// =================================================================================
//	CDragTask.h				©1995 J. Rodden, DD/MF & Associates. All rights reserved
// =================================================================================
// You do not need to inherit this class.
//
// LDragTask gives us general drag functionality and behaviour.  CDragTask exists so
// that we can add behaviour specific to dragging our items without having to inherit
// from LDragTask anymore.
//
// CDragTask actually acts as a stub object, it passes the work onto the object being
// dragged so that all drag manager code can be isolated in the object being dragged
// or its owner and you don't ever have to deal with an LDragTask again.
//
// By using CDragTask and overriding AddFlavors and MakeDragRegion in the object 
// being dragged, 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.
// =================================================================================

#include "CDragTask.h"
#include "CDragItem.h"

// =================================================================================
//		€ CDragTask
// =================================================================================

CDragTask::CDragTask(
	const EventRecord	&inEventRecord,
	CDragItem*			inDragItem)
	
	: LDragTask(inEventRecord),
	  dragItem(inDragItem)
{
}


// =================================================================================
//		€ CDragTask
// =================================================================================

CDragTask::CDragTask (
	const EventRecord&	inEventRecord,
	const Rect*			inItemRect,
	ItemReference		inItemRef,
	CDragItem*			inDragItem)

	: LDragTask(inEventRecord),
	  dragItem(inDragItem)
{
	if ( inItemRect != nil ) {				// optionally provide default drag outline
		Rect	globalRect = *inItemRect;
	  ::LocalToGlobal(&topLeft(globalRect));
	  ::LocalToGlobal(&botRight(globalRect));
		AddRectDragItem(inItemRef, globalRect);
	}
}


// =================================================================================
//		€ AddFlavors
// =================================================================================
// Let the object being dragged add the drag flavors.

void
CDragTask::AddFlavors (DragReference inDragRef)
{
	if (dragItem) dragItem->AddFlavors(inDragRef);
}


// =================================================================================
//		€ MakeDragRegion
// =================================================================================
// Let the object being dragged make the drag region.

void
CDragTask::MakeDragRegion( DragReference inDragRef, RgnHandle inDragRegion)
{
	if (dragItem) dragItem->MakeDragRegion(inDragRef,inDragRegion);
}


// =================================================================================
//		€ InstallDragSendData
// =================================================================================
// Let the object being dragged override default DragSendData behavior.

void
CDragTask::InstallDragSendData()
{
	if (dragItem) dragItem->InstallDragSendData(mDragRef);
}


// =================================================================================
//		€ InstallDragInput
// =================================================================================
// Let the object being dragged override default DragInput behavior.

void
CDragTask::InstallDragInput()
{
	if (dragItem) dragItem->InstallDragInput(mDragRef);
}


// =================================================================================
//		€ InstallDragDrawing
// =================================================================================
// Let the object being dragged override default DragDrawing behavior.

void
CDragTask::InstallDragDrawing()
{
	if (dragItem) dragItem->InstallDragDrawing(mDragRef);
}