Revert 115515 - [Aura] Implement views-based applist.

ui/base/models/list_model.h

-// Copyright (c) 2011 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_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/observer_list.h"
-#include "base/memory/scoped_vector.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:
-  typedef std::vector<ItemType*> Items;
-
-  ListModel() {}
-  virtual ~ListModel() {}
-
-  // Adds |item| to the model at given |index|.
-  virtual void AddAt(int index, ItemType* item) {
-    DCHECK(index >= 0 && index <= item_count());
-    items_->insert(items_.begin() + index, item);
-    NotifyItemsAdded(index, 1);
-  }
-
-  // Removes an item at given |index| from the model. Note the removed item
-  // is NOT deleted and it's up to the caller to delete it.
-  virtual ItemType* RemoveAt(int index) {
-    DCHECK(index >= 0 && index < item_count());
-    ItemType* item = items_[index];
-    items_->erase(items_.begin() + index);
-    NotifyItemsRemoved(index, 1);
-    return item;
-  }
-
-  // Removes all items from the model. This does NOT delete the items.
-  virtual void RemoveAll() {
-    int count = item_count();
-    items_->clear();
-    NotifyItemsRemoved(0, count);
-  }
-
-  // Removes an item at given |index| from the model and deletes it.
-  virtual void DeleteAt(int index) {
-    delete RemoveAt(index);
-  }
-
-  // Removes and deletes all items from the model.
-  virtual void DeleteAll() {
-    int count = item_count();
-    items_.reset();
-    NotifyItemsRemoved(0, count);
-  }
-
-  // Convenience function to append an item to the model.
-  void Add(ItemType* item) {
-    AddAt(item_count(), item);
-  }
-
-  void AddObserver(ListModelObserver* observer) {
-    observers_.AddObserver(observer);
-  }
-
-  void RemoveObserver(ListModelObserver* observer) {
-    observers_.RemoveObserver(observer);
-  }
-
-  void NotifyItemsAdded(int start, int count) {
-    FOR_EACH_OBSERVER(ListModelObserver,
-                      observers_,
-                      ListItemsAdded(start, count));
-  }
-
-  void NotifyItemsRemoved(int start, int count) {
-    FOR_EACH_OBSERVER(ListModelObserver,
-                      observers_,
-                      ListItemsRemoved(start, count));
-  }
-
-  void NotifyItemsChanged(int start, int count) {
-    FOR_EACH_OBSERVER(ListModelObserver,
-                      observers_,
-                      ListItemsChanged(start, count));
-  }
-
-  int item_count() const { return static_cast<int>(items_.size()); }
-  const Items& items() const { return items_.get(); }
-
-  const ItemType* item_at(int index) const {
-    DCHECK(index >= 0 && index < item_count());
-    return items_[index];
-  }
-  ItemType* item_at(int index) {
-    return const_cast<ItemType*>(
-        const_cast<const ListModel<ItemType>*>(this)->item_at(index));
-  }
-
- private:
-  ScopedVector<ItemType> items_;
-  ObserverList<ListModelObserver> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(ListModel<ItemType>);
-};
-
-}  // namespace ui
-
-#endif  // UI_BASE_MODELS_LIST_MODEL_H_