/* GTK - The GIMP Toolkit
* gtkrecentfilter.h - Filter object for recently used resources
* Copyright (C) 2006, Emmanuele Bassi
*
* 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/>.
*/
/**
* SECTION:gtkrecentfilter
* @Short_Description: A filter for selecting a subset of recently used files
* @Title: GtkRecentFilter
*
* A #GtkRecentFilter can be used to restrict the files being shown
* in a #GtkRecentChooser. Files can be filtered based on their name
* (with gtk_recent_filter_add_pattern()), on their mime type (with
* gtk_file_filter_add_mime_type()), on the application that has
* registered them (with gtk_recent_filter_add_application()), or by
* a custom filter function (with gtk_recent_filter_add_custom()).
*
* Filtering by mime type handles aliasing and subclassing of mime
* types; e.g. a filter for text/plain also matches a file with mime
* type application/rtf, since application/rtf is a subclass of text/plain.
* Note that #GtkRecentFilter allows wildcards for the subtype of a
* mime type, so you can e.g. filter for image/\*.
*
* Normally, filters are used by adding them to a #GtkRecentChooser,
* see gtk_recent_chooser_add_filter(), but it is also possible to
* manually use a filter on a file with gtk_recent_filter_filter().
*
* Recently used files are supported since GTK+ 2.10.
*
* ## GtkRecentFilter as GtkBuildable
*
* The GtkRecentFilter implementation of the GtkBuildable interface
* supports adding rules using the <mime-types>, <patterns> and
* <applications> elements and listing the rules within. Specifying
* a <mime-type>, <pattern> or <application> has the same effect as
* calling gtk_recent_filter_add_mime_type(),
* gtk_recent_filter_add_pattern() or gtk_recent_filter_add_application().
*
* An example of a UI definition fragment specifying GtkRecentFilter rules:
* |[
* <object class="GtkRecentFilter">
* <mime-types>
* <mime-type>text/plain</mime-type>
* <mime-type>image/png</mime-type>
* </mime-types>
* <patterns>
* <pattern>*.txt</pattern>
* <pattern>*.png</pattern>
* </patterns>
* <applications>
* <application>gimp</application>
* <application>gedit</application>
* <application>glade</application>
* </applications>
* </object>
* ]|
*/
#include "config.h"
#include <string.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "gtkrecentfilter.h"
#include "gtkbuildable.h"
#include "gtkbuilderprivate.h"
#include "gtkintl.h"
#include "gtkprivate.h"
static void gtk_recent_filter_buildable_init (GtkBuildableIface *iface);
static gboolean gtk_recent_filter_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
GMarkupParser *parser,
gpointer *data);
static void gtk_recent_filter_buildable_custom_tag_end (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
gpointer *data);
typedef struct _GtkRecentFilterClass GtkRecentFilterClass;
typedef struct _FilterRule FilterRule;
typedef enum {
FILTER_RULE_URI,
FILTER_RULE_DISPLAY_NAME,
FILTER_RULE_MIME_TYPE,
FILTER_RULE_PIXBUF_FORMATS,
FILTER_RULE_APPLICATION,
FILTER_RULE_AGE,
FILTER_RULE_GROUP,
FILTER_RULE_CUSTOM
} FilterRuleType;
struct _GtkRecentFilter
{
GInitiallyUnowned parent_instance;
gchar *name;
GSList *rules;
GtkRecentFilterFlags needed;
};
struct _GtkRecentFilterClass
{
GInitiallyUnownedClass parent_class;
};
struct _FilterRule
{
FilterRuleType type;
GtkRecentFilterFlags needed;
union {
gchar *uri;
gchar *pattern;
gchar *mime_type;
GSList *pixbuf_formats;
gchar *application;
gchar *group;
gint age;
struct {
GtkRecentFilterFunc func;
gpointer data;
GDestroyNotify data_destroy;
} custom;
} u;
};
G_DEFINE_TYPE_WITH_CODE (GtkRecentFilter, gtk_recent_filter, G_TYPE_INITIALLY_UNOWNED,
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_recent_filter_buildable_init))
static void
filter_rule_free (FilterRule *rule)
{
switch (rule->type)
{
case FILTER_RULE_MIME_TYPE:
g_free (rule->u.mime_type);
break;
case FILTER_RULE_URI:
g_free (rule->u.uri);
break;
case FILTER_RULE_DISPLAY_NAME:
g_free (rule->u.pattern);
break;
case FILTER_RULE_PIXBUF_FORMATS:
g_slist_free (rule->u.pixbuf_formats);
break;
case FILTER_RULE_AGE:
break;
case FILTER_RULE_APPLICATION:
g_free (rule->u.application);
break;
case FILTER_RULE_GROUP:
g_free (rule->u.group);
break;
case FILTER_RULE_CUSTOM:
if (rule->u.custom.data_destroy)
rule->u.custom.data_destroy (rule->u.custom.data);
break;
default:
g_assert_not_reached ();
break;
}
g_free (rule);
}
static void
