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m_driver.c

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/****************************************************************************
 *   Author:  Juergen Pfeifer, 1995,1997                                    *
 ****************************************************************************/

/***************************************************************************
* Module m_driver                                                          *
* Central dispatching routine                                              *
***************************************************************************/

#include "menu.priv.h"

MODULE_ID("$Id: m_driver.c,v 1.20 2003/10/25 14:54:48 tom Exp $")

/* Macros */

/* Remove the last character from the match pattern buffer */
#define Remove_Character_From_Pattern(menu) \
  (menu)->pattern[--((menu)->pindex)] = '\0'

/* Add a new character to the match pattern buffer */
#define Add_Character_To_Pattern(menu,ch) \
  { (menu)->pattern[((menu)->pindex)++] = (ch);\
    (menu)->pattern[(menu)->pindex] = '\0'; }

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu
|   Function      :  static bool Is_Sub_String(
|                           bool IgnoreCaseFlag,
|                           const char *part,
|                           const char *string)
|
|   Description   :  Checks whether or not part is a substring of string.
|
|   Return Values :  TRUE   - if it is a substring
|                    FALSE  - if it is not a substring
+--------------------------------------------------------------------------*/
static bool Is_Sub_String(
                    bool  IgnoreCaseFlag,
                    const char *part,
                    const char *string
                   )
{
  assert( part && string );
  if ( IgnoreCaseFlag )
    {
      while(*string && *part)
      {
        if (toupper(*string++)!=toupper(*part)) break;
        part++;
      }
    }
  else
    {
      while( *string && *part )
      if (*part != *string++) break;
      part++;
    }
  return ( (*part) ? FALSE : TRUE );
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu
|   Function      :  int _nc_Match_Next_Character_In_Item_Name(
|                           MENU *menu,
|                           int  ch,
|                           ITEM **item)
|
|   Description   :  This internal routine is called for a menu positioned
|                    at an item with three different classes of characters:
|                       - a printable character; the character is added to
|                         the current pattern and the next item matching
|                         this pattern is searched.
|                       - NUL; the pattern stays as it is and the next item
|                         matching the pattern is searched
|                       - BS; the pattern stays as it is and the previous
|                         item matching the pattern is searched
|
|                       The item parameter contains on call a pointer to
|                       the item where the search starts. On return - if
|                       a match was found - it contains a pointer to the
|                       matching item.
|
|   Return Values :  E_OK        - an item matching the pattern was found
|                    E_NO_MATCH  - nothing found
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
_nc_Match_Next_Character_In_Item_Name
(MENU *menu, int ch, ITEM **item)
{
  bool found = FALSE, passed = FALSE;
  int  idx, last;

  assert( menu && item && *item);
  idx = (*item)->index;

  if (ch && ch!=BS)
    {
      /* if we become to long, we need no further checking : there can't be
       a match ! */
      if ((menu->pindex+1) > menu->namelen)
      RETURN(E_NO_MATCH);

      Add_Character_To_Pattern(menu,ch);
      /* we artificially position one item back, because in the do...while
       loop we start with the next item. This means, that with a new
       pattern search we always start the scan with the actual item. If
       we do a NEXT_PATTERN oder PREV_PATTERN search, we start with the
       one after or before the actual item. */
      if (--idx < 0)
      idx = menu->nitems-1;
    }

  last = idx;                 /* this closes the cycle */

  do{
    if (ch==BS)
      {                 /* we have to go backward */
      if (--idx < 0)
        idx = menu->nitems-1;
      }
    else
      {                 /* otherwise we always go forward */
      if (++idx >= menu->nitems)
        idx = 0;
      }
    if (Is_Sub_String((menu->opt & O_IGNORECASE) != 0,
                  menu->pattern,
                  menu->items[idx]->name.str)
      )
      found = TRUE;
    else
      passed = TRUE;
  } while (!found && (idx != last));

  if (found)
    {
      if (!((idx==(*item)->index) && passed))
      {
        *item = menu->items[idx];
        RETURN(E_OK);
      }
      /* This point is reached, if we fully cycled through the item list
       and the only match we found is the starting item. With a NEXT_PATTERN
       or PREV_PATTERN scan this means, that there was no additional match.
       If we searched with an expanded new pattern, we should never reach
       this point, because if the expanded pattern matches also the actual
       item we will find it in the first attempt (passed==FALSE) and we
       will never cycle through the whole item array.
       */
      assert( ch==0 || ch==BS );
    }
  else
    {
      if (ch && ch!=BS && menu->pindex>0)
      {
        /* if we had no match with a new pattern, we have to restore it */
        Remove_Character_From_Pattern(menu);
      }
    }
  RETURN(E_NO_MATCH);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu
|   Function      :  int menu_driver(MENU *menu, int c)
|
|   Description   :  Central dispatcher for the menu. Translates the logical
|                    request 'c' into a menu action.
|
|   Return Values :  E_OK            - success
|                    E_BAD_ARGUMENT  - invalid menu pointer
|                    E_BAD_STATE     - menu is in user hook routine
|                    E_NOT_POSTED    - menu is not posted
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
menu_driver (MENU * menu, int   c)
{
#define NAVIGATE(dir) \
  if (!item->dir)\
     result = E_REQUEST_DENIED;\
  else\
     item = item->dir

