Making answer card to behave like other results.

ui/app_list/views/search_result_answer_card_view.h

+// Copyright 2017 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.
+
+#ifndef UI_APP_LIST_VIEWS_SEARCH_RESULT_ANSWER_CARD_VIEW_H_
+#define UI_APP_LIST_VIEWS_SEARCH_RESULT_ANSWER_CARD_VIEW_H_
+
+#include "ui/app_list/app_list_model_observer.h"
+#include "ui/app_list/views/search_result_container_view.h"
+
+namespace app_list {
+
+class AppListModel;
+class SearchResultPageView;
+
+// Result container for the search answer card.
+class APP_LIST_EXPORT SearchResultAnswerCardView
+    : public SearchResultContainerView,
+      public AppListModelObserver {
+ public:
+  SearchResultAnswerCardView(AppListModel* model,
+                             SearchResultPageView* search_results_page_view,
+                             views::View* search_answer_view);
+  ~SearchResultAnswerCardView() override;
+
+ private:
+  class SearchAnswerContainerView;
+
+  // Overridden from views::View:
+  const char* GetClassName() const override;
+
+  // Overridden from SearchResultContainerView:
+  void OnContainerSelected(bool from_bottom,
+                           bool directional_movement) override;
+  void NotifyFirstResultYIndex(int y_index) override {}
+  int GetYSize() override;
+  int DoUpdate() override;
+  void UpdateSelectedIndex(int old_selected, int new_selected) override;
+
+  // Overridden from AppListModelObserver
+  void OnSearchAnswerAvailableChanged(bool has_answer) override;
+
+  // Unowned pointer to application list model.
+  AppListModel* const model_;
+
+  // Pointer to the container of the search answer; owned by the view hierarchy.
+  // It's visible iff we have a search answer result.
+  SearchAnswerContainerView* const search_answer_container_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(SearchResultAnswerCardView);
+};
+
+}  // namespace app_list
+
+#endif  // UI_APP_LIST_VIEWS_SEARCH_RESULT_ANSWER_CARD_VIEW_H_