path: root/widgets/table/gal-a11y-e-cell.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)
 *
 */

#include <config.h>

#include <string.h>

#include <gtk/gtk.h>

#include "a11y/gal-a11y-util.h"
#include "table/e-table.h"
#include "table/e-tree.h"
#include <glib/gi18n.h>

#include "gal-a11y-e-cell.h"
#include "gal-a11y-e-cell-vbox.h"
#include "gal-a11y-e-table-item.h"

static GObjectClass *parent_class;
#define PARENT_TYPE (atk_object_get_type ())

#if 0
static void
unref_item (gpointer user_data, GObject *obj_loc)
{
    GalA11yECell *a11y = GAL_A11Y_E_CELL (user_data);
    a11y->item = NULL;
    g_object_unref (a11y);
}

static void
unref_cell (gpointer user_data, GObject *obj_loc)
{
    GalA11yECell *a11y = GAL_A11Y_E_CELL (user_data);
    a11y->cell_view = NULL;
    g_object_unref (a11y);
}
#endif

static gboolean
is_valid (AtkObject *cell)
{
    GalA11yECell *a11y = GAL_A11Y_E_CELL (cell);
    GalA11yETableItem *a11yItem = GAL_A11Y_E_TABLE_ITEM (a11y->parent);
    AtkStateSet *item_ss;
    gboolean ret = TRUE;

    item_ss = atk_object_ref_state_set (ATK_OBJECT (a11yItem));
    if (atk_state_set_contains_state (item_ss, ATK_STATE_DEFUNCT))
        ret = FALSE;

    g_object_unref (item_ss);

    if (ret && atk_state_set_contains_state (a11y->state_set, ATK_STATE_DEFUNCT))
        ret = FALSE;

    return ret;
}

static void
gal_a11y_e_cell_dispose (GObject *object)
{
    GalA11yECell *a11y = GAL_A11Y_E_CELL (object);

#if 0
    if (a11y->item)
        g_object_unref (G_OBJECT (a11y->item));  /*, unref_item, a11y); */
    if (a11y->cell_view)
        g_object_unref (G_OBJECT (a11y->cell_view)); /*, unref_cell, a11y); */
    if (a11y->parent)
        g_object_unref (a11y->parent);
#endif

    if (a11y->state_set) {
        g_object_unref (a11y->state_set);
        a11y->state_set = NULL;
    }

    if (parent_class->dispose)
        parent_class->dispose (object);

}

/* Static functions */
static G_CONST_RETURN gchar *
gal_a11y_e_cell_get_name (AtkObject * a11y)
{
    GalA11yECell *cell = GAL_A11Y_E_CELL (a11y);
        ETableCol *ecol;

    if (a11y->name != NULL && strcmp (a11y->name, ""))
        return a11y->name;

    if (cell->item != NULL) {
        ecol = e_table_header_get_column (cell->item->header, cell->view_col);
        if (ecol != NULL)
            return ecol->text;
    }

    return _("Table Cell");
}

static AtkStateSet *
gal_a11y_e_cell_ref_state_set (AtkObject *accessible)
{
    GalA11yECell *cell = GAL_A11Y_E_CELL (accessible);

    g_return_val_if_fail (cell->state_set, NULL);

    g_object_ref(cell->state_set);

    return cell->state_set;
}

static AtkObject*
gal_a11y_e_cell_get_parent (AtkObject *accessible)
{
    GalA11yECell *a11y = GAL_A11Y_E_CELL (accessible);
    return a11y->parent;
}

static gint
gal_a11y_e_cell_get_index_in_parent (AtkObject *accessible)
{
    GalA11yECell *a11y = GAL_A11Y_E_CELL (accessible);

    if (!is_valid (accessible))
        return -1;

    return (a11y->row + 1) * a11y->item->cols + a11y->view_col;
}

/* Component IFace */
static void
gal_a11y_e_cell_get_extents (AtkComponent *component,
        gint *x,
        gint *y,
        gint *width,
        gint *height,
        AtkCoordType coord_type)
{
    GalA11yECell *a11y = GAL_A11Y_E_CELL (component);
    GtkWidget *tableOrTree;
    gint row;
    gint col;
    gint xval;
    gint yval;

    row = a11y->row;
    col = a11y->view_col;

    tableOrTree = gtk_widget_get_parent (GTK_WIDGET (a11y->item->parent.canvas));
    if (E_IS_TREE (tableOrTree)) {
        e_tree_get_cell_geometry (E_TREE (tableOrTree),
                    row, col, &xval, &yval,
                    width, height);
    } else {
        e_table_get_cell_geometry (E_TABLE (tableOrTree),
                    row, col, &xval, &yval,
                    width, height);
    }

    atk_component_get_position (ATK_COMPONENT (a11y->parent),
                    x, y, coord_type);
    if (x && *x != G_MININT)
        *x += xval;
    if (y && *y != G_MININT)
        *y += yval;
}

static gboolean
gal_a11y_e_cell_grab_focus (AtkComponent *component)
{
    GalA11yECell *a11y;
    gint index;
    GtkWidget *toplevel;
    GalA11yETableItem *a11yTableItem;

    a11y = GAL_A11Y_E_CELL (component);

