path: root/widgets/table/e-table-sorter.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 <glib/gi18n.h>
#include "e-util/e-util.h"

#include "e-table-sorter.h"
#include "e-table-sorting-utils.h"

#define d(x)

/* The arguments we take */
enum {
    PROP_0,
    PROP_SORT_INFO
};

/* workaround for avoiding API breakage */
#define ets_get_type e_table_sorter_get_type
G_DEFINE_TYPE (ETableSorter, ets, E_SORTER_TYPE)

#define INCREMENT_AMOUNT 100

static void ets_model_changed      (ETableModel *etm, ETableSorter *ets);
static void ets_model_row_changed  (ETableModel *etm, gint row, ETableSorter *ets);
static void ets_model_cell_changed (ETableModel *etm, gint col, gint row, ETableSorter *ets);
static void ets_model_rows_inserted (ETableModel *etm, gint row, gint count, ETableSorter *ets);
static void ets_model_rows_deleted (ETableModel *etm, gint row, gint count, ETableSorter *ets);
static void ets_sort_info_changed  (ETableSortInfo *info, ETableSorter *ets);
static void ets_clean              (ETableSorter *ets);
static void ets_sort               (ETableSorter *ets);
static void ets_backsort           (ETableSorter *ets);

static gint ets_model_to_sorted           (ESorter *sorter, gint row);
static gint ets_sorted_to_model           (ESorter *sorter, gint row);
static void ets_get_model_to_sorted_array (ESorter *sorter, gint **array, gint *count);
static void ets_get_sorted_to_model_array (ESorter *sorter, gint **array, gint *count);
static gboolean ets_needs_sorting             (ESorter *ets);

static void
ets_dispose (GObject *object)
{
    ETableSorter *ets = E_TABLE_SORTER (object);

    if (ets->sort_info) {
        if (ets->table_model_changed_id)
            g_signal_handler_disconnect (ets->source,
                             ets->table_model_changed_id);
        if (ets->table_model_row_changed_id)
            g_signal_handler_disconnect (ets->source,
                             ets->table_model_row_changed_id);
        if (ets->table_model_cell_changed_id)
            g_signal_handler_disconnect (ets->source,
                             ets->table_model_cell_changed_id);
        if (ets->table_model_rows_inserted_id)
            g_signal_handler_disconnect (ets->source,
                             ets->table_model_rows_inserted_id);
        if (ets->table_model_rows_deleted_id)
            g_signal_handler_disconnect (ets->source,
                             ets->table_model_rows_deleted_id);
        if (ets->sort_info_changed_id)
            g_signal_handler_disconnect (ets->sort_info,
                             ets->sort_info_changed_id);
        if (ets->group_info_changed_id)
            g_signal_handler_disconnect (ets->sort_info,
                             ets->group_info_changed_id);

        ets->table_model_changed_id = 0;
        ets->table_model_row_changed_id = 0;
        ets->table_model_cell_changed_id = 0;
        ets->table_model_rows_inserted_id = 0;
        ets->table_model_rows_deleted_id = 0;
        ets->sort_info_changed_id = 0;
        ets->group_info_changed_id = 0;

        g_object_unref(ets->sort_info);
        ets->sort_info = NULL;
    }

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

    if (ets->source)
        g_object_unref(ets->source);
    ets->source = NULL;

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

static void
ets_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
    ETableSorter *ets = E_TABLE_SORTER (object);

    switch (prop_id) {
    case PROP_SORT_INFO:
        if (ets->sort_info) {
            if (ets->sort_info_changed_id)
                g_signal_handler_disconnect(ets->sort_info, ets->sort_info_changed_id);
            if (ets->group_info_changed_id)
                g_signal_handler_disconnect(ets->sort_info, ets->group_info_changed_id);
            g_object_unref(ets->sort_info);
        }

        ets->sort_info = E_TABLE_SORT_INFO(g_value_get_object (value));
        g_object_ref(ets->sort_info);
        ets->sort_info_changed_id = g_signal_connect (ets->sort_info, "sort_info_changed",
                                  G_CALLBACK (ets_sort_info_changed), ets);
        ets->group_info_changed_id = g_signal_connect (ets->sort_info, "group_info_changed",
                                   G_CALLBACK (ets_sort_info_changed), ets);

        ets_clean (ets);
        break;
    default:
        break;
    }
}

static void
ets_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    ETableSorter *ets = E_TABLE_SORTER (object);
    switch (prop_id) {
    case PROP_SORT_INFO:
        g_value_set_object (value, ets->sort_info);
        break;
    }
}

static void
ets_class_init (ETableSorterClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS(klass);
    ESorterClass *sorter_class = E_SORTER_CLASS(klass);

