contrib/ncurses/menu/m_post.c

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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 /***************************************************************************
  34 * Module m_post                                                            *
  35 * Write or erase menus from associated subwindows                          *
  36 ***************************************************************************/
  37
  38 #include "menu.priv.h"
  39
  40 MODULE_ID("$Id: m_post.c,v 1.26 2004/12/25 23:57:04 tom Exp $")
  41
  42 /*---------------------------------------------------------------------------
  43 |   Facility      :  libnmenu
  44 |   Function      :  void _nc_Post_Item(MENU *menu, ITEM *item)
  45 |
  46 |   Description   :  Draw the item in the menus window at the current
  47 |                    window position
  48 |
  49 |   Return Values :  -
  50 +--------------------------------------------------------------------------*/
  51 NCURSES_EXPORT(void)
  52 _nc_Post_Item(const MENU * menu, const ITEM * item)
  53 {
  54   int i;
  55   chtype ch;
  56   int item_x, item_y;
  57   int count = 0;
  58   bool isfore = FALSE, isback = FALSE, isgrey = FALSE;
  59   int name_len;
  60   int desc_len;
  61
  62   assert(menu->win);
  63
  64   getyx(menu->win, item_y, item_x);
  65
  66   /* We need a marker iff
  67      - it is a onevalued menu and it is the current item
  68      - or it has a selection value
  69    */
  70   wattron(menu->win, menu->back);
  71   if (item->value || (item == menu->curitem))
  72     {
  73       if (menu->marklen)
  74         {
  75           /* In a multi selection menu we use the fore attribute
  76              for a selected marker that is not the current one.
  77              This improves visualization of the menu, because now
  78              always the 'normal' marker denotes the current
  79              item. */
  80           if (!(menu->opt & O_ONEVALUE) && item->value && item != menu->curitem)
  81             {
  82               wattron(menu->win, menu->fore);
  83               isfore = TRUE;
  84             }
  85           waddstr(menu->win, menu->mark);
  86           if (isfore)
  87             {
  88               wattron(menu->win, menu->fore);
  89               isfore = FALSE;
  90             }
  91         }
  92     }
  93   else                          /* otherwise we have to wipe out the marker area */
  94     for (ch = ' ', i = menu->marklen; i > 0; i--)
  95       waddch(menu->win, ch);
  96   wattroff(menu->win, menu->back);
  97   count += menu->marklen;
  98
  99   /* First we have to calculate the attribute depending on selectability
 100      and selection status
 101    */
 102   if (!(item->opt & O_SELECTABLE))
 103     {
 104       wattron(menu->win, menu->grey);
 105       isgrey = TRUE;
 106     }
 107   else
 108     {
 109       if (item->value || item == menu->curitem)
 110         {
 111           wattron(menu->win, menu->fore);
 112           isfore = TRUE;
 113         }
 114       else
 115         {
 116           wattron(menu->win, menu->back);
 117           isback = TRUE;
 118         }
 119     }
 120
 121   waddnstr(menu->win, item->name.str, item->name.length);
 122   name_len = _nc_Calculate_Text_Width(&(item->name));
 123   for (ch = ' ', i = menu->namelen - name_len; i > 0; i--)
 124     {
 125       waddch(menu->win, ch);
 126     }
 127   count += menu->namelen;
 128
 129   /* Show description if required and available */
 130   if ((menu->opt & O_SHOWDESC) && menu->desclen > 0)
 131     {
 132       int m = menu->spc_desc / 2;
 133       int cy = -1, cx = -1;
 134
 135       for (ch = ' ', i = 0; i < menu->spc_desc; i++)
 136         {
 137           if (i == m)
 138             {
 139               waddch(menu->win, menu->pad);
 140               getyx(menu->win, cy, cx);
