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gtk2/gtk/gtktexttagtable.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library 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) any later version.
*
* This library 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 this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtktexttagtable.h"
#include "gtkbuildable.h"
#include "gtktexttagprivate.h"
#include "gtkmarshalers.h"
#include "gtktextbuffer.h" /* just for the lame notify_will_remove_tag hack */
#include "gtkintl.h"
#include <stdlib.h>
/**
* SECTION:gtktexttagtable
* @Short_description: Collection of tags that can be used together
* @Title: GtkTextTagTable
*
* You may wish to begin by reading the <link linkend="TextWidget">text widget
* conceptual overview</link> which gives an overview of all the objects and
* data types related to the text widget and how they work together.
*
* <refsect2 id="GtkTextTagTable-BUILDER-UI">
* <title>GtkTextTagTables as GtkBuildable</title>
* <para>
* The GtkTextTagTable implementation of the GtkBuildable interface
* supports adding tags by specifying "tag" as the "type"
* attribute of a &lt;child&gt; element.
*
* <example>
* <title>A UI definition fragment specifying tags</title>
* <programlisting><![CDATA[
* <object class="GtkTextTagTable">
* <child type="tag">
* <object class="GtkTextTag"/>
* </child>
* </object>
* ]]></programlisting>
* </example>
* </para>
* </refsect2>
*/
struct _GtkTextTagTablePrivate
{
GHashTable *hash;
GSList *anonymous;
GSList *buffers;
gint anon_count;
};
enum {
TAG_CHANGED,
TAG_ADDED,
TAG_REMOVED,
LAST_SIGNAL
};
static void gtk_text_tag_table_finalize (GObject *object);
static void gtk_text_tag_table_buildable_interface_init (GtkBuildableIface *iface);
static void gtk_text_tag_table_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *type);
static guint signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE_WITH_CODE (GtkTextTagTable, gtk_text_tag_table, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_text_tag_table_buildable_interface_init))
static void
gtk_text_tag_table_class_init (GtkTextTagTableClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gtk_text_tag_table_finalize;
/**
* GtkTextTagTable::tag-changed:
* @texttagtable: the object which received the signal.
* @tag: the changed tag.
* @size_changed: whether the size has been changed.
*/
signals[TAG_CHANGED] =
g_signal_new (I_("tag-changed"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTextTagTableClass, tag_changed),
NULL, NULL,
_gtk_marshal_VOID__OBJECT_BOOLEAN,
G_TYPE_NONE,
2,
GTK_TYPE_TEXT_TAG,
G_TYPE_BOOLEAN);
/**
* GtkTextTagTable::tag-added:
* @texttagtable: the object which received the signal.
* @tag: the added tag.
*/
signals[TAG_ADDED] =
g_signal_new (I_("tag-added"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTextTagTableClass, tag_added),
NULL, NULL,
_gtk_marshal_VOID__OBJECT,
G_TYPE_NONE,
1,
GTK_TYPE_TEXT_TAG);
/**
* GtkTextTagTable::tag-removed:
* @texttagtable: the object which received the signal.
* @tag: the removed tag.
*/
signals[TAG_REMOVED] =
g_signal_new (I_("tag-removed"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkTextTagTableClass, tag_removed),
NULL, NULL,
_gtk_marshal_VOID__OBJECT,
G_TYPE_NONE,
1,
GTK_TYPE_TEXT_TAG);
g_type_class_add_private (klass, sizeof (GtkTextTagTablePrivate));
}
static void
gtk_text_tag_table_init (GtkTextTagTable *table)
{
GtkTextTagTablePrivate *priv;
table->priv = G_TYPE_INSTANCE_GET_PRIVATE (table,
GTK_TYPE_TEXT_TAG_TABLE,
GtkTextTagTablePrivate);
priv = table->priv;
priv->hash = g_hash_table_new (g_str_hash, g_str_equal);
}
/**
* gtk_text_tag_table_new:
*
* Creates a new #GtkTextTagTable. The table contains no tags by
* default.
