Blame gtk/gtkrecentfilter.c

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/* GTK - The GIMP Toolkit
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 * gtkrecentfilter.h - Filter object for recently used resources
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 * Copyright (C) 2006, Emmanuele Bassi
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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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#include "config.h"
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#include <string.h>
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#include "gtkrecentfilter.h"
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#include "gtkintl.h"
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#include "gtkprivate.h"
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#include "gtkalias.h"
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typedef struct _GtkRecentFilterClass GtkRecentFilterClass;
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typedef struct _FilterRule FilterRule;
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typedef enum {
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  FILTER_RULE_URI,
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  FILTER_RULE_DISPLAY_NAME,
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  FILTER_RULE_MIME_TYPE,
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  FILTER_RULE_PIXBUF_FORMATS,
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  FILTER_RULE_APPLICATION,
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  FILTER_RULE_AGE,
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  FILTER_RULE_GROUP,
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  FILTER_RULE_CUSTOM
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} FilterRuleType;
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struct _GtkRecentFilter
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{
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  GtkObject parent_instance;
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  gchar *name;
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  GSList *rules;
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  GtkRecentFilterFlags needed;
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};
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struct _GtkRecentFilterClass
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{
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  GtkObjectClass parent_class;
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};
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struct _FilterRule
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{
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  FilterRuleType type;
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  GtkRecentFilterFlags needed;
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  union {
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    gchar *uri;
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    gchar *pattern;
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    gchar *mime_type;
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    GSList *pixbuf_formats;
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    gchar *application;
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    gchar *group;
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    gint age;
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    struct {
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      GtkRecentFilterFunc func;
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      gpointer data;
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      GDestroyNotify data_destroy;
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    } custom;
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  } u;
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};
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G_DEFINE_TYPE (GtkRecentFilter, gtk_recent_filter, GTK_TYPE_OBJECT)
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static void
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filter_rule_free (FilterRule *rule)
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{
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  switch (rule->type)
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    {
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    case FILTER_RULE_MIME_TYPE:
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      g_free (rule->u.mime_type);
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      break;
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    case FILTER_RULE_URI:
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      g_free (rule->u.uri);
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      break;
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    case FILTER_RULE_DISPLAY_NAME:
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      g_free (rule->u.pattern);
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      break;
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    case FILTER_RULE_PIXBUF_FORMATS:
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      g_slist_free (rule->u.pixbuf_formats);
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      break;
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    case FILTER_RULE_AGE:
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      break;
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    case FILTER_RULE_APPLICATION:
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      g_free (rule->u.application);
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      break;
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    case FILTER_RULE_GROUP:
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      g_free (rule->u.group);
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      break;
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    case FILTER_RULE_CUSTOM:
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      if (rule->u.custom.data_destroy)
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        rule->u.custom.data_destroy (rule->u.custom.data);
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      break;
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    default:
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      g_assert_not_reached ();
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      break;
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    }
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  g_free (rule);
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}
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static void
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gtk_recent_filter_finalize (GObject *object)
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{
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  GtkRecentFilter *filter = GTK_RECENT_FILTER (object);
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  g_free (filter->name);
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  if (filter->rules)
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    {
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      g_slist_foreach (filter->rules,
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      		       (GFunc) filter_rule_free,
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      		       NULL);
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      g_slist_free (filter->rules);
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    }
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  G_OBJECT_CLASS (gtk_recent_filter_parent_class)->finalize (object);
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}
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static void
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gtk_recent_filter_class_init (GtkRecentFilterClass *klass)
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{
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  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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  gobject_class->finalize = gtk_recent_filter_finalize;
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}
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static void
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gtk_recent_filter_init (GtkRecentFilter *filter)
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{
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}
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/*
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 * Public API
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 */
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/**
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 * gtk_recent_filter_new:
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 *
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 * Creates a new #GtkRecentFilter with no rules added to it.
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 * Such filter does not accept any recently used resources, so is not
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 * particularly useful until you add rules with
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 * gtk_recent_filter_add_pattern(), gtk_recent_filter_add_mime_type(),
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 * gtk_recent_filter_add_application(), gtk_recent_filter_add_age().
