src/cobalt/debug/remote/devtools/front_end/audits/AuditsPanel.js - cobalt - Git at Google

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 /**
  * @unrestricted
  */
 export default class AuditsPanel extends UI.Panel {
   constructor() {
     super('audits');
     this.registerRequiredCSS('audits/lighthouse/report.css');
     this.registerRequiredCSS('audits/auditsPanel.css');

     this._protocolService = new Audits.ProtocolService();
     this._controller = new Audits.AuditController(this._protocolService);
     this._startView = new Audits.StartView(this._controller);
     this._statusView = new Audits.StatusView(this._controller);

     this._unauditableExplanation = null;
     this._cachedRenderedReports = new Map();

     this._dropTarget = new UI.DropTarget(
         this.contentElement, [UI.DropTarget.Type.File], Common.UIString('Drop audit file here'),
         this._handleDrop.bind(this));

     this._controller.addEventListener(Audits.Events.PageAuditabilityChanged, this._refreshStartAuditUI.bind(this));
     this._controller.addEventListener(Audits.Events.AuditProgressChanged, this._refreshStatusUI.bind(this));
     this._controller.addEventListener(Audits.Events.RequestAuditStart, this._startAudit.bind(this));
     this._controller.addEventListener(Audits.Events.RequestAuditCancel, this._cancelAudit.bind(this));

     this._renderToolbar();
     this._auditResultsElement = this.contentElement.createChild('div', 'audits-results-container');
     this._renderStartView();

     this._controller.recomputePageAuditability();
   }

   /**
    * @param {!Common.Event} evt
    */
   _refreshStartAuditUI(evt) {
     // PageAuditabilityChanged fires multiple times during an audit, which we want to ignore.
     if (this._isLHAttached) {
       return;
     }

     this._unauditableExplanation = evt.data.helpText;
     this._startView.setUnauditableExplanation(evt.data.helpText);
     this._startView.setStartButtonEnabled(!evt.data.helpText);
   }

   /**
    * @param {!Common.Event} evt
    */
   _refreshStatusUI(evt) {
     this._statusView.updateStatus(evt.data.message);
   }

   _refreshToolbarUI() {
     this._clearButton.setEnabled(this._reportSelector.hasItems());
   }

   _clearAll() {
     this._reportSelector.clearAll();
     this._renderStartView();
     this._refreshToolbarUI();
   }

   _renderToolbar() {
     const auditsToolbarContainer = this.element.createChild('div', 'audits-toolbar-container');

     const toolbar = new UI.Toolbar('', auditsToolbarContainer);

     this._newButton = new UI.ToolbarButton(Common.UIString('Perform an audit\u2026'), 'largeicon-add');
     toolbar.appendToolbarItem(this._newButton);
     this._newButton.addEventListener(UI.ToolbarButton.Events.Click, this._renderStartView.bind(this));

     toolbar.appendSeparator();

     this._reportSelector = new Audits.ReportSelector(() => this._renderStartView());
     toolbar.appendToolbarItem(this._reportSelector.comboBox());

     this._clearButton = new UI.ToolbarButton(Common.UIString('Clear all'), 'largeicon-clear');
     toolbar.appendToolbarItem(this._clearButton);
     this._clearButton.addEventListener(UI.ToolbarButton.Events.Click, this._clearAll.bind(this));

     this._settingsPane = new UI.HBox();
     this._settingsPane.show(this.contentElement);
     this._settingsPane.element.classList.add('audits-settings-pane');
     this._settingsPane.element.appendChild(this._startView.settingsToolbar().element);
     this._showSettingsPaneSetting = Common.settings.createSetting('auditsShowSettingsToolbar', false);

     this._rightToolbar = new UI.Toolbar('', auditsToolbarContainer);
     this._rightToolbar.appendSeparator();
     this._rightToolbar.appendToolbarItem(
         new UI.ToolbarSettingToggle(this._showSettingsPaneSetting, 'largeicon-settings-gear', ls`Audits settings`));
     this._showSettingsPaneSetting.addChangeListener(this._updateSettingsPaneVisibility.bind(this));
     this._updateSettingsPaneVisibility();

     this._refreshToolbarUI();
   }

   _updateSettingsPaneVisibility() {
     this._settingsPane.element.classList.toggle('hidden', !this._showSettingsPaneSetting.get());
   }

