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/*------------------------------------------------------------*/
/* */
/* Turbo Vision 1.0 */
/* Copyright (c) 1991 by Borland International */
/* */
/* Calc.cpp: TCalcDisplay member functions */
/* */
/*------------------------------------------------------------*/
/*
Modified by Salvador Eduardo Tropea <salvador@inti.gov.ar>
<set@ieee.org> <set@computer.org>
I ported it from TV 1.03.
SET: Added locale support for the decimal point.
*/
// SET: moved the standard headers before tv.h
#define Uses_string
#define Uses_stdlib
#define Uses_ctype
#define Uses_stdio // sprintf
#define Uses_nl_langinfo
#define Uses_TKeys
#define Uses_TKeys_Extended
#define Uses_TRect
#define Uses_TEvent
#define Uses_TButton
#define Uses_TKeys
#define Uses_TDrawBuffer
#define Uses_TStreamableClass
#define Uses_TStreamable
#define Uses_TView
#define Uses_TPalette // SET: added
#define Uses_TCalcDisplay
#include <tv.h>
#define cpCalcPalette "\x13"
TCalcDisplay::TCalcDisplay(TRect& r) : TView ( r )
{
options |= ofSelectable;
eventMask = (evKeyboard | evBroadcast);
number = new char[DISPLAYLEN];
clear();
}
TCalcDisplay::~TCalcDisplay()
{
DeleteArray(number);
}
TPalette& TCalcDisplay::getPalette() const
{
static TPalette palette( cpCalcPalette, sizeof(cpCalcPalette)-1 );
return palette;
}
void TCalcDisplay::handleEvent(TEvent& event)
{
// SET: Independent of the label
static char keys[]={'C','\x8','%','_','7','8','9','/','4','5','6',
'*','1','2','3','-','0','.','=','+'};
TView::handleEvent(event);
switch(event.what)
{
case evKeyboard:
calcKey(event.keyDown.charScan.charCode,event.keyDown.keyCode);
clearEvent(event);
break;
case evBroadcast:
if(event.message.command>=cmCalcButton &&
event.message.command<=cmCalcButton+19)
{
calcKey(keys[event.message.command-cmCalcButton],0);
clearEvent(event);
}
break;
}
}
void TCalcDisplay::draw()
{
char color = getColor(1);
int i;
TDrawBuffer buf;
i = size.x - strlen(number) - 2;
buf.moveChar(0, ' ', color, size.x);
buf.moveChar(i, sign, color, 1);
buf.moveStr(i+1, number, color);
writeLine(0, 0, size.x, 1, buf);
}
void TCalcDisplay::error()
{
status = csError;
strcpy(number, _("Error"));
sign = ' ';
}
void TCalcDisplay::clear()
{
status = csFirst;
strcpy(number, "0");
sign = ' ';
operate = '=';
}
void TCalcDisplay::setDisplay(double r)
{
int len;
char str[64];
//ostrstream displayStr( str, sizeof str );SET: Removed this waste
if(r < 0.0)
{
sign = '-';
sprintf(str,"%f",-r);
}
else
{
sprintf(str,"%f",r);
sign = ' ';
}
len = strlen(str) - 1; // Minus one so we can use as an index.
if(len > DISPLAYLEN)
error();
else
strcpy(number, str);
}
void TCalcDisplay::checkFirst()
{
if( status == csFirst)
{
status = csValid;
strcpy(number, "0");
sign = ' ';
}
}
void TCalcDisplay::calcKey(unsigned char key, unsigned code)
{
char stub[2] = " ";
double r;
char *decPoint=nl_langinfo(RADIXCHAR);
switch(code)
{
case kbBackSpace:
key=8;
break;
case kbEsc:
key=27;
break;
case kbEnter: // Added by Mike
key=13;
break;
}
key = (unsigned char)toupper(key);
if( status == csError && key != 'C')
key = ' ';
switch(key)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
checkFirst();
if (strlen(number) < 15)
{ // 15 is max visible display length
if (!strcmp(number, "0"))
number[0] = '\0';
stub[0] = key;
strcat(number, stub);
}
break;
case 8:
case 27:
int len;
checkFirst();
if( (len = strlen(number)) == 1 )
strcpy(number, "0");
else
number[len-1] = '\0';
break;
case '_': // +-
sign = (sign == ' ') ? '-' : ' ';
break;
case '.':
checkFirst();
if(strstr(number, decPoint) == NULL)
strcat(number, decPoint);
break;
case '+': case '-': case '*': case '/':
case '=': case '%': case 13:
if(status == csValid)
{
status = csFirst;
r = getDisplay() * ((sign == '-') ? -1.0 : 1.0);
if( key == '%' )
{
if(operate == '+' || operate == '-')
r = (operand * r) / 100;
else
r /= 100;
}
switch( operate )
{
case '+':
setDisplay(operand + r);
break;
case '-':
setDisplay(operand - r);
break;
case '*':
setDisplay(operand * r);
break;
case '/':
if(r == 0)
error();
else
setDisplay(operand / r);
break;
}
}
operate = key;
operand = getDisplay() * ((sign == '-') ? -1.0 : 1.0);
break;
case 'C':
clear();
break;
}
drawView();
}
#if !defined( NO_STREAM )
TStreamable *TCalcDisplay::build()
{
return new TCalcDisplay( streamableInit );
}
void TCalcDisplay::write( opstream& os )
{
TView::write( os );
os.writeBytes(&status, sizeof(status));
os.writeString(number);
os.writeByte(sign);
os.writeByte(operate);
os.writeBytes(&operand, sizeof(operand));
}
void *TCalcDisplay::read( ipstream& is )
{
TView::read( is );
number = new char[DISPLAYLEN];
is.readBytes(&status, sizeof(status));
is.readString(number, DISPLAYLEN);
sign = is.readByte();
operate = is.readByte();
is.readBytes(&operand, sizeof(operand));
return this;
}
#endif // NO_STREAM
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