gtk_recent_filter_finalize (GObject *object)
{
GtkRecentFilter *filter = GTK_RECENT_FILTER (object);
g_free (filter->name);
g_slist_free_full (filter->rules, (GDestroyNotify) filter_rule_free);
G_OBJECT_CLASS (gtk_recent_filter_parent_class)->finalize (object);
}
static void
gtk_recent_filter_class_init (GtkRecentFilterClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = gtk_recent_filter_finalize;
}
static void
gtk_recent_filter_init (GtkRecentFilter *filter)
{
}
/*
* GtkBuildable implementation
*/
static void
gtk_recent_filter_buildable_init (GtkBuildableIface *iface)
{
iface->custom_tag_start = gtk_recent_filter_buildable_custom_tag_start;
iface->custom_tag_end = gtk_recent_filter_buildable_custom_tag_end;
}
typedef enum {
PARSE_MIME_TYPES,
PARSE_PATTERNS,
PARSE_APPLICATIONS
} ParserType;
typedef struct {
GtkRecentFilter *filter;
GtkBuilder *builder;
ParserType type;
GString *string;
gboolean parsing;
} SubParserData;
static void
parser_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **names,
const gchar **values,
gpointer user_data,
GError **error)
{
SubParserData *data = (SubParserData*)user_data;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_INVALID, NULL, NULL,
G_MARKUP_COLLECT_INVALID))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
if (strcmp (element_name, "mime-types") == 0 ||
strcmp (element_name, "patterns") == 0 ||
strcmp (element_name, "applications") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "object", error))
return;
}
else if (strcmp (element_name, "mime-type") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "mime-types", error))
return;
data->parsing = TRUE;
}
else if (strcmp (element_name, "pattern") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "patterns", error))
return;
data->parsing = TRUE;
}
else if (strcmp (element_name, "application") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "applications", error))
return;
data->parsing = TRUE;
}
else
{
_gtk_builder_error_unhandled_tag (data->builder, context,
"GtkRecentFilter", element_name,
error);
}
}
static void
parser_text_element (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
SubParserData *data = (SubParserData*)user_data;
if (data->parsing)
g_string_append_len (data->string, text, text_len);
}
static void
parser_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
SubParserData *data = (SubParserData*)user_data;
if (data->string)
{
switch (data->type)
{
case PARSE_MIME_TYPES:
gtk_recent_filter_add_mime_type (data->filter, data->string->str);
break;
case PARSE_PATTERNS:
gtk_recent_filter_add_pattern (data->filter, data->string->str);
break;
case PARSE_APPLICATIONS:
gtk_recent_filter_add_application (data->filter, data->string->str);
break;
default:
break;
}
}
g_string_set_size (data->string, 0);
data->parsing = FALSE;
}
static const GMarkupParser sub_parser =
{
parser_start_element,
parser_end_element,
parser_text_element,
};
static gboolean
gtk_recent_filter_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
GMarkupParser *parser,
gpointer *parser_data)
{
SubParserData *data = NULL;
if (strcmp (tagname, "mime-types") == 0)
{
data = g_slice_new0 (SubParserData);
data->string = g_string_new ("");
data->type = PARSE_MIME_TYPES;
data->filter = GTK_RECENT_FILTER (buildable);
data->builder = builder;
*parser = sub_parser;
*parser_data = data;
}
else if (strcmp (tagname, "patterns") == 0)
{
data = g_slice_new0 (SubParserData);
data->string = g_string_new ("");
data->type = PARSE_PATTERNS;
data->filter = GTK_RECENT_FILTER (buildable);
data->builder = builder;
*parser = sub_parser;
*parser_data = data;
}
else if (strcmp (tagname, "applications") == 0)
{
data = g_slice_new0 (SubParserData);
data->string = g_string_new ("");
data->type = PARSE_APPLICATIONS;
data->filter = GTK_RECENT_FILTER (buildable);
data->builder = builder;
*parser = sub_parser;
*parser_data = data;
}
return data != NULL;
}
static void
gtk_recent_filter_buildable_custom_tag_end (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
gpointer *parser_data)
{
if (strcmp (tagname, "mime-types") == 0 ||
strcmp (tagname, "patterns") == 0 ||
strcmp (tagname, "applications") == 0)
{
SubParserData *data = (SubParserData*)parser_data;
g_string_free (data->string, TRUE);
g_slice_free (SubParserData, data);
}
}
/*
* Public API
*/
/**
* gtk_recent_filter_new:
*
* Creates a new #GtkRecentFilter with no rules added to it.
