DevTools: Introduce Landing page for Timeline panel.

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

Index: third_party/WebKit/Source/devtools/front_end/timeline/TimelineLandingPage.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineLandingPage.js b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineLandingPage.js
new file mode 100644
index 0000000000000000000000000000000000000000..559a97c30d3edb389ae7e4550c4aea05f74ffd45
--- /dev/null
+++ b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineLandingPage.js
@@ -0,0 +1,172 @@
+// 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.
+
+Timeline.TimelineLandingPage = class extends UI.VBox {
+  constructor() {
+    super(true);
+    this.registerRequiredCSS('timeline/timelineLandingPage.css');
+    this.contentElement.classList.add('timeline-landing-page', 'fill');
+    const perspectives = Timeline.TimelinePanel.Perspectives;
+    const config = Timeline.TimelineLandingPage.RecordingConfig;
+    this._tabbedPane = new UI.TabbedPane();
+    this._tabbedPane.setTabSlider(true);
+    this._tabbedPane.renderWithNoHeaderBackground();
+
+    var tab = new Timeline.TimelineLandingPage.PerspectiveTabWidget();
+    tab.setDescription(Common.UIString(
+        'Page Load mode allows you to analyze how fast the page is loaded and becomes responsive.\n' +
+        'In this mode the page is automatically reloaded right after the recording has started. ' +
+        'During recording it collects information about network requests, screen state updates, ' +
+        'and CPU threads acivity along with JavaScript stacks. ' +
+        'Recording is stopped automatically shortly after the page processes load event.'));
+    tab.setAction(recordAndReload);
+    tab.appendOption(config.network, false, true);
+    tab.appendOption(config.screenshots, true, true);
+    this._tabbedPane.appendTab(perspectives.Load, Common.UIString('Page Load'), tab);
+
+    tab = new Timeline.TimelineLandingPage.PerspectiveTabWidget();
+    tab.setDescription(Common.UIString('Record page responsiveness.'));
+    tab.setAction(record);
+    tab.appendOption(config.network, false, true);
+    tab.appendOption(config.screenshots, true, false);
+    this._tabbedPane.appendTab(perspectives.Responsiveness, Common.UIString('Responsiveness'), tab);
+
+    tab = new Timeline.TimelineLandingPage.PerspectiveTabWidget();
+    tab.setDescription(Common.UIString(
+        'This mode is useful when you want to focus on JavaScript performance. ' +
+        'All the options besides sampling CPU profiler are turned off to minimize measurement errors.'));
+    tab.setAction(record);
+    this._tabbedPane.appendTab(perspectives.JavaScript, Common.UIString('JavaScript'), tab);
+
+    tab = new Timeline.TimelineLandingPage.PerspectiveTabWidget();
+    tab.setDescription(Common.UIString('Advanced mode that allows you to customize recording options.'));
+    tab.setAction(record);
+    tab.appendOption(config.network, true, true);
+    tab.appendOption(config.javascript, true, true);
+    tab.appendOption(config.screenshots, true, true);
+    tab.appendOption(config.memory, true, false);
+    tab.appendOption(config.paints, true, false);
+    this._tabbedPane.appendTab(perspectives.Custom, Common.UIString('Custom'), tab);
+
+    this._tabbedPane.addEventListener(UI.TabbedPane.Events.TabSelected, this._tabSelected, this);
+    this._tabbedPane.show(this.contentElement);
+    this._perspectiveSetting =
+        Common.settings.createSetting('timelinePerspective', Timeline.TimelinePanel.Perspectives.Load);
+    this._perspectiveSetting.addChangeListener(this._perspectiveChanged, this);
+
+    function record() {
+      UI.actionRegistry.action('timeline.toggle-recording').execute();
+    }
+
+    function recordAndReload() {
+      SDK.targetManager.reloadPage();
