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/*
* $Id: gwymodule-layer.c 20678 2017-12-18 18:26:55Z yeti-dn $
* Copyright (C) 2003,2004 David Necas (Yeti), Petr Klapetek.
* E-mail: yeti@gwyddion.net, klapetek@gwyddion.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 of the License, 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include <string.h>
#include <libgwyddion/gwymacros.h>
#include <libgwyddion/gwyutils.h>
#include <libgwymodule/gwymodule-layer.h>
#include "gwymoduleinternal.h"
/* Auxiliary structure to pass both user callback function and data to
* g_hash_table_foreach() lambda argument in gwy_layer_func_foreach() */
typedef struct {
GFunc function;
gpointer user_data;
} LayerFuncForeachData;
static GHashTable *layer_funcs = NULL;
/**
* gwy_layer_func_register:
* @type: Layer type in GObject type system. That is the return value of
* gwy_layer_foo_get_type().
*
* Registeres a layer function (layer type).
*
* Returns: Normally %TRUE; %FALSE on failure.
**/
gboolean
gwy_layer_func_register(GType type)
{
const gchar *name;
gpointer klass;
g_return_val_if_fail(type, FALSE);
klass = g_type_class_ref(type);
name = g_type_name(type);
gwy_debug("layer type = %s", name);
if (!layer_funcs) {
gwy_debug("Initializing...");
layer_funcs = g_hash_table_new_full(g_str_hash, g_str_equal,
NULL, NULL);
}
if (g_hash_table_lookup(layer_funcs, name)) {
g_warning("Duplicate type %s, keeping only first", name);
g_type_class_unref(klass);
return FALSE;
}
g_hash_table_insert(layer_funcs, (gpointer)name, GUINT_TO_POINTER(type));
if (!_gwy_module_add_registered_function(GWY_MODULE_PREFIX_LAYER, name)) {
g_hash_table_remove(layer_funcs, name);
g_type_class_unref(klass);
return FALSE;
}
return TRUE;
}
static void
gwy_layer_func_user_cb(gpointer key,
G_GNUC_UNUSED gpointer value,
gpointer user_data)
{
LayerFuncForeachData *lffd = (LayerFuncForeachData*)user_data;
lffd->function(key, lffd->user_data);
}
/**
* gwy_layer_func_foreach:
* @function: Function to run for each layer function. It will get function
* name (constant string owned by module system) as its first
* argument, @user_data as the second argument.
* @user_data: Data to pass to @function.
*
* Calls a function for each layer function.
**/
void
gwy_layer_func_foreach(GFunc function,
gpointer user_data)
{
LayerFuncForeachData lffd;
if (!layer_funcs)
return;
lffd.user_data = user_data;
lffd.function = function;
g_hash_table_foreach(layer_funcs, gwy_layer_func_user_cb, &lffd);
}
gboolean
_gwy_layer_func_remove(const gchar *name)
{
GType type;
gwy_debug("%s", name);
type = GPOINTER_TO_UINT(g_hash_table_lookup(layer_funcs, name));
if (!type) {
g_warning("Cannot remove function %s", name);
return FALSE;
}
g_type_class_unref(g_type_class_peek(type));
g_hash_table_remove(layer_funcs, name);
return TRUE;
}
/************************** Documentation ****************************/
/**
* SECTION:gwymodule-layer
* @title: gwymodule-layer
* @short_description: GwyDataView layer modules
*
* Layer modules implement #GwyDataView layers, corresponding to different
* kinds of selections.
**/
/* vim: set cin et ts=4 sw=4 cino=>1s,e0,n0,f0,{0,}0,^0,\:1s,=0,g1s,h0,t0,+1s,c3,(0,u0 : */
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