* Such filter does not accept any recently used resources, so is not
* particularly useful until you add rules with
* gtk_recent_filter_add_pattern(), gtk_recent_filter_add_mime_type(),
* gtk_recent_filter_add_application(), gtk_recent_filter_add_age().
* To create a filter that accepts any recently used resource, use:
* |[<!-- language="C" -->
* GtkRecentFilter *filter = gtk_recent_filter_new ();
* gtk_recent_filter_add_pattern (filter, "*");
* ]|
*
* Returns: a new #GtkRecentFilter
*
* Since: 2.10
*/
GtkRecentFilter *
gtk_recent_filter_new (void)
{
return g_object_new (GTK_TYPE_RECENT_FILTER, NULL);
}
/**
* gtk_recent_filter_set_name:
* @filter: a #GtkRecentFilter
* @name: then human readable name of @filter
*
* Sets the human-readable name of the filter; this is the string
* that will be displayed in the recently used resources selector
* user interface if there is a selectable list of filters.
*
* Since: 2.10
*/
void
gtk_recent_filter_set_name (GtkRecentFilter *filter,
const gchar *name)
{
g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
g_free (filter->name);
if (name)
filter->name = g_strdup (name);
}
/**
* gtk_recent_filter_get_name:
* @filter: a #GtkRecentFilter
*
* Gets the human-readable name for the filter.
* See gtk_recent_filter_set_name().
*
* Returns: (nullable): the name of the filter, or %NULL. The returned string
* is owned by the filter object and should not be freed.
*
* Since: 2.10
*/
const gchar *
gtk_recent_filter_get_name (GtkRecentFilter *filter)
{
g_return_val_if_fail (GTK_IS_RECENT_FILTER (filter), NULL);
return filter->name;
}
/**
* gtk_recent_filter_get_needed:
* @filter: a #GtkRecentFilter
*
* Gets the fields that need to be filled in for the #GtkRecentFilterInfo
* passed to gtk_recent_filter_filter()
*
* This function will not typically be used by applications; it
* is intended principally for use in the implementation of
* #GtkRecentChooser.
*
* Returns: bitfield of flags indicating needed fields when
* calling gtk_recent_filter_filter()
*
* Since: 2.10
*/
GtkRecentFilterFlags
gtk_recent_filter_get_needed (GtkRecentFilter *filter)
{
return filter->needed;
}
static void
recent_filter_add_rule (GtkRecentFilter *filter,
FilterRule *rule)
{
filter->needed |= rule->needed;
filter->rules = g_slist_append (filter->rules, rule);
}
/**
* gtk_recent_filter_add_mime_type:
* @filter: a #GtkRecentFilter
* @mime_type: a MIME type
*
* Adds a rule that allows resources based on their registered MIME type.