    /* for e_cell_vbox's children, we just grab the e_cell_vbox */
    if (GAL_A11Y_IS_E_CELL_VBOX (a11y->parent)) {
        return atk_component_grab_focus (ATK_COMPONENT (a11y->parent));
    }

    a11yTableItem = GAL_A11Y_E_TABLE_ITEM (a11y->parent);
    index = atk_object_get_index_in_parent (ATK_OBJECT (a11y));

    atk_selection_clear_selection (ATK_SELECTION (a11yTableItem));
    atk_selection_add_selection (ATK_SELECTION (a11yTableItem), index);

    gtk_widget_grab_focus (
        GTK_WIDGET (GNOME_CANVAS_ITEM (a11y->item)->canvas));
    toplevel = gtk_widget_get_toplevel (
        GTK_WIDGET (GNOME_CANVAS_ITEM (a11y->item)->canvas));
    if (toplevel && gtk_widget_is_toplevel (toplevel))
        gtk_window_present (GTK_WINDOW (toplevel));

    return TRUE;
}

/* Table IFace */

static void
gal_a11y_e_cell_atk_component_iface_init (AtkComponentIface *iface)
{
    iface->get_extents = gal_a11y_e_cell_get_extents;
    iface->grab_focus  = gal_a11y_e_cell_grab_focus;
}

static void
gal_a11y_e_cell_class_init (GalA11yECellClass *klass)
{
    AtkObjectClass *atk_object_class = ATK_OBJECT_CLASS (klass);
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    parent_class                          = g_type_class_ref (PARENT_TYPE);

    object_class->dispose                 = gal_a11y_e_cell_dispose;

    atk_object_class->get_parent          = gal_a11y_e_cell_get_parent;
    atk_object_class->get_index_in_parent = gal_a11y_e_cell_get_index_in_parent;
    atk_object_class->ref_state_set       = gal_a11y_e_cell_ref_state_set;
    atk_object_class->get_name            = gal_a11y_e_cell_get_name;
}

static void
gal_a11y_e_cell_init (GalA11yECell *a11y)
{
    a11y->item = NULL;
    a11y->cell_view = NULL;
    a11y->parent = NULL;
    a11y->model_col = -1;
    a11y->view_col = -1;
    a11y->row = -1;

    a11y->state_set = atk_state_set_new ();
    atk_state_set_add_state (a11y->state_set, ATK_STATE_TRANSIENT);
    atk_state_set_add_state (a11y->state_set, ATK_STATE_ENABLED);
    atk_state_set_add_state (a11y->state_set, ATK_STATE_SENSITIVE);
    atk_state_set_add_state (a11y->state_set, ATK_STATE_SELECTABLE);
    atk_state_set_add_state (a11y->state_set, ATK_STATE_SHOWING);
    atk_state_set_add_state (a11y->state_set, ATK_STATE_FOCUSABLE);
    atk_state_set_add_state (a11y->state_set, ATK_STATE_VISIBLE);
}

static ActionInfo *
_gal_a11y_e_cell_get_action_info (GalA11yECell *cell,
                            gint     index)
{
    GList *list_node;

    g_return_val_if_fail (GAL_A11Y_IS_E_CELL (cell), NULL);
    if (cell->action_list == NULL)
        return NULL;
    list_node = g_list_nth (cell->action_list, index);
    if (!list_node)
        return NULL;
    return (ActionInfo *) (list_node->data);
}

static void
_gal_a11y_e_cell_destroy_action_info (gpointer action_info,
                      gpointer user_data)
{
    ActionInfo *info = (ActionInfo *)action_info;

    g_return_if_fail (info != NULL);
    g_free (info->name);
    g_free (info->description);
    g_free (info->keybinding);
    g_free (info);
}

gboolean
gal_a11y_e_cell_add_action ( GalA11yECell * cell,
                 const gchar *action_name,
                 const gchar *action_description,
                 const gchar *action_keybinding,
                 ACTION_FUNC action_func)
{
    ActionInfo *info;
    g_return_val_if_fail (GAL_A11Y_IS_E_CELL (cell), FALSE);
    info = g_new (ActionInfo, 1);

    if (action_name != NULL)
        info->name = g_strdup (action_name);
    else
        info->name = NULL;

    if (action_description != NULL)
        info->description = g_strdup (action_description);
    else
        info->description = NULL;
    if (action_keybinding != NULL)
        info->keybinding = g_strdup (action_keybinding);
    else
        info->keybinding = NULL;
    info->do_action_func = action_func;

