Blame gtk/gtktexttagtable.c

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/* GTK - The GIMP Toolkit
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 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the
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 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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 * Boston, MA 02111-1307, USA.
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 */
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/*
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 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
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 * file for a list of people on the GTK+ Team.  See the ChangeLog
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 * files for a list of changes.  These files are distributed with
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 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
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 */
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#include "config.h"
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#include "gtktexttagtable.h"
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#include "gtkbuildable.h"
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#include "gtkmarshalers.h"
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#include "gtktextbuffer.h" /* just for the lame notify_will_remove_tag hack */
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#include "gtkintl.h"
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#include "gtkalias.h"
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#include <stdlib.h>
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/**
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 * SECTION:gtktexttagtable
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 * @Short_description: Collection of tags that can be used together
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 * @Title: GtkTextTagTable
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 *
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 * You may wish to begin by reading the <link linkend="TextWidget">text widget
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 * conceptual overview</link> which gives an overview of all the objects and data
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 * types related to the text widget and how they work together.
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 *
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 * <refsect2 id="GtkTextTagTable-BUILDER-UI">
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 * <title>GtkTextTagTables as GtkBuildable</title>
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 * <para>
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 * The GtkTextTagTable implementation of the GtkBuildable interface
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 * supports adding tags by specifying "tag" as the "type"
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 * attribute of a <child> element.
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 * </para>
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 * <example>
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 * <title>A UI definition fragment specifying tags</title>
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 * <programlisting>
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 * <object class="GtkTextTagTable">
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 *  <child type="tag">
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 *    <object class="GtkTextTag"/>
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 *  </child>
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 * </object>
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 * ]]></programlisting>
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 * </example>
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 * </refsect2>
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 */
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enum {
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  TAG_CHANGED,
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  TAG_ADDED,
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  TAG_REMOVED,
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  LAST_SIGNAL
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};
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enum {
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  LAST_ARG
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};
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static void gtk_text_tag_table_finalize     (GObject              *object);
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static void gtk_text_tag_table_set_property (GObject              *object,
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                                             guint                 prop_id,
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                                             const GValue         *value,
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                                             GParamSpec           *pspec);
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static void gtk_text_tag_table_get_property (GObject              *object,
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                                             guint                 prop_id,
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                                             GValue               *value,
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                                             GParamSpec           *pspec);
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static void gtk_text_tag_table_buildable_interface_init (GtkBuildableIface   *iface);
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static void gtk_text_tag_table_buildable_add_child      (GtkBuildable        *buildable,
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							 GtkBuilder          *builder,
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							 GObject             *child,
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							 const gchar         *type);
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static guint signals[LAST_SIGNAL] = { 0 };
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G_DEFINE_TYPE_WITH_CODE (GtkTextTagTable, gtk_text_tag_table, G_TYPE_OBJECT,
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                         G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
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                                                gtk_text_tag_table_buildable_interface_init))
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static void
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gtk_text_tag_table_class_init (GtkTextTagTableClass *klass)
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{
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  GObjectClass *object_class = G_OBJECT_CLASS (klass);
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  object_class->set_property = gtk_text_tag_table_set_property;
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  object_class->get_property = gtk_text_tag_table_get_property;
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  object_class->finalize = gtk_text_tag_table_finalize;
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  signals[TAG_CHANGED] =
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    g_signal_new (I_("tag-changed"),
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                  G_OBJECT_CLASS_TYPE (object_class),
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                  G_SIGNAL_RUN_LAST,
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                  G_STRUCT_OFFSET (GtkTextTagTableClass, tag_changed),
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                  NULL, NULL,
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                  _gtk_marshal_VOID__OBJECT_BOOLEAN,
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                  G_TYPE_NONE,
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                  2,
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                  GTK_TYPE_TEXT_TAG,
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                  G_TYPE_BOOLEAN);  
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  signals[TAG_ADDED] =
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    g_signal_new (I_("tag-added"),
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                  G_OBJECT_CLASS_TYPE (object_class),
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                  G_SIGNAL_RUN_LAST,
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                  G_STRUCT_OFFSET (GtkTextTagTableClass, tag_added),
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                  NULL, NULL,
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                  _gtk_marshal_VOID__OBJECT,
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                  G_TYPE_NONE,
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                  1,
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                  GTK_TYPE_TEXT_TAG);
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  signals[TAG_REMOVED] =
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    g_signal_new (I_("tag-removed"),  
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                  G_OBJECT_CLASS_TYPE (object_class),
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                  G_SIGNAL_RUN_LAST,
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                  G_STRUCT_OFFSET (GtkTextTagTableClass, tag_removed),
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                  NULL, NULL,
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                  _gtk_marshal_VOID__OBJECT,
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                  G_TYPE_NONE,
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                  1,
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                  GTK_TYPE_TEXT_TAG);
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}
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static void
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gtk_text_tag_table_init (GtkTextTagTable *table)
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{
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  table->hash = g_hash_table_new (g_str_hash, g_str_equal);
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}
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/**
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 * gtk_text_tag_table_new:
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 * 
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 * Creates a new #GtkTextTagTable. The table contains no tags by
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 * default.