*
* Since: 2.10
*/
void
gtk_recent_filter_add_mime_type (GtkRecentFilter *filter,
const gchar *mime_type)
{
FilterRule *rule;
g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
g_return_if_fail (mime_type != NULL);
rule = g_new0 (FilterRule, 1);
rule->type = FILTER_RULE_MIME_TYPE;
rule->needed = GTK_RECENT_FILTER_MIME_TYPE;
rule->u.mime_type = g_strdup (mime_type);
recent_filter_add_rule (filter, rule);
}
/**
* gtk_recent_filter_add_pattern:
* @filter: a #GtkRecentFilter
* @pattern: a file pattern
*
* Adds a rule that allows resources based on a pattern matching their
* display name.
*
* Since: 2.10
*/
void
gtk_recent_filter_add_pattern (GtkRecentFilter *filter,
const gchar *pattern)
{
FilterRule *rule;
g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
g_return_if_fail (pattern != NULL);
rule = g_new0 (FilterRule, 1);
rule->type = FILTER_RULE_DISPLAY_NAME;
rule->needed = GTK_RECENT_FILTER_DISPLAY_NAME;
rule->u.pattern = g_strdup (pattern);
recent_filter_add_rule (filter, rule);
}
/**
* gtk_recent_filter_add_pixbuf_formats:
* @filter: a #GtkRecentFilter
*
* Adds a rule allowing image files in the formats supported
* by GdkPixbuf.
*
* Since: 2.10
*/
void
gtk_recent_filter_add_pixbuf_formats (GtkRecentFilter *filter)
{
FilterRule *rule;
g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
rule = g_new0 (FilterRule, 1);
rule->type = FILTER_RULE_PIXBUF_FORMATS;
rule->needed = GTK_RECENT_FILTER_MIME_TYPE;
rule->u.pixbuf_formats = gdk_pixbuf_get_formats ();
recent_filter_add_rule (filter, rule);
}
/**
* gtk_recent_filter_add_application:
* @filter: a #GtkRecentFilter
* @application: an application name
*
* Adds a rule that allows resources based on the name of the application
* that has registered them.
*
* Since: 2.10
*/
void
gtk_recent_filter_add_application (GtkRecentFilter *filter,
const gchar *application)
{
FilterRule *rule;
g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
g_return_if_fail (application != NULL);
rule = g_new0 (FilterRule, 1);
rule->type = FILTER_RULE_APPLICATION;
rule->needed = GTK_RECENT_FILTER_APPLICATION;
rule->u.application = g_strdup (application);
recent_filter_add_rule (filter, rule);
}
/**
* gtk_recent_filter_add_group:
* @filter: a #GtkRecentFilter
* @group: a group name
*
* Adds a rule that allows resources based on the name of the group
* to which they belong
*
* Since: 2.10
*/
void
gtk_recent_filter_add_group (GtkRecentFilter *filter,
const gchar *group)
{
FilterRule *rule;
g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
g_return_if_fail (group != NULL);
rule = g_new0 (FilterRule, 1);
rule->type = FILTER_RULE_GROUP;
rule->needed = GTK_RECENT_FILTER_GROUP;
rule->u.group = g_strdup (group);
recent_filter_add_rule (filter, rule);
}
/**
* gtk_recent_filter_add_age:
* @filter: a #GtkRecentFilter
* @days: number of days
*
* Adds a rule that allows resources based on their age - that is, the number
* of days elapsed since they were last modified.
*
* Since: 2.10
*/
void
gtk_recent_filter_add_age (GtkRecentFilter *filter,
gint days)
{
FilterRule *rule;
g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
rule = g_new0 (FilterRule, 1);
rule->type = FILTER_RULE_AGE;
rule->needed = GTK_RECENT_FILTER_AGE;
rule->u.age = days;
recent_filter_add_rule (filter, rule);
}
/**
* gtk_recent_filter_add_custom:
* @filter: a #GtkRecentFilter
* @needed: bitfield of flags indicating the information that the custom
* filter function needs.
* @func: callback function; if the function returns %TRUE, then
* the file will be displayed.
* @data: data to pass to @func
* @data_destroy: function to call to free @data when it is no longer needed.
*
* Adds a rule to a filter that allows resources based on a custom callback
* function. The bitfield @needed which is passed in provides information
* about what sorts of information that the filter function needs;
* this allows GTK+ to avoid retrieving expensive information when
* it isn’t needed by the filter.
