Update the UI examples.

examples/png_viewer/png_viewer.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 <algorithm>
-#include <string>
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
-#include "examples/bitmap_uploader/bitmap_uploader.h"
-#include "mojo/application/application_runner_chromium.h"
-#include "mojo/application/content_handler_factory.h"
-#include "mojo/data_pipe_utils/data_pipe_utils.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/interface_factory_impl.h"
-#include "mojo/public/cpp/application/service_provider_impl.h"
-#include "mojo/services/content_handler/interfaces/content_handler.mojom.h"
-#include "mojo/services/view_manager/cpp/types.h"
-#include "mojo/services/view_manager/cpp/view.h"
-#include "mojo/services/view_manager/cpp/view_manager.h"
-#include "mojo/services/view_manager/cpp/view_manager_client_factory.h"
-#include "mojo/services/view_manager/cpp/view_manager_delegate.h"
-#include "mojo/services/view_manager/cpp/view_observer.h"
-#include "third_party/skia/include/core/SkColor.h"
-#include "ui/gfx/codec/png_codec.h"
-
-namespace mojo {
-namespace examples {
-
-namespace {
-
-class EmbedderData {
- public:
-  EmbedderData(Shell* shell, View* root) : bitmap_uploader_(root) {
-    bitmap_uploader_.Init(shell);
-    bitmap_uploader_.SetColor(SK_ColorGRAY);
-  }
-
-  BitmapUploader& bitmap_uploader() { return bitmap_uploader_; }
-
- private:
-  BitmapUploader bitmap_uploader_;
-
-  DISALLOW_COPY_AND_ASSIGN(EmbedderData);
-};
-
-}  // namespace
-
-// TODO(aa): Hook up ZoomableMedia interface again.
-class PNGView : public ApplicationDelegate,
-                public ViewManagerDelegate,
-                public ViewObserver {
- public:
-  PNGView(URLResponsePtr response)
-      : width_(0),
-        height_(0),
-        app_(nullptr),
-        zoom_percentage_(kDefaultZoomPercentage) {
-    DecodePNG(response.Pass());
-  }
-
-  ~PNGView() override {
-    for (auto& roots : embedder_for_roots_) {
-      roots.first->RemoveObserver(this);
-      delete roots.second;
-    }
-  }
-
- private:
-  static const uint16_t kMaxZoomPercentage = 400;
-  static const uint16_t kMinZoomPercentage = 20;
-  static const uint16_t kDefaultZoomPercentage = 100;
-  static const uint16_t kZoomStep = 20;
-
-  // Overridden from ApplicationDelegate:
-  void Initialize(ApplicationImpl* app) override {
-    app_ = app;
-    view_manager_client_factory_.reset(
-        new ViewManagerClientFactory(app->shell(), this));
-  }
-
-  // Overridden from ApplicationDelegate:
-  bool ConfigureIncomingConnection(
-      ApplicationConnection* connection) override {
-    connection->AddService(view_manager_client_factory_.get());
-    return true;
-  }
-
-  // Overridden from ViewManagerDelegate:
-  void OnEmbed(View* root,
-               InterfaceRequest<ServiceProvider> services,
-               ServiceProviderPtr exposed_services) override {
-    // TODO(qsr): The same view should be embeddable on multiple views.
-    DCHECK(embedder_for_roots_.find(root) == embedder_for_roots_.end());
-    root->AddObserver(this);
-    EmbedderData* embedder_data = new EmbedderData(app_->shell(), root);
-    embedder_for_roots_[root] = embedder_data;
-    embedder_data->bitmap_uploader().SetBitmap(
-        width_, height_,
-        make_scoped_ptr(new std::vector<unsigned char>(*bitmap_)),
-        BitmapUploader::BGRA);
-  }
-
-  void OnViewManagerDisconnected(ViewManager* view_manager) override {
-  }
-
-  // Overridden from ViewObserver:
-  void OnViewBoundsChanged(View* view,
-                           const Rect& old_bounds,
-                           const Rect& new_bounds) override {
-    DCHECK(embedder_for_roots_.find(view) != embedder_for_roots_.end());
-  }
-
-  void OnViewDestroyed(View* view) override {
-    // TODO(aa): Need to figure out how shutdown works.
-    const auto& it = embedder_for_roots_.find(view);
-    DCHECK(it != embedder_for_roots_.end());
-    delete it->second;
-    embedder_for_roots_.erase(it);
-    if (embedder_for_roots_.size() == 0)
-      ApplicationImpl::Terminate();
-  }
-
-  void ZoomIn() {
-    // TODO(qsr,aa) Zoom should be per embedder view.
-    if (zoom_percentage_ >= kMaxZoomPercentage)
-      return;
-    zoom_percentage_ += kZoomStep;
-  }
-
-  void ZoomOut() {
-    if (zoom_percentage_ <= kMinZoomPercentage)
-      return;
-    zoom_percentage_ -= kZoomStep;
-  }
-
-  void ZoomToActualSize() {
-    if (zoom_percentage_ == kDefaultZoomPercentage)
-      return;
-    zoom_percentage_ = kDefaultZoomPercentage;
-  }
-
-  void DecodePNG(URLResponsePtr response) {
-    std::string data;
-    mojo::common::BlockingCopyToString(response->body.Pass(), &data);
-    bitmap_.reset(new std::vector<unsigned char>);
-    gfx::PNGCodec::Decode(reinterpret_cast<const unsigned char*>(data.data()),
-                          data.length(), gfx::PNGCodec::FORMAT_BGRA,
-                          bitmap_.get(), &width_, &height_);
-  }
-
-  int width_;
-  int height_;
-  scoped_ptr<std::vector<unsigned char>> bitmap_;
-  ApplicationImpl* app_;
-  std::map<View*, EmbedderData*> embedder_for_roots_;
-  scoped_ptr<ViewManagerClientFactory> view_manager_client_factory_;
-  uint16_t zoom_percentage_;
-
-  DISALLOW_COPY_AND_ASSIGN(PNGView);
-};
-
-class PNGViewer : public ApplicationDelegate,
-                  public ContentHandlerFactory::ManagedDelegate {
- public:
-  PNGViewer() : content_handler_factory_(this) {}
-
- private:
-  // Overridden from ApplicationDelegate:
-  bool ConfigureIncomingConnection(ApplicationConnection* connection) override {
-    connection->AddService(&content_handler_factory_);
-    return true;
-  }
-
-  // Overridden from ContentHandlerFactory::ManagedDelegate:
-  scoped_ptr<ContentHandlerFactory::HandledApplicationHolder>
-  CreateApplication(InterfaceRequest<Application> application_request,
-                    URLResponsePtr response) override {
-    return make_handled_factory_holder(new mojo::ApplicationImpl(
-        new PNGView(response.Pass()), application_request.Pass()));
-  }
-
-  ContentHandlerFactory content_handler_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(PNGViewer);
-};
-
-}  // namespace examples
-}  // namespace mojo
-
-MojoResult MojoMain(MojoHandle application_request) {
-  mojo::ApplicationRunnerChromium runner(new mojo::examples::PNGViewer());
-  return runner.Run(application_request);
-}