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gtk/gtk/gtktextbufferrichtext.c

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/* gtkrichtext.c
*
* Copyright (C) 2006 Imendio AB
* Contact: Michael Natterer <mitch@imendio.com>
*
* This library 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 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include "gtktextbufferrichtext.h"
#include "gtktextbufferserialize.h"
#include "gtkintl.h"
typedef struct
{
gchar *mime_type;
gboolean can_create_tags;
GdkAtom atom;
gpointer function;
gpointer user_data;
GDestroyNotify user_data_destroy;
} GtkRichTextFormat;
static GList * register_format (GList *formats,
const gchar *mime_type,
gpointer function,
gpointer user_data,
GDestroyNotify user_data_destroy,
GdkAtom *atom);
static GList * unregister_format (GList *formats,
GdkAtom atom);
static GdkAtom * get_formats (GList *formats,
gint *n_formats);
static void free_format (GtkRichTextFormat *format);
static void free_format_list (GList *formats);
static GQuark serialize_quark (void);
static GQuark deserialize_quark (void);
/**
* gtk_text_buffer_register_serialize_format:
* @buffer: a #GtkTextBuffer
* @mime_type: the format's mime-type
* @function: the serialize function to register
* @user_data: @function's user_data
* @user_data_destroy: a function to call when @user_data is no longer needed
*
* This function registers a rich text serialization @function along with
* its @mime_type with the passed @buffer.
*
* Return value: (transfer none): the #GdkAtom that corresponds to the
* newly registered format's mime-type.
*
* Since: 2.10
**/
GdkAtom
gtk_text_buffer_register_serialize_format (GtkTextBuffer *buffer,
const gchar *mime_type,
GtkTextBufferSerializeFunc function,
gpointer user_data,
GDestroyNotify user_data_destroy)
{
GList *formats;
GdkAtom atom;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), GDK_NONE);
g_return_val_if_fail (mime_type != NULL && *mime_type != '\0', GDK_NONE);
g_return_val_if_fail (function != NULL, GDK_NONE);
formats = g_object_steal_qdata (G_OBJECT (buffer), serialize_quark ());
formats = register_format (formats, mime_type,
(gpointer) function,
user_data, user_data_destroy,
&atom);
g_object_set_qdata_full (G_OBJECT (buffer), serialize_quark (),
formats, (GDestroyNotify) free_format_list);
g_object_notify (G_OBJECT (buffer), "copy-target-list");
return atom;
}
/**
* gtk_text_buffer_register_serialize_tagset:
* @buffer: a #GtkTextBuffer
* @tagset_name: (allow-none): an optional tagset name, on %NULL
*
* This function registers GTK+'s internal rich text serialization
* format with the passed @buffer. The internal format does not comply
* to any standard rich text format and only works between #GtkTextBuffer
* instances. It is capable of serializing all of a text buffer's tags
* and embedded pixbufs.
*
* This function is just a wrapper around
* gtk_text_buffer_register_serialize_format(). The mime type used
* for registering is "application/x-gtk-text-buffer-rich-text", or
* "application/x-gtk-text-buffer-rich-text;format=@tagset_name" if a
* @tagset_name was passed.
*
* The @tagset_name can be used to restrict the transfer of rich text
* to buffers with compatible sets of tags, in order to avoid unknown
* tags from being pasted. It is probably the common case to pass an
* identifier != %NULL here, since the %NULL tagset requires the
* receiving buffer to deal with with pasting of arbitrary tags.
*
* Return value: (transfer none): the #GdkAtom that corresponds to the
* newly registered format's mime-type.
*
* Since: 2.10
**/
GdkAtom
gtk_text_buffer_register_serialize_tagset (GtkTextBuffer *buffer,
const gchar *tagset_name)
{
gchar *mime_type = "application/x-gtk-text-buffer-rich-text";
GdkAtom format;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), GDK_NONE);
g_return_val_if_fail (tagset_name == NULL || *tagset_name != '\0', GDK_NONE);
if (tagset_name)
mime_type =
g_strdup_printf ("application/x-gtk-text-buffer-rich-text;format=%s",
tagset_name);
format = gtk_text_buffer_register_serialize_format (buffer, mime_type,
_gtk_text_buffer_serialize_rich_text,
NULL, NULL);
if (tagset_name)
g_free (mime_type);
return format;
}
/**
* gtk_text_buffer_register_deserialize_format:
* @buffer: a #GtkTextBuffer
* @mime_type: the format's mime-type
* @function: the deserialize function to register
* @user_data: @function's user_data
* @user_data_destroy: a function to call when @user_data is no longer needed
*
* This function registers a rich text deserialization @function along with
* its @mime_type with the passed @buffer.
