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114 lines
2.5 KiB
114 lines
2.5 KiB
// vim: set tabstop=4 shiftwidth=4 noexpandtab
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/*
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Gwenview - A simple image viewer for KDE
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Copyright 2000-2004 Aurélien Gâteau
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef BUSYLEVELMANAGER_H
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#define BUSYLEVELMANAGER_H
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// Qt
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#include <qtimer.h>
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namespace Gwenview {
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// KDE
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#include "libgwenview_export.h"
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/*
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Busy level of the application.
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Sorted by increasing priority.
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*/
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enum BusyLevel {
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BUSY_NONE,
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BUSY_THUMBNAILS,
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BUSY_PRELOADING,
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BUSY_LOADING,
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BUSY_SMOOTHING,
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BUSY_PAINTING,
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BUSY_CHECKING_NEW_IMAGE
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};
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class LIBGWENVIEW_EXPORT BusyLevelManager : public QObject {
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Q_OBJECT
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public:
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static BusyLevelManager* instance();
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/**
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* Announces that the given object is busy.
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*/
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void setBusyLevel( QObject* obj, BusyLevel level );
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/**
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* Returns the busy level of the whole application (i.e. maximum).
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*/
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BusyLevel busyLevel() const;
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signals:
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/**
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* When emitted, operations that are less important than current level
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* should be suspended until the level decreases to their level.
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* E.g. when loading a picture thumbnail generation should get suspended.
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*/
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void busyLevelChanged( BusyLevel level );
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private slots:
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void delayedBusyLevelChanged();
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void objectDestroyed( QObject* obj );
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private:
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BusyLevelManager();
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QMap< QObject*, BusyLevel > mBusyLevels;
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BusyLevel mCurrentBusyLevel;
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QTimer mDelayedBusyLevelTimer;
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};
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/**
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Helper class. Constructor sets its busy level to the given level,
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destructor resets the busy level to none.
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*/
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class BusyLevelHelper : public QObject {
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Q_OBJECT
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public:
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BusyLevelHelper( BusyLevel level );
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~BusyLevelHelper();
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void reset();
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};
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inline
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BusyLevelHelper::BusyLevelHelper( BusyLevel level )
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{
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BusyLevelManager::instance()->setBusyLevel( this, level );
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}
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inline
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void BusyLevelHelper::reset()
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{
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BusyLevelManager::instance()->setBusyLevel( this, BUSY_NONE );
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}
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inline
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BusyLevelHelper::~BusyLevelHelper()
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{
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reset();
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}
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} // namespace
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#endif
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