gtk2/gtk/gtkfilechooser.c
Matthias Clasen f561000124 docs: Clean up many dangling links
In many cases, these were references to no longer
existing api, so some rewording was necessary.
2020-08-04 22:11:34 -04:00

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/* GTK - The GIMP Toolkit
* gtkfilechooser.c: Abstract interface for file selector GUIs
* Copyright (C) 2003, 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 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/>.
*/
#include "config.h"
#include "gtkfilechooser.h"
#include "gtkfilechooserprivate.h"
#include "gtkintl.h"
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtkmarshalers.h"
/**
* SECTION:gtkfilechooser
* @Short_description: File chooser interface used by GtkFileChooserWidget and GtkFileChooserDialog
* @Title: GtkFileChooser
* @See_also: #GtkFileChooserDialog, #GtkFileChooserWidget, #GtkFileChooserButton
*
* #GtkFileChooser is an interface that can be implemented by file
* selection widgets. In GTK+, the main objects that implement this
* interface are #GtkFileChooserWidget, #GtkFileChooserDialog, and
* #GtkFileChooserButton. You do not need to write an object that
* implements the #GtkFileChooser interface unless you are trying to
* adapt an existing file selector to expose a standard programming
* interface.
*
* #GtkFileChooser allows for shortcuts to various places in the filesystem.
* In the default implementation these are displayed in the left pane. It
* may be a bit confusing at first that these shortcuts come from various
* sources and in various flavours, so lets explain the terminology here:
*
* - Bookmarks: are created by the user, by dragging folders from the
* right pane to the left pane, or by using the “Add”. Bookmarks
* can be renamed and deleted by the user.
*
* - Shortcuts: can be provided by the application. For example, a Paint
* program may want to add a shortcut for a Clipart folder. Shortcuts
* cannot be modified by the user.
*
* - Volumes: are provided by the underlying filesystem abstraction. They are
* the “roots” of the filesystem.
*
* # File Names and Encodings
*
* When the user is finished selecting files in a
* #GtkFileChooser, your program can get the selected filenames as
* #GFiles.
*
* # Adding options
*
* You can add extra widgets to a file chooser to provide options
* that are not present in the default design, by using
* gtk_file_chooser_add_choice(). Each choice has an identifier and
* a user visible label; additionally, each choice can have multiple
* options. If a choice has no option, it will be rendered as a
* check button with the given label; if a choice has options, it will
* be rendered as a combo box.
*/
typedef GtkFileChooserIface GtkFileChooserInterface;
G_DEFINE_INTERFACE (GtkFileChooser, gtk_file_chooser, G_TYPE_OBJECT);
static void
gtk_file_chooser_default_init (GtkFileChooserInterface *iface)
{
g_object_interface_install_property (iface,
g_param_spec_enum ("action",
P_("Action"),
P_("The type of operation that the file selector is performing"),
GTK_TYPE_FILE_CHOOSER_ACTION,
GTK_FILE_CHOOSER_ACTION_OPEN,
GTK_PARAM_READWRITE));
g_object_interface_install_property (iface,
g_param_spec_object ("filter",
P_("Filter"),
P_("The current filter for selecting which files are displayed"),
GTK_TYPE_FILE_FILTER,
GTK_PARAM_READWRITE));
g_object_interface_install_property (iface,
g_param_spec_boolean ("select-multiple",
P_("Select Multiple"),
P_("Whether to allow multiple files to be selected"),
FALSE,
GTK_PARAM_READWRITE));
/**
* GtkFileChooser:filters:
*
* A #GListModel containing the filters that have been
* added with gtk_file_chooser_add_filter().
*
* The returned object should not be modified. It may
* or may not be updated for later changes.
*/
g_object_interface_install_property (iface,
g_param_spec_object ("filters",
P_("Filters"),
P_("List model of filters"),
G_TYPE_LIST_MODEL,
GTK_PARAM_READABLE));
/**
* GtkFileChooser:shortcut-folders:
*
* A #GListModel containing the shortcut folders that have been
* added with gtk_file_chooser_add_shortcut_folder().
*
* The returned object should not be modified. It may
* or may not be updated for later changes.
*/
g_object_interface_install_property (iface,
g_param_spec_object ("shortcut-folders",
P_("Shortcut Folders"),
P_("List model of shortcut folders"),
G_TYPE_LIST_MODEL,
GTK_PARAM_READABLE));
/**
* GtkFileChooser:create-folders:
*
* Whether a file chooser not in %GTK_FILE_CHOOSER_ACTION_OPEN mode
* will offer the user to create new folders.