*
* Return value: a new #GtkTextTagTable
**/
GtkTextTagTable*
gtk_text_tag_table_new (void)
{
GtkTextTagTable *table;
table = g_object_new (GTK_TYPE_TEXT_TAG_TABLE, NULL);
return table;
}
static void
foreach_unref (GtkTextTag *tag, gpointer data)
{
GtkTextTagTable *table = GTK_TEXT_TAG_TABLE (tag->priv->table);
GtkTextTagTablePrivate *priv = table->priv;
GSList *l;
/* We don't want to emit the remove signal here; so we just unparent
* and unref the tag.
*/
for (l = priv->buffers; l != NULL; l = l->next)
_gtk_text_buffer_notify_will_remove_tag (GTK_TEXT_BUFFER (l->data),
tag);
tag->priv->table = NULL;
g_object_unref (tag);
}
static void
gtk_text_tag_table_finalize (GObject *object)
{
GtkTextTagTable *table = GTK_TEXT_TAG_TABLE (object);
GtkTextTagTablePrivate *priv = table->priv;
gtk_text_tag_table_foreach (table, foreach_unref, NULL);
g_hash_table_destroy (priv->hash);
g_slist_free (priv->anonymous);
g_slist_free (priv->buffers);
G_OBJECT_CLASS (gtk_text_tag_table_parent_class)->finalize (object);
}
static void
gtk_text_tag_table_buildable_interface_init (GtkBuildableIface *iface)
{
iface->add_child = gtk_text_tag_table_buildable_add_child;
}
static void
gtk_text_tag_table_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *type)
{
if (type && strcmp (type, "tag") == 0)
gtk_text_tag_table_add (GTK_TEXT_TAG_TABLE (buildable),
GTK_TEXT_TAG (child));
}
/**
* gtk_text_tag_table_add:
* @table: a #GtkTextTagTable
* @tag: a #GtkTextTag
*
* Add a tag to the table. The tag is assigned the highest priority
* in the table.
*
* @tag must not be in a tag table already, and may not have
* the same name as an already-added tag.
**/
void
gtk_text_tag_table_add (GtkTextTagTable *table,
GtkTextTag *tag)
{
GtkTextTagTablePrivate *priv;
guint size;
g_return_if_fail (GTK_IS_TEXT_TAG_TABLE (table));
g_return_if_fail (GTK_IS_TEXT_TAG (tag));
g_return_if_fail (tag->priv->table == NULL);
priv = table->priv;
if (tag->priv->name && g_hash_table_lookup (priv->hash, tag->priv->name))
{
g_warning ("A tag named '%s' is already in the tag table.",
tag->priv->name);
return;
}
g_object_ref (tag);
if (tag->priv->name)
g_hash_table_insert (priv->hash, tag->priv->name, tag);
else
{
priv->anonymous = g_slist_prepend (priv->anonymous, tag);
priv->anon_count++;
}
tag->priv->table = table;
/* We get the highest tag priority, as the most-recently-added
tag. Note that we do NOT use gtk_text_tag_set_priority,
as it assumes the tag is already in the table. */
size = gtk_text_tag_table_get_size (table);
g_assert (size > 0);
tag->priv->priority = size - 1;
g_signal_emit (table, signals[TAG_ADDED], 0, tag);
}
/**
* gtk_text_tag_table_lookup:
* @table: a #GtkTextTagTable
* @name: name of a tag
*
* Look up a named tag.
*
* Return value: (transfer none): The tag, or %NULL if none by that name is in the table.
**/
GtkTextTag*
gtk_text_tag_table_lookup (GtkTextTagTable *table,
const gchar *name)
{
GtkTextTagTablePrivate *priv;
g_return_val_if_fail (GTK_IS_TEXT_TAG_TABLE (table), NULL);
g_return_val_if_fail (name != NULL, NULL);
priv = table->priv;
return g_hash_table_lookup (priv->hash, name);
}
/**
* gtk_text_tag_table_remove:
* @table: a #GtkTextTagTable
* @tag: a #GtkTextTag
*
* Remove a tag from the table. This will remove the table's
* reference to the tag, so be careful - the tag will end
* up destroyed if you don't have a reference to it.