    cell->action_list = g_list_append (cell->action_list, (gpointer) info);
    return TRUE;
}

gboolean
gal_a11y_e_cell_remove_action (GalA11yECell *cell,
                   gint     action_index)
{
    GList *list_node;

    g_return_val_if_fail (GAL_A11Y_IS_E_CELL (cell), FALSE);
    list_node = g_list_nth (cell->action_list, action_index);
    if (!list_node)
        return FALSE;
    g_return_val_if_fail (list_node->data != NULL, FALSE);
    _gal_a11y_e_cell_destroy_action_info (list_node->data, NULL);
    cell->action_list = g_list_remove_link (cell->action_list, list_node);

    return TRUE;
}

gboolean
gal_a11y_e_cell_remove_action_by_name (GalA11yECell *cell,
                       const gchar *action_name)
{
    GList *list_node;
    gboolean action_found= FALSE;

    g_return_val_if_fail (GAL_A11Y_IS_E_CELL (cell), FALSE);
    for (list_node = cell->action_list; list_node && !action_found;
              list_node = list_node->next) {
        if (!g_ascii_strcasecmp (((ActionInfo *)(list_node->data))->name, action_name)) {
            action_found = TRUE;
            break;
        }
    }

    g_return_val_if_fail (action_found, FALSE);
    _gal_a11y_e_cell_destroy_action_info (list_node->data, NULL);
    cell->action_list = g_list_remove_link (cell->action_list, list_node);

    return TRUE;
}

static gint
gal_a11y_e_cell_action_get_n_actions (AtkAction *action)
{
    GalA11yECell *cell = GAL_A11Y_E_CELL(action);
    if (cell->action_list != NULL)
        return g_list_length (cell->action_list);
    else
        return 0;
}

static G_CONST_RETURN gchar *
gal_a11y_e_cell_action_get_name (AtkAction *action,
                           gint      index)
{
    GalA11yECell *cell = GAL_A11Y_E_CELL(action);
    ActionInfo *info = _gal_a11y_e_cell_get_action_info (cell, index);

    if (info == NULL)
        return NULL;
    return info->name;
}

static G_CONST_RETURN gchar *
gal_a11y_e_cell_action_get_description (AtkAction *action,
                    gint      index)
{
    GalA11yECell *cell = GAL_A11Y_E_CELL(action);
    ActionInfo *info = _gal_a11y_e_cell_get_action_info (cell, index);

    if (info == NULL)
        return NULL;
    return info->description;
}

static gboolean
gal_a11y_e_cell_action_set_description (AtkAction   *action,
                    gint        index,
                    const gchar *desc)
{
    GalA11yECell *cell = GAL_A11Y_E_CELL(action);
    ActionInfo *info = _gal_a11y_e_cell_get_action_info (cell, index);

    if (info == NULL)
        return FALSE;
    g_free (info->description);
    info->description = g_strdup (desc);
    return TRUE;
}

static G_CONST_RETURN gchar *
gal_a11y_e_cell_action_get_keybinding (AtkAction *action,
                       gint      index)
{
    GalA11yECell *cell = GAL_A11Y_E_CELL(action);
    ActionInfo *info = _gal_a11y_e_cell_get_action_info (cell, index);
    if (info == NULL)
        return NULL;

    return info->keybinding;
}

static gboolean
idle_do_action (gpointer data)
{
    GalA11yECell *cell;

    cell = GAL_A11Y_E_CELL (data);

    if (!is_valid (ATK_OBJECT (cell)))
        return FALSE;

    cell->action_idle_handler = 0;
    cell->action_func (cell);
    g_object_unref (cell);

    return FALSE;
}

static gboolean
gal_a11y_e_cell_action_do_action (AtkAction *action,
                  gint      index)
{
    GalA11yECell *cell = GAL_A11Y_E_CELL(action);
    ActionInfo *info = _gal_a11y_e_cell_get_action_info (cell, index);

    if (!is_valid (ATK_OBJECT (action)))
        return FALSE;

    if (info == NULL)
        return FALSE;
    g_return_val_if_fail (info->do_action_func, FALSE);
    if (cell->action_idle_handler)
        return FALSE;
    cell->action_func = info->do_action_func;
    g_object_ref (cell);
    cell->action_idle_handler = g_idle_add (idle_do_action, cell);

    return TRUE;
}

static void
gal_a11y_e_cell_atk_action_interface_init (AtkActionIface *iface)
{
  g_return_if_fail (iface != NULL);

  iface->get_n_actions = gal_a11y_e_cell_action_get_n_actions;
  iface->do_action = gal_a11y_e_cell_action_do_action;
  iface->get_name = gal_a11y_e_cell_action_get_name;
  iface->get_description = gal_a11y_e_cell_action_get_description;
  iface->set_description = gal_a11y_e_cell_action_set_description;
  iface->get_keybinding = gal_a11y_e_cell_action_get_keybinding;
}

