path: root/lib/widgets/ephy-node-view.c

/* 
 *  Copyright (C) 2002 Jorn Baayen <jorn@nl.linux.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#include <gtk/gtktreeselection.h>
#include <gtk/gtktreeviewcolumn.h>
#include <gtk/gtkcellrenderertext.h>
#include <gtk/gtkcellrendererpixbuf.h>
#include <gtk/gtkwindow.h>
#include <gdk/gdkkeysyms.h>

#include "eggtreemodelfilter.h"
#include "ephy-node-view.h"
#include "ephy-tree-model-sort.h"
#include "eggtreemultidnd.h"
#include "ephy-dnd.h"
#include "ephy-marshal.h"
#include "string.h"

static void ephy_node_view_class_init (EphyNodeViewClass *klass);
static void ephy_node_view_init (EphyNodeView *view);
static void ephy_node_view_finalize (GObject *object);
static void ephy_node_view_set_property (GObject *object,
                         guint prop_id,
                         const GValue *value,
                         GParamSpec *pspec);
static void ephy_node_view_get_property (GObject *object,
                         guint prop_id,
                         GValue *value,
                         GParamSpec *pspec);

struct EphyNodeViewPrivate
{
    EphyNode *root;

    EphyTreeModelNode *nodemodel;
    GtkTreeModel *filtermodel;
    GtkTreeModel *sortmodel;
    GtkCellRenderer *editable_renderer;
    GtkTreeViewColumn *editable_column;
    EphyTreeModelNodeColumn editable_node_column;

    EphyNodeFilter *filter;

    EphyNode *selected_node;

    GtkTargetList *drag_targets;

    int default_sort_column_id;
    int priority_prop_id;

    gboolean editing;
    int editable_property;
};

enum
{
    NODE_ACTIVATED,
    NODE_SELECTED,
    NODE_DROPPED,
    SHOW_POPUP,
    LAST_SIGNAL
};

enum
{
    PROP_0,
    PROP_ROOT,
    PROP_FILTER
};

static EphyNodeView *target_view;

static GObjectClass *parent_class = NULL;

static guint ephy_node_view_signals[LAST_SIGNAL] = { 0 };

GType
ephy_node_view_get_type (void)
{
    static GType ephy_node_view_type = 0;

    if (ephy_node_view_type == 0)
    {
        static const GTypeInfo our_info =
        {
            sizeof (EphyNodeViewClass),
            NULL,
            NULL,
            (GClassInitFunc) ephy_node_view_class_init,
            NULL,
            NULL,
            sizeof (EphyNodeView),
            0,
            (GInstanceInitFunc) ephy_node_view_init
        };

        ephy_node_view_type = g_type_register_static (GTK_TYPE_TREE_VIEW,
                                  "EphyNodeView",
                                  &our_info, 0);
    }

    return ephy_node_view_type;
}

static void
ephy_node_view_class_init (EphyNodeViewClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    parent_class = g_type_class_peek_parent (klass);

    object_class->finalize = ephy_node_view_finalize;

    object_class->set_property = ephy_node_view_set_property;
    object_class->get_property = ephy_node_view_get_property;

    g_object_class_install_property (object_class,
                     PROP_ROOT,
                     g_param_spec_pointer ("root",
                                   "Root node",
                                   "Root node",
                                   G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
    g_object_class_install_property (object_class,
                     PROP_FILTER,
                     g_param_spec_object ("filter",
                                  "Filter object",
                                  "Filter object",
                                  EPHY_TYPE_NODE_FILTER,
                                  G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));

    ephy_node_view_signals[NODE_ACTIVATED] =
        g_signal_new ("node_activated",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EphyNodeViewClass, node_activated),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__POINTER,
                  G_TYPE_NONE,
                  1,
                  G_TYPE_POINTER);
    ephy_node_view_signals[NODE_SELECTED] =
        g_signal_new ("node_selected",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EphyNodeViewClass, node_selected),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__POINTER,
                  G_TYPE_NONE,
                  1,
                  G_TYPE_POINTER);
    ephy_node_view_signals[NODE_DROPPED] =
        g_signal_new ("node_dropped",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EphyNodeViewClass, node_dropped),
                  NULL, NULL,
                  ephy_marshal_VOID__POINTER_POINTER,
                  G_TYPE_NONE,
                  2,
                  G_TYPE_POINTER,
                  G_TYPE_POINTER);
    ephy_node_view_signals[SHOW_POPUP] =
        g_signal_new ("show_popup",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EphyNodeViewClass, show_popup),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE,
                  0);
}

