cacao/appkit/src/file_panel/traits.rs

//! A trait that you can implement to handle open and save file dialogs. This more or less maps
//! over to `NSOpenPanel` and `NSSavePanel` handling.

pub trait OpenSaveController {
    /// Called when the user has entered a filename (typically, during saving). `confirmed`
    /// indicates whether or not they hit the save button.
    fn user_entered_filename(&self, _filename: &str, _confirmed: bool) {}

    /// Notifies you that the panel selection changed.
    fn panel_selection_did_change(&self) {}

    /// Notifies you that the user changed directories.
    fn did_change_to_directory(&self, _url: &str) {}

    /// Notifies you that the Save panel is about to expand or collapse because the user 
    /// clicked the disclosure triangle that displays or hides the file browser.
    fn will_expand(&self, _expanding: bool) {}

    /// Determine whether the specified URL should be enabled in the Open panel.
    fn should_enable_url(&self, _url: &str) -> bool { true }
}