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// 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_VIEWS_FOCUS_VIEW_STORAGE_H_
#define UI_VIEWS_FOCUS_VIEW_STORAGE_H_
#include <map>
#include <vector>
#include "base/basictypes.h"
#include "ui/views/views_export.h"
template <typename T> struct DefaultSingletonTraits;
// This class is a simple storage place for storing/retrieving views. It is
// used for example in the FocusManager to store/restore focused views when the
// main window becomes active/inactive.
// It automatically removes a view from the storage if the view is removed from
// the tree hierarchy or when the view is destroyed, which ever comes first.
//
// To use it, you first need to create a view storage id that can then be used
// to store/retrieve views.
namespace views {
class View;
class VIEWS_EXPORT ViewStorage {
public:
// Returns the global ViewStorage instance.
// It is guaranted to be non NULL.
static ViewStorage* GetInstance();
// Returns a unique storage id that can be used to store/retrieve views.
int CreateStorageID();
// Associates |view| with the specified |storage_id|.
void StoreView(int storage_id, View* view);
// Returns the view associated with |storage_id| if any, NULL otherwise.
View* RetrieveView(int storage_id);
// Removes the view associated with |storage_id| if any.
void RemoveView(int storage_id);
// Notifies the ViewStorage that a view was removed from its parent somewhere.
void ViewRemoved(View* removed);
size_t view_count() const { return view_to_ids_.size(); }
private:
friend struct DefaultSingletonTraits<ViewStorage>;
ViewStorage();
~ViewStorage();
// Removes the view associated with |storage_id|. If |remove_all_ids| is true,
// all other mapping pointing to the same view are removed as well.
void EraseView(int storage_id, bool remove_all_ids);
// Next id for the view storage.
int view_storage_next_id_;
// The association id to View used for the view storage.
std::map<int, View*> id_to_view_;
// Association View to id, used to speed up view notification removal.
std::map<View*, std::vector<int>*> view_to_ids_;
DISALLOW_COPY_AND_ASSIGN(ViewStorage);
};
} // namespace views
#endif // UI_VIEWS_FOCUS_VIEW_STORAGE_H_
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