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authortpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-02-10 01:02:50 +0000
committertpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-02-10 01:02:50 +0000
commitc66249b79aa9bfa0924494adcd5345b5b1244b0c (patch)
tree19a77c57cc41d8b522554fbde0c36d6f20d7dc7b /src/gvcore/busylevelmanager.h
downloadgwenview-c66249b79aa9bfa0924494adcd5345b5b1244b0c.tar.gz
gwenview-c66249b79aa9bfa0924494adcd5345b5b1244b0c.zip
Added old abandoned KDE3 version of gwenview
git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/gwenview@1088034 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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
+