   /**
    * @param {boolean} show
    */
   _toggleSettingsDisplay(show) {
     this._rightToolbar.element.classList.toggle('hidden', !show);
     this._settingsPane.element.classList.toggle('hidden', !show);
     this._updateSettingsPaneVisibility();
   }

   _renderStartView() {
     this._auditResultsElement.removeChildren();
     this._statusView.hide();

     this._reportSelector.selectNewAudit();
     this.contentElement.classList.toggle('in-progress', false);

     this._startView.show(this.contentElement);
     this._toggleSettingsDisplay(true);
     this._startView.setUnauditableExplanation(this._unauditableExplanation);
     this._startView.setStartButtonEnabled(!this._unauditableExplanation);
     if (!this._unauditableExplanation) {
       this._startView.focusStartButton();
     }

     this._newButton.setEnabled(false);
     this._refreshToolbarUI();
     this.setDefaultFocusedChild(this._startView);
   }

   /**
    * @param {string} inspectedURL
    */
   _renderStatusView(inspectedURL) {
     this.contentElement.classList.toggle('in-progress', true);
     this._statusView.setInspectedURL(inspectedURL);
     this._statusView.show(this.contentElement);
   }

   _beforePrint() {
     this._statusView.show(this.contentElement);
     this._statusView.toggleCancelButton(false);
     this._statusView.renderText(ls`Printing`, ls`The print popup window is open. Please close it to continue.`);
   }

   _afterPrint() {
     this._statusView.hide();
     this._statusView.toggleCancelButton(true);
   }

   /**
    * @param {!ReportRenderer.ReportJSON} lighthouseResult
    * @param {!ReportRenderer.RunnerResultArtifacts=} artifacts
    */
   _renderReport(lighthouseResult, artifacts) {
     this._toggleSettingsDisplay(false);
     this.contentElement.classList.toggle('in-progress', false);
     this._startView.hideWidget();
     this._statusView.hide();
     this._auditResultsElement.removeChildren();
     this._newButton.setEnabled(true);
     this._refreshToolbarUI();

     const cachedRenderedReport = this._cachedRenderedReports.get(lighthouseResult);
     if (cachedRenderedReport) {
       this._auditResultsElement.appendChild(cachedRenderedReport);
       return;
     }

     const reportContainer = this._auditResultsElement.createChild('div', 'lh-vars lh-root lh-devtools');

     const dom = new DOM(/** @type {!Document} */ (this._auditResultsElement.ownerDocument));
     const renderer = new Audits.ReportRenderer(dom);

     const templatesHTML = Root.Runtime.cachedResources['audits/lighthouse/templates.html'];
     const templatesDOM = new DOMParser().parseFromString(templatesHTML, 'text/html');
     if (!templatesDOM) {
       return;
     }

     renderer.setTemplateContext(templatesDOM);
     const el = renderer.renderReport(lighthouseResult, reportContainer);
     Audits.ReportRenderer.addViewTraceButton(el, artifacts);
     // Linkifying requires the target be loaded. Do not block the report
     // from rendering, as this is just an embellishment and the main target
     // could take awhile to load.
     this._waitForMainTargetLoad().then(() => {
       Audits.ReportRenderer.linkifyNodeDetails(el);
       Audits.ReportRenderer.linkifySourceLocationDetails(el);
     });
     Audits.ReportRenderer.handleDarkMode(el);

     const features = new Audits.ReportUIFeatures(dom);
     features.setBeforePrint(this._beforePrint.bind(this));
     features.setAfterPrint(this._afterPrint.bind(this));
     features.setTemplateContext(templatesDOM);
     features.initFeatures(lighthouseResult);

     this._cachedRenderedReports.set(lighthouseResult, reportContainer);
   }

   _waitForMainTargetLoad() {
     const mainTarget = SDK.targetManager.mainTarget();
     const resourceTreeModel = mainTarget.model(SDK.ResourceTreeModel);
     return resourceTreeModel.once(SDK.ResourceTreeModel.Events.Load);
   }

