Introduce state to home card.

This is a preparation of crbug.com/387227.

BUG=387227
R=oshima@chromium.org
TEST=manually check for no regression

Review URL: https://codereview.chromium.org/388703002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282686 0039d316-1c4b-4281-b951-d872f2087c98

athena/home/home_card_impl.cc

@@ -93,6 +93,7 @@ class HomeCardImpl : public HomeCard, public AcceleratorHandler {
   void InstallAccelerators();
 
   // Overridden from HomeCard:
+  virtual void SetState(State state) OVERRIDE;
   virtual void RegisterSearchProvider(
       app_list::SearchProvider* search_provider) OVERRIDE;
   virtual void UpdateVirtualKeyboardBounds(
@@ -103,15 +104,17 @@ class HomeCardImpl : public HomeCard, public AcceleratorHandler {
   virtual bool OnAcceleratorFired(int command_id,
                                   const ui::Accelerator& accelerator) OVERRIDE {
     DCHECK_EQ(COMMAND_SHOW_HOME_CARD, command_id);
-    if (home_card_widget_->IsVisible())
-      home_card_widget_->Hide();
+    if (state_ == HIDDEN)
+      SetState(VISIBLE_CENTERED);
     else
-      home_card_widget_->Show();
+      SetState(HIDDEN);
     return true;
   }
 
   scoped_ptr<AppModelBuilder> model_builder_;
 
+  HomeCard::State state_;
+
   views::Widget* home_card_widget_;
   AppListViewDelegate* view_delegate_;
   HomeCardLayoutManager* layout_manager_;
@@ -125,6 +128,7 @@ class HomeCardImpl : public HomeCard, public AcceleratorHandler {
 
 HomeCardImpl::HomeCardImpl(AppModelBuilder* model_builder)
     : model_builder_(model_builder),
+      state_(HIDDEN),
       home_card_widget_(NULL),
       layout_manager_(NULL) {
   DCHECK(!instance);
@@ -138,6 +142,14 @@ HomeCardImpl::~HomeCardImpl() {
   instance = NULL;
 }
 
+void HomeCardImpl::SetState(HomeCard::State state) {
+  if (state == HIDDEN)
+    home_card_widget_->Hide();
+  else
+    home_card_widget_->Show();
+  state_ = state;
+}
+
 void HomeCardImpl::RegisterSearchProvider(
     app_list::SearchProvider* search_provider) {
   DCHECK(!search_provider_);
@@ -170,6 +182,8 @@ void HomeCardImpl::Init() {
       views::BubbleBorder::FLOAT,
       true /* border_accepts_events */);
   home_card_widget_ = view->GetWidget();
+  // TODO: the initial value might not be visible.
+  state_ = VISIBLE_CENTERED;
   view->ShowWhenReady();
 }
 

athena/home/public/home_card.h

@@ -20,6 +20,18 @@ class AppModelBuilder;
 
 class ATHENA_EXPORT HomeCard {
  public:
+  enum State {
+    // HomeCard is not visible.
+    HIDDEN,
+
+    // HomeCard is visible in the center of the screen as a normal mode.
+    VISIBLE_CENTERED,
+
+    // HomeCard is visible smaller at the bottom of the screen as a supplemental
+    // widget.
+    VISIBLE_BOTTOM,
+  };
+
   // Creates/deletes/gets the singleton object of the HomeCard
   // implementation. Takes the ownership of |model_builder|.
   static HomeCard* Create(AppModelBuilder* model_builder);
@@ -28,6 +40,9 @@ class ATHENA_EXPORT HomeCard {
 
   virtual ~HomeCard() {}
 
+  // Update the current state of the home card to |state|.
+  virtual void SetState(State state) = 0;
+
   // Registers a search_provider to the HomeCard. Receiver will take
   // the ownership of the specified provider.
   virtual void RegisterSearchProvider(