this.treeStyleTab.sizeProp]'
			)
		);

		eval('b.moveTabForward = '+
			b.moveTabForward.toSource().replace(
				'{', '{ var nextTab;'
			).replace(
				'tabPos < this.browsers.length - 1',
				'nextTab = this.treeStyleTab.getNextSiblingTab(this.mCurrentTab)'
			).replace(
				'tabPos + 1', 'nextTab._tPos'
			).replace(
				'this.moveTabTo(',
				<![CDATA[
					var descendant = this.treeStyleTab.getDescendantTabs(nextTab);
					if (descendant.length) {
						nextTab = descendant[descendant.length-1];
					}
					$&]]>
			).replace(
				'this.moveTabToStart();',
				<![CDATA[
					this.treeStyleTab.internallyTabMovingCount++;
					var parentTab = this.treeStyleTab.getParentTab(this.mCurrentTab);
					if (parentTab) {
						this.moveTabTo(this.mCurrentTab, this.treeStyleTab.getFirstChildTab(parentTab)._tPos);
						this.mCurrentTab.focus();
					}
					else {
						$&
					}
					this.treeStyleTab.internallyTabMovingCount--;
				]]>
			)
		);

		eval('b.moveTabBackward = '+
			b.moveTabBackward.toSource().replace(
				'{', '{ var prevTab;'
			).replace(
				'tabPos > 0',
				'prevTab = this.treeStyleTab.getPreviousSiblingTab(this.mCurrentTab)'
			).replace(
				'tabPos - 1', 'prevTab._tPos'
			).replace(
				'this.moveTabToEnd();',
				<![CDATA[
					this.treeStyleTab.internallyTabMovingCount++;
					var parentTab = this.treeStyleTab.getParentTab(this.mCurrentTab);
					if (parentTab) {
						this.moveTabTo(this.mCurrentTab, this.treeStyleTab.getLastChildTab(parentTab)._tPos);
						this.mCurrentTab.focus();
					}
					else {
						$&
					}
					this.treeStyleTab.internallyTabMovingCount--;
				]]>
			)
		);

		eval('b._keyEventHandler.handleEvent = '+
			b._keyEventHandler.handleEvent.toSource().replace(
				'this.tabbrowser.moveTabOver(aEvent);',
				<![CDATA[
					if (!this.tabbrowser.treeStyleTab.isVertical ||
						!this.tabbrowser.treeStyleTab.moveTabLevel(aEvent)) {
						$&
					}
				]]>
			).replace(
				'this.tabbrowser.moveTabForward();',
				<![CDATA[
					if (this.tabbrowser.treeStyleTab.isVertical ||
						!this.tabbrowser.treeStyleTab.moveTabLevel(aEvent)) {
						$&
					}
				]]>
			).replace(
				'this.tabbrowser.moveTabBackward();',
				<![CDATA[
					if (this.tabbrowser.treeStyleTab.isVertical ||
						!this.tabbrowser.treeStyleTab.moveTabLevel(aEvent)) {
						$&
					}
				]]>
			)
		);

		eval('b.loadTabs = '+
			b.loadTabs.toSource().replace(
				'var tabNum = ',
				<![CDATA[
					if (this.treeStyleTab.readiedToAttachNewTabGroup)
						TreeStyleTabService.readyToOpenChildTab(firstTabAdded || this.selectedTab, true);
					$&]]>
			).replace(
				'if (!aLoadInBackground)',
				<![CDATA[
					if (TreeStyleTabService.checkToOpenChildTab(this))
						TreeStyleTabService.stopToOpenChildTab(this);
					$&]]>
			).replace(
				'this.selectedTab = firstTabAdded;',
				<![CDATA[
					this.selectedTab = aURIs[0].indexOf('about:treestyletab-group') < 0 ?
						firstTabAdded :
						TreeStyleTabService.getNextTab(firstTabAdded) ;
				]]>
			)
		);

		eval('b.createTooltip = '+
			b.createTooltip.toSource().replace(
				'if ("mOverCloseButton" in tn && tn.mOverCloseButton) {',
				<![CDATA[
					if (TreeStyleTabService.getTabBrowserFromChild(tn) &&
						TreeStyleTabService.getTabBrowserFromChild(tn).treeStyleTab.handleTooltip(event, tn)) {
						return true;
					}
					else $&]]>
			)
		);

		eval('b.onTabBarDblClick = '+
			b.onTabBarDblClick.toSource().replace(
				'aEvent.originalTarget.localName == "box"',
				'/^(box|(arrow)?scrollbox|tabs)$/.test(aEvent.originalTarget.localName)'
			)
		);

		if ('_onDragEnd' in b) {
			eval('b._onDragEnd = '+b._onDragEnd.toSource().replace(
				/(this\._?replaceTabWithWindow\()/,
				'if (this.treeStyleTab.isDraggingAllTabs(draggedTab)) return; $1'
			).replace(
				'{',
				'{ var treeStyleTab = this.treeStyleTab;'
			).replace(
				/window\.screenX/g, 'gBrowser.boxObject.screenX'
			).replace(
				/window\.outerWidth/g, 'gBrowser.boxObject.width'
			).replace(
				/\.screenX/g, '[treeStyleTab.positionProp]'
			).replace(
				/\.width/g, '[treeStyleTab.sizeProp]'
			).replace(
				/\.screenY/g, '[treeStyleTab.invertedPositionProp]'
			).replace(
				/\.height/g, '[treeStyleTab.invertedSizeProp]'
			));
		}

		if ('_beginRemoveTab' in b) {
			eval('b._beginRemoveTab = '+
				b._beginRemoveTab.toSource().replace(
					'if (l == 1) {',
					'if (l == 1 || this.treeStyleTab.shouldCloseLastTabSubtreeOf(aTab)) {'
				).replace(
					'this._removingTabs.length == 0',
					'(this.treeStyleTab.shouldCloseLastTabSubtreeOf(aTab) || $&)'
				)
			);
		}

		eval('b.removeCurrentTab = '+b.removeCurrentTab.toSource().replace(
			'{',
			'{ if (!this.treeStyleTab.warnAboutClosingTabSubtreeOf(this.selectedTab)) return;'
		));

		let (tabs, i, maxi) {
			tabs = this.getTabs(b);
			for (i = 0, maxi = tabs.snapshotLength; i < maxi; i++)
			{
				this.initTab(tabs.snapshotItem(i));
			}
		}

		this.onPrefChange('extensions.treestyletab.tabbar.style');
		this.onPrefChange('extensions.treestyletab.twisty.style');
		this.onPrefChange('extensions.treestyletab.showBorderForFirstTab');
		this.onPrefChange('extensions.treestyletab.tabbar.invertTabContents');
		this.onPrefChange('extensions.treestyletab.tabbar.invertClosebox');

		var tabContextMenu = document.getAnonymousElementByAttribute(b, 'anonid', 'tabContextMenu');
		tabContextMenu.addEventListener('popupshowing', this, false);
		if (!('MultipleTabService' in window)) {
			window.setTimeout(function(aSelf, aTabBrowser, aPopup) {
				let suffix = '-tabbrowser-'+(aTabBrowser.id || 'instance-'+parseInt(Math.random() * 65000));
				[
					aSelf.kMENUITEM_RELOADSUBTREE,
					aSelf.kMENUITEM_RELOADCHILDREN,
					aSelf.kMENUITEM_REMOVESUBTREE,
					aSelf.kMENUITEM_REMOVECHILDREN,
					aSelf.kMENUITEM_COLLAPSEEXPAND_SEPARATOR,
					aSelf.kMENUITEM_COLLAPSE,
					aSelf.kMENUITEM_EXPAND,
					aSelf.kMENUITEM_AUTOHIDE_SEPARATOR,
					aSelf.kMENUITEM_AUTOHIDE,
					aSelf.kMENUITEM_FIXED,
					aSelf.kMENUITEM_BOOKMARKSUBTREE
				].forEach(function(aID) {
					let item = document.getElementById(aID).cloneNode(true);
					item.setAttribute('id', item.getAttribute('id')+suffix);

					let refNode = void(0);
					let insertAfter = item.getAttribute('multipletab-insertafter');
					if (insertAfter) {
						try {
							eval('refNode = ('+insertAfter+').nextSibling');
						}
						catch(e) {
						}
					}
					let insertBefore = item.getAttribute('multipletab-insertbefore');
					if (refNode === void(0) && insertBefore) {
						try {
							eval('refNode = '+insertBefore);
						}
						catch(e) {
						}
					}
					aPopup.insertBefore(item, refNode || null);
				});
				tabContextMenu = null;
			}, 0, this, b, tabContextMenu);
		}

		let (removeTabItem = document.getAnonymousElementByAttribute(b, 'id', 'context_closeTab')) {
			if (removeTabItem) {
				removeTabItem.setAttribute(
					'oncommand',
					removeTabItem.getAttribute('oncommand').replace(
						/(tabbrowser\.removeTab\(([^\)]+)\))/,
						'if (tabbrowser.treeStyleTab.warnAboutClosingTabSubtreeOf($2)) $1'
					)
				);
			}
		}

		let (allTabPopup = document.getAnonymousElementByAttribute(b.mTabContainer, 'anonid', 'alltabs-popup')) {
			if (allTabPopup)
				allTabPopup.addEventListener('popupshowing', this, false);
		}

		/* To move up content area on the tab bar, switch tab.
		   If we don't do it, a gray space appears on the content area
		   by negative margin of it. */
		if (b.getAttribute(this.kTABBAR_POSITION) == 'left' &&
			b.getAttribute(this.kSCROLLBAR_INVERTED) == 'true') {
			b.removeTab(
				b.selectedTab = b.addTab('about:blank')
			);
		}

		this.ObserverService.addObserver(this, 'TreeStyleTab:indentModified', false);
		this.ObserverService.addObserver(this, 'TreeStyleTab:collapseExpandAllSubtree', false);
		this.ObserverService.addObserver(this, 'TreeStyleTab:changeTreeViewAvailability', false);
		this.addPrefListener(this);

		this.autoHide;

		this.fireTabbarPositionEvent('TreeStyleTabTabbarPositionChanged', 'top', position); /* PUBLIC API */

		b = null;
	},
	
	initTab : function TSTBrowser_initTab(aTab) 
	{
		if (!aTab.hasAttribute(this.kID)) {
			var id = this.getTabValue(aTab, this.kID) || this.makeNewId();
			aTab.setAttribute(this.kID, id);
			aTab.setAttribute(this.kSUBTREE_COLLAPSED, true);
			window.setTimeout(function(aSelf) {
				if (!aSelf.getTabValue(aTab, aSelf.kID))
					aSelf.setTabValue(aTab, aSelf.kID, id);
			}, 0, this);
		}

		aTab.__treestyletab__linkedTabBrowser = this.mTabBrowser;

		this.initTabAttributes(aTab);
		this.initTabContents(aTab);

		aTab.setAttribute(this.kNEST, 0);
	},
	isTabInitialized : function TSTBrowser_isTabInitialized(aTab)
	{
		return aTab.getAttribute(this.kID);
	},
	ensureTabInitialized : function TSTBrowser_ensureTabInitialized(aTab)
	{
		if (!aTab || this.isTabInitialized(aTab)) return;
		this.initTab(aTab);
	},
	
	initTabAttributes : function TSTBrowser_initTabAttributes(aTab) 
	{
		var pos = this.mTabBrowser.getAttribute(this.kTABBAR_POSITION);
		if (pos == 'left' || pos == 'right') {
			aTab.setAttribute('align', 'stretch');
			aTab.removeAttribute('maxwidth');
			aTab.removeAttribute('minwidth');
			aTab.removeAttribute('width');
			aTab.removeAttribute('flex');
			aTab.maxWidth = 65000;
			aTab.minWidth = 0;
			if (this.getTreePref('compatibility.TMP'))
				aTab.setAttribute('dir', 'ltr'); // Tab Mix Plus
		}
		else {
			aTab.removeAttribute('align');
			aTab.setAttribute('maxwidth', 250);
			aTab.setAttribute('minwidth', this.mTabBrowser.mTabContainer.mTabMinWidth);
			aTab.setAttribute('width', '0');
			aTab.setAttribute('flex', 100);
			aTab.maxWidth = 250;
			aTab.minWidth = this.mTabBrowser.mTabContainer.mTabMinWidth;
			if (this.getTreePref('compatibility.TMP'))
				aTab.removeAttribute('dir'); // Tab Mix Plus
		}
	},
 
	initTabContents : function TSTBrowser_initTabContents(aTab) 
	{
		var icon  = document.getAnonymousElementByAttribute(aTab, 'class', 'tab-icon');
		var label = this.getTabLabel(aTab);
		var close = this.getTabClosebox(aTab);
		var counter = document.getAnonymousElementByAttribute(aTab, 'class', this.kCOUNTER_CONTAINER);

		if (!document.getAnonymousElementByAttribute(aTab, 'class', this.kTWISTY)) {
			var twisty = document.createElement('image');
			twisty.setAttribute('class', this.kTWISTY);
			var container = document.createElement('hbox');
			container.setAttribute('class', this.kTWISTY_CONTAINER);
			container.appendChild(twisty);

			icon.appendChild(container);

			var marker = document.createElement('image');
			marker.setAttribute('class', this.kDROP_MARKER);
			container = document.createElement('hbox');
			container.setAttribute('class', this.kDROP_MARKER_CONTAINER);
			container.appendChild(marker);

			icon.appendChild(container);
		}

		if (!counter) {
			var counter = document.createElement('hbox');
			counter.setAttribute('class', this.kCOUNTER_CONTAINER);

			counter.appendChild(document.createElement('label'));
			counter.lastChild.setAttribute('class', this.kCOUNTER);
			counter.lastChild.setAttribute('value', '(0)');

			if (label) {
				label.parentNode.insertBefore(counter, label.nextSibling);
			}
		}
		this.initTabContentsOrder(aTab);
	},
 
	initTabContentsOrder : function TSTBrowser_initTabContentsOrder(aTab) 
	{
		var label = this.getTabLabel(aTab);
		var close = this.getTabClosebox(aTab);
		var counter = document.getAnonymousElementByAttribute(aTab, 'class', this.kCOUNTER_CONTAINER);
		var inverted = this.mTabBrowser.getAttribute(this.kTAB_CONTENTS_INVERTED) == 'true';

		var nodes = Array.slice(document.getAnonymousNodes(aTab));

		// reset order
		nodes.forEach(function(aNode, aIndex) {
			aNode.setAttribute('ordinal', aIndex);
		}, this);

		// rearrange top-level contents
		nodes.splice(nodes.indexOf(close), 1);
		if (inverted) {
			if (this.mTabBrowser.getAttribute(this.kCLOSEBOX_INVERTED) == 'true')
				nodes.splice(nodes.indexOf(label.parentNode)+1, 0, close);
			else
				nodes.splice(nodes.indexOf(label.parentNode), 0, close);
		}
		else {
			if (this.mTabBrowser.getAttribute(this.kCLOSEBOX_INVERTED) == 'true')
				nodes.splice(nodes.indexOf(label.parentNode), 0, close);
			else
				nodes.splice(nodes.indexOf(label.parentNode)+1, 0, close);
		}
		var count = nodes.length;
		Array.slice(nodes).reverse()
			.forEach(function(aNode, aIndex) {
				aNode.setAttribute('ordinal', (count - aIndex + 1) * 100);
			}, this);

		// rearrange contents in "tab-image-middle"
		nodes = Array.slice(label.parentNode.childNodes);
		nodes.splice(nodes.indexOf(counter), 1);
		if (inverted) nodes.reverse();
		nodes.splice(nodes.indexOf(label)+1, 0, counter);
		count = nodes.length;
		nodes.reverse().forEach(function(aNode, aIndex) {
			if (aNode.getAttribute('class') == 'informationaltab-thumbnail-container')
				return;
			aNode.setAttribute('ordinal', (count - aIndex + 1) * 100);
		}, this);
	},
 
	updateInvertedTabContentsOrder : function TSTBrowser_updateInvertedTabContentsOrder(aAll) 
	{
		if (!this.getTreePref('tabbar.invertTabContents')) return;
		window.setTimeout(function(aSelf) {
			var b = aSelf.mTabBrowser;
			var tabs = aAll ? aSelf.getTabsArray(b) : [b.selectedTab] ;
			tabs.forEach(function(aTab) {
				aSelf.initTabContentsOrder(aTab);
			});
			b = null;
			tabs = null;
		}, 0, this);
	},
  
	initTabbar : function TSTBrowser_initTabbar(aPosition) 
	{
		this.stopRendering();

		var b = this.mTabBrowser;

		if (!aPosition) aPosition = this.currentTabbarPosition;
		aPosition = String(aPosition).toLowerCase();

		if (b.getAttribute('id') != 'content' &&
			!this.getTreePref('tabbar.position.subbrowser.enabled')) {
			aPosition = 'top';
		}

		var pos = (aPosition == 'left') ? this.kTABBAR_LEFT :
			(aPosition == 'right') ? this.kTABBAR_RIGHT :
			(aPosition == 'bottom') ? this.kTABBAR_BOTTOM :
			this.kTABBAR_TOP;

		var splitter = this._ensureNewSplitter();
		var toggler = document.getAnonymousElementByAttribute(b, 'class', this.kTABBAR_TOGGLER);

