/* ------------------------------------------------------------------------*/
/*                                                                         */
/*   TEXTVIEW.H                                                            */
/*                                                                         */
/*   Copyright (c) Borland International 1991                              */
/*   All Rights Reserved.                                                  */
/*                                                                         */
/*   defines the classes TTextDevice and TTerminal                         */
/*                                                                         */
/* ------------------------------------------------------------------------*/

#include <tvvo.h>

#if defined( Uses_TTextDevice ) && !defined( __TTextDevice )
#define __TTextDevice

#if !defined(NO_TV_STREAMS)
#include <iostream.h>
#else
#include <stdio.h>
#endif

#include <tvvo.h>

class far TRect;
class far TScrollBar;

#if !defined(NO_TV_STREAMS)
class TTextDevice : public streambuf, public TScroller
#else
class TTextDevice : public TScroller
#endif
{

public:

    TTextDevice( const TRect& bounds,
                 TScrollBar *aHScrollBar,
                 TScrollBar *aVScrollBar
               );

    virtual int do_sputn( const char *s, int count ) = 0;
#if defined(__OS2__) && defined(__BORLANDC__)
    virtual int _RTLENTRY overflow(int = EOF); // flush buffer and make more room
#else
    virtual int TV_CDECL overflow( int = EOF );
#endif
#if defined(__WATCOMC__)
    virtual int underflow(void) { return 0; }
#endif

};

#endif  // Uses_TTextDevice

#if defined( Uses_TTerminal ) && !defined( __TTerminal )
#define __TTerminal

class far TRect;
class far TScrollBar;

class TTerminal: public TTextDevice
{

public:

    friend void genRefs();

    TTerminal( const TRect& bounds,
               TScrollBar *aHScrollBar,
               TScrollBar *aVScrollBar,
               size_t aBufSize
             );
    ~TTerminal();

    virtual int do_sputn( const char *s, int count );

    void bufInc( size_t& val );
    Boolean canInsert( size_t amount );
    virtual void draw();
    size_t nextLine( size_t pos );
    size_t TV_CDECL prevLines( size_t pos, int lines );
    Boolean queEmpty();

protected:

    size_t bufSize;
    char *buffer;
    size_t queFront, queBack;
    void bufDec(size_t& val);
};

#endif  // Uses_TTerminal

#if defined( Uses_otstream ) && !defined( __otstream )
#define __otstream

#include <tvvo.h>

#if !defined(NO_TV_STREAMS)
class otstream : public ostream
{

public:

    otstream( TTerminal * );

};
#else

class otstream
{
private:
  TTerminal *tty;

public:
    otstream( TTerminal *tt) { tty = tt; }

    otstream& operator<<(char const *str);
    otstream& operator<<(unsigned char const *str) { return(*this << (char const *)str); }
    otstream& operator<<(char c);
    otstream& operator<<(unsigned char uc) { return(*this << (char)uc); }
};
#endif

#endif

#include <tvvo2.h>