   /**
    * @param {!ReportRenderer.ReportJSON} lighthouseResult
    * @param {!ReportRenderer.RunnerResultArtifacts=} artifacts
    */
   _buildReportUI(lighthouseResult, artifacts) {
     if (lighthouseResult === null) {
       return;
     }

     const optionElement = new Audits.ReportSelector.Item(
         lighthouseResult, () => this._renderReport(lighthouseResult, artifacts), this._renderStartView.bind(this));
     this._reportSelector.prepend(optionElement);
     this._refreshToolbarUI();
     this._renderReport(lighthouseResult);
   }

   /**
    * @param {!DataTransfer} dataTransfer
    */
   _handleDrop(dataTransfer) {
     const items = dataTransfer.items;
     if (!items.length) {
       return;
     }
     const item = items[0];
     if (item.kind === 'file') {
       const entry = items[0].webkitGetAsEntry();
       if (!entry.isFile) {
         return;
       }
       entry.file(file => {
         const reader = new FileReader();
         reader.onload = () => this._loadedFromFile(/** @type {string} */ (reader.result));
         reader.readAsText(file);
       });
     }
   }

   /**
    * @param {string} report
    */
   _loadedFromFile(report) {
     const data = JSON.parse(report);
     if (!data['lighthouseVersion']) {
       return;
     }
     this._buildReportUI(/** @type {!ReportRenderer.ReportJSON} */ (data));
   }

   async _startAudit() {
     Host.userMetrics.actionTaken(Host.UserMetrics.Action.AuditsStarted);

     try {
       const inspectedURL = await this._controller.getInspectedURL({force: true});
       const categoryIDs = this._controller.getCategoryIDs();
       const flags = this._controller.getFlags();

       await this._setupEmulationAndProtocolConnection();

       this._renderStatusView(inspectedURL);

       const lighthouseResponse = await this._protocolService.startLighthouse(inspectedURL, categoryIDs, flags);

       if (lighthouseResponse && lighthouseResponse.fatal) {
         const error = new Error(lighthouseResponse.message);
         error.stack = lighthouseResponse.stack;
         throw error;
       }

       if (!lighthouseResponse) {
         throw new Error('Auditing failed to produce a result');
       }

       Host.userMetrics.actionTaken(Host.UserMetrics.Action.AuditsFinished);

       await this._resetEmulationAndProtocolConnection();
       this._buildReportUI(lighthouseResponse.lhr, lighthouseResponse.artifacts);
     } catch (err) {
       await this._resetEmulationAndProtocolConnection();
       if (err instanceof Error) {
         this._statusView.renderBugReport(err);
       }
     }
   }

   async _cancelAudit() {
     this._statusView.updateStatus(ls`Cancelling`);
     await this._resetEmulationAndProtocolConnection();
     this._renderStartView();
   }

   /**
    * We set the device emulation on the DevTools-side for two reasons:
    * 1. To workaround some odd device metrics emulation bugs like occuluding viewports
    * 2. To get the attractive device outline
    *
    * We also set flags.internalDisableDeviceScreenEmulation = true to let LH only apply UA emulation
    */
   async _setupEmulationAndProtocolConnection() {
     const flags = this._controller.getFlags();

     const emulationModel = self.singleton(Emulation.DeviceModeModel);
     this._stateBefore = {
       emulation: {
         enabled: emulationModel.enabledSetting().get(),
         outlineEnabled: emulationModel.deviceOutlineSetting().get(),
         toolbarControlsEnabled: emulationModel.toolbarControlsEnabledSetting().get()
       },
       network: {conditions: SDK.multitargetNetworkManager.networkConditions()}
     };

