Mojo: more idiomatic C++ bindings

mojo/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 "mojo/examples/sample_app/gles2_client_impl.h"
-#include "mojo/public/cpp/bindings/allocation_scope.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/gles2/gles2.h"
 #include "mojo/public/cpp/shell/application.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/public/interfaces/shell/shell.mojom.h"
 #include "mojo/services/native_viewport/native_viewport.mojom.h"
 
 #if defined(WIN32)
 #if !defined(CDECL)
 #define CDECL __cdecl
 #endif
 #define SAMPLE_APP_EXPORT __declspec(dllexport)
 #else
 #define CDECL
 #define SAMPLE_APP_EXPORT __attribute__((visibility("default")))
 #endif
 
 namespace mojo {
 namespace examples {
 
 class SampleApp : public Application, public NativeViewportClient {
  public:
   explicit SampleApp(MojoHandle shell_handle) : Application(shell_handle) {
     ConnectTo("mojo:mojo_native_viewport_service", &viewport_);
     viewport_.set_client(this);
 
-    AllocationScope scope;
-
-    Rect::Builder rect;
-    Point::Builder point;
-    point.set_x(10);
-    point.set_y(10);
-    rect.set_position(point.Finish());
-    Size::Builder size;
-    size.set_width(800);
-    size.set_height(600);
-    rect.set_size(size.Finish());
-    viewport_->Create(rect.Finish());
+    RectPtr rect(Rect::New());
+    rect->position = Point::New();
+    rect->position->x = 10;
+    rect->position->y = 10;
+    rect->size = Size::New();
+    rect->size->width = 800;
+    rect->size->height = 600;
+    viewport_->Create(rect.Pass());
     viewport_->Show();
 
     MessagePipe gles2_pipe;
     viewport_->CreateGLES2Context(gles2_pipe.handle0.Pass());
     gles2_client_.reset(new GLES2ClientImpl(gles2_pipe.handle1.Pass()));
   }
 
   virtual ~SampleApp() {
     // TODO(darin): Fix shutdown so we don't need to leak this.
     MOJO_ALLOW_UNUSED GLES2ClientImpl* leaked = gles2_client_.release();
   }
 
   virtual void OnCreated() MOJO_OVERRIDE {
   }
 
   virtual void OnDestroyed() MOJO_OVERRIDE {
     RunLoop::current()->Quit();
   }
 
-  virtual void OnBoundsChanged(const Rect& bounds) MOJO_OVERRIDE {
-    gles2_client_->SetSize(bounds.size());
+  virtual void OnBoundsChanged(RectPtr bounds) MOJO_OVERRIDE {
+    assert(bounds);
+    assert(bounds->size);
+    gles2_client_->SetSize(*bounds->size);
   }
 
-  virtual void OnEvent(const Event& event,
+  virtual void OnEvent(EventPtr event,
                        const Callback<void()>& callback) MOJO_OVERRIDE {
-    if (!event.location().is_null())
-      gles2_client_->HandleInputEvent(event);
+    assert(event);
+    if (event->location)
+      gles2_client_->HandleInputEvent(*event);
     callback.Run();
   }
 
  private:
   scoped_ptr<GLES2ClientImpl> gles2_client_;
   NativeViewportPtr viewport_;
 };
 
 }  // namespace examples
 }  // namespace mojo
 
 extern "C" SAMPLE_APP_EXPORT MojoResult CDECL MojoMain(
     MojoHandle shell_handle) {
   mojo::Environment env;
   mojo::RunLoop loop;
   mojo::GLES2Initializer gles2;
 
   mojo::examples::SampleApp app(shell_handle);
   loop.Run();
   return MOJO_RESULT_OK;
 }