*/
g_object_interface_install_property (iface,
g_param_spec_boolean ("create-folders",
P_("Allow folder creation"),
P_("Whether a file chooser not in open mode "
"will offer the user to create new folders."),
TRUE,
GTK_PARAM_READWRITE));
}
/**
* gtk_file_chooser_error_quark:
*
* Registers an error quark for #GtkFileChooser if necessary.
*
* Returns: The error quark used for #GtkFileChooser errors.
**/
GQuark
gtk_file_chooser_error_quark (void)
{
return g_quark_from_static_string ("gtk-file-chooser-error-quark");
}
/**
* gtk_file_chooser_set_action:
* @chooser: a #GtkFileChooser
* @action: the action that the file selector is performing
*
* Sets the type of operation that the chooser is performing; the
* user interface is adapted to suit the selected action. For example,
* an option to create a new folder might be shown if the action is
* %GTK_FILE_CHOOSER_ACTION_SAVE but not if the action is
* %GTK_FILE_CHOOSER_ACTION_OPEN.
**/
void
gtk_file_chooser_set_action (GtkFileChooser *chooser,
GtkFileChooserAction action)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
g_object_set (chooser, "action", action, NULL);
}
/**
* gtk_file_chooser_get_action:
* @chooser: a #GtkFileChooser
*
* Gets the type of operation that the file chooser is performing; see
* gtk_file_chooser_set_action().
*
* Returns: the action that the file selector is performing
**/
GtkFileChooserAction
gtk_file_chooser_get_action (GtkFileChooser *chooser)
{
GtkFileChooserAction action;
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), FALSE);
g_object_get (chooser, "action", &action, NULL);
return action;
}
/**
* gtk_file_chooser_set_select_multiple:
* @chooser: a #GtkFileChooser
* @select_multiple: %TRUE if multiple files can be selected.
*
* Sets whether multiple files can be selected in the file selector. This is
* only relevant if the action is set to be %GTK_FILE_CHOOSER_ACTION_OPEN or
* %GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER.
**/
void
gtk_file_chooser_set_select_multiple (GtkFileChooser *chooser,
gboolean select_multiple)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
g_object_set (chooser, "select-multiple", select_multiple, NULL);
}
/**
* gtk_file_chooser_get_select_multiple:
* @chooser: a #GtkFileChooser
*
* Gets whether multiple files can be selected in the file
* selector. See gtk_file_chooser_set_select_multiple().
*
* Returns: %TRUE if multiple files can be selected.
**/
gboolean
gtk_file_chooser_get_select_multiple (GtkFileChooser *chooser)
{
gboolean select_multiple;
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), FALSE);
g_object_get (chooser, "select-multiple", &select_multiple, NULL);
return select_multiple;
}
/**
* gtk_file_chooser_set_create_folders:
* @chooser: a #GtkFileChooser
* @create_folders: %TRUE if the Create Folder button should be displayed
*
* Sets whether file choser will offer to create new folders.
* This is only relevant if the action is not set to be
* %GTK_FILE_CHOOSER_ACTION_OPEN.
**/
void
gtk_file_chooser_set_create_folders (GtkFileChooser *chooser,
gboolean create_folders)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
g_object_set (chooser, "create-folders", create_folders, NULL);
}
/**
* gtk_file_chooser_get_create_folders:
* @chooser: a #GtkFileChooser
*
* Gets whether file choser will offer to create new folders.
* See gtk_file_chooser_set_create_folders().
*
* Returns: %TRUE if the Create Folder button should be displayed.
**/
gboolean
gtk_file_chooser_get_create_folders (GtkFileChooser *chooser)
{
gboolean create_folders;
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), FALSE);
g_object_get (chooser, "create-folders", &create_folders, NULL);
return create_folders;
}
/**
* gtk_file_chooser_set_current_name:
* @chooser: a #GtkFileChooser
* @name: (type filename): the filename to use, as a UTF-8 string
*
* Sets the current name in the file selector, as if entered
* by the user. Note that the name passed in here is a UTF-8
* string rather than a filename. This function is meant for
* such uses as a suggested name in a “Save As...” dialog. You can
* pass “Untitled.doc” or a similarly suitable suggestion for the @name.
*
* If you want to preselect a particular existing file, you should use
* gtk_file_chooser_set_file() instead.
*
* Please see the documentation for those functions for an example of using
* gtk_file_chooser_set_current_name() as well.
