wresize.c   [plain text]

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/****************************************************************************
 *  Author: Thomas E. Dickey <dickey@clark.net> 1996,1997                   *
 ****************************************************************************/

#include <curses.priv.h>

MODULE_ID("$Id: wresize.c,v 1.1.1.2 2002/01/03 23:53:42 jevans Exp $")

/*
 * Reallocate a curses WINDOW struct to either shrink or grow to the specified
 * new lines/columns.  If it grows, the new character cells are filled with
 * blanks.  The application is responsible for repainting the blank area.
 */

#define DOALLOC(p,t,n)  typeRealloc(t, n, p)
#define	ld_ALLOC(p,n)	DOALLOC(p,struct ldat,n)
#define	c_ALLOC(p,n)	DOALLOC(p,NCURSES_CH_T,n)

NCURSES_EXPORT(int)
wresize(WINDOW *win, int ToLines, int ToCols)
{
    register int row;
    int size_x, size_y;
    struct ldat *pline;
    NCURSES_CH_T blank;

#ifdef TRACE
    T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
    if (win) {
	TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
			  win->_begy, win->_begx,
			  win->_maxy, win->_maxx,
			  win->_regtop, win->_regbottom));
	if (_nc_tracing & TRACE_UPDATE)
	    _tracedump("...before", win);
    }
#endif

    if (!win || --ToLines < 0 || --ToCols < 0)
	returnCode(ERR);

    size_x = win->_maxx;
    size_y = win->_maxy;

    if (ToLines == size_y
	&& ToCols == size_x)
	returnCode(OK);

    if ((win->_flags & _SUBWIN)) {
	/*
	 * Check if the new limits will fit into the parent window's size.  If
	 * not, do not resize.  We could adjust the location of the subwindow,
	 * but the application may not like that.
	 */
	if (win->_pary + ToLines > win->_parent->_maxy
	    || win->_parx + ToCols > win->_parent->_maxx) {
	    returnCode(ERR);
	}
	pline = win->_parent->_line;
    } else {
	pline = 0;
    }

    /*
     * If the number of lines has changed, adjust the size of the overall
     * vector:
     */
    if (ToLines != size_y) {
	if (!(win->_flags & _SUBWIN)) {
	    for (row = ToLines + 1; row <= size_y; row++)
		free((char *) (win->_line[row].text));
	}

	win->_line = ld_ALLOC(win->_line, ToLines + 1);
	if (win->_line == 0)
	    returnCode(ERR);

	for (row = size_y + 1; row <= ToLines; row++) {
	    win->_line[row].text = 0;
	    win->_line[row].firstchar = 0;
	    win->_line[row].lastchar = ToCols;
	    if ((win->_flags & _SUBWIN)) {
		win->_line[row].text =
		    &pline[win->_pary + row].text[win->_parx];
	    }
	}
    }

    /*
     * Adjust the width of the columns:
     */
    blank = win->_nc_bkgd;
    for (row = 0; row <= ToLines; row++) {
	NCURSES_CH_T *s = win->_line[row].text;
	int begin = (s == 0) ? 0 : size_x + 1;
	int end = ToCols;

	if_USE_SCROLL_HINTS(win->_line[row].oldindex = row);

	if (ToCols != size_x || s == 0) {
	    if (!(win->_flags & _SUBWIN)) {
		win->_line[row].text = s = c_ALLOC(s, ToCols + 1);
		if (win->_line[row].text == 0)
		    returnCode(ERR);
	    } else if (s == 0) {
		win->_line[row].text = s =
		    &pline[win->_pary + row].text[win->_parx];
	    }

	    if (end >= begin) {	/* growing */
		if (win->_line[row].firstchar < begin)
		    win->_line[row].firstchar = begin;
		win->_line[row].lastchar = ToCols;
		do {
		    s[end] = blank;
		} while (--end >= begin);
	    } else {		/* shrinking */
		win->_line[row].firstchar = 0;
		win->_line[row].lastchar = ToCols;
	    }
	}
    }

    /*
     * Finally, adjust the parameters showing screen size and cursor
     * position:
     */
    win->_maxx = ToCols;
    win->_maxy = ToLines;

    if (win->_regtop > win->_maxy)
	win->_regtop = win->_maxy;
    if (win->_regbottom > win->_maxy
	|| win->_regbottom == size_y)
	win->_regbottom = win->_maxy;

    if (win->_curx > win->_maxx)
	win->_curx = win->_maxx;
    if (win->_cury > win->_maxy)
	win->_cury = win->_maxy;

#ifdef TRACE
    TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
		      win->_begy, win->_begx,
		      win->_maxy, win->_maxx,
		      win->_regtop, win->_regbottom));
    if (_nc_tracing & TRACE_UPDATE)
	_tracedump("...after:", win);
#endif
    returnCode(OK);
}