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 * 
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 * Return value: a new #GtkTextTagTable
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 **/
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GtkTextTagTable*
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gtk_text_tag_table_new (void)
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{
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  GtkTextTagTable *table;
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  table = g_object_new (GTK_TYPE_TEXT_TAG_TABLE, NULL);
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  return table;
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}
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static void
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foreach_unref (GtkTextTag *tag, gpointer data)
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{
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  GSList *tmp;
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  /* We don't want to emit the remove signal here; so we just unparent
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   * and unref the tag.
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   */
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  tmp = tag->table->buffers;
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  while (tmp != NULL)
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    {
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      _gtk_text_buffer_notify_will_remove_tag (GTK_TEXT_BUFFER (tmp->data),
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                                               tag);
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      tmp = tmp->next;
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    }
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  tag->table = NULL;
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  g_object_unref (tag);
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}
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static void
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gtk_text_tag_table_finalize (GObject *object)
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{
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  GtkTextTagTable *table;
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  table = GTK_TEXT_TAG_TABLE (object);
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  gtk_text_tag_table_foreach (table, foreach_unref, NULL);
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  g_hash_table_destroy (table->hash);
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  g_slist_free (table->anonymous);
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  g_slist_free (table->buffers);
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  G_OBJECT_CLASS (gtk_text_tag_table_parent_class)->finalize (object);
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}
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static void
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gtk_text_tag_table_set_property (GObject      *object,
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                                 guint         prop_id,
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                                 const GValue *value,
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                                 GParamSpec   *pspec)
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{
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  switch (prop_id)
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    {
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    default:
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      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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      break;
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    }
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}
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static void
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gtk_text_tag_table_get_property (GObject      *object,
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                                 guint         prop_id,
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                                 GValue       *value,
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                                 GParamSpec   *pspec)
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{
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  switch (prop_id)
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    {
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    default:
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      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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      break;
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    }
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}
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static void
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gtk_text_tag_table_buildable_interface_init (GtkBuildableIface   *iface)
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{
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  iface->add_child = gtk_text_tag_table_buildable_add_child;
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}
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static void
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gtk_text_tag_table_buildable_add_child (GtkBuildable        *buildable,
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					GtkBuilder          *builder,
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					GObject             *child,
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					const gchar         *type)
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{
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  if (type && strcmp (type, "tag") == 0)
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    gtk_text_tag_table_add (GTK_TEXT_TAG_TABLE (buildable),
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			    GTK_TEXT_TAG (child));
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}
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/**
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 * gtk_text_tag_table_add:
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 * @table: a #GtkTextTagTable
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 * @tag: a #GtkTextTag
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 *
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 * Add a tag to the table. The tag is assigned the highest priority
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 * in the table.
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 *
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 * @tag must not be in a tag table already, and may not have
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 * the same name as an already-added tag.
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 **/
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void
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gtk_text_tag_table_add (GtkTextTagTable *table,
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                        GtkTextTag      *tag)
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{
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  guint size;
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  g_return_if_fail (GTK_IS_TEXT_TAG_TABLE (table));
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  g_return_if_fail (GTK_IS_TEXT_TAG (tag));
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  g_return_if_fail (tag->table == NULL);
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  if (tag->name && g_hash_table_lookup (table->hash, tag->name))
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    {
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      g_warning ("A tag named '%s' is already in the tag table.",
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                 tag->name);
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      return;
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    }
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  g_object_ref (tag);
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  if (tag->name)
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    g_hash_table_insert (table->hash, tag->name, tag);
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  else
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    {
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      table->anonymous = g_slist_prepend (table->anonymous, tag);
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      table->anon_count += 1;
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    }
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  tag->table = table;
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  /* We get the highest tag priority, as the most-recently-added
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     tag. Note that we do NOT use gtk_text_tag_set_priority,
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     as it assumes the tag is already in the table. */
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  size = gtk_text_tag_table_get_size (table);
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  g_assert (size > 0);
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  tag->priority = size - 1;
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  g_signal_emit (table, signals[TAG_ADDED], 0, tag);
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}
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/**
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 * gtk_text_tag_table_lookup:
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 * @table: a #GtkTextTagTable 
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 * @name: name of a tag
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 * 
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 * Look up a named tag.
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 * 
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 * Return value: (transfer none): The tag, or %NULL if none by that name is in the table.
