DevTools: Introduce Landing page for Timeline panel.

third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 65 matching lines @@
     this._captureNetworkSetting = Common.settings.createSetting('timelineCaptureNetwork', false);
     this._captureJSProfileSetting = Common.settings.createSetting('timelineEnableJSSampling', true);
     this._captureMemorySetting = Common.settings.createSetting('timelineCaptureMemory', false);
     this._captureLayersAndPicturesSetting = Common.settings.createSetting('timelineCaptureLayersAndPictures', false);
     this._captureFilmStripSetting = Common.settings.createSetting('timelineCaptureFilmStrip', false);
 
     this._markUnusedCSS = Common.settings.createSetting('timelineMarkUnusedCSS', false);
 
     this._panelToolbar = new UI.Toolbar('', this.element);
 
-    var timelinePane = new UI.VBox();
-    timelinePane.show(this.element);
-    var topPaneElement = timelinePane.element.createChild('div', 'hbox');
+    this._timelinePane = new UI.VBox();
+    this._timelinePane.show(this.element);
+    var topPaneElement = this._timelinePane.element.createChild('div', 'hbox');
     topPaneElement.id = 'timeline-overview-panel';
 
     // Create top overview component.
     this._overviewPane = new UI.TimelineOverviewPane('timeline');
     this._overviewPane.addEventListener(UI.TimelineOverviewPane.Events.WindowChanged, this._onWindowChanged.bind(this));
     this._overviewPane.show(topPaneElement);
-    this._statusPaneContainer = timelinePane.element.createChild('div', 'status-pane-container fill');
+    this._statusPaneContainer = this._timelinePane.element.createChild('div', 'status-pane-container fill');
 
     this._createFileSelector();
 
     SDK.targetManager.addEventListener(SDK.TargetManager.Events.PageReloadRequested, this._pageReloadRequested, this);
     SDK.targetManager.addEventListener(SDK.TargetManager.Events.Load, this._loadEventFired, this);
 
     // Create top level properties splitter.
     this._detailsSplitWidget = new UI.SplitWidget(false, true, 'timelinePanelDetailsSplitViewState');
     this._detailsSplitWidget.element.classList.add('timeline-details-split');
     this._detailsView = new Timeline.TimelineDetailsView(this._model, this._filters, this);
     this._detailsSplitWidget.installResizer(this._detailsView.headerElement());
     this._detailsSplitWidget.setSidebarWidget(this._detailsView);
 
     this._searchableView = new UI.SearchableView(this);
     this._searchableView.setMinimumSize(0, 100);
     this._searchableView.element.classList.add('searchable-view');
     this._detailsSplitWidget.setMainWidget(this._searchableView);
 
     this._stackView = new UI.StackView(false);
     this._stackView.element.classList.add('timeline-view-stack');
 
     this._stackView.show(this._searchableView.element);
     this._onModeChanged();
     this._recreateToolbarItems();
 
     this._captureNetworkSetting.addChangeListener(this._onNetworkChanged, this);
     this._captureMemorySetting.addChangeListener(this._onModeChanged, this);
     this._captureFilmStripSetting.addChangeListener(this._onModeChanged, this);
 
-    this._detailsSplitWidget.show(timelinePane.element);
+    this._detailsSplitWidget.show(this._timelinePane.element);
     this._detailsSplitWidget.hideSidebar();
     SDK.targetManager.addEventListener(SDK.TargetManager.Events.SuspendStateChanged, this._onSuspendStateChanged, this);
     this._showRecordingHelpMessage();
 
     /** @type {!SDK.TracingModel.Event}|undefined */
     this._selectedSearchResult;
     /** @type {!Array<!SDK.TracingModel.Event>}|undefined */
     this._searchResults;
   }
 
@@ skipping 267 matching lines @@
 
   _populateCPUThrottingCombobox() {
     var cpuThrottlingCombobox = this._cpuThrottlingCombobox;
     cpuThrottlingCombobox.removeOptions();
     var currentRate = this._cpuThrottlingManager.rate();
     var hasSelection = false;
     /**
      * @param {string} name
      * @param {number} value
      */
-    function addGroupingOption(name, value) {
+    function addOption(name, value) {
       var option = cpuThrottlingCombobox.createOption(name, '', String(value));
       cpuThrottlingCombobox.addOption(option);
       if (hasSelection || (value && value !== currentRate))
         return;
       cpuThrottlingCombobox.select(option);
       hasSelection = true;
     }
-    var predefinedRates = new Map([
-      [1, Common.UIString('No CPU throttling')], [2, Common.UIString('2\xD7 slowdown')],
-      [5, Common.UIString('5\xD7 slowdown')], [10, Common.UIString('10\xD7 slowdown')],
-      [20, Common.UIString('20\xD7 slowdown')]
-    ]);
-    for (var rate of predefinedRates)
-      addGroupingOption(rate[1], rate[0]);
+    addOption(Common.UIString('No CPU throttling'), 1);
+    for (const rate of [2, 5, 10, 20])
+      addOption(Common.UIString('%d\xD7 slowdown', rate), rate);
   }
 
