path: root/widgets/table/gal-a11y-e-table.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:
 *      Christopher James Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "a11y/gal-a11y-util.h"
#include "table/e-table.h"
#include "table/e-table-click-to-add.h"
#include "table/e-table-group.h"
#include "table/e-table-group-container.h"
#include "table/e-table-group-leaf.h"

#include "gal-a11y-e-table.h"
#include "gal-a11y-e-table-factory.h"
#include "gal-a11y-e-table-item.h"

#define CS_CLASS(a11y) (G_TYPE_INSTANCE_GET_CLASS ((a11y), C_TYPE_STREAM, GalA11yETableClass))
static AtkObjectClass *parent_class;
static GType parent_type;
static gint priv_offset;
#define GET_PRIVATE(object) ((GalA11yETablePrivate *) (((gchar *) object) + priv_offset))
#define PARENT_TYPE (parent_type)

struct _GalA11yETablePrivate {
    AtkObject *child_item;
};

/* Static functions */
static ETableItem *
find_first_table_item (ETableGroup *group)
{
    GnomeCanvasGroup *cgroup;
    GList *l;

    cgroup = GNOME_CANVAS_GROUP (group);

    for (l = cgroup->item_list; l; l = l->next) {
        GnomeCanvasItem *i;

        i = GNOME_CANVAS_ITEM (l->data);

        if (E_IS_TABLE_GROUP (i))
            return find_first_table_item (E_TABLE_GROUP (i));
        else if (E_IS_TABLE_ITEM (i)) {
            return E_TABLE_ITEM (i);
        }
    }

    return NULL;
}

static AtkObject*
eti_get_accessible (ETableItem *eti, AtkObject *parent)
{
    AtkObject *a11y = NULL;

    g_return_val_if_fail (eti, NULL);

    a11y = atk_gobject_accessible_for_object (G_OBJECT (eti));
    g_return_val_if_fail (a11y, NULL);

    return a11y;
}

static gboolean
init_child_item (GalA11yETable *a11y)
{
    ETable *table;

    if (!a11y || !GTK_IS_ACCESSIBLE (a11y))
        return FALSE;

    table = E_TABLE (gtk_accessible_get_widget (GTK_ACCESSIBLE (a11y)));
    if (table && gtk_widget_get_mapped (GTK_WIDGET (table)) && table->group && E_IS_TABLE_GROUP_CONTAINER (table->group)) {
        ETableGroupContainer *etgc =  (ETableGroupContainer *) table->group;
        GList *list;

        for (list = etgc->children; list; list = g_list_next (list)) {
            ETableGroupContainerChildNode *child_node = list->data;
            ETableGroup *child = child_node->child;
            ETableItem *eti = find_first_table_item (child);

            eti_get_accessible (eti, ATK_OBJECT (a11y));
        }
    }
    g_object_unref (a11y);
    g_object_unref (table);

    return FALSE;
}

static AtkObject*
et_ref_accessible_at_point  (AtkComponent *component,
                 gint x,
                 gint y,
                 AtkCoordType coord_type)
{
    GalA11yETable *a11y = GAL_A11Y_E_TABLE (component);
    if (GET_PRIVATE (a11y)->child_item)
        g_object_ref (GET_PRIVATE (a11y)->child_item);
    return GET_PRIVATE (a11y)->child_item;
}

static gint
et_get_n_children (AtkObject *accessible)
{
    GalA11yETable *a11y = GAL_A11Y_E_TABLE (accessible);
    ETable * et;
    gint n = 0;

    et = E_TABLE (gtk_accessible_get_widget (GTK_ACCESSIBLE (a11y)));

    if (et && et->group) {
        if (E_IS_TABLE_GROUP_LEAF (et->group))
            n = 1;
        else if (E_IS_TABLE_GROUP_CONTAINER (et->group)) {
            ETableGroupContainer *etgc = (ETableGroupContainer *) et->group;
            n = g_list_length (etgc->children);
        }
    }

    if (et && et->use_click_to_add && et->click_to_add) {
        n++;
    }
    return n;
}

static AtkObject*
et_ref_child (AtkObject *accessible,
          gint i)
{
    GalA11yETable *a11y = GAL_A11Y_E_TABLE (accessible);
    ETable * et;
    gint child_no;

    et = E_TABLE (gtk_accessible_get_widget (GTK_ACCESSIBLE (a11y)));
    if (!et)
        return NULL;

    child_no = et_get_n_children (accessible);
    if (i == 0 || i < child_no - 1) {
        if (E_IS_TABLE_GROUP_LEAF (et->group)) {
            ETableItem *eti = find_first_table_item (et->group);
            AtkObject *aeti = eti_get_accessible (eti, accessible);
            if (aeti)
                g_object_ref (aeti);
            return aeti;

