// =================================================================================
//	CDragItem.h				©1995 J. Rodden, DD/MF & Associates. All rights reserved
// =================================================================================
// Mixin class to be used with anything that supports dragging of it's items.
// CDragItem encapsulates the characteristics of a draggable item.
//
// By using CDragItem and overriding AddFlavors and MakeDragRegion, you can
// (a) include as many flavors of an item as you want, (b) define your own outline
// to replace the generic rectangle that LDragTask provides, (c) arrange to send 
// drag data on demand by calling InstallDragSendData when adding flavors (and 
// installing null data in the drag) and overriding DoSendDragData for the object 
// being dragged, and (d) override the drag manager's default behaviors for DragInput 
// and DragDrawing by calling InstallDragInput or InstallDragDrawing and overriding 
// DoDragInput or DoDragDrawing respectively.
// =================================================================================

#pragma once

#include <PP_Prefix.h>

#ifndef __DRAG__
#include <Drag.h>
#endif

const ItemReference	kItemRef = 1;

// =================================================================================
//		€ CDragItem
// =================================================================================

class CDragItem
{
public:
					 CDragItem() { };
			
	virtual	void	AddFlavors(DragReference inDragRef);
	virtual void	MakeDragRegion( DragReference inDragRef, RgnHandle inDragRegion);

	virtual void	SetLocalFrame();
	virtual	void	DrawDragRegion();
	virtual Boolean	AddToDragRgn(RgnHandle inDragRegion);	
	virtual void	OutlineRegion(RgnHandle inRegion);

	virtual void	DoDragSendData(FlavorType inFlavor,
								ItemReference inItemRef,
								DragReference inDragRef);
								
	virtual void	DoDragInput(Point *ioMouse, Int16 *ioModifiers,
								DragReference inDragRef);
								
	virtual void	DoDragDrawing(DragRegionMessage inMessage,
								RgnHandle inShowRgn, Point inShowOrigin,
								RgnHandle inHideRgn, Point inHideOrigin,
								DragReference inDragRef);
								
	virtual	void	InstallDragSendData(DragReference inDragRef);
	virtual	void	InstallDragInput(DragReference inDragRef);
	virtual	void	InstallDragDrawing(DragReference inDragRef);

	static pascal OSErr	HandleDragSendData(FlavorType inFlavor,
								void *inRefCon, ItemReference inItemRef,
								DragReference inDragRef);
								
	static pascal OSErr	HandleDragInput(Point *ioMouse, Int16 *ioModifiers,
								void *inRefCon, DragReference inDragRef);
								
	static pascal OSErr	HandleDragDrawing(DragRegionMessage inMessage,
								RgnHandle inShowRgn, Point inShowOrigin,
								RgnHandle inHideRgn, Point inHideOrigin,
								void *inRefCon, DragReference inDragRef);

protected:
			Rect	mLocalFrame;
};