Fork a subset of ash/shelf for use in mash.

mash/shelf/shelf_application.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 "mash/shelf/shelf_application.h"
 
 #include <stdint.h>
 
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "mash/shelf/shelf_view.h"
 #include "mash/wm/public/interfaces/container.mojom.h"
 #include "mojo/shell/public/cpp/application_impl.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/native_widget_mus.h"
 #include "ui/views/mus/window_manager_connection.h"
 
 namespace mash {
 namespace shelf {
 
 ShelfApplication::ShelfApplication() {}
 
 ShelfApplication::~ShelfApplication() {}
 
 void ShelfApplication::Initialize(mojo::ApplicationImpl* app) {
   tracing_.Initialize(app);
 
   aura_init_.reset(new views::AuraInit(app, "views_mus_resources.pak"));
   views::WindowManagerConnection::Create(app);
 
+  // Construct the shelf using a container tagged for positioning by the WM.
   views::Widget* widget = new views::Widget;
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
-  params.delegate = new ShelfView(app);
-
   std::map<std::string, std::vector<uint8_t>> properties;
   properties[mash::wm::mojom::kWindowContainer_Property] =
       mojo::TypeConverter<const std::vector<uint8_t>, int32_t>::Convert(
           static_cast<int32_t>(mash::wm::mojom::Container::USER_SHELF));
   mus::Window* window =
       views::WindowManagerConnection::Get()->NewWindow(properties);
   params.native_widget = new views::NativeWidgetMus(
       widget, app->shell(), window, mus::mojom::SurfaceType::DEFAULT);
   widget->Init(params);
+  widget->SetContentsView(new ShelfView(app));
+  // Call CenterWindow to mimic Widget::Init's placement with a widget delegate.
+  widget->CenterWindow(widget->GetContentsView()->GetPreferredSize());
   widget->Show();
 }
 
 bool ShelfApplication::ConfigureIncomingConnection(
     mojo::ApplicationConnection* connection) {
   return true;
 }
 
 }  // namespace shelf
 }  // namespace mash