Source/WebInspectorUI/UserInterface/Views/ContentBrowser.js - WebKit - Git at Google

 /*
  * Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */

 WebInspector.ContentBrowser = class ContentBrowser extends WebInspector.View
 {
     constructor(element, delegate, disableBackForward, disableFindBanner)
     {
         super(element);

         this.element.classList.add("content-browser");

         this._navigationBar = new WebInspector.NavigationBar;
         this.addSubview(this._navigationBar);

         this._contentViewContainer = new WebInspector.ContentViewContainer;
         this._contentViewContainer.addEventListener(WebInspector.ContentViewContainer.Event.CurrentContentViewDidChange, this._currentContentViewDidChange, this);
         this.addSubview(this._contentViewContainer);

         if (!disableBackForward) {
             let isRTL = WebInspector.resolvedLayoutDirection() === WebInspector.LayoutDirection.RTL;

             let goBack = () => { this.goBack(); };
             let goForward = () => { this.goForward(); };

             let backShortcutKey = isRTL ? WebInspector.KeyboardShortcut.Key.Right : WebInspector.KeyboardShortcut.Key.Left;
             let forwardShortcutKey = isRTL ? WebInspector.KeyboardShortcut.Key.Left : WebInspector.KeyboardShortcut.Key.Right;
             this._backKeyboardShortcut = new WebInspector.KeyboardShortcut(WebInspector.KeyboardShortcut.Modifier.CommandOrControl | WebInspector.KeyboardShortcut.Modifier.Control, backShortcutKey, goBack, this.element);
             this._forwardKeyboardShortcut = new WebInspector.KeyboardShortcut(WebInspector.KeyboardShortcut.Modifier.CommandOrControl | WebInspector.KeyboardShortcut.Modifier.Control, forwardShortcutKey, goForward, this.element);

             let leftArrow = "Images/BackForwardArrows.svg#left-arrow-mask";
             let rightArrow = "Images/BackForwardArrows.svg#right-arrow-mask";
             let backButtonImage = isRTL ? rightArrow : leftArrow;
             let forwardButtonImage = isRTL ? leftArrow : rightArrow;

             this._backNavigationItem = new WebInspector.ButtonNavigationItem("back", WebInspector.UIString("Back (%s)").format(this._backKeyboardShortcut.displayName), backButtonImage, 8, 13);
             this._backNavigationItem.addEventListener(WebInspector.ButtonNavigationItem.Event.Clicked, goBack);
             this._backNavigationItem.enabled = false;
             this._navigationBar.addNavigationItem(this._backNavigationItem);

             this._forwardNavigationItem = new WebInspector.ButtonNavigationItem("forward", WebInspector.UIString("Forward (%s)").format(this._forwardKeyboardShortcut.displayName), forwardButtonImage, 8, 13);
             this._forwardNavigationItem.addEventListener(WebInspector.ButtonNavigationItem.Event.Clicked, goForward);
             this._forwardNavigationItem.enabled = false;
             this._navigationBar.addNavigationItem(this._forwardNavigationItem);

             this._navigationBar.addNavigationItem(new WebInspector.DividerNavigationItem);
         }

         if (!disableFindBanner) {
             this._findBanner = new WebInspector.FindBanner(this);
             this._findBanner.addEventListener(WebInspector.FindBanner.Event.DidShow, this._findBannerDidShow, this);
             this._findBanner.addEventListener(WebInspector.FindBanner.Event.DidHide, this._findBannerDidHide, this);
         }

         this._hierarchicalPathNavigationItem = new WebInspector.HierarchicalPathNavigationItem;
         this._hierarchicalPathNavigationItem.addEventListener(WebInspector.HierarchicalPathNavigationItem.Event.PathComponentWasSelected, this._hierarchicalPathComponentWasSelected, this);
         this._navigationBar.addNavigationItem(this._hierarchicalPathNavigationItem);

         this._contentViewSelectionPathNavigationItem = new WebInspector.HierarchicalPathNavigationItem;

         this._dividingFlexibleSpaceNavigationItem = new WebInspector.FlexibleSpaceNavigationItem;
         this._navigationBar.addNavigationItem(this._dividingFlexibleSpaceNavigationItem);