void
gal_a11y_e_cell_type_add_action_interface (GType type)
{
    static const GInterfaceInfo atk_action_info =
    {
    (GInterfaceInitFunc) gal_a11y_e_cell_atk_action_interface_init,
    (GInterfaceFinalizeFunc) NULL,
    NULL
    };

    g_type_add_interface_static (type, ATK_TYPE_ACTION,
                     &atk_action_info);
}

gboolean
gal_a11y_e_cell_add_state (GalA11yECell     *cell,
               AtkStateType state_type,
               gboolean     emit_signal)
{
    if (!atk_state_set_contains_state (cell->state_set, state_type)) {
        gboolean rc;

        rc = atk_state_set_add_state (cell->state_set, state_type);
        /*
         * The signal should only be generated if the value changed,
         * not when the cell is set up.  So states that are set
         * initially should pass FALSE as the emit_signal argument.
         */

        if (emit_signal) {
            atk_object_notify_state_change (ATK_OBJECT (cell), state_type, TRUE);
            /* If state_type is ATK_STATE_VISIBLE, additional
               notification */
            if (state_type == ATK_STATE_VISIBLE)
                g_signal_emit_by_name (cell, "visible_data_changed");
        }

        return rc;
    }
    else
        return FALSE;
}

gboolean
gal_a11y_e_cell_remove_state (GalA11yECell     *cell,
                  AtkStateType state_type,
                  gboolean     emit_signal)
{
    if (atk_state_set_contains_state (cell->state_set, state_type)) {
        gboolean rc;

        rc = atk_state_set_remove_state (cell->state_set, state_type);
        /*
         * The signal should only be generated if the value changed,
         * not when the cell is set up.  So states that are set
         * initially should pass FALSE as the emit_signal argument.
         */

        if (emit_signal) {
            atk_object_notify_state_change (ATK_OBJECT (cell), state_type, FALSE);
            /* If state_type is ATK_STATE_VISIBLE, additional notification */
            if (state_type == ATK_STATE_VISIBLE)
                g_signal_emit_by_name (cell, "visible_data_changed");
        }

        return rc;
    }
    else
        return FALSE;
}

/**
 * gal_a11y_e_cell_get_type:
 * @void:
 *
 * Registers the &GalA11yECell class if necessary, and returns the type ID
 * associated to it.
 *
 * Return value: The type ID of the &GalA11yECell class.
 **/
GType
gal_a11y_e_cell_get_type (void)
{
    static GType type = 0;

    if (!type) {
        GTypeInfo info = {
            sizeof (GalA11yECellClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) gal_a11y_e_cell_class_init,
            (GClassFinalizeFunc) NULL,
            NULL, /* class_data */
            sizeof (GalA11yECell),
            0,
            (GInstanceInitFunc) gal_a11y_e_cell_init,
            NULL /* value_cell */
        };

        static const GInterfaceInfo atk_component_info = {
            (GInterfaceInitFunc) gal_a11y_e_cell_atk_component_iface_init,
            (GInterfaceFinalizeFunc) NULL,
            NULL
        };

        type = g_type_register_static (PARENT_TYPE, "GalA11yECell", &info, 0);
        g_type_add_interface_static (type, ATK_TYPE_COMPONENT, &atk_component_info);
    }

    return type;
}

AtkObject *
gal_a11y_e_cell_new (ETableItem *item,
             ECellView  *cell_view,
             AtkObject  *parent,
             gint         model_col,
             gint         view_col,
             gint         row)
{
    AtkObject *a11y;

    a11y = g_object_new (gal_a11y_e_cell_get_type (), NULL);

    gal_a11y_e_cell_construct (a11y,
                   item,
                   cell_view,
                   parent,
                   model_col,
                   view_col,
                   row);
    return a11y;
}

void
gal_a11y_e_cell_construct (AtkObject  *object,
               ETableItem *item,
               ECellView  *cell_view,
               AtkObject  *parent,
               gint         model_col,
               gint         view_col,
               gint         row)
{
    GalA11yECell *a11y = GAL_A11Y_E_CELL (object);
    a11y->item      = item;
    a11y->cell_view = cell_view;
    a11y->parent    = parent;
    a11y->model_col = model_col;
    a11y->view_col  = view_col;
    a11y->row       = row;
    ATK_OBJECT (a11y) ->role    = ATK_ROLE_TABLE_CELL;

    if (item)
        g_object_ref (G_OBJECT (item));

#if 0
    if (parent)
        g_object_ref (parent);

    if (cell_view)
        g_object_ref (G_OBJECT (cell_view));

#endif
}