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extern crate dbus;
// Tracks currently focused window under the Unity desktop by listening to the
// FocusedWindowChanged signal. The signal contains "window_id", "app_id" and "stage",
// we print only "app_id".
use dbus::{ffidisp::Connection, Message, MessageType};
fn focus_msg(msg: &Message) -> Option<&str> {
if msg.msg_type() != MessageType::Signal { return None };
if &*msg.interface().unwrap() != "com.canonical.Unity.WindowStack" { return None };
if &*msg.member().unwrap() != "FocusedWindowChanged" { return None };
let (_, app) = msg.get2::<u32, &str>();
app
}
fn main() {
let c = Connection::new_session().unwrap();
c.add_match("interface='com.canonical.Unity.WindowStack',member='FocusedWindowChanged'").unwrap();
loop {
if let Some(msg) = c.incoming(1000).next() {
if let Some(app) = focus_msg(&msg) {
println!("{} has now focus.", app);
}
}
}
}
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