**/
void
gtk_file_chooser_set_current_name (GtkFileChooser *chooser,
const char *name)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
g_return_if_fail (name != NULL);
GTK_FILE_CHOOSER_GET_IFACE (chooser)->set_current_name (chooser, name);
}
/**
* gtk_file_chooser_get_current_name:
* @chooser: a #GtkFileChooser
*
* Gets the current name in the file selector, as entered by the user in the
* text entry for “Name”.
*
* This is meant to be used in save dialogs, to get the currently typed filename
* when the file itself does not exist yet.
*
* Returns: The raw text from the file choosers “Name” entry. Free this with
* g_free(). Note that this string is not a full pathname or URI; it is
* whatever the contents of the entry are. Note also that this string is in
* UTF-8 encoding, which is not necessarily the systems encoding for filenames.
**/
char *
gtk_file_chooser_get_current_name (GtkFileChooser *chooser)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), NULL);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->get_current_name (chooser);
}
void
gtk_file_chooser_select_all (GtkFileChooser *chooser)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
GTK_FILE_CHOOSER_GET_IFACE (chooser)->select_all (chooser);
}
void
gtk_file_chooser_unselect_all (GtkFileChooser *chooser)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
GTK_FILE_CHOOSER_GET_IFACE (chooser)->unselect_all (chooser);
}
/**
* gtk_file_chooser_set_current_folder:
* @chooser: a #GtkFileChooser
* @file: the #GFile for the new folder
* @error: location to store error, or %NULL.
*
* Sets the current folder for @chooser from a #GFile.
*
* Returns: %TRUE if the folder could be changed successfully, %FALSE
* otherwise.
**/
gboolean
gtk_file_chooser_set_current_folder (GtkFileChooser *chooser,
GFile *file,
GError **error)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->set_current_folder (chooser, file, error);
}
/**
* gtk_file_chooser_get_current_folder:
* @chooser: a #GtkFileChooser
*
* Gets the current folder of @chooser as #GFile.
*
* Returns: (transfer full): the #GFile for the current folder.
*/
GFile *
gtk_file_chooser_get_current_folder (GtkFileChooser *chooser)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), NULL);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->get_current_folder (chooser);
}
gboolean
gtk_file_chooser_select_file (GtkFileChooser *chooser,
GFile *file,
GError **error)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->select_file (chooser, file, error);
}
void
gtk_file_chooser_unselect_file (GtkFileChooser *chooser,
GFile *file)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
g_return_if_fail (G_IS_FILE (file));
GTK_FILE_CHOOSER_GET_IFACE (chooser)->unselect_file (chooser, file);
}
/**
* gtk_file_chooser_get_files:
* @chooser: a #GtkFileChooser
*
* Lists all the selected files and subfolders in the current folder
* of @chooser as #GFile.
*
* Returns: (transfer full): a list model containing a #GFile for each
* selected file and subfolder in the current folder. Free the returned
* list with g_object_unref().
*/
GListModel *
gtk_file_chooser_get_files (GtkFileChooser *chooser)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), NULL);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->get_files (chooser);
}
/**
* gtk_file_chooser_set_file:
* @chooser: a #GtkFileChooser
* @file: the #GFile to set as current
* @error: (allow-none): location to store the error, or %NULL to ignore errors.
*
* Sets @file as the current filename for the file chooser, by changing
* to the files parent folder and actually selecting the file in list. If
* the @chooser is in %GTK_FILE_CHOOSER_ACTION_SAVE mode, the files base name
* will also appear in the dialogs file name entry.
*
* If the file name isnt in the current folder of @chooser, then the current
* folder of @chooser will be changed to the folder containing @filename.
*
* Note that the file must exist, or nothing will be done except
* for the directory change.
*
* If you are implementing a save dialog,
* you should use this function if you already have a file name to which the
* user may save; for example, when the user opens an existing file and then
* does Save As... If you dont have
* a file name already — for example, if the user just created a new
* file and is saving it for the first time, do not call this function.
* Instead, use something similar to this:
* |[<!-- language="C" -->
* static void
* prepare_file_chooser (GtkFileChooser *chooser,
* GFile *existing_file)
* {
* gboolean document_is_new = (existing_file == NULL);
*
* if (document_is_new)
* {
* GFile *default_file_for_saving = g_file_new_for_path ("./out.txt");
* // the user just created a new document
* gtk_file_chooser_set_current_folder (chooser, default_file_for_saving, NULL);
* gtk_file_chooser_set_current_name (chooser, "Untitled document");
* g_object_unref (default_file_for_saving);
* }
* else
* {
* // the user edited an existing document
* gtk_file_chooser_set_file (chooser, existing_file, NULL);
* }
* }
* ]|
*
* Returns: Not useful.
