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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::{Connection, BusType, ConnectionItem};
fn focus_msg(ci: &ConnectionItem) -> Option<&str> {
let m = if let &ConnectionItem::Signal(ref s) = ci { s } else { return None };
if &*m.interface().unwrap() != "com.canonical.Unity.WindowStack" { return None };
if &*m.member().unwrap() != "FocusedWindowChanged" { return None };
let (_, app) = m.get2::<u32, &str>();
app
}
fn main() {
let c = Connection::get_private(BusType::Session).unwrap();
c.add_match("interface='com.canonical.Unity.WindowStack',member='FocusedWindowChanged'").unwrap();
for i in c.iter(1000) {
if let Some(app) = focus_msg(&i) { println!("{} has now focus.", app) };
}
}