static void
ephy_node_view_finalize (GObject *object)
{
    EphyNodeView *view;

    g_return_if_fail (object != NULL);
    g_return_if_fail (EPHY_IS_NODE_VIEW (object));

    view = EPHY_NODE_VIEW (object);

    g_return_if_fail (view->priv != NULL);

    g_object_unref (G_OBJECT (view->priv->sortmodel));
    g_object_unref (G_OBJECT (view->priv->filtermodel));
    g_object_unref (G_OBJECT (view->priv->nodemodel));

    g_free (view->priv);

    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static EphyNode *
get_node_from_path (EphyNodeView *view, GtkTreePath *path)
{
    EphyNode *node;
    GtkTreeIter iter, iter2;

    gtk_tree_model_get_iter (view->priv->sortmodel, &iter, path);
    gtk_tree_model_sort_convert_iter_to_child_iter
        (GTK_TREE_MODEL_SORT (view->priv->sortmodel), &iter2, &iter);
    egg_tree_model_filter_convert_iter_to_child_iter
        (EGG_TREE_MODEL_FILTER (view->priv->filtermodel), &iter, &iter2);
    node = ephy_tree_model_node_node_from_iter (view->priv->nodemodel, &iter);

    return node;
}

static gboolean
drag_motion_cb (GtkWidget *widget,
                GdkDragContext *context,
                gint x,
                gint y,
                guint time,
            EphyNodeView *view)
{
    EphyNode *node;
    GtkTreePath *path = NULL;
    GtkTreeViewDropPosition pos;
    gboolean res;
    EphyNodeViewPriority priority;

    g_signal_stop_emission_by_name (widget, "drag_motion");

    res = gtk_tree_view_get_dest_row_at_pos (GTK_TREE_VIEW (widget),
                             x, y, &path, &pos);
    if (!res) return TRUE;

    node = get_node_from_path (view, path);

    priority = ephy_node_get_property_int (node, view->priv->priority_prop_id);

    if (priority != EPHY_NODE_VIEW_ALL_PRIORITY &&
        priority != EPHY_NODE_VIEW_SPECIAL_PRIORITY)

    {
        gtk_tree_view_set_drag_dest_row (GTK_TREE_VIEW (widget), path,
                         GTK_TREE_VIEW_DROP_INTO_OR_AFTER);
        gdk_drag_status (context, context->suggested_action, time);
    }
    else
    {
        gdk_drag_status (context, 0, time);
    }

    return TRUE;
}

static gboolean
drag_drop_cb (GtkWidget *widget,
              GdkDragContext *context,
              gint x,
              gint y,
              guint time,
          EphyNodeView *view)
{
    GdkAtom target;

    g_signal_stop_emission_by_name (widget, "drag_drop");

    target = gtk_drag_dest_find_target (widget, context,
                        view->priv->drag_targets);

    if (target != GDK_NONE)
    {
        gtk_drag_get_data (widget, context, target, time);
    }

    return TRUE;
}

static gboolean
drag_data_received_cb (GtkWidget *widget,
                       GdkDragContext *context,
                       gint x,
                       gint y,
                   GtkSelectionData *selection_data,
                       guint info,
                       guint time,
                   EphyNodeView *view)
{
    GtkTreePath *path = NULL;
    GtkTreeViewDropPosition pos;

    g_signal_stop_emission_by_name (widget, "drag_data_received");

    if (gtk_tree_view_get_dest_row_at_pos (GTK_TREE_VIEW (widget),
                           x, y, &path, &pos))
    {
        EphyNode *node;
        GList *src_nodes;

        node = get_node_from_path (view, path);

        src_nodes = ephy_dnd_node_list_extract_nodes
                (selection_data->data);

        g_signal_emit (G_OBJECT (view),
                   ephy_node_view_signals[NODE_DROPPED], 0,
                   node, src_nodes);

        g_list_free (src_nodes);