         WebInspector.ContentView.addEventListener(WebInspector.ContentView.Event.SelectionPathComponentsDidChange, this._contentViewSelectionPathComponentDidChange, this);
         WebInspector.ContentView.addEventListener(WebInspector.ContentView.Event.SupplementalRepresentedObjectsDidChange, this._contentViewSupplementalRepresentedObjectsDidChange, this);
         WebInspector.ContentView.addEventListener(WebInspector.ContentView.Event.NumberOfSearchResultsDidChange, this._contentViewNumberOfSearchResultsDidChange, this);
         WebInspector.ContentView.addEventListener(WebInspector.ContentView.Event.NavigationItemsDidChange, this._contentViewNavigationItemsDidChange, this);

         this._delegate = delegate || null;

         this._currentContentViewNavigationItems = [];
     }

     // Public

     get navigationBar()
     {
         return this._navigationBar;
     }

     get contentViewContainer()
     {
         return this._contentViewContainer;
     }

     get delegate()
     {
         return this._delegate;
     }

     set delegate(newDelegate)
     {
         this._delegate = newDelegate || null;
     }

     get currentContentView()
     {
         return this._contentViewContainer.currentContentView;
     }

     get currentRepresentedObjects()
     {
         var representedObjects = [];

         var lastComponent = this._hierarchicalPathNavigationItem.lastComponent;
         if (lastComponent && lastComponent.representedObject)
             representedObjects.push(lastComponent.representedObject);

         lastComponent = this._contentViewSelectionPathNavigationItem.lastComponent;
         if (lastComponent && lastComponent.representedObject)
             representedObjects.push(lastComponent.representedObject);

         var currentContentView = this.currentContentView;
         if (currentContentView) {
             var supplementalRepresentedObjects = currentContentView.supplementalRepresentedObjects;
             if (supplementalRepresentedObjects && supplementalRepresentedObjects.length)
                 representedObjects = representedObjects.concat(supplementalRepresentedObjects);
         }

         return representedObjects;
     }

     showContentViewForRepresentedObject(representedObject, cookie, extraArguments)
     {
         var contentView = this.contentViewForRepresentedObject(representedObject, false, extraArguments);
         return this._contentViewContainer.showContentView(contentView, cookie);
     }

     showContentView(contentView, cookie)
     {
         return this._contentViewContainer.showContentView(contentView, cookie);
     }

     contentViewForRepresentedObject(representedObject, onlyExisting, extraArguments)
     {
         return this._contentViewContainer.contentViewForRepresentedObject(representedObject, onlyExisting, extraArguments);
     }

     updateHierarchicalPathForCurrentContentView()
     {
         var currentContentView = this.currentContentView;
         this._updateHierarchicalPathNavigationItem(currentContentView ? currentContentView.representedObject : null);
     }

     canGoBack()
     {
         var currentContentView = this.currentContentView;
         if (currentContentView && currentContentView.canGoBack())
             return true;
         return this._contentViewContainer.canGoBack();
     }

     canGoForward()
     {
         var currentContentView = this.currentContentView;
         if (currentContentView && currentContentView.canGoForward())
             return true;
         return this._contentViewContainer.canGoForward();
     }

     goBack()
     {
         var currentContentView = this.currentContentView;
         if (currentContentView && currentContentView.canGoBack()) {
             currentContentView.goBack();
             this._updateBackForwardButtons();
             return;
         }

         this._contentViewContainer.goBack();

         // The _updateBackForwardButtons function is called by _currentContentViewDidChange,
         // so it does not need to be called here.
     }

     goForward()
     {
         var currentContentView = this.currentContentView;
         if (currentContentView && currentContentView.canGoForward()) {
             currentContentView.goForward();
             this._updateBackForwardButtons();
             return;
         }

         this._contentViewContainer.goForward();

         // The _updateBackForwardButtons function is called by _currentContentViewDidChange,
         // so it does not need to be called here.
     }

     showFindBanner()
     {
         if (!this._findBanner)
             return;

         var currentContentView = this.currentContentView;
         if (!currentContentView || !currentContentView.supportsSearch)
             return;

         if (currentContentView.supportsCustomFindBanner) {
             currentContentView.showCustomFindBanner();
             return;
         }

         this._findBanner.show();
     }

     findBannerPerformSearch(findBanner, query)
     {
         var currentContentView = this.currentContentView;
         if (!currentContentView || !currentContentView.supportsSearch)
             return;

         currentContentView.performSearch(query);
     }

     findBannerSearchCleared(findBanner)
     {
         var currentContentView = this.currentContentView;
         if (!currentContentView || !currentContentView.supportsSearch)
             return;

         currentContentView.searchCleared();
     }

     findBannerSearchQueryForSelection(findBanner)
     {
         var currentContentView = this.currentContentView;
         if (!currentContentView || !currentContentView.supportsSearch)
             return null;

