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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* 
 * e-table-memory-store.c
 * Copyright 2000, 2001, Ximian, Inc.
 *
 * Authors:
 *   Chris Lahey <clahey@ximian.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License, version 2, as published by the Free Software Foundation.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <config.h>
#include <string.h>
#include "e-table-memory-store.h"

#define PARENT_TYPE e_table_memory_get_type ()

#define STORE_LOCATOR(etms, col, row) (*((etms)->priv->store + (row) * (etms)->priv->col_count + (col)))

struct _ETableMemoryStorePrivate {
    int col_count;
    ETableMemoryStoreColumnInfo *columns;
    void **store;
};

static void *
duplicate_value (ETableMemoryStore *etms, int col, const void *val)
{
    switch (etms->priv->columns[col].type) {
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_STRING:
        return g_strdup (val);
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_PIXBUF:
        if (val)
            gdk_pixbuf_ref ((GdkPixbuf *) val);
        return (GdkPixbuf *) val;
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_CUSTOM:
        if (etms->priv->columns[col].custom.duplicate_value)
            return etms->priv->columns[col].custom.duplicate_value (E_TABLE_MODEL (etms), col, val, NULL);
        break;
    default:
        break;
    }
    return (void *) val;
}

static int
etms_column_count (ETableModel *etm)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);

    return etms->priv->col_count;
}

static void *
etms_value_at (ETableModel *etm, int col, int row)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);

    return STORE_LOCATOR (etms, col, row);
}

static void
etms_set_value_at (ETableModel *etm, int col, int row, const void *val)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);

    STORE_LOCATOR (etms, col, row) = duplicate_value (etms, col, val);

    e_table_model_cell_changed (etm, col, row);
}

static gboolean
etms_is_cell_editable (ETableModel *etm, int col, int row)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);

    return etms->priv->columns[col].editable;
}

/* The default for etms_duplicate_value is to return the raw value. */
static void *
etms_duplicate_value (ETableModel *etm, int col, const void *value)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);

    return duplicate_value (etms, col, value);
}

static void
etms_free_value (ETableModel *etm, int col, void *value)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);

    switch (etms->priv->columns[col].type) {
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_STRING:
        g_free (value);
        break;
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_PIXBUF:
        if (value)
            gdk_pixbuf_unref (value);
        break;
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_CUSTOM:
        if (etms->priv->columns[col].custom.free_value)
            etms->priv->columns[col].custom.free_value (E_TABLE_MODEL (etms), col, value, NULL);
        break;
    default:
        break;
    }
}

static void *
etms_initialize_value (ETableModel *etm, int col)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);
    
    switch (etms->priv->columns[col].type) {
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_STRING:
        return g_strdup ("");
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_PIXBUF:
        return NULL;
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_CUSTOM:
        if (etms->priv->columns[col].custom.initialize_value)
            return etms->priv->columns[col].custom.initialize_value (E_TABLE_MODEL (etms), col, NULL);
        break;
    default:
        break;
    }
    return 0;
}

static gboolean
etms_value_is_empty (ETableModel *etm, int col, const void *value)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);
    
    switch (etms->priv->columns[col].type) {
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_STRING:
        return !(value && *(char *) value);
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_PIXBUF:
        return value == NULL;
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_CUSTOM:
        if (etms->priv->columns[col].custom.value_is_empty)
            return etms->priv->columns[col].custom.value_is_empty (E_TABLE_MODEL (etms), col, value, NULL);
        break;
    default:
        break;
    }
    return value == 0;
}

static char *
etms_value_to_string (ETableModel *etm, int col, const void *value)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);
    
    switch (etms->priv->columns[col].type) {
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_STRING:
        return g_strdup (value);
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_PIXBUF:
        return g_strdup ("");
    case E_TABLE_MEMORY_STORE_COLUMN_TYPE_CUSTOM:
        if (etms->priv->columns[col].custom.value_is_empty)
            return etms->priv->columns[col].custom.value_to_string (E_TABLE_MODEL (etms), col, value, NULL);
        break;
    default:
        break;
    }
    return g_strdup_printf ("%d", GPOINTER_TO_INT (value));
}

static void
etms_append_row (ETableModel *etm, ETableModel *source, int row)
{
    ETableMemoryStore *etms = E_TABLE_MEMORY_STORE(etm);
    void **new_data;
    int i;
    int row_count;

    new_data = g_new (void *, etms->priv->col_count);

    for (i = 0; i < etms->priv->col_count; i++) {
        new_data[i] = e_table_model_value_at (source, i, row);
    }

    row_count = e_table_model_row_count (E_TABLE_MODEL (etms));

    e_table_memory_store_insert (etms, row_count, new_data, NULL);
}

static void
e_table_memory_store_init (ETableMemoryStore *etms)
{
    etms->priv            = g_new (ETableMemoryStorePrivate, 1);

    etms->priv->col_count = 0;
    etms->priv->columns   = NULL;
    etms->priv->store     = NULL;
}

static void
e_table_memory_store_class_init (GtkObjectClass *object_class)
{
    ETableModelClass *model_class = (ETableModelClass *) object_class;

    model_class->column_count     = etms_column_count;
    model_class->value_at         = etms_value_at;
    model_class->set_value_at     = etms_set_value_at;
    model_class->is_cell_editable = etms_is_cell_editable;
    model_class->duplicate_value  = etms_duplicate_value;
    model_class->free_value       = etms_free_value;
    model_class->initialize_value = etms_initialize_value;
    model_class->value_is_empty   = etms_value_is_empty;
    model_class->value_to_string  = etms_value_to_string;
    model_class->append_row       = etms_append_row;
}