    }

    return TRUE;
}

void
ephy_node_view_enable_drag_dest (EphyNodeView *view,
                 GtkTargetEntry *types,
                 int n_types)
{
    GtkWidget *treeview;

    g_return_if_fail (view != NULL);

    treeview = GTK_WIDGET (view);

    gtk_tree_view_enable_model_drag_dest (GTK_TREE_VIEW (treeview),
                          types, n_types,
                          GDK_ACTION_COPY);
    view->priv->drag_targets = gtk_target_list_new (types, n_types);

    g_signal_connect (treeview, "drag_data_received",
              G_CALLBACK (drag_data_received_cb), view);
    g_signal_connect (treeview, "drag_drop",
              G_CALLBACK (drag_drop_cb), view);
    g_signal_connect (treeview, "drag_motion",
              G_CALLBACK (drag_motion_cb), view);
}

static void
filter_changed_cb (EphyNodeFilter *filter,
           EphyNodeView *view)
{
    GtkWidget *window;

    g_return_if_fail (EPHY_IS_NODE_VIEW (view));

    window = gtk_widget_get_toplevel (GTK_WIDGET (view));

    if (window != NULL && window->window != NULL)
    {
        /* nice busy cursor */
        GdkCursor *cursor;

        cursor = gdk_cursor_new (GDK_WATCH);
        gdk_window_set_cursor (window->window, cursor);
        gdk_cursor_unref (cursor);

        gdk_flush ();

        gdk_window_set_cursor (window->window, NULL);

        /* no flush: this will cause the cursor to be reset
         * only when the UI is free again */
    }
}

static void
ephy_node_view_selection_changed_cb (GtkTreeSelection *selection,
                         EphyNodeView *view)
{
    GList *list;
    EphyNode *node = NULL;

    view->priv->selected_node = NULL;

    list = ephy_node_view_get_selection (view);
    if (list)
    {
        node = list->data;
    }
    g_list_free (list);

    g_signal_emit (G_OBJECT (view), ephy_node_view_signals[NODE_SELECTED], 0, node);
}

static void
ephy_node_view_row_activated_cb (GtkTreeView *treeview,
                     GtkTreePath *path,
                     GtkTreeViewColumn *column,
                     EphyNodeView *view)
{
    GtkTreeIter iter, iter2;
    EphyNode *node;

    gtk_tree_model_get_iter (view->priv->sortmodel, &iter, path);
    gtk_tree_model_sort_convert_iter_to_child_iter
        (GTK_TREE_MODEL_SORT (view->priv->sortmodel), &iter2, &iter);
    egg_tree_model_filter_convert_iter_to_child_iter
        (EGG_TREE_MODEL_FILTER (view->priv->filtermodel), &iter, &iter2);

    node = ephy_tree_model_node_node_from_iter (view->priv->nodemodel, &iter);

    g_signal_emit (G_OBJECT (view), ephy_node_view_signals[NODE_ACTIVATED], 0, node);
}

static gboolean
ephy_node_view_key_press_cb (GtkTreeView *treeview,
                 GdkEventKey *event,
                 EphyNodeView *view)
{
    if ((event->state & GDK_SHIFT_MASK) &&
        (event->keyval == GDK_F10))
    {
        g_signal_emit (G_OBJECT (view), ephy_node_view_signals[SHOW_POPUP], 0);

        return TRUE;
    }

    return FALSE;
}

static gboolean
ephy_node_view_button_press_cb (GtkTreeView *treeview,
                    GdkEventButton *event,
                    EphyNodeView *view)
{
    GtkTreePath *path;
    GtkTreeSelection *selection;
    gboolean result = FALSE;