+    }
+  }
+
+  /**
+   * @param {!Common.Event} event
+   */
+  _tabSelected(event) {
+    if (this._perspectiveSetting.get() !== event.data.tabId)
+      this._perspectiveSetting.set(event.data.tabId);
+  }
+
+  _perspectiveChanged() {
+    this._tabbedPane.selectTab(this._perspectiveSetting.get());
+    const tabWidget = /** @type {!Timeline.TimelineLandingPage.PerspectiveTabWidget} */ (this._tabbedPane.visibleView);
+    tabWidget.activate();
+  }
+};
+
+/** @typedef {!{id: string, title: string, description: string, setting: string}} */
+Timeline.TimelineLandingPage.RecordingOption;
+
+/** @type {!Object<string, !Timeline.TimelineLandingPage.RecordingOption>} */
+Timeline.TimelineLandingPage.RecordingConfig = {
+  network: {
+    id: 'network',
+    title: Common.UIString('Network'),
+    description: Common.UIString('Capture network requests information.'),
+    setting: 'timelineCaptureNetwork'
+  },
+  javascript: {
+    id: 'javascript',
+    title: Common.UIString('JavaScript'),
+    description: Common.UIString('Use sampling CPU profiler to collect JavaScript stacks.'),
+    setting: 'timelineEnableJSSampling'
+  },
+  screenshots: {
+    id: 'screenshots',
+    title: Common.UIString('Screenshots'),
+    description:
+        Common.UIString('Collect page screenshots, so you can observe how the page was evolving during recording.'),
+    setting: 'timelineCaptureFilmStrip'
+  },
+  paints: {
+    id: 'paints',
+    title: Common.UIString('Paints'),
+    description: Common.UIString(
+        'Capture graphics layer positions and rasterization draw calls (moderate performance overhead).'),
+    setting: 'timelineCaptureLayersAndPictures'
+  },
+  memory: {
+    id: 'memory',
+    title: Common.UIString('Memory'),
+    description: Common.UIString('Capture memory statistics on every timeline event.'),
+    setting: 'timelineCaptureMemory'
+  }
+};
+
+Timeline.TimelineLandingPage.PerspectiveTabWidget = class extends UI.VBox {
+  constructor() {
+    super(false);
+    this.contentElement.classList.add('timeline-perspective-body');
+    this._enabledOptions = new Set([Timeline.TimelineLandingPage.RecordingConfig.javascript.id]);
+    this._descriptionDiv = this.contentElement.createChild('div', 'timeline-perspective-description');
+    this._actionButton = createTextButton(Common.UIString('Start'));
+    this._actionButtonDiv = this.contentElement.createChild('div');
+    this._actionButtonDiv.appendChild(this._actionButton);
+  }
+
+  /**
+   * @param {string} text
+   */
+  setDescription(text) {
+    this._descriptionDiv.textContent = text;
+  }
+
+  /**
+   * @param {function()} action
+   */
+  setAction(action) {
+    this._actionButton.addEventListener('click', action);
+  }
+
+  /**
+   * @param {!Timeline.TimelineLandingPage.RecordingOption} option
+   * @param {boolean} visible
+   * @param {boolean} enabled
+   */
+  appendOption(option, visible, enabled) {
+    if (enabled)
+      this._enabledOptions.add(option.id);
+    if (!visible)
+      return;
+    const div = createElementWithClass('div', 'recording-setting');
+    const value = this._enabledOptions.has(option.id);
+    const setting = Common.settings.createSetting(option.setting, value);
+    div.appendChild(UI.SettingsUI.createSettingCheckbox(option.title, setting, true));
+    if (option.description)
+      div.createChild('div', 'recording-setting-description').textContent = option.description;
+    this.contentElement.insertBefore(div, this._actionButtonDiv);
+  }
+
+  activate() {
+    for (const id in Timeline.TimelineLandingPage.RecordingConfig) {
+      const config = Timeline.TimelineLandingPage.RecordingConfig[id];
+      const setting = Common.settings.createSetting(config.setting, false);
+      setting.set(this._enabledOptions.has(id));
+    }
+  }
+};