     emulationModel.toolbarControlsEnabledSetting().set(false);
     if (flags.emulatedFormFactor === 'desktop') {
       emulationModel.enabledSetting().set(false);
       emulationModel.emulate(Emulation.DeviceModeModel.Type.None, null, null);
     } else if (flags.emulatedFormFactor === 'mobile') {
       emulationModel.enabledSetting().set(true);
       emulationModel.deviceOutlineSetting().set(true);

       for (const device of Emulation.EmulatedDevicesList.instance().standard()) {
         if (device.title === 'Nexus 5X') {
           emulationModel.emulate(Emulation.DeviceModeModel.Type.Device, device, device.modes[0], 1);
         }
       }
     }

     await this._protocolService.attach();
     this._isLHAttached = true;
   }

   async _resetEmulationAndProtocolConnection() {
     if (!this._isLHAttached) {
       return;
     }

     this._isLHAttached = false;
     await this._protocolService.detach();

     if (this._stateBefore) {
       const emulationModel = self.singleton(Emulation.DeviceModeModel);
       emulationModel.enabledSetting().set(this._stateBefore.emulation.enabled);
       emulationModel.deviceOutlineSetting().set(this._stateBefore.emulation.outlineEnabled);
       emulationModel.toolbarControlsEnabledSetting().set(this._stateBefore.emulation.toolbarControlsEnabled);
       SDK.multitargetNetworkManager.setNetworkConditions(this._stateBefore.network.conditions);
       delete this._stateBefore;
     }

     Emulation.InspectedPagePlaceholder.instance().update(true);

     const resourceTreeModel = SDK.targetManager.mainTarget().model(SDK.ResourceTreeModel);
     // reload to reset the page state
     const inspectedURL = await this._controller.getInspectedURL();
     await resourceTreeModel.navigate(inspectedURL);
   }
 }

 /* Legacy exported object */
 self.Audits = self.Audits || {};

 /* Legacy exported object */
 Audits = Audits || {};

 /**
  * @constructor
  */
 Audits.AuditsPanel = AuditsPanel;
	// Copyright 2016 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	/**
	* @unrestricted
	*/
	export default class AuditsPanel extends UI.Panel {
	constructor() {
	super('audits');
	this.registerRequiredCSS('audits/lighthouse/report.css');
	this.registerRequiredCSS('audits/auditsPanel.css');

	this._protocolService = new Audits.ProtocolService();
	this._controller = new Audits.AuditController(this._protocolService);
	this._startView = new Audits.StartView(this._controller);
	this._statusView = new Audits.StatusView(this._controller);

	this._unauditableExplanation = null;
	this._cachedRenderedReports = new Map();

	this._dropTarget = new UI.DropTarget(
	this.contentElement, [UI.DropTarget.Type.File], Common.UIString('Drop audit file here'),
	this._handleDrop.bind(this));

	this._controller.addEventListener(Audits.Events.PageAuditabilityChanged, this._refreshStartAuditUI.bind(this));
	this._controller.addEventListener(Audits.Events.AuditProgressChanged, this._refreshStatusUI.bind(this));
	this._controller.addEventListener(Audits.Events.RequestAuditStart, this._startAudit.bind(this));
	this._controller.addEventListener(Audits.Events.RequestAuditCancel, this._cancelAudit.bind(this));

	this._renderToolbar();
	this._auditResultsElement = this.contentElement.createChild('div', 'audits-results-container');
	this._renderStartView();

	this._controller.recomputePageAuditability();
	}

	/**
	* @param {!Common.Event} evt
	*/
	_refreshStartAuditUI(evt) {
	// PageAuditabilityChanged fires multiple times during an audit, which we want to ignore.
	if (this._isLHAttached) {
	return;
	}

	this._unauditableExplanation = evt.data.helpText;
	this._startView.setUnauditableExplanation(evt.data.helpText);
	this._startView.setStartButtonEnabled(!evt.data.helpText);
	}

	/**
	* @param {!Common.Event} evt
	*/
	_refreshStatusUI(evt) {
	this._statusView.updateStatus(evt.data.message);
	}

