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// Copyright 2017 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 COMPONENTS_EXO_DATA_SOURCE_H_
#define COMPONENTS_EXO_DATA_SOURCE_H_
#include <string>
#include "base/callback.h"
#include "base/containers/flat_set.h"
#include "base/macros.h"
#include "base/observer_list.h"
namespace exo {
class DataSourceDelegate;
class DataSourceObserver;
enum class DndAction;
// Object representing transferred data offered by a client.
class DataSource {
public:
explicit DataSource(DataSourceDelegate* delegate);
~DataSource();
void AddObserver(DataSourceObserver* observer);
void RemoveObserver(DataSourceObserver* observer);
// Notifies to DataSource that the client offers new mime type.
void Offer(const std::string& mime_type);
// Notifies the possible drag and drop actions selected by the data source to
// DataSource.
void SetActions(const base::flat_set<DndAction>& dnd_actions);
// Notifies the data source is cancelled. e.g. Replaced with another data
// source.
void Cancelled();
// Reads data from the source. Then |callback| is invoked with read
// data. If Cancelled() is invoked or DataSource is destroyed before
// completion, the callback is never called.
using ReadDataCallback =
base::OnceCallback<void(const std::vector<uint8_t>&)>;
void ReadData(ReadDataCallback callback);
private:
void OnDataRead(ReadDataCallback callback, const std::vector<uint8_t>&);
DataSourceDelegate* const delegate_;
base::ObserverList<DataSourceObserver> observers_;
// Mime types which has been offered.
std::set<std::string> mime_types_;
bool cancelled_;
base::WeakPtrFactory<DataSource> read_data_weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(DataSource);
};
class ScopedDataSource {
public:
ScopedDataSource(DataSource* data_source, DataSourceObserver* observer);
~ScopedDataSource();
DataSource* get() { return data_source_; }
private:
DataSource* const data_source_;
DataSourceObserver* const observer_;
DISALLOW_COPY_AND_ASSIGN(ScopedDataSource);
};
} // namespace exo
#endif // COMPONENTS_EXO_DATA_SOURCE_H_
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