Preliminary interactive layout of window manager's demo_launcher

mojo/examples/browser/browser.cc

 // 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.
 
 #include "base/basictypes.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mojo/examples/window_manager/window_manager.mojom.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
@@ skipping 136 matching lines @@
 // This is the basics of creating a views widget with a textfield.
 // TODO: cleanup!
 class Browser : public ApplicationDelegate,
                 public view_manager::ViewManagerDelegate,
                 public views::TextfieldController,
                 public view_manager::NodeObserver {
  public:
   Browser() : view_manager_(NULL), root_(NULL), widget_(NULL) {}
 
   virtual ~Browser() {
+    if (root_)
+      root_->RemoveObserver(this);
   }
 
  private:
   // Overridden from ApplicationDelegate:
   virtual void Initialize(ApplicationImpl* app) MOJO_OVERRIDE {
     views_init_.reset(new ViewsInit);
     app->ConnectToService("mojo:mojo_window_manager", &navigator_host_);
     app->ConnectToService("mojo:mojo_window_manager", &window_manager_);
  }
 
@@ skipping 67 matching lines @@
     aura::client::FocusClient* focus_client =
         aura::client::GetFocusClient(widget_->GetNativeView());
     if (lost_focus == root_)
       focus_client->FocusWindow(NULL);
     else if (gained_focus == root_)
       focus_client->FocusWindow(widget_->GetNativeView());
   }
   virtual void OnNodeDestroyed(view_manager::Node* node) OVERRIDE {
     DCHECK_EQ(root_, node);
     node->RemoveObserver(this);
+    root_ = NULL;
   }
 
   scoped_ptr<ViewsInit> views_init_;
 
   view_manager::ViewManager* view_manager_;
   view_manager::Node* root_;
   views::Widget* widget_;
   navigation::NavigatorHostPtr navigator_host_;
   IWindowManagerPtr window_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 }  // namespace examples
 
 // static
 ApplicationDelegate* ApplicationDelegate::Create() {
   return new examples::Browser;
 }
 
 }  // namespace mojo