	_refreshToolbarUI() {
	this._clearButton.setEnabled(this._reportSelector.hasItems());
	}

	_clearAll() {
	this._reportSelector.clearAll();
	this._renderStartView();
	this._refreshToolbarUI();
	}

	_renderToolbar() {
	const auditsToolbarContainer = this.element.createChild('div', 'audits-toolbar-container');

	const toolbar = new UI.Toolbar('', auditsToolbarContainer);

	this._newButton = new UI.ToolbarButton(Common.UIString('Perform an audit\u2026'), 'largeicon-add');
	toolbar.appendToolbarItem(this._newButton);
	this._newButton.addEventListener(UI.ToolbarButton.Events.Click, this._renderStartView.bind(this));

	toolbar.appendSeparator();

	this._reportSelector = new Audits.ReportSelector(() => this._renderStartView());
	toolbar.appendToolbarItem(this._reportSelector.comboBox());

	this._clearButton = new UI.ToolbarButton(Common.UIString('Clear all'), 'largeicon-clear');
	toolbar.appendToolbarItem(this._clearButton);
	this._clearButton.addEventListener(UI.ToolbarButton.Events.Click, this._clearAll.bind(this));

	this._settingsPane = new UI.HBox();
	this._settingsPane.show(this.contentElement);
	this._settingsPane.element.classList.add('audits-settings-pane');
	this._settingsPane.element.appendChild(this._startView.settingsToolbar().element);
	this._showSettingsPaneSetting = Common.settings.createSetting('auditsShowSettingsToolbar', false);

	this._rightToolbar = new UI.Toolbar('', auditsToolbarContainer);
	this._rightToolbar.appendSeparator();
	this._rightToolbar.appendToolbarItem(
	new UI.ToolbarSettingToggle(this._showSettingsPaneSetting, 'largeicon-settings-gear', ls`Audits settings`));
	this._showSettingsPaneSetting.addChangeListener(this._updateSettingsPaneVisibility.bind(this));
	this._updateSettingsPaneVisibility();

	this._refreshToolbarUI();
	}

	_updateSettingsPaneVisibility() {
	this._settingsPane.element.classList.toggle('hidden', !this._showSettingsPaneSetting.get());
	}

	/**
	* @param {boolean} show
	*/
	_toggleSettingsDisplay(show) {
	this._rightToolbar.element.classList.toggle('hidden', !show);
	this._settingsPane.element.classList.toggle('hidden', !show);
	this._updateSettingsPaneVisibility();
	}

	_renderStartView() {
	this._auditResultsElement.removeChildren();
	this._statusView.hide();

	this._reportSelector.selectNewAudit();
	this.contentElement.classList.toggle('in-progress', false);

	this._startView.show(this.contentElement);
	this._toggleSettingsDisplay(true);
	this._startView.setUnauditableExplanation(this._unauditableExplanation);
	this._startView.setStartButtonEnabled(!this._unauditableExplanation);
	if (!this._unauditableExplanation) {
	this._startView.focusStartButton();
	}

	this._newButton.setEnabled(false);
	this._refreshToolbarUI();
	this.setDefaultFocusedChild(this._startView);
	}

	/**
	* @param {string} inspectedURL
	*/
	_renderStatusView(inspectedURL) {
	this.contentElement.classList.toggle('in-progress', true);
	this._statusView.setInspectedURL(inspectedURL);
	this._statusView.show(this.contentElement);
	}

	_beforePrint() {
	this._statusView.show(this.contentElement);
	this._statusView.toggleCancelButton(false);
	this._statusView.renderText(ls`Printing`, ls`The print popup window is open. Please close it to continue.`);
	}

	_afterPrint() {
	this._statusView.hide();
	this._statusView.toggleCancelButton(true);
	}