         return currentContentView.searchQueryWithSelection();
     }

     findBannerRevealPreviousResult(findBanner)
     {
         var currentContentView = this.currentContentView;
         if (!currentContentView || !currentContentView.supportsSearch)
             return;

         currentContentView.revealPreviousSearchResult(!findBanner.showing);
     }

     findBannerRevealNextResult(findBanner)
     {
         var currentContentView = this.currentContentView;
         if (!currentContentView || !currentContentView.supportsSearch)
             return;

         currentContentView.revealNextSearchResult(!findBanner.showing);
     }

     shown()
     {
         this._contentViewContainer.shown();

         if (this._findBanner)
             this._findBanner.enableKeyboardShortcuts();
     }

     hidden()
     {
         this._contentViewContainer.hidden();

         if (this._findBanner)
             this._findBanner.disableKeyboardShortcuts();
     }

     // Private

     _findBannerDidShow(event)
     {
         var currentContentView = this.currentContentView;
         if (!currentContentView || !currentContentView.supportsSearch)
             return;

         currentContentView.automaticallyRevealFirstSearchResult = true;
         if (this._findBanner.searchQuery !== "")
             currentContentView.performSearch(this._findBanner.searchQuery);
     }

     _findBannerDidHide(event)
     {
         var currentContentView = this.currentContentView;
         if (!currentContentView || !currentContentView.supportsSearch)
             return;

         currentContentView.automaticallyRevealFirstSearchResult = false;
         currentContentView.searchCleared();
     }

     _contentViewNumberOfSearchResultsDidChange(event)
     {
         if (!this._findBanner)
             return;

         if (event.target !== this.currentContentView)
             return;

         this._findBanner.numberOfResults = this.currentContentView.numberOfSearchResults;
     }

     _updateHierarchicalPathNavigationItem(representedObject)
     {
         if (!this.delegate || typeof this.delegate.contentBrowserTreeElementForRepresentedObject !== "function")
             return;

         var treeElement = representedObject ? this.delegate.contentBrowserTreeElementForRepresentedObject(this, representedObject) : null;
         var pathComponents = [];

         while (treeElement && !treeElement.root) {
             var pathComponent = new WebInspector.GeneralTreeElementPathComponent(treeElement);
             pathComponents.unshift(pathComponent);
             treeElement = treeElement.parent;
         }

         this._hierarchicalPathNavigationItem.components = pathComponents;
     }

     _updateContentViewSelectionPathNavigationItem(contentView)
     {
         var selectionPathComponents = contentView ? contentView.selectionPathComponents || [] : [];
         this._contentViewSelectionPathNavigationItem.components = selectionPathComponents;

         if (!selectionPathComponents.length) {
             this._hierarchicalPathNavigationItem.alwaysShowLastPathComponentSeparator = false;
             this._navigationBar.removeNavigationItem(this._contentViewSelectionPathNavigationItem);
             return;
         }

         // Insert the _contentViewSelectionPathNavigationItem after the _hierarchicalPathNavigationItem, if needed.
         if (!this._navigationBar.navigationItems.includes(this._contentViewSelectionPathNavigationItem)) {
             var hierarchicalPathItemIndex = this._navigationBar.navigationItems.indexOf(this._hierarchicalPathNavigationItem);
             console.assert(hierarchicalPathItemIndex !== -1);
             this._navigationBar.insertNavigationItem(this._contentViewSelectionPathNavigationItem, hierarchicalPathItemIndex + 1);
             this._hierarchicalPathNavigationItem.alwaysShowLastPathComponentSeparator = true;
         }
     }

     _updateBackForwardButtons()
     {
         if (!this._backNavigationItem || !this._forwardNavigationItem)
             return;

         this._backNavigationItem.enabled = this.canGoBack();
         this._forwardNavigationItem.enabled = this.canGoForward();
     }

     _updateContentViewNavigationItems()
     {
         var currentContentView = this.currentContentView;
         if (!currentContentView) {
             this._removeAllNavigationItems();
             this._currentContentViewNavigationItems = [];
             return;
         }

         let previousItems = this._currentContentViewNavigationItems.filter((item) => !(item instanceof WebInspector.DividerNavigationItem));
         let isUnchanged = Array.shallowEqual(previousItems, currentContentView.navigationItems);

         if (isUnchanged)
             return;

         this._removeAllNavigationItems();

         let navigationBar = this.navigationBar;
         let insertionIndex = navigationBar.navigationItems.indexOf(this._dividingFlexibleSpaceNavigationItem) + 1;
         console.assert(insertionIndex >= 0);