   _prepareToLoadTimeline() {
     console.assert(this._state === Timeline.TimelinePanel.State.Idle);
     this._setState(Timeline.TimelinePanel.State.Loading);
   }
 
   _createFileSelector() {
     if (this._fileSelectorElement)
       this._fileSelectorElement.remove();
@@ skipping 188 matching lines @@
   }
 
   _toggleRecording() {
     if (this._state === Timeline.TimelinePanel.State.Idle)
       this._startRecording(true);
     else if (this._state === Timeline.TimelinePanel.State.Recording)
       this._stopRecording();
   }
 
   _clear() {
+    this._showRecordingHelpMessage();
+    this._detailsSplitWidget.hideSidebar();
+    this._reset();
+  }
+
+  _reset() {
     if (Runtime.experiments.isEnabled('timelineRuleUsageRecording') && this._markUnusedCSS.get())
       Components.CoverageProfile.instance().reset();
 
     Components.LineLevelProfile.instance().reset();
     this._tracingModel.reset();
     this._model.reset();
-    this._showRecordingHelpMessage();
 
     this.requestWindowTimes(0, Infinity);
     delete this._selection;
     this._frameModel.reset();
     this._filmStripModel.reset(this._tracingModel);
     this._overviewPane.reset();
-    for (var i = 0; i < this._currentViews.length; ++i)
-      this._currentViews[i].reset();
-    for (var i = 0; i < this._overviewControls.length; ++i)
-      this._overviewControls[i].reset();
+    this._currentViews.forEach(view => view.reset());
+    this._overviewControls.forEach(overview => overview.reset());
     this.select(null);
-    this._detailsSplitWidget.hideSidebar();
   }
 
   /**
    * @override
    */
   recordingStarted() {
-    this._clear();
+    this._reset();
     this._setState(Timeline.TimelinePanel.State.Recording);
     this._showRecordingStarted();
     this._statusPane.updateStatus(Common.UIString('Recording\u2026'));
     this._statusPane.updateProgressBar(Common.UIString('Buffer usage'), 0);
     this._statusPane.startTimer();
     this._hideRecordingHelpMessage();
   }
 
   /**
    * @override
    * @param {number} usage
    */
   recordingProgress(usage) {
     this._statusPane.updateProgressBar(Common.UIString('Buffer usage'), usage * 100);
   }
 
   _showRecordingHelpMessage() {
+    if (Runtime.experiments.isEnabled('timelineLandingPage')) {
+      this._showLandingPage();
+      return;
+    }
+
     /**
      * @param {string} tagName
      * @param {string} contents
      * @return {!Element}
      */
     function encloseWithTag(tagName, contents) {
       var e = createElement(tagName);
       e.textContent = contents;
       return e;
     }
@@ skipping 14 matching lines @@
     hintText.createChild('br');
     hintText.appendChild(
         UI.formatLocalized('Then, zoom and pan the timeline with the mousewheel and %s keys.', [navigateNode]));
     this._hideRecordingHelpMessage();
     this._helpMessageElement =
         this._searchableView.element.createChild('div', 'full-widget-dimmed-banner timeline-status-pane');
     this._helpMessageElement.appendChild(hintText);
   }
 
   _hideRecordingHelpMessage() {
+    if (Runtime.experiments.isEnabled('timelineLandingPage')) {
+      this._hideLandingPage();
+      return;
+    }
     if (this._helpMessageElement)
       this._helpMessageElement.remove();
     delete this._helpMessageElement;
   }
 
+  _showLandingPage() {
+    if (this._landingPage)
+      return;
+    this._detailsSplitWidget.detach();
+    this._landingPage = new Timeline.TimelineLandingPage();
+    this._landingPage.show(this._timelinePane.element);
+  }
+
+  _hideLandingPage() {
+    if (!this._landingPage)
+      return;
+    this._landingPage.detach();
+    this._landingPage = null;
+    this._detailsSplitWidget.show(this._timelinePane.element);
+  }
+
   /**
    * @override
    */
   loadingStarted() {
     this._hideRecordingHelpMessage();
 
     if (this._statusPane)
       this._statusPane.hide();
     this._statusPane = new Timeline.TimelinePanel.StatusPane(false, this._cancelLoading.bind(this));
     this._statusPane.showPane(this._statusPaneContainer);
@@ skipping 1216 matching lines @@
   }
 
   /**
    * @override
    * @param {!SDK.Target} target
    */
   targetRemoved(target) {
     this._targets.remove(target, true);
   }
 };