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/* vi: ts=8 sts=4 sw=4
*
* $Id$
* This file is part of the KDE project, module kdesktop.
* Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
*
* You can Freely distribute this program under the GNU Library General
* Public License. See the file "COPYING.LIB" for the exact licensing terms.
*/
#ifndef __KRootPixmap_h_Included__
#define __KRootPixmap_h_Included__
#include <tqobject.h>
#include <tqcolor.h>
#include <kdelibs_export.h>
#ifndef Q_WS_QWS //FIXME
class QRect;
class QWidget;
class QTimer;
class KSharedPixmap;
class KRootPixmapData;
/**
* Creates pseudo-transparent widgets.
*
* A pseudo-transparent widget is a widget with its background pixmap set to
* that part of the desktop background that it is currently obscuring. This
* gives a transparency effect.
*
* To create a transparent widget, construct a KRootPixmap and pass it a
* pointer to your widget. That's it! Moving, resizing and background changes
* are handled automatically.
*
* Instead of using the default behavior, you can ask KRootPixmap
* to emit a backgroundUpdated(const TQPixmap &) signal whenever
* the background needs updating by using setCustomPainting(bool).
* Alternatively by reimplementing updateBackground(KSharedPixmap*)
* you can take complete control of the behavior.
*
* @author Geert Jansen <jansen@kde.org>
* @version $Id$
*/
class KDEUI_EXPORT KRootPixmap: public QObject
{
Q_OBJECT
public:
/**
* Constructs a KRootPixmap. The KRootPixmap will be created as a child
* of the target widget so it will be deleted automatically when the
* widget is destroyed.
*
* @param target A pointer to the widget that you want to make pseudo
* transparent.
* @param name The internal name of the pixmap
*/
KRootPixmap( TQWidget *target, const char *name=0 );
/**
* Constructs a KRootPixmap where the parent TQObject and target TQWidget are
* different.
*/
KRootPixmap( TQWidget *target, TQObject *parent, const char *name=0 );
/**
* Destructs the object.
*/
virtual ~KRootPixmap();
/**
* Checks if pseudo-transparency is available.
* @return @p true if transparency is available, @p false otherwise.
*/
bool isAvailable() const;
/**
* Returns true if the KRootPixmap is active.
*/
bool isActive() const { return m_bActive; }
/**
* Returns the number of the current desktop.
*/
int currentDesktop() const;
/**
* Returns true if custom painting is enabled, false otherwise.
* @see setCustomPainting(bool)
*/
bool customPainting() const { return m_bCustomPaint; }
#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();
/**
* Enables custom handling of the background painting. If custom
* painting is enabled then KRootPixmap will emit a
* backgroundUpdated() signal when the background for the
* target widget changes, instead of applying the new background.
*/
void setCustomPainting( bool enable ) { m_bCustomPaint = enable; }
/**
* 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:
/**
* Reimplemented to filter the events from the target widget and
* track its movements.
*/
virtual bool eventFilter(TQObject *, TQEvent *);
/**
* 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);
void desktopChanged(int desktop);
void desktopChanged( WId window, unsigned int properties );
private:
bool m_bActive, m_bInit, m_bCustomPaint;
int m_Desk;
double m_Fade;
TQColor m_FadeColor;
TQRect m_Rect;
TQWidget *m_pWidget;
TQTimer *m_pTimer;
KSharedPixmap *m_pPixmap;
KRootPixmapData *d;
void init();
};
#endif // ! Q_WS_QWS
#endif // __KRootPixmap_h_Included__
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