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/* $Id: widget.c,v 1.9 2004/01/23 04:53:57 reinelt Exp $
*
* generic widget handling
*
* Copyright 2003,2004 Michael Reinelt <reinelt@eunet.at>
* Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* $Log: widget.c,v $
* Revision 1.9 2004/01/23 04:53:57 reinelt
* icon widget added (not finished yet!)
*
* Revision 1.8 2004/01/14 11:33:00 reinelt
* new plugin 'uname' which does what it's called
* text widget nearly finished
* first results displayed on MatrixOrbital
*
* Revision 1.7 2004/01/13 08:18:20 reinelt
* timer queues added
* liblcd4linux deactivated turing transformation to new layout
*
* Revision 1.6 2004/01/11 18:26:02 reinelt
* further widget and layout processing
*
* Revision 1.5 2004/01/11 09:26:15 reinelt
* layout starts to exist...
*
* Revision 1.4 2004/01/10 20:22:33 reinelt
* added new function 'cfg_list()' (not finished yet)
* added layout.c (will replace processor.c someday)
* added widget_text.c (will be the first and most important widget)
* modified lcd4linux.c so that old-style configs should work, too
*
* Revision 1.3 2004/01/10 17:34:40 reinelt
* further matrixOrbital changes
* widgets initialized
*
* Revision 1.2 2003/10/05 17:58:50 reinelt
* libtool junk; copyright messages cleaned up
*
* Revision 1.1 2003/09/19 03:51:29 reinelt
* minor fixes, widget.c added
*
*/
/*
* exported functions:
*
* int widget_junk(void)
* does something
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "debug.h"
#include "cfg.h"
#include "widget.h"
// we use a static array of widgets and not realloc()
#define MAX_WIDGETS 256
static WIDGET_CLASS *Classes=NULL;
static int nClasses=0;
static WIDGET *Widgets=NULL;
static int nWidgets=0;
static int widget_added=0;
int widget_register (WIDGET_CLASS *widget)
{
int i;
// sanity check: disallow widget registering after at least one
// widget has been added, because we use realloc here, and there may
// be pointers to the old memory area
if (widget_added) {
error ("internal error: register_widget(%s) after add_widget()", widget->name);
return -1;
}
for (i=0; i<nClasses; i++) {
if (strcasecmp(widget->name, Classes[i].name)==0) {
error ("internal error: widget '%s' already exists!", widget->name);
return -1;
}
}
nClasses++;
Classes=realloc(Classes, nClasses*sizeof(WIDGET_CLASS));
Classes[nClasses-1] = *widget;
return 0;
}
int widget_add (char *name, int row, int col)
{
int i;
char *section;
char *class;
WIDGET_CLASS *Class;
WIDGET *Widget;
// prepare config section
// strlen("Widget:")=7
section=malloc(strlen(name)+8);
strcpy(section, "Widget:");
strcat(section, name);
// get widget class
class=cfg_get(section, "class", NULL);
if (class==NULL || *class=='\0') {
error ("error: widget '%s' has no class!", name);
if (class) free (class);
return -1;
}
// lookup widget class
Class=NULL;
for (i=0; i<nClasses; i++) {
if (strcasecmp(class, Classes[i].name)==0) {
Class=&(Classes[i]);
break;
}
}
if (class) free (class);
if (i==nClasses) {
error ("widget '%s': class '%s' not supported");
return -1;
}
// do NOT use realloc here because there may be pointers to the old
// memory area, which would point to nowhere if realloc moves the area
if (Widgets==NULL) {
Widgets=malloc(MAX_WIDGETS*sizeof(WIDGET));
if (Widgets==NULL) {
error ("internal error: allocation of widget buffer failed: %s", strerror(errno));
return -1;
}
}
// another sanity check
if (nWidgets>=MAX_WIDGETS) {
error ("internal error: widget buffer full!");
return -1;
}
Widget=&(Widgets[nWidgets]);
nWidgets++;
Widget->name = name;
Widget->class = Class;
Widget->row = row;
Widget->col = col;
if (Class->init!=0) {
Class->init(Widget);
}
return 0;
}
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