**/
gboolean
gtk_file_chooser_set_file (GtkFileChooser *chooser,
GFile *file,
GError **error)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
gtk_file_chooser_unselect_all (chooser);
return gtk_file_chooser_select_file (chooser, file, error);
}
/**
* gtk_file_chooser_get_file:
* @chooser: a #GtkFileChooser
*
* Gets the #GFile for the currently selected file in
* the file selector. If multiple files are selected,
* one of the files will be returned at random.
*
* If the file chooser is in folder mode, this function returns the selected
* folder.
*
* Returns: (transfer full): a selected #GFile. You own the returned file;
* use g_object_unref() to release it.
**/
GFile *
gtk_file_chooser_get_file (GtkFileChooser *chooser)
{
GListModel *list;
GFile *result = NULL;
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), NULL);
list = gtk_file_chooser_get_files (chooser);
if (g_list_model_get_n_items (list) > 0)
result = g_list_model_get_item (list, 0);
g_object_unref (list);
return result;
}
/**
* gtk_file_chooser_add_shortcut_folder:
* @chooser: a #GtkFileChooser
* @folder: a #GFile for the folder to add
* @error: location to store error, or %NULL
*
* Adds a folder to be displayed with the shortcut folders in a file chooser.
*
* Returns: %TRUE if the folder could be added successfully, %FALSE
* otherwise.
**/
gboolean
gtk_file_chooser_add_shortcut_folder (GtkFileChooser *chooser,
GFile *folder,
GError **error)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), FALSE);
g_return_val_if_fail (G_IS_FILE (folder), FALSE);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->add_shortcut_folder (chooser, folder, error);
}
/**
* gtk_file_chooser_remove_shortcut_folder:
* @chooser: a #GtkFileChooser
* @folder: a #GFile for the folder to remove
* @error: location to store error, or %NULL
*
* Removes a folder from the shortcut folders in a file chooser.
*
* Returns: %TRUE if the folder could be removed successfully, %FALSE
* otherwise.
**/
gboolean
gtk_file_chooser_remove_shortcut_folder (GtkFileChooser *chooser,
GFile *folder,
GError **error)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), FALSE);
g_return_val_if_fail (G_IS_FILE (folder), FALSE);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->remove_shortcut_folder (chooser, folder, error);
}
/**
* gtk_file_chooser_add_filter:
* @chooser: a #GtkFileChooser
* @filter: (transfer none): a #GtkFileFilter
*
* Adds @filter to the list of filters that the user can select between.
* When a filter is selected, only files that are passed by that
* filter are displayed.
*
* Note that the @chooser takes ownership of the filter if it is floating,
* so you have to ref and sink it if you want to keep a reference.
**/
void
gtk_file_chooser_add_filter (GtkFileChooser *chooser,
GtkFileFilter *filter)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
GTK_FILE_CHOOSER_GET_IFACE (chooser)->add_filter (chooser, filter);
}
/**
* gtk_file_chooser_remove_filter:
* @chooser: a #GtkFileChooser
* @filter: a #GtkFileFilter
*
* Removes @filter from the list of filters that the user can select between.
**/
void
gtk_file_chooser_remove_filter (GtkFileChooser *chooser,
GtkFileFilter *filter)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
GTK_FILE_CHOOSER_GET_IFACE (chooser)->remove_filter (chooser, filter);
}
/**
* gtk_file_chooser_get_filters:
* @chooser: a #GtkFileChooser
*
* Gets the current set of user-selectable filters, as a list model; see
* gtk_file_chooser_add_filter(), gtk_file_chooser_remove_filter().
*
* You should not modify the returned list model. Future changes to
* @chooser may or may not affect the returned model.
*
* Returns: (transfer full): a #GListModel containing the current set
* of user-selectable filters.
**/
GListModel *
gtk_file_chooser_get_filters (GtkFileChooser *chooser)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), NULL);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->get_filters (chooser);
}
/**
* gtk_file_chooser_set_filter:
* @chooser: a #GtkFileChooser
* @filter: a #GtkFileFilter
*
* Sets the current filter; only the files that pass the
* filter will be displayed. If the user-selectable list of filters
* is non-empty, then the filter should be one of the filters
* in that list. Setting the current filter when the list of
* filters is empty is useful if you want to restrict the displayed
* set of files without letting the user change it.
