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

athena/wm/window_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/wm/public/window_manager.h"
+
+#include "athena/screen/public/screen_manager.h"
+#include "base/logging.h"
+#include "ui/aura/layout_manager.h"
+#include "ui/aura/window.h"
+
+namespace athena {
+namespace {
+
+class WindowManagerImpl : public WindowManager {
+ public:
+  WindowManagerImpl();
+  virtual ~WindowManagerImpl();
+
+  void Layout();
+
+ private:
+  aura::Window* container_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowManagerImpl);
+};
+
+class WindowManagerImpl* instance = NULL;
+
+class AthenaContainerLayoutManager : public aura::LayoutManager {
+ public:
+  AthenaContainerLayoutManager() {}
+  virtual ~AthenaContainerLayoutManager() {}
+
+ private:
+  // aura::LayoutManager:
+  virtual void OnWindowResized() OVERRIDE { instance->Layout(); }
+  virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE {
+    instance->Layout();
+  }
+  virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE {}
+  virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE {
+    instance->Layout();
+  }
+  virtual void OnChildWindowVisibilityChanged(aura::Window* child,
+                                              bool visible) OVERRIDE {
+    instance->Layout();
+  }
+  virtual void SetChildBounds(aura::Window* child,
+                              const gfx::Rect& requested_bounds) OVERRIDE {
+    if (!requested_bounds.IsEmpty())
+      SetChildBoundsDirect(child, requested_bounds);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(AthenaContainerLayoutManager);
+};
+
+WindowManagerImpl::WindowManagerImpl()
+    : container_(ScreenManager::Get()->GetContainerWindow()) {
+  container_->SetLayoutManager(new AthenaContainerLayoutManager);
+  instance = this;
+}
+
+WindowManagerImpl::~WindowManagerImpl() {
+  instance = NULL;
+}
+
+void WindowManagerImpl::Layout() {
+  gfx::Rect bounds = gfx::Rect(container_->bounds().size());
+  // Just make it small a bit so that the background is visible.
+  bounds.Inset(10, 10, 10, 10);
+  const aura::Window::Windows& children = container_->children();
+  for (aura::Window::Windows::const_iterator iter = children.begin();
+       iter != children.end();
+       ++iter) {
+    (*iter)->SetBounds(bounds);
+  }
+}
+
+}  // namespace
+
+// static
+WindowManager* WindowManager::Create() {
+  DCHECK(!instance);
+  new WindowManagerImpl;
+  DCHECK(instance);
+  return instance;
+}
+
+// static
+void WindowManager::Shutdown() {
+  DCHECK(instance);
+  delete instance;
+  DCHECK(!instance);
+}
+
+}  // namespace athena