    object_class->dispose                   = ets_dispose;
    object_class->set_property              = ets_set_property;
    object_class->get_property              = ets_get_property;

    sorter_class->model_to_sorted           = ets_model_to_sorted;
    sorter_class->sorted_to_model           = ets_sorted_to_model;
    sorter_class->get_model_to_sorted_array = ets_get_model_to_sorted_array;
    sorter_class->get_sorted_to_model_array = ets_get_sorted_to_model_array;
    sorter_class->needs_sorting             = ets_needs_sorting;

    g_object_class_install_property (object_class, PROP_SORT_INFO,
                     g_param_spec_object ("sort_info",
                                  "Sort Info",
                                  NULL,
                                  E_TABLE_SORT_INFO_TYPE,
                                  G_PARAM_READWRITE));
}

static void
ets_init (ETableSorter *ets)
{
    ets->full_header = NULL;
    ets->sort_info = NULL;
    ets->source = NULL;

    ets->needs_sorting = -1;

    ets->table_model_changed_id = 0;
    ets->table_model_row_changed_id = 0;
    ets->table_model_cell_changed_id = 0;
    ets->table_model_rows_inserted_id = 0;
    ets->table_model_rows_deleted_id = 0;
    ets->sort_info_changed_id = 0;
    ets->group_info_changed_id = 0;
}

ETableSorter *
e_table_sorter_new (ETableModel *source, ETableHeader *full_header, ETableSortInfo *sort_info)
{
    ETableSorter *ets = g_object_new (E_TABLE_SORTER_TYPE, NULL);

    ets->sort_info = sort_info;
    g_object_ref(ets->sort_info);
    ets->full_header = full_header;
    g_object_ref(ets->full_header);
    ets->source = source;
    g_object_ref(ets->source);

    ets->table_model_changed_id = g_signal_connect (source, "model_changed",
                            G_CALLBACK (ets_model_changed), ets);
    ets->table_model_row_changed_id = g_signal_connect (source, "model_row_changed",
                            G_CALLBACK (ets_model_row_changed), ets);
    ets->table_model_cell_changed_id = g_signal_connect (source, "model_cell_changed",
                            G_CALLBACK (ets_model_cell_changed), ets);
    ets->table_model_rows_inserted_id = g_signal_connect (source, "model_rows_inserted",
                            G_CALLBACK (ets_model_rows_inserted), ets);
    ets->table_model_rows_deleted_id = g_signal_connect (source, "model_rows_deleted",
                            G_CALLBACK (ets_model_rows_deleted), ets);
    ets->sort_info_changed_id = g_signal_connect (sort_info, "sort_info_changed",
                            G_CALLBACK (ets_sort_info_changed), ets);
    ets->group_info_changed_id = g_signal_connect (sort_info, "group_info_changed",
                            G_CALLBACK (ets_sort_info_changed), ets);

    return ets;
}

static void
ets_model_changed (ETableModel *etm, ETableSorter *ets)
{
    ets_clean(ets);
}

static void
ets_model_row_changed (ETableModel *etm, gint row, ETableSorter *ets)
{
    ets_clean(ets);
}

static void
ets_model_cell_changed (ETableModel *etm, gint col, gint row, ETableSorter *ets)
{
    ets_clean(ets);
}

static void
ets_model_rows_inserted (ETableModel *etm, gint row, gint count, ETableSorter *ets)
{
    ets_clean(ets);
}

static void
ets_model_rows_deleted (ETableModel *etm, gint row, gint count, ETableSorter *ets)
{
    ets_clean(ets);
}

static void
ets_sort_info_changed (ETableSortInfo *info, ETableSorter *ets)
{
    d(g_print ("sort info changed\n"));
    ets_clean(ets);
}

struct qsort_data {
    ETableSorter *ets;
    gpointer *vals;
    gint cols;
    gint *ascending;
    GCompareDataFunc *compare;
    gpointer cmp_cache;
};

/* FIXME: Make it not cache the second and later columns (as if anyone cares.) */

static gint
qsort_callback(gconstpointer data1, gconstpointer data2, gpointer user_data)
{
    struct qsort_data *qd = (struct qsort_data *) user_data;
    gint row1 = *(gint *)data1;
    gint row2 = *(gint *)data2;
    gint j;
    gint sort_count = e_table_sort_info_sorting_get_count (qd->ets->sort_info) + e_table_sort_info_grouping_get_count (qd->ets->sort_info);
    gint comp_val = 0;
    gint ascending = 1;
    for (j = 0; j < sort_count; j++) {
        comp_val = (*(qd->compare[j]))(qd->vals[qd->cols * row1 + j], qd->vals[qd->cols * row2 + j], qd->cmp_cache);
        ascending = qd->ascending[j];
        if (comp_val != 0)
            break;
    }
    if (comp_val == 0) {
        if (row1 < row2)
            comp_val = -1;
        if (row1 > row2)
            comp_val = 1;
    }
    if (!ascending)
        comp_val = -comp_val;
    return comp_val;
}