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 * To create a filter that accepts any recently used resource, use:
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 * |[
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 * GtkRecentFilter *filter = gtk_recent_filter_new ();
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 * gtk_recent_filter_add_pattern (filter, "*");
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 * ]|
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 *
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 * Return value: a new #GtkRecentFilter
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 *
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 * Since: 2.10
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 */
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GtkRecentFilter *
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gtk_recent_filter_new (void)
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{
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  return g_object_new (GTK_TYPE_RECENT_FILTER, NULL);
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}
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/**
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 * gtk_recent_filter_set_name:
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 * @filter: a #GtkRecentFilter
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 * @name: then human readable name of @filter
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 *
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 * Sets the human-readable name of the filter; this is the string
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 * that will be displayed in the recently used resources selector
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 * user interface if there is a selectable list of filters.
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 *
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 * Since: 2.10
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 */
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void
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gtk_recent_filter_set_name (GtkRecentFilter *filter,
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			    const gchar     *name)
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{
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  g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
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  g_free (filter->name);
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  if (name)
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    filter->name = g_strdup (name);
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}
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/**
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 * gtk_recent_filter_get_name:
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 * @filter: a #GtkRecentFilter
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 *
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 * Gets the human-readable name for the filter.
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 * See gtk_recent_filter_set_name().
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 *
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 * Return value: the name of the filter, or %NULL.  The returned string
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 *   is owned by the filter object and should not be freed.
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 *
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 * Since: 2.10
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 */
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const gchar *
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gtk_recent_filter_get_name (GtkRecentFilter *filter)
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{
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  g_return_val_if_fail (GTK_IS_RECENT_FILTER (filter), NULL);
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  return filter->name;
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}
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/**
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 * gtk_recent_filter_get_needed:
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 * @filter: a #GtkRecentFilter
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 *
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 * Gets the fields that need to be filled in for the structure
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 * passed to gtk_recent_filter_filter()
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 * 
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 * This function will not typically be used by applications; it
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 * is intended principally for use in the implementation of
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 * #GtkRecentChooser.
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 * 
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 * Return value: bitfield of flags indicating needed fields when
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 *   calling gtk_recent_filter_filter()
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 *
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 * Since: 2.10
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 */
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GtkRecentFilterFlags
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gtk_recent_filter_get_needed (GtkRecentFilter *filter)
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{
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  return filter->needed;
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}
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static void
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recent_filter_add_rule (GtkRecentFilter *filter,
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			FilterRule      *rule)
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{
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  filter->needed |= rule->needed;
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  filter->rules = g_slist_append (filter->rules, rule);
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}
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/**
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 * gtk_recent_filter_add_mime_type:
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 * @filter: a #GtkRecentFilter
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 * @mime_type: a MIME type
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 *
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 * Adds a rule that allows resources based on their registered MIME type.
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 *
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 * Since: 2.10
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 */
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void
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gtk_recent_filter_add_mime_type (GtkRecentFilter *filter,
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				 const gchar     *mime_type)
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{
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  FilterRule *rule;
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  g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
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  g_return_if_fail (mime_type != NULL);
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  rule = g_new0 (FilterRule, 1);
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  rule->type = FILTER_RULE_MIME_TYPE;
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  rule->needed = GTK_RECENT_FILTER_MIME_TYPE;
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  rule->u.mime_type = g_strdup (mime_type);
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  recent_filter_add_rule (filter, rule);
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}
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/**
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 * gtk_recent_filter_add_pattern:
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 * @filter: a #GtkRecentFilter
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 * @pattern: a file pattern
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 *
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 * Adds a rule that allows resources based on a pattern matching their
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 * display name.
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 *
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 * Since: 2.10
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 */
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void
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gtk_recent_filter_add_pattern (GtkRecentFilter *filter,
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			       const gchar     *pattern)
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{
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  FilterRule *rule;
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  g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
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  g_return_if_fail (pattern != NULL);
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  rule = g_new0 (FilterRule, 1);
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  rule->type = FILTER_RULE_DISPLAY_NAME;
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  rule->needed = GTK_RECENT_FILTER_DISPLAY_NAME;
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  rule->u.pattern = g_strdup (pattern);
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  recent_filter_add_rule (filter, rule);
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}
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/**
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 * gtk_recent_filter_add_pixbuf_formats:
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 * @filter: a #GtkRecentFilter
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 *
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 * Adds a rule allowing image files in the formats supported
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 * by GdkPixbuf.
