[DevTools]: Require explicit connection

third_party/WebKit/Source/devtools/front_end/sources/ThreadsSidebarPane.js

 // Copyright 2014 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.
 /**
  * @implements {WebInspector.TargetManager.Observer}
  * @unrestricted
  */
 WebInspector.ThreadsSidebarPane = class extends WebInspector.VBox {
   constructor() {
     super();
 
-    /** @type {!Map.<!WebInspector.DebuggerModel, !WebInspector.UIList.Item>} */
-    this._debuggerModelToListItems = new Map();
-    /** @type {!Map.<!WebInspector.UIList.Item, !WebInspector.Target>} */
-    this._listItemsToTargets = new Map();
     /** @type {?WebInspector.UIList.Item} */
     this._selectedListItem = null;
+    /** @type {!Map<!WebInspector.PendingTarget, !WebInspector.UIList.Item>} */
+    this._pendingToListItem = new Map();
+    /** @type {!Map<!WebInspector.Target, !WebInspector.PendingTarget>} */
+    this._targetToPending = new Map();
+    /** @type {?WebInspector.PendingTarget} */
+    this._mainTargetPending = null;
     this.threadList = new WebInspector.UIList();
     this.threadList.show(this.element);
     WebInspector.targetManager.addModelListener(
         WebInspector.DebuggerModel, WebInspector.DebuggerModel.Events.DebuggerPaused, this._onDebuggerStateChanged,
         this);
     WebInspector.targetManager.addModelListener(
         WebInspector.DebuggerModel, WebInspector.DebuggerModel.Events.DebuggerResumed, this._onDebuggerStateChanged,
         this);
     WebInspector.targetManager.addModelListener(
         WebInspector.RuntimeModel, WebInspector.RuntimeModel.Events.ExecutionContextChanged,
         this._onExecutionContextChanged, this);
     WebInspector.context.addFlavorChangeListener(WebInspector.Target, this._targetChanged, this);
     WebInspector.targetManager.addEventListener(
         WebInspector.TargetManager.Events.NameChanged, this._targetNameChanged, this);
+    WebInspector.targetManager.addModelListener(WebInspector.SubTargetsManager, WebInspector.SubTargetsManager.Events.PendingTargetAdded, this._addTargetItem, this);
+    WebInspector.targetManager.addModelListener(WebInspector.SubTargetsManager, WebInspector.SubTargetsManager.Events.PendingTargetRemoved, this._pendingTargetRemoved, this);
+    WebInspector.targetManager.addModelListener(WebInspector.SubTargetsManager, WebInspector.SubTargetsManager.Events.PendingTargetAttached, this._addTargetItem, this);
+    WebInspector.targetManager.addModelListener(WebInspector.SubTargetsManager, WebInspector.SubTargetsManager.Events.PendingTargetDetached, this._targetDetached, this);
     WebInspector.targetManager.observeTargets(this);
+
+    var pendingTargets = [];
+    for (var target of WebInspector.targetManager.targets(WebInspector.Target.Capability.Target))
+      pendingTargets = pendingTargets.concat(WebInspector.SubTargetsManager.fromTarget(target).pendingTargets());
+
