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// vim: set tabstop=4 shiftwidth=4 noexpandtab
/*
Gwenview - A simple image viewer for KDE
Copyright 2000-2004 Aurélien Gâteau
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
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 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 BUSYLEVELMANAGER_H
#define BUSYLEVELMANAGER_H
// Qt
#include <qtimer.h>
namespace Gwenview {
// KDE
#include "libgwenview_export.h"
/*
Busy level of the application.
Sorted by increasing priority.
*/
enum BusyLevel {
BUSY_NONE,
BUSY_THUMBNAILS,
BUSY_PRELOADING,
BUSY_LOADING,
BUSY_SMOOTHING,
BUSY_PAINTING,
BUSY_CHECKING_NEW_IMAGE
};
class LIBGWENVIEW_EXPORT BusyLevelManager : public QObject {
Q_OBJECT
public:
static BusyLevelManager* instance();
/**
* Announces that the given object is busy.
*/
void setBusyLevel( QObject* obj, BusyLevel level );
/**
* Returns the busy level of the whole application (i.e. maximum).
*/
BusyLevel busyLevel() const;
signals:
/**
* When emitted, operations that are less important than current level
* should be suspended until the level decreases to their level.
* E.g. when loading a picture thumbnail generation should get suspended.
*/
void busyLevelChanged( BusyLevel level );
private slots:
void delayedBusyLevelChanged();
void objectDestroyed( QObject* obj );
private:
BusyLevelManager();
QMap< QObject*, BusyLevel > mBusyLevels;
BusyLevel mCurrentBusyLevel;
QTimer mDelayedBusyLevelTimer;
};
/**
Helper class. Constructor sets its busy level to the given level,
destructor resets the busy level to none.
*/
class BusyLevelHelper : public QObject {
Q_OBJECT
public:
BusyLevelHelper( BusyLevel level );
~BusyLevelHelper();
void reset();
};
inline
BusyLevelHelper::BusyLevelHelper( BusyLevel level )
{
BusyLevelManager::instance()->setBusyLevel( this, level );
}
inline
void BusyLevelHelper::reset()
{
BusyLevelManager::instance()->setBusyLevel( this, BUSY_NONE );
}
inline
BusyLevelHelper::~BusyLevelHelper()
{
reset();
}
} // namespace
#endif
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