// TextBuffer.h

// 

// Copyright (c) 2010 Accenture. All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

// 

// Initial Contributors:

// Accenture - Initial contribution

//

#ifndef __TEXTBUFFER_H__

#define __TEXTBUFFER_H__

#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000

#include "base.h"

class MTextBufferObserver

	{

public:

	virtual void HandleTextBufferChange(int aPosX, int aPosY, PTCHAR aPtr, int aLength) = 0;

	virtual void HandleTextBufferScroll() = 0;

	virtual void HandleTextBufferCursorChange() = 0;

	virtual void HandleTextBufferCleared() = 0;

	};

class CTextBuffer : public CBase

	{

public:

	static CTextBuffer* New(int aWidth, int aHeight, int aMaxNumOverflowLines);

	virtual ~CTextBuffer();

	void SetObserver(MTextBufferObserver* aObserver);

	void Write(LPCTSTR aString, int aLength);

	void GetCursorPos(int& aX, int& aY) const;

	void SetAbsCursorPos(int aX, int aY);

	void SetRelCursorPos(int aX, int aY);

	void GetSize(int& aWidth, int& aHeight) const;

	int NumOverflowLines() const;

	void Clear();

	void ClearToEndOfLine();

	LPCTSTR GetLine(int aPos) const;

	void CaptureToFile(LPCTSTR aFileName);

	void StopCaptureToFile();

	bool IsCapturingToFile() const;

private:

	CTextBuffer(int aWidth, int aHeight, int aMaxNumOverflowLines);

	void Construct();

	void MoveCursor(int aNewX, int aNewY);

	PTCHAR CursorPtr() const;

	PTCHAR LineEndPtr() const;

	PTCHAR BufEndPtr() const;

	void WriteSpecialChar(TCHAR aChar);

	void WriteBlock(LPCTSTR aString, int aLength);

	bool IsOrdinaryChar(TCHAR aChar) const;

	int NumCharsToLineEnd() const;

	void ClearBuffer();

	void CursorLeft();

	void CursorRight();

	void FormFeed();

	void LineFeed();

	void CarriageReturn();

	void BackSpace();

	void HorizontalTab();

	void ScrollUp();

	void WriteLineToCaptureFile(LPCTSTR aLinePtr);

	void WriteOverflowLinesToCaptureFile();

	void WriteBufferToCaptureFile();

private:

	MTextBufferObserver* iObserver;

	PTCHAR iBuffer;

	const int iWidth;

	const int iHeight;

	const int iMaxNumOverflowLines;

	int iNumOverflowLines;

	int iCursorPosX;

	int iCursorPosY;

	int iCaptureFile;

	};

#endif // __TEXTBUFFER_H__