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/* This file is part of the KDE project
Copyright (C) 2001 David Faure <faure@kde.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License.
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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef KMULTIPLEDRAG_H
#define KMULTIPLEDRAG_H
#ifndef QT_NO_DRAGANDDROP
#include <tqdragobject.h>
#include <tqvaluelist.h>
#include "kdelibs_export.h"
class KMultipleDragPrivate;
/**
* This class makes it easy for applications to provide a drag object
* (for drag-n-drop or for clipboard) that has several representations
* of the same data, under different formats.
*
* Instead of creating a specific class for each case (as would otherwise
* be necessary), you can simply create independent drag objects (e.g.
* a TQImageDrag object and a KURLDrag object), and bundle them together
* using KMultipleDrag.
*
* Sample code for this:
*
* \code
* KMultipleDrag *drag = new KMultipleDrag( tqparentWidget );
* drag->addDragObject( new TQImageDrag( someQImage, 0 ) );
* drag->addDragObject( new KURLDrag( someKURL, 0 ) );
* drag->drag();
* \endcode
*
* Note that the drag objects added to the multiple drag become owned by it.
* For that reason their parent should be 0.
*
* @author David Faure <faure@kde.org>
*/
class KDECORE_EXPORT KMultipleDrag : public TQDragObject
{
Q_OBJECT
public:
/**
* Create a new KMultipleDrag object.
* @param dragSource the parent object which is the source of the data,
* 0 for a parent-less object
* @param name the name of the object, can be 0
*/
KMultipleDrag( TQWidget *dragSource = 0, const char *name = 0 );
/**
* Call this to add each underlying drag object to the multiple drag object.
* The drag object should not have a parent because the multiple drag object
* will own it.
*
* @param dragObject the drag object to add. Should have no parent object.
*/
void addDragObject( TQDragObject *dragObject );
/**
* Returns the data of a drag object with that supports the given
* mime type.
* @param mime the mime type to search
* @return the data, or a null byte array if not found
* @reimp
*/
virtual TQByteArray tqencodedData( const char *mime ) const;
/**
* Returns the @p i'th supported format, or 0.
* @param i the number of the format to check
* @return the format with the number @p i, or 0 otherwise
* @reimp
*/
virtual const char* format( int i ) const;
protected:
// KDE4: make private
TQPtrList<TQDragObject> m_dragObjects;
TQValueList<int> m_numberFormats;
protected:
virtual void virtual_hook( int id, void* data );
private:
KMultipleDragPrivate* d;
};
#endif // QT_NO_DRAGANDDROP
#endif // KMULTIPLEDRAG_H
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