*
* Return value: (transfer none): the #GdkAtom that corresponds to the
* newly registered format's mime-type.
*
* Since: 2.10
**/
GdkAtom
gtk_text_buffer_register_deserialize_format (GtkTextBuffer *buffer,
const gchar *mime_type,
GtkTextBufferDeserializeFunc function,
gpointer user_data,
GDestroyNotify user_data_destroy)
{
GList *formats;
GdkAtom atom;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), GDK_NONE);
g_return_val_if_fail (mime_type != NULL && *mime_type != '\0', GDK_NONE);
g_return_val_if_fail (function != NULL, GDK_NONE);
formats = g_object_steal_qdata (G_OBJECT (buffer), deserialize_quark ());
formats = register_format (formats, mime_type,
(gpointer) function,
user_data, user_data_destroy,
&atom);
g_object_set_qdata_full (G_OBJECT (buffer), deserialize_quark (),
formats, (GDestroyNotify) free_format_list);
g_object_notify (G_OBJECT (buffer), "paste-target-list");
return atom;
}
/**
* gtk_text_buffer_register_deserialize_tagset:
* @buffer: a #GtkTextBuffer
* @tagset_name: (allow-none): an optional tagset name, on %NULL
*
* This function registers GTK+'s internal rich text serialization
* format with the passed @buffer. See
* gtk_text_buffer_register_serialize_tagset() for details.
*
* Return value: (transfer none): the #GdkAtom that corresponds to the
* newly registered format's mime-type.
*
* Since: 2.10
**/
GdkAtom
gtk_text_buffer_register_deserialize_tagset (GtkTextBuffer *buffer,
const gchar *tagset_name)
{
gchar *mime_type = "application/x-gtk-text-buffer-rich-text";
GdkAtom format;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), GDK_NONE);
g_return_val_if_fail (tagset_name == NULL || *tagset_name != '\0', GDK_NONE);
if (tagset_name)
mime_type =
g_strdup_printf ("application/x-gtk-text-buffer-rich-text;format=%s",
tagset_name);
format = gtk_text_buffer_register_deserialize_format (buffer, mime_type,
_gtk_text_buffer_deserialize_rich_text,
NULL, NULL);
if (tagset_name)
g_free (mime_type);
return format;
}
/**
* gtk_text_buffer_unregister_serialize_format:
* @buffer: a #GtkTextBuffer
* @format: a #GdkAtom representing a registered rich text format.
*
* This function unregisters a rich text format that was previously
* registered using gtk_text_buffer_register_serialize_format() or
* gtk_text_buffer_register_serialize_tagset()
*
* Since: 2.10
**/
void
gtk_text_buffer_unregister_serialize_format (GtkTextBuffer *buffer,
GdkAtom format)
{
GList *formats;
g_return_if_fail (GTK_IS_TEXT_BUFFER (buffer));
g_return_if_fail (format != GDK_NONE);
formats = g_object_steal_qdata (G_OBJECT (buffer), serialize_quark ());
formats = unregister_format (formats, format);
g_object_set_qdata_full (G_OBJECT (buffer), serialize_quark (),
formats, (GDestroyNotify) free_format_list);
g_object_notify (G_OBJECT (buffer), "copy-target-list");
}
/**
* gtk_text_buffer_unregister_deserialize_format:
* @buffer: a #GtkTextBuffer
* @format: a #GdkAtom representing a registered rich text format.
*
* This function unregisters a rich text format that was previously
* registered using gtk_text_buffer_register_deserialize_format() or
* gtk_text_buffer_register_deserialize_tagset().
*
* Since: 2.10
**/
void
gtk_text_buffer_unregister_deserialize_format (GtkTextBuffer *buffer,
GdkAtom format)
{
GList *formats;
g_return_if_fail (GTK_IS_TEXT_BUFFER (buffer));
g_return_if_fail (format != GDK_NONE);
formats = g_object_steal_qdata (G_OBJECT (buffer), deserialize_quark ());
formats = unregister_format (formats, format);
g_object_set_qdata_full (G_OBJECT (buffer), deserialize_quark (),
formats, (GDestroyNotify) free_format_list);
g_object_notify (G_OBJECT (buffer), "paste-target-list");
}
/**
* gtk_text_buffer_deserialize_set_can_create_tags:
* @buffer: a #GtkTextBuffer
* @format: a #GdkAtom representing a registered rich text format
* @can_create_tags: whether deserializing this format may create tags
*
* Use this function to allow a rich text deserialization function to
* create new tags in the receiving buffer. Note that using this
* function is almost always a bad idea, because the rich text
* functions you register should know how to map the rich text format
* they handler to your text buffers set of tags.
