path: root/widgets/table/e-table-selection-model.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 <string.h>

#include <gdk/gdkkeysyms.h>

#include <glib/gi18n.h>
#include "e-util/e-util.h"

#include "e-table-selection-model.h"

G_DEFINE_TYPE (ETableSelectionModel, e_table_selection_model, E_SELECTION_MODEL_ARRAY_TYPE)

static gint etsm_get_row_count (ESelectionModelArray *esm);

enum {
    PROP_0,
    PROP_MODEL,
    PROP_HEADER
};

static void
save_to_hash(gint model_row, gpointer closure)
{
    ETableSelectionModel *etsm = closure;
    const gchar *key = e_table_model_get_save_id(etsm->model, model_row);

    g_hash_table_insert(etsm->hash, (gpointer) key, (gpointer) key);
}

static void
free_hash(ETableSelectionModel *etsm)
{
    if (etsm->hash) {
        g_hash_table_destroy(etsm->hash);
        etsm->hash = NULL;
    }
    if (etsm->cursor_id)
        g_free(etsm->cursor_id);
    etsm->cursor_id = NULL;
}

static void
model_pre_change (ETableModel *etm, ETableSelectionModel *etsm)
{
    free_hash(etsm);

    if (etsm->model && e_table_model_has_save_id (etsm->model)) {
        gint cursor_row;

        etsm->hash = g_hash_table_new_full(
            g_str_hash, g_str_equal,
            (GDestroyNotify) g_free,
            (GDestroyNotify) NULL);
        e_selection_model_foreach(E_SELECTION_MODEL(etsm), save_to_hash, etsm);

        g_object_get(etsm,
                 "cursor_row", &cursor_row,
                 NULL);
        g_free (etsm->cursor_id);
        if (cursor_row != -1)
            etsm->cursor_id = e_table_model_get_save_id(etm, cursor_row);
        else
            etsm->cursor_id = NULL;
    }
}

static gint
model_changed_idle(ETableSelectionModel *etsm)
{
    ETableModel *etm = etsm->model;

    e_selection_model_clear(E_SELECTION_MODEL(etsm));

    if (etsm->cursor_id && etm && e_table_model_has_save_id(etm)) {
        gint row_count = e_table_model_row_count(etm);
        gint cursor_row = -1;
        gint cursor_col = -1;
        gint i;
        e_selection_model_array_confirm_row_count(E_SELECTION_MODEL_ARRAY(etsm));
        for (i = 0; i < row_count; i++) {
            gchar *save_id = e_table_model_get_save_id(etm, i);
            if (g_hash_table_lookup(etsm->hash, save_id))
                e_selection_model_change_one_row(E_SELECTION_MODEL(etsm), i, TRUE);

            if (etsm->cursor_id && !strcmp(etsm->cursor_id, save_id)) {
                cursor_row = i;
                cursor_col = e_selection_model_cursor_col(E_SELECTION_MODEL(etsm));
                if (cursor_col == -1) {
                    if (etsm->eth) {
                        cursor_col = e_table_header_prioritized_column (etsm->eth);
                    } else
                        cursor_col = 0;
                }
                e_selection_model_change_cursor(E_SELECTION_MODEL(etsm), cursor_row, cursor_col);
                g_free(etsm->cursor_id);
                etsm->cursor_id = NULL;
            }
            g_free(save_id);
        }
        free_hash(etsm);
        e_selection_model_cursor_changed (E_SELECTION_MODEL(etsm), cursor_row, cursor_col);
        e_selection_model_selection_changed (E_SELECTION_MODEL(etsm));
    }
    etsm->model_changed_idle_id = 0;
    return FALSE;
}

static void
model_changed(ETableModel *etm, ETableSelectionModel *etsm)
{
    e_selection_model_clear(E_SELECTION_MODEL(etsm));
    if (!etsm->model_changed_idle_id && etm && e_table_model_has_save_id(etm)) {
        etsm->model_changed_idle_id = g_idle_add_full(G_PRIORITY_HIGH, (GSourceFunc) model_changed_idle, etsm, NULL);
    }
}

static void
model_row_changed(ETableModel *etm, gint row, ETableSelectionModel *etsm)
{
    free_hash(etsm);
}

static void
model_cell_changed(ETableModel *etm, gint col, gint row, ETableSelectionModel *etsm)
{
    free_hash(etsm);
}

#if 1
static void
model_rows_inserted(ETableModel *etm, gint row, gint count, ETableSelectionModel *etsm)
{
    e_selection_model_array_insert_rows(E_SELECTION_MODEL_ARRAY(etsm), row, count);
    free_hash(etsm);
}

static void
model_rows_deleted(ETableModel *etm, gint row, gint count, ETableSelectionModel *etsm)
{
    e_selection_model_array_delete_rows(E_SELECTION_MODEL_ARRAY(etsm), row, count);
    free_hash(etsm);
}

