evolution/widgets/table/e-table-memory.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * e-table-memory.c: a Table Model implementation that the programmer builds in memory.
 *
 * Author:
 *   Chris Toshok (toshok@ximian.com)
 *   Chris Lahey <clahey@ximian.com>
 *
 * Adapted from the gtable code and ETableModel.
 *
 * (C) 2000, 2001 Ximian, Inc.
 */
#include <config.h>

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>

#include <gnome-xml/parser.h>
#include <gnome-xml/xmlmemory.h>

#include <gtk/gtksignal.h>
#include <stdlib.h>
#include "gal/util/e-util.h"
#include "gal/util/e-xml-utils.h"
#include "e-table-memory.h"

#define PARENT_TYPE E_TABLE_MODEL_TYPE

static ETableModel *parent_class;

struct ETableMemoryPriv {
	gpointer *data;
	int num_rows;
	gint frozen;
};


/* virtual methods */

static void
etmm_destroy (GtkObject *object)
{
	ETableMemory *etmm = E_TABLE_MEMORY (object);
	ETableMemoryPriv *priv = etmm->priv;

	/* XXX lots of stuff to free here */

	g_free (priv->data);
	g_free (priv);

	GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static int
etmm_row_count (ETableModel *etm)
{
	ETableMemory *etmm = E_TABLE_MEMORY (etm);

	return etmm->priv->num_rows;
}


static void
e_table_memory_class_init (GtkObjectClass *klass)
{
	ETableModelClass *table_class = (ETableModelClass *) klass;

	parent_class               = gtk_type_class (PARENT_TYPE);
	
	klass->destroy             = etmm_destroy;

	table_class->row_count     = etmm_row_count;
}

static void
e_table_memory_init (GtkObject *object)
{
	ETableMemory *etmm = (ETableMemory *)object;

	ETableMemoryPriv *priv;

	priv = g_new0 (ETableMemoryPriv, 1);
	etmm->priv = priv;

	priv->data = NULL;
	priv->num_rows = 0;
	priv->frozen = 0;
}

E_MAKE_TYPE(e_table_memory, "ETableMemory", ETableMemory, e_table_memory_class_init, e_table_memory_init, PARENT_TYPE)



/**
 * e_table_memory_construct:
 * @etable: 
 * 
 * 
 **/
void
e_table_memory_construct (ETableMemory *etmm)
{
}

/**
 * e_table_memory_new
 *
 * XXX docs here.
 *
 * return values: a newly constructed ETableMemory.
 */
ETableMemory *
e_table_memory_new (void)
{
	ETableMemory *etmm;

	etmm = gtk_type_new (e_table_memory_get_type ());

	e_table_memory_construct(etmm);

	return etmm;
}

/**
 * e_table_memory_get_data:
 * @etmm: 
 * @row: 
 * 
 * 
 * 
 * Return value: 
 **/
gpointer
e_table_memory_get_data (ETableMemory *etmm, int row)
{
	g_return_val_if_fail(row >= 0, NULL);
	g_return_val_if_fail(row < etmm->priv->num_rows, NULL);

	return etmm->priv->data[row];
}

/**
 * e_table_memory_set_data:
 * @etmm: 
 * @row: 
 * @data: 
 * 
 * 
 **/
void
e_table_memory_set_data (ETableMemory *etmm, int row, gpointer data)
{
	g_return_if_fail(row >= 0);
	g_return_if_fail(row < etmm->priv->num_rows);

	etmm->priv->data[row] = data;
}

/**
 * e_table_memory_insert:
 * @table_model: 
 * @parent_path: 
 * @position: 
 * @data: 
 * 
 * 
 * 
 * Return value: 
 **/
void
e_table_memory_insert (ETableMemory *etmm,
		       int row,
		       gpointer data)
{
	g_return_if_fail(row >= -1);
	g_return_if_fail(row <= etmm->priv->num_rows);

	if (!etmm->priv->frozen)
		e_table_model_pre_change(E_TABLE_MODEL(etmm));

	if (row == -1)
		row = etmm->priv->num_rows;
	etmm->priv->data = g_renew(gpointer, etmm->priv->data, etmm->priv->num_rows + 1);
	memmove(etmm->priv->data + row + 1, etmm->priv->data + row, (etmm->priv->num_rows - row) * sizeof (gpointer));
	etmm->priv->data[row] = data;
	etmm->priv->num_rows ++;
	if (!etmm->priv->frozen)
		e_table_model_row_inserted(E_TABLE_MODEL(etmm), row);
}



/**
 * e_table_memory_remove:
 * @etable: 
 * @path: 
 * 
 * 
 * 
 * Return value: 
 **/
gpointer
e_table_memory_remove (ETableMemory *etmm, int row)
{
	gpointer ret;

	g_return_val_if_fail(row >= 0, NULL);
	g_return_val_if_fail(row < etmm->priv->num_rows, NULL);

	if (!etmm->priv->frozen)
		e_table_model_pre_change(E_TABLE_MODEL(etmm));
	ret = etmm->priv->data[row];
	memmove(etmm->priv->data + row, etmm->priv->data + row + 1, (etmm->priv->num_rows - row - 1) * sizeof (gpointer));
	etmm->priv->num_rows --;
	if (!etmm->priv->frozen)
		e_table_model_row_deleted(E_TABLE_MODEL(etmm), row);
	return ret;
}

/**
 * e_table_memory_clear:
 * @etable: 
 * @path: 
 * 
 * 
 * 
 * Return value: 
 **/
void
e_table_memory_clear (ETableMemory *etmm)
{
	if (!etmm->priv->frozen)
		e_table_model_pre_change(E_TABLE_MODEL(etmm));
	g_free(etmm->priv->data);
	etmm->priv->data = NULL;
	etmm->priv->num_rows = 0;
	if (!etmm->priv->frozen)
		e_table_model_changed(E_TABLE_MODEL(etmm));
}

/**
 * e_table_memory_freeze:
 * @etmm: the ETableModel to freeze.
 * 
 * This function prepares an ETableModel for a period of much change.
 * All signals regarding changes to the table are deferred until we
 * thaw the table.
 * 
 **/
void
e_table_memory_freeze(ETableMemory *etmm)
{
	ETableMemoryPriv *priv = etmm->priv;

	if (priv->frozen == 0)
		e_table_model_pre_change(E_TABLE_MODEL(etmm));

	priv->frozen ++;
}

/**
 * e_table_memory_thaw:
 * @etmm: the ETableMemory to thaw.
 * 
 * This function thaws an ETableMemory.  All the defered signals can add
 * up to a lot, we don't know - so we just emit a model_changed
 * signal.
 * 
 **/
void
e_table_memory_thaw(ETableMemory *etmm)
{
	ETableMemoryPriv *priv = etmm->priv;

	if (priv->frozen > 0)
		priv->frozen --;
	if (priv->frozen == 0) {
		e_table_model_changed(E_TABLE_MODEL(etmm));
	}
}