static void
ets_clean(ETableSorter *ets)
{
    g_free(ets->sorted);
    ets->sorted = NULL;

    g_free(ets->backsorted);
    ets->backsorted = NULL;

    ets->needs_sorting = -1;
}

static void
ets_sort(ETableSorter *ets)
{
    gint rows;
    gint i;
    gint j;
    gint cols;
    gint group_cols;
    struct qsort_data qd;

    if (ets->sorted)
        return;

    rows = e_table_model_row_count(ets->source);
    group_cols = e_table_sort_info_grouping_get_count(ets->sort_info);
    cols = e_table_sort_info_sorting_get_count(ets->sort_info) + group_cols;

    ets->sorted = g_new(int, rows);
    for (i = 0; i < rows; i++)
        ets->sorted[i] = i;

    qd.cols = cols;
    qd.ets = ets;

    qd.vals = g_new (gpointer , rows * cols);
    qd.ascending = g_new (int, cols);
    qd.compare = g_new (GCompareDataFunc, cols);
    qd.cmp_cache = e_table_sorting_utils_create_cmp_cache ();

    for (j = 0; j < cols; j++) {
        ETableSortColumn column;
        ETableCol *col;

        if (j < group_cols)
            column = e_table_sort_info_grouping_get_nth(ets->sort_info, j);
        else
            column = e_table_sort_info_sorting_get_nth(ets->sort_info, j - group_cols);

        col = e_table_header_get_column_by_col_idx(ets->full_header, column.column);
        if (col == NULL)
            col = e_table_header_get_column (ets->full_header, e_table_header_count (ets->full_header) - 1);

        for (i = 0; i < rows; i++) {
            qd.vals[i * cols + j] = e_table_model_value_at (ets->source, col->col_idx, i);
        }

        qd.compare[j] = col->compare;
        qd.ascending[j] = column.ascending;
    }

    g_qsort_with_data (ets->sorted, rows, sizeof(gint), qsort_callback, &qd);

    g_free (qd.vals);
    g_free (qd.ascending);
    g_free (qd.compare);
    e_table_sorting_utils_free_cmp_cache (qd.cmp_cache);
}

static void
ets_backsort(ETableSorter *ets)
{
    gint i, rows;

    if (ets->backsorted)
        return;

    ets_sort(ets);

    rows = e_table_model_row_count(ets->source);
    ets->backsorted = g_new0(int, rows);

    for (i = 0; i < rows; i++) {
        ets->backsorted[ets->sorted[i]] = i;
    }
}

static gint
ets_model_to_sorted (ESorter *es, gint row)
{
    ETableSorter *ets = E_TABLE_SORTER(es);
    gint rows = e_table_model_row_count(ets->source);

    g_return_val_if_fail(row >= 0, -1);
    g_return_val_if_fail(row < rows, -1);

    if (ets_needs_sorting(es))
        ets_backsort(ets);

    if (ets->backsorted)
        return ets->backsorted[row];
    else
        return row;
}

static gint
ets_sorted_to_model (ESorter *es, gint row)
{
    ETableSorter *ets = E_TABLE_SORTER(es);
    gint rows = e_table_model_row_count(ets->source);

    g_return_val_if_fail(row >= 0, -1);
    g_return_val_if_fail(row < rows, -1);

    if (ets_needs_sorting(es))
        ets_sort(ets);

    if (ets->sorted)
        return ets->sorted[row];
    else
        return row;
}

static void
ets_get_model_to_sorted_array (ESorter *es, gint **array, gint *count)
{
    ETableSorter *ets = E_TABLE_SORTER(es);
    if (array || count) {
        ets_backsort(ets);

        if (array)
            *array = ets->backsorted;
        if (count)
            *count = e_table_model_row_count(ets->source);
    }
}

static void
ets_get_sorted_to_model_array (ESorter *es, gint **array, gint *count)
{
    ETableSorter *ets = E_TABLE_SORTER(es);
    if (array || count) {
        ets_sort(ets);

        if (array)
            *array = ets->sorted;
        if (count)
            *count = e_table_model_row_count(ets->source);
    }
}

static gboolean
ets_needs_sorting(ESorter *es)
{
    ETableSorter *ets = E_TABLE_SORTER(es);
    if (ets->needs_sorting < 0) {
        if (e_table_sort_info_sorting_get_count(ets->sort_info) + e_table_sort_info_grouping_get_count(ets->sort_info))
            ets->needs_sorting = 1;
        else
            ets->needs_sorting = 0;
    }
    return ets->needs_sorting;
}