GtkType
e_table_memory_store_get_type (void)
{
    static GtkType type = 0;

    if (!type){
        GtkTypeInfo info = {
            "ETableMemoryStore",
            sizeof (ETableMemoryStore),
            sizeof (ETableMemoryStoreClass),
            (GtkClassInitFunc) e_table_memory_store_class_init,
            (GtkObjectInitFunc) e_table_memory_store_init,
            NULL, /* reserved 1 */
            NULL, /* reserved 2 */
            (GtkClassInitFunc) NULL
        };

        type = gtk_type_unique (PARENT_TYPE, &info);
    }

    return type;
}

/**
 * e_table_memory_store_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 ETableMemoryStoreModel object.  ETableMemoryStoreModel is
 * an implementaiton of the abstract class ETableModel.  The ETableMemoryStoreModel
 * is designed to allow people to easily create ETableModels without having
 * to create a new GtkType derived from ETableModel every time they need one.
 *
 * Instead, ETableMemoryStoreModel 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 ETableMemoryStoreModel object (which is also an ETableModel
 * object).
 */
ETableModel *
e_table_memory_store_new (ETableMemoryStoreColumnInfo *columns)
{
    ETableMemoryStore *et;

    et = gtk_type_new (e_table_memory_store_get_type ());

    if (e_table_memory_store_construct (et, columns)) {
        return (ETableModel *) et;
    } else {
        gtk_object_unref (GTK_OBJECT (et));
        return NULL;
    }
}

ETableModel *
e_table_memory_store_construct (ETableMemoryStore *etms, ETableMemoryStoreColumnInfo *columns)
{
    int i;
    for (i = 0; columns[i].type != E_TABLE_MEMORY_STORE_COLUMN_TYPE_TERMINATOR; i++)
        /* Intentionally blank */;
    etms->priv->col_count = i;

    etms->priv->columns = g_new (ETableMemoryStoreColumnInfo, etms->priv->col_count + 1);

    memcpy (etms->priv->columns, columns, (etms->priv->col_count + 1) * sizeof (ETableMemoryStoreColumnInfo));

    return E_TABLE_MODEL (etms);
}
                

void
e_table_memory_store_adopt_value_at (ETableMemoryStore *etms, int col, int row, void *value)
{
    STORE_LOCATOR (etms, col, row) = value;

    e_table_model_cell_changed (E_TABLE_MODEL (etms), col, row);
}

/* The size of these arrays is the number of columns. */
void
e_table_memory_store_insert (ETableMemoryStore *etms, int row, void **store, gpointer data)
{
    int row_count;
    int i;

    e_table_memory_insert (E_TABLE_MEMORY (etms), row, data);

    row_count = e_table_model_row_count (E_TABLE_MODEL (etms));
    if (row == -1)
        row = row_count - 1;
    etms->priv->store = g_realloc (etms->priv->store, etms->priv->col_count * row_count * sizeof (void *));
    memmove (etms->priv->store + etms->priv->col_count * (row + 1),
         etms->priv->store + etms->priv->col_count * row,
         etms->priv->col_count * (row_count - row - 1) * sizeof (void *));

    for (i = 0; i < etms->priv->col_count; i++) {
        STORE_LOCATOR(etms, i, row) = duplicate_value(etms, i, store[i]);
    }
}

void
e_table_memory_store_insert_list (ETableMemoryStore *etms, int row, gpointer data, ...)
{
    void **store;
    va_list args;
    int i;

    store = g_new (void *, etms->priv->col_count + 1);

    va_start (args, data);
    for (i = 0; i < etms->priv->col_count; i++) {
        store[i] = va_arg (args, void *);
    }
    va_end (args);

    e_table_memory_store_insert (etms, row, store, data);

    g_free (store);
}

void
e_table_memory_store_insert_adopt (ETableMemoryStore *etms, int row, void **store, gpointer data)
{
    int row_count;
    int i;

    e_table_memory_insert (E_TABLE_MEMORY (etms), row, data);

    row_count = e_table_model_row_count (E_TABLE_MODEL (etms));
    if (row == -1)
        row = row_count - 1;
    etms->priv->store = g_realloc (etms->priv->store, etms->priv->col_count * row_count * sizeof (void *));
    memmove (etms->priv->store + etms->priv->col_count * (row + 1),
         etms->priv->store + etms->priv->col_count * row,
         etms->priv->col_count * (row_count - row - 1) * sizeof (void *));

    for (i = 0; i < etms->priv->col_count; i++) {
        STORE_LOCATOR(etms, i, row) = store[i];
    }
}

void
e_table_memory_store_remove (ETableMemoryStore *etms, int row)
{
    int row_count;

    e_table_memory_remove (E_TABLE_MEMORY (etms), row);

    row_count = e_table_model_row_count (E_TABLE_MODEL (etms));
    memmove (etms->priv->store + etms->priv->col_count * row,
         etms->priv->store + etms->priv->col_count * (row + 1),
         etms->priv->col_count * (row_count - row) * sizeof (void *));
    etms->priv->store = g_realloc (etms->priv->store, etms->priv->col_count * row_count * sizeof (void *));
}

void
e_table_memory_store_clear (ETableMemoryStore *etms)
{
    e_table_memory_clear (E_TABLE_MEMORY (etms));

    g_free (etms->priv->store);
    etms->priv->store = NULL;
}