         // Keep track of items we'll be adding to the navigation bar.
         let newNavigationItems = [];

         // Go through each of the items of the new content view and add a divider before them.
         currentContentView.navigationItems.forEach(function(navigationItem, index) {
             // Add dividers before items unless it's the first item and not a button.
             if (index !== 0 || navigationItem instanceof WebInspector.ButtonNavigationItem) {
                 let divider = new WebInspector.DividerNavigationItem;
                 navigationBar.insertNavigationItem(divider, insertionIndex++);
                 newNavigationItems.push(divider);
             }
             navigationBar.insertNavigationItem(navigationItem, insertionIndex++);
             newNavigationItems.push(navigationItem);
         });

         // Remember the navigation items we inserted so we can remove them
         // for the next content view.
         this._currentContentViewNavigationItems = newNavigationItems;
     }

     _removeAllNavigationItems()
     {
         for (let navigationItem of this._currentContentViewNavigationItems)
             this.navigationBar.removeNavigationItem(navigationItem);
     }

     _updateFindBanner(currentContentView)
     {
         if (!this._findBanner)
             return;

         if (!currentContentView) {
             this._findBanner.targetElement = null;
             this._findBanner.numberOfResults = null;
             return;
         }

         this._findBanner.targetElement = currentContentView.element;
         this._findBanner.numberOfResults = currentContentView.hasPerformedSearch ? currentContentView.numberOfSearchResults : null;

         if (currentContentView.supportsSearch && this._findBanner.searchQuery) {
             currentContentView.automaticallyRevealFirstSearchResult = this._findBanner.showing;
             currentContentView.performSearch(this._findBanner.searchQuery);
         }
     }

     _dispatchCurrentRepresentedObjectsDidChangeEvent()
     {
         this._dispatchCurrentRepresentedObjectsDidChangeEvent.cancelDebounce();

         this.dispatchEventToListeners(WebInspector.ContentBrowser.Event.CurrentRepresentedObjectsDidChange);
     }

     _contentViewSelectionPathComponentDidChange(event)
     {
         if (event.target !== this.currentContentView)
             return;

         this._updateContentViewSelectionPathNavigationItem(event.target);
         this._updateBackForwardButtons();

         this._updateContentViewNavigationItems();

         this._navigationBar.needsLayout();

         this.soon._dispatchCurrentRepresentedObjectsDidChangeEvent();
     }

     _contentViewSupplementalRepresentedObjectsDidChange(event)
     {
         if (event.target !== this.currentContentView)
             return;

         this.soon._dispatchCurrentRepresentedObjectsDidChangeEvent();
     }

     _currentContentViewDidChange(event)
     {
         var currentContentView = this.currentContentView;

         this._updateHierarchicalPathNavigationItem(currentContentView ? currentContentView.representedObject : null);
         this._updateContentViewSelectionPathNavigationItem(currentContentView);
         this._updateBackForwardButtons();

         this._updateContentViewNavigationItems();
         this._updateFindBanner(currentContentView);

         this._navigationBar.needsLayout();

         this.dispatchEventToListeners(WebInspector.ContentBrowser.Event.CurrentContentViewDidChange);

         this._dispatchCurrentRepresentedObjectsDidChangeEvent();
     }

     _contentViewNavigationItemsDidChange(event)
     {
         if (event.target !== this.currentContentView)
             return;

         this._updateContentViewNavigationItems();
         this._navigationBar.needsLayout();
     }

     _hierarchicalPathComponentWasSelected(event)
     {
         console.assert(event.data.pathComponent instanceof WebInspector.GeneralTreeElementPathComponent);

         var treeElement = event.data.pathComponent.generalTreeElement;
         var originalTreeElement = treeElement;

         // Some tree elements (like folders) are not viewable. Find the first descendant that is viewable.
         while (treeElement && !WebInspector.ContentView.isViewable(treeElement.representedObject))
             treeElement = treeElement.traverseNextTreeElement(false, originalTreeElement, false);

         if (!treeElement)
             return;

         treeElement.revealAndSelect();
     }
 };

