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/* $Id$
* $URL$
*
* generic widget handling
*
* Copyright (C) 2003, 2004 Michael Reinelt <reinelt@eunet.at>
* Copyright (C) 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.
*
*/
/*
* exported functions:
*
* int widget_junk(void)
* does something
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "debug.h"
#include "cfg.h"
#include "widget.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
/* 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;
}
void widget_unregister(void)
{
int i;
for (i = 0; i < nWidgets; i++) {
Widgets[i].class->quit(&(Widgets[i]));
if (Widgets[i].name)
free(Widgets[i].name);
}
free(Widgets);
free(Classes);
nWidgets = 0;
nClasses = 0;
}
int widget_color(const char *section, const char *name, const char *key, RGBA * C)
{
char *color;
C->R = 0;
C->G = 0;
C->B = 0;
C->A = 0;
color = cfg_get(section, key, NULL);
if (color == NULL)
return 0;
if (*color == '\0') {
free(color);
return 0;
}
if (color2RGBA(color, C) < 0) {
error("widget '%s': ignoring illegal %s color '%s'", name, key, color);
free(color);
return 0;
}
free(color);
return 1;
}
int widget_add(const char *name, const int type, const int layer, const int row, const int col)
{
int i;
char *section;
char *class;
int fg_valid, bg_valid;
RGBA FG, BG;
WIDGET_CLASS *Class;
WIDGET *Widget;
WIDGET *Parent;
/* 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);
free(section);
return -1;
}
/* get widget foreground color */
fg_valid = widget_color(section, name, "foreground", &FG);
bg_valid = widget_color(section, name, "background", &BG);
free(section);
/* lookup widget class */
Class = NULL;
for (i = 0; i < nClasses; i++) {
if (strcasecmp(class, Classes[i].name) == 0) {
Class = &(Classes[i]);
break;
}
}
if (i == nClasses) {
error("widget '%s': class '%s' not supported", name, class);
if (class)
free(class);
return -1;
}
/* check if widget type matches */
if (Class->type != type) {
error("widget '%s': class '%s' not applicable", name, class);
free(class);
return -1;
}
if (class)
free(class);
/* 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;
}
/* look up parent widget (widget with the same name) */
Parent = NULL;
for (i = 0; i < nWidgets; i++) {
if (strcmp(name, Widgets[i].name) == 0) {
Parent = &(Widgets[i]);
break;
}
}
Widget = &(Widgets[nWidgets]);
nWidgets++;
Widget->name = strdup(name);
Widget->class = Class;
Widget->parent = Parent;
Widget->fg_color = FG;
Widget->bg_color = BG;
Widget->fg_valid = fg_valid;
Widget->bg_valid = bg_valid;
Widget->layer = layer;
Widget->row = row;
Widget->col = col;
if (Class->init != NULL) {
Class->init(Widget);
}
return 0;
}
/* return the found widget, or else NULL */
WIDGET *widget_find(int type, void *needle)
{
WIDGET *widget = NULL;
int i;
for (i = 0; i < nWidgets; i++) {
widget = &(Widgets[i]);
if (widget->class->type == type) {
if (widget->class->find != NULL && widget->class->find(widget, needle) == 0)
break;
}
widget = NULL;
}
return widget;
}
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