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 *
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 * Since: 2.10
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 */
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void
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gtk_recent_filter_add_pixbuf_formats (GtkRecentFilter *filter)
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{
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  FilterRule *rule;
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  g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
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  rule = g_new0 (FilterRule, 1);
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  rule->type = FILTER_RULE_PIXBUF_FORMATS;
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  rule->needed = GTK_RECENT_FILTER_MIME_TYPE;
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  rule->u.pixbuf_formats = gdk_pixbuf_get_formats ();
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  recent_filter_add_rule (filter, rule);
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}
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/**
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 * gtk_recent_filter_add_application:
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 * @filter: a #GtkRecentFilter
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 * @application: an application name
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 *
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 * Adds a rule that allows resources based on the name of the application
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 * that has registered them.
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 *
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 * Since: 2.10
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 */
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void
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gtk_recent_filter_add_application (GtkRecentFilter *filter,
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				   const gchar     *application)
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{
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  FilterRule *rule;
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  g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
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  g_return_if_fail (application != NULL);
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  rule = g_new0 (FilterRule, 1);
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  rule->type = FILTER_RULE_APPLICATION;
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  rule->needed = GTK_RECENT_FILTER_APPLICATION;
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  rule->u.application = g_strdup (application);
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  recent_filter_add_rule (filter, rule);
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}
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/**
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 * gtk_recent_filter_add_group:
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 * @filter: a #GtkRecentFilter
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 * @group: a group name
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 *
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 * Adds a rule that allows resources based on the name of the group
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 * to which they belong
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 *
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 * Since: 2.10
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 */
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void
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gtk_recent_filter_add_group (GtkRecentFilter *filter,
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			     const gchar     *group)
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{
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  FilterRule *rule;
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  g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
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  g_return_if_fail (group != NULL);
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  rule = g_new0 (FilterRule, 1);
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  rule->type = FILTER_RULE_GROUP;
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  rule->needed = GTK_RECENT_FILTER_GROUP;
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  rule->u.group = g_strdup (group);
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  recent_filter_add_rule (filter, rule);
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}
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/**
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 * gtk_recent_filter_add_age:
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 * @filter: a #GtkRecentFilter
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 * @days: number of days
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 *
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 * Adds a rule that allows resources based on their age - that is, the number
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 * of days elapsed since they were last modified.
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 *
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 * Since: 2.10
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 */
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void
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gtk_recent_filter_add_age (GtkRecentFilter *filter,
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			   gint             days)
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{
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  FilterRule *rule;
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  g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
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  rule = g_new0 (FilterRule, 1);
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  rule->type = FILTER_RULE_AGE;
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  rule->needed = GTK_RECENT_FILTER_AGE;
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  rule->u.age = days;
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  recent_filter_add_rule (filter, rule);
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}
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/**
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 * gtk_recent_filter_add_custom:
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 * @filter: a #GtkRecentFilter
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 * @needed: bitfield of flags indicating the information that the custom
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 *          filter function needs.
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 * @func: callback function; if the function returns %TRUE, then
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 *   the file will be displayed.
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 * @data: data to pass to @func
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 * @data_destroy: function to call to free @data when it is no longer needed.
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 * 
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 * Adds a rule to a filter that allows resources based on a custom callback
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 * function. The bitfield @needed which is passed in provides information
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 * about what sorts of information that the filter function needs;
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 * this allows GTK+ to avoid retrieving expensive information when
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 * it isn't needed by the filter.
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 * 
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 * Since: 2.10
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 **/
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void
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gtk_recent_filter_add_custom (GtkRecentFilter      *filter,
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			      GtkRecentFilterFlags  needed,
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			      GtkRecentFilterFunc   func,
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			      gpointer              data,
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			      GDestroyNotify        data_destroy)
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{
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  FilterRule *rule;
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  g_return_if_fail (GTK_IS_RECENT_FILTER (filter));
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  g_return_if_fail (func != NULL);
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  rule = g_new0 (FilterRule, 1);
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  rule->type = FILTER_RULE_CUSTOM;
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  rule->needed = needed;
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  rule->u.custom.func = func;
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  rule->u.custom.data = data;
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  rule->u.custom.data_destroy = data_destroy;
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  recent_filter_add_rule (filter, rule);
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}
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/**
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 * gtk_recent_filter_filter:
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 * @filter: a #GtkRecentFilter
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 * @filter_info: a #GtkRecentFilterInfo structure containing information
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 *   about a recently used resource
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 *
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 * Tests whether a file should be displayed according to @filter.
