path: root/widgets/table/e-table-sorted-variable.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)
 *
 */

#include <config.h>

#include <stdlib.h>
#include <string.h>

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

#include "e-table-sorted-variable.h"
#include "e-table-sorting-utils.h"

#define d(x)

#define INCREMENT_AMOUNT 100

/* maximum insertions between an idle event that we will do without scheduling an idle sort */
#define ETSV_INSERT_MAX (4)

/* workaround for avoiding API breakage */
#define etsv_get_type e_table_sorted_variable_get_type
G_DEFINE_TYPE (ETableSortedVariable, etsv, E_TABLE_SUBSET_VARIABLE_TYPE)

static void etsv_sort_info_changed        (ETableSortInfo *info, ETableSortedVariable *etsv);
static void etsv_sort                     (ETableSortedVariable *etsv);
static void etsv_add                      (ETableSubsetVariable *etssv, gint                  row);
static void etsv_add_all                  (ETableSubsetVariable *etssv);

static void
etsv_dispose (GObject *object)
{
    ETableSortedVariable *etsv = E_TABLE_SORTED_VARIABLE (object);

    if (etsv->sort_info_changed_id)
        g_signal_handler_disconnect (G_OBJECT (etsv->sort_info),
                         etsv->sort_info_changed_id);
    etsv->sort_info_changed_id = 0;

    if (etsv->sort_idle_id) {
        g_source_remove (etsv->sort_idle_id);
        etsv->sort_idle_id = 0;
    }
    if (etsv->insert_idle_id) {
        g_source_remove (etsv->insert_idle_id);
        etsv->insert_idle_id = 0;
    }

    if (etsv->sort_info)
        g_object_unref (etsv->sort_info);
    etsv->sort_info = NULL;

    if (etsv->full_header)
        g_object_unref (etsv->full_header);
    etsv->full_header = NULL;

    G_OBJECT_CLASS (etsv_parent_class)->dispose (object);
}

static void
etsv_class_init (ETableSortedVariableClass *klass)
{
    ETableSubsetVariableClass *etssv_class = E_TABLE_SUBSET_VARIABLE_CLASS (klass);
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    object_class->dispose = etsv_dispose;

    etssv_class->add = etsv_add;
    etssv_class->add_all = etsv_add_all;
}

static void
etsv_init (ETableSortedVariable *etsv)
{
    etsv->full_header = NULL;
    etsv->sort_info = NULL;

    etsv->sort_info_changed_id = 0;

    etsv->sort_idle_id = 0;
    etsv->insert_count = 0;
}

static gboolean
etsv_sort_idle (ETableSortedVariable *etsv)
{
    g_object_ref (etsv);
    etsv_sort (etsv);
    etsv->sort_idle_id = 0;
    etsv->insert_count = 0;
    g_object_unref (etsv);
    return FALSE;
}

static gboolean
etsv_insert_idle (ETableSortedVariable *etsv)
{
    etsv->insert_count = 0;
    etsv->insert_idle_id = 0;
    return FALSE;
}

static void
etsv_add       (ETableSubsetVariable *etssv,
        gint                  row)
{
    ETableModel *etm = E_TABLE_MODEL (etssv);
    ETableSubset *etss = E_TABLE_SUBSET (etssv);
    ETableSortedVariable *etsv = E_TABLE_SORTED_VARIABLE (etssv);
    gint i;

    e_table_model_pre_change (etm);

    if (etss->n_map + 1 > etssv->n_vals_allocated) {
        etssv->n_vals_allocated += INCREMENT_AMOUNT;
        etss->map_table = g_realloc (etss->map_table, (etssv->n_vals_allocated) * sizeof (gint));
    }
    i = etss->n_map;
    if (etsv->sort_idle_id == 0) {
        /* this is to see if we're inserting a lot of things between idle loops.
           If we are, we're busy, its faster to just append and perform a full sort later */
        etsv->insert_count++;
        if (etsv->insert_count > ETSV_INSERT_MAX) {
            /* schedule a sort, and append instead */
            etsv->sort_idle_id = g_idle_add_full (50, (GSourceFunc) etsv_sort_idle, etsv, NULL);
        } else {
            /* make sure we have an idle handler to reset the count every now and then */
            if (etsv->insert_idle_id == 0) {
                etsv->insert_idle_id = g_idle_add_full (40, (GSourceFunc) etsv_insert_idle, etsv, NULL);
            }
            i = e_table_sorting_utils_insert (etss->source, etsv->sort_info, etsv->full_header, etss->map_table, etss->n_map, row);
            memmove (etss->map_table + i + 1, etss->map_table + i, (etss->n_map - i) * sizeof (gint));
        }
    }
    etss->map_table[i] = row;
    etss->n_map++;

    e_table_model_row_inserted (etm, i);
}

static void
etsv_add_all   (ETableSubsetVariable *etssv)
{
    ETableModel *etm = E_TABLE_MODEL (etssv);
    ETableSubset *etss = E_TABLE_SUBSET (etssv);
    ETableSortedVariable *etsv = E_TABLE_SORTED_VARIABLE (etssv);
    gint rows;
    gint i;

    e_table_model_pre_change (etm);

    rows = e_table_model_row_count (etss->source);

    if (etss->n_map + rows > etssv->n_vals_allocated) {
        etssv->n_vals_allocated += MAX (INCREMENT_AMOUNT, rows);
        etss->map_table = g_realloc (etss->map_table, etssv->n_vals_allocated * sizeof (gint));
    }
    for (i = 0; i < rows; i++)
        etss->map_table[etss->n_map++] = i;

    if (etsv->sort_idle_id == 0) {
        etsv->sort_idle_id = g_idle_add_full (50, (GSourceFunc) etsv_sort_idle, etsv, NULL);
    }

    e_table_model_changed (etm);
}

ETableModel *
e_table_sorted_variable_new (ETableModel *source, ETableHeader *full_header, ETableSortInfo *sort_info)
{
    ETableSortedVariable *etsv = g_object_new (E_TABLE_SORTED_VARIABLE_TYPE, NULL);
    ETableSubsetVariable *etssv = E_TABLE_SUBSET_VARIABLE (etsv);

    if (e_table_subset_variable_construct (etssv, source) == NULL) {
        g_object_unref (etsv);
        return NULL;
    }

    etsv->sort_info = sort_info;
    g_object_ref (etsv->sort_info);
    etsv->full_header = full_header;
    g_object_ref (etsv->full_header);

    etsv->sort_info_changed_id = g_signal_connect (G_OBJECT (sort_info), "sort_info_changed",
                               G_CALLBACK (etsv_sort_info_changed), etsv);

    return E_TABLE_MODEL (etsv);
}

static void
etsv_sort_info_changed (ETableSortInfo *info, ETableSortedVariable *etsv)
{
    etsv_sort (etsv);
}

static void
etsv_sort (ETableSortedVariable *etsv)
{
    ETableSubset *etss = E_TABLE_SUBSET (etsv);
    static gint reentering = 0;
    if (reentering)
        return;
    reentering = 1;

    e_table_model_pre_change (E_TABLE_MODEL (etsv));

    e_table_sorting_utils_sort (etss->source, etsv->sort_info, etsv->full_header, etss->map_table, etss->n_map);

    e_table_model_changed (E_TABLE_MODEL (etsv));
    reentering = 0;
}