DD/DD_Source.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *
 *      Rob Bairos
 *      Side Effects Software Inc
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *      NAME:                    DD_Source.h
 *
 * COMMENTS:
 *
 *
 */

#ifndef __DD_Source_
#define __DD_Source_

#include "DD_API.h"
#include "DD_ChoiceList.h"

class DD_API DD_Source
{

public:

    DD_Source();
    virtual ~DD_Source();

    // Generalized query method to retrieve data items
    // from the source (dragged object)
    //  0 = not available
    //  1 = available
    // -1 = reject and abort search (eg dragging onto source object)

    virtual void *getSourceData(const char *label, void *parm_data) = 0;

    // Similar to above, but subclass to avoid calculating the actual value
    virtual int  hasSourceData(const char *label);

    // Mechanism to allow the source to modify itself
    // whether or not its currently being accepted (change cursors, etc).

    virtual void        saveDragDropState();
    virtual void        dragDropAccepted(bool onoff);
    virtual void        restoreDragDropState();


    // Set up these parameters for receiving tests

    void                setSourceXY(int x, int y)
                        { mySourceX = x; mySourceY = y; }

    int                 getSourceX() const
                        { return mySourceX; }

    int                 getSourceY() const
                        { return mySourceY; }

private:

    int                 mySourceX;
    int                 mySourceY;

};

#endif 

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