Add helpers for creating UI components.

mojo/ui/view_provider_app.cc

+// Copyright 2015 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 "mojo/ui/view_provider_app.h"
+
+#include "base/command_line.h"
+#include "base/logging.h"
+
+namespace mojo {
+namespace ui {
+
+class ViewProviderApp::DelegatingViewProvider : public mojo::ui::ViewProvider {
+ public:
+  DelegatingViewProvider(ViewProviderApp* app,
+                         const std::string& view_provider_url)
+      : app_(app), view_provider_url_(view_provider_url) {}
+
+  ~DelegatingViewProvider() override {}
+
+ private:
+  // |ViewProvider|:
+  void CreateView(
+      mojo::InterfaceRequest<mojo::ServiceProvider> services,
+      mojo::ServiceProviderPtr exposed_services,
+      const mojo::ui::ViewProvider::CreateViewCallback& callback) override {
+    app_->CreateView(this, view_provider_url_, services.Pass(),
+                     exposed_services.Pass(), callback);
+  }
+
+  ViewProviderApp* app_;
+  std::string view_provider_url_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(DelegatingViewProvider);
+};
+
+ViewProviderApp::ViewProviderApp() {}
+
+ViewProviderApp::~ViewProviderApp() {}
+
+void ViewProviderApp::Initialize(mojo::ApplicationImpl* app_impl) {
+  app_impl_ = app_impl;
+
+  auto command_line = base::CommandLine::ForCurrentProcess();
+  command_line->InitFromArgv(app_impl_->args());
+  logging::LoggingSettings settings;
+  settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
+  logging::InitLogging(settings);
+}
+
+bool ViewProviderApp::ConfigureIncomingConnection(
+    mojo::ApplicationConnection* connection) {
+  connection->AddService<mojo::ui::ViewProvider>(this);
+  return true;
+}
+
+void ViewProviderApp::Create(
+    mojo::ApplicationConnection* connection,
+    mojo::InterfaceRequest<mojo::ui::ViewProvider> request) {
+  bindings_.AddBinding(
+      new DelegatingViewProvider(this, connection->GetConnectionURL()),
+      request.Pass());
+}
+
+void ViewProviderApp::CreateView(
+    DelegatingViewProvider* provider,
+    const std::string& view_provider_url,
+    mojo::InterfaceRequest<mojo::ServiceProvider> services,
+    mojo::ServiceProviderPtr exposed_services,
+    const mojo::ui::ViewProvider::CreateViewCallback& callback) {
+  if (!CreateView(view_provider_url, services.Pass(), exposed_services.Pass(),
+                  callback)) {
+    bindings_.RemoveBindings(provider);
+    delete provider;
+  }
+}
+
+}  // namespace ui
+}  // namespace mojo