+    pendingTargets
+        .sort(WebInspector.ThreadsSidebarPane._pendingTargetsComparator)
+        .forEach(pendingTarget => this._addListItem(pendingTarget));
+  }
+
+  /**
+   * @return {boolean}
+   */
+  static shouldBeShown() {
+    if (WebInspector.targetManager.targets(WebInspector.Target.Capability.JS).length > 1)
+      return true;
+    for (var target of WebInspector.targetManager.targets(WebInspector.Target.Capability.Target)) {
+      var pendingTargets = WebInspector.SubTargetsManager.fromTarget(target).pendingTargets();
+      if (pendingTargets.some(pendingTarget => pendingTarget.canConnect()))
+        return true;
+    }
+    return false;
+  }
+
+  /**
+   * Sorts show tha connected targets appear first, followed by pending subtargets.
+   *
+   * @param {!WebInspector.PendingTarget} c1
+   * @param {!WebInspector.PendingTarget} c2
+   * @return {number}
+   */
+  static _pendingTargetsComparator(c1, c2)
+  {
+    var t1 = c1.target();
+    var t2 = c2.target();
+    var name1 = t1 ? t1.name() : c1.name();
+    var name2 = t2 ? t2.name() : c2.name();
+    if (!!t1 === !!t2) { // Either both are connected or disconnected
+      return name1.toLowerCase().localeCompare(name2.toLowerCase());
+    } else if (t1) {
+      return -1;
+    }
+    return 1;
+  }
+
+  /**
+   * @param {!WebInspector.Event} event
+   */
+  _addTargetItem(event) {
+    this._addListItem(/** @type {!WebInspector.PendingTarget} */ (event.data));
+  }
+
+  /**
+   * @param {!WebInspector.Event} event
+   */
+  _pendingTargetRemoved(event) {
+    this._removeListItem(/** @type {!WebInspector.PendingTarget} */ (event.data));
+  }
+
+  /**
+   * @param {!WebInspector.Event} event
+   */
+  _targetDetached(event) {
+    this._targetRemoved(/** @type {!WebInspector.PendingTarget} */ (event.data));
+  }
+
+  /**
+   * @param {!WebInspector.PendingTarget} pendingTarget
+   */
+  _addListItem(pendingTarget) {
+    var target = pendingTarget.target();
+    if (!pendingTarget.canConnect() && !(target && target.hasJSCapability()))
+      return;
+
+    var listItem = this._pendingToListItem.get(pendingTarget);
+    if (!listItem) {
+      listItem = new WebInspector.UIList.Item('', '', false);
+      listItem[WebInspector.ThreadsSidebarPane._pendingTargetSymbol] = pendingTarget;
+      listItem[WebInspector.ThreadsSidebarPane._targetSymbol] = target;
+      this._pendingToListItem.set(pendingTarget, listItem);
+      this.threadList.addItem(listItem);
+      listItem.element.addEventListener('click', this._onListItemClick.bind(this, listItem), false);
+    }
+    this._updateListItem(listItem, pendingTarget);
+    this._updateDebuggerState(pendingTarget);
+    var currentTarget = WebInspector.context.flavor(WebInspector.Target);
+    if (currentTarget === target)
+      this._selectListItem(listItem);
+    if (target)
+      this._targetToPending.set(target, pendingTarget);
   }
 
