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/****************************************************************************
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* Copyright (c) 1998 Free Software Foundation, Inc. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the *
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* "Software"), to deal in the Software without restriction, including *
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* without limitation the rights to use, copy, modify, merge, publish, *
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* distribute, distribute with modifications, sublicense, and/or sell *
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* copies of the Software, and to permit persons to whom the Software is *
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* furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included *
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* in all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Except as contained in this notice, the name(s) of the above copyright *
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* holders shall not be used in advertising or otherwise to promote the *
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* sale, use or other dealings in this Software without prior written *
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* authorization. *
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****************************************************************************/
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/****************************************************************************
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* Author: Juergen Pfeifer <juergen.pfeifer@gmx.net> 1995,1997 *
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****************************************************************************/
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#include "form.priv.h"
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MODULE_ID("$Id$")
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/* this can't be readonly */
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static FORM default_form = {
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0, /* status */
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0, /* rows */
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0, /* cols */
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0, /* currow */
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0, /* curcol */
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0, /* toprow */
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0, /* begincol */
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-1, /* maxfield */
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-1, /* maxpage */
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-1, /* curpage */
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ALL_FORM_OPTS, /* opts */
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(WINDOW *)0, /* win */
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(WINDOW *)0, /* sub */
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(WINDOW *)0, /* w */
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(FIELD **)0, /* field */
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(FIELD *)0, /* current */
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(_PAGE *)0, /* page */
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(char *)0, /* usrptr */
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NULL, /* forminit */
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NULL, /* formterm */
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NULL, /* fieldinit */
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NULL /* fieldterm */
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};
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FORM *_nc_Default_Form = &default_form;
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static FIELD *Insert_Field_By_Position(
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| FIELD *new_field,
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| FIELD *head )
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| Description : Insert new_field into sorted fieldlist with head "head"
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| and return new head of sorted fieldlist. Sorting
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| criteria is (row,column). This is a circular list.
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| Return Values : New head of sorted fieldlist
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+--------------------------------------------------------------------------*/
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static FIELD *Insert_Field_By_Position(FIELD *newfield, FIELD *head)
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{
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FIELD *current, *newhead;
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assert(newfield != 0);
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if (!head)
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{ /* empty list is trivial */
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newhead = newfield->snext = newfield->sprev = newfield;
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}
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else
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{
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newhead = current = head;
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while((current->frow < newfield->frow) ||
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((current->frow==newfield->frow) &&
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(current->fcol < newfield->fcol)) )
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{
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current = current->snext;
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if (current==head)
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{ /* We cycled through. Reset head to indicate that */
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head = (FIELD *)0;
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break;
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}
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}
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/* we leave the loop with current pointing to the field after newfield*/
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newfield->snext = current;
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newfield->sprev = current->sprev;
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newfield->snext->sprev = newfield;
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newfield->sprev->snext = newfield;
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if (current==head)
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newhead = newfield;
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}
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return(newhead);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static void Disconnect_Fields(FORM *form)
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| Description : Break association between form and array of fields.
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| Return Values : -
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+--------------------------------------------------------------------------*/
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static void Disconnect_Fields( FORM * form )
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{
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if (form->field)
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{
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FIELD **fields;
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for(fields=form->field;*fields;fields++)
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{
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if (form == (*fields)->form)
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(*fields)->form = (FORM *)0;
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}
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form->rows = form->cols = 0;
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form->maxfield = form->maxpage = -1;
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form->field = (FIELD **)0;
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if (form->page)
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free(form->page);
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form->page = (_PAGE *)0;
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}
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static int Connect_Fields(FORM *form, FIELD **fields)
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| Description : Set association between form and array of fields.
