ash/mash: Add a mus-client that sets up ash to provide the system ui for mash.

ash/mus/sysui/sysui_application.cc

+// Copyright 2016 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 "ash/mus/sysui/sysui_application.h"
+
+#include "ash/desktop_background/desktop_background_controller.h"
+#include "ash/host/ash_window_tree_host_init_params.h"
+#include "ash/host/ash_window_tree_host_platform.h"
+#include "ash/mus/sysui/shell_delegate_mus.h"
+#include "ash/mus/sysui/stub_context_factory.h"
+#include "ash/root_window_settings.h"
+#include "ash/shell.h"
+#include "ash/shell_init_params.h"
+#include "base/threading/sequenced_worker_pool.h"
+#include "mojo/shell/public/cpp/application_impl.h"
+#include "ui/aura/env.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/base/ui_base_paths.h"
+#include "ui/message_center/message_center.h"
+#include "ui/platform_window/stub/stub_window.h"
+#include "ui/views/mus/aura_init.h"
+#include "ui/views/mus/native_widget_mus.h"
+#include "ui/views/mus/window_manager_connection.h"
+#include "ui/views/views_delegate.h"
+
+using views::ViewsDelegate;
+
+namespace ash {
+namespace sysui {
+
+namespace {
+
+class AshWindowTreeHostMus : public AshWindowTreeHostPlatform {

[sky, 2016/02/08 17:42:15]

Document this creates a stub window, it doesn't display anything.

[sadrul, 2016/02/08 18:33:24]

Done.

+ public:
+  explicit AshWindowTreeHostMus(const gfx::Rect& initial_bounds)
+      : AshWindowTreeHostPlatform() {
+    scoped_ptr<ui::PlatformWindow> window(new ui::StubWindow(this));
+    window->SetBounds(initial_bounds);
+    SetPlatformWindow(std::move(window));
+  }
+
+  ~AshWindowTreeHostMus() override {}
+
+  void OnBoundsChanged(const gfx::Rect& bounds) override {
+    if (platform_window())
+      AshWindowTreeHostPlatform::OnBoundsChanged(bounds);
+  }
+};
+
+AshWindowTreeHost* CreateWindowTreeHostMus(
+    const AshWindowTreeHostInitParams& init_params) {
+  return new AshWindowTreeHostMus(init_params.initial_bounds);
+}
+
+// Responsible for setting up a RootWindowSettings object for the root-window
+// created for the views::Widget objects.
+class NativeWidgetFactory {
+ public:
+  NativeWidgetFactory() {
+    ViewsDelegate* views_delegate = ViewsDelegate::GetInstance();
+    DCHECK(views_delegate);
+    views_delegate->set_native_widget_factory(base::Bind(
+        &NativeWidgetFactory::InitNativeWidget, base::Unretained(this)));
+  }
+
+  ~NativeWidgetFactory() {
+    ViewsDelegate::GetInstance()->set_native_widget_factory(
+        ViewsDelegate::NativeWidgetFactory());
+  }
+
+ private:
+  views::NativeWidget* InitNativeWidget(
+      const views::Widget::InitParams& params,
+      views::internal::NativeWidgetDelegate* delegate) {
+    views::NativeWidgetMus* native_widget =
+        static_cast<views::NativeWidgetMus*>(
+            views::WindowManagerConnection::Get()->CreateNativeWidgetMus(
+                params, delegate));
+    // TODO: Set the correct display id here.
+    InitRootWindowSettings(native_widget->GetRootWindow())->display_id =
+        Shell::GetInstance()
+            ->display_manager()
+            ->GetPrimaryDisplayCandidate()
+            .id();
+    return native_widget;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(NativeWidgetFactory);
+};
+
+}  // namespace
+
+class AshInit {
+ public:
+  AshInit() : worker_pool_(new base::SequencedWorkerPool(2, "AshWorkerPool")) {
+    ui::RegisterPathProvider();
+    ui::ResourceBundle::InitSharedInstanceWithLocale(
+        "en-US", nullptr, ui::ResourceBundle::LOAD_COMMON_RESOURCES);
+  }
+
+  ~AshInit() { worker_pool_->Shutdown(); }
+
+  aura::Window* root() { return ash::Shell::GetPrimaryRootWindow(); }
+
+  void Initialize(mojo::ApplicationImpl* app) {
+    aura_init_.reset(new views::AuraInit(app, "views_mus_resources.pak"));
+    views::WindowManagerConnection::Create(app);
+
+    gfx::Screen* screen = gfx::Screen::GetScreen();
+    DCHECK(screen);
+    gfx::Size size = screen->GetPrimaryDisplay().bounds().size();
+
+    // Uninstall the ScreenMus installed by WindowManagerConnection, so that ash
+    // installs and uses the ScreenAsh. This can be removed once ash learns to
+    // talk to mus for managing displays.
+    gfx::Screen::SetScreenInstance(nullptr);
+
+    // Install some hook so that the WindowTreeHostMus created for widgets can
+    // be hooked up correctly.
+    native_widget_factory_.reset(new NativeWidgetFactory());
+
+    ash::AshWindowTreeHost::SetFactory(base::Bind(&CreateWindowTreeHostMus));
+    ash_delegate_ = new ShellDelegateMus;
+    message_center::MessageCenter::Initialize();
+
+    ash::ShellInitParams init_params;
+    init_params.delegate = ash_delegate_;
+    init_params.context_factory = new StubContextFactory;
+    init_params.blocking_pool = worker_pool_.get();
+    ash::Shell::CreateInstance(init_params);
+    ash::Shell::GetInstance()->CreateShelf();
+    ash::Shell::GetInstance()->UpdateAfterLoginStatusChange(
+        ash::user::LOGGED_IN_USER);
+    // Reset the context factory, so that NativeWidgetMus installs the context
+    // factory for the views::Widgets correctly.
+    aura::Env::GetInstance()->set_context_factory(nullptr);
+
+    ash::Shell::GetPrimaryRootWindow()->GetHost()->Show();
+    SetupWallpaper(SkColorSetARGB(255, 0, 255, 0));
+  }
+
+  void SetupWallpaper(SkColor color) {
+    SkBitmap bitmap;
+    bitmap.allocN32Pixels(16, 16);
+    bitmap.eraseColor(color);
+#if !defined(NDEBUG)
+    // In debug builds we generate a simple pattern that allows visually
+    // notice if transparency is broken.
+    {
+      SkAutoLockPixels alp(bitmap);
+      *bitmap.getAddr32(0, 0) = SkColorSetRGB(0, 0, 0);
+    }
+#endif
+    gfx::ImageSkia wallpaper = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
+    ash::Shell::GetInstance()
+        ->desktop_background_controller()
+        ->SetWallpaperImage(wallpaper, wallpaper::WALLPAPER_LAYOUT_TILE);
+  }
+
+ private:
+  scoped_refptr<base::SequencedWorkerPool> worker_pool_;
+  scoped_ptr<views::AuraInit> aura_init_;
+  ShellDelegateMus* ash_delegate_ = nullptr;
+  scoped_ptr<NativeWidgetFactory> native_widget_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(AshInit);
+};
+
+SysUIApplication::SysUIApplication() {}
+
+SysUIApplication::~SysUIApplication() {}
+
+void SysUIApplication::Initialize(mojo::ApplicationImpl* app) {
+  ash_init_.reset(new AshInit());
+  ash_init_->Initialize(app);
+}
+
+bool SysUIApplication::ConfigureIncomingConnection(
+    mojo::ApplicationConnection* connection) {
+  return true;
+}
+
+}  // namespace sysui
+}  // namespace ash