   /**
    * @override
    * @param {!WebInspector.Target} target
    */
   targetAdded(target) {
-    var debuggerModel = WebInspector.DebuggerModel.fromTarget(target);
-    if (!debuggerModel)
+    if (target !== WebInspector.targetManager.mainTarget())
       return;
-
-    var listItem = new WebInspector.UIList.Item(this._titleForTarget(target), '');
-    listItem.element.addEventListener('click', this._onListItemClick.bind(this, listItem), false);
-    var currentTarget = WebInspector.context.flavor(WebInspector.Target);
-    if (currentTarget === target)
-      this._selectListItem(listItem);
-
-    this._debuggerModelToListItems.set(debuggerModel, listItem);
-    this._listItemsToTargets.set(listItem, target);
-    this.threadList.addItem(listItem);
-    this._updateDebuggerState(debuggerModel);
+    console.assert(!this._mainTargetPending);
+    this._mainTargetPending = new WebInspector.ThreadsSidebarPane.MainTargetConnection(target);
+    this._addListItem(this._mainTargetPending);
   }
 
   /**
    * @override
    * @param {!WebInspector.Target} target
    */
   targetRemoved(target) {
-    var debuggerModel = WebInspector.DebuggerModel.fromTarget(target);
-    if (!debuggerModel)
-      return;
-    var listItem = this._debuggerModelToListItems.remove(debuggerModel);
-    if (listItem) {
-      this._listItemsToTargets.remove(listItem);
-      this.threadList.removeItem(listItem);
+    var subtargetManager = WebInspector.SubTargetsManager.fromTarget(target);
+    var pendingTargets = subtargetManager ? subtargetManager.pendingTargets() : [];
+    for (var pendingTarget of pendingTargets) {
+      if (pendingTarget.target())
+        this._targetRemoved(pendingTarget);
+    }
+    if (target === WebInspector.targetManager.mainTarget() && this._mainTargetPending) {
+      this._targetRemoved(this._mainTargetPending);
+      this._mainTargetPending = null;
     }
   }
 
   /**
    * @param {!WebInspector.Event} event
    */
   _targetNameChanged(event) {
     var target = /** @type {!WebInspector.Target} */ (event.data);
     var listItem = this._listItemForTarget(target);
     if (listItem)
-      listItem.setTitle(this._titleForTarget(target));
+      listItem.setTitle(this._titleForPending(this._targetToPending.get(target)));
   }
 
   /**
    * @param {!WebInspector.Event} event
    */
   _targetChanged(event) {
     var listItem = this._listItemForTarget(/** @type {!WebInspector.Target} */ (event.data));
     if (listItem)
       this._selectListItem(listItem);
   }
 
   /**
    * @param {!WebInspector.Target} target
    * @return {?WebInspector.UIList.Item}
    */
   _listItemForTarget(target) {
-    var debuggerModel = WebInspector.DebuggerModel.fromTarget(target);
-    if (!debuggerModel)
-      return null;
-    return this._debuggerModelToListItems.get(debuggerModel) || null;
+    var pendingTarget = this._targetToPending.get(target);
+    return this._pendingToListItem.get(pendingTarget) || null;
   }
 
   /**
-   * @param {!WebInspector.Target} target
+   * @param {!WebInspector.PendingTarget} pendingTarget
    * @return {string}
    */
-  _titleForTarget(target) {
+  _titleForPending(pendingTarget) {
+    var target = pendingTarget.target();
+    if (!target)
+      return pendingTarget.name();
     var executionContext = target.runtimeModel.defaultExecutionContext();
     return executionContext && executionContext.label() ? executionContext.label() : target.name();
   }
 
   /**
    * @param {!WebInspector.Event} event
    */
   _onDebuggerStateChanged(event) {
     var debuggerModel = /** @type {!WebInspector.DebuggerModel} */ (event.target);
-    this._updateDebuggerState(debuggerModel);
+    var pendingTarget = this._targetToPending.get(debuggerModel.target());
+    this._updateDebuggerState(pendingTarget);
   }
 
   /**
    * @param {!WebInspector.Event} event
    */
   _onExecutionContextChanged(event) {
     var executionContext = /** @type {!WebInspector.ExecutionContext} */ (event.data);
     if (!executionContext.isDefault)
       return;
-    var debuggerModel =
-        /** @type {!WebInspector.DebuggerModel} */ (WebInspector.DebuggerModel.fromTarget(executionContext.target()));
-    var listItem = this._debuggerModelToListItems.get(debuggerModel);
+    var pendingTarget = this._targetToPending.get(executionContext.target());
+    var listItem = this._pendingToListItem.get(pendingTarget);
     if (listItem && executionContext.label())
       listItem.setTitle(executionContext.label());
   }
 
   /**
-   * @param {!WebInspector.DebuggerModel} debuggerModel
+   * @param {!WebInspector.PendingTarget} pendingTarget
    */
-  _updateDebuggerState(debuggerModel) {
-    var listItem = this._debuggerModelToListItems.get(debuggerModel);
-    listItem.setSubtitle(WebInspector.UIString(debuggerModel.isPaused() ? 'paused' : ''));
+  _updateDebuggerState(pendingTarget) {
+    var listItem = this._pendingToListItem.get(pendingTarget);
+    var target = pendingTarget.target();
+    var debuggerModel = target && WebInspector.DebuggerModel.fromTarget(target);
+    var isPaused = !!debuggerModel && debuggerModel.isPaused();
+    listItem.setSubtitle(WebInspector.UIString(isPaused ? 'paused' : ''));
   }
 