*
* The ability of creating new (arbitrary!) tags in the receiving buffer
* is meant for special rich text formats like the internal one that
* is registered using gtk_text_buffer_register_deserialize_tagset(),
* because that format is essentially a dump of the internal structure
* of the source buffer, including its tag names.
*
* You should allow creation of tags only if you know what you are
* doing, e.g. if you defined a tagset name for your application
* suite's text buffers and you know that it's fine to receive new
* tags from these buffers, because you know that your application can
* handle the newly created tags.
*
* Since: 2.10
**/
void
gtk_text_buffer_deserialize_set_can_create_tags (GtkTextBuffer *buffer,
GdkAtom format,
gboolean can_create_tags)
{
GList *formats;
GList *list;
gchar *format_name;
g_return_if_fail (GTK_IS_TEXT_BUFFER (buffer));
g_return_if_fail (format != GDK_NONE);
formats = g_object_get_qdata (G_OBJECT (buffer), deserialize_quark ());
for (list = formats; list; list = g_list_next (list))
{
GtkRichTextFormat *fmt = list->data;
if (fmt->atom == format)
{
fmt->can_create_tags = can_create_tags ? TRUE : FALSE;
return;
}
}
format_name = gdk_atom_name (format);
g_warning ("%s: \"%s\" is not registered as deserializable format "
"with text buffer %p",
G_STRFUNC, format_name ? format_name : "not a GdkAtom", buffer);
g_free (format_name);
}
/**
* gtk_text_buffer_deserialize_get_can_create_tags:
* @buffer: a #GtkTextBuffer
* @format: a #GdkAtom representing a registered rich text format
*
* This functions returns the value set with
* gtk_text_buffer_deserialize_set_can_create_tags()
*
* Return value: whether deserializing this format may create tags
*
* Since: 2.10
**/
gboolean
gtk_text_buffer_deserialize_get_can_create_tags (GtkTextBuffer *buffer,
GdkAtom format)
{
GList *formats;
GList *list;
gchar *format_name;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), FALSE);
g_return_val_if_fail (format != GDK_NONE, FALSE);
formats = g_object_get_qdata (G_OBJECT (buffer), deserialize_quark ());
for (list = formats; list; list = g_list_next (list))
{
GtkRichTextFormat *fmt = list->data;
if (fmt->atom == format)
{
return fmt->can_create_tags;
}
}
format_name = gdk_atom_name (format);
g_warning ("%s: \"%s\" is not registered as deserializable format "
"with text buffer %p",
G_STRFUNC, format_name ? format_name : "not a GdkAtom", buffer);
g_free (format_name);
return FALSE;
}
/**
* gtk_text_buffer_get_serialize_formats:
* @buffer: a #GtkTextBuffer
* @n_formats: (out): return location for the number of formats
*
* This function returns the rich text serialize formats registered
* with @buffer using gtk_text_buffer_register_serialize_format() or
* gtk_text_buffer_register_serialize_tagset()
*
* Return value: (array length=n_formats) (transfer container): an array of
* #GdkAtom<!-- -->s representing the registered formats.
*
* Since: 2.10
**/
GdkAtom *
gtk_text_buffer_get_serialize_formats (GtkTextBuffer *buffer,
gint *n_formats)
{
GList *formats;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), NULL);
g_return_val_if_fail (n_formats != NULL, NULL);
formats = g_object_get_qdata (G_OBJECT (buffer), serialize_quark ());
return get_formats (formats, n_formats);
}
/**
* gtk_text_buffer_get_deserialize_formats:
* @buffer: a #GtkTextBuffer
* @n_formats: (out): return location for the number of formats
*
* This function returns the rich text deserialize formats registered
* with @buffer using gtk_text_buffer_register_deserialize_format() or
* gtk_text_buffer_register_deserialize_tagset()
*
* Return value: (array length=n_formats) (transfer container): an array of
* #GdkAtom<!-- -->s representing the registered formats.
*
* Since: 2.10
**/
GdkAtom *
gtk_text_buffer_get_deserialize_formats (GtkTextBuffer *buffer,
gint *n_formats)
{
GList *formats;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), NULL);
g_return_val_if_fail (n_formats != NULL, NULL);
formats = g_object_get_qdata (G_OBJECT (buffer), deserialize_quark ());
return get_formats (formats, n_formats);
}
/**
* gtk_text_buffer_serialize:
* @register_buffer: the #GtkTextBuffer @format is registered with
* @content_buffer: the #GtkTextBuffer to serialize
* @format: the rich text format to use for serializing
* @start: start of block of text to serialize
* @end: end of block of test to serialize
* @length: (out): return location for the length of the serialized data
*
* This function serializes the portion of text between @start
* and @end in the rich text format represented by @format.
