#ifndef _c_Text_Drag_And_Drop_Attachment_h
#define _c_Text_Drag_And_Drop_Attachment_h

	// ===========================================================================
	//	cTextDragAndDropAttachment.h	   Version 1.3.3	©1998 Joakim Braun All rights reserved.
	// ===========================================================================
	//
	//	CONTENTS:		Various LAttachment subclasses that add drag and drop behavior to LTextEditViews,
	//			LEditFields and LEditTexts. Supports drag and drop of text as well as of text files.
	//			See cTextDragAndDropAttachment.cpp for details.

	//	cTextDragAndDropAttachment is free for any and all use,
	//	though I wouldn't mind receiving a free, enabled copy of any app that uses it.
	//	Do not distribute modified source code under my name.

	//	No support promised, no liability accepted. Provided "as is". 
	//	That said, I can be reached at braun@swipnet.se.
	//	Latest version of this and more at http://home4.swipnet.se/~w-41308/

	#include <LAttachment.h>
	#include <LDragAndDrop.h>
	#include <LDragTask.h>
	#include <LTextEditView.h>
	#include <LEditField.h>
	#include <LEditText.h>
	#include <LAction.h>
	
	class cTextEditDragTask;
	
	class cTextDragAndDropAttachment : public LAttachment, public LDragAndDrop{
			
		public:
			
			enum { 	class_ID = 'ddBs'	};
			
			cTextDragAndDropAttachment(		Boolean inAllowTextFileDropping,
							Boolean inAcceptStyleData,
							ResIDT inCopyDragCursorID, 
							PaneIDT inDropHilitePaneID,
							Boolean inDoCustomHiliting,
							Int16 inCustomHiliteInset);
			
			cTextDragAndDropAttachment(LStream *inStream);
			
			virtual ~cTextDragAndDropAttachment(void){}
			
			// Globally switch on or off drag and drop for these attachments
			static void SetDragEnable(Boolean inEnableDragAndDrop){ sAllowDragAndDrop = inEnableDragAndDrop; }
			static Boolean GetDragEnable(void){ return sAllowDragAndDrop; }
			
			virtual void MakeDragRegion(RgnHandle outValidRgn);
			virtual void AddDragFlavors( DragReference inDragRef);
			
			virtual void SetOwnerHost(LAttachable* inHost);
			
			// LDragAndDrop overrides
			virtual void HiliteDropArea( DragReference inDragRef);
			virtual void UnhiliteDropArea( DragReference inDragRef);
			virtual void DoDragReceive( DragReference inDragRef);
			virtual void EnterDropArea( DragReference inDragRef, Boolean inDragHasLeftSender);
			virtual void InsideDropArea( DragReference inDragRef);
			virtual void LeaveDropArea( DragReference inDragRef);		
			virtual void ReceiveDragItem( 	DragReference inDragRef,
						DragAttributes inDragAttrs,
						ItemReference inItemRef,
						Rect &inItemBounds);
			virtual Boolean ItemIsAcceptable( DragReference inDragRef, ItemReference inItemRef);
									
		protected:
			enum { 	eTextDragItemFlavor 	= 'TEXT',
				eStyleDragItemFlavor	= 'styl' };
				
			enum { 	eDragCaretDrawn,
				eDragCaretNotDrawn,
				eDragCaretBadOffset	= -1	};
				
			static Boolean		sAllowDragAndDrop;
			
			Int16			mLastDragCaretOffset,
						mDragCaretState,
						mCustomHiliteInset;
						
			UInt32			mLastDragCaretTime;
			
			Boolean			mAllowTextFileDropping,
						mAcceptStyleData,
						mDoCustomHiliting;
						
			ResIDT			mCopyDragCursorID;
			
			PaneIDT 			mDropHilitePaneID;
			
			cTextEditDragTask*		mCurrDragTask;
			
