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/***************************************************************************
* COPYRIGHT NOTICE *
****************************************************************************
* ncurses is copyright (C) 1992-1995 *
* Zeyd M. Ben-Halim *
* zmbenhal@netcom.com *
* Eric S. Raymond *
* esr@snark.thyrsus.com *
* *
* Permission is hereby granted to reproduce and distribute ncurses *
* by any means and for any fee, whether alone or as part of a *
* larger distribution, in source or in binary form, PROVIDED *
* this notice is included with any such distribution, and is not *
* removed from any of its header files. Mention of ncurses in any *
* applications linked with it is highly appreciated. *
* *
* ncurses comes AS IS with no warranty, implied or expressed. *
* *
***************************************************************************/
#include "form.priv.h"
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : bool data_behind(const FORM *form)
|
| Description : Check for off-screen data behind. This is nearly trivial
| becose the begin of a field is fixed.
|
| Return Values : TRUE - there are off-screen data behind
| FALSE - there are no off-screen data behind
+--------------------------------------------------------------------------*/
bool data_behind(const FORM *form)
{
bool result = FALSE;
if (form && (form->status & _POSTED) && form->current)
{
FIELD *field;
field = form->current;
if (!Single_Line_Field(field))
{
result = (form->toprow==0) ? FALSE : TRUE;
}
else
{
result = (form->begincol==0) ? FALSE : TRUE;
}
}
return(result);
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static char * After_Last_Non_Pad_Position(
| char *buffer,
| int len,
| int pad)
|
| Description : Find the last position in the buffer that doesn't
| contain a padding character.
|
| Return Values : The pointer to this position
+--------------------------------------------------------------------------*/
INLINE
static char * After_Last_Non_Pad_Position(char *buffer, int len, int pad)
{
char *end = buffer + len;
assert(buffer && len>=0);
while ( (buffer < end) && (*(end-1)==pad) )
end--;
return end;
}
#define SMALL_BUFFER_SIZE (80)
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : bool data_ahead(const FORM *form)
|
| Description : Check for off-screen data ahead. This is more difficult
| because a dynamic field has a variable end.
|
| Return Values : TRUE - there are off-screen data ahead
| FALSE - there are no off-screen data ahead
+--------------------------------------------------------------------------*/
bool data_ahead(const FORM *form)
{
bool result = FALSE;
if (form && (form->status & _POSTED) && form->current)
{
static char buffer[SMALL_BUFFER_SIZE + 1];
FIELD *field;
bool large_buffer;
bool cursor_moved = FALSE;
char *bp;
char *found_content;
int pos;
field = form->current;
assert(form->w);
large_buffer = (field->cols > SMALL_BUFFER_SIZE);
if (large_buffer)
bp = (char *)malloc((size_t)(field->cols) + 1);
else
bp = buffer;
assert(bp);
if (Single_Line_Field(field))
{
int check_len;
pos = form->begincol + field->cols;
while (pos < field->dcols)
{
check_len = field->dcols - pos;
if ( check_len >= field->cols )
check_len = field->cols;
cursor_moved = TRUE;
wmove(form->w,0,pos);
winnstr(form->w,bp,check_len);
found_content =
After_Last_Non_Pad_Position(bp,check_len,field->pad);
if (found_content==bp)
pos += field->cols;
else
{
result = TRUE;
break;
}
}
}
else
{
pos = form->toprow + field->rows;
while (pos < field->drows)
{
cursor_moved = TRUE;
wmove(form->w,pos,0);
pos++;
winnstr(form->w,bp,field->cols);
found_content =
After_Last_Non_Pad_Position(bp,field->cols,field->pad);
if (found_content!=bp)
{
result = TRUE;
break;
}
}
}
if (large_buffer)
free(bp);
if (cursor_moved)
wmove(form->w,form->currow,form->curcol);
}
return(result);
}
/* frm_data.c ends here */
|