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 **/
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GtkTextTag*
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gtk_text_tag_table_lookup (GtkTextTagTable *table,
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                           const gchar     *name)
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{
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  g_return_val_if_fail (GTK_IS_TEXT_TAG_TABLE (table), NULL);
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  g_return_val_if_fail (name != NULL, NULL);
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  return g_hash_table_lookup (table->hash, name);
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}
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/**
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 * gtk_text_tag_table_remove:
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 * @table: a #GtkTextTagTable
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 * @tag: a #GtkTextTag
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 * 
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 * Remove a tag from the table. This will remove the table's
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 * reference to the tag, so be careful - the tag will end
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 * up destroyed if you don't have a reference to it.
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 **/
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void
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gtk_text_tag_table_remove (GtkTextTagTable *table,
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                           GtkTextTag      *tag)
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{
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  GSList *tmp;
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  g_return_if_fail (GTK_IS_TEXT_TAG_TABLE (table));
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  g_return_if_fail (GTK_IS_TEXT_TAG (tag));
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  g_return_if_fail (tag->table == table);
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  /* Our little bad hack to be sure buffers don't still have the tag
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   * applied to text in the buffer
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   */
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  tmp = table->buffers;
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  while (tmp != NULL)
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    {
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      _gtk_text_buffer_notify_will_remove_tag (GTK_TEXT_BUFFER (tmp->data),
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                                               tag);
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      tmp = tmp->next;
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    }
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  /* Set ourselves to the highest priority; this means
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     when we're removed, there won't be any gaps in the
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     priorities of the tags in the table. */
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  gtk_text_tag_set_priority (tag, gtk_text_tag_table_get_size (table) - 1);
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  tag->table = NULL;
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  if (tag->name)
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    g_hash_table_remove (table->hash, tag->name);
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  else
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    {
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      table->anonymous = g_slist_remove (table->anonymous, tag);
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      table->anon_count -= 1;
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    }
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  g_signal_emit (table, signals[TAG_REMOVED], 0, tag);
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  g_object_unref (tag);
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}
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struct ForeachData
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{
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  GtkTextTagTableForeach func;
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  gpointer data;
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};
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static void
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hash_foreach (gpointer key, gpointer value, gpointer data)
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{
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  struct ForeachData *fd = data;
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  g_return_if_fail (GTK_IS_TEXT_TAG (value));
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  (* fd->func) (value, fd->data);
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}
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static void
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list_foreach (gpointer data, gpointer user_data)
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{
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  struct ForeachData *fd = user_data;
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  g_return_if_fail (GTK_IS_TEXT_TAG (data));
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  (* fd->func) (data, fd->data);
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}
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/**
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 * gtk_text_tag_table_foreach:
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 * @table: a #GtkTextTagTable
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 * @func: (scope call): a function to call on each tag
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 * @data: user data
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 *
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 * Calls @func on each tag in @table, with user data @data.
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 * Note that the table may not be modified while iterating 
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 * over it (you can't add/remove tags).
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 **/
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void
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gtk_text_tag_table_foreach (GtkTextTagTable       *table,
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                            GtkTextTagTableForeach func,
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                            gpointer               data)
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{
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  struct ForeachData d;
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  g_return_if_fail (GTK_IS_TEXT_TAG_TABLE (table));
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  g_return_if_fail (func != NULL);
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  d.func = func;
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  d.data = data;
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  g_hash_table_foreach (table->hash, hash_foreach, &d);
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  g_slist_foreach (table->anonymous, list_foreach, &d);
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}
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/**
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 * gtk_text_tag_table_get_size:
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 * @table: a #GtkTextTagTable
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 * 
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 * Returns the size of the table (number of tags)
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 * 
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 * Return value: number of tags in @table
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 **/
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gint
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gtk_text_tag_table_get_size (GtkTextTagTable *table)
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{
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  g_return_val_if_fail (GTK_IS_TEXT_TAG_TABLE (table), 0);
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  return g_hash_table_size (table->hash) + table->anon_count;
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}
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void
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_gtk_text_tag_table_add_buffer (GtkTextTagTable *table,
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                                gpointer         buffer)
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{
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  g_return_if_fail (GTK_IS_TEXT_TAG_TABLE (table));
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  table->buffers = g_slist_prepend (table->buffers, buffer);
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}
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static void
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foreach_remove_tag (GtkTextTag *tag, gpointer data)
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{
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  GtkTextBuffer *buffer;
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  buffer = GTK_TEXT_BUFFER (data);
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  _gtk_text_buffer_notify_will_remove_tag (buffer, tag);
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}
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void
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_gtk_text_tag_table_remove_buffer (GtkTextTagTable *table,
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                                   gpointer         buffer)
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{
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  g_return_if_fail (GTK_IS_TEXT_TAG_TABLE (table));
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  gtk_text_tag_table_foreach (table, foreach_remove_tag, buffer);
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  table->buffers = g_slist_remove (table->buffers, buffer);
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}
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#define __GTK_TEXT_TAG_TABLE_C__
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#include "gtkaliasdef.c"