  int result = E_OK;
  ITEM *item;
  int my_top_row, rdiff;

  if (!menu)
    RETURN(E_BAD_ARGUMENT);

  if ( menu->status & _IN_DRIVER )
    RETURN(E_BAD_STATE);
  if ( !( menu->status & _POSTED ) )
    RETURN(E_NOT_POSTED);

  item = menu->curitem;

    my_top_row = menu->toprow;
    assert(item);

    if ((c > KEY_MAX) && (c<=MAX_MENU_COMMAND))
      {
      if (!((c==REQ_BACK_PATTERN)
            || (c==REQ_NEXT_MATCH) || (c==REQ_PREV_MATCH)))
        {
          assert( menu->pattern );
          Reset_Pattern(menu);
        }

      switch(c)
        {
        case REQ_LEFT_ITEM:
          /*=================*/
          NAVIGATE(left);
          break;

        case REQ_RIGHT_ITEM:
          /*==================*/
          NAVIGATE(right);
          break;

        case REQ_UP_ITEM:
          /*===============*/
          NAVIGATE(up);
          break;

        case REQ_DOWN_ITEM:
          /*=================*/
          NAVIGATE(down);
          break;

        case REQ_SCR_ULINE:
          /*=================*/
        if (my_top_row == 0 || !(item->up))
            result = E_REQUEST_DENIED;
          else
            {
            --my_top_row;
            item = item->up;
            }
          break;

        case REQ_SCR_DLINE:
          /*=================*/
        if ((my_top_row + menu->arows >= menu->rows) || !(item->down))
            {
            /* only if the menu has less items than rows, we can deny the
               request. Otherwise the epilogue of this routine adjusts the
               top row if necessary */
            result = E_REQUEST_DENIED;
            }
        else {
          my_top_row++;
            item = item->down;
        }
          break;

        case REQ_SCR_DPAGE:
          /*=================*/
        rdiff = menu->rows - (menu->arows + my_top_row);
          if (rdiff > menu->arows)
            rdiff = menu->arows;
        if (rdiff<=0)
            result = E_REQUEST_DENIED;
          else
            {
            my_top_row += rdiff;
            while(rdiff-- > 0 && item!=(ITEM*)0)
              item = item->down;
            }
          break;

        case REQ_SCR_UPAGE:
          /*=================*/
        rdiff = (menu->arows < my_top_row) ? menu->arows : my_top_row;
        if (rdiff<=0)
            result = E_REQUEST_DENIED;
          else
            {
            my_top_row -= rdiff;
            while(rdiff-- && item!=(ITEM*)0)
              item = item->up;
            }
          break;

        case REQ_FIRST_ITEM:
          /*==================*/
          item = menu->items[0];
          break;

        case REQ_LAST_ITEM:
          /*=================*/
          item = menu->items[menu->nitems-1];
          break;

        case REQ_NEXT_ITEM:
          /*=================*/
          if ((item->index+1)>=menu->nitems)
            {
            if (menu->opt & O_NONCYCLIC)
              result = E_REQUEST_DENIED;
            else
              item = menu->items[0];
            }
          else
            item = menu->items[item->index + 1];
          break;

        case REQ_PREV_ITEM:
          /*=================*/
          if (item->index<=0)
            {
            if (menu->opt & O_NONCYCLIC)
              result = E_REQUEST_DENIED;
            else
              item = menu->items[menu->nitems-1];
            }
          else
            item = menu->items[item->index - 1];
          break;

        case REQ_TOGGLE_ITEM:
          /*===================*/
          if (menu->opt & O_ONEVALUE)
            {
            result = E_REQUEST_DENIED;
            }
          else
            {
            if (menu->curitem->opt & O_SELECTABLE)
              {
                menu->curitem->value = !menu->curitem->value;
                Move_And_Post_Item(menu,menu->curitem);
                _nc_Show_Menu(menu);
              }
            else
              result = E_NOT_SELECTABLE;
            }
          break;

        case REQ_CLEAR_PATTERN:
          /*=====================*/
          /* already cleared in prologue */
          break;

        case REQ_BACK_PATTERN:
          /*====================*/
          if (menu->pindex>0)
            {
            assert(menu->pattern);
            Remove_Character_From_Pattern(menu);
            pos_menu_cursor( menu );
            }
          else
            result = E_REQUEST_DENIED;
          break;

        case REQ_NEXT_MATCH:
          /*==================*/
          assert(menu->pattern);
          if (menu->pattern[0])
            result = _nc_Match_Next_Character_In_Item_Name(menu,0,&item);
          else
            {
            if ((item->index+1)<menu->nitems)
              item=menu->items[item->index+1];
            else
              {
                if (menu->opt & O_NONCYCLIC)
                  result = E_REQUEST_DENIED;
                else
                  item = menu->items[0];
              }
            }
          break;