			LPane*			mTextEditPane;
									
			virtual void	ExecuteSelf( 	MessageT		inMessage,
							void			*ioParam);
			
			void GetTextDropData( DragReference inDragRef, ItemReference inItemRef, Handle& outNewText, StScrpHandle& outNewStyles);
			virtual void ReceiveDroppedText(char* inText, Int16 inTextLength, StScrpHandle inStyles) {}
			
			virtual Boolean AdjustCursor(EventRecord &inMacEvent);
			virtual void AdjustDragCursor(DragReference inDragRef);
			virtual void UpdateDragCaret(DragReference inDragRef);
			virtual void DrawDragCaret(Int16 inOffset);
			
			virtual void GetTEHiliteRgn(RgnHandle outValidRgn);
			virtual RgnHandle GetDropHiliteRgn( DragReference inDragRef);
			virtual void DeleteDraggedSelection(void){}
						
			Boolean CheckForOptionKey(DragReference inDragRef);
			Int16 GetLineFromOffset(Int16 inOffset, TEHandle inTEhandle);
			virtual Boolean PointInTEHiliteRgn(Point inWhereLocal);
			
			virtual TEHandle GetMacTEH(void){ return NULL; }
			StScrpHandle MakePhonyStScrpHandle(TEHandle inMonostyledTEhandle);
			
			LPane*	GetDropPane(void);
			
			friend class cTextEditDropAction;
	};

	//******************************************************************

	class cTextEditViewDDattachment : public cTextDragAndDropAttachment{
		
		public:
			enum { 	class_ID = 'ddTV'	};
				
			cTextEditViewDDattachment(		Boolean inAllowTextFileDropping,
							Boolean inAcceptStyleData,
							ResIDT inCopyDragCursorID, 
							PaneIDT inDropHilitePaneID,
							Boolean inDoCustomHiliting,
							Int16 inCustomHiliteInset);
			
			cTextEditViewDDattachment(LStream *inStream);
			
			virtual ~cTextEditViewDDattachment(void){}
			
			virtual void SetOwnerHost(LAttachable* inHost);
	
			virtual void MakeDragRegion(RgnHandle outValidRgn);
			virtual void AddDragFlavors( DragReference inDragRef);
			
			virtual Boolean ItemIsAcceptable( DragReference inDragRef, ItemReference inItemRef);
			
		protected:
			LTextEditView*	mTEview;
			
			
			virtual void  ReceiveDroppedText(char* inText, Int16 inTextLength, StScrpHandle inStyles);
			
			virtual TEHandle GetMacTEH(void);
			virtual void DeleteDraggedSelection(void);
			virtual Boolean PointInTEHiliteRgn(Point inWhereLocal);
	};

	//******************************************************************

	class cEditFieldDDattachment : public cTextDragAndDropAttachment{
		
		public:
			enum { 	class_ID = 'ddED'	};
			
			cEditFieldDDattachment(		Boolean inAllowTextFileDropping,
							Boolean inAcceptStyleData,
							ResIDT inCopyDragCursorID, 
							PaneIDT inDropHilitePaneID,
							Boolean inDoCustomHiliting,
							Int16 inCustomHiliteInset);
			
			cEditFieldDDattachment(LStream *inStream);
			
			virtual ~cEditFieldDDattachment(void){}
			
			virtual void SetOwnerHost(LAttachable* inHost);
								
		protected:
			LEditField*	mEditField;
			
			virtual TEHandle GetMacTEH(void);
			virtual void DeleteDraggedSelection(void);
			
			virtual void  ReceiveDroppedText(char* inText, Int16 inTextLength, StScrpHandle inStyles);
			
	};
	
	//******************************************************************

	class cEditTextDDattachment : public cTextDragAndDropAttachment{
		
		public:
			enum { 	class_ID = 'ddEt'	};
			
			cEditTextDDattachment(		Boolean inAllowTextFileDropping,
							Boolean inAcceptStyleData,
							ResIDT inCopyDragCursorID, 
							PaneIDT inDropHilitePaneID,
							Boolean inDoCustomHiliting,
							Int16 inCustomHiliteInset);
			
			cEditTextDDattachment(LStream *inStream);
			
			virtual ~cEditTextDDattachment(void){}
			
			virtual void SetOwnerHost(LAttachable* inHost);
								
		protected:
			LEditText*	mEditText;
			
			virtual TEHandle GetMacTEH(void);
			virtual void DeleteDraggedSelection(void);
						
			virtual void  ReceiveDroppedText(char* inText, Int16 inTextLength, StScrpHandle inStyles);
			