**/
void
gtk_text_tag_table_remove (GtkTextTagTable *table,
GtkTextTag *tag)
{
GtkTextTagTablePrivate *priv;
GSList *l;
g_return_if_fail (GTK_IS_TEXT_TAG_TABLE (table));
g_return_if_fail (GTK_IS_TEXT_TAG (tag));
g_return_if_fail (tag->priv->table == table);
priv = table->priv;
/* Our little bad hack to be sure buffers don't still have the tag
* applied to text in the buffer
*/
for (l = priv->buffers; l != NULL; l = l->next)
_gtk_text_buffer_notify_will_remove_tag (GTK_TEXT_BUFFER (l->data),
tag);
/* Set ourselves to the highest priority; this means
when we're removed, there won't be any gaps in the
priorities of the tags in the table. */
gtk_text_tag_set_priority (tag, gtk_text_tag_table_get_size (table) - 1);
tag->priv->table = NULL;
if (tag->priv->name)
g_hash_table_remove (priv->hash, tag->priv->name);
else
{
priv->anonymous = g_slist_remove (priv->anonymous, tag);
priv->anon_count--;
}
g_signal_emit (table, signals[TAG_REMOVED], 0, tag);
g_object_unref (tag);
}
struct ForeachData
{
GtkTextTagTableForeach func;
gpointer data;
};
static void
hash_foreach (gpointer key, gpointer value, gpointer data)
{
struct ForeachData *fd = data;
g_return_if_fail (GTK_IS_TEXT_TAG (value));
(* fd->func) (value, fd->data);
}
static void
list_foreach (gpointer data, gpointer user_data)
{
struct ForeachData *fd = user_data;
g_return_if_fail (GTK_IS_TEXT_TAG (data));
(* fd->func) (data, fd->data);
}
/**
* gtk_text_tag_table_foreach:
* @table: a #GtkTextTagTable
* @func: (scope call): a function to call on each tag
* @data: user data
*
* Calls @func on each tag in @table, with user data @data.
* Note that the table may not be modified while iterating
* over it (you can't add/remove tags).
**/
void
gtk_text_tag_table_foreach (GtkTextTagTable *table,
GtkTextTagTableForeach func,
gpointer data)
{
GtkTextTagTablePrivate *priv;
struct ForeachData d;
g_return_if_fail (GTK_IS_TEXT_TAG_TABLE (table));
g_return_if_fail (func != NULL);
priv = table->priv;
d.func = func;
d.data = data;
g_hash_table_foreach (priv->hash, hash_foreach, &d);
g_slist_foreach (priv->anonymous, list_foreach, &d);
}
/**
* gtk_text_tag_table_get_size:
* @table: a #GtkTextTagTable
*
* Returns the size of the table (number of tags)
*
* Return value: number of tags in @table
**/
gint
gtk_text_tag_table_get_size (GtkTextTagTable *table)
{
GtkTextTagTablePrivate *priv;
g_return_val_if_fail (GTK_IS_TEXT_TAG_TABLE (table), 0);
priv = table->priv;
return g_hash_table_size (priv->hash) + priv->anon_count;
}
void
_gtk_text_tag_table_add_buffer (GtkTextTagTable *table,
gpointer buffer)
{
GtkTextTagTablePrivate *priv = table->priv;
priv->buffers = g_slist_prepend (priv->buffers, buffer);
}
static void
foreach_remove_tag (GtkTextTag *tag, gpointer data)
{
GtkTextBuffer *buffer;
buffer = GTK_TEXT_BUFFER (data);
_gtk_text_buffer_notify_will_remove_tag (buffer, tag);
}
void
_gtk_text_tag_table_remove_buffer (GtkTextTagTable *table,
gpointer buffer)
{
GtkTextTagTablePrivate *priv = table->priv;
gtk_text_tag_table_foreach (table, foreach_remove_tag, buffer);
priv->buffers = g_slist_remove (priv->buffers, buffer);
}
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