oldXMenu/Locate.c

   1 /* Copyright    Massachusetts Institute of Technology    1985   */
   2
   3 #include "copyright.h"
   4
   5
   6 /*
   7  * XMenu:       MIT Project Athena, X Window system menu package
   8  *
   9  *      XMenuLocate - Return data necessary to position and locate
  10  *                    a menu on the screen.
  11  *
  12  *      Author:         Tony Della Fera, DEC
  13  *                      January 11, 1985
  14  *
  15  */
  16
  17 #include "XMenuInt.h"
  18
  19 int
  20 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)
  21                                 /* Previously opened display. */
  22                                 /* Menu object being located. */
  23                                 /* Active pane number. */
  24                                 /* Active selection number. */
  25                                 /* X coordinate of mouse active position. */
  26                                 /* Y coordinate of mouse active position. */
  27                                 /* Returned upper left menu X coordinate. */
  28                                 /* Returned upper left menu Y coordinate. */
  29                                 /* Returned menu width. */
  30                                 /* Returned menu height. */
  31 {
  32     register XMPane *p_ptr;     /* XMPane pointer. */
  33     register XMSelect *s_ptr;   /* XMSelect pointer. */
  34
  35     /*
  36      * Are the position arguments positive?
  37      */
  38     if ((x_pos <= 0) || (y_pos <= 0)) {
  39         _XMErrorCode = XME_ARG_BOUNDS;
  40         return(XM_FAILURE);
  41     }
  42
  43     /*
  44      * Find the right pane.
  45      */
  46     p_ptr = _XMGetPanePtr(menu, p_num);
  47     if (p_ptr == NULL) return(XM_FAILURE);
  48
  49     /*
  50      * Find the right selection.
  51      */
  52       s_ptr = _XMGetSelectionPtr(p_ptr, s_num);
  53
  54     /*
  55      * Check to see that the menu's dependencies have been
  56      * recomputed and are up to date.  If not, do it now.
  57      */
  58     if (menu->recompute) XMenuRecompute(display, menu);
  59
  60     /*
  61      * Compute the new menu origin such that the active point lies
  62      * in the center of the desired active pane and selection.
  63      * This sets the values of ul_x and ul_y.
  64      */
  65     _XMTransToOrigin(display, menu, p_ptr, s_ptr, x_pos, y_pos, ul_x, ul_y);
  66
  67     /*
  68      * Set remaining return argument values.
  69      */
  70     *width = menu->width;
  71     *height = menu->height;
  72
  73     /*
  74      * Return successfully.
  75      */
  76     _XMErrorCode = XME_NO_ERROR;
  77     return(XM_SUCCESS);
  78 }
  79