		// Tab Mix Plus
		var scrollFrame, newTabBox, tabBarMode;
		if (this.getTreePref('compatibility.TMP')) {
			scrollFrame = document.getAnonymousElementByAttribute(b.mTabContainer, 'class', 'tabs-frame') ||
							document.getAnonymousElementByAttribute(b.mTabContainer, 'anonid', 'scroll-tabs-frame');
			newTabBox = document.getAnonymousElementByAttribute(b.mTabContainer, 'id', 'tabs-newbutton-box');
			tabBarMode = this.getPref('extensions.tabmix.tabBarMode');
		}

		// All-in-One Sidebar
		var toolboxContainer = document.getAnonymousElementByAttribute(b.mStrip, 'anonid', 'aiostbx-toolbox-tableft');
		if (toolboxContainer) toolboxContainer = toolboxContainer.parentNode;

		var scrollInnerBox = b.mTabContainer.mTabstrip._scrollbox ?
				document.getAnonymousNodes(b.mTabContainer.mTabstrip._scrollbox)[0] :
				scrollFrame; // Tab Mix Plus
		var allTabsButton = document.getAnonymousElementByAttribute(b.mTabContainer, 'class', 'tabs-alltabs-button') ||
				( // Tab Mix Plus
					this.getTreePref('compatibility.TMP') &&
					document.getAnonymousElementByAttribute(b.mTabContainer, 'anonid', 'alltabs-button')
				);

		b.removeAttribute(this.kRESIZING);

		b.mStrip.removeAttribute('width');
		b.mPanelContainer.removeAttribute('width');

		var delayedPostProcess;

		if (pos & this.kTABBAR_VERTICAL) {

			this.collapseTarget       = 'top';
			this.positionProp         = 'screenY';
			this.sizeProp             = 'height';
			this.invertedPositionProp = 'screenX';
			this.invertedSizeProp     = 'width';

			b.mTabBox.orient = splitter.orient = 'horizontal';
			b.mStrip.orient =
				toggler.orient =
				b.mTabContainer.orient =
				b.mTabContainer.mTabstrip.orient =
				b.mTabContainer.mTabstrip.parentNode.orient = 'vertical';
			if (allTabsButton && allTabsButton.hasChildNodes()) {
				allTabsButton.firstChild.setAttribute('position', 'before_start');
			}
			b.mTabContainer.setAttribute('align', 'stretch'); // for Mac OS X
			if (scrollInnerBox)
				scrollInnerBox.removeAttribute('flex');

			if (this.getTreePref('compatibility.TMP') && scrollFrame) { // Tab Mix Plus
				document.getAnonymousNodes(scrollFrame)[0].removeAttribute('flex');
				scrollFrame.parentNode.orient =
					scrollFrame.orient = 'vertical';
				newTabBox.orient = 'horizontal';
				if (tabBarMode == 2)
					this.setPref('extensions.tabmix.tabBarMode', 1);
			}

			if (toolboxContainer)
				toolboxContainer.orient = 'vertical';

			b.setAttribute(this.kMODE, 'vertical');

			b.mStrip.setAttribute('width', this.getTreePref('tabbar.width'));
			b.mStrip.removeAttribute('height');
			b.mPanelContainer.removeAttribute('height');

			if (pos == this.kTABBAR_RIGHT) {
				b.setAttribute(this.kTABBAR_POSITION, 'right');
				if (this.getTreePref('tabbar.invertTab')) {
					b.setAttribute(this.kTAB_INVERTED, 'true');
					this.indentTarget = 'right';
				}
				else {
					b.removeAttribute(this.kTAB_INVERTED);
					this.indentTarget = 'left';
				}
				delayedPostProcess = function(aSelf, aTabBrowser, aSplitter, aToggler) {
					/* in Firefox 3, the width of the rightside tab bar
					   unexpectedly becomes 0 on the startup. so, we have
					   to set the width again. */
					aTabBrowser.mStrip.setAttribute('width', aSelf.getTreePref('tabbar.width'));
					aTabBrowser.mTabDropIndicatorBar.setAttribute('ordinal', 1);
					aTabBrowser.mStrip.setAttribute('ordinal', 30);
					aSplitter.setAttribute('ordinal', 20);
					aToggler.setAttribute('ordinal', 40);
					aTabBrowser.mPanelContainer.setAttribute('ordinal', 10);
					aSplitter.setAttribute('collapse', 'after');
				};
			}
			else {
				b.setAttribute(this.kTABBAR_POSITION, 'left');
				b.removeAttribute(this.kTAB_INVERTED);
				this.indentTarget = 'left';
				delayedPostProcess = function(aSelf, aTabBrowser, aSplitter, aToggler) {
					aTabBrowser.mTabDropIndicatorBar.setAttribute('ordinal', 1);
					aTabBrowser.mStrip.setAttribute('ordinal', 10);
					aSplitter.setAttribute('ordinal', 20);
					aToggler.setAttribute('ordinal', 5);
					aTabBrowser.mPanelContainer.setAttribute('ordinal', 30);
					aSplitter.setAttribute('collapse', 'before');
				};
			}
		}
		else {
			this.collapseTarget       = 'left';
			this.positionProp         = 'screenX';
			this.sizeProp             = 'width';
			this.invertedPositionProp = 'screenY';
			this.invertedSizeProp     = 'height';

			b.mTabBox.orient = splitter.orient = 'vertical';
			b.mStrip.orient =
				toggler.orient =
				b.mTabContainer.orient =
				b.mTabContainer.mTabstrip.orient =
				b.mTabContainer.mTabstrip.parentNode.orient = 'horizontal';
			if (allTabsButton && allTabsButton.hasChildNodes()) {
				allTabsButton.firstChild.setAttribute('position', 'after_end');
			}
			b.mTabContainer.removeAttribute('align'); // for Mac OS X
			if (scrollInnerBox)
				scrollInnerBox.setAttribute('flex', 1);

			if (this.getTreePref('compatibility.TMP') && scrollFrame) { // Tab Mix Plus
				document.getAnonymousNodes(scrollFrame)[0].setAttribute('flex', 1);
				scrollFrame.parentNode.orient =
					scrollFrame.orient = 'horizontal';
				newTabBox.orient = 'vertical';
			}

			if (toolboxContainer)
				toolboxContainer.orient = 'horizontal';

			b.setAttribute(this.kMODE, this.getTreePref('tabbar.multirow') ? 'multirow' : 'horizontal' );
			b.removeAttribute(this.kTAB_INVERTED);

			if (pos == this.kTABBAR_BOTTOM) {
				b.setAttribute(this.kTABBAR_POSITION, 'bottom');
				this.indentTarget = 'bottom';
				delayedPostProcess = function(aSelf, aTabBrowser, aSplitter, aToggler) {
					aTabBrowser.mTabDropIndicatorBar.setAttribute('ordinal', 1);
					aTabBrowser.mStrip.setAttribute('ordinal', 30);
					aSplitter.setAttribute('ordinal', 20);
					aToggler.setAttribute('ordinal', 40);
					aTabBrowser.mPanelContainer.setAttribute('ordinal', 10);
				};
			}
			else {
				b.setAttribute(this.kTABBAR_POSITION, 'top');
				this.indentTarget = 'top';
				delayedPostProcess = function(aSelf, aTabBrowser, aSplitter, aToggler) {
					aTabBrowser.mTabDropIndicatorBar.setAttribute('ordinal', 1);
					aTabBrowser.mStrip.setAttribute('ordinal', 10);
					aSplitter.setAttribute('ordinal', 20);
					aToggler.setAttribute('ordinal', 5);
					aTabBrowser.mPanelContainer.setAttribute('ordinal', 30);
				};
			}
		}

		this.indentProp = this.getTreePref('indent.property');

		this.getTabsArray(b).forEach(function(aTab) {
			this.updateTabCollapsed(aTab, aTab.getAttribute(this.kCOLLAPSED) == 'true', true);
		}, this);

		this.updateTabbarState();
		window.setTimeout(function(aSelf, aTabBrowser, aSplitter, aToggler) {
			delayedPostProcess(aSelf, aTabBrowser, aSplitter, aToggler);
			aSelf.updateTabbarOverflow();
			delayedPostProcess = null;
		}, 0, this, b, splitter, toggler);

		b = null;
		pos = null;
		splitter = null;
		toggler = null;
		scrollFrame = null;
		newTabBox = null
		tabBarMode = null;
		toolboxContainer = null;
		scrollInnerBox = null;
		scrollInnerBox = null;
		allTabsButton = null;

		this.startRendering();
	},
	
	_ensureNewSplitter : function TSTBrowser__ensureNewSplitter() 
	{
		var splitter = document.getAnonymousElementByAttribute(this.mTabBrowser, 'class', this.kSPLITTER);

		// We always have to re-create splitter, because its "collapse"
		// behavior becomes broken by repositioning of the tab bar.
		if (splitter) {
			splitter.parentNode.removeChild(splitter);
			splitter.removeEventListener('mousedown', this, true);
		}

		splitter = document.createElement('splitter');
		splitter.setAttribute('class', this.kSPLITTER);
		splitter.addEventListener('mousedown', this, true);
		splitter.setAttribute('onclick', 'TreeStyleTabService.onTabbarResizerClick(event);');
		splitter.setAttribute('onmouseup', 'TreeStyleTabService.onTabbarResized(event);');
		splitter.setAttribute('state', 'open');
		splitter.appendChild(document.createElement('grippy'));

		var ref = this.mTabBrowser.mPanelContainer;
		ref.parentNode.insertBefore(splitter, ref);

		return splitter;
	},
 
	updateTabbarState : function TSTBrowser_updateTabbarState() 
	{
		this.stopRendering();

		var b = this.mTabBrowser;
		var orient;
		if (this.isVertical) {
			orient = 'vertical';
			if (this.getTreePref('tabbar.fixed.vertical'))
				b.setAttribute(this.kFIXED, true);
			else
				b.removeAttribute(this.kFIXED);
		}
		else {
			orient = 'horizontal';
			if (this.getTreePref('tabbar.fixed.horizontal')) {
				b.setAttribute(this.kFIXED, true);
				if (!this.isMultiRow()) {
					b.mStrip.removeAttribute('height');
					b.mPanelContainer.removeAttribute('height');
				}
			}
			else {
				b.removeAttribute(this.kFIXED);
				b.mStrip.setAttribute('height', this.getTreePref('tabbar.height'));
			}
		}

		if (this.getTreePref('enableSubtreeIndent.'+orient))
			b.setAttribute(this.kINDENTED, 'true');
		else
			b.removeAttribute(this.kINDENTED);

		if (this.getTreePref('allowSubtreeCollapseExpand.'+orient))
			b.setAttribute(this.kALLOW_COLLAPSE, 'true');
		else
			b.removeAttribute(this.kALLOW_COLLAPSE);

		if (this.getTreePref('tabbar.hideAlltabsButton.'+orient))
			b.setAttribute(this.kHIDE_ALLTABS, 'true');
		else
			b.removeAttribute(this.kHIDE_ALLTABS);

		this.startRendering();
		this.updateAllTabsIndent();
	},
 
	updateTabbarOverflow : function TSTBrowser_updateTabbarOverflow() 
	{
		var b = this.mTabBrowser;
		b.mTabContainer.removeAttribute('overflow'); // Firefox 3.0.x
		var container = document.getAnonymousElementByAttribute(b.mTabContainer, 'class', 'tabs-container');

		if (!container) return;

		container.removeAttribute('overflow');

		var scrollBox = this.scrollBox;
		scrollBox.addEventListener('overflow', this, true);
		scrollBox.addEventListener('underflow', this, true);
		window.setTimeout(function() {
			scrollBox = document.getAnonymousElementByAttribute(scrollBox, 'anonid', 'scrollbox');
			if (scrollBox) scrollBox = document.getAnonymousNodes(scrollBox)[0];
			if (
				scrollBox &&
				(
					scrollBox.boxObject.width > container.boxObject.width ||
					scrollBox.boxObject.height > container.boxObject.height
				)
				) {
				b.mTabContainer.setAttribute('overflow', true); // Firefox 3.0.x
				container.setAttribute('overflow', true);
			}
			else {
				b.mTabContainer.removeAttribute('overflow'); // Firefox 3.0.x
				container.removeAttribute('overflow');
			}
		}, 100);
	},
 
	fireTabbarPositionEvent : function TSTBrowser_fireTabbarPositionEvent(aType, aOldPosition, aNewPosition) 
	{
		if (aOldPosition == aNewPosition) return;

		var event = document.createEvent('Events');
		event.initEvent(aType, true, true);
		event.oldPosition = aOldPosition;
		event.newPosition = aNewPosition;
		this.mTabBrowser.dispatchEvent(event);
	},
   
	destroy : function TSTBrowser_destroy() 
	{
		this.autoHide.destroy();
		delete this._autoHide;

		var b = this.mTabBrowser;

		this.getTabsArray(b).forEach(function(aTab) {
			this.destroyTab(aTab);
		}, this);

		b.removeEventListener('TabOpen',        this, true);
		b.removeEventListener('TabClose',       this, true);
		b.removeEventListener('TabMove',        this, true);
		b.removeEventListener('SSTabRestoring', this, true);
		b.removeEventListener('SSTabRestored',  this, true);
		b.mStrip.removeEventListener('draggesture', this, false);
		b.mStrip.removeEventListener('dragenter', this, false);
		b.mStrip.removeEventListener('dragexit', this, false);
		b.mStrip.removeEventListener('dragend', this, false);
		b.mStrip.removeEventListener('dragover', this, false);
		b.mStrip.removeEventListener('dragdrop', this, false);
		b.mTabContainer.removeEventListener('click', this, true);
		b.mTabContainer.removeEventListener('dblclick', this, true);
		b.mTabContainer.removeEventListener('mousedown', this, true);
		b.mTabContainer.removeEventListener('select', this, true);
		b.mTabContainer.removeEventListener('scroll', this, true);
		b.mPanelContainer.removeEventListener('dragexit', this, false);
		b.mPanelContainer.removeEventListener('dragover', this, false);
		b.mPanelContainer.removeEventListener('dragdrop', this, false);

		this.tabbarDNDObserver.destroy();
		delete this._tabbarDNDObserver;
		this.panelDNDObserver.destroy();
		delete this._panelDNDObserver;

		this.scrollBox.removeEventListener('overflow', this, true);
		this.scrollBox.removeEventListener('underflow', this, true);

		var tabContextMenu = document.getAnonymousElementByAttribute(b, 'anonid', 'tabContextMenu');
		tabContextMenu.removeEventListener('popupshowing', this, false);

		var allTabPopup = document.getAnonymousElementByAttribute(b.mTabContainer, 'anonid', 'alltabs-popup');
		if (allTabPopup) {
			allTabPopup.removeEventListener('popupshowing', this, false);
		}

		if (this.tabbarCanvas) {
			this.tabbarCanvas.parentNode.removeChild(this.tabbarCanvas);
			this.tabbarCanvas = null;
		}

		this.ObserverService.removeObserver(this, 'TreeStyleTab:indentModified');
		this.ObserverService.removeObserver(this, 'TreeStyleTab:collapseExpandAllSubtree');
		this.ObserverService.removeObserver(this, 'TreeStyleTab:changeTreeViewAvailability');
		this.removePrefListener(this);

		delete this.mTabBrowser;
		delete this._scrollBox;
	},
	
	destroyTab : function TSTBrowser_destroyTab(aTab) 
	{
		delete aTab.__treestyletab__linkedTabBrowser;
	},
   
