glib/gio/gicon.c
Sébastien Wilmet 3bf4a720c3 gio/: LGPLv2+ -> LGPLv2.1+
Sub-directories inside gio/ already processed in a previous commit:
- fam/
- gdbus-2.0/ (which contains only codegen/)
- gvdb/
- inotify/
- tests/
- win32/
- xdgmime/

Other sub-directories inside gio/:
- completion/: no license headers
- kqueue/: not LGPL, BSD-style license

https://bugzilla.gnome.org/show_bug.cgi?id=776504
2017-05-29 19:53:34 +02:00

683 lines
18 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* 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 2.1 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/>.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "gicon.h"
#include "gthemedicon.h"
#include "gfileicon.h"
#include "gemblemedicon.h"
#include "gbytesicon.h"
#include "gfile.h"
#include "gioerror.h"
#include "gioenumtypes.h"
#include "gvfs.h"
#include "glibintl.h"
/* There versioning of this is implicit, version 1 would be ".1 " */
#define G_ICON_SERIALIZATION_MAGIC0 ". "
/**
* SECTION:gicon
* @short_description: Interface for icons
* @include: gio/gio.h
*
* #GIcon is a very minimal interface for icons. It provides functions
* for checking the equality of two icons, hashing of icons and
* serializing an icon to and from strings.
*
* #GIcon does not provide the actual pixmap for the icon as this is out
* of GIO's scope, however implementations of #GIcon may contain the name
* of an icon (see #GThemedIcon), or the path to an icon (see #GLoadableIcon).
*
* To obtain a hash of a #GIcon, see g_icon_hash().
*
* To check if two #GIcons are equal, see g_icon_equal().
*
* For serializing a #GIcon, use g_icon_serialize() and
* g_icon_deserialize().
*
* If you want to consume #GIcon (for example, in a toolkit) you must
* be prepared to handle at least the three following cases:
* #GLoadableIcon, #GThemedIcon and #GEmblemedIcon. It may also make
* sense to have fast-paths for other cases (like handling #GdkPixbuf
* directly, for example) but all compliant #GIcon implementations
* outside of GIO must implement #GLoadableIcon.
*
* If your application or library provides one or more #GIcon
* implementations you need to ensure that your new implementation also
* implements #GLoadableIcon. Additionally, you must provide an
* implementation of g_icon_serialize() that gives a result that is
* understood by g_icon_deserialize(), yielding one of the built-in icon
* types.
**/
typedef GIconIface GIconInterface;
G_DEFINE_INTERFACE(GIcon, g_icon, G_TYPE_OBJECT)
static void
g_icon_default_init (GIconInterface *iface)
{
}
/**
* g_icon_hash:
* @icon: (not nullable): #gconstpointer to an icon object.
*
* Gets a hash for an icon.
*
* Virtual: hash
* Returns: a #guint containing a hash for the @icon, suitable for
* use in a #GHashTable or similar data structure.
**/
guint
g_icon_hash (gconstpointer icon)
{
GIconIface *iface;
g_return_val_if_fail (G_IS_ICON (icon), 0);
iface = G_ICON_GET_IFACE (icon);
return (* iface->hash) ((GIcon *)icon);
}
/**
* g_icon_equal:
* @icon1: (nullable): pointer to the first #GIcon.
* @icon2: (nullable): pointer to the second #GIcon.
*
* Checks if two icons are equal.
*
* Returns: %TRUE if @icon1 is equal to @icon2. %FALSE otherwise.
**/
gboolean
g_icon_equal (GIcon *icon1,
GIcon *icon2)
{
GIconIface *iface;
if (icon1 == NULL && icon2 == NULL)
return TRUE;
if (icon1 == NULL || icon2 == NULL)
return FALSE;
if (G_TYPE_FROM_INSTANCE (icon1) != G_TYPE_FROM_INSTANCE (icon2))
return FALSE;
iface = G_ICON_GET_IFACE (icon1);
return (* iface->equal) (icon1, icon2);
}
static gboolean
g_icon_to_string_tokenized (GIcon *icon, GString *s)
{
GPtrArray *tokens;
gint version;
GIconIface *icon_iface;
int i;
g_return_val_if_fail (icon != NULL, FALSE);
g_return_val_if_fail (G_IS_ICON (icon), FALSE);
icon_iface = G_ICON_GET_IFACE (icon);
if (icon_iface->to_tokens == NULL)
return FALSE;
tokens = g_ptr_array_new ();
if (!icon_iface->to_tokens (icon, tokens, &version))
{
g_ptr_array_free (tokens, TRUE);
return FALSE;
}
/* format: TypeName[.Version] <token_0> .. <token_N-1>
version 0 is implicit and can be omitted
all the tokens are url escaped to ensure they have no spaces in them */
g_string_append (s, g_type_name_from_instance ((GTypeInstance *)icon));
if (version != 0)
g_string_append_printf (s, ".%d", version);
for (i = 0; i < tokens->len; i++)
{
char *token;
token = g_ptr_array_index (tokens, i);
g_string_append_c (s, ' ');
/* We really only need to escape spaces here, so allow lots of otherwise reserved chars */
g_string_append_uri_escaped (s, token,
G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, TRUE);
g_free (token);
}
g_ptr_array_free (tokens, TRUE);
return TRUE;
}
/**
* g_icon_to_string:
* @icon: a #GIcon.