 141             }
 142           else
 143             waddch(menu->win, ch);
 144         }
 145       if (item->description.length)
 146         waddnstr(menu->win, item->description.str, item->description.length);
 147       desc_len = _nc_Calculate_Text_Width(&(item->description));
 148       for (ch = ' ', i = menu->desclen - desc_len; i > 0; i--)
 149         {
 150           waddch(menu->win, ch);
 151         }
 152       count += menu->desclen + menu->spc_desc;
 153
 154       if (menu->spc_rows > 1)
 155         {
 156           int j, k, ncy, ncx;
 157
 158           assert(cx >= 0 && cy >= 0);
 159           getyx(menu->win, ncy, ncx);
 160           if (isgrey)
 161             wattroff(menu->win, menu->grey);
 162           else if (isfore)
 163             wattroff(menu->win, menu->fore);
 164           wattron(menu->win, menu->back);
 165           for (j = 1; j < menu->spc_rows; j++)
 166             {
 167               if ((item_y + j) < getmaxy(menu->win))
 168                 {
 169                   wmove(menu->win, item_y + j, item_x);
 170                   for (k = 0; k < count; k++)
 171                     waddch(menu->win, ' ');
 172                 }
 173               if ((cy + j) < getmaxy(menu->win))
 174                 mvwaddch(menu->win, cy + j, cx - 1, menu->pad);
 175             }
 176           wmove(menu->win, ncy, ncx);
 177           if (!isback)
 178             wattroff(menu->win, menu->back);
 179         }
 180     }
 181
 182   /* Remove attributes */
 183   if (isfore)
 184     wattroff(menu->win, menu->fore);
 185   if (isback)
 186     wattroff(menu->win, menu->back);
 187   if (isgrey)
 188     wattroff(menu->win, menu->grey);
 189 }
 190
 191 /*---------------------------------------------------------------------------
 192 |   Facility      :  libnmenu
 193 |   Function      :  void _nc_Draw_Menu(const MENU *)
 194 |
 195 |   Description   :  Display the menu in its windows
 196 |
 197 |   Return Values :  -
 198 +--------------------------------------------------------------------------*/
 199 NCURSES_EXPORT(void)
 200 _nc_Draw_Menu(const MENU * menu)
 201 {
 202   ITEM *item = menu->items[0];
 203   ITEM *lasthor, *lastvert;
 204   ITEM *hitem;
 205   int y = 0;
 206   chtype s_bkgd;
 207
 208   assert(item && menu->win);
 209
 210   s_bkgd = getbkgd(menu->win);
 211   wbkgdset(menu->win, menu->back);
 212   werase(menu->win);
 213   wbkgdset(menu->win, s_bkgd);
 214
 215   lastvert = (menu->opt & O_NONCYCLIC) ? (ITEM *) 0 : item;
 216
 217   do
 218     {
 219       wmove(menu->win, y, 0);
 220
 221       hitem = item;
 222       lasthor = (menu->opt & O_NONCYCLIC) ? (ITEM *) 0 : hitem;
 223
 224       do
 225         {
 226           _nc_Post_Item(menu, hitem);
 227
 228           wattron(menu->win, menu->back);
 229           if (((hitem = hitem->right) != lasthor) && hitem)
 230             {
 231               int i, j, cy, cx;
 232               chtype ch = ' ';
 233
 234               getyx(menu->win, cy, cx);
 235               for (j = 0; j < menu->spc_rows; j++)
 236                 {
 237                   wmove(menu->win, cy + j, cx);
 238                   for (i = 0; i < menu->spc_cols; i++)
 239                     {
 240                       waddch(menu->win, ch);
 241                     }
 242                 }
 243               wmove(menu->win, cy, cx + menu->spc_cols);
 244             }
 245         }
 246       while (hitem && (hitem != lasthor));
 247       wattroff(menu->win, menu->back);
 248
 249       item = item->down;
 250       y += menu->spc_rows;
 251
 252     }
 253   while (item && (item != lastvert));
 254 }
 255
 256 /*---------------------------------------------------------------------------
 257 |   Facility      :  libnmenu
 258 |   Function      :  int post_menu(MENU *)
 259 |
 260 |   Description   :  Post a menu to the screen. This makes it visible.