	};

	//******************************************************************

	class cSmartTextDDAttachment : public cTextDragAndDropAttachment{
		
		public:
				
			enum { 	class_ID = 'ddAt'	};
			
			cSmartTextDDAttachment(	Boolean inAllowTextFileDropping,
							Boolean inAcceptStyleData,
							ResIDT inCopyDragCursorID, 
							PaneIDT inDropHilitePaneID,
							Boolean inDoCustomHiliting,
							Int16 inTextEditViewCustomHiliteInset = 1,
							Int16 inEditFieldCustomHiliteInset = 1,
							Int16 inEditTextCustomHiliteInset = 3);
			
			cSmartTextDDAttachment(LStream *inStream);
			cSmartTextDDAttachment(LStream *inStream, Boolean inDummy);
			
			virtual ~cSmartTextDDAttachment(void){}
			
			virtual void SetOwnerHost(LAttachable* inHost);
						
		protected:
			Int16	mTextEditViewCustomHiliteInset,
				mEditFieldCustomHiliteInset,
				mEditTextCustomHiliteInset;
				
			void AddDragAndDropAttachment(LAttachable* inAttachable);
	};
	
	//******************************************************************

	class cViewTextDDAttachment : public cSmartTextDDAttachment{
		
		public:
				
			enum { 	class_ID = 'ddVw'	};
			
			cViewTextDDAttachment(	Boolean inAllowTextFileDropping,
							Boolean inAcceptStyleData,
							ResIDT inCopyDragCursorID, 
							PaneIDT inDropHilitePaneID,
							Boolean inDoCustomHiliting);
			
			cViewTextDDAttachment(LStream *inStream);
			
			virtual ~cViewTextDDAttachment(void){}
			
			virtual void SetOwnerHost(LAttachable* inHost);
												
		protected:
			void AddDragAndDropToView(LView* inView);
			
			virtual void ExecuteSelf(MessageT inMessage, void* ioParam);	
	};


	//**************************************************************************

	class cTextEditDragTask : public LDragTask{
		
		public:
			cTextEditDragTask(cTextDragAndDropAttachment* inDragAndDrop, const SMouseDownEvent &inMouseDown);			
			
		protected:
			cTextDragAndDropAttachment*	mDDAttachment;
			
			virtual void	AddFlavors( DragReference inDragRef);
			virtual void	MakeDragRegion( DragReference inDragRef, RgnHandle inDragRegion);
	};


	//**************************************************************************

	class cSavedTextEditState{
		
		public:
			// inNewOwner must be either LTextEditView or LEditField
			cSavedTextEditState(LPane* inNewOwner, Boolean inSaveState = true);	
			
			~cSavedTextEditState(void);
			
			void SaveState(void);
			void RestoreState(void);	
		
		protected:
			LTextEditView*	mTEview;
			LEditField*	mEditField;
			LEditText*		mEditText;
			
			Handle		mSavedText;
			StScrpHandle	mSavedStyles;
			Int16		mSavedSelStart,
					mSavedSelEnd;
					
			void RestoreTEViewState(void);
			void RestoreEditFieldState(void);
			void RestoreEditTextState(void);
			
			void	DisposeData(void);
			TEHandle	GetMacTEH(void);
			
	};

	//**************************************************************************

	class cTextEditDropAction : public LAction{
		
		public:
			cTextEditDropAction(cTextDragAndDropAttachment* inNewOwner, DragReference inDragRef);
			
			virtual ~cTextEditDropAction(void){}
				
		protected:
			
			cTextDragAndDropAttachment*	mOwner;
			DragReference		mDragRef;
			cSavedTextEditState		mSavedUndroppedState,
						mSavedDroppedState;
			
			virtual void		RedoSelf();
			virtual void		UndoSelf();
	};
	
#endif