Rust Programming By Example

With different widgets

Let's update the open() method to communicate with the playlist:

impl App {
    fn open(&self) {
        let file = show_open_dialog(&self.window);
        if let Some(file) = file {
            let ext = file.extension().map(|ext| ext.to_str().unwrap().to_string());
            if let Some(ext) = ext {
                match ext.as_str() {
                    "mp3" => self.playlist.emit(AddSong(file)),
                    "m3u" => self.playlist.emit(LoadSong(file)),
                    extension => {
                        let dialog = MessageDialog::new(Some(&self.window),                          DialogFlags::empty(), MessageType::Error,
                        ButtonsType::Ok, &format!("Cannot open file with                          extension . {}", extension));
                        dialog.run();
                        dialog.destroy();
                    },
                }
            }
        }
    }
}

So, we call the same emit() method to send a message to another widget:

self.playlist.emit(AddSong(file))

Here, we sent ...