// vim: set tabstop=4 shiftwidth=4 noexpandtab /* Gwenview - A simple image viewer for TDE Copyright 2000-2004 Aur�lien G�teau 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 // TQt #include <tqtimer.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 TQObject { Q_OBJECT public: static BusyLevelManager* instance(); /** * Announces that the given object is busy. */ void setBusyLevel( TQObject* 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( TQObject* obj ); private: BusyLevelManager(); TQMap< TQObject*, BusyLevel > mBusyLevels; BusyLevel mCurrentBusyLevel; TQTimer mDelayedBusyLevelTimer; }; /** Helper class. Constructor sets its busy level to the given level, destructor resets the busy level to none. */ class BusyLevelHelper : public TQObject { 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