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28
29/****************************************************************************
30 *   Author:  Juergen Pfeifer, 1995,1997                                    *
31 ****************************************************************************/
32
33/***************************************************************************
34* Module m_format                                                          *
35* Set and get maximum numbers of rows and columns in menus                 *
36***************************************************************************/
37
38#include "menu.priv.h"
39
40MODULE_ID("$Id: m_format.c,v 1.15 2004/12/11 23:11:21 tom Exp $")
41
42#define minimum(a,b) ((a)<(b) ? (a): (b))
43
44/*---------------------------------------------------------------------------
45|   Facility      :  libnmenu
46|   Function      :  int set_menu_format(MENU *menu, int rows, int cols)
47|
48|   Description   :  Sets the maximum number of rows and columns of items
49|                    that may be displayed at one time on a menu. If the
50|                    menu contains more items than can be displayed at
51|                    once, the menu will be scrollable.
52|
53|   Return Values :  E_OK                   - success
54|                    E_BAD_ARGUMENT         - invalid values passed
55|                    E_NOT_CONNECTED        - there are no items connected
56|                    E_POSTED               - the menu is already posted
57+--------------------------------------------------------------------------*/
58NCURSES_EXPORT(int)
59set_menu_format(MENU * menu, int rows, int cols)
60{
61  int total_rows, total_cols;
62
63  T((T_CALLED("set_menu_format(%p,%d,%d)"), menu, rows, cols));
64
65  if (rows < 0 || cols < 0)
66    RETURN(E_BAD_ARGUMENT);
67
68  if (menu)
69    {
70      if (menu->status & _POSTED)
71	RETURN(E_POSTED);
72
73      if (!(menu->items))
74	RETURN(E_NOT_CONNECTED);
75
76      if (rows == 0)
77	rows = menu->frows;
78      if (cols == 0)
79	cols = menu->fcols;
80
81      if (menu->pattern)
82	Reset_Pattern(menu);
83
84      menu->frows = rows;
85      menu->fcols = cols;
86
87      assert(rows > 0 && cols > 0);
88      total_rows = (menu->nitems - 1) / cols + 1;
89      total_cols = (menu->opt & O_ROWMAJOR) ?
90	minimum(menu->nitems, cols) :
91	(menu->nitems - 1) / total_rows + 1;
92
93      menu->rows = total_rows;
94      menu->cols = total_cols;
95      menu->arows = minimum(total_rows, rows);
96      menu->toprow = 0;
97      menu->curitem = *(menu->items);
98      assert(menu->curitem);
99      menu->status |= _LINK_NEEDED;
100      _nc_Calculate_Item_Length_and_Width(menu);
101    }
102  else
103    {
104      if (rows > 0)
105	_nc_Default_Menu.frows = rows;
106      if (cols > 0)
107	_nc_Default_Menu.fcols = cols;
108    }
109
110  RETURN(E_OK);
111}
112
113/*---------------------------------------------------------------------------
114|   Facility      :  libnmenu
115|   Function      :  void menu_format(const MENU *menu, int *rows, int *cols)
116|
117|   Description   :  Returns the maximum number of rows and columns that may
118|                    be displayed at one time on menu.
119|
120|   Return Values :  -
121+--------------------------------------------------------------------------*/
122NCURSES_EXPORT(void)
123menu_format(const MENU * menu, int *rows, int *cols)
124{
125  if (rows)
126    *rows = Normalize_Menu(menu)->frows;
127  if (cols)
128    *cols = Normalize_Menu(menu)->fcols;
129}
130
131/* m_format.c ends here */
132