 WebInspector.ContentBrowser.Event = {
     CurrentRepresentedObjectsDidChange: "content-browser-current-represented-objects-did-change",
     CurrentContentViewDidChange: "content-browser-current-content-view-did-change"
 };
	/*
	* Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	WebInspector.ContentBrowser = class ContentBrowser extends WebInspector.View
	{
	constructor(element, delegate, disableBackForward, disableFindBanner)
	{
	super(element);

	this.element.classList.add("content-browser");

	this._navigationBar = new WebInspector.NavigationBar;
	this.addSubview(this._navigationBar);

	this._contentViewContainer = new WebInspector.ContentViewContainer;
	this._contentViewContainer.addEventListener(WebInspector.ContentViewContainer.Event.CurrentContentViewDidChange, this._currentContentViewDidChange, this);
	this.addSubview(this._contentViewContainer);

	if (!disableBackForward) {
	let isRTL = WebInspector.resolvedLayoutDirection() === WebInspector.LayoutDirection.RTL;

	let goBack = () => { this.goBack(); };
	let goForward = () => { this.goForward(); };

	let backShortcutKey = isRTL ? WebInspector.KeyboardShortcut.Key.Right : WebInspector.KeyboardShortcut.Key.Left;
	let forwardShortcutKey = isRTL ? WebInspector.KeyboardShortcut.Key.Left : WebInspector.KeyboardShortcut.Key.Right;
	this._backKeyboardShortcut = new WebInspector.KeyboardShortcut(WebInspector.KeyboardShortcut.Modifier.CommandOrControl \| WebInspector.KeyboardShortcut.Modifier.Control, backShortcutKey, goBack, this.element);
	this._forwardKeyboardShortcut = new WebInspector.KeyboardShortcut(WebInspector.KeyboardShortcut.Modifier.CommandOrControl \| WebInspector.KeyboardShortcut.Modifier.Control, forwardShortcutKey, goForward, this.element);

	let leftArrow = "Images/BackForwardArrows.svg#left-arrow-mask";
	let rightArrow = "Images/BackForwardArrows.svg#right-arrow-mask";
	let backButtonImage = isRTL ? rightArrow : leftArrow;
	let forwardButtonImage = isRTL ? leftArrow : rightArrow;

	this._backNavigationItem = new WebInspector.ButtonNavigationItem("back", WebInspector.UIString("Back (%s)").format(this._backKeyboardShortcut.displayName), backButtonImage, 8, 13);
	this._backNavigationItem.addEventListener(WebInspector.ButtonNavigationItem.Event.Clicked, goBack);
	this._backNavigationItem.enabled = false;
	this._navigationBar.addNavigationItem(this._backNavigationItem);

	this._forwardNavigationItem = new WebInspector.ButtonNavigationItem("forward", WebInspector.UIString("Forward (%s)").format(this._forwardKeyboardShortcut.displayName), forwardButtonImage, 8, 13);
	this._forwardNavigationItem.addEventListener(WebInspector.ButtonNavigationItem.Event.Clicked, goForward);
	this._forwardNavigationItem.enabled = false;
	this._navigationBar.addNavigationItem(this._forwardNavigationItem);

	this._navigationBar.addNavigationItem(new WebInspector.DividerNavigationItem);
	}

	if (!disableFindBanner) {
	this._findBanner = new WebInspector.FindBanner(this);
	this._findBanner.addEventListener(WebInspector.FindBanner.Event.DidShow, this._findBannerDidShow, this);
	this._findBanner.addEventListener(WebInspector.FindBanner.Event.DidHide, this._findBannerDidHide, this);
	}

	this._hierarchicalPathNavigationItem = new WebInspector.HierarchicalPathNavigationItem;
	this._hierarchicalPathNavigationItem.addEventListener(WebInspector.HierarchicalPathNavigationItem.Event.PathComponentWasSelected, this._hierarchicalPathComponentWasSelected, this);
	this._navigationBar.addNavigationItem(this._hierarchicalPathNavigationItem);

	this._contentViewSelectionPathNavigationItem = new WebInspector.HierarchicalPathNavigationItem;

	this._dividingFlexibleSpaceNavigationItem = new WebInspector.FlexibleSpaceNavigationItem;
	this._navigationBar.addNavigationItem(this._dividingFlexibleSpaceNavigationItem);

