Add initial home card impl.

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 {
+class WindowManagerImpl : public WindowManager, public aura::WindowObserver {
  public:
   WindowManagerImpl();
   virtual ~WindowManagerImpl();
 
   void Layout();
 
  private:
-  aura::Window* container_;
+  // aura::WindowObserver
+  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {
+    if (window == container_)
+      container_.reset();
+  }
+
+  scoped_ptr<aura::Window> container_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerImpl);
 };
 
 class WindowManagerImpl* instance = NULL;
 
 class AthenaContainerLayoutManager : public aura::LayoutManager {
  public:
   AthenaContainerLayoutManager() {}
   virtual ~AthenaContainerLayoutManager() {}
@@ skipping 15 matching lines @@
   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_(
+          ScreenManager::Get()->CreateDefaultContainer("MainContainer")) {
   container_->SetLayoutManager(new AthenaContainerLayoutManager);
+  container_->AddObserver(this);
   instance = this;
 }
 
 WindowManagerImpl::~WindowManagerImpl() {
+  if (container_)
+    container_->RemoveObserver(this);
+  container_.reset();
   instance = NULL;
 }
 
 void WindowManagerImpl::Layout() {
+  if (!container_)
+    return;
   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