*
* Generates a textual representation of @icon that can be used for
* serialization such as when passing @icon to a different process or
* saving it to persistent storage. Use g_icon_new_for_string() to
* get @icon back from the returned string.
*
* The encoding of the returned string is proprietary to #GIcon except
* in the following two cases
*
* - If @icon is a #GFileIcon, the returned string is a native path
* (such as `/path/to/my icon.png`) without escaping
* if the #GFile for @icon is a native file. If the file is not
* native, the returned string is the result of g_file_get_uri()
* (such as `sftp://path/to/my%20icon.png`).
*
* - If @icon is a #GThemedIcon with exactly one name, the encoding is
* simply the name (such as `network-server`).
*
* Virtual: to_tokens
* Returns: (nullable): An allocated NUL-terminated UTF8 string or
* %NULL if @icon can't be serialized. Use g_free() to free.
*
* Since: 2.20
*/
gchar *
g_icon_to_string (GIcon *icon)
{
gchar *ret;
g_return_val_if_fail (icon != NULL, NULL);
g_return_val_if_fail (G_IS_ICON (icon), NULL);
ret = NULL;
if (G_IS_FILE_ICON (icon))
{
GFile *file;
file = g_file_icon_get_file (G_FILE_ICON (icon));
if (g_file_is_native (file))
{
ret = g_file_get_path (file);
if (!g_utf8_validate (ret, -1, NULL))
{
g_free (ret);
ret = NULL;
}
}
else
ret = g_file_get_uri (file);
}
else if (G_IS_THEMED_ICON (icon))
{
const char * const *names;
names = g_themed_icon_get_names (G_THEMED_ICON (icon));
if (names != NULL &&
names[0] != NULL &&
names[0][0] != '.' && /* Allowing icons starting with dot would break G_ICON_SERIALIZATION_MAGIC0 */
g_utf8_validate (names[0], -1, NULL) && /* Only return utf8 strings */
names[1] == NULL)
ret = g_strdup (names[0]);
}
if (ret == NULL)
{
GString *s;
s = g_string_new (G_ICON_SERIALIZATION_MAGIC0);
if (g_icon_to_string_tokenized (icon, s))
ret = g_string_free (s, FALSE);
else
g_string_free (s, TRUE);
}
return ret;
}
static GIcon *
g_icon_new_from_tokens (char **tokens,
GError **error)
{
GIcon *icon;
char *typename, *version_str;
GType type;
gpointer klass;
GIconIface *icon_iface;
gint version;
char *endp;
int num_tokens;
int i;
icon = NULL;
klass = NULL;
num_tokens = g_strv_length (tokens);
if (num_tokens < 1)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Wrong number of tokens (%d)"),
num_tokens);
goto out;
}
typename = tokens[0];
version_str = strchr (typename, '.');
if (version_str)
{
*version_str = 0;
version_str += 1;
}
type = g_type_from_name (tokens[0]);
if (type == 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("No type for class name %s"),
tokens[0]);
goto out;
}
if (!g_type_is_a (type, G_TYPE_ICON))
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Type %s does not implement the GIcon interface"),
tokens[0]);
goto out;
}
klass = g_type_class_ref (type);
if (klass == NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Type %s is not classed"),
tokens[0]);
goto out;
}
version = 0;
if (version_str)
{
version = strtol (version_str, &endp, 10);
if (endp == NULL || *endp != '\0')
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Malformed version number: %s"),
version_str);
goto out;
}
}
icon_iface = g_type_interface_peek (klass, G_TYPE_ICON);
g_assert (icon_iface != NULL);
if (icon_iface->from_tokens == NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Type %s does not implement from_tokens() on the GIcon interface"),
tokens[0]);
goto out;
}
for (i = 1; i < num_tokens; i++)
{
char *escaped;
escaped = tokens[i];
tokens[i] = g_uri_unescape_string (escaped, NULL);
g_free (escaped);
}
icon = icon_iface->from_tokens (tokens + 1, num_tokens - 1, version, error);
out:
if (klass != NULL)
g_type_class_unref (klass);
return icon;
}
static void
ensure_builtin_icon_types (void)
{
g_type_ensure (G_TYPE_THEMED_ICON);
g_type_ensure (G_TYPE_FILE_ICON);
g_type_ensure (G_TYPE_EMBLEMED_ICON);
g_type_ensure (G_TYPE_EMBLEM);
}
/* handles the 'simple' cases: GFileIcon and GThemedIcon */
static GIcon *
g_icon_new_for_string_simple (const gchar *str)
{
gchar *scheme;
GIcon *icon;
if (str[0] == '.')
