path: root/src/bookmarks/ephy-topics-palette.c

/*
 *  Copyright (C) 2002-2004 Marco Pesenti Gritti <mpeseng@tin.it>
 *  Copyright (C) 2005 Peter Harvey <pah06@uow.edu.au>
 *
 *  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.
 *
 *  $Id$
 */

#include "config.h"

#include "ephy-topics-palette.h"
#include "ephy-nodes-cover.h"
#include "ephy-node-common.h"
#include "ephy-bookmarks.h"
#include "ephy-debug.h"

#include <glib/gi18n.h>
#include <gtk/gtktreeselection.h>
#include <gdk/gdkkeysyms.h>

static void ephy_topics_palette_class_init (EphyTopicsPaletteClass *klass);
static void ephy_topics_palette_init (EphyTopicsPalette *editor);

#define EPHY_TOPICS_PALETTE_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_TOPICS_PALETTE, EphyTopicsPalettePrivate))

struct _EphyTopicsPalettePrivate
{
    EphyBookmarks *bookmarks;
    EphyNode *bookmark;
    GtkListStore *store;
    GtkTreeViewColumn *column;
    int mode;
};

enum
{
    PROP_0,
    PROP_BOOKMARKS,
    PROP_BOOKMARK,
    PROP_MODE
};

enum
{
    COLUMN_TITLE,
        COLUMN_NODE,
    COLUMN_SELECTED,
    COLUMNS
};

enum
{
    MODE_GROUPED,
    MODE_LIST,
    MODES
};

static GObjectClass *parent_class = NULL;

GType
ephy_topics_palette_get_type (void)
{
    static GType type = 0;

    if (G_UNLIKELY (type == 0))
    {
        static const GTypeInfo our_info =
        {
            sizeof (EphyTopicsPaletteClass),
            NULL,
            NULL,
            (GClassInitFunc) ephy_topics_palette_class_init,
            NULL,
            NULL,
            sizeof (EphyTopicsPalette),
            0,
            (GInstanceInitFunc) ephy_topics_palette_init
        };

        type = g_type_register_static (GTK_TYPE_TREE_VIEW,
                           "EphyTopicsPalette",
                           &our_info, 0);
    }

    return type;
}

static void
append_topics (EphyTopicsPalette *palette,
           GtkTreeIter *iter,
           gboolean *valid,
           gboolean *first,
           GPtrArray *topics)
{
    EphyNode *node;
    const char *title;
    gint i;
    
    if (topics->len == 0)
    {
        return;
    }
     
    if (!*first)
    {
        if (!*valid) gtk_list_store_append (palette->priv->store, iter);
        gtk_list_store_set (palette->priv->store, iter, COLUMN_TITLE, NULL,
                    COLUMN_NODE, NULL, -1);
        *valid = gtk_tree_model_iter_next (GTK_TREE_MODEL (palette->priv->store), iter);
    }

    for (i = 0; i < topics->len ; i++)
    {
        node = g_ptr_array_index (topics, i);
        title = ephy_node_get_property_string (node, EPHY_NODE_KEYWORD_PROP_NAME);
        
        if (!*valid) gtk_list_store_append (palette->priv->store, iter);
        gtk_list_store_set (palette->priv->store, iter, COLUMN_TITLE, title,
                    COLUMN_NODE, node, COLUMN_SELECTED,
                    ephy_node_has_child (node, palette->priv->bookmark), -1);
        *valid = gtk_tree_model_iter_next (GTK_TREE_MODEL (palette->priv->store), iter);
        *first = FALSE;
    }
}

static void
update_list (EphyTopicsPalette *palette)
{
    GPtrArray *children, *bookmarks, *topics;
    EphyNode *node;
    GtkTreeIter iter;
    gint i, priority;
    gboolean valid, first;
    
    gtk_widget_queue_draw (GTK_WIDGET (palette));
    valid = gtk_tree_model_get_iter_first (GTK_TREE_MODEL (palette->priv->store), &iter);
    first = TRUE;
    