#else

static void
model_rows_inserted(ETableModel *etm, gint row, gint count, ETableSelectionModel *etsm)
{
    model_changed(etm, etsm);
}

static void
model_rows_deleted(ETableModel *etm, gint row, gint count, ETableSelectionModel *etsm)
{
    model_changed(etm, etsm);
}
#endif

inline static void
add_model(ETableSelectionModel *etsm, ETableModel *model)
{
    etsm->model = model;
    if (model) {
        g_object_ref(model);
        etsm->model_pre_change_id = g_signal_connect(G_OBJECT(model), "model_pre_change",
                            G_CALLBACK(model_pre_change), etsm);
        etsm->model_changed_id = g_signal_connect(G_OBJECT(model), "model_changed",
                            G_CALLBACK(model_changed), etsm);
        etsm->model_row_changed_id = g_signal_connect(G_OBJECT(model), "model_row_changed",
                            G_CALLBACK(model_row_changed), etsm);
        etsm->model_cell_changed_id = g_signal_connect(G_OBJECT(model), "model_cell_changed",
                            G_CALLBACK(model_cell_changed), etsm);
        etsm->model_rows_inserted_id = g_signal_connect(G_OBJECT(model), "model_rows_inserted",
                            G_CALLBACK(model_rows_inserted), etsm);
        etsm->model_rows_deleted_id = g_signal_connect(G_OBJECT(model), "model_rows_deleted",
                            G_CALLBACK(model_rows_deleted), etsm);
    }
    e_selection_model_array_confirm_row_count(E_SELECTION_MODEL_ARRAY(etsm));
}

inline static void
drop_model(ETableSelectionModel *etsm)
{
    if (etsm->model) {
        g_signal_handler_disconnect(G_OBJECT(etsm->model),
                        etsm->model_pre_change_id);
        g_signal_handler_disconnect(G_OBJECT(etsm->model),
                        etsm->model_changed_id);
        g_signal_handler_disconnect(G_OBJECT(etsm->model),
                        etsm->model_row_changed_id);
        g_signal_handler_disconnect(G_OBJECT(etsm->model),
                        etsm->model_cell_changed_id);
        g_signal_handler_disconnect(G_OBJECT(etsm->model),
                        etsm->model_rows_inserted_id);
        g_signal_handler_disconnect(G_OBJECT(etsm->model),
                        etsm->model_rows_deleted_id);

        g_object_unref(etsm->model);
    }
    etsm->model = NULL;
}

static void
etsm_dispose (GObject *object)
{
    ETableSelectionModel *etsm;

    etsm = E_TABLE_SELECTION_MODEL (object);

    if (etsm->model_changed_idle_id)
        g_source_remove (etsm->model_changed_idle_id);
    etsm->model_changed_idle_id = 0;

    drop_model(etsm);
    free_hash(etsm);

    if (G_OBJECT_CLASS(e_table_selection_model_parent_class)->dispose)
        G_OBJECT_CLASS(e_table_selection_model_parent_class)->dispose (object);
}

static void
etsm_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    ETableSelectionModel *etsm = E_TABLE_SELECTION_MODEL (object);

    switch (prop_id) {
    case PROP_MODEL:
        g_value_set_object (value, etsm->model);
        break;
    case PROP_HEADER:
        g_value_set_object (value, etsm->eth);
        break;
    }
}

static void
etsm_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
    ETableSelectionModel *etsm = E_TABLE_SELECTION_MODEL (object);

    switch (prop_id) {
    case PROP_MODEL:
        drop_model(etsm);
        add_model(etsm, g_value_get_object (value) ? E_TABLE_MODEL(g_value_get_object (value)) : NULL);
        break;
    case PROP_HEADER:
        etsm->eth = E_TABLE_HEADER (g_value_get_object (value));
        break;
    }
}

static void
e_table_selection_model_init (ETableSelectionModel *selection)
{
    selection->model = NULL;
    selection->hash = NULL;
    selection->cursor_id = NULL;

    selection->model_changed_idle_id = 0;
}

static void
e_table_selection_model_class_init (ETableSelectionModelClass *klass)
{
    GObjectClass *object_class;
    ESelectionModelArrayClass *esma_class;

    object_class             = G_OBJECT_CLASS(klass);
    esma_class               = E_SELECTION_MODEL_ARRAY_CLASS(klass);

    object_class->dispose      = etsm_dispose;
    object_class->get_property = etsm_get_property;
    object_class->set_property = etsm_set_property;

    esma_class->get_row_count = etsm_get_row_count;

    g_object_class_install_property (object_class, PROP_MODEL,
                     g_param_spec_object ("model",
                                  _("Model"),
                                  /*_( */"XXX blurb" /*)*/,
                                  E_TABLE_MODEL_TYPE,
                                  G_PARAM_READWRITE));

    g_object_class_install_property (object_class, PROP_HEADER,
                     g_param_spec_object ("header",
                                  _("Header"),
                                  /*_( */"XXX blurb" /*)*/,
                                  E_TABLE_HEADER_TYPE,
                                  G_PARAM_READWRITE));
}

/**
 * e_table_selection_model_new
 *
 * This routine creates a new #ETableSelectionModel.
 *
 * Returns: The new #ETableSelectionModel.
 */
ETableSelectionModel *
e_table_selection_model_new (void)
{
    return g_object_new (E_TABLE_SELECTION_MODEL_TYPE, NULL);
}

static gint
etsm_get_row_count (ESelectionModelArray *esma)
{
    ETableSelectionModel *etsm = E_TABLE_SELECTION_MODEL(esma);

    if (etsm->model)
        return e_table_model_row_count (etsm->model);
    else
        return 0;
}