open

Description:

public async File? open (Window? parent, Cancellable? cancellable) throws Error

Presents a file chooser dialog to the user.

The file chooser dialog will be set up to select a single file.

The callback will be called when the dialog is dismissed.

this	a file dialog
parent	the parent window
cancellable	a cancellable to cancel the operation
callback	a callback to call when the operation is complete
user_data	data to pass to `callback`