/* nsIObserver */ 
	
	domains : [ 
		'extensions.treestyletab.'
	],
 
	observe : function TSTBrowser_observe(aSubject, aTopic, aData) 
	{
		switch (aTopic)
		{
			case 'TreeStyleTab:indentModified':
				if (this.indent > -1)
					this.updateAllTabsIndent();
				break;

			case 'TreeStyleTab:collapseExpandAllSubtree':
				if (aSubject == window) {
					aData = String(aData);
					this.collapseExpandAllSubtree(
						aData.indexOf('collapse') > -1,
						aData.indexOf('now') > -1
					);
				}
				break;

			case 'TreeStyleTab:changeTreeViewAvailability':
				this.treeViewEnabled = (aData != 'false');
				break;

			case 'nsPref:changed':
				this.onPrefChange(aData);
				break;

			default:
				break;
		}
	},
 
	onPrefChange : function TSTBrowser_onPrefChange(aPrefName) 
	{
		var b = this.mTabBrowser;
		var value = this.getPref(aPrefName);
		var tabContainer = b.mTabContainer;
		var tabs  = this.getTabsArray(b);
		switch (aPrefName)
		{
			case 'extensions.treestyletab.tabbar.position':
				var oldPosition = b.getAttribute(this.kTABBAR_POSITION);
				this.fireTabbarPositionEvent('TreeStyleTabTabbarPositionChanging', oldPosition, value); /* PUBLIC API */
				this.initTabbar();
				tabs.forEach(function(aTab) {
					this.initTabAttributes(aTab);
				}, this);
				tabs.forEach(function(aTab) {
					this.initTabContents(aTab);
				}, this);
				this.fireTabbarPositionEvent('TreeStyleTabTabbarPositionChanged', oldPosition, value); /* PUBLIC API */
				window.setTimeout(function(aSelf) {
					aSelf.checkTabsIndentOverflow();
				}, 0, this);
				break;

			case 'extensions.treestyletab.tabbar.invertTab':
			case 'extensions.treestyletab.tabbar.multirow':
				this.initTabbar();
				this.updateAllTabsIndent();
				tabs.forEach(function(aTab) {
					this.initTabContents(aTab);
				}, this);
				break;
			case 'extensions.treestyletab.tabbar.invertTabContents':
				if (value)
					b.setAttribute(this.kTAB_CONTENTS_INVERTED, 'true');
				else
					b.removeAttribute(this.kTAB_CONTENTS_INVERTED);
				tabs.forEach(function(aTab) {
					this.initTabContents(aTab);
				}, this);
				break;

			case 'extensions.treestyletab.tabbar.invertClosebox':
				if (value)
					b.setAttribute(this.kCLOSEBOX_INVERTED, 'true');
				else
					b.removeAttribute(this.kCLOSEBOX_INVERTED);
				tabs.forEach(function(aTab) {
					this.initTabContents(aTab);
				}, this);
				break;

			case 'extensions.treestyletab.tabbar.style':
				if (value) {
					if (/^(default|vertigo|mixed)$/.test(value))
						value = 'square '+value;
					b.setAttribute(this.kSTYLE, value);
				}
				else {
					b.removeAttribute(this.kSTYLE);
				}
				break;

			case 'extensions.treestyletab.twisty.style':
				if (value == 'auto') {
					if (
						window['piro.sakura.ne.jp'].extensions.isAvailable('informationaltab@piro.sakura.ne.jp') &&
						this.getPref('extensions.informationaltab.thumbnail.enabled') &&
						this.getPref('extensions.informationaltab.thumbnail.position') < 100
						) {
						value = 'retro';
					}
					else {
						value = 'modern-black';
					}
				}
				b.setAttribute(this.kTWISTY_STYLE, value);
				break;

			case 'extensions.treestyletab.showBorderForFirstTab':
				if (value)
					b.setAttribute(this.kFIRSTTAB_BORDER, true);
				else
					b.removeAttribute(this.kFIRSTTAB_BORDER);
				break;

			case 'extensions.treestyletab.enableSubtreeIndent.horizontal':
			case 'extensions.treestyletab.allowSubtreeCollapseExpand.horizontal':
			case 'extensions.treestyletab.tabbar.fixed.horizontal':
			case 'extensions.treestyletab.tabbar.hideAlltabsButton.horizontal':
				if (!this.isVertical) this.updateTabbarState();
				break;

			case 'extensions.treestyletab.enableSubtreeIndent.vertical':
			case 'extensions.treestyletab.allowSubtreeCollapseExpand.vertical':
			case 'extensions.treestyletab.tabbar.fixed.vertical':
			case 'extensions.treestyletab.tabbar.hideAlltabsButton.vertical':
				if (this.isVertical) this.updateTabbarState();
				break;

			case 'extensions.treestyletab.tabbar.width':
			case 'extensions.treestyletab.tabbar.shrunkenWidth':
				if (!this.autoHide.isResizing && this.isVertical) {
					this.mTabBrowser.mStrip.removeAttribute('width');
					this.mTabBrowser.mStrip.setAttribute('width', this.autoHide.widthFromMode);
				}
				this.checkTabsIndentOverflow();
				break;

			case 'extensions.treestyletab.tabbar.height':
				this._horizontalTabMaxIndentBase = 0;
				this.checkTabsIndentOverflow();
				break;

			default:
				break;
		}
	},
  
/* DOM Event Handling */ 
	
	handleEvent : function TSTBrowser_handleEvent(aEvent) 
	{
		switch (aEvent.type)
		{
			case 'TabOpen':
				this.onTabAdded(aEvent);
				return;

			case 'TabClose':
				this.onTabRemoved(aEvent);
				this.updateLastScrollPosition();
				return;

			case 'TabMove':
				this.onTabMove(aEvent);
				return;

			case 'SSTabRestoring':
				this.onTabRestoring(aEvent);
				return;

			case 'SSTabRestored':
				this.onTabRestored(aEvent);
				return;

			case 'select':
				this.onTabSelect(aEvent);
				return;

			case 'click':
				if (aEvent.target.ownerDocument == document)
					this.onTabClick(aEvent);
				return;

			case 'dblclick':
				this.onDblClick(aEvent);
				return;

			case 'mousedown':
				this.onMouseDown(aEvent);
				return;

			case 'scroll':
				this.onScroll(aEvent);
				return;

			case 'popupshowing':
				this.onPopupShowing(aEvent);
				return;


			case 'draggesture':
				nsDragAndDrop.startDrag(aEvent, this.tabbarDNDObserver);
				return;

			case 'dragenter':
				nsDragAndDrop.dragEnter(aEvent, this.tabbarDNDObserver);
				return;

			case 'dragexit':
				nsDragAndDrop.dragExit(
					aEvent,
					aEvent.currentTarget == this.mTabBrowser.mStrip ?
						this.tabbarDNDObserver :
						this.panelDNDObserver
				);
				return;

			case 'dragend':
				this.tabbarDNDObserver.onDragEnd(aEvent);
				return;

			case 'dragover':
			case 'dragdrop':
				let (canDrop, observer) {
					if (aEvent.currentTarget == this.mTabBrowser.mStrip) {
						observer = this.tabbarDNDObserver;
						canDrop = true;
					}
					else {
						observer = this.panelDNDObserver;
						canDrop = observer.canDrop(aEvent, this.getCurrentDragSession());
					}
					// don't use nsDragAndDrop if it can't be dropped!!
					// http://piro.sakura.ne.jp/latest/blosxom/mozilla/xul/2007-02-02_splitbrowser-dragdrop.htm
					if (canDrop)
						nsDragAndDrop[aEvent.type == 'dragover' ? 'dragOver' : 'drop' ](aEvent, observer);
				}
				return;


			case 'mouseover':
				if (this.isEventFiredOnTwisty(aEvent))
					aEvent.target.setAttribute(this.kTWISTY_HOVER, true);
				return;

			case 'mouseout':
				if (this.isEventFiredOnTwisty(aEvent))
					aEvent.target.removeAttribute(this.kTWISTY_HOVER);
				return;

			case 'overflow':
			case 'underflow':
				this.onTabbarOverflow(aEvent);
				return;
		}
	},
	lastScrollX : -1,
	lastScrollY : -1,
	
	updateLastScrollPosition : function TSTBrowser_updateLastScrollPosition() 
	{
		if (!this.isVertical) return;
		var x = {}, y = {};
		var scrollBoxObject = this.scrollBoxObject;
		if (!scrollBoxObject) return;
		scrollBoxObject.getPosition(x, y);
		this.lastScrollX = x.value;
		this.lastScrollY = y.value;
	},
  
	onTabAdded : function TSTBrowser_onTabAdded(aEvent, aTab) 
	{
		var tab = aTab || aEvent.originalTarget;
		var b   = this.mTabBrowser;

		if (this.isTabInitialized(tab))
			return false;

		this.initTab(tab);

		var hasStructure = this.treeStructure && this.treeStructure.length;
		var pareintIndexInTree = hasStructure ? this.treeStructure.shift() : 0 ;

		if (this.readiedToAttachNewTab) {
			if (pareintIndexInTree < 0) { // there is no parent, so this is a new parent!
				this.parentTab = tab.getAttribute(this.kID);
			}

			let parent = this.getTabById(this.parentTab);
			if (parent) {
				let tabs = [parent].concat(this.getDescendantTabs(parent));
				parent = pareintIndexInTree < tabs.length ? tabs[pareintIndexInTree] : parent ;
			}
			if (parent) {
				this.attachTabTo(tab, parent);
			}

			let refTab;
			let newIndex = -1;
			if (hasStructure) {
			}
			else if (this.insertBefore &&
				(refTab = this.getTabById(this.insertBefore))) {
				newIndex = refTab._tPos;
			}
			else if (parent &&
				this.getTreePref('insertNewChildAt') == this.kINSERT_FISRT &&
				this.multipleCount == 0) {
				/* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̎q<EFBFBD>^<EFBFBD>u<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>C<EFBFBD>ɊJ<EFBFBD><EFBFBD><EFBFBD>ꍇ<EFBFBD>A<EFBFBD>ŏ<EFBFBD><EFBFBD>ɊJ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>^<EFBFBD>u<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
				   <EFBFBD>q<EFBFBD>^<EFBFBD>u<EFBFBD>̍ŏ<EFBFBD><EFBFBD>̈ʒu<EFBFBD>ɑ}<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>A<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>^<EFBFBD>u<EFBFBD>́u<EFBFBD>ŏ<EFBFBD><EFBFBD>̊J<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>^<EFBFBD>u<EFBFBD>v<EFBFBD><EFBFBD>
				   <EFBFBD>u<EFBFBD><EFBFBD><EFBFBD>X<EFBFBD>ŏ<EFBFBD><EFBFBD>̎q<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>^<EFBFBD>u<EFBFBD>v<EFBFBD>Ƃ̊Ԃɑ}<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ă<EFBFBD><EFBFBD><EFBFBD> */
				newIndex = parent._tPos + 1;
				if (refTab = this.getFirstChildTab(parent))
					this.insertBefore = refTab.getAttribute(this.kID);
			}

			if (newIndex > -1) {
				if (newIndex > tab._tPos) newIndex--;
				this.internallyTabMovingCount++;
				b.moveTabTo(tab, newIndex);
				this.internallyTabMovingCount--;
			}
		}

		if (!this.readiedToAttachMultiple) {
			this.stopToOpenChildTab(b);
		}
		else {
			this.multipleCount++;
		}

		if (this.animationEnabled) {
			this.updateTabCollapsed(tab, true, true);
			this.updateTabCollapsed(tab, false, this.restoringWindow);
		}

		if (this.readiedToOpenDivertedTab) {
			if (!this.getPref('browser.tabs.loadDivertedInBackground'))
				b.selectedTab = tab;
			this.readiedToOpenDivertedTab = false;
		}

		var prev = this.getPreviousSiblingTab(tab);
		if (prev) {
			this.setTabValue(tab, this.kINSERT_AFTER, prev.getAttribute(this.kID));
			this.setTabValue(prev, this.kINSERT_BEFORE, tab.getAttribute(this.kID));
		}

		var next = this.getNextSiblingTab(tab);
		if (next) {
			this.setTabValue(tab, this.kINSERT_BEFORE, next.getAttribute(this.kID));
			this.setTabValue(next, this.kINSERT_AFTER, tab.getAttribute(this.kID));
		}

		if (!TreeStyleTabService.restoringWindow &&
			!this.useTMPSessionAPI &&
			!this._checkRestoringWindowTimerOnTabAdded) {
			this._checkRestoringWindowTimerOnTabAdded = window.setTimeout(function(aSelf) {
				aSelf._checkRestoringWindowTimerOnTabAdded = null;
				if (aSelf.getRestoringTabsCount() > 1)
					TreeStyleTabService.restoringWindow = true;
			}, 0, this);
		}

		return true;
	},
	_checkRestoringWindowTimerOnTabAdded : null,
 
	onTabRemoved : function TSTBrowser_onTabRemoved(aEvent) 
	{
		var tab = aEvent.originalTarget;
		var b   = this.mTabBrowser;

		this.stopTabIndentAnimation(tab);
		this.stopTabCollapseAnimation(tab);
		this.destroyTab(tab);

		var closeParentBehavior = this.getTreePref('closeParentBehavior');
		var closeRootBehavior = this.getTreePref('closeRootBehavior');

		var collapsed = this.isCollapsed(tab);
		if (collapsed)
				this.stopRendering();

		var subtreeCollapsed = this.isSubtreeCollapsed(tab);
		if (
			closeParentBehavior == this.CLOSE_PARENT_BEHAVIOR_CLOSE ||
			subtreeCollapsed
			) {
			if (subtreeCollapsed)
				this.stopRendering();

			let tabs = this.getDescendantTabs(tab);

			let id = this.makeNewClosedSetId();
			id += '::' + (tabs.length+1);

			this.setTabValue(tab, this.kCLOSED_SET_ID, id);

			tabs.reverse().forEach(function(aTab) {
				this.setTabValue(aTab, this.kCLOSED_SET_ID, id);
				b.removeTab(aTab);
			}, this);

			// for last tab closing, we have to open new tab manually if running on Firefox 3.0.
			if (
				!('_beginRemoveTab' in b) && !('_endRemoveTab' in b) && // Firefox 3.0.x
				this.getTabs(b).snapshotLength == 1 // last tab
				) {
				b.addTab('about:blank');
			}

			if (subtreeCollapsed)
				this.startRendering();
		}

		var firstChild     = this.getFirstChildTab(tab);
		var parentTab      = this.getParentTab(tab);
		var nextFocusedTab = null;

		var prev = this.getPreviousSiblingTab(tab);
		var next = this.getNextSiblingTab(tab);
		if (prev) {
			this.setTabValue(tab, this.kINSERT_AFTER, prev.getAttribute(this.kID));

			if (next)
				this.setTabValue(prev, this.kINSERT_BEFORE, next.getAttribute(this.kID));
			else
				this.deleteTabValue(prev, this.kINSERT_BEFORE);
		}
		if (next) {
			this.setTabValue(tab, this.kINSERT_BEFORE, next.getAttribute(this.kID));

			if (prev)
				this.setTabValue(next, this.kINSERT_AFTER, prev.getAttribute(this.kID));
			else
				this.deleteTabValue(next, this.kINSERT_AFTER);
		}

		var backupAttributes = {};
		var indentModifiedTabs = [];

		if (firstChild) {
			backupAttributes[this.kCHILDREN] = this.getTabValue(tab, this.kCHILDREN);
			let children   = this.getChildTabs(tab);
			children.forEach((
				(closeParentBehavior == this.CLOSE_PARENT_BEHAVIOR_DETACH) ?
					function(aTab) {
						indentModifiedTabs.push(aTab);
						this.partTab(aTab, {
							dontUpdateIndent : true
						});
						this.moveTabSubtreeTo(aTab, this.getLastTab(b)._tPos);
					} :
				(parentTab ?
					(
						closeParentBehavior == this.CLOSE_PARENT_BEHAVIOR_PROMOTE_FIRST &&
						this.getChildTabs(parentTab).length > 1
					) :
					closeRootBehavior == this.CLOSE_ROOT_BEHAVIOR_PROMOTE_FIRST
				) ?
					function(aTab, aIndex) {
						this.partTab(aTab, { dontUpdateIndent : true });
						if (aIndex == 0) {
							nextFocusedTab = aTab;
							indentModifiedTabs.push(aTab);
							if (parentTab) {
								this.attachTabTo(aTab, parentTab, {
									dontUpdateIndent : true,
									dontExpand       : true,
									dontMove         : true
								});
							}
							this.collapseExpandSubtree(aTab, false);
							this.deleteTabValue(aTab, this.kSUBTREE_COLLAPSED);
						}
						else {
							this.attachTabTo(aTab, children[0], {
								dontUpdateIndent : true,
								dontExpand       : true,
								dontMove         : true
							});
						}
					} :
				parentTab ?
					function(aTab) {
						indentModifiedTabs.push(aTab);
						this.attachTabTo(aTab, parentTab, {
							dontUpdateIndent : true,
							dontExpand       : true,
							dontMove         : true
						});
					} :
					function(aTab) {
						indentModifiedTabs.push(aTab);
						this.partTab(aTab, { dontUpdateIndent : true });
					}
			), this);
			if (closeParentBehavior == this.CLOSE_PARENT_BEHAVIOR_PROMOTE_ALL ||
				closeParentBehavior == this.CLOSE_PARENT_BEHAVIOR_PROMOTE_FIRST)
				nextFocusedTab = firstChild;
		}

		if (parentTab) {
			let firstSibling = this.getFirstChildTab(parentTab);
			let lastSibling  = this.getLastChildTab(parentTab);
			if (tab == lastSibling && !nextFocusedTab) {
				if (tab == firstSibling) { // there is only one child
					nextFocusedTab = parentTab;
				}
				else { // previous sibling tab
					nextFocusedTab = this.getPreviousSiblingTab(tab);
				}
			}

			let ancestors = [],
				ancestor = parentTab;
			do {
				ancestors.push(ancestor.getAttribute(this.kID));
				if (!next && (next = this.getNextSiblingTab(ancestor)))
					backupAttributes[this.kINSERT_BEFORE] = next.getAttribute(this.kID);
			}
			while (ancestor = this.getParentTab(ancestor));
			backupAttributes[this.kANCESTOR] = ancestors.join('|');

			let shouldCloseParentTab = (
					this.isGroupTab(parentTab) &&
					this.getDescendantTabs(parentTab).length == 1
				);
			if (shouldCloseParentTab && nextFocusedTab == parentTab)
				nextFocusedTab = this.getNextFocusedTab(parentTab);

			this.partTab(tab, { dontUpdateIndent : true });

			if (shouldCloseParentTab) {
				window.setTimeout(function() {
					if (parentTab.parentNode)
						b.removeTab(parentTab);
					parentTab = null;
					b = null;
				}, 0);
			}
		}
		else if (!nextFocusedTab) {
			nextFocusedTab = this.getNextFocusedTab(tab);
		}

		if (indentModifiedTabs.length)
			this.updateTabsIndentWithDelay(indentModifiedTabs);
		this.checkTabsIndentOverflow();

		for (var i in backupAttributes)
		{
			this.setTabValue(tab, i, backupAttributes[i]);
		}

		if (b.selectedTab == tab) {
			this._focusChangedByCurrentTabRemove = true;
			if (
				nextFocusedTab &&
				this._tabFocusAllowance.every(function(aFunc) {
					try {
						return aFunc.call(this, b);
					}
					catch(e) {
						return false;
					}
				}, this)
				)
				b.selectedTab = nextFocusedTab;
		}

		if (collapsed)
			this.startRendering();
	},
	CLOSE_PARENT_BEHAVIOR_PROMOTE_FIRST : 3,
	CLOSE_PARENT_BEHAVIOR_PROMOTE_ALL   : 0,
	CLOSE_PARENT_BEHAVIOR_DETACH        : 1,
	CLOSE_PARENT_BEHAVIOR_CLOSE         : 2,
	CLOSE_ROOT_BEHAVIOR_PROMOTE_FIRST   : 3,
	CLOSE_ROOT_BEHAVIOR_DETACH          : 1,
	getNextFocusedTab : function TSTBrowser_getNextFocusedTab(aTab)
	{
		return this.getNextSiblingTab(aTab) ||
				this.getPreviousVisibleTab(aTab);
	},
 
	onTabMove : function TSTBrowser_onTabMove(aEvent) 
	{
		var tab = aEvent.originalTarget;
		var b   = this.mTabBrowser;