	/**
	* @param {!ReportRenderer.ReportJSON} lighthouseResult
	* @param {!ReportRenderer.RunnerResultArtifacts=} artifacts
	*/
	_renderReport(lighthouseResult, artifacts) {
	this._toggleSettingsDisplay(false);
	this.contentElement.classList.toggle('in-progress', false);
	this._startView.hideWidget();
	this._statusView.hide();
	this._auditResultsElement.removeChildren();
	this._newButton.setEnabled(true);
	this._refreshToolbarUI();

	const cachedRenderedReport = this._cachedRenderedReports.get(lighthouseResult);
	if (cachedRenderedReport) {
	this._auditResultsElement.appendChild(cachedRenderedReport);
	return;
	}

	const reportContainer = this._auditResultsElement.createChild('div', 'lh-vars lh-root lh-devtools');

	const dom = new DOM(/** @type {!Document} */ (this._auditResultsElement.ownerDocument));
	const renderer = new Audits.ReportRenderer(dom);

	const templatesHTML = Root.Runtime.cachedResources['audits/lighthouse/templates.html'];
	const templatesDOM = new DOMParser().parseFromString(templatesHTML, 'text/html');
	if (!templatesDOM) {
	return;
	}

	renderer.setTemplateContext(templatesDOM);
	const el = renderer.renderReport(lighthouseResult, reportContainer);
	Audits.ReportRenderer.addViewTraceButton(el, artifacts);
	// Linkifying requires the target be loaded. Do not block the report
	// from rendering, as this is just an embellishment and the main target
	// could take awhile to load.
	this._waitForMainTargetLoad().then(() => {
	Audits.ReportRenderer.linkifyNodeDetails(el);
	Audits.ReportRenderer.linkifySourceLocationDetails(el);
	});
	Audits.ReportRenderer.handleDarkMode(el);

	const features = new Audits.ReportUIFeatures(dom);
	features.setBeforePrint(this._beforePrint.bind(this));
	features.setAfterPrint(this._afterPrint.bind(this));
	features.setTemplateContext(templatesDOM);
	features.initFeatures(lighthouseResult);

	this._cachedRenderedReports.set(lighthouseResult, reportContainer);
	}

	_waitForMainTargetLoad() {
	const mainTarget = SDK.targetManager.mainTarget();
	const resourceTreeModel = mainTarget.model(SDK.ResourceTreeModel);
	return resourceTreeModel.once(SDK.ResourceTreeModel.Events.Load);
	}

	/**
	* @param {!ReportRenderer.ReportJSON} lighthouseResult
	* @param {!ReportRenderer.RunnerResultArtifacts=} artifacts
	*/
	_buildReportUI(lighthouseResult, artifacts) {
	if (lighthouseResult === null) {
	return;
	}

	const optionElement = new Audits.ReportSelector.Item(
	lighthouseResult, () => this._renderReport(lighthouseResult, artifacts), this._renderStartView.bind(this));
	this._reportSelector.prepend(optionElement);
	this._refreshToolbarUI();
	this._renderReport(lighthouseResult);
	}

	/**
	* @param {!DataTransfer} dataTransfer
	*/
	_handleDrop(dataTransfer) {
	const items = dataTransfer.items;
	if (!items.length) {
	return;
	}
	const item = items[0];
	if (item.kind === 'file') {
	const entry = items[0].webkitGetAsEntry();
	if (!entry.isFile) {
	return;
	}
	entry.file(file => {
	const reader = new FileReader();
	reader.onload = () => this._loadedFromFile(/** @type {string} */ (reader.result));
	reader.readAsText(file);
	});
	}
	}

	/**
	* @param {string} report
	*/
	_loadedFromFile(report) {
	const data = JSON.parse(report);
	if (!data['lighthouseVersion']) {
	return;
	}
	this._buildReportUI(/** @type {!ReportRenderer.ReportJSON} */ (data));
	}

	async _startAudit() {
	Host.userMetrics.actionTaken(Host.UserMetrics.Action.AuditsStarted);

	try {
	const inspectedURL = await this._controller.getInspectedURL({force: true});
	const categoryIDs = this._controller.getCategoryIDs();
	const flags = this._controller.getFlags();

	await this._setupEmulationAndProtocolConnection();

	this._renderStatusView(inspectedURL);

	const lighthouseResponse = await this._protocolService.startLighthouse(inspectedURL, categoryIDs, flags);

	if (lighthouseResponse && lighthouseResponse.fatal) {
	const error = new Error(lighthouseResponse.message);
	error.stack = lighthouseResponse.stack;
	throw error;
	}

	if (!lighthouseResponse) {
	throw new Error('Auditing failed to produce a result');
	}

