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/***************************************************************************
* Copyright (C) 2011 by Timothy Pearson <kb9vqf@pearsoncomputing.net> *
* *
* 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 KROOTBACKING_H
#define KROOTBACKING_H
#include <stdlib.h>
#include <tqobject.h>
#include <tqcolor.h>
#include <tdelibs_export.h>
#ifndef Q_WS_QWS //FIXME
class TQRect;
class TQWidget;
class TQTimer;
class KSharedPixmap;
class KRootBackingData;
/**
* Gets the current full shared desktop pixmap and feeds it to xscreensaver
*
* @author Timothy Pearson <kb9vqf@pearsoncomputing.net>
*/
class KRootBacking: public TQObject
{
Q_OBJECT
public:
/**
* Constructs a KRootBacking.
*/
KRootBacking();
/**
* Destructs the object.
*/
virtual ~KRootBacking();
/**
* Checks if pseudo-transparency is available.
* @return @p true if transparency is available, @p false otherwise.
*/
bool isAvailable() const;
/**
* Returns true if the KRootBacking is active.
*/
bool isActive() const { return m_bActive; }
/**
* Returns the number of the current desktop.
*/
int currentDesktop() const;
#ifndef KDE_NO_COMPAT
/**
* Deprecated, use isAvailable() instead.
* @deprecated
*/
KDE_DEPRECATED bool checkAvailable(bool) { return isAvailable(); }
#endif
/** @since 3.2
* @return the fade color.
*/
const TQColor &color() const { return m_FadeColor; }
/** @since 3.2
* @return the color opacity.
*/
double opacity() const { return m_Fade; }
public slots:
/**
* Starts background handling.
*/
virtual void start();
/**
* Stops background handling.
*/
virtual void stop();
/**
* Sets the fade effect.
*
* This effect will fade the background to the
* specified color.
* @param opacity A value between 0 and 1, indicating the opacity
* of the color. A value of 0 will not change the image, a value of 1
* will use the fade color unchanged.
* @param color The color to fade to.
*/
void setFadeEffect(double opacity, const TQColor &color);
/**
* Repaints the widget background. Normally, you shouldn't need this
* as it is handled automatically.
*
* @param force Force a repaint, even if the contents did not change.
*/
void repaint( bool force );
/**
* Repaints the widget background. Normally, you shouldn't need this
* as it is handled automatically. This is equivalent to calling
* repaint( false ).
*/
void repaint();
/**
* Asks KDesktop to export the desktop background as a KSharedPixmap.
* This method uses DCOP to call KBackgroundIface/setExport(int).
*/
void enableExports();
/**
* Returns the name of the shared pixmap (only needed for low level access)
*/
static TQString pixmapName(int desk);
signals:
/**
* Emitted when the background needs updating and custom painting
* (see setCustomPainting(bool) ) is enabled.
*
* @param pm A pixmap containing the new background.
*/
void backgroundUpdated( const TQPixmap &pm );
protected:
/**
* Called when the pixmap has been updated. The default implementation
* applies the fade effect, then sets the target's background, or emits
* backgroundUpdated(const TQPixmap &) depending on the painting mode.
*/
virtual void updateBackground( KSharedPixmap * );
private slots:
void slotBackgroundChanged(int);
void slotDone(bool);
private:
bool m_bActive, m_bInit;
int m_Desk;
int m_timeout;
double m_Fade;
TQColor m_FadeColor;
TQRect m_Rect;
TQTimer *m_pTimer;
KSharedPixmap *m_pPixmap;
KRootBackingData *d;
void init();
};
#endif // ! Q_WS_QWS
#endif // KROOTBACKING_H
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