athena: Add a minimized state for the home-card.

athena/wm/window_manager_impl.cc

Index: athena/wm/window_manager_impl.cc
diff --git a/athena/wm/window_manager_impl.cc b/athena/wm/window_manager_impl.cc
index 589da390733ec1ecf3999c24c0b16278b8b5d35c..713b39b1baffd3203adfcd0053f992b0fb7b268a 100644
--- a/athena/wm/window_manager_impl.cc
+++ b/athena/wm/window_manager_impl.cc
@@ -5,8 +5,10 @@
 #include "athena/wm/public/window_manager.h"
 
 #include "athena/screen/public/screen_manager.h"
+#include "athena/wm/public/window_manager_observer.h"
 #include "athena/wm/window_overview_mode.h"
 #include "base/logging.h"
+#include "base/observer_list.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
 #include "ui/wm/public/window_types.h"
@@ -25,18 +27,34 @@ class WindowManagerImpl : public WindowManager,
 
   // WindowManager:
   virtual void ToggleOverview() OVERRIDE {
-    if (overview_)
+    if (overview_) {
       overview_.reset();
-    else
+      FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
+                        OnOverviewModeExit());
+    } else {
       overview_ = WindowOverviewMode::Create(container_.get(), this);
+      FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
+                        OnOverviewModeEnter());
+    }
   }
 
  private:
+  // WindowManager:
+  virtual void AddObserver(WindowManagerObserver* observer) OVERRIDE {
+    observers_.AddObserver(observer);
+  }
+
+  virtual void RemoveObserver(WindowManagerObserver* observer) OVERRIDE {
+    observers_.RemoveObserver(observer);
+  }
+
   // WindowOverviewModeDelegate:
   virtual void OnSelectWindow(aura::Window* window) OVERRIDE {
     CHECK_EQ(container_.get(), window->parent());
     container_->StackChildAtTop(window);
     overview_.reset();
+    FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
+                      OnOverviewModeExit());
   }
 
   // aura::WindowObserver
@@ -48,6 +66,7 @@ class WindowManagerImpl : public WindowManager,
   scoped_ptr<aura::Window> container_;
   scoped_ptr<ui::EventHandler> temp_handler_;
   scoped_ptr<WindowOverviewMode> overview_;
+  ObserverList<WindowManagerObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerImpl);
 };
@@ -148,4 +167,10 @@ void WindowManager::Shutdown() {
   DCHECK(!instance);
 }
 
+// static
+WindowManager* WindowManager::GetInstance() {
+  DCHECK(instance);
+  return instance;
+}
+
 }  // namespace athena