/*
 *
 *  This file is part of the XForms library package.
 *
 * XForms is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1, or
 * (at your option) any later version.
 *
 * XForms is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with XForms; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 *
 */


/**
 * \file align.c
 *
 *.
 *  This file is part of the XForms library package.
 *  Copyright (c) 1996-2002  T.C. Zhao and Mark Overmars
 *  All rights reserved.
 *.
 *
 * Handles align requests
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "include/forms.h"
#include "flinternal.h"


/***************************************
 ***************************************/

void
fli_get_hv_align( int   align,
				  int * halign,
				  int * valign )
{
    align &= ~ FL_ALIGN_INSIDE;

    switch ( align )
    {
		case FL_ALIGN_LEFT:
			*halign = FL_ALIGN_LEFT;
			*valign = FL_ALIGN_CENTER;
			break;

		case FL_ALIGN_RIGHT:
			*halign = FL_ALIGN_RIGHT;
			*valign = FL_ALIGN_CENTER;
			break;

		case FL_ALIGN_CENTER:
			*halign = FL_ALIGN_CENTER;
			*valign = FL_ALIGN_CENTER;
			break;

		case FL_ALIGN_TOP:
			*halign = FL_ALIGN_CENTER;
			*valign = FL_ALIGN_TOP;
			break;

		case FL_ALIGN_BOTTOM:
			*halign = FL_ALIGN_CENTER;
			*valign = FL_ALIGN_BOTTOM;
			break;

		case FL_ALIGN_LEFT_BOTTOM:
			*halign = FL_ALIGN_LEFT;
			*valign = FL_ALIGN_BOTTOM;
			break;

		case FL_ALIGN_RIGHT_BOTTOM:
			*halign = FL_ALIGN_RIGHT;
			*valign = FL_ALIGN_BOTTOM;
			break;

		case FL_ALIGN_LEFT_TOP:
			*halign = FL_ALIGN_LEFT;
			*valign = FL_ALIGN_TOP;
			break;

		case FL_ALIGN_RIGHT_TOP:
			*halign = FL_ALIGN_RIGHT;
			*valign = FL_ALIGN_TOP;
			break;

		default:
			M_err( "fli_get_hv_align", "bad request: %d\n", align );
			*halign = FL_ALIGN_CENTER;
			*valign = FL_ALIGN_CENTER;
			break;
    }
}


/***************************************
 ***************************************/

void
fli_get_outside_align( int   align,
					   int   x,
					   int   y,
					   int   w,
					   int   h,
					   int * new_align,
					   int * newx,
					   int * newy )
{
    *newx = x;
    *newy = y;
    *new_align = FL_ALIGN_CENTER;

    align &= ~ FL_ALIGN_INSIDE;

	switch ( align )
	{
		case FL_ALIGN_LEFT:
			*new_align = FL_ALIGN_RIGHT;
			*newx = x - w;
			break;

		case FL_ALIGN_RIGHT:
			*new_align = FL_ALIGN_LEFT;
			*newx = x + w;
			break;

		case FL_ALIGN_TOP:
			*new_align = FL_ALIGN_BOTTOM;
			*newy = y - h;
			break;


		case FL_ALIGN_BOTTOM:
			*new_align = FL_ALIGN_TOP;
			*newy = y + h;
			break;

		case FL_ALIGN_LEFT_TOP:
			*new_align = FL_ALIGN_LEFT_BOTTOM;
			*newy = y - h;
			break;

		case FL_ALIGN_RIGHT_TOP:

			*new_align = FL_ALIGN_RIGHT_BOTTOM;
			*newy = y - h;
			break;

		case FL_ALIGN_LEFT_BOTTOM:
			*new_align = FL_ALIGN_LEFT_TOP;
			*newy = y + h;
			break;

		case FL_ALIGN_RIGHT_BOTTOM:
			*new_align = FL_ALIGN_RIGHT_TOP;
			*newy = y + h;
			break;
	}
}


/***************************************
 ***************************************/

static void
get_align_inside( int   align,
				  int   x,
				  int   y,
				  int   w,
				  int   h,
				  int   xsize,
				  int   ysize,
				  int   xoff,
				  int   yoff,
				  int * xx,
				  int * yy )
{
    int hor, vert;

    fli_get_hv_align( align, &hor, &vert );

    x += xoff;
    y += yoff;
    w -= 2 * xoff;
    h -= 2 * yoff;

    switch ( hor )
    {
		case FL_ALIGN_LEFT:
			*xx = x;
			break;

		case FL_ALIGN_RIGHT:
			*xx = x + w - xsize;
			break;

		case FL_ALIGN_CENTER:
		default:
			*xx = x + ( w - xsize ) / 2;
			break;
    }

    switch ( vert )
    {
		case FL_ALIGN_TOP:
			*yy = y;
			break;

		case FL_ALIGN_BOTTOM:
			*yy = y + h - ysize;
			break;

		case FL_ALIGN_CENTER:
		default:
			*yy = y + ( h - ysize ) / 2;
			break;
    }
}


/***************************************
 ***************************************/

static void
get_align_outside( int   align,
				   int   x,
				   int   y,
				   int   w,
				   int   h,
				   int   xsize,
				   int   ysize,
				   int   xoff,
				   int   yoff,
				   int * xx,
				   int * yy )
{
    int newx, newy, new_align;

    fli_get_outside_align( align, x, y, w, h, &new_align, &newx, &newy );
    get_align_inside( new_align, newx, newy, w, h,
					  xsize, ysize, xoff, yoff, xx, yy );
}


/***************************************
 ***************************************/

void
fl_get_align_xy( int   align,
				 int   x,
				 int   y,
				 int   w,
				 int   h,
				 int   xsize,
				 int   ysize,
				 int   xoff,
				 int   yoff,
				 int * xx,
				 int * yy )
{
    ( ( align & FL_ALIGN_INSIDE ) ? get_align_inside : get_align_outside )
		( align, x, y, w, h, xsize, ysize, xoff, yoff, xx, yy );
}