		// When the tab was moved before TabOpen event is fired, we have to update manually.
		var newlyOpened = !this.isTabInitialized(tab) && this.onTabAdded(null, tab);

		// twisty vanished after the tab is moved!!
		this.initTabContents(tab);

		if (this.hasChildTabs(tab) && !this.subTreeMovingCount) {
			this.moveTabSubtreeTo(tab, tab._tPos);
		}

		var parentTab = this.getParentTab(tab);
		if (parentTab && !this.subTreeChildrenMovingCount) {
			this.updateChildrenArray(parentTab);
		}

		this.updateTabsCount(tab, true);

		var prev = this.getPreviousSiblingTab(tab);
		var next = this.getNextSiblingTab(tab);

		if (prev) {
			this.setTabValue(prev, this.kINSERT_BEFORE, tab.getAttribute(this.kID));
			this.setTabValue(tab, this.kINSERT_AFTER, prev.getAttribute(this.kID));
		}
		else
			this.deleteTabValue(tab, this.kINSERT_AFTER);

		if (next) {
			this.setTabValue(next, this.kINSERT_AFTER, tab.getAttribute(this.kID));
			this.setTabValue(tab, this.kINSERT_BEFORE, next.getAttribute(this.kID));
		}
		else
			this.deleteTabValue(tab, this.kINSERT_BEFORE);

		var old = aEvent.detail;
		if (old > tab._tPos) old--;
		old = this.getTabs(b).snapshotItem(old);

		prev = this.getPreviousSiblingTab(old);
		next = this.getNextSiblingTab(old);

		if (prev) {
			this.setTabValue(prev, this.kINSERT_BEFORE, old.getAttribute(this.kID));
			this.setTabValue(old, this.kINSERT_AFTER, prev.getAttribute(this.kID));
		}
		else
			this.deleteTabValue(old, this.kINSERT_AFTER);

		if (next) {
			this.setTabValue(next, this.kINSERT_AFTER, old.getAttribute(this.kID));
			this.setTabValue(old, this.kINSERT_BEFORE, next.getAttribute(this.kID));
		}
		else
			this.deleteTabValue(old, this.kINSERT_BEFORE);

		if (
			this.subTreeMovingCount ||
			this.internallyTabMovingCount ||
			// We don't have to fixup tree structure for a NEW TAB
			// which has already been structured.
			(newlyOpened && this.getParentTab(tab))
			)
			return;

		this.attachTabFromPosition(tab, aEvent.detail);
	},
	
	attachTabFromPosition : function TSTBrowser_attachTabFromPosition(aTab, aOldPosition) 
	{
		var parent = this.getParentTab(aTab);

		if (aOldPosition === void(0)) aOldPosition = aTab._tPos;

		var pos = this.getChildIndex(aTab, parent);
		var oldPos = this.getChildIndex(this.getTabs(this.mTabBrowser).snapshotItem(aOldPosition), parent);
		var delta;
		if (pos == oldPos) { // no move?
			return;
		}
		else if (pos < 0 || oldPos < 0) {
			delta = 2;
		}
		else {
			delta = Math.abs(pos - oldPos);
		}

		var prevTab = this.getPreviousTab(aTab);
		var nextTab = this.getNextTab(aTab);

		var tabs = this.getDescendantTabs(aTab);
		if (tabs.length) {
			nextTab = this.getNextTab(tabs[tabs.length-1]);
		}

		var prevParent = this.getParentTab(prevTab);
		var nextParent = this.getParentTab(nextTab);

		var prevLevel  = prevTab ? Number(prevTab.getAttribute(this.kNEST)) : -1 ;
		var nextLevel  = nextTab ? Number(nextTab.getAttribute(this.kNEST)) : -1 ;

		var newParent;

		if (!prevTab) { // moved to topmost position
			newParent = null;
		}
		else if (!nextTab) { // moved to last position
			newParent = (delta > 1) ? prevParent : parent ;
		}
		else if (prevParent == nextParent) { // moved into existing tree
			newParent = prevParent;
		}
		else if (prevLevel > nextLevel) { // moved to end of existing tree
			if (this.mTabBrowser.selectedTab != aTab) { // maybe newly opened tab
				newParent = prevParent;
			}
			else { // maybe drag and drop
				var realDelta = Math.abs(aTab._tPos - aOldPosition);
				newParent = realDelta < 2 ? prevParent : (parent || nextParent) ;
			}
		}
		else if (prevLevel < nextLevel) { // moved to first child position of existing tree
			newParent = parent || nextParent;
		}

		if (newParent != parent) {
			if (newParent)
				this.attachTabTo(aTab, newParent, { insertBefore : nextTab });
			else
				this.partTab(aTab);
		}
	},
 
	updateChildrenArray : function TSTBrowser_updateChildrenArray(aTab) 
	{
		var children = this.getChildTabs(aTab);
		children.sort(this.sortTabsByOrder);
		this.setTabValue(
			aTab,
			this.kCHILDREN,
			children
				.map(function(aItem) {
					return aItem.getAttribute(this.kID);
				}, this)
				.join('|')
		);
	},
  
	onTabRestoring : function TSTBrowser_onTabRestoring(aEvent) 
	{
		this.restoreStructure(aEvent.originalTarget);
	},
	
	restoreStructure : function TSTBrowser_restoreStructure(aTab) 
	{
		/*
			<EFBFBD>E<EFBFBD>B<EFBFBD><EFBFBD><EFBFBD>h<EFBFBD>E<EFBFBD>̕<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ł͈ȉ<EFBFBD><EFBFBD>̏<EFBFBD><EFBFBD>ɏ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>B

				nsSessionStore::restoreWindow()
				nsSessionStore::restoreHistoryPrecursor()
				<<EFBFBD>^<EFBFBD>u<EFBFBD>̕<EFBFBD><EFBFBD><EFBFBD><EFBFBD>J<EFBFBD>n>
				nsSessionStore::restoreHistory() // <20><><EFBFBD>݂̃^<5E>u<EFBFBD>̕<EFBFBD><CC95><EFBFBD>
				(SSTabRestoring DOMEvent fired)
				(sessionstore-windows-restored nsIObserver notification)
				nsSessionStore::restoreHistory() // 0<>Ԗڂ̃^<5E>u<EFBFBD>̕<EFBFBD><CC95><EFBFBD>
				(SSTabRestoring DOMEvent fired)
				...
				nsSessionStore::restoreHistory() // <20>Ō<EFBFBD><C58C>̃^<5E>u<EFBFBD>̕<EFBFBD><CC95><EFBFBD>
				(SSTabRestoring DOMEvent fired)
				<<EFBFBD>^<EFBFBD>u<EFBFBD>̕<EFBFBD><EFBFBD><EFBFBD><EFBFBD>I<EFBFBD><EFBFBD>>
				nsSessionStore::restoreDocument_proxy() // <20>ŏ<EFBFBD><C58F>̃^<5E>u<EFBFBD>̕<EFBFBD><CC95><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
				(SSTabRestored DOMEvent fired)
				...
				nsSessionStore::restoreDocument_proxy() // <20>Ō<EFBFBD><C58C>̃^<5E>u<EFBFBD>̕<EFBFBD><CC95><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
				(SSTabRestored DOMEvent fired)
				<<EFBFBD>^<EFBFBD>u<EFBFBD>̕<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>>

			<EFBFBD><EFBFBD><EFBFBD>̎<EFBFBD><EFBFBD>AnsSessionStore::restoreHistoryPrecursor() <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
			nsSessionStore::restoreHistory() <EFBFBD><EFBFBD><EFBFBD>Ă΂<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>O<EFBFBD>ɁA
			<EFBFBD><EFBFBD><EFBFBD>ꂩ<EFBFBD>畜<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>邷<EFBFBD>ׂẴ^<EFBFBD>u<EFBFBD>ɂ‚<EFBFBD><EFBFBD><EFBFBD>
			tab.linkedBrowser.parentNode.__SS_data._tabStillLoading
			<EFBFBD><EFBFBD>true<EFBFBD>ɃZ<EFBFBD>b<EFBFBD>g<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>B
			<EFBFBD><EFBFBD><EFBFBD>̃^<EFBFBD>u<EFBFBD>̓ǂݍ<EFBFBD><EFBFBD>݂<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>A
			tab.linkedBrowser.parentNode.__SS_data
			<EFBFBD><EFBFBD>delete<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>B

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			<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>āArestoringWindow <EFBFBD><EFBFBD> true <EFBFBD>ɐݒ肷<EFBFBD><EFBFBD><EFBFBD>B

			restoringWindow <EFBFBD><EFBFBD> true <EFBFBD>ł<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ꍇ<EFBFBD>́ASSTabRestored <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>s<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>x<EFBFBD><EFBFBD>
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			restoringWindow <EFBFBD><EFBFBD> false <EFBFBD>ɂ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>B

			restoringWindow <EFBFBD>́A<EFBFBD><EFBFBD><EFBFBD><EFBFBD> sessionstore-windows-restored <EFBFBD><EFBFBD><EFBFBD>ʒm<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
			<EFBFBD>܂ł<EFBFBD> true <EFBFBD>ɂȂ邱<EFBFBD>Ƃ͂Ȃ<EFBFBD><EFBFBD>B<EFBFBD><EFBFBD><EFBFBD>̂<EFBFBD><EFBFBD>߁A<EFBFBD>蓮<EFBFBD>ŘA<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ă^<EFBFBD>u<EFBFBD>𕡐<EFBFBD>
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			<EFBFBD>S<EFBFBD>z<EFBFBD>͂Ȃ<EFBFBD><EFBFBD>B
		*/
		var restoringMultipleTabs = TreeStyleTabService.restoringWindow;

		var tab = aTab;
		var b   = this.mTabBrowser;
		var id  = this.getTabValue(tab, this.kID);
		var mayBeDuplicated = false;

		tab.setAttribute(this.kID_RESTORING, id);
		if (this.isTabDuplicated(tab)) {
			mayBeDuplicated = true;
			id = this.redirectId(id);
		}
		tab.removeAttribute(this.kID_RESTORING);

		var children = this.getTabValue(tab, this.kCHILDREN);
		if (!mayBeDuplicated || tab.hasAttribute(this.kCHILDREN)) {
			// for safety
			this.partAllChildren(tab, {
				dontUpdateIndent : true,
				dontAnimate      : restoringMultipleTabs
			});
		}

		var closeSetId = null;
		if (!mayBeDuplicated) {
			closeSetId = this.getTabValue(tab, this.kCLOSED_SET_ID);
			/* If it has a parent, it is wrongly attacched by tab moving
			   on restoring. Restoring the old ID (the next statement)
			   breaks the children list of the temporary parent and causes
			   many problems. So, to prevent these problems, I part the tab
			   from the temporary parent manually. */
			this.resetTab(tab, false);
		}
		this.deleteTabValue(tab, this.kCLOSED_SET_ID);

		this.setTabValue(tab, this.kID, id);

		if (closeSetId)
			this.restoreClosedSet(closeSetId, tab);

		var isSubtreeCollapsed = restoringMultipleTabs && (this.getTabValue(tab, this.kSUBTREE_COLLAPSED) == 'true');
		this.setTabValue(tab, this.kSUBTREE_COLLAPSED, isSubtreeCollapsed);

		var tabs = [];
		if (children) {
			tab.removeAttribute(this.kCHILDREN);
			children = children.split('|');
			if (mayBeDuplicated)
				children = children.map(function(aChild) {
					return this.redirectId(aChild);
				}, this);
			children.forEach(function(aTab) {
				if (aTab && (aTab = this.getTabById(aTab))) {
					this.attachTabTo(aTab, tab, {
						dontExpand       : restoringMultipleTabs,
						dontUpdateIndent : true,
						dontAnimate      : restoringMultipleTabs
					});
					tabs.push(aTab);
				}
			}, this);
			children = children.join('|');
			if (tab.getAttribute(this.kCHILDREN) == children)
				tab.removeAttribute(this.kCHILDREN_RESTORING);
			else
				tab.setAttribute(this.kCHILDREN_RESTORING, children);
		}

		var nextTab = this.getTabValue(tab, this.kINSERT_BEFORE);
		if (nextTab && mayBeDuplicated) nextTab = this.redirectId(nextTab);
		nextTab = this.getTabById(nextTab);

		if (!nextTab) {
			let prevTab = this.getTabValue(tab, this.kINSERT_AFTER);
			if (prevTab && mayBeDuplicated) prevTab = this.redirectId(prevTab);
			prevTab = this.getTabById(prevTab);
			nextTab = this.getNextSiblingTab(prevTab);
		}

		var ancestors = (this.getTabValue(tab, this.kANCESTOR) || this.getTabValue(tab, this.kPARENT)).split('|');
		var parent = null;
		for (var i in ancestors)
		{
			if (mayBeDuplicated) ancestors[i] = this.redirectId(ancestors[i]);
			parent = this.getTabById(ancestors[i]);
			if (parent) {
				parent = ancestors[i];
				break;
			}
		}
		this.deleteTabValue(tab, this.kANCESTOR);

		if (parent) {
			tab.removeAttribute(this.kPARENT);
			parent = this.getTabById(parent);
			if (parent) {
				this.attachTabTo(tab, parent, {
					dontExpand       : restoringMultipleTabs,
					insertBefore     : nextTab,
					dontUpdateIndent : true,
					dontAnimate      : restoringMultipleTabs
				});
				this.updateTabsIndent([tab], undefined, undefined, restoringMultipleTabs);
				this.checkTabsIndentOverflow();

				if (parent.getAttribute(this.kCHILDREN_RESTORING))
					this.correctChildTabsOrderWithDelay(parent);
			}
			else {
				this.deleteTabValue(tab, this.kPARENT);
			}
		}
		else if (children) {
			this.updateTabsIndent(tabs, undefined, undefined, restoringMultipleTabs);
			this.checkTabsIndentOverflow();
		}

		if (!parent) {
			if (!nextTab) nextTab = this.getNextTab(tab);
			let parentOfNext = this.getParentTab(nextTab);
			let newPos = -1;
			if (parentOfNext) {
				let descendants = this.getDescendantTabs(parentOfNext);
				newPos = descendants[descendants.length-1]._tPos;
			}
			else if (nextTab) {
				newPos = nextTab._tPos;
				if (newPos > tab._tPos) newPos--;
			}
			if (newPos > -1)
				b.moveTabTo(tab, newPos);
		}

		if (isSubtreeCollapsed)
			this.collapseExpandSubtree(tab, isSubtreeCollapsed, restoringMultipleTabs);

		if (mayBeDuplicated)
			this.clearRedirectionTable();
	},
 
	correctChildTabsOrderWithDelay : function TSTBrowser_correctChildTabsOrderWithDelay(aTab) 
	{
		if (aTab.correctChildTabsOrderWithDelayTimer)
			window.clearTimeout(aTab.correctChildTabsOrderWithDelayTimer);

		aTab.correctChildTabsOrderWithDelayTimer = window.setTimeout(function(aSelf) {
			aSelf.correctChildTabsOrder(aTab);
		}, 10, this);
	},
 
	correctChildTabsOrder : function TSTBrowser_correctChildTabsOrder(aTab) 
	{
		var restoringChildren = aTab.getAttribute(this.kCHILDREN_RESTORING);
		if (!restoringChildren) return;

		var children = aTab.getAttribute(this.kCHILDREN);
		if (restoringChildren != children) {
			var restoringChildrenIDs = restoringChildren.split('|');
			restoringChildrenIDs.reverse().forEach(function(aChild, aIndex) {
				aChild = this.getTabById(aChild);
				if (!aChild) return;

				let nextTab = aIndex > 0 ?
							this.getTabById(restoringChildrenIDs[aIndex-1]) :
							this.getNextSiblingTab(aTab) ;
				if (nextTab == this.getNextSiblingTab(aChild)) return;

				let newPos = -1;
				if (nextTab) {
					newPos = nextTab._tPos;
					if (newPos > aChild._tPos) newPos--;
				}
				if (newPos > -1)
					this.moveTabSubtreeTo(aChild, newPos);
			}, this);
			children = aTab.getAttribute(this.kCHILDREN);
		}

		if (restoringChildren == children)
			aTab.removeAttribute(this.kCHILDREN_RESTORING);

		aTab.correctChildTabsOrderWithDelayTimer = null;
	},
 
	redirectId : function TSTBrowser_redirectId(aId) 
	{
		if (!(aId in this._redirectionTable))
			this._redirectionTable[aId] = this.makeNewId();
		return this._redirectionTable[aId];
	},
	_redirectionTable : {},
 
	clearRedirectionTable : function TSTBrowser_clearRedirectionTable() 
	{
		if (this._clearRedirectionTableTimer) {
			window.clearTimeout(this._clearRedirectionTableTimer);
			this._clearRedirectionTableTimer = null;
		}
		this._clearRedirectionTableTimer = window.setTimeout(function(aSelf) {
			aSelf._redirectionTable = {};
		}, 1000, this);
	},
	_clearRedirectionTableTimer : null,
 
	restoreClosedSet : function(aId, aRestoredTab)
	{
		if (
			this.useTMPSessionAPI ||
			this._restoringClosedSet ||
			!this.getTreePref('undoCloseTabSubtree')
			)
			return;

		var items = this.evalInSandbox('('+this.SessionStore.getClosedTabData(window)+')');
		var indexes = [];
		items.forEach(function(aItem, aIndex) {
			if (aItem.state.extData &&
				aItem.state.extData[this.kCLOSED_SET_ID] &&
				aItem.state.extData[this.kCLOSED_SET_ID] == aId)
				indexes.push(aIndex);
		}, this);

		var count = aId.split('::')[1];

		if (
			!indexes.length ||
			(
				indexes.length+1 < count &&
				this.getTreePref('undoCloseTabSubtree.onlyFullSet')
			)
			)
			return;

		this._restoringClosedSet = true;
		this.stopRendering();

