Refactors event dispatching of NativeViewport into its own interface

examples/sample_app/sample_app.cc

 // Copyright 2013 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 <stdio.h>
 #include <string>
 
 #include "base/bind.h"
 #include "base/memory/weak_ptr.h"
 #include "examples/sample_app/gles2_client_impl.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/application_runner.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/services/public/interfaces/gpu/gpu.mojom.h"
 #include "mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
 
 namespace examples {
 
-class SampleApp : public mojo::ApplicationDelegate,
-                  public mojo::NativeViewportClient {
+class SampleApp
+    : public mojo::ApplicationDelegate,
+      public mojo::NativeViewportClient,
+      public mojo::InterfaceImpl<mojo::NativeViewportEventDispatcher> {
  public:
   SampleApp() : weak_factory_(this) {}
 
-  virtual ~SampleApp() {
+  ~SampleApp() override {
     // TODO(darin): Fix shutdown so we don't need to leak this.
     mojo_ignore_result(gles2_client_.release());
   }
 
-  virtual void Initialize(mojo::ApplicationImpl* app) override {
+  void Initialize(mojo::ApplicationImpl* app) override {
     app->ConnectToService("mojo:native_viewport_service", &viewport_);
     viewport_.set_client(this);
 
+    SetEventDispatcher();
+
     // TODO(jamesr): Should be mojo:gpu_service
     app->ConnectToService("mojo:native_viewport_service", &gpu_service_);
 
     mojo::SizePtr size(mojo::Size::New());
     size->width = 800;
     size->height = 600;
     viewport_->Create(size.Pass(),
                       base::Bind(&SampleApp::OnCreatedNativeViewport,
                                  weak_factory_.GetWeakPtr()));
     viewport_->Show();
   }
 
-  virtual void OnDestroyed() override { mojo::RunLoop::current()->Quit(); }
+  void OnDestroyed() override { mojo::RunLoop::current()->Quit(); }
 
-  virtual void OnSizeChanged(mojo::SizePtr size) override {
+  void OnSizeChanged(mojo::SizePtr size) override {
     assert(size);
     if (gles2_client_)
       gles2_client_->SetSize(*size);
   }
 
-  virtual void OnEvent(mojo::EventPtr event,
-                       const mojo::Callback<void()>& callback) override {
+  void OnEvent(mojo::EventPtr event,
+               const mojo::Callback<void()>& callback) override {
     assert(event);
     if (event->location_data && event->location_data->in_view_location)
       gles2_client_->HandleInputEvent(*event);
     callback.Run();
   }
 
  private:
+  void SetEventDispatcher() {
+    mojo::NativeViewportEventDispatcherPtr proxy;
+    mojo::WeakBindToProxy(this, &proxy);
+    viewport_->SetEventDispatcher(proxy.Pass());
+  }
+
   void OnCreatedNativeViewport(uint64_t native_viewport_id) {
     mojo::SizePtr size = mojo::Size::New();
     size->width = 800;
     size->height = 600;
     mojo::CommandBufferPtr command_buffer;
     // TODO(jamesr): Output to a surface instead.
     gpu_service_->CreateOnscreenGLES2Context(
         native_viewport_id, size.Pass(), GetProxy(&command_buffer));
     gles2_client_.reset(new GLES2ClientImpl(command_buffer.Pass()));
   }
 
   scoped_ptr<GLES2ClientImpl> gles2_client_;
   mojo::NativeViewportPtr viewport_;
   mojo::GpuPtr gpu_service_;
   base::WeakPtrFactory<SampleApp> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SampleApp);
 };
 
 }  // namespace examples
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunner runner(new examples::SampleApp);
   return runner.Run(shell_handle);
 }