contrib/ncurses-5.4/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 1.19 2003/10/25 14:54:48 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
  60   assert(menu->win);
  61
  62   getyx(menu->win,item_y,item_x);
  63
  64   /* We need a marker iff
  65      - it is a onevalued menu and it is the current item
  66      - or it has a selection value
  67      */
  68   wattron(menu->win,menu->back);
  69   if (item->value || (item==menu->curitem))
  70     {
  71       if (menu->marklen)
  72         {
  73           /* In a multi selection menu we use the fore attribute
  74              for a selected marker that is not the current one.
  75              This improves visualization of the menu, because now
  76              always the 'normal' marker denotes the current
  77              item. */
  78           if (!(menu->opt & O_ONEVALUE) && item->value && item!=menu->curitem)
  79             {
  80               wattron(menu->win,menu->fore);
  81               isfore = TRUE;
  82             }
  83           waddstr(menu->win,menu->mark);
  84           if (isfore)
  85             {
  86               wattron(menu->win,menu->fore);
  87               isfore = FALSE;
  88             }
  89         }
  90     }
  91   else                  /* otherwise we have to wipe out the marker area */
  92     for(ch=' ',i=menu->marklen;i>0;i--)
  93       waddch(menu->win,ch);
  94   wattroff(menu->win,menu->back);
  95   count += menu->marklen;
  96
  97   /* First we have to calculate the attribute depending on selectability
  98      and selection status
  99      */
 100   if (!(item->opt & O_SELECTABLE))
 101     {
 102       wattron(menu->win,menu->grey);
 103       isgrey = TRUE;
 104     }
 105   else
 106     {
 107       if (item->value || item==menu->curitem)
 108         {
 109           wattron(menu->win,menu->fore);
 110           isfore = TRUE;
 111         }
 112       else
 113         {
 114           wattron(menu->win,menu->back);
 115           isback = TRUE;
 116         }
 117     }
 118
 119   waddnstr(menu->win,item->name.str,item->name.length);
 120   for(ch=' ',i=menu->namelen-item->name.length;i>0;i--)
 121     {
 122       waddch(menu->win,ch);
 123     }
 124   count += menu->namelen;
 125
 126   /* Show description if required and available */
 127   if ( (menu->opt & O_SHOWDESC) && menu->desclen>0 )
 128     {
 129       int m = menu->spc_desc/2;
 130       int cy = -1, cx = -1;
 131
 132       for(ch=' ',i=0; i < menu->spc_desc; i++)
 133         {
 134           if (i==m)
 135             {
 136               waddch(menu->win,menu->pad);
 137               getyx(menu->win,cy,cx);
 138             }
 139           else
 140             waddch(menu->win,ch);
 141         }
 142       if (item->description.length)
 143         waddnstr(menu->win,item->description.str,item->description.length);
 144       for(ch=' ',i=menu->desclen-item->description.length; i>0; i--)
 145         {
 146           waddch(menu->win,ch);
 147         }
 148       count += menu->desclen + menu->spc_desc;
 149
 150       if (menu->spc_rows > 1)
 151         {
 152           int j, k, ncy, ncx;
 153
 154           assert(cx>=0 && cy>=0);
 155           getyx(menu->win,ncy,ncx);
 156           if (isgrey) wattroff(menu->win,menu->grey);
 157           else if (isfore) wattroff(menu->win,menu->fore);
 158           wattron(menu->win,menu->back);
 159           for(j=1; j < menu->spc_rows;j++)
 160             {
 161               if ((item_y+j) < getmaxy(menu->win))
 162                 {
 163                   wmove (menu->win,item_y+j,item_x);
 164                   for(k=0;k<count;k++)
 165                     waddch(menu->win,' ');
 166                 }
 167               if ((cy+j) < getmaxy(menu->win))
 168                 mvwaddch(menu->win,cy+j,cx-1,menu->pad);
 169             }
 170           wmove(menu->win,ncy,ncx);
 171           if (!isback)
 172             wattroff(menu->win,menu->back);
 173         }
 174     }
 175
 176   /* Remove attributes */
 177   if (isfore)
 178     wattroff(menu->win,menu->fore);
 179   if (isback)
 180     wattroff(menu->win,menu->back);
 181   if (isgrey)
 182     wattroff(menu->win,menu->grey);
 183 }
 184
 185 /*---------------------------------------------------------------------------
 186 |   Facility      :  libnmenu
 187 |   Function      :  void _nc_Draw_Menu(const MENU *)
 188 |
 189 |   Description   :  Display the menu in its windows
 190 |
 191 |   Return Values :  -
 192 +--------------------------------------------------------------------------*/
 193 NCURSES_EXPORT(void)
 194 _nc_Draw_Menu (const MENU * menu)
 195 {
 196   ITEM *item = menu->items[0];
 197   ITEM *lasthor, *lastvert;
 198   ITEM *hitem;
 199   int y = 0;
 200   chtype s_bkgd;
 201
 202   assert(item && menu->win);
 203
 204   s_bkgd = getbkgd(menu->win);
 205   wbkgdset(menu->win,menu->back);
 206   werase(menu->win);
 207   wbkgdset(menu->win,s_bkgd);
 208
 209   lastvert = (menu->opt & O_NONCYCLIC) ? (ITEM *)0 : item;
 210
 211   do
 212     {
 213       wmove(menu->win,y,0);
 214
 215       hitem   = item;
 216       lasthor = (menu->opt & O_NONCYCLIC) ? (ITEM *)0 : hitem;
 217
 218       do
 219         {
 220           _nc_Post_Item( menu, hitem);
 221
 222           wattron(menu->win,menu->back);
 223           if ( ((hitem = hitem->right) != lasthor) && hitem )
 224             {
 225               int i,j, cy, cx;
 226               chtype ch = ' ';
 227
 228               getyx(menu->win,cy,cx);
 229               for(j=0;j<menu->spc_rows;j++)
 230                 {
 231                   wmove(menu->win,cy+j,cx);
 232                   for(i=0; i < menu->spc_cols; i++)
 233                     {
 234                       waddch( menu->win,ch);
 235                     }
 236                 }
 237               wmove(menu->win,cy,cx+menu->spc_cols);
 238             }
 239         } while (hitem && (hitem != lasthor));
 240       wattroff(menu->win,menu->back);
 241
 242       item = item->down;
 243       y += menu->spc_rows;
 244
 245     } while( item && (item != lastvert) );
 246 }
 247
 248 /*---------------------------------------------------------------------------
 249 |   Facility      :  libnmenu
 250 |   Function      :  int post_menu(MENU *)
 251 |
 252 |   Description   :  Post a menu to the screen. This makes it visible.