	Host.userMetrics.actionTaken(Host.UserMetrics.Action.AuditsFinished);

	await this._resetEmulationAndProtocolConnection();
	this._buildReportUI(lighthouseResponse.lhr, lighthouseResponse.artifacts);
	} catch (err) {
	await this._resetEmulationAndProtocolConnection();
	if (err instanceof Error) {
	this._statusView.renderBugReport(err);
	}
	}
	}

	async _cancelAudit() {
	this._statusView.updateStatus(ls`Cancelling`);
	await this._resetEmulationAndProtocolConnection();
	this._renderStartView();
	}

	/**
	* We set the device emulation on the DevTools-side for two reasons:
	* 1. To workaround some odd device metrics emulation bugs like occuluding viewports
	* 2. To get the attractive device outline
	*
	* We also set flags.internalDisableDeviceScreenEmulation = true to let LH only apply UA emulation
	*/
	async _setupEmulationAndProtocolConnection() {
	const flags = this._controller.getFlags();

	const emulationModel = self.singleton(Emulation.DeviceModeModel);
	this._stateBefore = {
	emulation: {
	enabled: emulationModel.enabledSetting().get(),
	outlineEnabled: emulationModel.deviceOutlineSetting().get(),
	toolbarControlsEnabled: emulationModel.toolbarControlsEnabledSetting().get()
	},
	network: {conditions: SDK.multitargetNetworkManager.networkConditions()}
	};

	emulationModel.toolbarControlsEnabledSetting().set(false);
	if (flags.emulatedFormFactor === 'desktop') {
	emulationModel.enabledSetting().set(false);
	emulationModel.emulate(Emulation.DeviceModeModel.Type.None, null, null);
	} else if (flags.emulatedFormFactor === 'mobile') {
	emulationModel.enabledSetting().set(true);
	emulationModel.deviceOutlineSetting().set(true);

	for (const device of Emulation.EmulatedDevicesList.instance().standard()) {
	if (device.title === 'Nexus 5X') {
	emulationModel.emulate(Emulation.DeviceModeModel.Type.Device, device, device.modes[0], 1);
	}
	}
	}

	await this._protocolService.attach();
	this._isLHAttached = true;
	}

	async _resetEmulationAndProtocolConnection() {
	if (!this._isLHAttached) {
	return;
	}

	this._isLHAttached = false;
	await this._protocolService.detach();

	if (this._stateBefore) {
	const emulationModel = self.singleton(Emulation.DeviceModeModel);
	emulationModel.enabledSetting().set(this._stateBefore.emulation.enabled);
	emulationModel.deviceOutlineSetting().set(this._stateBefore.emulation.outlineEnabled);
	emulationModel.toolbarControlsEnabledSetting().set(this._stateBefore.emulation.toolbarControlsEnabled);
	SDK.multitargetNetworkManager.setNetworkConditions(this._stateBefore.network.conditions);
	delete this._stateBefore;
	}

	Emulation.InspectedPagePlaceholder.instance().update(true);

	const resourceTreeModel = SDK.targetManager.mainTarget().model(SDK.ResourceTreeModel);
	// reload to reset the page state
	const inspectedURL = await this._controller.getInspectedURL();
	await resourceTreeModel.navigate(inspectedURL);
	}
	}

	/* Legacy exported object */
	self.Audits = self.Audits \|\| {};

	/* Legacy exported object */
	Audits = Audits \|\| {};

	/**
	* @constructor
	*/
	Audits.AuditsPanel = AuditsPanel;