Struct gtk4::FileChooserNative

source ·
#[repr(transparent)]
pub struct FileChooserNative { /* private fields */ }
Expand description

FileChooserNative is an abstraction of a dialog suitable for use with “File Open” or “File Save as” commands.

By default, this just uses a FileChooserDialog to implement the actual dialog. However, on some platforms, such as Windows and macOS, the native platform file chooser is used instead. When the application is running in a sandboxed environment without direct filesystem access (such as Flatpak), FileChooserNative may call the proper APIs (portals) to let the user choose a file and make it available to the application.

While the API of FileChooserNative closely mirrors FileChooserDialog, the main difference is that there is no access to any Window or Widget for the dialog. This is required, as there may not be one in the case of a platform native dialog.

Showing, hiding and running the dialog is handled by the NativeDialog functions.

Note that unlike FileChooserDialog, FileChooserNative objects are not toplevel widgets, and GTK does not keep them alive. It is your responsibility to keep a reference until you are done with the object.

Typical usage

In the simplest of cases, you can the following code to use FileChooserNative to select a file for opening:

⚠️ The following code is in c ⚠️

static void
on_response (GtkNativeDialog *native,
             int              response)
{
  if (response == GTK_RESPONSE_ACCEPT)
    {
      GtkFileChooser *chooser = GTK_FILE_CHOOSER (native);
      GFile *file = gtk_file_chooser_get_file (chooser);

      open_file (file);

      g_object_unref (file);
    }

  g_object_unref (native);
}

  // ...
  GtkFileChooserNative *native;
  GtkFileChooserAction action = GTK_FILE_CHOOSER_ACTION_OPEN;

  native = gtk_file_chooser_native_new ("Open File",
                                        parent_window,
                                        action,
                                        "_Open",
                                        "_Cancel");

  g_signal_connect (native, "response", G_CALLBACK (on_response), NULL);
  gtk_native_dialog_show (GTK_NATIVE_DIALOG (native));

To use a FileChooserNative for saving, you can use this:

⚠️ The following code is in c ⚠️

static void
on_response (GtkNativeDialog *native,
             int              response)
{
  if (response == GTK_RESPONSE_ACCEPT)
    {
      GtkFileChooser *chooser = GTK_FILE_CHOOSER (native);
      GFile *file = gtk_file_chooser_get_file (chooser);

      save_to_file (file);

      g_object_unref (file);
    }

  g_object_unref (native);
}

  // ...
  GtkFileChooserNative *native;
  GtkFileChooser *chooser;
  GtkFileChooserAction action = GTK_FILE_CHOOSER_ACTION_SAVE;

  native = gtk_file_chooser_native_new ("Save File",
                                        parent_window,
                                        action,
                                        "_Save",
                                        "_Cancel");
  chooser = GTK_FILE_CHOOSER (native);

  if (user_edited_a_new_document)
    gtk_file_chooser_set_current_name (chooser, _("Untitled document"));
  else
    gtk_file_chooser_set_file (chooser, existing_file, NULL);

  g_signal_connect (native, "response", G_CALLBACK (on_response), NULL);
  gtk_native_dialog_show (GTK_NATIVE_DIALOG (native));

For more information on how to best set up a file dialog, see the FileChooserDialog documentation.

Response Codes

FileChooserNative inherits from NativeDialog, which means it will return ResponseType::Accept if the user accepted, and ResponseType::Cancel if he pressed cancel. It can also return ResponseType::DeleteEvent if the window was unexpectedly closed.

Differences from FileChooserDialog

There are a few things in the FileChooser interface that are not possible to use with FileChooserNative, as such use would prohibit the use of a native dialog.

No operations that change the dialog work while the dialog is visible. Set all the properties that are required before showing the dialog.

Win32 details

On windows the IFileDialog implementation (added in Windows Vista) is used. It supports many of the features that FileChooser has, but there are some things it does not handle:

If any of these features are used the regular FileChooserDialog will be used in place of the native one.

Portal details

When the org.freedesktop.portal.FileChooser portal is available on the session bus, it is used to bring up an out-of-process file chooser. Depending on the kind of session the application is running in, this may or may not be a GTK file chooser.

macOS details

On macOS the NSSavePanel and NSOpenPanel classes are used to provide native file chooser dialogs. Some features provided by FileChooser are not supported:

  • Shortcut folders.

Implements

NativeDialogExt, glib::ObjectExt, FileChooserExt, NativeDialogExtManual, FileChooserExtManual

Implementations

Creates a new FileChooserNative.

title

Title of the native

parent

Transient parent of the native

action

Open or save mode for the dialog

accept_label

text to go in the accept button, or None for the default

cancel_label

text to go in the cancel button, or None for the default

Returns

a new FileChooserNative

Creates a new builder-pattern struct instance to construct FileChooserNative objects.

This method returns an instance of FileChooserNativeBuilder which can be used to create FileChooserNative objects.

Retrieves the custom label text for the accept button.

Returns

The custom label

Retrieves the custom label text for the cancel button.

Returns

The custom label

Sets the custom label text for the accept button.

If characters in @label are preceded by an underscore, they are underlined. If you need a literal underscore character in a label, use “__” (two underscores). The first underlined character represents a keyboard accelerator called a mnemonic.

Pressing Alt and that key should activate the button.

accept_label

custom label

Sets the custom label text for the cancel button.

If characters in @label are preceded by an underscore, they are underlined. If you need a literal underscore character in a label, use “__” (two underscores). The first underlined character represents a keyboard accelerator called a mnemonic.

Pressing Alt and that key should activate the button.

cancel_label

custom label

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