 253 |
 254 |   Return Values :  E_OK                - success
 255 |                    E_BAD_ARGUMENT      - not a valid menu pointer
 256 |                    E_SYSTEM_ERROR      - error in lower layers
 257 |                    E_NO_ROOM           - Menu to large for screen
 258 |                    E_NOT_CONNECTED     - No items connected to menu
 259 |                    E_BAD_STATE         - Menu in userexit routine
 260 |                    E_POSTED            - Menu already posted
 261 +--------------------------------------------------------------------------*/
 262 NCURSES_EXPORT(int)
 263 post_menu (MENU * menu)
 264 {
 265   if (!menu)
 266     RETURN(E_BAD_ARGUMENT);
 267
 268   if ( menu->status & _IN_DRIVER )
 269     RETURN(E_BAD_STATE);
 270
 271   if ( menu->status & _POSTED )
 272     RETURN(E_POSTED);
 273
 274   if (menu->items && *(menu->items))
 275     {
 276       int y;
 277       int h = 1 + menu->spc_rows * (menu->rows - 1);
 278
 279       WINDOW *win = Get_Menu_Window(menu);
 280       int maxy = getmaxy(win);
 281       int maxx = getmaxx(win);
 282
 283       if (maxx < menu->width || maxy < menu->height)
 284         RETURN(E_NO_ROOM);
 285
 286       if ( (menu->win = newpad(h,menu->width)) )
 287         {
 288           y = (maxy >= h) ? h : maxy;
 289           if (y>=menu->height)
 290             y = menu->height;
 291           if(!(menu->sub = subpad(menu->win,y,menu->width,0,0)))
 292             RETURN(E_SYSTEM_ERROR);
 293         }
 294       else
 295         RETURN(E_SYSTEM_ERROR);
 296
 297       if (menu->status & _LINK_NEEDED)
 298         _nc_Link_Items(menu);
 299     }
 300   else
 301     RETURN(E_NOT_CONNECTED);
 302
 303   menu->status |= _POSTED;
 304
 305   if (!(menu->opt&O_ONEVALUE))
 306     {
 307       ITEM **items;
 308
 309       for(items=menu->items;*items;items++)
 310         {
 311           (*items)->value = FALSE;
 312         }
 313     }
 314
 315   _nc_Draw_Menu(menu);
 316
 317   Call_Hook(menu,menuinit);
 318   Call_Hook(menu,iteminit);
 319
 320   _nc_Show_Menu(menu);
 321
 322   RETURN(E_OK);
 323 }
 324
 325 /*---------------------------------------------------------------------------
 326 |   Facility      :  libnmenu
 327 |   Function      :  int unpost_menu(MENU *)
 328 |
 329 |   Description   :  Detach menu from screen
 330 |
 331 |   Return Values :  E_OK              - success
 332 |                    E_BAD_ARGUMENT    - not a valid menu pointer
 333 |                    E_BAD_STATE       - menu in userexit routine
 334 |                    E_NOT_POSTED      - menu is not posted
 335 +--------------------------------------------------------------------------*/
 336 NCURSES_EXPORT(int)
 337 unpost_menu (MENU * menu)
 338 {
 339   WINDOW *win;
 340
 341   if (!menu)
 342     RETURN(E_BAD_ARGUMENT);
 343
 344   if ( menu->status & _IN_DRIVER )
 345     RETURN(E_BAD_STATE);
 346
 347   if ( !( menu->status & _POSTED ) )
 348     RETURN(E_NOT_POSTED);
 349
 350   Call_Hook(menu,itemterm);
 351   Call_Hook(menu,menuterm);
 352
 353   win = Get_Menu_Window(menu);
 354   werase(win);
 355   wsyncup(win);
 356
 357   assert(menu->sub);
 358   delwin(menu->sub);
 359   menu->sub = (WINDOW *)0;
 360
 361   assert(menu->win);
 362   delwin(menu->win);
 363   menu->win = (WINDOW *)0;
 364
 365   menu->status &= ~_POSTED;
 366
 367   RETURN(E_OK);
 368 }
 369
 370 /* m_post.c ends here */