92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/*
|
|
* Copyright (C) 2006 Aaron Seigo <aseigo@kde.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Library General Public License version 2 as
|
|
* published by the Free Software Foundation
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef PLASMA_DATASOURCE_H
|
|
#define PLASMA_DATASOURCE_H
|
|
|
|
#include <QtCore/QHash>
|
|
#include <QtCore/QObject>
|
|
|
|
#include <plasma_export.h>
|
|
#include <dataengine.h>
|
|
|
|
namespace Plasma
|
|
{
|
|
/**
|
|
* @brief A set of data exported via a DataEngine
|
|
*
|
|
* Plasma::DataSource wraps the data exported by a DataEngine
|
|
* implementation, providing a generic wrapper for the data.
|
|
*
|
|
* A DataSource may have zero or more associated pieces of data which
|
|
* are keyed by strings. The data itself is stored as QVariants. This allows
|
|
* easy and flexible retrieval of the information associated with this object
|
|
* without writing DataSource or DataEngine specific code in visualizations.
|
|
**/
|
|
class PLASMA_EXPORT DataSource : public QObject
|
|
{
|
|
Q_OBJECT
|
|
|
|
public:
|
|
typedef QHash<QString, DataSource*> Dict;
|
|
typedef QHash<QString, Dict> Grouping;
|
|
|
|
/**
|
|
* Constructs a default DataSource, which has no name or data
|
|
* associated with it
|
|
**/
|
|
explicit DataSource(QObject* parent = 0);
|
|
virtual ~DataSource();
|
|
|
|
/**
|
|
* Returns the data for this DataSource
|
|
**/
|
|
const DataEngine::Data data() const;
|
|
|
|
/**
|
|
* Set a value for a key. This also marks this source as needing
|
|
* to signal an update. After calling this, a call to checkForUpdate()
|
|
* is done by the engine. This allows for batching updates.
|
|
*
|
|
* @param key a string used as the key for the data
|
|
* @param value a QVariant holding the actual data
|
|
**/
|
|
void setData(const QString& key, const QVariant& value);
|
|
|
|
/**
|
|
* Checks for whether the data has changed and therefore an update
|
|
* signal needs to be emitted.
|
|
**/
|
|
void checkForUpdate();
|
|
|
|
Q_SIGNALS:
|
|
/**
|
|
* Emitted when the data has been updated, allowing visualization to
|
|
* reflect the new data.
|
|
**/
|
|
void updated(const QString& source, const Plasma::DataEngine::Data& data);
|
|
|
|
private:
|
|
class Private;
|
|
Private* const d;
|
|
};
|
|
|
|
} // Plasma namespace
|
|
|
|
#endif // multiple inclusion guard
|