Turn 'browser' app into a 'launcher_ui' app that window_manager embeds.

mojo/examples/window_manager/window_manager.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/bind.h"
 #include "base/strings/stringprintf.h"
 #include "mojo/examples/window_manager/window_manager.mojom.h"
 #include "mojo/public/cpp/application/application.h"
 #include "mojo/services/navigation/navigation.mojom.h"
 #include "mojo/services/public/cpp/view_manager/node.h"
 #include "mojo/services/public/cpp/view_manager/view.h"
 #include "mojo/services/public/cpp/view_manager/view_manager.h"
 #include "mojo/services/public/cpp/view_manager/view_manager_delegate.h"
 #include "mojo/services/public/cpp/view_manager/view_observer.h"
+#include "mojo/services/public/interfaces/launcher/launcher.mojom.h"
 #include "ui/events/event_constants.h"
 
 #if defined CreateWindow
 #undef CreateWindow
 #endif
 
 using mojo::view_manager::Id;
 using mojo::view_manager::Node;
 using mojo::view_manager::NodeObserver;
 using mojo::view_manager::View;
 using mojo::view_manager::ViewManager;
 using mojo::view_manager::ViewManagerDelegate;
 using mojo::view_manager::ViewObserver;
 
 namespace mojo {
 namespace examples {
 
 class WindowManager;
 
 namespace {
 
 const SkColor kColors[] = { SK_ColorYELLOW,
                             SK_ColorRED,
                             SK_ColorGREEN,
                             SK_ColorMAGENTA };
 
-const char kEmbeddedAppURL[] = "mojo:mojo_embedded_app";
-const char kNestingAppURL[] = "mojo:mojo_nesting_app";
-const char kMojoBrowserURL[] = "mojo:mojo_browser";
-
 }  // namespace
 
 class WindowManagerConnection : public InterfaceImpl<IWindowManager> {
  public:
   explicit WindowManagerConnection(WindowManager* window_manager)
       : window_manager_(window_manager) {}
   virtual ~WindowManagerConnection() {}
 
  private:
   // Overridden from IWindowManager:
   virtual void CloseWindow(Id node_id) OVERRIDE;
 
   WindowManager* window_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerConnection);
 };
 
+class NavigatorHost : public InterfaceImpl<navigation::NavigatorHost> {
+ public:
+  explicit NavigatorHost(WindowManager* window_manager)
+      : window_manager_(window_manager) {
+  }
+  virtual ~NavigatorHost() {
+  }
+ private:
+  virtual void RequestNavigate(
+      uint32 source_node_id,
+      navigation::NavigationDetailsPtr nav_details) OVERRIDE;
+  WindowManager* window_manager_;
+  DISALLOW_COPY_AND_ASSIGN(NavigatorHost);
+};
+
 class WindowManager : public Application,
                       public ViewObserver,
-                      public ViewManagerDelegate {
+                      public ViewManagerDelegate,
+                      public InterfaceImpl<launcher::LauncherClient> {
  public:
-  WindowManager() : view_manager_(NULL) {}
+  WindowManager() : launcher_ui_(NULL), view_manager_(NULL) {}
   virtual ~WindowManager() {}
 
   void CloseWindow(Id node_id) {
     Node* node = view_manager_->GetNodeById(node_id);
     DCHECK(node);
+    std::vector<Node*>::iterator iter =
+        std::find(windows_.begin(), windows_.end(), node);
+    DCHECK(iter != windows_.end());
+    windows_.erase(iter);
     node->Destroy();
   }
 
+  void RequestNavigate(
+    uint32 source_node_id,
+    navigation::NavigationDetailsPtr nav_details) {
+    if (!launcher_.get()) {
+      ConnectTo("mojo:mojo_launcher", &launcher_);
+      launcher_.set_client(this);
+    }
+    launcher_->Launch(nav_details->url);
+  }
+
  private:
   // Overridden from Application:
   virtual void Initialize() MOJO_OVERRIDE {
     AddService<WindowManagerConnection>(this);
+    AddService<NavigatorHost>(this);
     ViewManager::Create(this, this);
   }
 
     // Overridden from ViewObserver:
   virtual void OnViewInputEvent(View* view, const EventPtr& event) OVERRIDE {
     if (event->action == ui::ET_MOUSE_RELEASED) {
+      std::string app_url;
       if (event->flags & ui::EF_LEFT_MOUSE_BUTTON)
-        CreateWindow(kEmbeddedAppURL);
+        app_url = "mojo:mojo_embedded_app";
       else if (event->flags & ui::EF_RIGHT_MOUSE_BUTTON)
-        CreateWindow(kNestingAppURL);
-      else if (event->flags & ui::EF_MIDDLE_MOUSE_BUTTON)
-        CreateWindow(kMojoBrowserURL);
+        app_url = "mojo:mojo_nesting_app";
+      DCHECK(!app_url.empty());
+
+      Node* node = view_manager_->GetNodeById(parent_node_id_);
+      navigation::NavigationDetailsPtr nav_details(
+          navigation::NavigationDetails::New());
+      size_t index = node->children().size() - 1;
+      nav_details->url = base::StringPrintf(
+          "%s/%x", app_url.c_str(), kColors[index % arraysize(kColors)]);
+      CreateWindow(app_url, nav_details.Pass());
     }
   }
 