	WebInspector.ContentView.addEventListener(WebInspector.ContentView.Event.SelectionPathComponentsDidChange, this._contentViewSelectionPathComponentDidChange, this);
	WebInspector.ContentView.addEventListener(WebInspector.ContentView.Event.SupplementalRepresentedObjectsDidChange, this._contentViewSupplementalRepresentedObjectsDidChange, this);
	WebInspector.ContentView.addEventListener(WebInspector.ContentView.Event.NumberOfSearchResultsDidChange, this._contentViewNumberOfSearchResultsDidChange, this);
	WebInspector.ContentView.addEventListener(WebInspector.ContentView.Event.NavigationItemsDidChange, this._contentViewNavigationItemsDidChange, this);

	this._delegate = delegate \|\| null;

	this._currentContentViewNavigationItems = [];
	}

	// Public

	get navigationBar()
	{
	return this._navigationBar;
	}

	get contentViewContainer()
	{
	return this._contentViewContainer;
	}

	get delegate()
	{
	return this._delegate;
	}

	set delegate(newDelegate)
	{
	this._delegate = newDelegate \|\| null;
	}

	get currentContentView()
	{
	return this._contentViewContainer.currentContentView;
	}

	get currentRepresentedObjects()
	{
	var representedObjects = [];

	var lastComponent = this._hierarchicalPathNavigationItem.lastComponent;
	if (lastComponent && lastComponent.representedObject)
	representedObjects.push(lastComponent.representedObject);

	lastComponent = this._contentViewSelectionPathNavigationItem.lastComponent;
	if (lastComponent && lastComponent.representedObject)
	representedObjects.push(lastComponent.representedObject);

	var currentContentView = this.currentContentView;
	if (currentContentView) {
	var supplementalRepresentedObjects = currentContentView.supplementalRepresentedObjects;
	if (supplementalRepresentedObjects && supplementalRepresentedObjects.length)
	representedObjects = representedObjects.concat(supplementalRepresentedObjects);
	}

	return representedObjects;
	}

	showContentViewForRepresentedObject(representedObject, cookie, extraArguments)
	{
	var contentView = this.contentViewForRepresentedObject(representedObject, false, extraArguments);
	return this._contentViewContainer.showContentView(contentView, cookie);
	}

	showContentView(contentView, cookie)
	{
	return this._contentViewContainer.showContentView(contentView, cookie);
	}

	contentViewForRepresentedObject(representedObject, onlyExisting, extraArguments)
	{
	return this._contentViewContainer.contentViewForRepresentedObject(representedObject, onlyExisting, extraArguments);
	}

	updateHierarchicalPathForCurrentContentView()
	{
	var currentContentView = this.currentContentView;
	this._updateHierarchicalPathNavigationItem(currentContentView ? currentContentView.representedObject : null);
	}

	canGoBack()
	{
	var currentContentView = this.currentContentView;
	if (currentContentView && currentContentView.canGoBack())
	return true;
	return this._contentViewContainer.canGoBack();
	}

	canGoForward()
	{
	var currentContentView = this.currentContentView;
	if (currentContentView && currentContentView.canGoForward())
	return true;
	return this._contentViewContainer.canGoForward();
	}

	goBack()
	{
	var currentContentView = this.currentContentView;
	if (currentContentView && currentContentView.canGoBack()) {
	currentContentView.goBack();
	this._updateBackForwardButtons();
	return;
	}

	this._contentViewContainer.goBack();

	// The _updateBackForwardButtons function is called by _currentContentViewDidChange,
	// so it does not need to be called here.
	}

	goForward()
	{
	var currentContentView = this.currentContentView;
	if (currentContentView && currentContentView.canGoForward()) {
	currentContentView.goForward();
	this._updateBackForwardButtons();
	return;
	}

	this._contentViewContainer.goForward();

	// The _updateBackForwardButtons function is called by _currentContentViewDidChange,
	// so it does not need to be called here.
	}

	showFindBanner()
	{
	if (!this._findBanner)
	return;

	var currentContentView = this.currentContentView;
	if (!currentContentView \|\| !currentContentView.supportsSearch)
	return;

	if (currentContentView.supportsCustomFindBanner) {
	currentContentView.showCustomFindBanner();
	return;
	}

	this._findBanner.show();
	}

	findBannerPerformSearch(findBanner, query)
	{
	var currentContentView = this.currentContentView;
	if (!currentContentView \|\| !currentContentView.supportsSearch)
	return;

	currentContentView.performSearch(query);
	}

	findBannerSearchCleared(findBanner)
	{
	var currentContentView = this.currentContentView;
	if (!currentContentView \|\| !currentContentView.supportsSearch)
	return;

	currentContentView.searchCleared();
	}

	findBannerSearchQueryForSelection(findBanner)
	{
	var currentContentView = this.currentContentView;
	if (!currentContentView \|\| !currentContentView.supportsSearch)
	return null;

