coDragNDrop.h

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/* This file is part of COVISE.
 
   You can use it under the terms of the GNU Lesser General Public License
   version 2.1 or later, see lgpl-2.1.txt.
 
 * License: LGPL 2+ */
 
#ifndef CO_DRAGNDROP_H
#define CO_DRAGNDROP_H
 
#include <list>
#include <OpenVRUI/coUpdateManager.h>
 
namespace vrui
{
 
class vruiTransformNode;
 
// ------------------------------------------------------------------
class OPENVRUIEXPORT coDragNDrop
{
public:
    enum
    {
        MEDIA_UNKNOWN = 0,
        MEDIA_MENUITEM
    };
 
    coDragNDrop();
    coDragNDrop(int);
 
    // destructor
    virtual ~coDragNDrop();
 
    int getMediaType()
    {
        return mediaType;
    }
 
protected:
    int mediaType;
 
    vruiTransformNode *dragNode;
 
    bool processHit();
 
    void dragOperation();
 
    // this one is supposed to be overloaded and do what
    // the target wants to do!
    // it should return if the operation was sucessful,
    // so the item can be removed or not.
    virtual bool dropOperation(coDragNDrop *) = 0;
};
 
// ------------------------------------------------------------------
class coDragNDropManager : public coUpdateable
{
public:
    coDragNDropManager();
    ~coDragNDropManager();
 
    void signOn(coDragNDrop *);
 
    void signOff(coDragNDrop *);
 
    void drag(coDragNDrop *);
 
    void drop(coDragNDrop *);
 
    coDragNDrop *first(int);
 
    // pointer on myself as hook
    static coDragNDropManager ddManager;
 
private:
    // static global storage of grabbed elements
    std::list<coDragNDrop *> selection;
 
    // static global drag'n'drop classes, for update
    std::list<coDragNDrop *> updateClasses;
 
    bool update();
};
}
#endif