    if (event->button == 3)
    {
        if (gtk_tree_view_get_path_at_pos (GTK_TREE_VIEW (treeview),
                           event->x,
                           event->y,
                           &path,
                           NULL, NULL, NULL))
        {
            selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (treeview));
            if (gtk_tree_selection_path_is_selected (selection, path))
            {
                /* We handle the event (so the view won't be
                 * changed by the user click) because the user
                 * clicked on an already selected element */
                result = TRUE;
            }
            else
            {
                view->priv->selected_node =
                    get_node_from_path (view, path);
            }

            target_view = view;
            g_signal_emit (G_OBJECT (view), ephy_node_view_signals[SHOW_POPUP], 0);
            target_view = NULL;
        }
    }

    return result;
}

static void
ephy_node_view_set_property (GObject *object,
                 guint prop_id,
                 const GValue *value,
                 GParamSpec *pspec)
{
    EphyNodeView *view = EPHY_NODE_VIEW (object);

    switch (prop_id)
    {
    case PROP_ROOT:
        view->priv->root = g_value_get_pointer (value);
        break;
    case PROP_FILTER:
        view->priv->filter = g_value_get_object (value);

        if (view->priv->filter != NULL)
        {
            g_signal_connect_object (G_OBJECT (view->priv->filter),
                             "changed",
                             G_CALLBACK (filter_changed_cb),
                             G_OBJECT (view),
                         0);
        }
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
        break;
    }
}

static void
ephy_node_view_get_property (GObject *object,
                 guint prop_id,
                 GValue *value,
                 GParamSpec *pspec)
{
    EphyNodeView *view = EPHY_NODE_VIEW (object);

    switch (prop_id)
    {
    case PROP_ROOT:
        g_value_set_pointer (value, view->priv->root);
        break;
    case PROP_FILTER:
        g_value_set_object (value, view->priv->filter);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
        break;
    }
}

static void
node_from_sort_iter_cb (EphyTreeModelSort *model,
                GtkTreeIter *iter,
                void **node,
                EphyNodeView *view)
{
    GtkTreeIter filter_iter, node_iter;

    gtk_tree_model_sort_convert_iter_to_child_iter (GTK_TREE_MODEL_SORT (model),
                            &filter_iter, iter);
    egg_tree_model_filter_convert_iter_to_child_iter (EGG_TREE_MODEL_FILTER (view->priv->filtermodel),
                              &node_iter, &filter_iter);
    *node = ephy_tree_model_node_node_from_iter
        (EPHY_TREE_MODEL_NODE (view->priv->nodemodel), &node_iter);
}

static void
ephy_node_view_construct (EphyNodeView *view)
{
    GtkTreeSelection *selection;

    view->priv->nodemodel = ephy_tree_model_node_new (view->priv->root,
                              view->priv->filter);
    view->priv->filtermodel = egg_tree_model_filter_new (GTK_TREE_MODEL (view->priv->nodemodel),
                                 NULL);
    egg_tree_model_filter_set_visible_column (EGG_TREE_MODEL_FILTER (view->priv->filtermodel),
                          EPHY_TREE_MODEL_NODE_COL_VISIBLE);
    view->priv->sortmodel = ephy_tree_model_sort_new (view->priv->filtermodel);
    g_signal_connect_object (G_OBJECT (view->priv->sortmodel),
                 "node_from_iter",
                 G_CALLBACK (node_from_sort_iter_cb),
                 view,
                 0);
    gtk_tree_view_set_model (GTK_TREE_VIEW (view), GTK_TREE_MODEL (view->priv->sortmodel));
    g_signal_connect_object (G_OBJECT (view),
                     "button_press_event",
                     G_CALLBACK (ephy_node_view_button_press_cb),
                     view,
                 0);
    g_signal_connect_object (G_OBJECT (view),
                     "key_press_event",
                     G_CALLBACK (ephy_node_view_key_press_cb),
                     view,
                 0);
    g_signal_connect_object (G_OBJECT (view),
                     "row_activated",
                     G_CALLBACK (ephy_node_view_row_activated_cb),
                     view,
                 0);