		TreeStyleTabService.restoringWindow = true;

		var offset = 0;
		indexes.forEach(function(aIndex) {
			undoCloseTab(aIndex - (offset++));
		});

		if (aRestoredTab) {
			window.setTimeout(function(aSelf) {
				aSelf.mTabBrowser.selectedTab = aRestoredTab;
			}, 0, this);
		}

		this.startRendering();
		this._restoringClosedSet = false;
	},
	_restoringClosedSet : false,
  
	onTabRestored : function TSTBrowser_onTabRestored(aEvent) 
	{
		// update the status for the next restoring
		if (!this.useTMPSessionAPI && TreeStyleTabService.restoringWindow)
			TreeStyleTabService.restoringWindow = TreeStyleTabService.getRestoringTabsCount() > 0;
	},
 
	onTabSelect : function TSTBrowser_onTabSelect(aEvent) 
	{
		var b   = this.mTabBrowser;
		var tab = b.selectedTab

		if (this.isCollapsed(tab)) {
			if (this.getTreePref('autoExpandSubtreeOnCollapsedChildFocused')) {
				var parentTab = tab;
				while (parentTab = this.getParentTab(parentTab))
				{
					this.collapseExpandSubtree(parentTab, false);
				}
				this.collapseExpandTreesIntelligentlyWithDelayFor(tab);
			}
			else {
				b.selectedTab = this.getRootTab(tab);
			}
		}
		else if (
				this.getTreePref('autoCollapseExpandSubtreeOnSelect') &&
				(
					!this._focusChangedByCurrentTabRemove ||
					this.getTreePref('autoCollapseExpandSubtreeOnSelect.onCurrentTabRemove')
				)
				) {
			if (!this.hasChildTabs(tab) || !this.isSubtreeCollapsed(tab))
				tab = null;

			if (
				this._focusChangedByShortcut &&
				this.accelKeyPressed &&
				!this.getTreePref('autoCollapseExpandSubtreeOnSelect.whileFocusMovingByShortcut')
				) {
				TreeStyleTabService.expandTreeAfterKeyReleased(tab);
			}
			else {
				this.collapseExpandTreesIntelligentlyWithDelayFor(tab);
			}
		}

		this._focusChangedByCurrentTabRemove = false;
		this._focusChangedByShortcut = false;

		this.updateInvertedTabContentsOrder();
	},
 
	onTabClick : function TSTBrowser_onTabClick(aEvent) 
	{
		if (aEvent.button == 1) {
			let tab = this.getTabFromEvent(aEvent);
			if (tab && !this.warnAboutClosingTabSubtreeOf(tab)) {
				aEvent.preventDefault();
				aEvent.stopPropagation();
			}
			return;
		}

		if (aEvent.button != 0)
			return;

		if (this.isEventFiredOnTwisty(aEvent)) {
			let tab = this.getTabFromEvent(aEvent);
			if (this.hasChildTabs(tab) && this.canCollapseSubtree()) {
				this.collapseExpandSubtree(tab, tab.getAttribute(this.kSUBTREE_COLLAPSED) != 'true');
				aEvent.preventDefault();
				aEvent.stopPropagation();
			}
			return;
		}

		if (this.isEventFiredOnClosebox(aEvent)) {
			let tab = this.getTabFromEvent(aEvent);
			if (!this.warnAboutClosingTabSubtreeOf(tab)) {
				aEvent.preventDefault();
				aEvent.stopPropagation();
			}
			return;
		}

		// click on indented space on the tab bar
		if (!this.getTabFromEvent(aEvent)) {
			let tab = this.getTabFromTabbarEvent(aEvent);
			if (tab) this.mTabBrowser.selectedTab = tab;
			return;
		}
	},
	getTabFromTabbarEvent : function TSTBrowser_getTabFromTabbarEvent(aEvent)
	{
		if (
			!this.shouldDetectClickOnIndentSpaces ||
			this.isEventFiredOnClickable(aEvent)
			)
			return null;

		var tab = null;
		var clickedPoint = aEvent[this.positionProp];
		this.getTabsArray(this.mTabBrowser).some(function(aTab) {
			var box = aTab.boxObject;
			if (box[this.positionProp] > clickedPoint ||
				box[this.positionProp] + box[this.sizeProp] < clickedPoint) {
				return false;
			}
			tab = aTab;
			return true;
		}, this);
		return tab;
	},
 
	onDblClick : function TSTBrowser_onDblClick(aEvent) 
	{
		var tab = this.getTabFromEvent(aEvent);
		if (tab &&
			this.hasChildTabs(tab) &&
			this.getTreePref('collapseExpandSubtree.dblclick')) {
			this.collapseExpandSubtree(tab, tab.getAttribute(this.kSUBTREE_COLLAPSED) != 'true');
			aEvent.preventDefault();
			aEvent.stopPropagation();
		}
	},
 
	onMouseDown : function TSTBrowser_onMouseDown(aEvent) 
	{
		if (aEvent.button != 0 ||
			!this.isEventFiredOnTwisty(aEvent))
			return;

		this.getTabFromEvent(aEvent).__treestyletab__preventSelect = true;
	},
 
	onScroll : function TSTBrowser_onScroll(aEvent) 
	{
		if (this.lastScrollX < 0 || this.lastScrollY < 0) return;
		var x = {}, y = {};
		var scrollBoxObject = this.scrollBoxObject;
		scrollBoxObject.getPosition(x, y);
		if (x.value != this.lastScrollX || y.value != this.lastScrollY)
			scrollBoxObject.scrollTo(this.lastScrollX, this.lastScrollY);
		this.lastScrollX = -1;
		this.lastScrollY = -1;
	},
 
	onTabbarOverflow : function TSTBrowser_onTabbarOverflow(aEvent) 
	{
		var tabs = this.mTabBrowser.mTabContainer;
		var horizontal = tabs.orient == 'horizontal';
		if (horizontal) return;
		aEvent.stopPropagation();
		if (aEvent.detail == 1) return;
		if (aEvent.type == 'overflow') {
			tabs.setAttribute('overflow', 'true');
			this.scrollBoxObject.ensureElementIsVisible(tabs.selectedItem);
		}
		else {
			tabs.removeAttribute('overflow');
		}
	},
 
	onPopupShowing : function TSTBrowser_onPopupShowing(aEvent) 
	{
		if (aEvent.target != aEvent.currentTarget) return;
		switch (aEvent.target.getAttribute('anonid'))
		{
			case 'tabContextMenu':
				this.initTabContextMenu(aEvent);
				break;
			case 'alltabs-popup':
				this.initAllTabsPopup(aEvent);
				break;
		}
	},
	
	initTabContextMenu : function TSTBrowser_initTabContextMenu(aEvent) 
	{
		var b = this.mTabBrowser;
		var sep, items = {};

		[
			this.kMENUITEM_RELOADSUBTREE,
			this.kMENUITEM_RELOADCHILDREN,
			this.kMENUITEM_REMOVESUBTREE,
			this.kMENUITEM_REMOVECHILDREN,
			this.kMENUITEM_COLLAPSE,
			this.kMENUITEM_EXPAND,
			this.kMENUITEM_AUTOHIDE,
			this.kMENUITEM_FIXED,
			this.kMENUITEM_BOOKMARKSUBTREE
		].forEach(function(aID) {
			let item = this.evaluateXPath(
				'descendant::xul:*[starts-with(@id, "'+aID+'")]',
				aEvent.currentTarget,
				XPathResult.FIRST_ORDERED_NODE_TYPE
			).singleNodeValue;
			items[aID] = item;
			if (this.getTreePref('show.'+aID))
				item.removeAttribute('hidden');
			else
				item.setAttribute('hidden', true);
			switch (aID)
			{
				case this.kMENUITEM_RELOADSUBTREE:
				case this.kMENUITEM_RELOADCHILDREN:
				case this.kMENUITEM_REMOVESUBTREE:
				case this.kMENUITEM_REMOVECHILDREN:
				case this.kMENUITEM_COLLAPSE:
				case this.kMENUITEM_EXPAND:
				case this.kMENUITEM_BOOKMARKSUBTREE:
					this.showHideSubtreeMenuItem(item, [b.mContextTab]);
					break;
				default:
					break;
			}
		}, this);

		// collapse/expand all
		sep = this.evaluateXPath(
			'descendant::xul:menuseparator[starts-with(@id, "'+this.kMENUITEM_COLLAPSEEXPAND_SEPARATOR+'")]',
			aEvent.currentTarget,
			XPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
		let collapseItem = items[this.kMENUITEM_COLLAPSE];
		let expanndItem = items[this.kMENUITEM_EXPAND];
		if (this.canCollapseSubtree(b) &&
			this.evaluateXPath(
				'child::xul:tab[@'+this.kCHILDREN+']',
				b.mTabContainer
			).snapshotLength) {
			if (this.evaluateXPath(
					'child::xul:tab[@'+this.kCHILDREN+' and not(@'+this.kSUBTREE_COLLAPSED+'="true")]',
					b.mTabContainer
				).snapshotLength)
				collapseItem.removeAttribute('disabled');
			else
				collapseItem.setAttribute('disabled', true);

			if (this.evaluateXPath(
					'child::xul:tab[@'+this.kCHILDREN+' and @'+this.kSUBTREE_COLLAPSED+'="true"]',
					b.mTabContainer
				).snapshotLength)
				expanndItem.removeAttribute('disabled');
			else
				expanndItem.setAttribute('disabled', true);
		}
		else {
			collapseItem.setAttribute('hidden', true);
			expanndItem.setAttribute('hidden', true);
		}
		if (collapseItem.getAttribute('hidden') == 'true' &&
			expanndItem.getAttribute('hidden') == 'true') {
			sep.setAttribute('hidden', true);
		}
		else {
			sep.removeAttribute('hidden');
		}

		// auto hide
		let autohide = items[this.kMENUITEM_AUTOHIDE];
		this.autoHide.updateMenuItem(autohide);

		// fix
		let fixedPref;
		let fixedLabel;
		if (this.isVertical) {
			fixedPref = 'tabbar.fixed.vertical';
			fixedLabel = 'label-vertical';
		}
		else {
			fixedPref = 'tabbar.fixed.horizontal';
			fixedLabel = 'label-horizontal';
		}
		let fixed = items[this.kMENUITEM_FIXED];
		fixed.setAttribute('label', fixed.getAttribute(fixedLabel));
		if (this.getTreePref(fixedPref))
			fixed.setAttribute('checked', true);
		else
			fixed.removeAttribute('checked');

		sep = this.evaluateXPath(
			'descendant::xul:menuseparator[starts-with(@id, "'+this.kMENUITEM_AUTOHIDE_SEPARATOR+'")]',
			aEvent.currentTarget,
			XPathResult.FIRST_ORDERED_NODE_TYPE
		).singleNodeValue;
		if (autohide.getAttribute('hidden') != 'true' ||
			fixed.getAttribute('hidden') != 'true') {
			sep.removeAttribute('hidden');
		}
		else {
			sep.setAttribute('hidden', true);
		}
	},
 
	initAllTabsPopup : function TSTBrowser_initAllTabsPopup(aEvent) 
	{
		if (!this.getTreePref('enableSubtreeIndent.allTabsPopup')) return;
		var items = aEvent.target.childNodes;
		var tabs = this.getTabs(this.mTabBrowser);
		for (var i = 0, maxi = items.length; i < maxi; i++)
		{
			items[i].style.paddingLeft = tabs.snapshotItem(i).getAttribute(this.kNEST)+'em';
		}
	},
   
/* drag and drop */ 
	
	get tabbarDNDObserver() 
	{
		return this._tabbarDNDObserver || (this._tabbarDNDObserver = new TreeStyleTabBrowserTabbarDNDObserver(this));
	},
 
	get panelDNDObserver() 
	{
		return this._panelDNDObserver || (this._panelDNDObserver = new TreeStyleTabBrowserTabpanelDNDObserver(this));
	},
 
	getCurrentDragSession : function TSTBrowser_getCurrentDragSession() 
	{
		return Components
				.classes['@mozilla.org/widget/dragservice;1']
				.getService(Components.interfaces.nsIDragService)
				.getCurrentSession();
	},
 
	getDropAction : function TSTBrowser_getDropAction(aEvent, aDragSession) 
	{
		if (!aDragSession)
			aDragSession = this.getCurrentDragSession();

		var tab = aDragSession ? this.getTabFromChild(aDragSession.sourceNode) : null ;
		this.ensureTabInitialized(tab);

		var info = this.getDropActionInternal(aEvent, tab);
		info.canDrop = true;
		info.source = tab;
		if (tab) {
			var isCopy = this.isAccelKeyPressed(aEvent);
			if (isCopy && 'duplicateTab' in this.mTabBrowser) {
				info.action |= this.kACTION_DUPLICATE;
			}
			if (
				!isCopy &&
				this.getTabBrowserFromChild(tab) != this.mTabBrowser &&
				(
					('duplicateTab' in this.mTabBrowser) ||
					('swapBrowsersAndCloseOther' in this.mTabBrowser)
				)
				) {
				info.action |= this.kACTION_IMPORT;
			}

			if (info.action & this.kACTIONS_FOR_DESTINATION) {
				if (info.action & this.kACTION_MOVE) info.action ^= this.kACTION_MOVE;
				if (info.action & this.kACTION_STAY) info.action ^= this.kACTION_STAY;
			}

			if (info.action & this.kACTION_ATTACH) {
				if (info.parent == tab) {
					info.canDrop = false;
				}
				else {
					var orig = tab;
					tab  = info.target;
					while (tab = this.getParentTab(tab))
					{
						if (tab != orig) continue;
						info.canDrop = false;
						break;
					}
				}
			}
		}
		return info;
	},
	
	getDropActionInternal : function TSTBrowser_getDropActionInternal(aEvent, aSourceTab) 
	{
		var tab        = aEvent.target;
		var b          = this.mTabBrowser;
		var tabs       = this.getTabsArray(b);
		var lastTabIndex = tabs.length -1;
		var isInverted = this.isVertical ? false : window.getComputedStyle(b.parentNode, null).direction == 'rtl';
		var info       = {
				target       : null,
				position     : null,
				action       : null,
				parent       : null,
				insertBefore : null
			};

		var isTabMoveFromOtherWindow = aSourceTab && aSourceTab.ownerDocument != document;
		var isNewTabAction = !aSourceTab || aSourceTab.ownerDocument != document;

		if (tab.localName != 'tab') {
			var action = isTabMoveFromOtherWindow ? this.kACTION_STAY : (this.kACTION_MOVE | this.kACTION_PART) ;
			if (isNewTabAction) action |= this.kACTION_NEWTAB;
			if (aEvent[this.positionProp] < tabs[0].boxObject[this.positionProp]) {
				info.target   = info.parent = info.insertBefore = tabs[0];
				info.position = isInverted ? this.kDROP_AFTER : this.kDROP_BEFORE ;
				info.action   = action;
				return info;
			}
			else if (aEvent[this.positionProp] > tabs[lastTabIndex].boxObject[this.positionProp] + tabs[lastTabIndex].boxObject[this.sizeProp]) {
				info.target   = info.parent = tabs[lastTabIndex];
				info.position = isInverted ? this.kDROP_BEFORE : this.kDROP_AFTER ;
				info.action   = action;
				return info;
			}
			else {
				info.target = tabs[Math.min(b.getNewIndex(aEvent), lastTabIndex)];
			}
		}
		else {
			this.ensureTabInitialized(tab);
			info.target = tab;
		}

		var boxPos  = tab.boxObject[this.positionProp];
		var boxUnit = Math.round(tab.boxObject[this.sizeProp] / 3);
		if (aEvent[this.positionProp] < boxPos + boxUnit) {
			info.position = isInverted ? this.kDROP_AFTER : this.kDROP_BEFORE ;
		}
		else if (aEvent[this.positionProp] > boxPos + boxUnit + boxUnit) {
			info.position = isInverted ? this.kDROP_BEFORE : this.kDROP_AFTER ;
		}
		else {
			info.position = this.kDROP_ON;
		}

		switch (info.position)
		{
			case this.kDROP_ON:
				info.action       = this.kACTION_STAY | this.kACTION_ATTACH;
				info.parent       = tab;
				var visible = this.getNextVisibleTab(tab);
				info.insertBefore = this.getTreePref('insertNewChildAt') == this.kINSERT_FISRT ?
						(this.getFirstChildTab(tab) || visible) :
						(this.getNextSiblingTab(tab) || this.getNextTab(this.getLastDescendantTab(tab)) || visible);
				break;

			case this.kDROP_BEFORE:
/*
	[TARGET  ] <EFBFBD><EFBFBD>part from parent, and move