    if (palette->priv->mode == MODE_LIST)
    {
        /* Allocate and fill the suggestions array. */
        node = ephy_bookmarks_get_keywords (palette->priv->bookmarks);
        children = ephy_node_get_children (node);
        topics = g_ptr_array_sized_new (children->len);
        for (i = 0; i < children->len; i++)
        {
            node = g_ptr_array_index (children, i);
            
            priority = ephy_node_get_property_int (node, EPHY_NODE_KEYWORD_PROP_PRIORITY);
            if (priority != EPHY_NODE_NORMAL_PRIORITY)
              continue;

            g_ptr_array_add (topics, node);
        }

        g_ptr_array_sort (topics, ephy_bookmarks_compare_topic_pointers);       
        append_topics (palette, &iter, &valid, &first, topics);
        g_ptr_array_free (topics, TRUE);
    }
    else if (palette->priv->mode == MODE_GROUPED)
    {
        GPtrArray *suggested, *selected;
        
        /* Allocate and fill the bookmarks array. */
        node = ephy_bookmarks_get_bookmarks (palette->priv->bookmarks);
        children = ephy_node_get_children (node);
        bookmarks = g_ptr_array_sized_new (children->len);
        for (i = 0; i < children->len; i++)
        {
            g_ptr_array_add(bookmarks, g_ptr_array_index (children, i));
        }
        
        /* Allocate and fill the topics array. */
        node = ephy_bookmarks_get_keywords (palette->priv->bookmarks);
        children = ephy_node_get_children (node);
        topics = g_ptr_array_sized_new (children->len);
        suggested = g_ptr_array_sized_new (children->len);
        selected = g_ptr_array_sized_new (children->len);
        for (i = 0; i < children->len; i++)
        {
            node = g_ptr_array_index (children, i);
            
            priority = ephy_node_get_property_int (node, EPHY_NODE_KEYWORD_PROP_PRIORITY);
            if (priority != EPHY_NODE_NORMAL_PRIORITY)
              continue;
            
            /* We'll consider only bookmarks covered by the same topics as our bookmark. */
            if (ephy_node_has_child (node, palette->priv->bookmark))
            {
                ephy_nodes_remove_not_covered (node, bookmarks);
                g_ptr_array_add (selected, node);
            }
            
            /* We'll onsider only topics that are not already selected for our bookmark. */
            else
            {
                g_ptr_array_add (topics, node);
            }
        }
    
        /* Get the minimum cover of topics for the bookmarks. */
        suggested = ephy_nodes_get_covering (topics, bookmarks, suggested, 0, 0);
        
        for (i = 0; i < suggested->len; i++)
        {
            g_ptr_array_remove_fast (topics, g_ptr_array_index (suggested, i));
        }
        
        /* Add any topics which cover the bookmarks completely in their own right, or 
           have no bookmarks currently associated with it. */
        for (i = 0; i < topics->len ; i++)
        {
            node = g_ptr_array_index (topics, i);
            if (!ephy_node_has_child (node, palette->priv->bookmark) &&
                 ephy_nodes_covered (node, bookmarks))
            {
                g_ptr_array_add (suggested, node);
                g_ptr_array_remove_index_fast (topics, i);
                i--;
            }
        }
    

        g_ptr_array_sort (selected, ephy_bookmarks_compare_topic_pointers);
        g_ptr_array_sort (suggested, ephy_bookmarks_compare_topic_pointers);
        g_ptr_array_sort (topics, ephy_bookmarks_compare_topic_pointers);
        append_topics (palette, &iter, &valid, &first, selected);
        append_topics (palette, &iter, &valid, &first, suggested);
        append_topics (palette, &iter, &valid, &first, topics);
        g_ptr_array_free (selected, TRUE);
        g_ptr_array_free (suggested, TRUE);
        g_ptr_array_free (bookmarks, TRUE);
        g_ptr_array_free (topics, TRUE);
    }
    