**/
void
gtk_file_chooser_set_filter (GtkFileChooser *chooser,
GtkFileFilter *filter)
{
g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
g_return_if_fail (GTK_IS_FILE_FILTER (filter));
g_object_set (chooser, "filter", filter, NULL);
}
/**
* gtk_file_chooser_get_filter:
* @chooser: a #GtkFileChooser
*
* Gets the current filter; see gtk_file_chooser_set_filter().
*
* Returns: (nullable) (transfer none): the current filter, or %NULL
**/
GtkFileFilter *
gtk_file_chooser_get_filter (GtkFileChooser *chooser)
{
GtkFileFilter *filter;
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), NULL);
g_object_get (chooser, "filter", &filter, NULL);
/* Horrid hack; g_object_get() refs returned objects but
* that contradicts the memory management conventions
* for accessors.
*/
if (filter)
g_object_unref (filter);
return filter;
}
/**
* gtk_file_chooser_get_shortcut_folders:
* @chooser: a #GtkFileChooser
*
* Queries the list of shortcut folders in the file chooser, as set by
* gtk_file_chooser_add_shortcut_folder().
*
* You should not modify the returned list model. Future changes to
* @chooser may or may not affect the returned model.
*
* Returns: (transfer full): A list model of #GFiles
*/
GListModel *
gtk_file_chooser_get_shortcut_folders (GtkFileChooser *chooser)
{
g_return_val_if_fail (GTK_IS_FILE_CHOOSER (chooser), NULL);
return GTK_FILE_CHOOSER_GET_IFACE (chooser)->get_shortcut_folders (chooser);
}
/**
* gtk_file_chooser_add_choice:
* @chooser: a #GtkFileChooser
* @id: id for the added choice
* @label: user-visible label for the added choice
* @options: (nullable) (array zero-terminated=1): ids for the options of the choice, or %NULL for a boolean choice
* @option_labels: (nullable) (array zero-terminated=1): user-visible labels for the options, must be the same length as @options
*
* Adds a 'choice' to the file chooser. This is typically implemented
* as a combobox or, for boolean choices, as a checkbutton. You can select
* a value using gtk_file_chooser_set_choice() before the dialog is shown,
* and you can obtain the user-selected value in the ::response signal handler
* using gtk_file_chooser_get_choice().
*/
void
gtk_file_chooser_add_choice (GtkFileChooser *chooser,
const char *id,
const char *label,
const char **options,
const char **option_labels)
{
GtkFileChooserIface *iface = GTK_FILE_CHOOSER_GET_IFACE (chooser);
if (iface->add_choice)
iface->add_choice (chooser, id, label, options, option_labels);
}
/**
* gtk_file_chooser_remove_choice:
* @chooser: a #GtkFileChooser
* @id: the ID of the choice to remove
*
* Removes a 'choice' that has been added with gtk_file_chooser_add_choice().
*/
void
gtk_file_chooser_remove_choice (GtkFileChooser *chooser,
const char *id)
{
GtkFileChooserIface *iface = GTK_FILE_CHOOSER_GET_IFACE (chooser);
if (iface->remove_choice)
iface->remove_choice (chooser, id);
}
/**
* gtk_file_chooser_set_choice:
* @chooser: a #GtkFileChooser
* @id: the ID of the choice to set
* @option: the ID of the option to select
*
* Selects an option in a 'choice' that has been added with
* gtk_file_chooser_add_choice(). For a boolean choice, the
* possible options are "true" and "false".
*/
void
gtk_file_chooser_set_choice (GtkFileChooser *chooser,
const char *id,
const char *option)
{
GtkFileChooserIface *iface = GTK_FILE_CHOOSER_GET_IFACE (chooser);
if (iface->set_choice)
iface->set_choice (chooser, id, option);
}
/**
* gtk_file_chooser_get_choice:
* @chooser: a #GtkFileChooser
* @id: the ID of the choice to get
*
* Gets the currently selected option in the 'choice' with the given ID.
*
* Returns: the ID of the currently selected option
*/
const char *
gtk_file_chooser_get_choice (GtkFileChooser *chooser,
const char *id)
{
GtkFileChooserIface *iface = GTK_FILE_CHOOSER_GET_IFACE (chooser);
if (iface->get_choice)
return iface->get_choice (chooser, id);
return NULL;
}