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| Return Values : E_OK - no error
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| E_CONNECTED - a field is already connected
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| E_BAD_ARGUMENT - Invalid form pointer or field array
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| E_SYSTEM_ERROR - not enough memory
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+--------------------------------------------------------------------------*/
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static int Connect_Fields(FORM * form, FIELD ** fields)
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{
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int field_cnt, j;
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int page_nr;
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int maximum_row_in_field, maximum_col_in_field;
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_PAGE *pg;
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assert(form != 0);
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form->field = fields;
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form->maxfield = 0;
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form->maxpage = 0;
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if (!fields)
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RETURN(E_OK);
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page_nr = 0;
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/* store formpointer in fields and count pages */
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for(field_cnt=0;fields[field_cnt];field_cnt++)
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{
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if (fields[field_cnt]->form)
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RETURN(E_CONNECTED);
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if ( field_cnt==0 ||
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(fields[field_cnt]->status & _NEWPAGE))
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page_nr++;
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fields[field_cnt]->form = form;
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}
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if (field_cnt==0)
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RETURN(E_BAD_ARGUMENT);
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/* allocate page structures */
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if ( (pg = (_PAGE *)malloc(page_nr * sizeof(_PAGE))) != (_PAGE *)0 )
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{
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form->page = pg;
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}
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else
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RETURN(E_SYSTEM_ERROR);
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/* Cycle through fields and calculate page boundaries as well as
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size of the form */
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for(j=0;j<field_cnt;j++)
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{
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if (j==0)
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pg->pmin = j;
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else
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{
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if (fields[j]->status & _NEWPAGE)
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{
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pg->pmax = j-1;
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pg++;
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pg->pmin = j;
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}
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}
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maximum_row_in_field = fields[j]->frow + fields[j]->rows;
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maximum_col_in_field = fields[j]->fcol + fields[j]->cols;
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if (form->rows < maximum_row_in_field)
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form->rows = maximum_row_in_field;
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if (form->cols < maximum_col_in_field)
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form->cols = maximum_col_in_field;
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}
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pg->pmax = field_cnt-1;
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form->maxfield = field_cnt;
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form->maxpage = page_nr;
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/* Sort fields on form pages */
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for(page_nr = 0;page_nr < form->maxpage; page_nr++)
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{
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FIELD *fld = (FIELD *)0;
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for(j = form->page[page_nr].pmin;j <= form->page[page_nr].pmax;j++)
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{
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fields[j]->index = j;
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fields[j]->page = page_nr;
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fld = Insert_Field_By_Position(fields[j],fld);
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}
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form->page[page_nr].smin = fld->index;
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form->page[page_nr].smax = fld->sprev->index;
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}
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RETURN(E_OK);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static int Associate_Fields(FORM *form, FIELD **fields)
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| Description : Set association between form and array of fields.
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| If there are fields, position to first active field.
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| Return Values : E_OK - success
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| any other - error occured
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+--------------------------------------------------------------------------*/
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INLINE static int Associate_Fields(FORM *form, FIELD **fields)
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{
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int res = Connect_Fields(form,fields);
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if (res == E_OK)
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{
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if (form->maxpage>0)
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{
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form->curpage = 0;
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form_driver(form,FIRST_ACTIVE_MAGIC);
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}
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else
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{
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form->curpage = -1;
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form->current = (FIELD *)0;
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}
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}
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return(res);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : FORM *new_form( FIELD **fields )
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| Description : Create new form with given array of fields.
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| Return Values : Pointer to form. NULL if error occured.
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+--------------------------------------------------------------------------*/
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FORM *new_form(FIELD ** fields)
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{
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int err = E_SYSTEM_ERROR;
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FORM *form = (FORM *)malloc(sizeof(FORM));
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if (form)
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{
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*form = *_nc_Default_Form;
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if ((err=Associate_Fields(form,fields))!=E_OK)
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{
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free_form(form);
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form = (FORM *)0;
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}
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}
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if (!form)
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SET_ERROR(err);
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return(form);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : int free_form( FORM *form )
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| Description : Release internal memory associated with form.
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| Return Values : E_OK - no error
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| E_BAD_ARGUMENT - invalid form pointer
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| E_POSTED - form is posted
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+--------------------------------------------------------------------------*/
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int free_form(FORM * form)
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{
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if ( !form )
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RETURN(E_BAD_ARGUMENT);
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if ( form->status & _POSTED)
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RETURN(E_POSTED);
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Disconnect_Fields( form );
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if (form->page)
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free(form->page);
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free(form);
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RETURN(E_OK);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : int set_form_fields( FORM *form, FIELD **fields )
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| Description : Set a new association of an array of fields to a form
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| Return Values : E_OK - no error
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| E_BAD_ARGUMENT - invalid form pointer
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| E_POSTED - form is posted
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+--------------------------------------------------------------------------*/
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int set_form_fields(FORM * form, FIELD ** fields)
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{
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FIELD **old;
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int res;
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if ( !form )
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RETURN(E_BAD_ARGUMENT);
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if ( form->status & _POSTED )
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RETURN(E_POSTED);
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old = form->field;
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Disconnect_Fields( form );
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if( (res = Associate_Fields( form, fields )) != E_OK )
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Connect_Fields( form, old );
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RETURN(res);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : FIELD **form_fields( const FORM *form )
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| Description : Retrieve array of fields
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| Return Values : Pointer to field array
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+--------------------------------------------------------------------------*/
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FIELD **form_fields(const FORM * form)
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{
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return (Normalize_Form( form )->field);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : int field_count( const FORM *form )
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| Description : Retrieve number of fields
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| Return Values : Number of fields, -1 if none are defined
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+--------------------------------------------------------------------------*/
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int field_count(const FORM * form)
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{
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return (Normalize_Form( form )->maxfield);
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}
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/* frm_def.c ends here */
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