*
* Since: 2.10
**/
void
gtk_recent_filter_add_custom (GtkRecentFilter *filter,
GtkRecentFilterFlags needed,
GtkRecentFilterFunc func,
gpointer data,
GDestroyNotify data_destroy)
{
FilterRule *rule;
g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
g_return_if_fail (func != NULL);
rule = g_new0 (FilterRule, 1);
rule->type = FILTER_RULE_CUSTOM;
rule->needed = needed;
rule->u.custom.func = func;
rule->u.custom.data = data;
rule->u.custom.data_destroy = data_destroy;
recent_filter_add_rule (filter, rule);
}
/**
* gtk_recent_filter_filter:
* @filter: a #GtkRecentFilter
* @filter_info: a #GtkRecentFilterInfo containing information
* about a recently used resource
*
* Tests whether a file should be displayed according to @filter.
* The #GtkRecentFilterInfo @filter_info should include
* the fields returned from gtk_recent_filter_get_needed(), and
* must set the #GtkRecentFilterInfo.contains field of @filter_info
* to indicate which fields have been set.
*
* This function will not typically be used by applications; it
* is intended principally for use in the implementation of
* #GtkRecentChooser.
*
* Returns: %TRUE if the file should be displayed
*
* Since: 2.10
*/
gboolean
gtk_recent_filter_filter (GtkRecentFilter *filter,
const GtkRecentFilterInfo *filter_info)
{
GSList *l;
g_return_val_if_fail (GTK_IS_RECENT_FILTER (filter), FALSE);
g_return_val_if_fail (filter_info != NULL, FALSE);
for (l = filter->rules; l != NULL; l = l->next)
{
FilterRule *rule = (FilterRule *) l->data;
if ((filter_info->contains & rule->needed) != rule->needed)
continue;
switch (rule->type)
{
case FILTER_RULE_MIME_TYPE:
if (filter_info->mime_type != NULL)
{
gchar *filter_content_type, *rule_content_type;
gboolean match;
filter_content_type = g_content_type_from_mime_type (filter_info->mime_type);
rule_content_type = g_content_type_from_mime_type (rule->u.mime_type);
match = g_content_type_is_a (filter_content_type, rule_content_type);
g_free (filter_content_type);
g_free (rule_content_type);
if (match)
return TRUE;
}
break;
case FILTER_RULE_APPLICATION:
if (filter_info->applications)
{
gint i;
for (i = 0; filter_info->applications[i] != NULL; i++)
{
if (strcmp (filter_info->applications[i], rule->u.application) == 0)
return TRUE;
}
}
break;
case FILTER_RULE_GROUP:
if (filter_info->groups)
{
gint i;
for (i = 0; filter_info->groups[i] != NULL; i++)
{
if (strcmp (filter_info->groups[i], rule->u.group) == 0)
return TRUE;
}
}
break;
case FILTER_RULE_PIXBUF_FORMATS:
{
GSList *list;
if (!filter_info->mime_type)
break;
for (list = rule->u.pixbuf_formats; list; list = list->next)
{
gint i;
gchar **mime_types;
mime_types = gdk_pixbuf_format_get_mime_types (list->data);
for (i = 0; mime_types[i] != NULL; i++)
{
if (strcmp (mime_types[i], filter_info->mime_type) == 0)
{
g_strfreev (mime_types);
return TRUE;
}
}
g_strfreev (mime_types);
}
break;
}
case FILTER_RULE_URI:
if ((filter_info->uri != NULL) &&
_gtk_fnmatch (rule->u.uri, filter_info->uri, FALSE))
return TRUE;
break;
case FILTER_RULE_DISPLAY_NAME:
if ((filter_info->display_name != NULL) &&
_gtk_fnmatch (rule->u.pattern, filter_info->display_name, FALSE))
return TRUE;
break;
case FILTER_RULE_AGE:
if ((filter_info->age != -1) &&
(filter_info->age < rule->u.age))
return TRUE;
break;
case FILTER_RULE_CUSTOM:
if (rule->u.custom.func (filter_info, rule->u.custom.data))
return TRUE;
break;
}
}
return FALSE;
}