ash: First pass of Applist v2.

ash/app_list/pagination_model.cc

+// Copyright (c) 2012 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 "ash/app_list/pagination_model.h"
+
+#include "ash/app_list/pagination_model_observer.h"
+
+namespace ash {
+
+PaginationModel::PaginationModel()
+    : total_pages_(-1),
+      selected_page_(-1) {
+}
+
+PaginationModel::~PaginationModel() {
+}
+
+void PaginationModel::SetTotalPages(int total_pages) {
+  if (total_pages == total_pages_)
+    return;
+
+  total_pages_ = total_pages;
+  FOR_EACH_OBSERVER(PaginationModelObserver,
+                    observers_,
+                    TotalPagesChanged());
+}
+
+void PaginationModel::SelectPage(int page) {
+  DCHECK(page >= 0 && page < total_pages_);
+
+  if (page == selected_page_)
+    return;
+
+  int old_selected = selected_page_;
+  selected_page_ = page;
+  FOR_EACH_OBSERVER(PaginationModelObserver,
+                    observers_,
+                    SelectedPageChanged(old_selected, selected_page_));
+}
+
+void PaginationModel::AddObserver(PaginationModelObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void PaginationModel::RemoveObserver(PaginationModelObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+}  // namespace ash