Trait gio::prelude::FileEnumeratorExt

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pub trait FileEnumeratorExt: IsA<FileEnumerator> + Sealed + 'static {
    // Provided methods
    fn close(
        &self,
        cancellable: Option<&impl IsA<Cancellable>>
    ) -> Result<(), Error> { ... }
    fn close_async<P: FnOnce(Result<(), Error>) + 'static>(
        &self,
        io_priority: Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P
    ) { ... }
    fn close_future(
        &self,
        io_priority: Priority
    ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>> { ... }
    fn child(&self, info: &FileInfo) -> File { ... }
    fn container(&self) -> File { ... }
    fn has_pending(&self) -> bool { ... }
    fn is_closed(&self) -> bool { ... }
    fn next_file(
        &self,
        cancellable: Option<&impl IsA<Cancellable>>
    ) -> Result<Option<FileInfo>, Error> { ... }
    fn next_files_async<P: FnOnce(Result<Vec<FileInfo>, Error>) + 'static>(
        &self,
        num_files: i32,
        io_priority: Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P
    ) { ... }
    fn next_files_future(
        &self,
        num_files: i32,
        io_priority: Priority
    ) -> Pin<Box_<dyn Future<Output = Result<Vec<FileInfo>, Error>> + 'static>> { ... }
    fn set_pending(&self, pending: bool) { ... }
}
Expand description

Trait containing all FileEnumerator methods.

Implementors

FileEnumerator

Provided Methods§

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fn close( &self, cancellable: Option<&impl IsA<Cancellable>> ) -> Result<(), Error>

Releases all resources used by this enumerator, making the enumerator return IOErrorEnum::Closed on all calls.

This will be automatically called when the last reference is dropped, but you might want to call this function to make sure resources are released as early as possible.

cancellable

optional Cancellable object, None to ignore.

Returns

true on success or false on error.

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fn close_async<P: FnOnce(Result<(), Error>) + 'static>( &self, io_priority: Priority, cancellable: Option<&impl IsA<Cancellable>>, callback: P )

Asynchronously closes the file enumerator.

If cancellable is not None, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error IOErrorEnum::Cancelled will be returned in g_file_enumerator_close_finish().

io_priority

the [I/O priority][io-priority] of the request

cancellable

optional Cancellable object, None to ignore.

callback

a GAsyncReadyCallback to call when the request is satisfied

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fn close_future( &self, io_priority: Priority ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>>

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fn child(&self, info: &FileInfo) -> File

Return a new File which refers to the file named by info in the source directory of self. This function is primarily intended to be used inside loops with next_file().

To use this, FILE_ATTRIBUTE_STANDARD_NAME must have been listed in the attributes list used when creating the FileEnumerator.

This is a convenience method that’s equivalent to:

⚠️ The following code is in C ⚠️

  gchar *name = g_file_info_get_name (info);
  GFile *child = g_file_get_child (g_file_enumerator_get_container (enumr),
                                   name);
info

a FileInfo gotten from next_file() or the async equivalents.

Returns

a File for the FileInfo passed it.

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fn container(&self) -> File

Get the File container which is being enumerated.

Returns

the File which is being enumerated.

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fn has_pending(&self) -> bool

Checks if the file enumerator has pending operations.

Returns

true if the self has pending operations.

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fn is_closed(&self) -> bool

Checks if the file enumerator has been closed.

Returns

true if the self is closed.

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fn next_file( &self, cancellable: Option<&impl IsA<Cancellable>> ) -> Result<Option<FileInfo>, Error>

Returns information for the next file in the enumerated object. Will block until the information is available. The FileInfo returned from this function will contain attributes that match the attribute string that was passed when the FileEnumerator was created.

See the documentation of FileEnumerator for information about the order of returned files.

On error, returns None and sets error to the error. If the enumerator is at the end, None will be returned and error will be unset.

cancellable

optional Cancellable object, None to ignore.

Returns

A FileInfo or None on error or end of enumerator. Free the returned object with g_object_unref() when no longer needed.

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fn next_files_async<P: FnOnce(Result<Vec<FileInfo>, Error>) + 'static>( &self, num_files: i32, io_priority: Priority, cancellable: Option<&impl IsA<Cancellable>>, callback: P )

Request information for a number of files from the enumerator asynchronously. When all I/O for the operation is finished the callback will be called with the requested information.

See the documentation of FileEnumerator for information about the order of returned files.

Once the end of the enumerator is reached, or if an error occurs, the callback will be called with an empty list. In this case, the previous call to next_files_async() will typically have returned fewer than num_files items.

If a request is cancelled the callback will be called with IOErrorEnum::Cancelled.

This leads to the following pseudo-code usage:

g_autoptr(GFile) dir = get_directory ();
g_autoptr(GFileEnumerator) enumerator = NULL;
g_autolist(GFileInfo) files = NULL;
g_autoptr(GError) local_error = NULL;

enumerator = yield g_file_enumerate_children_async (dir,
                                                    G_FILE_ATTRIBUTE_STANDARD_NAME ","
                                                    G_FILE_ATTRIBUTE_STANDARD_TYPE,
                                                    G_FILE_QUERY_INFO_NONE,
                                                    G_PRIORITY_DEFAULT,
                                                    cancellable,
                                                    …,
                                                    &local_error);
if (enumerator == NULL)
  g_error ("Error enumerating: %s", local_error->message);

// Loop until no files are returned, either because the end of the enumerator
// has been reached, or an error was returned.
do
  {
    files = yield g_file_enumerator_next_files_async (enumerator,
                                                      5,  // number of files to request
                                                      G_PRIORITY_DEFAULT,
                                                      cancellable,
                                                      …,
                                                      &local_error);

    // Process the returned files, but don’t assume that exactly 5 were returned.
    for (GList *l = files; l != NULL; l = l->next)
      {
        GFileInfo *info = l->data;
        handle_file_info (info);
      }
  }
while (files != NULL);

if (local_error != NULL &&
    !g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
  g_error ("Error while enumerating: %s", local_error->message);

During an async request no other sync and async calls are allowed, and will result in IOErrorEnum::Pending errors.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

num_files

the number of file info objects to request

io_priority

the [I/O priority][io-priority] of the request

cancellable

optional Cancellable object, None to ignore.

callback

a GAsyncReadyCallback to call when the request is satisfied

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fn next_files_future( &self, num_files: i32, io_priority: Priority ) -> Pin<Box_<dyn Future<Output = Result<Vec<FileInfo>, Error>> + 'static>>

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fn set_pending(&self, pending: bool)

Sets the file enumerator as having pending operations.

pending

a boolean value.

Object Safety§

This trait is not object safe.

Implementors§