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// 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_
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