    while (valid)
    {
        valid = gtk_list_store_remove (palette->priv->store, &iter);
    }
    
    gtk_tree_selection_unselect_all
      (gtk_tree_view_get_selection (GTK_TREE_VIEW (palette)));
}

static void
tree_changed_cb (EphyBookmarks *bookmarks,
         EphyTopicsPalette *palette)
{
    update_list (palette);
}

static void
node_added_cb (EphyNode *parent,
           EphyNode *child,
           EphyTopicsPalette *palette)
{
    update_list (palette);
}

static void
node_changed_cb (EphyNode *parent,
         EphyNode *child,
         guint property_id,
         EphyTopicsPalette *palette)
{
    update_list (palette);
}

static void
node_removed_cb (EphyNode *parent,
         EphyNode *child,
         guint index,
         EphyTopicsPalette *palette)
{
    update_list (palette);
}

static void
ephy_topics_palette_set_property (GObject *object,
                           guint prop_id,
                           const GValue *value,
                           GParamSpec *pspec)
{
    EphyTopicsPalette *palette = EPHY_TOPICS_PALETTE (object);
    EphyNode *node;

    switch (prop_id)
    {
    case PROP_BOOKMARKS:
        palette->priv->bookmarks = g_value_get_object (value);
        node = ephy_bookmarks_get_keywords (palette->priv->bookmarks);
        ephy_node_signal_connect_object (node, EPHY_NODE_CHILD_ADDED,
                   (EphyNodeCallback) node_added_cb, object);
        ephy_node_signal_connect_object (node, EPHY_NODE_CHILD_CHANGED,
                   (EphyNodeCallback) node_changed_cb, object);
        ephy_node_signal_connect_object (node, EPHY_NODE_CHILD_REMOVED,
                   (EphyNodeCallback) node_removed_cb, object);
        g_signal_connect_object (palette->priv->bookmarks, "tree-changed",
                     G_CALLBACK (tree_changed_cb), palette,
                     G_CONNECT_AFTER);
        break;
    case PROP_BOOKMARK:
        palette->priv->bookmark = g_value_get_pointer (value);
        break;
    case PROP_MODE:
        palette->priv->mode = g_value_get_int (value);
        update_list (palette);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
        break;
    }
}

static void
cell_edited (GtkCellRendererText *renderer,
         const char *path_str,
         const char *new_text,
         EphyTopicsPalette *palette)
{
    if (*new_text != 0)
    {
        EphyNode *node;
        node = ephy_bookmarks_add_keyword (palette->priv->bookmarks, new_text);
        ephy_bookmarks_set_keyword (palette->priv->bookmarks, node,
                        palette->priv->bookmark);
    }
    else
    {
        update_list (palette);
    }
}

static void
toggled (GtkCellRendererToggle *cell_renderer,
     gchar *path,
     EphyTopicsPalette *palette)
{
    EphyNode *topic;
    GtkTreeModel *model;
    GtkTreeIter iter;
    
    model = gtk_tree_view_get_model (GTK_TREE_VIEW (palette));

    g_return_if_fail(gtk_tree_model_get_iter_from_string (model, &iter, path));

    gtk_tree_model_get (model, &iter, COLUMN_NODE, &topic, -1);
    
    /* Need to protect against toggling separators. */
    if (topic == NULL) return;
    
    if (ephy_node_has_child (topic, palette->priv->bookmark))
    {
        ephy_bookmarks_unset_keyword (palette->priv->bookmarks,
                          topic,
                          palette->priv->bookmark);
    }
    else
    {
        ephy_bookmarks_set_keyword (palette->priv->bookmarks,
                        topic,
                        palette->priv->bookmark);
    }
}

static gboolean
is_separator (GtkTreeModel *model,
          GtkTreeIter *iter,
          gpointer data)
{
    EphyNode *node;
    gtk_tree_model_get (model, iter, COLUMN_NODE, &node, -1);
    return (node == NULL);
}

static GObject *
ephy_topics_palette_constructor (GType type,
                 guint n_construct_properties,
                 GObjectConstructParam *construct_params)

