emacs/oldXMenu/Locate.c

/* Copyright    Massachusetts Institute of Technology    1985	*/

/*

Copyright 1985, 1986, 1987 by the Massachusetts Institute of Technology

Permission to use, copy, modify, and distribute this
software and its documentation for any purpose and without
fee is hereby granted, provided that the above copyright
notice appear in all copies and that both that copyright
notice and this permission notice appear in supporting
documentation, and that the name of M.I.T. not be used in
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
M.I.T. makes no representations about the suitability of
this software for any purpose.  It is provided "as is"
without express or implied warranty.

*/




/*
 * XMenu:	MIT Project Athena, X Window system menu package
 *
 *	XMenuLocate - Return data necessary to position and locate
 *		      a menu on the screen.
 *
 *	Author:		Tony Della Fera, DEC
 *			January 11, 1985
 *
 */

#include "XMenuInt.h"

int
XMenuLocate(register Display *display, register XMenu *menu, int p_num, int s_num, int x_pos, int y_pos, int *ul_x, int *ul_y, int *width, int *height)
                              	/* Previously opened display. */
                         	/* Menu object being located. */
              			/* Active pane number. */
              			/* Active selection number. */
              			/* X coordinate of mouse active position. */
              			/* Y coordinate of mouse active position. */
              			/* Returned upper left menu X coordinate. */
              			/* Returned upper left menu Y coordinate. */
               			/* Returned menu width. */
                		/* Returned menu height. */
{
    register XMPane *p_ptr;	/* XMPane pointer. */
    register XMSelect *s_ptr;	/* XMSelect pointer. */

    /*
     * Are the position arguments positive?
     */
    if ((x_pos <= 0) || (y_pos <= 0)) {
	_XMErrorCode = XME_ARG_BOUNDS;
	return(XM_FAILURE);
    }

    /*
     * Find the right pane.
     */
    p_ptr = _XMGetPanePtr(menu, p_num);
    if (p_ptr == NULL) return(XM_FAILURE);

    /*
     * Find the right selection.
     */
      s_ptr = _XMGetSelectionPtr(p_ptr, s_num);

    /*
     * Check to see that the menu's dependencies have been
     * recomputed and are up to date.  If not, do it now.
     */
    if (menu->recompute) XMenuRecompute(display, menu);

    /*
     * Compute the new menu origin such that the active point lies
     * in the center of the desired active pane and selection.
     * This sets the values of ul_x and ul_y.
     */
    _XMTransToOrigin(display, menu, p_ptr, s_ptr, x_pos, y_pos, ul_x, ul_y);

    /*
     * Set remaining return argument values.
     */
    *width = menu->width;
    *height = menu->height;

    /*
     * Return successfully.
     */
    _XMErrorCode = XME_NO_ERROR;
    return(XM_SUCCESS);
}