It is time.

ui/base/models/list_model.h

-// 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.
-
-#ifndef UI_BASE_MODELS_LIST_MODEL_H_
-#define UI_BASE_MODELS_LIST_MODEL_H_
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/scoped_vector.h"
-#include "base/observer_list.h"
-#include "ui/base/models/list_model_observer.h"
-
-namespace ui {
-
-// A list model that manages a list of ItemType pointers. Items added to the
-// model are owned by the model. An item can be taken out of the model by
-// RemoveAt.
-template <class ItemType>
-class ListModel {
- public:
-  ListModel() {}
-  ~ListModel() {}
-
-  // Adds |item| at the |index| into |items_|. Takes ownership of |item|.
-  void AddAt(size_t index, ItemType* item) {
-    DCHECK_LE(index, item_count());
-    items_.insert(items_.begin() + index, item);
-    NotifyItemsAdded(index, 1);
-  }
-
-  // Convenience function to append an item to the model.
-  void Add(ItemType* item) {
-    AddAt(item_count(), item);
-  }
-
-  // Removes the item at |index| from |items_| without deleting it.
-  // Returns a scoped pointer containing the removed item.
-  scoped_ptr<ItemType> RemoveAt(size_t index) {
-    DCHECK_LT(index, item_count());
-    ItemType* item = items_[index];
-    items_.weak_erase(items_.begin() + index);
-    NotifyItemsRemoved(index, 1);
-    return make_scoped_ptr<ItemType>(item);
-  }
-
-  // Removes all items from the model. This does NOT delete the items.
-  void RemoveAll() {
-    size_t count = item_count();
-    items_.weak_clear();
-    NotifyItemsRemoved(0, count);
-  }
-
-  // Removes the item at |index| from |items_| and deletes it.
-  void DeleteAt(size_t index) {
-    scoped_ptr<ItemType> item = RemoveAt(index);
-    // |item| will be deleted on destruction.
-  }
-
-  // Removes and deletes all items from the model.
-  void DeleteAll() {
-    ScopedVector<ItemType> to_be_deleted(items_.Pass());
-    NotifyItemsRemoved(0, to_be_deleted.size());
-  }
-
-  // Moves the item at |index| to |target_index|. |target_index| is in terms
-  // of the model *after* the item at |index| is removed.
-  void Move(size_t index, size_t target_index) {
-    DCHECK_LT(index, item_count());
-    DCHECK_LT(target_index, item_count());
-
-    if (index == target_index)
-      return;
-
-    ItemType* item = items_[index];
-    items_.weak_erase(items_.begin() + index);
-    items_.insert(items_.begin() + target_index, item);
-    NotifyItemMoved(index, target_index);
-  }
-
-  void AddObserver(ListModelObserver* observer) {
-    observers_.AddObserver(observer);
-  }
-
-  void RemoveObserver(ListModelObserver* observer) {
-    observers_.RemoveObserver(observer);
-  }
-
-  void NotifyItemsAdded(size_t start, size_t count) {
-    FOR_EACH_OBSERVER(ListModelObserver,
-                      observers_,
-                      ListItemsAdded(start, count));
-  }
-
-  void NotifyItemsRemoved(size_t start, size_t count) {
-    FOR_EACH_OBSERVER(ListModelObserver,
-                      observers_,
-                      ListItemsRemoved(start, count));
-  }
-
-  void NotifyItemMoved(size_t index, size_t target_index) {
-    FOR_EACH_OBSERVER(ListModelObserver,
-                      observers_,
-                      ListItemMoved(index, target_index));
-  }
-
-  void NotifyItemsChanged(size_t start, size_t count) {
-    FOR_EACH_OBSERVER(ListModelObserver,
-                      observers_,
-                      ListItemsChanged(start, count));
-  }
-
-  size_t item_count() const { return items_.size(); }
-
-  const ItemType* GetItemAt(size_t index) const {
-    DCHECK_LT(index, item_count());
-    return items_[index];
-  }
-  ItemType* GetItemAt(size_t index) {
-    return const_cast<ItemType*>(
-        const_cast<const ListModel<ItemType>*>(this)->GetItemAt(index));
-  }
-
- private:
-  ScopedVector<ItemType> items_;
-  ObserverList<ListModelObserver> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(ListModel<ItemType>);
-};
-
-}  // namespace ui
-
-#endif  // UI_BASE_MODELS_LIST_MODEL_H_