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (view));
    gtk_tree_selection_set_mode (selection, GTK_SELECTION_MULTIPLE);
    g_signal_connect_object (G_OBJECT (selection),
                     "changed",
                     G_CALLBACK (ephy_node_view_selection_changed_cb),
                     view,
                 0);
}

GtkWidget *
ephy_node_view_new (EphyNode *root,
            EphyNodeFilter *filter)
{
    EphyNodeView *view;

    view = EPHY_NODE_VIEW (g_object_new (EPHY_TYPE_NODE_VIEW,
                         "filter", filter,
                         "root", root,
                         NULL));

    ephy_node_view_construct (view);

    g_return_val_if_fail (view->priv != NULL, NULL);

    return GTK_WIDGET (view);
}

static void
cell_renderer_edited (GtkCellRendererText *cell,
                      const char *path_str,
                      const char *new_text,
                      EphyNodeView *view)
{
    GValue value = { 0, };
    GtkTreePath *path;
    GtkTreeIter iter, iter2;
    EphyNode *node;

    view->priv->editing = FALSE;

    g_object_set (G_OBJECT (view->priv->editable_renderer),
                      "editable", FALSE,
                      NULL);

    path = gtk_tree_path_new_from_string (path_str);
    gtk_tree_model_get_iter (view->priv->sortmodel, &iter, path);
    gtk_tree_model_sort_convert_iter_to_child_iter
        (GTK_TREE_MODEL_SORT (view->priv->sortmodel), &iter2, &iter);
    egg_tree_model_filter_convert_iter_to_child_iter
        (EGG_TREE_MODEL_FILTER (view->priv->filtermodel), &iter, &iter2);
    node = ephy_tree_model_node_node_from_iter (view->priv->nodemodel, &iter);

    g_value_init (&value, G_TYPE_STRING);
    g_value_set_string (&value, new_text);
    ephy_node_set_property (node,
                    view->priv->editable_property,
                    &value);
    g_value_unset (&value);
}

static int
ephy_node_view_sort_func (GtkTreeModel *model,
              GtkTreeIter *a,
              GtkTreeIter *b,
              gpointer user_data)
{
    GList *order;
    GList *l;
    int retval = 0;

    g_return_val_if_fail (model != NULL, 0);
    g_return_val_if_fail (user_data != NULL, 0);

    order = (GList *) user_data;

    for (l = order; l != NULL && retval == 0; l = g_list_next (l))
    {
        EphyTreeModelNodeColumn column = GPOINTER_TO_INT (l->data);
        GType type = gtk_tree_model_get_column_type (model, column);
        GValue a_value = {0, };
        GValue b_value = {0, };
        gchar *stra, *strb;
        gtk_tree_model_get_value (model, a, column, &a_value);
        gtk_tree_model_get_value (model, b, column, &b_value);

        switch (G_TYPE_FUNDAMENTAL (type))
        {
        case G_TYPE_STRING:
            stra = g_utf8_casefold (g_value_get_string (&a_value), -1);
            strb = g_utf8_casefold (g_value_get_string (&b_value), -1);
            g_return_val_if_fail (stra != NULL || strb != NULL, 0);
            retval = g_utf8_collate (stra, strb);
            g_free (stra);
            g_free (strb);
            break;
        case G_TYPE_INT:
            if (g_value_get_int (&a_value) < g_value_get_int (&b_value))
                retval = -1;
            else if (g_value_get_int (&a_value) == g_value_get_int (&b_value))
                retval = 0;
            else
                retval = 1;
            break;
        case G_TYPE_BOOLEAN:
            if (g_value_get_boolean (&a_value) < g_value_get_boolean (&b_value))
                retval = -1;
            else if (g_value_get_boolean (&a_value) == g_value_get_boolean (&b_value))
                retval = 0;
            else
                retval = 1;
            break;
        default:
            g_warning ("Attempting to sort on invalid type %s\n", g_type_name (type));
            break;
        }

        g_value_unset (&a_value);
        g_value_unset (&b_value);
    }

    return retval;