return NULL;
/* handle special GFileIcon and GThemedIcon cases */
scheme = g_uri_parse_scheme (str);
if (scheme != NULL || str[0] == '/' || str[0] == G_DIR_SEPARATOR)
{
GFile *location;
location = g_file_new_for_commandline_arg (str);
icon = g_file_icon_new (location);
g_object_unref (location);
}
else
icon = g_themed_icon_new (str);
g_free (scheme);
return icon;
}
/**
* g_icon_new_for_string:
* @str: A string obtained via g_icon_to_string().
* @error: Return location for error.
*
* Generate a #GIcon instance from @str. This function can fail if
* @str is not valid - see g_icon_to_string() for discussion.
*
* If your application or library provides one or more #GIcon
* implementations you need to ensure that each #GType is registered
* with the type system prior to calling g_icon_new_for_string().
*
* Returns: (transfer full): An object implementing the #GIcon
* interface or %NULL if @error is set.
*
* Since: 2.20
**/
GIcon *
g_icon_new_for_string (const gchar *str,
GError **error)
{
GIcon *icon = NULL;
g_return_val_if_fail (str != NULL, NULL);
icon = g_icon_new_for_string_simple (str);
if (icon)
return icon;
ensure_builtin_icon_types ();
if (g_str_has_prefix (str, G_ICON_SERIALIZATION_MAGIC0))
{
gchar **tokens;
/* handle tokenized encoding */
tokens = g_strsplit (str + sizeof (G_ICON_SERIALIZATION_MAGIC0) - 1, " ", 0);
icon = g_icon_new_from_tokens (tokens, error);
g_strfreev (tokens);
}
else
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Cant handle the supplied version of the icon encoding"));
return icon;
}
static GEmblem *
g_icon_deserialize_emblem (GVariant *value)
{
GVariant *emblem_metadata;
GVariant *emblem_data;
const gchar *origin_nick;
GIcon *emblem_icon;
GEmblem *emblem;
g_variant_get (value, "(v@a{sv})", &emblem_data, &emblem_metadata);
emblem = NULL;
emblem_icon = g_icon_deserialize (emblem_data);
if (emblem_icon != NULL)
{
/* Check if we should create it with an origin. */
if (g_variant_lookup (emblem_metadata, "origin", "&s", &origin_nick))
{
GEnumClass *origin_class;
GEnumValue *origin_value;
origin_class = g_type_class_ref (G_TYPE_EMBLEM_ORIGIN);
origin_value = g_enum_get_value_by_nick (origin_class, origin_nick);
if (origin_value)
emblem = g_emblem_new_with_origin (emblem_icon, origin_value->value);
g_type_class_unref (origin_class);
}
/* We didn't create it with an origin, so do it without. */
if (emblem == NULL)
emblem = g_emblem_new (emblem_icon);
g_object_unref (emblem_icon);
}
g_variant_unref (emblem_metadata);
g_variant_unref (emblem_data);
return emblem;
}
static GIcon *
g_icon_deserialize_emblemed (GVariant *value)
{
GVariantIter *emblems;
GVariant *icon_data;
GIcon *main_icon;
GIcon *icon;
g_variant_get (value, "(va(va{sv}))", &icon_data, &emblems);
main_icon = g_icon_deserialize (icon_data);
if (main_icon)
{
GVariant *emblem_data;
icon = g_emblemed_icon_new (main_icon, NULL);
while ((emblem_data = g_variant_iter_next_value (emblems)))
{
GEmblem *emblem;
emblem = g_icon_deserialize_emblem (emblem_data);
if (emblem)
{
g_emblemed_icon_add_emblem (G_EMBLEMED_ICON (icon), emblem);
g_object_unref (emblem);
}
g_variant_unref (emblem_data);
}
g_object_unref (main_icon);
}
else
icon = NULL;
g_variant_iter_free (emblems);
g_variant_unref (icon_data);
return icon;
}
/**
* g_icon_deserialize:
* @value: a #GVariant created with g_icon_serialize()
*
* Deserializes a #GIcon previously serialized using g_icon_serialize().