*
* @format<!-- -->s to be used must be registered using
* gtk_text_buffer_register_serialize_format() or
* gtk_text_buffer_register_serialize_tagset() beforehand.
*
* Return value: (array length=length) (transfer full): the serialized
* data, encoded as @format
*
* Since: 2.10
**/
guint8 *
gtk_text_buffer_serialize (GtkTextBuffer *register_buffer,
GtkTextBuffer *content_buffer,
GdkAtom format,
const GtkTextIter *start,
const GtkTextIter *end,
gsize *length)
{
GList *formats;
GList *list;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (register_buffer), NULL);
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (content_buffer), NULL);
g_return_val_if_fail (format != GDK_NONE, NULL);
g_return_val_if_fail (start != NULL, NULL);
g_return_val_if_fail (end != NULL, NULL);
g_return_val_if_fail (length != NULL, NULL);
*length = 0;
formats = g_object_get_qdata (G_OBJECT (register_buffer),
serialize_quark ());
for (list = formats; list; list = g_list_next (list))
{
GtkRichTextFormat *fmt = list->data;
if (fmt->atom == format)
{
GtkTextBufferSerializeFunc function = fmt->function;
return function (register_buffer, content_buffer,
start, end, length, fmt->user_data);
}
}
return NULL;
}
/**
* gtk_text_buffer_deserialize:
* @register_buffer: the #GtkTextBuffer @format is registered with
* @content_buffer: the #GtkTextBuffer to deserialize into
* @format: the rich text format to use for deserializing
* @iter: insertion point for the deserialized text
* @data: (array length=length): data to deserialize
* @length: length of @data
* @error: return location for a #GError
*
* This function deserializes rich text in format @format and inserts
* it at @iter.
*
* @format<!-- -->s to be used must be registered using
* gtk_text_buffer_register_deserialize_format() or
* gtk_text_buffer_register_deserialize_tagset() beforehand.
*
* Return value: %TRUE on success, %FALSE otherwise.
*
* Since: 2.10
**/
gboolean
gtk_text_buffer_deserialize (GtkTextBuffer *register_buffer,
GtkTextBuffer *content_buffer,
GdkAtom format,
GtkTextIter *iter,
const guint8 *data,
gsize length,
GError **error)
{
GList *formats;
GList *list;
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (register_buffer), FALSE);
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (content_buffer), FALSE);
g_return_val_if_fail (format != GDK_NONE, FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (length > 0, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
formats = g_object_get_qdata (G_OBJECT (register_buffer),
deserialize_quark ());
for (list = formats; list; list = g_list_next (list))
{
GtkRichTextFormat *fmt = list->data;
if (fmt->atom == format)
{
GtkTextBufferDeserializeFunc function = fmt->function;
gboolean success;
GSList *split_tags;
GSList *list;
GtkTextMark *left_end = NULL;
GtkTextMark *right_start = NULL;
GSList *left_start_list = NULL;
GSList *right_end_list = NULL;
/* We don't want the tags that are effective at the insertion
* point to affect the pasted text, therefore we remove and
* remember them, so they can be re-applied left and right of
* the inserted text after pasting
*/
split_tags = gtk_text_iter_get_tags (iter);
list = split_tags;
while (list)
{
GtkTextTag *tag = list->data;
list = g_slist_next (list);
/* If a tag begins at the insertion point, ignore it
* because it doesn't affect the pasted text
*/
if (gtk_text_iter_begins_tag (iter, tag))
split_tags = g_slist_remove (split_tags, tag);
}
if (split_tags)
{
/* Need to remember text marks, because text iters
* don't survive pasting
*/
left_end = gtk_text_buffer_create_mark (content_buffer,
NULL, iter, TRUE);
right_start = gtk_text_buffer_create_mark (content_buffer,
NULL, iter, FALSE);
for (list = split_tags; list; list = g_slist_next (list))
{
GtkTextTag *tag = list->data;
GtkTextIter *backward_toggle = gtk_text_iter_copy (iter);
GtkTextIter *forward_toggle = gtk_text_iter_copy (iter);
GtkTextMark *left_start = NULL;
GtkTextMark *right_end = NULL;
gtk_text_iter_backward_to_tag_toggle (backward_toggle, tag);
left_start = gtk_text_buffer_create_mark (content_buffer,
NULL,
backward_toggle,
FALSE);