	return currentContentView.searchQueryWithSelection();
	}

	findBannerRevealPreviousResult(findBanner)
	{
	var currentContentView = this.currentContentView;
	if (!currentContentView \|\| !currentContentView.supportsSearch)
	return;

	currentContentView.revealPreviousSearchResult(!findBanner.showing);
	}

	findBannerRevealNextResult(findBanner)
	{
	var currentContentView = this.currentContentView;
	if (!currentContentView \|\| !currentContentView.supportsSearch)
	return;

	currentContentView.revealNextSearchResult(!findBanner.showing);
	}

	shown()
	{
	this._contentViewContainer.shown();

	if (this._findBanner)
	this._findBanner.enableKeyboardShortcuts();
	}

	hidden()
	{
	this._contentViewContainer.hidden();

	if (this._findBanner)
	this._findBanner.disableKeyboardShortcuts();
	}

	// Private

	_findBannerDidShow(event)
	{
	var currentContentView = this.currentContentView;
	if (!currentContentView \|\| !currentContentView.supportsSearch)
	return;

	currentContentView.automaticallyRevealFirstSearchResult = true;
	if (this._findBanner.searchQuery !== "")
	currentContentView.performSearch(this._findBanner.searchQuery);
	}

	_findBannerDidHide(event)
	{
	var currentContentView = this.currentContentView;
	if (!currentContentView \|\| !currentContentView.supportsSearch)
	return;

	currentContentView.automaticallyRevealFirstSearchResult = false;
	currentContentView.searchCleared();
	}

	_contentViewNumberOfSearchResultsDidChange(event)
	{
	if (!this._findBanner)
	return;

	if (event.target !== this.currentContentView)
	return;

	this._findBanner.numberOfResults = this.currentContentView.numberOfSearchResults;
	}

	_updateHierarchicalPathNavigationItem(representedObject)
	{
	if (!this.delegate \|\| typeof this.delegate.contentBrowserTreeElementForRepresentedObject !== "function")
	return;

	var treeElement = representedObject ? this.delegate.contentBrowserTreeElementForRepresentedObject(this, representedObject) : null;
	var pathComponents = [];

	while (treeElement && !treeElement.root) {
	var pathComponent = new WebInspector.GeneralTreeElementPathComponent(treeElement);
	pathComponents.unshift(pathComponent);
	treeElement = treeElement.parent;
	}

	this._hierarchicalPathNavigationItem.components = pathComponents;
	}

	_updateContentViewSelectionPathNavigationItem(contentView)
	{
	var selectionPathComponents = contentView ? contentView.selectionPathComponents \|\| [] : [];
	this._contentViewSelectionPathNavigationItem.components = selectionPathComponents;

	if (!selectionPathComponents.length) {
	this._hierarchicalPathNavigationItem.alwaysShowLastPathComponentSeparator = false;
	this._navigationBar.removeNavigationItem(this._contentViewSelectionPathNavigationItem);
	return;
	}

	// Insert the _contentViewSelectionPathNavigationItem after the _hierarchicalPathNavigationItem, if needed.
	if (!this._navigationBar.navigationItems.includes(this._contentViewSelectionPathNavigationItem)) {
	var hierarchicalPathItemIndex = this._navigationBar.navigationItems.indexOf(this._hierarchicalPathNavigationItem);
	console.assert(hierarchicalPathItemIndex !== -1);
	this._navigationBar.insertNavigationItem(this._contentViewSelectionPathNavigationItem, hierarchicalPathItemIndex + 1);
	this._hierarchicalPathNavigationItem.alwaysShowLastPathComponentSeparator = true;
	}
	}

	_updateBackForwardButtons()
	{
	if (!this._backNavigationItem \|\| !this._forwardNavigationItem)
	return;

	this._backNavigationItem.enabled = this.canGoBack();
	this._forwardNavigationItem.enabled = this.canGoForward();
	}

	_updateContentViewNavigationItems()
	{
	var currentContentView = this.currentContentView;
	if (!currentContentView) {
	this._removeAllNavigationItems();
	this._currentContentViewNavigationItems = [];
	return;
	}

	let previousItems = this._currentContentViewNavigationItems.filter((item) => !(item instanceof WebInspector.DividerNavigationItem));
	let isUnchanged = Array.shallowEqual(previousItems, currentContentView.navigationItems);

	if (isUnchanged)
	return;

	this._removeAllNavigationItems();

	let navigationBar = this.navigationBar;
	let insertionIndex = navigationBar.navigationItems.indexOf(this._dividingFlexibleSpaceNavigationItem) + 1;
	console.assert(insertionIndex >= 0);