*
* Returns: (transfer full): a #GIcon, or %NULL when deserialization fails.
*
* Since: 2.38
*/
GIcon *
g_icon_deserialize (GVariant *value)
{
const gchar *tag;
GVariant *val;
GIcon *icon;
g_return_val_if_fail (value != NULL, NULL);
g_return_val_if_fail (g_variant_is_of_type (value, G_VARIANT_TYPE_STRING) ||
g_variant_is_of_type (value, G_VARIANT_TYPE ("(sv)")), NULL);
/* Handle some special cases directly so that people can hard-code
* stuff into GMenuModel xml files without resorting to using GVariant
* text format to describe one of the explicitly-tagged possibilities
* below.
*/
if (g_variant_is_of_type (value, G_VARIANT_TYPE_STRING))
return g_icon_new_for_string_simple (g_variant_get_string (value, NULL));
/* Otherwise, use the tagged union format */
g_variant_get (value, "(&sv)", &tag, &val);
icon = NULL;
if (g_str_equal (tag, "file") && g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
{
GFile *file;
file = g_file_new_for_commandline_arg (g_variant_get_string (val, NULL));
icon = g_file_icon_new (file);
g_object_unref (file);
}
else if (g_str_equal (tag, "themed") && g_variant_is_of_type (val, G_VARIANT_TYPE_STRING_ARRAY))
{
const gchar **names;
gsize size;
names = g_variant_get_strv (val, &size);
icon = g_themed_icon_new_from_names ((gchar **) names, size);
g_free (names);
}
else if (g_str_equal (tag, "bytes") && g_variant_is_of_type (val, G_VARIANT_TYPE_BYTESTRING))
{
GBytes *bytes;
bytes = g_variant_get_data_as_bytes (val);
icon = g_bytes_icon_new (bytes);
g_bytes_unref (bytes);
}
else if (g_str_equal (tag, "emblem") && g_variant_is_of_type (val, G_VARIANT_TYPE ("(va{sv})")))
{
GEmblem *emblem;
emblem = g_icon_deserialize_emblem (val);
if (emblem)
icon = G_ICON (emblem);
}
else if (g_str_equal (tag, "emblemed") && g_variant_is_of_type (val, G_VARIANT_TYPE ("(va(va{sv}))")))
{
icon = g_icon_deserialize_emblemed (val);
}
else if (g_str_equal (tag, "gvfs"))
{
GVfsClass *class;
GVfs *vfs;
vfs = g_vfs_get_default ();
class = G_VFS_GET_CLASS (vfs);
if (class->deserialize_icon)
icon = (* class->deserialize_icon) (vfs, val);
}
g_variant_unref (val);
return icon;
}
/**
* g_icon_serialize:
* @icon: a #GIcon
*
* Serializes a #GIcon into a #GVariant. An equivalent #GIcon can be retrieved
* back by calling g_icon_deserialize() on the returned value.
* As serialization will avoid using raw icon data when possible, it only
* makes sense to transfer the #GVariant between processes on the same machine,
* (as opposed to over the network), and within the same file system namespace.
*
* Returns: (transfer full): a #GVariant, or %NULL when serialization fails.
*
* Since: 2.38
*/
GVariant *
g_icon_serialize (GIcon *icon)
{
GIconInterface *iface;
GVariant *result;
iface = G_ICON_GET_IFACE (icon);
if (!iface->serialize)
{
g_critical ("g_icon_serialize() on icon type '%s' is not implemented", G_OBJECT_TYPE_NAME (icon));
return NULL;
}
result = (* iface->serialize) (icon);
if (result)
{
g_variant_take_ref (result);
if (!g_variant_is_of_type (result, G_VARIANT_TYPE ("(sv)")))
{
g_critical ("g_icon_serialize() on icon type '%s' returned GVariant of type '%s' but it must return "
"one with type '(sv)'", G_OBJECT_TYPE_NAME (icon), g_variant_get_type_string (result));
g_variant_unref (result);
result = NULL;
}
}
return result;
}