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gtksourcetagtable.c

/*  gtksourcetagtable.c
 *
 *  Copyright (C) 2003 - Paolo Maggi <paolo.maggi@polito.it>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Library 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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library 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 "gtksourcetagtable.h"

#include "gtksourceview-marshal.h"
#include "gtksourcetag.h"

struct _GtkSourceTagTablePrivate
{
      gulong tag_added_id;
      gulong tag_removed_id;
      gulong tag_changed_id;
};

enum
{
      CHANGED,
      LAST_SIGNAL
};

static GtkTextTagTableClass *parent_class = NULL;

static void  gtk_source_tag_table_class_init          (GtkSourceTagTableClass *klass);
static void  gtk_source_tag_table_instance_init (GtkSourceTagTable *lm);
static void  gtk_source_tag_table_finalize            (GObject                *object);

static guint signals[LAST_SIGNAL] = { 0 };

GType
gtk_source_tag_table_get_type (void)
{
      static GType tag_table_type = 0;

      if (tag_table_type == 0)
      {
                  static const GTypeInfo our_info =
                  {
                  sizeof (GtkSourceTagTableClass),
                  NULL,       /* base_init */
                  NULL,       /* base_finalize */
                  (GClassInitFunc) gtk_source_tag_table_class_init,
                  NULL,           /* class_finalize */
                  NULL,           /* class_data */
                  sizeof (GtkSourceTagTable),
                  0,              /* n_preallocs */
                  (GInstanceInitFunc) gtk_source_tag_table_instance_init
                  };

                  tag_table_type = g_type_register_static (GTK_TYPE_TEXT_TAG_TABLE,
                                              "GtkSourceTagTable",
                                              &our_info,
                                              0);
      }

      return tag_table_type;
}

static void
gtk_source_tag_table_class_init (GtkSourceTagTableClass *klass)
{
      GObjectClass *object_class = G_OBJECT_CLASS (klass);

      parent_class            = g_type_class_peek_parent (klass);
      object_class->finalize  = gtk_source_tag_table_finalize;

      signals[CHANGED] =
            g_signal_new ("changed",
                        G_OBJECT_CLASS_TYPE (object_class),
                        G_SIGNAL_RUN_LAST,
                        G_STRUCT_OFFSET (GtkSourceTagTableClass, changed),
                        NULL,
                        NULL,
                        gtksourceview_marshal_VOID__VOID,
                        G_TYPE_NONE,
                        0);
}

static void 
tag_added_or_removed_cb (GtkTextTagTable *table, GtkTextTag *tag)
{
      g_signal_emit (table, signals[CHANGED], 0);
}

static void 
tag_changed_cb (GtkTextTagTable *table, GtkTextTag *tag, gboolean size_changed)
{
      g_signal_emit (table, signals[CHANGED], 0);
}

static void
gtk_source_tag_table_instance_init (GtkSourceTagTable *tt)
{

      tt->priv = g_new0 (GtkSourceTagTablePrivate, 1);

      tt->priv->tag_added_id =
            g_signal_connect (G_OBJECT (tt),
                          "tag_added",
                          G_CALLBACK (tag_added_or_removed_cb),
                          NULL);

      tt->priv->tag_removed_id =
            g_signal_connect (G_OBJECT (tt),
                          "tag_removed",
                          G_CALLBACK (tag_added_or_removed_cb),
                          NULL);

      tt->priv->tag_changed_id =
            g_signal_connect (G_OBJECT (tt),
                          "tag_changed",
                          G_CALLBACK (tag_changed_cb),
                          NULL);                  
}

static void
gtk_source_tag_table_finalize (GObject *object)
{
      GtkSourceTagTable *tt = GTK_SOURCE_TAG_TABLE (object);
      
      g_free (tt->priv);

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


/**
 * gtk_source_tag_table_new:
 * 
 * Creates a new #GtkSourceTagTable. The table contains no tags by
 * default.
 * 
 * Return value: a new #GtkSourceTagTable
 **/

GtkSourceTagTable *
gtk_source_tag_table_new (void)
{
      GtkSourceTagTable *table;

      table = g_object_new (GTK_TYPE_SOURCE_TAG_TABLE, NULL);

      return table;
      
}

static void
block_signals (GtkSourceTagTable *tt)
{
      g_signal_handler_block (tt, tt->priv->tag_added_id); 
      g_signal_handler_block (tt, tt->priv->tag_removed_id); 
      g_signal_handler_block (tt, tt->priv->tag_changed_id); 
}

static void
unblock_signals (GtkSourceTagTable *tt)
{
      g_signal_handler_unblock (tt, tt->priv->tag_added_id); 
      g_signal_handler_unblock (tt, tt->priv->tag_removed_id); 
      g_signal_handler_unblock (tt, tt->priv->tag_changed_id); 
}


/**
 * gtk_source_tag_table_add_tags:
 * @table: a #GtkSourceTagTable
 * @tags: a #GSList containing #GtkTextTag objects 
 *
 * Add a list of tag to the table. The added tags are assigned the highest priority
 * in the table.
 *
 * If a tag is already present in table or has the same name as an already-added tag,
 * then it is not added to the table.
 **/
void 
gtk_source_tag_table_add_tags (GtkSourceTagTable *table, const GSList *tags)
{
      gint old_size;
      
      g_return_if_fail (GTK_IS_SOURCE_TAG_TABLE (table));

      old_size = gtk_text_tag_table_get_size (GTK_TEXT_TAG_TABLE (table));

      block_signals (table);
      
      while (tags != NULL)
      {
            gtk_text_tag_table_add (GTK_TEXT_TAG_TABLE (table), GTK_TEXT_TAG (tags->data));

            tags = g_slist_next (tags);
      }

      unblock_signals (table);

      if (gtk_text_tag_table_get_size (GTK_TEXT_TAG_TABLE (table)) != old_size)
      {
            g_signal_emit (table, signals[CHANGED], 0);
      }
}

static void
foreach_remove_tag (GtkTextTag *tag, gpointer data)
{
      GSList **tags = data;

      if (GTK_IS_SOURCE_TAG (tag))
            *tags = g_slist_prepend (*tags, tag);
}


/**
 * gtk_source_tag_table_remove_source_tags:
 * @table: a #GtkSourceTagTable
 * 
 * Remove all the source tags from the table. This will remove the table's
 * reference to the tags, so be careful - tags will end
 * up destroyed if you don't have a reference to them.
 **/
void 
gtk_source_tag_table_remove_source_tags (GtkSourceTagTable *table)
{
      GSList *tags = NULL;
      gint old_size;
      
      g_return_if_fail (GTK_IS_SOURCE_TAG_TABLE (table));

      old_size = gtk_text_tag_table_get_size (GTK_TEXT_TAG_TABLE (table));
      
      block_signals (table);

      gtk_text_tag_table_foreach (GTK_TEXT_TAG_TABLE (table), foreach_remove_tag, &tags);

      while (tags)
      {
            gtk_text_tag_table_remove (GTK_TEXT_TAG_TABLE (table),
                                 GTK_TEXT_TAG (tags->data));
            tags = g_slist_next (tags);
      }
      g_slist_free (tags);
      
      unblock_signals (table);

      if (gtk_text_tag_table_get_size (GTK_TEXT_TAG_TABLE (table)) != old_size)
            g_signal_emit (table, signals[CHANGED], 0);
}





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