path: root/widgets/table/e-table-memory-callbacks.c

/*
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-util/e-util.h"

#include "e-table-memory-callbacks.h"

G_DEFINE_TYPE (ETableMemoryCallbacks, e_table_memory_callbacks, E_TYPE_TABLE_MEMORY)

static gint
etmc_column_count (ETableModel *etm)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->col_count)
        return etmc->col_count (etm, etmc->data);
    else
        return 0;
}

static gpointer
etmc_value_at (ETableModel *etm,
               gint col,
               gint row)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->value_at)
        return etmc->value_at (etm, col, row, etmc->data);
    else
        return NULL;
}

static void
etmc_set_value_at (ETableModel *etm,
                   gint col,
                   gint row,
                   gconstpointer val)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->set_value_at)
        etmc->set_value_at (etm, col, row, val, etmc->data);
}

static gboolean
etmc_is_cell_editable (ETableModel *etm,
                       gint col,
                       gint row)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->is_cell_editable)
        return etmc->is_cell_editable (etm, col, row, etmc->data);
    else
        return FALSE;
}

/* The default for etmc_duplicate_value is to return the raw value. */
static gpointer
etmc_duplicate_value (ETableModel *etm,
                      gint col,
                      gconstpointer value)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->duplicate_value)
        return etmc->duplicate_value (etm, col, value, etmc->data);
    else
        return (gpointer) value;
}

static void
etmc_free_value (ETableModel *etm,
                 gint col,
                 gpointer value)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->free_value)
        etmc->free_value (etm, col, value, etmc->data);
}

static gpointer
etmc_initialize_value (ETableModel *etm,
                       gint col)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->initialize_value)
        return etmc->initialize_value (etm, col, etmc->data);
    else
        return NULL;
}

static gboolean
etmc_value_is_empty (ETableModel *etm,
                     gint col,
                     gconstpointer value)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->value_is_empty)
        return etmc->value_is_empty (etm, col, value, etmc->data);
    else
        return FALSE;
}

static gchar *
etmc_value_to_string (ETableModel *etm,
                      gint col,
                      gconstpointer value)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->value_to_string)
        return etmc->value_to_string (etm, col, value, etmc->data);
    else
        return g_strdup ("");
}

static void
etmc_append_row (ETableModel *etm,
                 ETableModel *source,
                 gint row)
{
    ETableMemoryCallbacks *etmc = E_TABLE_MEMORY_CALLBACKS (etm);

    if (etmc->append_row)
        etmc->append_row (etm, source, row, etmc->data);
}

static void
e_table_memory_callbacks_class_init (ETableMemoryCallbacksClass *class)
{
    ETableModelClass *model_class = E_TABLE_MODEL_CLASS (class);

    model_class->column_count     = etmc_column_count;
    model_class->value_at         = etmc_value_at;
    model_class->set_value_at     = etmc_set_value_at;
    model_class->is_cell_editable = etmc_is_cell_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;
    model_class->append_row       = etmc_append_row;

}

static void
e_table_memory_callbacks_init (ETableMemoryCallbacks *etmc)
{
    /* nothing to do */
}

/**
 * e_table_memory_callbacks_new:
 * @col_count:
 * @value_at:
 * @set_value_at:
 * @is_cell_editable:
 * @duplicate_value:
 * @free_value:
 * @initialize_value:
 * @value_is_empty:
 * @value_to_string:
 * @data: closure pointer.
 *
 * This initializes a new ETableMemoryCallbacksModel object.
 * ETableMemoryCallbacksModel is an implementaiton of the abstract class
 * ETableModel.  The ETableMemoryCallbacksModel is designed to allow people
 * to easily create ETableModels without having to create a new GType
 * derived from ETableModel every time they need one.
 *
 * Instead, ETableMemoryCallbacksModel uses a setup based in callback
 * functions, every callback function signature mimics the signature of
 * each ETableModel method and passes the extra @data pointer to each one
 * of the method to provide them with any context they might want to use.
 *
 * Returns: An ETableMemoryCallbacksModel object (which is also an ETableModel
 * object).
 */
ETableModel *
e_table_memory_callbacks_new (ETableMemoryCallbacksColumnCountFn col_count,
                              ETableMemoryCallbacksValueAtFn value_at,
                              ETableMemoryCallbacksSetValueAtFn set_value_at,
                              ETableMemoryCallbacksIsCellEditableFn is_cell_editable,
                              ETableMemoryCallbacksDuplicateValueFn duplicate_value,
                              ETableMemoryCallbacksFreeValueFn free_value,
                              ETableMemoryCallbacksInitializeValueFn initialize_value,
                              ETableMemoryCallbacksValueIsEmptyFn value_is_empty,
                              ETableMemoryCallbacksValueToStringFn value_to_string,
                              gpointer data)
{
    ETableMemoryCallbacks *et;

    et = g_object_new (E_TYPE_TABLE_MEMORY_CALLBACKS, NULL);

    et->col_count        = col_count;
    et->value_at         = value_at;
    et->set_value_at     = set_value_at;
    et->is_cell_editable = is_cell_editable;
    et->duplicate_value  = duplicate_value;
    et->free_value       = free_value;
    et->initialize_value = initialize_value;
    et->value_is_empty   = value_is_empty;
    et->value_to_string  = value_to_string;
    et->data             = data;

    return (ETableModel *) et;
 }