	  [      ]
	[TARGET  ] <EFBFBD><EFBFBD>attach to the parent of the target, and move

	[        ]
	[TARGET  ] <EFBFBD><EFBFBD>attach to the parent of the target, and move

	[        ]
	  [TARGET] <EFBFBD><EFBFBD>attach to the parent of the target (previous tab), and move
*/
				var prevTab = this.getPreviousVisibleTab(tab);
				if (!prevTab) {
					info.action       = this.kACTION_MOVE | this.kACTION_PART;
					info.insertBefore = tabs[0];
				}
				else {
					var prevLevel   = Number(prevTab.getAttribute(this.kNEST));
					var targetNest = Number(tab.getAttribute(this.kNEST));
					info.parent       = (prevLevel < targetNest) ? prevTab : this.getParentTab(tab) ;
					info.action       = this.kACTION_MOVE | (info.parent ? this.kACTION_ATTACH : this.kACTION_PART );
					info.insertBefore = tab;
				}
				break;

			case this.kDROP_AFTER:
/*
	[TARGET  ] <EFBFBD><EFBFBD>if the target has a parent, attach to it and and move

	  [TARGET] <EFBFBD><EFBFBD>attach to the parent of the target, and move
	[        ]

	[TARGET  ] <EFBFBD><EFBFBD>attach to the parent of the target, and move
	[        ]

	[TARGET  ] <EFBFBD><EFBFBD>attach to the target, and move
	  [      ]
*/
				var nextTab = this.getNextVisibleTab(tab);
				if (!nextTab) {
					info.action = this.kACTION_MOVE | this.kACTION_ATTACH;
					info.parent = this.getParentTab(tab);
				}
				else {
					var targetNest = Number(tab.getAttribute(this.kNEST));
					var nextLevel   = Number(nextTab.getAttribute(this.kNEST));
					info.parent       = (targetNest < nextLevel) ? tab : this.getParentTab(tab) ;
					info.action       = this.kACTION_MOVE | (info.parent ? this.kACTION_ATTACH : this.kACTION_PART );
					info.insertBefore = nextTab;
/*
	[TARGET   ] <EFBFBD><EFBFBD>attach dragged tab to the parent of the target as its next sibling
	  [DRAGGED]
*/
					if (aSourceTab == nextTab && this.getDescendantTabs(info.parent).length == 1) {
						info.action = this.kACTION_MOVE | this.kACTION_ATTACH;
						info.parent = this.getParentTab(tab);
						info.insertBefore = this.getNextTab(nextTab);
					}
				}
				break;
		}

		if (isNewTabAction) action |= this.kACTION_NEWTAB;

		return info;
	},
  
	performDrop : function TSTBrowser_performDrop(aInfo, aDraggedTab) 
	{
		var tabsInfo = this.getDraggedTabsInfoFromOneTab(aInfo, aDraggedTab);
		if (!tabsInfo.draggedTab) return false;

		aDraggedTab = tabsInfo.draggedTab;
		var draggedTabs = tabsInfo.draggedTabs;
		var draggedRoots = tabsInfo.draggedRoots;

		var targetBrowser = this.mTabBrowser;
		var tabs = this.getTabsArray(targetBrowser);

		var sourceWindow = aDraggedTab.ownerDocument.defaultView;
		var sourceBrowser = this.getTabBrowserFromChild(aDraggedTab);

		var draggedWholeTree = [].concat(draggedRoots);
		draggedRoots.forEach(function(aRoot) {
			draggedWholeTree = draggedWholeTree.concat(this.getDescendantTabs(aRoot));
		}, this);
		while (aInfo.insertBefore && draggedWholeTree.indexOf(aInfo.insertBefore) > -1)
		{
			aInfo.insertBefore = this.getNextTab(aInfo.insertBefore);
		}

		if (aInfo.action & this.kACTIONS_FOR_SOURCE) {
			if (aInfo.action & this.kACTION_PART) {
				this.partTabsOnDrop(draggedRoots);
			}
			else if (aInfo.action & this.kACTION_ATTACH) {
				this.attachTabsOnDrop(draggedRoots, aInfo.parent);
			}
			else {
				return false;
			}

			if ( // if this move will cause no change...
				sourceBrowser == targetBrowser &&
				sourceBrowser.treeStyleTab.getNextVisibleTab(draggedTabs[draggedTabs.length-1]) == aInfo.insertBefore
				) {
				// then, do nothing
				return true;
			}
		}


		// prevent Multiple Tab Handler feature
		targetBrowser.duplicatingSelectedTabs = true;
		targetBrowser.movingSelectedTabs = true;


		var newRoots = [];
		var shouldClose = (
				aInfo.action & this.kACTION_IMPORT &&
				this.getTabs(sourceBrowser).snapshotLength == draggedTabs.length
			);
		var oldTabs = [];
		var newTabs = [];
		var treeStructure = draggedTabs.map(function(aTab) {
				var parent = sourceBrowser.treeStyleTab.getParentTab(aTab);
				return parent ? draggedTabs.indexOf(parent) : -1 ;
			});

		var parentTabsArray = draggedTabs.map(function(aTab) {
				return (aInfo.action & this.kACTIONS_FOR_DESTINATION) ?
					sourceBrowser.treeStyleTab.getParentTab(aTab) : null ;
			}, this);

		// Firefox fails to "move" collapsed tabs. So, expand them first
		// and collapse them after they are moved.
		var collapseExpandState = [];
		if (aInfo.action & this.kACTION_IMPORT &&
			'swapBrowsersAndCloseOther' in targetBrowser) {
			draggedWholeTree.forEach(function(aTab) {
				collapseExpandState.push(this.getTabValue(aTab, this.kSUBTREE_COLLAPSED) == 'true');
				this.collapseExpandSubtree(aTab, false, true);
				this.collapseExpandTab(aTab, false, true);
			}, this);
		}

		var lastTabIndex = tabs.length -1;
		draggedTabs.forEach(function(aTab, aIndex) {
			var tab = aTab;
			if (aInfo.action & this.kACTIONS_FOR_DESTINATION) {
				var parent = parentTabsArray[aIndex];
				if (tabsInfo.isSelectionMove)
					sourceWindow.MultipleTabService.setSelection(aTab, false);
				if (aInfo.action & this.kACTION_IMPORT &&
					'swapBrowsersAndCloseOther' in targetBrowser) {
					tab = targetBrowser.addTab();
					tab.linkedBrowser.stop();
					tab.linkedBrowser.docShell;
					targetBrowser.swapBrowsersAndCloseOther(tab, aTab);
					targetBrowser.setTabTitle(tab);
				}
				else {
					tab = targetBrowser.duplicateTab(aTab);
					this.deleteTabValue(tab, this.kCHILDREN);
					this.deleteTabValue(tab, this.kPARENT);
					if (aInfo.action & this.kACTION_IMPORT)
						oldTabs.push(aTab);
				}
				newTabs.push(tab);
				if (tabsInfo.isSelectionMove)
					MultipleTabService.setSelection(tab, true);
				if (!parent || draggedTabs.indexOf(parent) < 0)
					newRoots.push(tab);
				lastTabIndex++;
			}

			var newIndex = aInfo.insertBefore ? aInfo.insertBefore._tPos : lastTabIndex ;
			if (aInfo.insertBefore && newIndex > tab._tPos) newIndex--;

			this.internallyTabMovingCount++;
			targetBrowser.moveTabTo(tab, newIndex);
			this.collapseExpandTab(tab, false, true);
			this.internallyTabMovingCount--;

		}, this);

		// close imported tabs from the source browser
		oldTabs.forEach(function(aTab) {
			sourceBrowser.removeTab(aTab);
		});
		if (shouldClose) this.closeOwner(sourceBrowser);

		// restore tree structure for newly opened tabs
		newTabs.forEach(function(aTab, aIndex) {
			var index = treeStructure[aIndex];
			if (index < 0) return;
			targetBrowser.treeStyleTab.attachTabTo(aTab, newTabs[index]);
		});
		newTabs.reverse();
		collapseExpandState.reverse();
		collapseExpandState.forEach(function(aCollapsed, aIndex) {
			this.collapseExpandSubtree(newTabs[aIndex], aCollapsed, true);
		}, this);

		if (aInfo.action & this.kACTIONS_FOR_DESTINATION &&
			aInfo.action & this.kACTION_ATTACH)
			this.attachTabsOnDrop(newRoots, aInfo.parent);

		// Multiple Tab Handler
		targetBrowser.movingSelectedTabs = false;
		targetBrowser.duplicatingSelectedTabs = false;

		return true;
	},
	
	getDraggedTabsInfoFromOneTab : function TSTBrowser_getDraggedTabsInfoFromOneTab(aInfo, aTab) 
	{
		aTab = this.getTabFromChild(aTab);
		if (!aTab)
			return {
				draggedTab      : null,
				draggedTabs     : [],
				draggedRoots    : [],
				isSelectionMove : false
			};

		var targetBrowser = this.mTabBrowser;
		var tabs = this.getTabsArray(targetBrowser);

		var draggedTabs = [aTab];
		var draggedRoots = [aTab];

		var sourceWindow = aTab.ownerDocument.defaultView;
		var sourceBrowser = this.getTabBrowserFromChild(aTab);


		var isSelectionMove = (
				'MultipleTabService' in sourceWindow &&
				sourceWindow.MultipleTabService.isSelected(aTab) &&
				MultipleTabService.allowMoveMultipleTabs
			);

		if (isSelectionMove) {
			draggedTabs = sourceWindow.MultipleTabService.getSelectedTabs(sourceBrowser);
			if (!(aInfo.action & this.kACTIONS_FOR_DESTINATION)) {
				draggedRoots = [];
				draggedTabs.forEach(function(aTab) {
					var parent = aTab,
						current;
					do {
						current = parent;
						parent = sourceBrowser.treeStyleTab.getParentTab(parent)
						if (parent && sourceWindow.MultipleTabService.isSelected(parent)) continue;
						draggedRoots.push(current);
						return;
					}
					while (parent);
				}, this);
			}
		}
		else if (aInfo.action & this.kACTIONS_FOR_DESTINATION) {
			draggedTabs = draggedTabs.concat(sourceBrowser.treeStyleTab.getDescendantTabs(aTab));
		}

		return {
			draggedTab      : aTab,
			draggedTabs     : draggedTabs,
			draggedRoots    : draggedRoots,
			isSelectionMove : isSelectionMove
		};
	},
 
	attachTabsOnDrop : function TSTBrowser_attachTabsOnDrop(aTabs, aParent) 
	{
		this.mTabBrowser.movingSelectedTabs = true; // Multiple Tab Handler
		aTabs.forEach(function(aTab) {
			if (!aTab.parentNode) return; // ignore removed tabs
			if (aParent)
				this.attachTabTo(aTab, aParent);
			else
				this.partTab(aTab);
			this.collapseExpandTab(aTab, false);
		}, this);
		this.mTabBrowser.movingSelectedTabs = false; // Multiple Tab Handler
	},
 
	partTabsOnDrop : function TSTBrowser_partTabsOnDrop(aTabs) 
	{
		this.mTabBrowser.movingSelectedTabs = true; // Multiple Tab Handler
		aTabs.forEach(function(aTab) {
			if (!aTab.parentNode) return; // ignore removed tabs
			this.partTab(aTab);
			this.collapseExpandTab(aTab, false);
		}, this);
		this.mTabBrowser.movingSelectedTabs = false; // Multiple Tab Handler
	},
 
	closeOwner : function TSTBrowser_closeOwner(aTabOwner) 
	{
		var w = aTabOwner.ownerDocument.defaultView;
		if (!w) return;
		if ('SplitBrowser' in w) {
			if ('getSubBrowserFromChild' in w.SplitBrowser) {
				var subbrowser = w.SplitBrowser.getSubBrowserFromChild(aTabOwner);
				if (subbrowser) {
					subbrowser.close();
					return;
				}
			}
			if (w.SplitBrowser.browsers.length) return;
		}
		w.close();
	},
  
	clearDropPosition : function TSTBrowser_clearDropPosition() 
	{
		var b = this.mTabBrowser;
		var xpathResult = this.evaluateXPath(
				'child::xul:tab[@'+this.kDROP_POSITION+']',
				b.mTabContainer
			);
		for (var i = 0, maxi = xpathResult.snapshotLength; i < maxi; i++)
		{
			xpathResult.snapshotItem(i).removeAttribute(this.kDROP_POSITION);
		}
	},
 
	isDraggingAllTabs : function TSTBrowser_isDraggingAllTabs(aTab) 
	{
		var actionInfo = {
				action : this.kACTIONS_FOR_DESTINATION | this.kACTION_IMPORT
			};
		var tabsInfo = this.getDraggedTabsInfoFromOneTab(actionInfo, aTab);
		return tabsInfo.draggedTabs.length == this.getTabs(this.mTabBrowser).snapshotLength;
	},
  
/* commands */ 
	
/* reset */ 
	
	resetTab : function TSTBrowser_resetTab(aTab, aPartChildren) 
	{
		if (aPartChildren)
			this.partAllChildren(aTab, {
				dontUpdateIndent : true,
				dontAnimate      : true
			});

		this.partTab(aTab, {
			dontUpdateIndent : true,
			dontAnimate      : true
		});

		/* reset attributes before restoring */
		aTab.removeAttribute(this.kID);
		aTab.removeAttribute(this.kPARENT);
		aTab.removeAttribute(this.kCHILDREN);
		aTab.removeAttribute(this.kSUBTREE_COLLAPSED);
		aTab.removeAttribute(this.kCOLLAPSED);
		aTab.removeAttribute(this.kCOLLAPSED_DONE);
		aTab.removeAttribute(this.kNEST);
		this.updateTabsIndent([aTab], undefined, undefined, true);
	},
 
	resetAllTabs : function TSTBrowser_resetAllTabs(aPartChildren) 
	{
		this.getTabsArray(this.mTabBrowser).forEach(function(aTab) {
			this.resetTab(aTab, aPartChildren);
		}, this);
	},
 
	get treeViewEnabled() /* PUBLIC API */ 
	{
		return this._treeViewEnabled;
	},
	set treeViewEnabled(aValue)
	{
		this._treeViewEnabled = aValue ? true : false ;
		if (this._treeViewEnabled) {
			let orient = this.isVertical ? 'vertical' : 'horizontal' ;
			if (this.getTreePref('allowSubtreeCollapseExpand.'+orient))
				this.browser.setAttribute(this.kALLOW_COLLAPSE, true);
			this.updateTabsIndent(this.rootTabs, undefined, undefined, true);
		}
		else {
			this.browser.removeAttribute(this.kALLOW_COLLAPSE);
			this.getTabsArray(this.browser).forEach(function(aTab) {
				this.updateTabIndent(aTab, 0, this.indentTarget, true);
			}, this);
		}
		return aValue;
	},
//	_treeViewEnabled : true,
  
/* attach/part */ 
	
	attachTabTo : function TSTBrowser_attachTabTo(aChild, aParent, aInfo) /* PUBLIC API */ 
	{
		var currentParent;
		if (
			!aChild ||
			!aParent ||
			aChild == aParent ||
			(currentParent = this.getParentTab(aChild)) == aParent
			) {
			/* PUBLIC API */
			let event = document.createEvent('Events');
			event.initEvent('TreeStyleTabAttached', true, true);
			event.parentTab = aParent;
			aChild.dispatchEvent(event);
			return;
		}

		shouldInheritIndent = (
			!currentParent ||
			(currentParent.getAttribute(this.kNEST) == aParent.getAttribute(this.kNEST))
		);

		this.ensureTabInitialized(aChild);
		this.ensureTabInitialized(aParent);

		if (!aInfo) aInfo = {};

		var id = aChild.getAttribute(this.kID);

		this.partTab(aChild, {
			dontUpdateIndent : true
		});

		var children = aParent.getAttribute(this.kCHILDREN)
						.split('|').filter(function(aId) {
							return this.getTabById(aId);
						}, this);

		var newIndex;

		var oldIndex = children.indexOf(id);
		if (oldIndex > -1) children.splice(oldIndex, 1);

		var insertBefore = aInfo.insertBefore ||
						(aInfo.dontMove ? this.getNextTab(aChild) : null );
		var beforeTab = insertBefore ? insertBefore.getAttribute(this.kID) : null ;
		var beforeIndex;
		if (beforeTab && (beforeIndex = children.indexOf(beforeTab)) > -1) {
			children.splice(beforeIndex, 0, id);
			newIndex = insertBefore._tPos;
		}
		else {
			children.push(id);
			if (aInfo.dontMove && children.length > 1) {
				children = children
							.map(this.getTabById, this)
							.sort(this.sortTabsByOrder)
							.map(function(aTab) {
								return aTab.getAttribute(this.kID);
							}, this);
			}
			let refTab = aParent;
			let descendant = this.getDescendantTabs(aParent);
			if (descendant.length) refTab = descendant[descendant.length-1];
			newIndex = refTab._tPos+1;
		}

		this.setTabValue(aParent, this.kCHILDREN, children.join('|'));
		this.setTabValue(aChild, this.kPARENT, aParent.getAttribute(this.kID));
		this.updateTabsCount(aParent);
		if (shouldInheritIndent && !aInfo.dontUpdateIndent)
			this.inheritTabIndent(aChild, aParent);

		if (!aInfo.dontMove) {
			if (newIndex > aChild._tPos) newIndex--;
			this.moveTabSubtreeTo(aChild, newIndex);
		}

		if (!aInfo.dontExpand) {
			if (this.getTreePref('autoCollapseExpandSubtreeOnSelect')) {
				if (this.shouldTabAutoExpanded(aParent))
					this.collapseExpandTreesIntelligentlyFor(aParent);
				var p = aParent;
				do {
					if (this.shouldTabAutoExpanded(p))
						this.collapseExpandSubtree(p, false, aInfo.dontAnimate);
				}
				while (p = this.getParentTab(p));
			}
			else if (this.shouldTabAutoExpanded(aParent)) {
				if (this.getTreePref('autoExpandSubtreeOnAppendChild')) {
					var p = aParent;
					do {
						if (this.shouldTabAutoExpanded(p))
							this.collapseExpandSubtree(p, false, aInfo.dontAnimate);
					}
					while (p = this.getParentTab(p));
				}
				else
					this.collapseExpandTab(aChild, true, aInfo.dontAnimate);
			}

			if (this.isCollapsed(aParent))
				this.collapseExpandTab(aChild, true, aInfo.dontAnimate);
		}
		else if (this.shouldTabAutoExpanded(aParent) ||
				this.isCollapsed(aParent)) {
			this.collapseExpandTab(aChild, true, aInfo.dontAnimate);
		}

		if (!aInfo.dontUpdateIndent) {
			this.updateTabsIndent([aChild], undefined, undefined, aInfo.dontAnimate);
			this.checkTabsIndentOverflow();
		}