gtk_text_iter_forward_to_tag_toggle (forward_toggle, tag);
right_end = gtk_text_buffer_create_mark (content_buffer,
NULL,
forward_toggle,
TRUE);
left_start_list = g_slist_prepend (left_start_list, left_start);
right_end_list = g_slist_prepend (right_end_list, right_end);
gtk_text_buffer_remove_tag (content_buffer, tag,
backward_toggle,
forward_toggle);
gtk_text_iter_free (forward_toggle);
gtk_text_iter_free (backward_toggle);
}
left_start_list = g_slist_reverse (left_start_list);
right_end_list = g_slist_reverse (right_end_list);
}
success = function (register_buffer, content_buffer,
iter, data, length,
fmt->can_create_tags,
fmt->user_data,
error);
if (!success && error != NULL && *error == NULL)
g_set_error (error, 0, 0,
_("Unknown error when trying to deserialize %s"),
gdk_atom_name (format));
if (split_tags)
{
GSList *left_list;
GSList *right_list;
GtkTextIter left_e;
GtkTextIter right_s;
/* Turn the remembered marks back into iters so they
* can by used to re-apply the remembered tags
*/
gtk_text_buffer_get_iter_at_mark (content_buffer,
&left_e, left_end);
gtk_text_buffer_get_iter_at_mark (content_buffer,
&right_s, right_start);
for (list = split_tags,
left_list = left_start_list,
right_list = right_end_list;
list && left_list && right_list;
list = g_slist_next (list),
left_list = g_slist_next (left_list),
right_list = g_slist_next (right_list))
{
GtkTextTag *tag = list->data;
GtkTextMark *left_start = left_list->data;
GtkTextMark *right_end = right_list->data;
GtkTextIter left_s;
GtkTextIter right_e;
gtk_text_buffer_get_iter_at_mark (content_buffer,
&left_s, left_start);
gtk_text_buffer_get_iter_at_mark (content_buffer,
&right_e, right_end);
gtk_text_buffer_apply_tag (content_buffer, tag,
&left_s, &left_e);
gtk_text_buffer_apply_tag (content_buffer, tag,
&right_s, &right_e);
gtk_text_buffer_delete_mark (content_buffer, left_start);
gtk_text_buffer_delete_mark (content_buffer, right_end);
}
gtk_text_buffer_delete_mark (content_buffer, left_end);
gtk_text_buffer_delete_mark (content_buffer, right_start);
g_slist_free (split_tags);
g_slist_free (left_start_list);
g_slist_free (right_end_list);
}
return success;
}
}
g_set_error (error, 0, 0,
_("No deserialize function found for format %s"),
gdk_atom_name (format));
return FALSE;
}
/* private functions */
static GList *
register_format (GList *formats,
const gchar *mime_type,
gpointer function,
gpointer user_data,
GDestroyNotify user_data_destroy,
GdkAtom *atom)
{
GtkRichTextFormat *format;
*atom = gdk_atom_intern (mime_type, FALSE);
formats = unregister_format (formats, *atom);
format = g_new0 (GtkRichTextFormat, 1);
format->mime_type = g_strdup (mime_type);
format->can_create_tags = FALSE;
format->atom = *atom;
format->function = function;
format->user_data = user_data;
format->user_data_destroy = user_data_destroy;
return g_list_append (formats, format);
}
static GList *
unregister_format (GList *formats,
GdkAtom atom)
{
GList *list;
for (list = formats; list; list = g_list_next (list))
{
GtkRichTextFormat *format = list->data;
if (format->atom == atom)
{
free_format (format);
return g_list_delete_link (formats, list);
}
}
return formats;
}
static GdkAtom *
get_formats (GList *formats,
gint *n_formats)
{
GdkAtom *array;
GList *list;
gint i;
*n_formats = g_list_length (formats);
array = g_new0 (GdkAtom, *n_formats);
for (list = formats, i = 0; list; list = g_list_next (list), i++)
{
GtkRichTextFormat *format = list->data;
array[i] = format->atom;
}
return array;
}
static void
free_format (GtkRichTextFormat *format)
{
if (format->user_data_destroy)
format->user_data_destroy (format->user_data);
g_free (format->mime_type);
g_free (format);
}
static void
free_format_list (GList *formats)
{
g_list_free_full (formats, (GDestroyNotify) free_format);
}
static GQuark
serialize_quark (void)
{
static GQuark quark = 0;
if (! quark)
quark = g_quark_from_static_string ("gtk-text-buffer-serialize-formats");
return quark;
}
static GQuark
deserialize_quark (void)
{
static GQuark quark = 0;
if (! quark)
quark = g_quark_from_static_string ("gtk-text-buffer-deserialize-formats");
return quark;
}
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