}

static void
provide_priority (EphyNode *node, GValue *value, EphyNodeView *view)
{
    int priority;

    g_value_init (value, G_TYPE_INT);
    priority = ephy_node_get_property_int (node, view->priv->priority_prop_id);
    if (priority == EPHY_NODE_VIEW_ALL_PRIORITY ||
        priority == EPHY_NODE_VIEW_SPECIAL_PRIORITY)
        g_value_set_int (value, priority);
    else
        g_value_set_int (value, EPHY_NODE_VIEW_NORMAL_PRIORITY);
}

static void
provide_text_weight (EphyNode *node, GValue *value, EphyNodeView *view)
{
    int priority;

    g_value_init (value, G_TYPE_INT);
    priority = ephy_node_get_property_int
        (node, view->priv->priority_prop_id);
    if (priority == EPHY_NODE_VIEW_ALL_PRIORITY ||
        priority == EPHY_NODE_VIEW_SPECIAL_PRIORITY)
    {
        g_value_set_int (value, PANGO_WEIGHT_BOLD);
    }
    else
    {
        g_value_set_int (value, PANGO_WEIGHT_NORMAL);
    }
}

GtkTreeViewColumn *
ephy_node_view_add_column (EphyNodeView *view,
               const char  *title,
               GType value_type,
               int prop_id,
               int priority_prop_id,
               EphyNodeViewFlags flags,
               EphyTreeModelNodeValueFunc icon_func)

{
    GtkTreeViewColumn *gcolumn;
    GtkCellRenderer *renderer;
    int column;
    int icon_column;

    g_return_val_if_fail (!(flags & EPHY_NODE_VIEW_EDITABLE) ||
                  view->priv->editable_renderer == NULL, NULL);

    column = ephy_tree_model_node_add_prop_column
        (view->priv->nodemodel, value_type, prop_id);

    gcolumn = (GtkTreeViewColumn *) gtk_tree_view_column_new ();

    if (icon_func)
    {
        icon_column = ephy_tree_model_node_add_func_column
                     (view->priv->nodemodel, GDK_TYPE_PIXBUF, icon_func, NULL);

        renderer = gtk_cell_renderer_pixbuf_new ();
        gtk_tree_view_column_pack_start (gcolumn, renderer, FALSE);
        gtk_tree_view_column_set_attributes (gcolumn, renderer,
                             "pixbuf", icon_column,
                             NULL);
    }

    renderer = gtk_cell_renderer_text_new ();

    if (flags & EPHY_NODE_VIEW_EDITABLE)
    {
        view->priv->editable_renderer = renderer;
        view->priv->editable_column = gcolumn;
        view->priv->editable_node_column = column;
        view->priv->editable_property = prop_id;
        g_signal_connect (renderer, "edited", G_CALLBACK (cell_renderer_edited), view);
    }

    gtk_tree_view_column_pack_start (gcolumn, renderer, TRUE);
    gtk_tree_view_column_set_attributes (gcolumn, renderer,
                         "text", column,
                         NULL);

    if (priority_prop_id >= 0)
    {
        int wcol;

        view->priv->priority_prop_id = priority_prop_id;

        wcol = ephy_tree_model_node_add_func_column
            (view->priv->nodemodel, G_TYPE_INT,
             (EphyTreeModelNodeValueFunc) provide_text_weight,
             view);
        gtk_tree_view_column_add_attribute (gcolumn, renderer,
                            "weight", wcol);
    }

    gtk_tree_view_column_set_title (gcolumn, title);
    gtk_tree_view_append_column (GTK_TREE_VIEW (view),
                     gcolumn);

    if (flags & EPHY_NODE_VIEW_USER_SORT)
    {
        GList *order = NULL;

        order = g_list_append (order, GINT_TO_POINTER (column));
        gtk_tree_sortable_set_sort_func
            (GTK_TREE_SORTABLE (view->priv->sortmodel),
             column, ephy_node_view_sort_func,
             order, (GtkDestroyNotify)g_list_free);
        gtk_tree_view_column_set_sort_column_id (gcolumn, column);
    }
    else if (flags & EPHY_NODE_VIEW_AUTO_SORT)
    {
        int scol;
        GList *order = NULL;

