/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* e-tree-memory-callbacks.c: a Tree Model that offers a function pointer
* interface to using ETreeModel, similar to ETableSimple.
*
* Author:
* Chris Toshok (toshok@ximian.com)
*
* (C) 2000 Ximian, Inc. */
#include <config.h>
#include <gtk/gtksignal.h>
#include "gal/util/e-util.h"
#include "e-tree-memory-callbacks.h"
#define PARENT_TYPE E_TREE_MEMORY_TYPE
static GdkPixbuf *
etmc_icon_at (ETreeModel *etm, ETreePath node)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
return etmc->icon_at (etm, node, etmc->model_data);
}
static int
etmc_column_count (ETreeModel *etm)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
if (etmc->column_count)
return etmc->column_count (etm, etmc->model_data);
else
return 0;
}
static gboolean
etmc_has_save_id (ETreeModel *etm)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
if (etmc->has_save_id)
return etmc->has_save_id (etm, etmc->model_data);
else
return FALSE;
}
static char *
etmc_get_save_id (ETreeModel *etm, ETreePath node)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
if (etmc->get_save_id)
return etmc->get_save_id (etm, node, etmc->model_data);
else
return NULL;
}
static void *
etmc_value_at (ETreeModel *etm, ETreePath node, int col)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
return etmc->value_at (etm, node, col, etmc->model_data);
}
static void
etmc_set_value_at (ETreeModel *etm, ETreePath node, int col, const void *val)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
etmc->set_value_at (etm, node, col, val, etmc->model_data);
}
static gboolean
etmc_is_editable (ETreeModel *etm, ETreePath node, int col)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
return etmc->is_editable (etm, node, col, etmc->model_data);
}
/* The default for etmc_duplicate_value is to return the raw value. */
static void *
etmc_duplicate_value (ETreeModel *etm, int col, const void *value)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
if (etmc->duplicate_value)
return etmc->duplicate_value (etm, col, value, etmc->model_data);
else
return (void *)value;
}
static void
etmc_free_value (ETreeModel *etm, int col, void *value)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
if (etmc->free_value)
etmc->free_value (etm, col, value, etmc->model_data);
}
static void *
etmc_initialize_value (ETreeModel *etm, int col)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
if (etmc->initialize_value)
return etmc->initialize_value (etm, col, etmc->model_data);
else
return NULL;
}
static gboolean
etmc_value_is_empty (ETreeModel *etm, int col, const void *value)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
if (etmc->value_is_empty)
return etmc->value_is_empty (etm, col, value, etmc->model_data);
else
return FALSE;
}
static char *
etmc_value_to_string (ETreeModel *etm, int col, const void *value)
{
ETreeMemoryCallbacks *etmc = E_TREE_MEMORY_CALLBACKS(etm);
if (etmc->value_to_string)
return etmc->value_to_string (etm, col, value, etmc->model_data);
else
return g_strdup ("");
}
static void
e_tree_memory_callbacks_class_init (GtkObjectClass *object_class)
{
ETreeModelClass *model_class = (ETreeModelClass *) object_class;
model_class->icon_at = etmc_icon_at;
model_class->column_count = etmc_column_count;
model_class->has_save_id = etmc_has_save_id;
model_class->get_save_id = etmc_get_save_id;
model_class->value_at = etmc_value_at;
model_class->set_value_at = etmc_set_value_at;
model_class->is_editable = etmc_is_editable;
model_class->duplicate_value = etmc_duplicate_value;
model_class->free_value = etmc_free_value;
model_class->initialize_value = etmc_initialize_value;
model_class->value_is_empty = etmc_value_is_empty;
model_class->value_to_string = etmc_value_to_string;
}
E_MAKE_TYPE(e_tree_memory_callbacks, "ETreeMemoryCallbacks", ETreeMemoryCallbacks, e_tree_memory_callbacks_class_init, NULL, PARENT_TYPE)
/**
* e_tree_memory_callbacks_new:
*
* This initializes a new ETreeMemoryCallbacksModel object.
* ETreeMemoryCallbacksModel is an implementaiton of the somewhat
* abstract class ETreeMemory. The ETreeMemoryCallbacksModel is
* designed to allow people to easily create ETreeMemorys without
* having to create a new GtkType derived from ETreeMemory every time
* they need one.
*
* Instead, ETreeMemoryCallbacksModel uses a setup based in callback functions, every
* callback function signature mimics the signature of each ETreeModel method
* and passes the extra @data pointer to each one of the method to provide them
* with any context they might want to use.
*
* ETreeMemoryCallbacks is to ETreeMemory as ETableSimple is to ETableModel.
*
* Return value: An ETreeMemoryCallbacks object (which is also an
* ETreeMemory and thus an ETreeModel object).
*
*/
ETreeModel *
e_tree_memory_callbacks_new (ETreeMemoryCallbacksIconAtFn icon_at,
ETreeMemoryCallbacksColumnCountFn column_count,
ETreeMemoryCallbacksHasSaveIdFn has_save_id,
ETreeMemoryCallbacksGetSaveIdFn get_save_id,
ETreeMemoryCallbacksValueAtFn value_at,
ETreeMemoryCallbacksSetValueAtFn set_value_at,
ETreeMemoryCallbacksIsEditableFn is_editable,
ETreeMemoryCallbacksDuplicateValueFn duplicate_value,
ETreeMemoryCallbacksFreeValueFn free_value,
ETreeMemoryCallbacksInitializeValueFn initialize_value,
ETreeMemoryCallbacksValueIsEmptyFn value_is_empty,
ETreeMemoryCallbacksValueToStringFn value_to_string,
gpointer model_data)
{
ETreeMemoryCallbacks *etmc;
etmc = gtk_type_new (e_tree_memory_callbacks_get_type ());
etmc->icon_at = icon_at;
etmc->column_count = column_count;
etmc->has_save_id = has_save_id;
etmc->get_save_id = get_save_id;
etmc->value_at = value_at;
etmc->set_value_at = set_value_at;
etmc->is_editable = is_editable;
etmc->duplicate_value = duplicate_value;
etmc->free_value = free_value;
etmc->initialize_value = initialize_value;
etmc->value_is_empty = value_is_empty;
etmc->value_to_string = value_to_string;
etmc->model_data = model_data;
return (ETreeModel*)etmc;
}