        } else if (E_IS_TABLE_GROUP_CONTAINER (et->group)) {
            ETableGroupContainer *etgc =  (ETableGroupContainer *) et->group;
            ETableGroupContainerChildNode *child_node = g_list_nth_data (etgc->children, i);
            if (child_node) {
                ETableGroup *child = child_node->child;
                ETableItem * eti = find_first_table_item (child);
                AtkObject *aeti =  eti_get_accessible (eti, accessible);
                if (aeti)
                    g_object_ref (aeti);
                return aeti;
            }
        }
    } else if (i == child_no -1) {
        ETableClickToAdd * etcta;

        if (et && et->use_click_to_add && et->click_to_add) {
            etcta = E_TABLE_CLICK_TO_ADD (et->click_to_add);
            accessible = atk_gobject_accessible_for_object (G_OBJECT (etcta));
            if (accessible)
                g_object_ref (accessible);
            return accessible;
        }
    }

    return NULL;
}

static AtkLayer
et_get_layer (AtkComponent *component)
{
    return ATK_LAYER_WIDGET;
}

static void
et_class_init (GalA11yETableClass *class)
{
    AtkObjectClass *atk_object_class = ATK_OBJECT_CLASS (class);

    parent_class                              = g_type_class_ref (PARENT_TYPE);

    atk_object_class->get_n_children          = et_get_n_children;
    atk_object_class->ref_child               = et_ref_child;
}

static void
et_atk_component_iface_init (AtkComponentIface *iface)
{
    iface->ref_accessible_at_point = et_ref_accessible_at_point;
    iface->get_layer = et_get_layer;
}

static void
et_init (GalA11yETable *a11y)
{
    GalA11yETablePrivate *priv;

    priv = GET_PRIVATE (a11y);

    priv->child_item = NULL;
}

/**
 * gal_a11y_e_table_get_type:
 * @void:
 *
 * Registers the &GalA11yETable class if necessary, and returns the type ID
 * associated to it.
 *
 * Return value: The type ID of the &GalA11yETable class.
 **/
GType
gal_a11y_e_table_get_type (void)
{
    static GType type = 0;

    if (!type) {
        AtkObjectFactory *factory;

        GTypeInfo info = {
            sizeof (GalA11yETableClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) et_class_init,
            (GClassFinalizeFunc) NULL,
            NULL, /* class_data */
            sizeof (GalA11yETable),
            0,
            (GInstanceInitFunc) et_init,
            NULL /* value_table */
        };

        static const GInterfaceInfo atk_component_info = {
            (GInterfaceInitFunc) et_atk_component_iface_init,
            (GInterfaceFinalizeFunc) NULL,
            NULL
        };

        factory = atk_registry_get_factory (atk_get_default_registry (), GTK_TYPE_WIDGET);
        parent_type = atk_object_factory_get_accessible_type (factory);

        type = gal_a11y_type_register_static_with_private (PARENT_TYPE, "GalA11yETable", &info, 0,
                                   sizeof (GalA11yETablePrivate), &priv_offset);
        g_type_add_interface_static (type, ATK_TYPE_COMPONENT, &atk_component_info);
    }

    return type;
}

AtkObject *
gal_a11y_e_table_new (GObject *widget)
{
    GalA11yETable *a11y;
    ETable *table;

    table = E_TABLE (widget);

    a11y = g_object_new (gal_a11y_e_table_get_type (), NULL);

    gtk_accessible_set_widget (GTK_ACCESSIBLE (a11y), GTK_WIDGET (widget));

    /* we need to init all the children for multiple table items */
    if (table && gtk_widget_get_mapped (GTK_WIDGET (table)) && table->group && E_IS_TABLE_GROUP_CONTAINER (table->group)) {
        /* Ref it here so that it is still valid in the idle function */
        /* It will be unrefed in the idle function */
        g_object_ref (a11y);
        g_object_ref (widget);

        g_idle_add ((GSourceFunc) init_child_item, a11y);
    }

    return ATK_OBJECT (a11y);
}

void
gal_a11y_e_table_init (void)
{
    if (atk_get_root ())
        atk_registry_set_factory_type (atk_get_default_registry (),
                        E_TYPE_TABLE,
                        gal_a11y_e_table_factory_get_type ());

}