m_driver.c

ncurses-5.4

	  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 */