	// Keep track of items we'll be adding to the navigation bar.
	let newNavigationItems = [];

	// Go through each of the items of the new content view and add a divider before them.
	currentContentView.navigationItems.forEach(function(navigationItem, index) {
	// Add dividers before items unless it's the first item and not a button.
	if (index !== 0 \|\| navigationItem instanceof WebInspector.ButtonNavigationItem) {
	let divider = new WebInspector.DividerNavigationItem;
	navigationBar.insertNavigationItem(divider, insertionIndex++);
	newNavigationItems.push(divider);
	}
	navigationBar.insertNavigationItem(navigationItem, insertionIndex++);
	newNavigationItems.push(navigationItem);
	});

	// Remember the navigation items we inserted so we can remove them
	// for the next content view.
	this._currentContentViewNavigationItems = newNavigationItems;
	}

	_removeAllNavigationItems()
	{
	for (let navigationItem of this._currentContentViewNavigationItems)
	this.navigationBar.removeNavigationItem(navigationItem);
	}

	_updateFindBanner(currentContentView)
	{
	if (!this._findBanner)
	return;

	if (!currentContentView) {
	this._findBanner.targetElement = null;
	this._findBanner.numberOfResults = null;
	return;
	}

	this._findBanner.targetElement = currentContentView.element;
	this._findBanner.numberOfResults = currentContentView.hasPerformedSearch ? currentContentView.numberOfSearchResults : null;

	if (currentContentView.supportsSearch && this._findBanner.searchQuery) {
	currentContentView.automaticallyRevealFirstSearchResult = this._findBanner.showing;
	currentContentView.performSearch(this._findBanner.searchQuery);
	}
	}

	_dispatchCurrentRepresentedObjectsDidChangeEvent()
	{
	this._dispatchCurrentRepresentedObjectsDidChangeEvent.cancelDebounce();

	this.dispatchEventToListeners(WebInspector.ContentBrowser.Event.CurrentRepresentedObjectsDidChange);
	}

	_contentViewSelectionPathComponentDidChange(event)
	{
	if (event.target !== this.currentContentView)
	return;

	this._updateContentViewSelectionPathNavigationItem(event.target);
	this._updateBackForwardButtons();

	this._updateContentViewNavigationItems();

	this._navigationBar.needsLayout();

	this.soon._dispatchCurrentRepresentedObjectsDidChangeEvent();
	}

	_contentViewSupplementalRepresentedObjectsDidChange(event)
	{
	if (event.target !== this.currentContentView)
	return;

	this.soon._dispatchCurrentRepresentedObjectsDidChangeEvent();
	}

	_currentContentViewDidChange(event)
	{
	var currentContentView = this.currentContentView;

	this._updateHierarchicalPathNavigationItem(currentContentView ? currentContentView.representedObject : null);
	this._updateContentViewSelectionPathNavigationItem(currentContentView);
	this._updateBackForwardButtons();

	this._updateContentViewNavigationItems();
	this._updateFindBanner(currentContentView);

	this._navigationBar.needsLayout();

	this.dispatchEventToListeners(WebInspector.ContentBrowser.Event.CurrentContentViewDidChange);

	this._dispatchCurrentRepresentedObjectsDidChangeEvent();
	}

	_contentViewNavigationItemsDidChange(event)
	{
	if (event.target !== this.currentContentView)
	return;

	this._updateContentViewNavigationItems();
	this._navigationBar.needsLayout();
	}

	_hierarchicalPathComponentWasSelected(event)
	{
	console.assert(event.data.pathComponent instanceof WebInspector.GeneralTreeElementPathComponent);

	var treeElement = event.data.pathComponent.generalTreeElement;
	var originalTreeElement = treeElement;

	// Some tree elements (like folders) are not viewable. Find the first descendant that is viewable.
	while (treeElement && !WebInspector.ContentView.isViewable(treeElement.representedObject))
	treeElement = treeElement.traverseNextTreeElement(false, originalTreeElement, false);

	if (!treeElement)
	return;

	treeElement.revealAndSelect();
	}
	};

	WebInspector.ContentBrowser.Event = {
	CurrentRepresentedObjectsDidChange: "content-browser-current-represented-objects-did-change",
	CurrentContentViewDidChange: "content-browser-current-content-view-did-change"
	};