        if (priority_prop_id >= 0)
        {
            scol = ephy_tree_model_node_add_func_column
                (view->priv->nodemodel, G_TYPE_INT,
                 (EphyTreeModelNodeValueFunc) provide_priority,
                 view);
            order = g_list_append (order, GINT_TO_POINTER (scol));
        }

        order = g_list_append (order, GINT_TO_POINTER (column));
        gtk_tree_sortable_set_default_sort_func
            (GTK_TREE_SORTABLE (view->priv->sortmodel),
             ephy_node_view_sort_func,
             order, (GtkDestroyNotify)g_list_free);
        gtk_tree_sortable_set_sort_column_id
            (GTK_TREE_SORTABLE (view->priv->sortmodel),
             GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID,
             GTK_SORT_ASCENDING);
    }

    return gcolumn;
}

static void
ephy_node_view_init (EphyNodeView *view)
{
    view->priv = g_new0 (EphyNodeViewPrivate, 1);
    view->priv->editable_renderer = NULL;
    view->priv->editing = TRUE;
    view->priv->selected_node = NULL;
}

static void
get_selection (GtkTreeModel *model,
           GtkTreePath *path,
           GtkTreeIter *iter,
           void **data)
{
    GtkTreeModelSort *sortmodel = GTK_TREE_MODEL_SORT (model);
    EggTreeModelFilter *filtermodel = EGG_TREE_MODEL_FILTER (sortmodel->child_model);
    EphyTreeModelNode *nodemodel = EPHY_TREE_MODEL_NODE (filtermodel->child_model);
    GList **list = (GList **) data;
    GtkTreeIter *iter2 = gtk_tree_iter_copy (iter);
    GtkTreeIter iter3;
    GtkTreeIter iter4;
    EphyNode *node;

    gtk_tree_model_sort_convert_iter_to_child_iter (GTK_TREE_MODEL_SORT (model),
                            &iter3, iter2);
    egg_tree_model_filter_convert_iter_to_child_iter (filtermodel, &iter4, &iter3);

    node = ephy_tree_model_node_node_from_iter (nodemodel, &iter4);

    gtk_tree_iter_free (iter2);

    *list = g_list_prepend (*list, node);
}

GList *
ephy_node_view_get_selection (EphyNodeView *view)
{
    GList *list = NULL;
    GtkTreeSelection *selection;

    if (view->priv->selected_node)
    {
        list = g_list_append (list, view->priv->selected_node);
    }
    else
    {
        selection = gtk_tree_view_get_selection
            (GTK_TREE_VIEW (view));

        gtk_tree_selection_selected_foreach
            (selection,
             (GtkTreeSelectionForeachFunc) get_selection,
             (gpointer) &list);
    }

    return list;
}

void
ephy_node_view_remove (EphyNodeView *view)
{
    GList *list;
    EphyNode *node;
    GtkTreeIter iter, iter2;
    GtkTreePath *path;

    /* Before removing we try to select the next node in the view. If that is
     * not available we try with the previous one, and if that is absent too,
     * we do not select anything (which equals to select the topic "All")
     */

    list = ephy_node_view_get_selection (view);
    g_return_if_fail (list != NULL);
    node = g_list_last (list)->data;
    ephy_tree_model_node_iter_from_node (EPHY_TREE_MODEL_NODE (view->priv->nodemodel),
                         node, &iter);
    egg_tree_model_filter_convert_child_iter_to_iter (EGG_TREE_MODEL_FILTER (view->priv->filtermodel),
                              &iter2, &iter);
    gtk_tree_model_sort_convert_child_iter_to_iter (GTK_TREE_MODEL_SORT (view->priv->sortmodel),
                            &iter, &iter2);
    iter2 = iter;

