path: root/widgets/e-table/e-table-sorter.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * E-table-sorted.c: Implements a table that sorts another table
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org)
 *
 * (C) 1999 Helix Code, Inc.
 */
#include <config.h>
#include <stdlib.h>
#include <gtk/gtksignal.h>
#include <string.h>
#include "e-util/e-util.h"
#include "e-table-sorter.h"

#define PARENT_TYPE gtk_object_get_type()

#define INCREMENT_AMOUNT 100

static GtkObjectClass *parent_class;

static void ets_model_changed      (ETableModel *etm, ETableSorter *ets);
static void ets_model_row_changed  (ETableModel *etm, int row, ETableSorter *ets);
static void ets_model_cell_changed (ETableModel *etm, int col, int row, 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 void
ets_destroy (GtkObject *object)
{
    ETableSorter *ets = E_TABLE_SORTER (object);

    gtk_signal_disconnect (GTK_OBJECT (ets->source),
                   ets->table_model_changed_id);
    gtk_signal_disconnect (GTK_OBJECT (ets->source),
                   ets->table_model_row_changed_id);
    gtk_signal_disconnect (GTK_OBJECT (ets->source),
                   ets->table_model_cell_changed_id);
    gtk_signal_disconnect (GTK_OBJECT (ets->sort_info),
                   ets->sort_info_changed_id);

    ets->table_model_changed_id = 0;
    ets->table_model_row_changed_id = 0;
    ets->table_model_cell_changed_id = 0;
    ets->sort_info_changed_id = 0;
    
    if (ets->sort_info)
        gtk_object_unref(GTK_OBJECT(ets->sort_info));
    if (ets->full_header)
        gtk_object_unref(GTK_OBJECT(ets->full_header));
    if (ets->source)
        gtk_object_unref(GTK_OBJECT(ets->source));

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

static void
ets_class_init (ETableSorterClass *klass)
{
    GtkObjectClass *object_class = GTK_OBJECT_CLASS(klass);

    parent_class = gtk_type_class (PARENT_TYPE);

    object_class->destroy = ets_destroy;
}

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->sort_info_changed_id = 0;
}

E_MAKE_TYPE(e_table_sorter, "ETableSorter", ETableSorter, ets_class_init, ets_init, PARENT_TYPE);

ETableSorter *
e_table_sorter_new (ETableModel *source, ETableHeader *full_header, ETableSortInfo *sort_info)
{
    ETableSorter *ets = gtk_type_new (E_TABLE_SORTER_TYPE);
    
    ets->sort_info = sort_info;
    gtk_object_ref(GTK_OBJECT(ets->sort_info));
    ets->full_header = full_header;
    gtk_object_ref(GTK_OBJECT(ets->full_header));
    ets->source = source;
    gtk_object_ref(GTK_OBJECT(ets->source));

    ets->table_model_changed_id = gtk_signal_connect (GTK_OBJECT (source), "model_changed",
                               GTK_SIGNAL_FUNC (ets_model_changed), ets);
    ets->table_model_row_changed_id = gtk_signal_connect (GTK_OBJECT (source), "model_row_changed",
                                   GTK_SIGNAL_FUNC (ets_model_row_changed), ets);
    ets->table_model_cell_changed_id = gtk_signal_connect (GTK_OBJECT (source), "model_cell_changed",
                                GTK_SIGNAL_FUNC (ets_model_cell_changed), ets);
    ets->sort_info_changed_id = gtk_signal_connect (GTK_OBJECT (sort_info), "sort_info_changed",
                             GTK_SIGNAL_FUNC (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, int row, ETableSorter *ets)
{
    ets_clean(ets);
}

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

static void
ets_sort_info_changed (ETableSortInfo *info, ETableSorter *ets)
{
    ets_clean(ets);
}

static ETableSorter *ets_closure;
void **vals_closure;
int cols_closure;
int *ascending_closure;
GCompareFunc *compare_closure;

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

static int
qsort_callback(const void *data1, const void *data2)
{
    gint row1 = *(int *)data1;
    gint row2 = *(int *)data2;
    int j;
    int sort_count = e_table_sort_info_sorting_get_count(ets_closure->sort_info) + e_table_sort_info_grouping_get_count(ets_closure->sort_info);
    int comp_val = 0;
    int ascending = 1;
    for (j = 0; j < sort_count; j++) {
        comp_val = (*(compare_closure[j]))(vals_closure[cols_closure * row1 + j], vals_closure[cols_closure * row2 + j]);
        ascending = ascending_closure[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)
{
    int rows;
    int i;
    int j;
    int cols;
    int group_cols;

    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;

    cols_closure = cols;
    ets_closure = ets;

    vals_closure = g_new(void *, rows * cols);
    ascending_closure = g_new(int, cols);
    compare_closure = g_new(GCompareFunc, cols);

    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);

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

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

        compare_closure[j] = col->compare;
        ascending_closure[j] = column.ascending;
    }
    qsort(ets->sorted, rows, sizeof(int), qsort_callback);

    g_free(vals_closure);
    g_free(ascending_closure);
    g_free(compare_closure);
}

static void
ets_backsort(ETableSorter *ets)
{
    int 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;
    }
}

gboolean
e_table_sorter_needs_sorting(ETableSorter *ets)
{
    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;
}


gint
e_table_sorter_model_to_sorted (ETableSorter *sorter, int row)
{
    int rows = e_table_model_row_count(sorter->source);

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

    if (e_table_sorter_needs_sorting(sorter)) {
        ets_backsort(sorter);
        return sorter->backsorted[row];
    } else
        return row;
}

gint
e_table_sorter_sorted_to_model (ETableSorter *sorter, int row)
{
    int rows = e_table_model_row_count(sorter->source);

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

    if (e_table_sorter_needs_sorting(sorter)) {
        ets_sort(sorter);
        return sorter->sorted[row];
    } else
        return row;
}