   // Overridden from ViewManagerDelegate:
   virtual void OnRootAdded(ViewManager* view_manager, Node* root) OVERRIDE {
     DCHECK(!view_manager_);
     view_manager_ = view_manager;
 
     Node* node = Node::Create(view_manager);
     view_manager->GetRoots().front()->AddChild(node);
     node->SetBounds(gfx::Rect(800, 600));
     parent_node_id_ = node->id();
 
     View* view = View::Create(view_manager);
     node->SetActiveView(view);
     view->SetColor(SK_ColorBLUE);
     view->AddObserver(this);
+
+    CreateLauncherUI();
   }
 
-  void CreateWindow(const std::string& url) {
-    Node* node = view_manager_->GetNodeById(parent_node_id_);
+  // Overridden from LauncherClient:
+  virtual void OnLaunch(
+      const mojo::String& handler_url,
+      URLResponsePtr response,
+      ScopedDataPipeConsumerHandle response_body_stream) OVERRIDE {
+    navigation::NavigationDetailsPtr nav_details(
+        navigation::NavigationDetails::New());
+    nav_details->url = response->url;
+    nav_details->response = response.Pass();
+    nav_details->response_body_stream = response_body_stream.Pass();
+    CreateWindow(handler_url, nav_details.Pass());
+  }
 
-    gfx::Rect bounds(50, 50, 400, 400);
-    if (!node->children().empty()) {
-      gfx::Point position = node->children().back()->bounds().origin();
-      position.Offset(50, 50);
+  void CreateLauncherUI() {
+    navigation::NavigationDetailsPtr nav_details;
+    launcher_ui_ = CreateChild("mojo:mojo_browser", gfx::Rect(25, 25, 400, 25),
+                               nav_details.Pass());
+  }
+
+  void CreateWindow(const std::string& handler_url,
+                    navigation::NavigationDetailsPtr nav_details) {
+    gfx::Rect bounds(25, 75, 400, 400);
+    if (!windows_.empty()) {
+      gfx::Point position = windows_.back()->bounds().origin();
+      position.Offset(35, 35);
       bounds.set_origin(position);
     }
+    windows_.push_back(CreateChild(handler_url, bounds, nav_details.Pass()));
+  }
 
+  Node* CreateChild(const std::string& url,
+                    const gfx::Rect& bounds,
+                    navigation::NavigationDetailsPtr nav_details) {
+    Node* node = view_manager_->GetNodeById(parent_node_id_);
     Node* embedded = Node::Create(view_manager_);
     node->AddChild(embedded);
     embedded->SetBounds(bounds);
     embedded->Embed(url);
 
-    // TODO(aa): Is there a way to ask for an interface and test whether it
-    // succeeded? That would be nicer than hard-coding the URLs that are known
-    // to support navigation.
-    if (url == kEmbeddedAppURL || url == kNestingAppURL) {
-      // TODO(aa): This means that there can only ever be one instance of every
-      // app, which seems wrong. Instead, perhaps embedder should get back a
-      // service provider that allows it to talk to embeddee.
+    if (nav_details.get()) {
       navigation::NavigatorPtr navigator;
       ConnectTo(url, &navigator);
-      navigation::NavigationDetailsPtr details(
-          navigation::NavigationDetails::New());
-      size_t index = node->children().size() - 1;
-      details->url = base::StringPrintf(
-          "%s/%x", kEmbeddedAppURL, kColors[index % arraysize(kColors)]);
-      navigator->Navigate(embedded->id(), details.Pass());
+      navigator->Navigate(embedded->id(), nav_details.Pass());
     }
+
+    return embedded;
   }
 
+  launcher::LauncherPtr launcher_;
+  Node* launcher_ui_;
+  std::vector<Node*> windows_;
   ViewManager* view_manager_;
   Id parent_node_id_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManager);
 };
 
 void WindowManagerConnection::CloseWindow(Id node_id) {
   window_manager_->CloseWindow(node_id);
 }
 
+void NavigatorHost::RequestNavigate(
+    uint32 source_node_id,
+    navigation::NavigationDetailsPtr nav_details) {
+  window_manager_->RequestNavigate(source_node_id, nav_details.Pass());
+}
+
 }  // namespace examples
 
 // static
 Application* Application::Create() {
   return new examples::WindowManager;
 }
 
 }  // namespace mojo