        case REQ_PREV_MATCH:
          /*==================*/
          assert(menu->pattern);
          if (menu->pattern[0])
            result = _nc_Match_Next_Character_In_Item_Name(menu,BS,&item);
          else
            {
            if (item->index)
              item = menu->items[item->index-1];
            else
              {
                if (menu->opt & O_NONCYCLIC)
                  result = E_REQUEST_DENIED;
                else
                  item = menu->items[menu->nitems-1];
              }
            }
          break;

        default:
          /*======*/
          result = E_UNKNOWN_COMMAND;
          break;
        }
      }
    else
      {                       /* not a command */
      if ( !(c & ~((int)MAX_REGULAR_CHARACTER)) && isprint(c) )
        result = _nc_Match_Next_Character_In_Item_Name( menu, c, &item );
#ifdef NCURSES_MOUSE_VERSION
        else if (KEY_MOUSE == c)
        {
          MEVENT  event;
          WINDOW* uwin = Get_Menu_UserWin(menu);

          getmouse(&event);
          if ((event.bstate & (BUTTON1_CLICKED         |
                         BUTTON1_DOUBLE_CLICKED  |
                         BUTTON1_TRIPLE_CLICKED   ))
           && wenclose(uwin,event.y, event.x))
            { /* we react only if the click was in the userwin, that means
             * inside the menu display area or at the decoration window.
             */
            WINDOW* sub = Get_Menu_Window(menu);
            int ry = event.y, rx = event.x; /* screen coordinates */

            result = E_REQUEST_DENIED;
            if (mouse_trafo(&ry,&rx,FALSE))
              { /* rx, ry are now "curses" coordinates */
                if (ry < sub->_begy)
                  { /* we clicked above the display region; this is
                   * interpreted as "scroll up" request
                   */
                  if (event.bstate & BUTTON1_CLICKED)
                    result = menu_driver(menu,REQ_SCR_ULINE);
                  else if (event.bstate & BUTTON1_DOUBLE_CLICKED)
                    result = menu_driver(menu,REQ_SCR_UPAGE);
                  else if (event.bstate & BUTTON1_TRIPLE_CLICKED)
                    result = menu_driver(menu,REQ_FIRST_ITEM);
                  RETURN(result);
                  }
                else if (ry >= sub->_begy + sub->_maxy)
                  { /* we clicked below the display region; this is
                   * interpreted as "scroll down" request
                   */
                  if (event.bstate & BUTTON1_CLICKED)
                    result = menu_driver(menu,REQ_SCR_DLINE);
                  else if (event.bstate & BUTTON1_DOUBLE_CLICKED)
                    result = menu_driver(menu,REQ_SCR_DPAGE);
                  else if (event.bstate & BUTTON1_TRIPLE_CLICKED)
                    result = menu_driver(menu,REQ_LAST_ITEM);
                  RETURN(result);
                  }
                else if (wenclose(sub,event.y,event.x))
                  { /* Inside the area we try to find the hit item */
                  int i,x,y,err;
                  ry = event.y; rx = event.x;
                  if (wmouse_trafo(sub,&ry,&rx,FALSE))
                    {
                      for(i=0;i<menu->nitems;i++)
                        {
                        err = _nc_menu_cursor_pos(menu,menu->items[i],
                                            &y, &x);
                        if (E_OK==err)
                          {
                            if ((ry==y)       &&
                              (rx>=x)       &&
                              (rx < x + menu->itemlen))
                              {
                              item = menu->items[i];
                              result = E_OK;
                              break;
                              }
                          }
                        }
                      if (E_OK==result)
                        { /* We found an item, now we can handle the click.
                         * A single click just positions the menu cursor
                         * to the clicked item. A double click toggles
                         * the item.
                         */
                        if (event.bstate & BUTTON1_DOUBLE_CLICKED)
                          {
                            _nc_New_TopRow_and_CurrentItem(menu,
                                                   my_top_row,
                                                   item);
                            menu_driver(menu,REQ_TOGGLE_ITEM);
                            result = E_UNKNOWN_COMMAND;
                          }
                        }
                    }
                  }
              }
            }
          else
              result = E_REQUEST_DENIED;
        }
#endif /* NCURSES_MOUSE_VERSION */
      else
        result = E_UNKNOWN_COMMAND;
      }

  if (E_OK==result)
    {
    /* Adjust the top row if it turns out that the current item unfortunately
       doesn't appear in the menu window */
    if ( item->y < my_top_row )
      my_top_row = item->y;
    else if ( item->y >= (my_top_row + menu->arows) )
      my_top_row = item->y - menu->arows + 1;

    _nc_New_TopRow_and_CurrentItem( menu, my_top_row, item );

    }

  RETURN(result);
}

/* m_driver.c ends here */

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