   /**
    * @param {!WebInspector.UIList.Item} listItem
    */
   _selectListItem(listItem) {
     if (listItem === this._selectedListItem)
       return;
 
     if (this._selectedListItem)
       this._selectedListItem.setSelected(false);
 
     this._selectedListItem = listItem;
     listItem.setSelected(true);
   }
 
   /**
    * @param {!WebInspector.UIList.Item} listItem
    */
   _onListItemClick(listItem) {
-    WebInspector.context.setFlavor(WebInspector.Target, this._listItemsToTargets.get(listItem));
+    var pendingTarget = listItem[WebInspector.ThreadsSidebarPane._pendingTargetSymbol];
+    var target = pendingTarget.target();
+    if (!target)
+      return;
+    WebInspector.context.setFlavor(WebInspector.Target, target);
     listItem.element.scrollIntoViewIfNeeded();
   }
+
+  /**
+   * @param {!WebInspector.UIList.Item} item
+   * @param {!WebInspector.PendingTarget} pendingTarget
+   */
+  _updateListItem(item, pendingTarget) {
+    item.setTitle(this._titleForPending(pendingTarget));
+    item.setSubtitle('');
+    var target = pendingTarget.target();
+    var action = null;
+    var actionLabel = null;
+    if (pendingTarget.canConnect()) {
+      actionLabel = target ? 'Disconnect' : 'Connect';
+      action = this._toggleConnection.bind(this, pendingTarget);
+    }
+    item.setAction(actionLabel, action);
+    item.setDimmed(!target);
+  }
+
+  /**
+   * @param {!WebInspector.Target} target
+   */
+  _selectNewlyAddedTarget(target) {
+    setTimeout(() => WebInspector.context.setFlavor(WebInspector.Target, target));
+  }
+
+  /**
+   * @param {!WebInspector.PendingTarget} pendingTarget
+   * @return {!Promise}
+   */
+  _toggleConnection(pendingTarget) {
+    var target = pendingTarget.target();
+    if (target)
+      return pendingTarget.detach();
+    else
+      return pendingTarget.attach().then(target => this._selectNewlyAddedTarget(target));
+  }
+
+  /**
+   * @param {!WebInspector.PendingTarget} pendingTarget
+   */
+  _targetRemoved(pendingTarget) {
+    var item = this._pendingToListItem.get(pendingTarget);
+    if (!item) // Not all targets are represented in the UI.
+      return;
+    var target = item[WebInspector.ThreadsSidebarPane._targetSymbol];
+    item[WebInspector.ThreadsSidebarPane._targetSymbol] = null;
+    this._targetToPending.remove(target);
+    if (pendingTarget.canConnect())
+      this._updateListItem(item, pendingTarget);
+    else
+      this._removeListItem(pendingTarget);
+  }
+
+  /**
+   * @param {!WebInspector.PendingTarget} pendingTarget
+   */
+  _removeListItem(pendingTarget) {
+    var item = this._pendingToListItem.get(pendingTarget);
+    if (!item)
+      return;
+    this.threadList.removeItem(item);
+    this._pendingToListItem.delete(pendingTarget);
+  }
 };
+
+WebInspector.ThreadsSidebarPane._pendingTargetSymbol = Symbol('_subtargetSymbol');
+WebInspector.ThreadsSidebarPane._targetSymbol = Symbol('_targetSymbol');
+
+/**
+ * @unrestricted
+ */
+WebInspector.ThreadsSidebarPane.MainTargetConnection = class extends WebInspector.PendingTarget {
+  /**
+   * @param {!WebInspector.Target} target
+   */
+  constructor(target) {
+    super('main-target-list-node-' + target.id(), target.title, false, null);
+    this._target = target;
+  }
+
+  /**
+   * @override
+   * @return {!WebInspector.Target}
+   */
+  target() {
+    return this._target;
+  }
+
+  /**
+   * @override
+   * @return {string}
+   */
+  name() {
+    return this._target.name();
+  }
+};