 261 |
 262 |   Return Values :  E_OK                - success
 263 |                    E_BAD_ARGUMENT      - not a valid menu pointer
 264 |                    E_SYSTEM_ERROR      - error in lower layers
 265 |                    E_NOT_CONNECTED     - No items connected to menu
 266 |                    E_BAD_STATE         - Menu in userexit routine
 267 |                    E_POSTED            - Menu already posted
 268 +--------------------------------------------------------------------------*/
 269 NCURSES_EXPORT(int)
 270 post_menu(MENU * menu)
 271 {
 272   T((T_CALLED("post_menu(%p)"), menu));
 273
 274   if (!menu)
 275     RETURN(E_BAD_ARGUMENT);
 276
 277   if (menu->status & _IN_DRIVER)
 278     RETURN(E_BAD_STATE);
 279
 280   if (menu->status & _POSTED)
 281     RETURN(E_POSTED);
 282
 283   if (menu->items && *(menu->items))
 284     {
 285       int y;
 286       int h = 1 + menu->spc_rows * (menu->rows - 1);
 287
 288       WINDOW *win = Get_Menu_Window(menu);
 289       int maxy = getmaxy(win);
 290
 291       if ((menu->win = newpad(h, menu->width)))
 292         {
 293           y = (maxy >= h) ? h : maxy;
 294           if (y >= menu->height)
 295             y = menu->height;
 296           if (!(menu->sub = subpad(menu->win, y, menu->width, 0, 0)))
 297             RETURN(E_SYSTEM_ERROR);
 298         }
 299       else
 300         RETURN(E_SYSTEM_ERROR);
 301
 302       if (menu->status & _LINK_NEEDED)
 303         _nc_Link_Items(menu);
 304     }
 305   else
 306     RETURN(E_NOT_CONNECTED);
 307
 308   menu->status |= _POSTED;
 309
 310   if (!(menu->opt & O_ONEVALUE))
 311     {
 312       ITEM **items;
 313
 314       for (items = menu->items; *items; items++)
 315         {
 316           (*items)->value = FALSE;
 317         }
 318     }
 319
 320   _nc_Draw_Menu(menu);
 321
 322   Call_Hook(menu, menuinit);
 323   Call_Hook(menu, iteminit);
 324
 325   _nc_Show_Menu(menu);
 326
 327   RETURN(E_OK);
 328 }
 329
 330 /*---------------------------------------------------------------------------
 331 |   Facility      :  libnmenu
 332 |   Function      :  int unpost_menu(MENU *)
 333 |
 334 |   Description   :  Detach menu from screen
 335 |
 336 |   Return Values :  E_OK              - success
 337 |                    E_BAD_ARGUMENT    - not a valid menu pointer
 338 |                    E_BAD_STATE       - menu in userexit routine
 339 |                    E_NOT_POSTED      - menu is not posted
 340 +--------------------------------------------------------------------------*/
 341 NCURSES_EXPORT(int)
 342 unpost_menu(MENU * menu)
 343 {
 344   WINDOW *win;
 345
 346   T((T_CALLED("unpost_menu(%p)"), menu));
 347
 348   if (!menu)
 349     RETURN(E_BAD_ARGUMENT);
 350
 351   if (menu->status & _IN_DRIVER)
 352     RETURN(E_BAD_STATE);
 353
 354   if (!(menu->status & _POSTED))
 355     RETURN(E_NOT_POSTED);
 356
 357   Call_Hook(menu, itemterm);
 358   Call_Hook(menu, menuterm);
 359
 360   win = Get_Menu_Window(menu);
 361   werase(win);
 362   wsyncup(win);
 363
 364   assert(menu->sub);
 365   delwin(menu->sub);
 366   menu->sub = (WINDOW *)0;
 367
 368   assert(menu->win);
 369   delwin(menu->win);
 370   menu->win = (WINDOW *)0;
 371
 372   menu->status &= ~_POSTED;
 373
 374   RETURN(E_OK);
 375 }
 376
 377 /* m_post.c ends here */