		/* PUBLIC API */
		var event = document.createEvent('Events');
		event.initEvent('TreeStyleTabAttached', true, true);
		event.parentTab = aParent;
		aChild.dispatchEvent(event);
	},
 
	shouldTabAutoExpanded : function TSTBrowser_shouldTabAutoExpanded(aTab) 
	{
		return this.hasChildTabs(aTab) &&
				this.isSubtreeCollapsed(aTab);
	},
 
	partTab : function TSTBrowser_partTab(aChild, aInfo) /* PUBLIC API */ 
	{
		if (!aChild) return;
		if (!aInfo) aInfo = {};

		var parentTab = this.getParentTab(aChild);
		if (!parentTab) return;

		var id = aChild.getAttribute(this.kID);
		this.setTabValue(
			parentTab,
			this.kCHILDREN,
			parentTab.getAttribute(this.kCHILDREN)
				.split('|')
				.filter(function(aId) {
					return this.getTabById(aId) && aId != id;
				}, this).join('|')
		);
		if (!this.hasChildTabs(parentTab))
			this.setTabValue(parentTab, this.kSUBTREE_COLLAPSED, true);
		this.deleteTabValue(aChild, this.kPARENT);
		this.updateTabsCount(parentTab);

		if (!aInfo.dontUpdateIndent) {
			this.updateTabsIndent([aChild], undefined, undefined, aInfo.dontAnimate);
			this.checkTabsIndentOverflow();
		}

		/* PUBLIC API */
		var event = document.createEvent('Events');
		event.initEvent('TreeStyleTabParted', true, true);
		aChild.dispatchEvent(event);

		if (this.isGroupTab(parentTab) && !this.hasChildTabs(parentTab)) {
			window.setTimeout(function(aTabBrowser) {
				if (parentTab.parentNode)
					aTabBrowser.removeTab(parentTab);
				parentTab = null;
			}, 0, this.getTabBrowserFromChild(parentTab));
		}
	},
	detachTab : function TSTBrowser_detachTab(aChild, aInfo) // alias (unstable API!)
	{
		return this.partTab(aChild, aInfo);
	},
	
	partAllChildren : function TSTBrowser_partAllChildren(aTab, aInfo) 
	{
		this.getChildTabs(aTab).forEach(function(aTab) {
			this.partTab(aTab, aInfo);
		}, this);
	},
  
	updateTabsIndent : function TSTBrowser_updateTabsIndent(aTabs, aLevel, aTarget, aJustNow) 
	{
		if (!aTabs || !aTabs.length || !this._treeViewEnabled) return;

		if (aLevel === void(0)) {
			var parentTab = this.getParentTab(aTabs[0]);
			var aLevel = 0;
			while (parentTab)
			{
				aLevel++;
				parentTab = this.getParentTab(parentTab);
			}
		}

		var b = this.mTabBrowser;
		if (!aTarget) {
			let orient = this.isVertical ? 'vertical' : 'horizontal' ;
			aTarget = this.getTreePref('enableSubtreeIndent.'+orient) ? this.indentTarget : null ;
		}
		var margin = this.indent < 0 ? this.baseIndent : this.indent ;
		var indent = margin * aLevel;

		var multirow = this.isMultiRow();
		if (multirow) {
			let maxIndent = parseInt(aTabs[0].boxObject.height / 2);
			indent = Math.min(aLevel * 3, maxIndent);
		}

		Array.slice(aTabs).forEach(function(aTab) {
			if (!aTab.parentNode) return; // ignore removed tabs
			this.updateTabIndent(aTab, indent, aTarget, aJustNow);
			aTab.setAttribute(this.kNEST, aLevel);
			this.updateTabsIndent(this.getChildTabs(aTab), aLevel+1, aTarget, aJustNow);
		}, this);
	},
	updateTabsIndentWithDelay : function TSTBrowser_updateTabsIndentWithDelay(aTabs)
	{
		if (this.updateTabsIndentWithDelayTimer)
			window.clearTimeout(this.updateTabsIndentWithDelayTimer);

		this.updateTabsIndentWithDelayTabs = this.updateTabsIndentWithDelayTabs.concat(aTabs);
		this.updateTabsIndentWithDelayTimer = window.setTimeout(function(aSelf) {
			var tabs = [];
			aSelf.updateTabsIndentWithDelayTabs.forEach(function(aTab) {
				if (tabs.indexOf(aTab) < 0 && aTab.parentNode) tabs.push(aTab);
			});
			aSelf.updateTabsIndentWithDelayTabs = [];
			aSelf.updateTabsIndent(tabs);
			window.clearTimeout(aSelf.updateTabsIndentWithDelayTimer);
			aSelf.updateTabsIndentWithDelayTimer = null;
			tabs = null;
		}, 0, this);
	},
	updateTabsIndentWithDelayTabs : [],
	updateTabsIndentWithDelayTimer : null,
 
	updateTabIndent : function TSTBrowser_updateTabIndent(aTab, aIndent, aTarget, aJustNow) 
	{
		this.stopTabIndentAnimation(aTab);

		if (this.isMultiRow()) {
			let colors = '-moz-border-'+aTarget+'-colors:'+(function() {
				var retVal = [];
				for (var i = 1; i < aIndent; i++)
				{
					retVal.push('transparent');
				}
				retVal.push('ThreeDShadow');
				return retVal.length == 1 ? 'none' : retVal.join(' ') ;
			})()+' !important;';
			Array.slice(document.getAnonymousNodes(aTab)).forEach(function(aBox) {
				if (aBox.nodeType != Node.ELEMENT_NODE) return;
				aBox.setAttribute(
					'style',
					aBox.getAttribute('style').replace(/(-moz-)?border-(top|bottom)(-[^:]*)?.*:[^;]+;?/g, '') +
					'; border-'+aTarget+': solid transparent '+aIndent+'px !important;'+colors
				);
			}, this);

			return;
		}

		var regexp = this.indentRulesRegExp;
		var property = this.indentProp+'-'+aTarget;
		if (
			!this.animationEnabled ||
			aJustNow ||
			this.indentDuration < 1 ||
			!aTarget ||
			this.isCollapsed(aTab)
			) {
			aTab.setAttribute(
				'style',
				aTab.getAttribute('style')
					.replace(regexp, '')+';'+
					(aTarget ? property+':'+aIndent+'px !important;' : '' )
			);
			return;
		}

		var startIndent = this.getPropertyPixelValue(aTab, property);
		var delta       = aIndent - startIndent;
		var radian      = 90 * Math.PI / 180;
		var self        = this;
		aTab.__treestyletab__updateTabIndentTask = function(aTime, aBeginning, aChange, aDuration) {
			var indent, finished;
			if (aTime >= aDuration) {
				delete aTab.__treestyletab__updateTabIndentTask;
				indent = aIndent;
				finished = true;
			}
			else {
				indent = startIndent + (delta * Math.sin(aTime / aDuration * radian));
				finished = false;
			}
			aTab.setAttribute(
				'style',
				aTab.getAttribute('style').replace(regexp, '')+';'+
				property+':'+indent+'px !important;'
			);
			if (finished) {
				startIndent = null;
				delta = null;
				radian = null;
				self = null;
				aTab = null;
			}
			return finished;
		};
		window['piro.sakura.ne.jp'].animationManager.addTask(
			aTab.__treestyletab__updateTabIndentTask,
			0, 0, this.indentDuration
		);
	},
	stopTabIndentAnimation : function TSTBrowser_stopTabIndentAnimation(aTab)
	{
		window['piro.sakura.ne.jp'].animationManager.removeTask(
			aTab.__treestyletab__updateTabIndentTask
		);
	},
 
	inheritTabIndent : function TSTBrowser_inheritTabIndent(aNewTab, aExistingTab) 
	{
		var regexp = this.indentRulesRegExp;
		var indents = (aExistingTab.getAttribute('style') || '').match(regexp) || [];
		aNewTab.setAttribute(
			'style',
			aNewTab.getAttribute('style')
				.replace(regexp, '')+';'+indents.join(';')
		);
	},
 
	updateAllTabsIndent : function TSTBrowser_updateAllTabsIndent() 
	{
		this.updateTabsIndent(this.rootTabs, 0);
//		this.checkTabsIndentOverflow();
	},
 
	checkTabsIndentOverflow : function TSTBrowser_checkTabsIndentOverflow() 
	{
		if (this.checkTabsIndentOverflowTimer) {
			window.clearTimeout(this.checkTabsIndentOverflowTimer);
			this.checkTabsIndentOverflowTimer = null;
		}
		this.checkTabsIndentOverflowTimer = window.setTimeout(function(aSelf) {
			aSelf.checkTabsIndentOverflowCallback();
		}, 100, this);
	},
	checkTabsIndentOverflowTimer : null,
	checkTabsIndentOverflowCallback : function TSTBrowser_checkTabsIndentOverflowCallback()
	{
		var b    = this.mTabBrowser;
		var tabs = this.getArrayFromXPathResult(this.evaluateXPath(
				'child::xul:tab[@'+this.kNEST+' and not(@'+this.kNEST+'="0" or @'+this.kNEST+'="")]',
				b.mTabContainer
			));
		if (!tabs.length) return;

		var self = this;
		tabs.sort(function(aA, aB) { return Number(aA.getAttribute(self.kNEST)) - Number(aB.getAttribute(self.kNEST)); });
		var nest = tabs[tabs.length-1].getAttribute(this.kNEST);
		if (!nest) return;

		var oldIndent = this.indent;
		var indent    = (oldIndent < 0 ? this.baseIndent : oldIndent ) * nest;
		var maxIndentBase = Math.min(
					this.getFirstTab(b).boxObject[this.invertedSizeProp],
					b.mTabContainer.boxObject[this.invertedSizeProp]
				);
		if (!this.isVertical) {
			if (this._horizontalTabMaxIndentBase)
				maxIndentBase = this._horizontalTabMaxIndentBase;
			else
				this._horizontalTabMaxIndentBase = maxIndentBase;
		}
		var maxIndent = maxIndentBase * (this.isVertical ? 0.33 : 0.5 );

		var indentUnit = Math.max(Math.floor(maxIndent / nest), 1);
		if (indent > maxIndent) {
			this.indent = indentUnit;
		}
		else {
			this.indent = -1;
			if ((this.baseIndent * nest) > maxIndent)
				this.indent = indentUnit;
		}

		if (oldIndent != this.indent) {
			this.updateAllTabsIndent();
		}
	},
	_horizontalTabMaxIndentBase : 0,
 
	updateTabsCount : function TSTBrowser_updateTabsCount(aTab, aDontUpdateAncestor) 
	{
		var count = document.getAnonymousElementByAttribute(aTab, 'class', this.kCOUNTER);
		if (count) {
			count.setAttribute('value', '('+this.getDescendantTabs(aTab).length+')');
		}
		var parent = this.getParentTab(aTab);
		if (parent && !aDontUpdateAncestor)
			this.updateTabsCount(parent);
	},
  
/* move */ 
	
	moveTabSubtreeTo : function TSTBrowser_moveTabSubtreeTo(aTab, aIndex) 
	{
		if (!aTab) return;

		var b = this.mTabBrowser;
		this.subTreeMovingCount++;

		this.internallyTabMovingCount++;
		b.moveTabTo(aTab, aIndex);
		this.internallyTabMovingCount--;

		this.subTreeChildrenMovingCount++;
		this.internallyTabMovingCount++;
		this.getDescendantTabs(aTab).forEach(function(aDescendantTab, aIndex) {
			b.moveTabTo(aDescendantTab, aTab._tPos + aIndex + (aTab._tPos < aDescendantTab._tPos ? 1 : 0 ));
		}, this);
		this.internallyTabMovingCount--;
		this.subTreeChildrenMovingCount--;

		this.subTreeMovingCount--;
	},
	moveTabSubTreeTo : function() { return this.moveTabSubtreeTo.apply(this, arguments); }, // obsolete, for backward compatibility
 
	moveTabLevel : function TSTBrowser_moveTabLevel(aEvent) 
	{
		var b = this.mTabBrowser;
		var parentTab = this.getParentTab(b.mCurrentTab);
		if (aEvent.keyCode == KeyEvent.DOM_VK_RIGHT) {
			var prevTab = this.getPreviousSiblingTab(b.mCurrentTab);
			if ((!parentTab && prevTab) ||
				(parentTab && b.mCurrentTab != this.getFirstChildTab(parentTab))) {
				this.attachTabTo(b.mCurrentTab, prevTab);
				b.mCurrentTab.focus();
				return true;
			}
		}
		else if (aEvent.keyCode == KeyEvent.DOM_VK_LEFT && parentTab) {
			var grandParent = this.getParentTab(parentTab);
			if (grandParent) {
				this.attachTabTo(b.mCurrentTab, grandParent, {
					insertBefore : this.getNextSiblingTab(parentTab)
				});
				b.mCurrentTab.focus();
				return true;
			}
			else {
				var nextTab = this.getNextSiblingTab(parentTab);
				this.partTab(b.mCurrentTab);
				this.internallyTabMovingCount++;
				if (nextTab) {
					b.moveTabTo(b.mCurrentTab, nextTab._tPos - 1);
				}
				else {
					b.moveTabTo(b.mCurrentTab, this.getLastTab(b)._tPos);
				}
				this.internallyTabMovingCount--;
				b.mCurrentTab.focus();
				return true;
			}
		}
		return false;
	},
  
/* collapse/expand */ 
	
	collapseExpandSubtree : function TSTBrowser_collapseExpandSubtree(aTab, aCollapse, aJustNow) /* PUBLIC API */ 
	{
		if (!aTab) return;

		if (this.isSubtreeCollapsed(aTab) == aCollapse) return;

		var b = this.mTabBrowser;
		this.doingCollapseExpand = true;

		this.setTabValue(aTab, this.kSUBTREE_COLLAPSED, aCollapse);

		this.getChildTabs(aTab).forEach(function(aTab) {
			this.collapseExpandTab(aTab, aCollapse, aJustNow);
		}, this);

		if (!aCollapse)
			this.scrollToTabSubtree(aTab);

		this.doingCollapseExpand = false;
	},
 
	collapseExpandTab : function TSTBrowser_collapseExpandTab(aTab, aCollapse, aJustNow) 
	{
		if (!aTab || !this.getParentTab(aTab)) return;

		this.setTabValue(aTab, this.kCOLLAPSED, aCollapse);
		this.updateTabCollapsed(aTab, aCollapse, aJustNow);

