[Athena] minimum impl to add screen/background and test windows

athena/screen/screen_manager_impl.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 "athena/screen/public/screen_manager.h"
+
+#include "athena/screen/background_controller.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/layout_manager.h"
+#include "ui/aura/window.h"
+
+namespace athena {
+namespace {
+
+class FillLayoutManager : public aura::LayoutManager {
+ public:
+  FillLayoutManager(aura::Window* container) : container_(container) {
+    DCHECK(container_);
+  }
+
+  // aura::LayoutManager:
+  virtual void OnWindowResized() OVERRIDE {
+    gfx::Rect full_bounds = gfx::Rect(container_->bounds().size());
+
+    for (aura::Window::Windows::const_iterator iter =
+             container_->children().begin();
+         iter != container_->children().end();
+         ++iter) {
+      SetChildBoundsDirect(*iter, full_bounds);
+    }
+  }
+  virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE {
+    SetChildBoundsDirect(child, (gfx::Rect(container_->bounds().size())));
+  }
+  virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE {}
+  virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE {}
+  virtual void OnChildWindowVisibilityChanged(aura::Window* child,
+                                              bool visible) OVERRIDE {}
+  virtual void SetChildBounds(aura::Window* child,
+                              const gfx::Rect& requested_bounds) OVERRIDE {
+    // Ignore SetBounds request.
+  }
+
+ private:
+  aura::Window* container_;
+};
+
+aura::Window* CreateContainer(aura::Window* parent, const std::string& name) {
+  aura::Window* container = new aura::Window(NULL);
+  container->Init(aura::WINDOW_LAYER_NOT_DRAWN);
+  container->SetName(name);
+  parent->AddChild(container);
+  container->Show();
+  return container;
+}
+
+class ScreenManagerImpl : public ScreenManager {
+ public:
+  explicit ScreenManagerImpl(aura::Window* root);
+  virtual ~ScreenManagerImpl();
+
+  virtual aura::Window* GetContainerWindow() OVERRIDE { return container_; }
+  virtual aura::Window* GetContext() OVERRIDE { return root_window_; }
+  virtual void SetBackgroundImage(const gfx::ImageSkia& image) OVERRIDE;
+
+  void Init();
+
+ private:
+  aura::Window* root_window_;
+  aura::Window* container_;
+  aura::Window* background_window_;
+
+  scoped_ptr<BackgroundController> background_controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreenManagerImpl);
+};
+
+void ScreenManagerImpl::SetBackgroundImage(const gfx::ImageSkia& image) {
+  background_controller_->SetImage(image);
+}
+
+void ScreenManagerImpl::Init() {
+  root_window_->SetLayoutManager(new FillLayoutManager(root_window_));
+  background_window_ = CreateContainer(root_window_, "background");
+  background_window_->SetLayoutManager(
+      new FillLayoutManager(background_window_));
+  background_controller_.reset(new BackgroundController(background_window_));
+  container_ = CreateContainer(root_window_, "container");
+}
+
+ScreenManagerImpl* instance = NULL;
+
+ScreenManagerImpl::ScreenManagerImpl(aura::Window* root)
+    : root_window_(root) {
+  DCHECK(root_window_);
+  DCHECK(!instance);
+  instance = this;
+}
+
+ScreenManagerImpl::~ScreenManagerImpl() {
+  instance = NULL;
+}
+
+}  // namespace
+
+// static
+ScreenManager* ScreenManager::Get() {
+  DCHECK(instance);
+  return instance;
+}
+
+// static
+ScreenManager* ScreenManager::Create(aura::Window* root) {
+  new ScreenManagerImpl(root);
+  instance->Init();
+  return instance;
+}
+
+// static
+void ScreenManager::Shutdown() {
+  DCHECK(instance);
+  delete instance;
+  DCHECK(!instance);
+}
+
+}  // namespace athena