    if (gtk_tree_model_iter_next (GTK_TREE_MODEL (view->priv->sortmodel), &iter))
    {
        path = gtk_tree_model_get_path (GTK_TREE_MODEL (view->priv->sortmodel), &iter);
        gtk_tree_view_set_cursor (GTK_TREE_VIEW (view), path, NULL, FALSE);
        gtk_tree_path_free (path);
    }
    else
    {
        path = gtk_tree_model_get_path (GTK_TREE_MODEL (view->priv->sortmodel), &iter2);
        if (gtk_tree_path_prev (path))
        {
            gtk_tree_view_set_cursor (GTK_TREE_VIEW (view), path, NULL, FALSE);
        }
        gtk_tree_path_free (path);
    }

    for (; list != NULL; list = list->next)
    {
        ephy_node_unref (list->data);
    }

    g_list_free (list);
}

void
ephy_node_view_select_node (EphyNodeView *view,
                EphyNode *node)
{
    GtkTreeIter iter, iter2;
    GValue val = { 0, };
    gboolean visible;

    g_return_if_fail (node != NULL);

    ephy_tree_model_node_iter_from_node (EPHY_TREE_MODEL_NODE (view->priv->nodemodel),
                         node, &iter);
    gtk_tree_model_get_value (GTK_TREE_MODEL (view->priv->nodemodel), &iter,
                  EPHY_TREE_MODEL_NODE_COL_VISIBLE, &val);
    visible = g_value_get_boolean (&val);
    g_value_unset (&val);
    if (visible == FALSE) return;

    egg_tree_model_filter_convert_child_iter_to_iter (EGG_TREE_MODEL_FILTER (view->priv->filtermodel),
                              &iter2, &iter);
    gtk_tree_model_sort_convert_child_iter_to_iter (GTK_TREE_MODEL_SORT (view->priv->sortmodel),
                            &iter, &iter2);

    gtk_tree_selection_select_iter (gtk_tree_view_get_selection (GTK_TREE_VIEW (view)),
                    &iter);
}

void
ephy_node_view_enable_drag_source (EphyNodeView *view,
                   GtkTargetEntry *types,
                   int n_types,
                   guint prop_id)
{
    GtkWidget *treeview;

    g_return_if_fail (view != NULL);

    treeview = GTK_WIDGET (view);

    egg_tree_multi_drag_add_drag_support (GTK_TREE_VIEW (treeview));

    gtk_tree_view_enable_model_drag_source (GTK_TREE_VIEW (treeview),
                        GDK_BUTTON1_MASK,
                        types, n_types,
                        GDK_ACTION_COPY);

    ephy_tree_model_sort_set_drag_property (EPHY_TREE_MODEL_SORT (view->priv->sortmodel),
                        prop_id);
}

void
ephy_node_view_edit (EphyNodeView *view)
{
    GtkTreeSelection *selection;
    GList *rows;
    GtkTreeModel *model;

    g_return_if_fail (view->priv->editable_renderer != NULL);

    selection = gtk_tree_view_get_selection
        (GTK_TREE_VIEW (view));
    rows = gtk_tree_selection_get_selected_rows (selection, &model);
    if (rows == NULL) return;

    g_object_set (G_OBJECT (view->priv->editable_renderer),
                      "editable", TRUE,
                      NULL);

    gtk_tree_view_set_cursor (GTK_TREE_VIEW (view),
                                  (GtkTreePath *)rows->data,
                                  view->priv->editable_column,
                                  TRUE);

    view->priv->editing = TRUE;

    g_list_foreach (rows, (GFunc)gtk_tree_path_free, NULL);
        g_list_free (rows);
}

gboolean
ephy_node_view_is_target (EphyNodeView *view)
{
    if (target_view == view)
    {
        return TRUE;
    }
    else if (target_view != NULL)
    {
        return FALSE;
    }
    else
    {
        return gtk_widget_is_focus (GTK_WIDGET (view));
    }
}

gboolean
ephy_node_view_has_selection (EphyNodeView *view, gboolean *multiple)
{
    GtkTreeSelection *selection;
    int rows;

    if (view->priv->selected_node)
    {
        rows = 1;
    }
    else
    {
        selection = gtk_tree_view_get_selection
            (GTK_TREE_VIEW (view));

        rows = gtk_tree_selection_count_selected_rows (selection);
    }

    if (multiple)
    {
        *multiple = rows > 1;
    }

    return rows > 0;
}