		/* PUBLIC API */
		var event = document.createEvent('Events');
		event.initEvent('TreeStyleTabCollapsedStateChange', true, true);
		event.collapsed = aCollapse;
		aTab.dispatchEvent(event);

		var b = this.mTabBrowser;
		var parent;
		if (aCollapse && aTab == b.selectedTab && (parent = this.getParentTab(aTab))) {
			var newSelection = parent;
			while (this.isCollapsed(parent))
			{
				parent = this.getParentTab(parent);
				if (!parent) break;
				newSelection = parent;
			}
			b.selectedTab = newSelection;
		}

		if (!this.isSubtreeCollapsed(aTab)) {
			this.getChildTabs(aTab).forEach(function(aTab) {
				this.collapseExpandTab(aTab, aCollapse, aJustNow);
			}, this);
		}
	},
	updateTabCollapsed : function TSTBrowser_updateTabCollapsed(aTab, aCollapsed, aJustNow)
	{
		this.stopTabCollapseAnimation(aTab);

		aTab.removeAttribute(this.kX_OFFSET);
		aTab.removeAttribute(this.kY_OFFSET);

		if (
			!this.animationEnabled ||
			aJustNow ||
			this.collapseDuration < 1 ||
//			!this.isVertical ||
			!this.canCollapseSubtree()
			) {
			aTab.setAttribute(
				'style',
				aTab.getAttribute('style')
					.replace(this.collapseRulesRegExp, '')
					.replace(this.kOPACITY_RULE_REGEXP, '')
			);
			aTab.removeAttribute(this.kCOLLAPSING);
			if (aCollapsed)
				aTab.setAttribute(this.kCOLLAPSED_DONE, true);
			else
				aTab.removeAttribute(this.kCOLLAPSED_DONE);
			return;
		}

		var maxMargin;
		var offsetAttr;
		let (firstTab) {
			firstTab = this.getFirstTab(this.mTabBrowser);
			if (this.isVertical) {
				maxMargin = firstTab.boxObject.height;
				offsetAttr = this.kY_OFFSET;
				if (firstTab.style.height)
					aTab.style.height = firstTab.style.height;
			}
			else {
				maxMargin = firstTab.boxObject.width;
				offsetAttr = this.kX_OFFSET;
				if (firstTab.style.width)
					aTab.style.width = firstTab.style.width;
			}
		}

		var startMargin, endMargin, startOpacity, endOpacity;
		if (aCollapsed) {
			startMargin  = 0;
			endMargin    = maxMargin;
			startOpacity = 1;
			endOpacity   = 0;
		}
		else {
			aTab.setAttribute(offsetAttr, maxMargin);
			startMargin  = maxMargin;
			endMargin    = 0;
			startOpacity = 0;
			endOpacity   = 1;
		}
		var deltaMargin  = endMargin - startMargin;
		var deltaOpacity = endOpacity - startOpacity;
		var collapseProp = 'margin-'+this.collapseTarget;

		aTab.setAttribute(this.kCOLLAPSING, true);
		aTab.setAttribute(
			'style',
			aTab.getAttribute('style')
				.replace(this.collapseRulesRegExp, '')+';'+
				collapseProp+': -'+startMargin+'px !important;'+
				'opacity: '+startOpacity+' !important;'
		);

		if (!aCollapsed) aTab.removeAttribute(this.kCOLLAPSED_DONE);

		var radian = 90 * Math.PI / 180;
		var self   = this;
		aTab.__treestyletab__updateTabCollapsedTask = function(aTime, aBeginning, aChange, aDuration) {
			// If this is the last tab, negative scroll happens.
			// Then, we shouldn't do animation.
			var stopAnimation = false;
			var scrollBox = self.scrollBox;
			if (scrollBox) {
				if (scrollBox._scrollbox) scrollBox = scrollBox._scrollbox;
				if ('scrollTop' in scrollBox &&
					(scrollBox.scrollTop < 0 || scrollBox.scrollLeft < 0)) {
					scrollBox.scrollTop = 0;
					scrollBox.scrollLeft = 0;
					stopAnimation = true;
				}
			}
			if (aTime >= aDuration || stopAnimation) {
				delete aTab.__treestyletab__updateTabCollapsedTask;
				aTab.removeAttribute(self.kCOLLAPSING);
				if (aCollapsed) aTab.setAttribute(self.kCOLLAPSED_DONE, true);
				aTab.setAttribute(
					'style',
					aTab.getAttribute('style')
						.replace(self.collapseRulesRegExp, '')
						.replace(self.kOPACITY_RULE_REGEXP, '')
				);
				aTab.removeAttribute(offsetAttr);

				maxMargin = null;
				offsetAttr = null;
				startMargin = null;
				endMargin = null;
				startOpacity = null;
				endOpacity = null;
				deltaMargin = null;
				deltaOpacity = null;
				collapseProp = null;
				radian = null;
				self = null;
				aTab = null;

				return true;
			}
			else {
				var power   = Math.sin(aTime / aDuration * radian);
				var margin  = startMargin + (deltaMargin * power);
				var opacity = startOpacity + (deltaOpacity  * power);
				aTab.setAttribute(
					'style',
					aTab.getAttribute('style')
						.replace(self.collapseRulesRegExp, '')+';'+
						collapseProp+': -'+margin+'px !important;'+
						'opacity: '+opacity+' !important;'
				);
				aTab.setAttribute(offsetAttr, maxMargin);
				return false;
			}
		};
		window['piro.sakura.ne.jp'].animationManager.addTask(
			aTab.__treestyletab__updateTabCollapsedTask,
			0, 0, this.collapseDuration
		);
	},
	kOPACITY_RULE_REGEXP : /opacity\s*:[^;]+;?/,
	stopTabCollapseAnimation : function TSTBrowser_stopTabCollapseAnimation(aTab)
	{
		window['piro.sakura.ne.jp'].animationManager.removeTask(
			aTab.__treestyletab__updateTabCollapsedTask
		);
	},
 
	collapseExpandTreesIntelligentlyFor : function TSTBrowser_collapseExpandTreesIntelligentlyFor(aTab, aJustNow) 
	{
		if (!aTab ||
			this.doingCollapseExpand ||
			!this.canCollapseSubtree())
			return;

		var b = this.mTabBrowser;
		var sameParentTab = this.getParentTab(aTab);
		var expandedParentTabs = [
				aTab.getAttribute(this.kID)
			];
		var parentTab = aTab;
		while (parentTab = this.getParentTab(parentTab))
		{
			expandedParentTabs.push(parentTab.getAttribute(this.kID));
		}
		expandedParentTabs = expandedParentTabs.join('|');

		var xpathResult = this.evaluateXPath(
				'child::xul:tab[@'+this.kCHILDREN+' and not(@'+this.kCOLLAPSED+'="true") and not(@'+this.kSUBTREE_COLLAPSED+'="true") and @'+this.kID+' and not(contains("'+expandedParentTabs+'", @'+this.kID+'))]',
				b.mTabContainer
			);
		var collapseTab;
		var dontCollapse;
		for (var i = 0, maxi = xpathResult.snapshotLength; i < maxi; i++)
		{
			dontCollapse = false;
			collapseTab  = xpathResult.snapshotItem(i);

			parentTab = this.getParentTab(collapseTab);
			if (parentTab) {
				dontCollapse = true;
				if (!this.isSubtreeCollapsed(parentTab)) {
					do {
						if (expandedParentTabs.indexOf(parentTab.getAttribute(this.kID)) < 0)
							continue;
						dontCollapse = false;
						break;
					}
					while (parentTab = this.getParentTab(parentTab));
				}
			}

			if (!dontCollapse)
				this.collapseExpandSubtree(collapseTab, true, aJustNow);
		}

		this.collapseExpandSubtree(aTab, false, aJustNow);
	},
	collapseExpandTreesIntelligentlyWithDelayFor : function TSTBrowser_collapseExpandTreesIntelligentlyWithDelayFor(aTab)
	{
		if (this.doingCollapseExpand) return;
		if (this.cETIWDFTimer)
			window.clearTimeout(this.cETIWDFTimer);
		this.cETIWDFTimer = window.setTimeout(function(aSelf) {
			window.clearTimeout(aSelf.cETIWDFTimer);
			aSelf.cETIWDFTimer = null;
			aSelf.collapseExpandTreesIntelligentlyFor(aTab);
		}, 0, this);
	},
	cETIWDFTimer : null,
 
	collapseExpandAllSubtree : function TSTBrowser_collapseExpandAllSubtree(aCollapse, aJustNow) 
	{
		var xpathResult = this.evaluateXPath(
				'child::xul:tab[@'+this.kID+' and @'+this.kCHILDREN+
				(
					aCollapse ?
						' and not(@'+this.kSUBTREE_COLLAPSED+'="true")' :
						' and @'+this.kSUBTREE_COLLAPSED+'="true"'
				)+
				']',
				this.mTabBrowser.mTabContainer
			);
		for (var i = 0, maxi = xpathResult.snapshotLength; i < maxi; i++)
		{
			this.collapseExpandSubtree(xpathResult.snapshotItem(i), aCollapse, aJustNow);
		}
	},
  
/* scroll */ 
	
	scrollTo : function TSTBrowser_scrollTo(aEndX, aEndY) 
	{
		if (this.animationEnabled || this.smoothScrollEnabled) {
			this.smoothScrollTo(aEndX, aEndY);
		}
		else {
			try {
				this.scrollBoxObject.scrollTo(aEndX, aEndY);
			}
			catch(e) {
			}
		}
	},
	
	smoothScrollTo : function TSTBrowser_smoothScrollTo(aEndX, aEndY) 
	{
		var b = this.mTabBrowser;
		window['piro.sakura.ne.jp'].animationManager.removeTask(this.smoothScrollTask);

		var scrollBoxObject = this.scrollBoxObject;
		var x = {}, y = {};
		scrollBoxObject.getPosition(x, y);
		var startX = x.value;
		var startY = y.value;
		var deltaX = aEndX - startX;
		var deltaY = aEndY - startY;

		var radian = 90 * Math.PI / 180;
		var self = this;
		this.smoothScrollTask = function(aTime, aBeginning, aChange, aDuration) {
			var scrollBoxObject = self.scrollBoxObject;
			if (aTime >= aDuration) {
				scrollBoxObject.scrollTo(aEndX, aEndY);

				b = null;
				scrollBoxObject = null;
				x = null;
				y = null;
				startX = null;
				startY = null;
				radian = null;
				self = null;

				return true;
			}

			var power = Math.sin(aTime / aDuration * radian);
			var newX = startX + parseInt(deltaX * power);
			var newY = startY + parseInt(deltaY * power);

			var x = {}, y = {};
			scrollBoxObject.getPosition(x, y);

			var w = {}, h = {};
			scrollBoxObject.getScrolledSize(w, h);
			var maxX = Math.max(0, w.value - scrollBoxObject.width);
			var maxY = Math.max(0, h.value - scrollBoxObject.height);
			scrollBoxObject.scrollTo(newX, newY);
			return false;
		};
		window['piro.sakura.ne.jp'].animationManager.addTask(
			this.smoothScrollTask,
			0, 0, this.smoothScrollDuration
		);
	},
	smoothScrollTask : null,
  
	scrollToTab : function TSTBrowser_scrollToTab(aTab) 
	{
		if (!aTab || this.isTabInViewport(aTab)) return;

		var b = this.mTabBrowser;

		var scrollBoxObject = this.scrollBoxObject;
		var w = {}, h = {};
		try {
			scrollBoxObject.getScrolledSize(w, h);
		}
		catch(e) { // Tab Mix Plus (or others)
			return;
		}

		var targetTabBox = aTab.boxObject;
		var baseTabBox = aTab.parentNode.firstChild.boxObject;

		var xOffset = this.getXOffsetOfTab(aTab);
		var yOffset = this.getYOffsetOfTab(aTab);

		var targetX = (aTab.boxObject.screenX + xOffset < scrollBoxObject.screenX) ?
			(targetTabBox.screenX + xOffset - baseTabBox.screenX) - (targetTabBox.width * 0.5) :
			(targetTabBox.screenX + xOffset - baseTabBox.screenX) - scrollBoxObject.width + (targetTabBox.width * 1.5) ;

		var targetY = (aTab.boxObject.screenY + yOffset < scrollBoxObject.screenY) ?
			(targetTabBox.screenY + yOffset - baseTabBox.screenY) - (targetTabBox.height * 0.5) :
			(targetTabBox.screenY + yOffset - baseTabBox.screenY) - scrollBoxObject.height + (targetTabBox.height * 1.5) ;

		this.scrollTo(targetX, targetY);
	},
 
	scrollToTabSubtree : function TSTBrowser_scrollToTabSubtree(aTab) 
	{
		var b          = this.mTabBrowser;
		var descendant = this.getDescendantTabs(aTab);
		var lastVisible = aTab;
		for (var i = descendant.length-1; i > -1; i--)
		{
			if (this.isCollapsed(descendant[i])) continue;
			lastVisible = descendant[i];
			break;
		}

		if (this.isTabInViewport(aTab) && this.isTabInViewport(lastVisible)) {
			return;
		}

		var containerPosition = b.mStrip.boxObject[this.positionProp];
		var containerSize     = b.mStrip.boxObject[this.sizeProp];
		var parentPosition    = aTab.boxObject[this.positionProp];
		var lastPosition      = lastVisible.boxObject[this.positionProp];
		var tabSize           = lastVisible.boxObject[this.sizeProp];

		if (lastPosition - parentPosition + tabSize > containerSize - tabSize) { // out of screen
			var endPos = parentPosition - this.getFirstTab(b).boxObject[this.positionProp] - tabSize * 0.5;
			var endX = this.isVertical ? 0 : endPos ;
			var endY = this.isVertical ? endPos : 0 ;
			this.scrollTo(endX, endY);
		}
		else if (!this.isTabInViewport(aTab) && this.isTabInViewport(lastVisible)) {
			this.scrollToTab(aTab);
		}
		else if (this.isTabInViewport(aTab) && !this.isTabInViewport(lastVisible)) {
			this.scrollToTab(lastVisible);
		}
		else if (parentPosition < containerPosition) {
			this.scrollToTab(aTab);
		}
		else {
			this.scrollToTab(lastVisible);
		}
	},
   
/* show/hide tab bar */ 
	get autoHide()
	{
		return this._autoHide || (this._autoHide = new TreeStyleTabBrowserAutoHide(this));
	},

	// for backward compatibility
	get tabbarShown() { return this.autoHide.expanded; },
	set tabbarShown(aValue) { if (aValue) this.autoHide.show(); else this.autoHide.hide(); return aValue; },
	get tabbarExpanded() { return this.autoHide.expanded; },
	set tabbarExpanded(aValue) { return this.tabbarShown = aValue; },
	get tabbarResizing() { return this.autoHide.isResizing; },
	set tabbarResizing(aValue) { return this.autoHide.isResizing = aValue; },
	get togglerSize() { return this.autoHide.togglerSize; },
	set togglerSize(aValue) { return this.autoHide.togglerSize = aValue; },
	get sensitiveArea() { return this.autoHide.sensitiveArea; },
	set sensitiveArea(aValue) { return this.autoHide.sensitiveArea = aValue; },
	get lastMouseDownTarget() { return this.autoHide.lastMouseDownTarget; },
	set lastMouseDownTarget(aValue) { return this.autoHide.lastMouseDownTarget = aValue; },

	get tabbarWidth() { return this.autoHide.width; },
	set tabbarWidth(aValue) { return this.autoHide.widthwidth = aValue; },
	get tabbarHeight() { return this.autoHide.height; },
	set tabbarHeight(aValue) { return this.autoHide.height = aValue; },
	get splitterWidth() { return this.autoHide.splitterWidth; },

	set autoHideShown() { return this.autoHide.expanded; },
	set autoHideShown(aValue) { return this.tabbarShown = aValue; },
	set autoHideXOffset() { return this.autoHide.XOffset; },
	set autoHideYOffset() { return this.autoHide.YOffset; },
	get autoHideMode() { return this.autoHide.mode; },
	set autoHideMode(aValue) { return this.autoHide.mode = aValue; },

	updateAutoHideMode : function TSTBrowser_updateAutoHideMode() { this.autoHide.updateAutoHideMode(); },
	showHideTabbarInternal : function TSTBrowser_showHideTabbarInternal(aReason) { this.autoHide.showHideInternal(aReason); },
	showTabbar : function TSTBrowser_showTabbar(aReason) { this.autoHide.show(aReason); },
	hideTabbar : function TSTBrowser_hideTabbar(aReason) { this.autoHide.hide(aReason); },
	redrawContentArea : function TSTBrowser_redrawContentArea() { this.autoHide.redrawContentArea(); },
	drawTabbarCanvas : function TSTBrowser_drawTabbarCanvas() { this.autoHide.drawBG(); },
	get splitterBorderColor() { this.autoHide.splitterBorderColor; },
	clearTabbarCanvas : function TSTBrowser_clearTabbarCanvas() { this.autoHide.clearBG(); },
	updateTabbarTransparency : function TSTBrowser_updateTabbarTransparency() { this.autoHide.updateTransparency(); },

	get autoHideEnabled() { return this.autoHide.enabled; },
	set autoHideEnabled(aValue) { return this.autoHide.enabled = aValue; },
	startAutoHide : function TSTBrowser_startAutoHide() { this.autoHide.start(); },
	endAutoHide : function TSTBrowser_endAutoHide() { this.autoHide.end(); },
	startAutoHideForFullScreen : function TSTBrowser_startAutoHideForFullScreen() { this.autoHide.startForFullScreen(); },
	endAutoHideForFullScreen : function TSTBrowser_endAutoHideForFullScreen() { this.autoHide.endForFullScreen(); },

	startListenMouseMove : function TSTBrowser_startListenMouseMove() { this.autoHide.startListenMouseMove(); },
	endListenMouseMove : function TSTBrowser_endListenMouseMove() { this.autoHide.endListenMouseMove(); },
	get shouldListenMouseMove() { return this.autoHide.shouldListenMouseMove; },
	showHideTabbarOnMousemove : function TSTBrowser_showHideTabbarOnMousemove() { this.autoHide.showHideOnMousemove(); },
	cancelShowHideTabbarOnMousemove : function TSTBrowser_cancelShowHideTabbarOnMousemove() { this.autoHide.cancelShowHideOnMousemove(); },
	showTabbarForFeedback : function TSTBrowser_showTabbarForFeedback() { this.autoHide.showForFeedback(); },
	delayedShowTabbarForFeedback : function TSTBrowser_delayedShowTabbarForFeedback() { this.autoHide.delayedShowForFeedback(); },
	cancelHideTabbarForFeedback : function TSTBrowser_cancelHideTabbarForFeedback() { this.autoHide.cancelHideForFeedback(); }
  
}; 

TreeStyleTabBrowser.prototype.__proto__ = TreeStyleTabService;