{
    GObject *object;
    EphyTopicsPalette *palette;
    EphyTopicsPalettePrivate *priv;
    GtkCellRenderer *renderer;

    object = parent_class->constructor (type, n_construct_properties,
                                            construct_params);
    palette = EPHY_TOPICS_PALETTE (object);
    priv = EPHY_TOPICS_PALETTE_GET_PRIVATE (object);

    priv->store = gtk_list_store_new (COLUMNS, G_TYPE_STRING, G_TYPE_POINTER, G_TYPE_BOOLEAN);
    gtk_tree_view_set_model (GTK_TREE_VIEW (object), GTK_TREE_MODEL (priv->store));
    g_object_unref (priv->store);

    priv->column = gtk_tree_view_column_new ();
    
    renderer = gtk_cell_renderer_toggle_new ();
    gtk_tree_view_column_pack_start (priv->column, renderer, FALSE);
    gtk_tree_view_column_add_attribute (priv->column, renderer, "active", COLUMN_SELECTED);
    g_signal_connect (renderer, "toggled", G_CALLBACK (toggled), palette);
    
    renderer = gtk_cell_renderer_text_new ();
    gtk_tree_view_column_pack_start (priv->column, renderer, TRUE);
    gtk_tree_view_column_add_attribute (priv->column, renderer, "text", COLUMN_TITLE);
    g_signal_connect (renderer, "edited", G_CALLBACK (cell_edited), palette);

    gtk_tree_view_append_column (GTK_TREE_VIEW (object), priv->column);

    gtk_tree_view_set_row_separator_func (GTK_TREE_VIEW (object), is_separator, NULL, NULL);
    gtk_tree_view_set_enable_search (GTK_TREE_VIEW (object), TRUE);
    gtk_tree_view_set_search_column (GTK_TREE_VIEW (object), COLUMN_TITLE);
    gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (object), FALSE);
    gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW (object)), GTK_SELECTION_BROWSE);
    
    update_list (palette);
    
    return object;
}

static void
ephy_topics_palette_init (EphyTopicsPalette *palette)
{
    palette->priv = EPHY_TOPICS_PALETTE_GET_PRIVATE (palette);
}

GtkWidget *
ephy_topics_palette_new (EphyBookmarks *bookmarks,
             EphyNode *bookmark)
{
    EphyTopicsPalette *palette;

    g_assert (bookmarks != NULL);

    palette = EPHY_TOPICS_PALETTE (g_object_new
                       (EPHY_TYPE_TOPICS_PALETTE,
                    "bookmarks", bookmarks,
                    "bookmark", bookmark,
                    NULL));

    return GTK_WIDGET (palette);
}

static void
ephy_topics_palette_class_init (EphyTopicsPaletteClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);
    
    parent_class = g_type_class_peek_parent (klass);

    object_class->set_property = ephy_topics_palette_set_property;
    object_class->constructor = ephy_topics_palette_constructor;
    
    g_object_class_install_property (object_class,
                     PROP_BOOKMARKS,
                     g_param_spec_object ("bookmarks",
                                  "Bookmarks set",
                                  "Bookmarks set",
                                  EPHY_TYPE_BOOKMARKS,
                                  G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
                                  G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | 
                                  G_PARAM_STATIC_BLURB));

    g_object_class_install_property (object_class,
                     PROP_BOOKMARK,
                     g_param_spec_pointer ("bookmark",
                                   "Bookmark",
                                   "Bookmark",
                                   G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
                                   G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | 
                                   G_PARAM_STATIC_BLURB));

    g_object_class_install_property (object_class,
                     PROP_MODE,
                     g_param_spec_int ("mode",
                               "Mode",
                               "Mode",
                               0, MODES-1, 0, 
                               G_PARAM_WRITABLE |
                               G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK |
                               G_PARAM_STATIC_BLURB));

    g_type_class_add_private (object_class, sizeof(EphyTopicsPalettePrivate));
}