Library: Port 'Select Folder' to Python (#771)

Co-authored-by: Marco Capypara Köpcke <hello@capypara.de>

Author: gregorni

src/Library/demos/Select Folder/main.py

@@ -0,0 +1,43 @@
+import gi
+
+gi.require_version("Gtk", "4.0")
+from gi.repository import Gio, Gtk
+import workbench
+
+
+button_single = workbench.builder.get_object("button_single")
+button_multiple = workbench.builder.get_object("button_multiple")
+
+
+def on_single_selected(dialog, result):
+    file = dialog.select_folder_finish(result)
+    info = file.query_info(
+        "standard::name",
+        Gio.FileQueryInfoFlags.NONE,
+        None,
+    )
+    print(f'"{info.get_name()}" selected')
+
+
+def select_folder(button):
+    dialog_for_folder = Gtk.FileDialog()
+    dialog_for_folder.select_folder(workbench.window, None, on_single_selected)
+
+
+button_single.connect("clicked", select_folder)
+
+
+def on_multiple_selected(dialog, result):
+    folders = dialog.select_multiple_folders_finish(result)
+    selected_items_count = folders.get_n_items()
+    print(f"{selected_items_count} selected folders")
+
+
+def select_multiple_folders(button):
+    dialog_for_folders = Gtk.FileDialog()
+    dialog_for_folders.select_multiple_folders(
+        workbench.window, None, on_multiple_selected
+    )
+
+
+button_multiple.connect("clicked", select_multiple_folders)