Class FileChooserNative

This is typically implemented as a combobox or, for boolean choices, as a checkbutton. You can select a value using [methodGtk.FileChooser.set_choice] before the dialog is shown, and you can obtain the user-selected value in the [signalGtk.Dialog::response] signal handler using [methodGtk.FileChooser.get_choice].

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.

Whenever the source_property is changed the target_property is updated using the same value. For instance:

  g_object_bind_property (action, "active", widget, "sensitive", 0);

Will result in the "sensitive" property of the widget #GObject instance to be updated with the same value of the "active" property of the action #GObject instance.

If flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual: if target_property on target changes then the source_property on source will be updated as well.

The binding will automatically be removed when either the source or the target instances are finalized. To remove the binding without affecting the source and the target you can just call g_object_unref() on the returned #GBinding instance.

Removing the binding by calling g_object_unref() on it must only be done if the binding, source and target are only used from a single thread and it is clear that both source and target outlive the binding. Especially it is not safe to rely on this if the binding, source or target can be finalized from different threads. Keep another reference to the binding and use g_binding_unbind() instead to be on the safe side.

A #GObject can have multiple bindings.

This function is the language bindings friendly version of g_object_bind_property_full(), using #GClosures instead of function pointers.

When a dialog is destroyed, it will break any references it holds to other objects.

If it is visible it will be hidden and any underlying window system resources will be destroyed.

Note that this does not release any reference to the object (as opposed to destroying a GtkWindow) because there is no reference from the windowing system to the GtkNativeDialog.

This is necessary for accessors that modify multiple properties to prevent premature notification while the object is still being modified.

This is meant to be used in save dialogs, to get the currently typed filename when the file itself does not exist yet.

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.

See [methodGtk.FileChooser.add_filter] and [methodGtk.FileChooser.remove_filter] for changing individual filters.

You should not modify the returned list model. Future changes to chooser may or may not affect the returned model.

The value can be:

• an empty #GValue initialized by %G_VALUE_INIT, which will be automatically initialized with the expected type of the property (since GLib 2.60)
• a #GValue initialized with the expected type of the property
• a #GValue initialized with a type to which the expected type of the property can be transformed

In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset().

Note that g_object_get_property() is really intended for language bindings, g_object_get() is much more convenient for C programming.

You should not modify the returned list model. Future changes to chooser may or may not affect the returned model.

Once this is called the [signalGtk.NativeDialog::response] signal will not be emitted until after the next call to [methodGtk.NativeDialog.show].

If the dialog is not visible this does nothing.

When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.

Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.

This function omits the property name lookup, hence it is faster than g_object_notify().

One way to avoid using g_object_notify() from within the class that registered the properties, and using g_object_notify_by_pspec() instead, is to store the GParamSpec used with g_object_class_install_property() inside a static array, e.g.:

  enum
  {
    PROP_0,
    PROP_FOO,
    PROP_LAST
  };

  static GParamSpec *properties[PROP_LAST];

  static void
  my_object_class_init (MyObjectClass *klass)
  {
    properties[PROP_FOO] = g_param_spec_int ("foo", "Foo", "The foo",
                                             0, 100,
                                             50,
                                             G_PARAM_READWRITE);
    g_object_class_install_property (gobject_class,
                                     PROP_FOO,
                                     properties[PROP_FOO]);
  }

and then notify a change on the "foo" property with:

  g_object_notify_by_pspec (self, properties[PROP_FOO]);

Since GLib 2.56, if GLIB_VERSION_MAX_ALLOWED is 2.56 or greater, the type of object will be propagated to the return type (using the GCC typeof() extension), so any casting the caller needs to do on the return type must be explicit.

In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one.

Since GLib 2.56, the type of object will be propagated to the return type under the same conditions as for g_object_ref().

This function should only be called from object system implementations.

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.

For a boolean choice, the possible options are "true" and "false".

This is only relevant if the action is not set to be %GTK_FILE_CHOOSER_ACTION_OPEN.

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 [methodGtk.FileChooser.set_file] instead.

Please see the documentation for those functions for an example of using [methodGtk.FileChooser.set_current_name] as well.

If the object already had an association with that name, the old association will be destroyed.

Internally, the key is converted to a #GQuark using g_quark_from_string(). This means a copy of key is kept permanently (even after object has been finalized) — so it is recommended to only use a small, bounded set of values for key in your program, to avoid the #GQuark storage growing unbounded.

This includes changing to the file’s parent folder and actually selecting the file in list. If the chooser is in %GTK_FILE_CHOOSER_ACTION_SAVE mode, the file’s base name will also appear in the dialog’s file name entry.

If the file name isn’t in the current folder of chooser, then the current folder of chooser will be changed to the folder containing file.

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 don’t 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:

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);
    }
}

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.

Modal dialogs prevent interaction with other windows in the same application. To keep modal dialogs on top of main application windows, use [methodGtk.NativeDialog.set_transient_for] to make the dialog transient for the parent; most window managers will then disallow lowering the dialog below the parent.

This is only relevant if the action is set to be %GTK_FILE_CHOOSER_ACTION_OPEN or %GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER.

This allows window managers to e.g. keep the dialog on top of the main window, or center the dialog over the main window.

Passing %NULL for parent unsets the current transient window.

When the user accepts the state of the dialog the dialog will be automatically hidden and the [signalGtk.NativeDialog::response] signal will be emitted.

Multiple calls while the dialog is visible will be ignored.

void
object_add_to_user_list (GObject     *object,
                         const gchar *new_string)
{
  // the quark, naming the object data
  GQuark quark_string_list = g_quark_from_static_string ("my-string-list");
  // retrieve the old string list
  GList *list = g_object_steal_qdata (object, quark_string_list);

  // prepend new string
  list = g_list_prepend (list, g_strdup (new_string));
  // this changed 'list', so we need to set it again
  g_object_set_qdata_full (object, quark_string_list, list, free_string_list);
}
static void
free_string_list (gpointer data)
{
  GList *node, *list = data;

  for (node = list; node; node = node->next)
    g_free (node->data);
  g_list_free (list);
}

Using g_object_get_qdata() in the above example, instead of g_object_steal_qdata() would have left the destroy function set, and thus the partial string list would have been freed upon g_object_set_qdata_full().

Duplicate notifications for each property are squashed so that at most one #GObject::notify signal is emitted for each property, in the reverse order in which they have been queued.

It is an error to call this function when the freeze count is zero.

If the pointer to the #GObject may be reused in future (for example, if it is an instance variable of another object), it is recommended to clear the pointer to %NULL rather than retain a dangling pointer to a potentially invalid #GObject instance. Use g_clear_object() for this.