// textview.h

// 

// Copyright (c) 2009 - 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 TEXTVIEW_H_

#define TEXTVIEW_H_

#include <e32base.h>

#include "viewbase.h"

class CColorConsoleBase;

class CFileBuffer;

/*

 Main parent class for all views able to show any texts on the screen using data read/written from/to the universal

 memory buffer CFileBuffer (unicode, left-to-right, right-to-left, up-to-down), etc.

*/

class CTextView : public CFedViewBase

{

protected:

	CTextView(MConsoleProvider& aConsoleProvider, CFedBufferBase& aBuffer, TInt aPriority = CActive::EPriorityStandard);

	void ConstructL();

	~CTextView();

public:

	//CActive

	void DoCancel();

	void RunL();

	TInt RunError(TInt aError);

	void ResizeL(const TWindow& aWindow);

	void RedrawL(const TWindow& aWindow);

	void DeactivateL();

	//MSharedCacheClient

	void InvalidateBuffer(TRequestStatus& aStatus);

	CFedBufferBase& Buffer();

protected:

	void RequestData(TBool aFromTheTop, TInt aOffset);

	void SeekData(TInt aDocumentPosition, TInt aNumLines);

	virtual void UpdateCursor(const TPoint& aNewPos);

	virtual void ValidateCursor();

	void ShowCursor();

	void HideCursor();

	void HandleDataLoadError(TInt aError);

protected:

	virtual void DoResizeL(const TWindow& aOldWindow) = 0;

	virtual void DoRedrawL() = 0;

	virtual void DoDrawL() = 0;

private:

	enum TState

		{

		EStateNone,

		EStateGetData,

		} iState;

	//member variables to use by inheriting classes

protected:

	CFedBufferBase& iBuffer;

	TPtrC16 iDes;		// This is set to whatever cache block is currently active	

	TBool iActive;		// Whether the view is active and can draw on the screen or not

	TPoint iCursor;		// Current position of cursor on the screen (in window coords, NOT console coords)

	TPoint iDrawPoint;	// Current position of drawing new characters on the screen (in console coordinates)

	RBuf iLine;			// Temp buffer for chars to be drawn on the screen

	TRange iRange;		// Document range of last fetched data (iDes)

	TInt iRangeStartLineNumber; // Line number for the first character of iRange

};

#endif /*TEXTVIEW_H_*/