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 * The #GtkRecentFilterInfo structure @filter_info should include
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 * the fields returned from gtk_recent_filter_get_needed().
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 *
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 * This function will not typically be used by applications; it
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 * is intended principally for use in the implementation of
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 * #GtkRecentChooser.
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 * 
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 * Return value: %TRUE if the file should be displayed
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 *
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 * Since: 2.10
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 */
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gboolean
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gtk_recent_filter_filter (GtkRecentFilter           *filter,
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			  const GtkRecentFilterInfo *filter_info)
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{
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  GSList *l;
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  g_return_val_if_fail (GTK_IS_RECENT_FILTER (filter), FALSE);
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  g_return_val_if_fail (filter_info != NULL, FALSE);
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  for (l = filter->rules; l != NULL; l = l->next)
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    {
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      FilterRule *rule = (FilterRule *) l->data;
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      if ((filter_info->contains & rule->needed) != rule->needed)
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        continue;
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      switch (rule->type)
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        {
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        case FILTER_RULE_MIME_TYPE:
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          if (filter_info->mime_type != NULL)
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            {
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              gchar *filter_content_type, *rule_content_type;
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              gboolean match;
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              filter_content_type = g_content_type_from_mime_type (filter_info->mime_type);
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              rule_content_type = g_content_type_from_mime_type (rule->u.mime_type);
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              match = g_content_type_is_a (filter_content_type, rule_content_type);
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              g_free (filter_content_type);
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              g_free (rule_content_type);
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              if (match)
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                return TRUE;
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            }
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          break;
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        case FILTER_RULE_APPLICATION:
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          if (filter_info->applications)
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            {
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              gint i;
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              for (i = 0; filter_info->applications[i] != NULL; i++)
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                {
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                  if (strcmp (filter_info->applications[i], rule->u.application) == 0)
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                    return TRUE;
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                }
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            }
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          break;
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	case FILTER_RULE_GROUP:
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	  if (filter_info->groups)
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            {
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	      gint i;
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	      for (i = 0; filter_info->groups[i] != NULL; i++)
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		{
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		  if (strcmp (filter_info->groups[i], rule->u.group) == 0)
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		    return TRUE;
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		}
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	    }
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	  break;
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	case FILTER_RULE_PIXBUF_FORMATS:
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	  {
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            GSList *list;
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	    if (!filter_info->mime_type)
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	      break;
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	    for (list = rule->u.pixbuf_formats; list; list = list->next)
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              {
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                gint i;
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		gchar **mime_types;
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		mime_types = gdk_pixbuf_format_get_mime_types (list->data);
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		for (i = 0; mime_types[i] != NULL; i++)
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                  {
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                    if (strcmp (mime_types[i], filter_info->mime_type) == 0)
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                      {
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			g_strfreev (mime_types);
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			return TRUE;
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		      }
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		  }
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		g_strfreev (mime_types);
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	      }
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	    break;
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	  }
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        case FILTER_RULE_URI:
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          if ((filter_info->uri != NULL) &&
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              _gtk_fnmatch (rule->u.uri, filter_info->uri, FALSE))
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            return TRUE;
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          break;
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        case FILTER_RULE_DISPLAY_NAME:
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          if ((filter_info->display_name != NULL) &&
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              _gtk_fnmatch (rule->u.pattern, filter_info->display_name, FALSE))
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            return TRUE;
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          break;
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        case FILTER_RULE_AGE:
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          if ((filter_info->age != -1) &&
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              (filter_info->age < rule->u.age))
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            return TRUE;
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          break;
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        case FILTER_RULE_CUSTOM:
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          if (rule->u.custom.func (filter_info, rule->u.custom.data))
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            return TRUE;
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          break;
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        }
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    }
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  return FALSE;
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}
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#define __GTK_RECENT_FILTER_C__
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#include "gtkaliasdef.c"