Lock session on screen blanking

src/fade_black.rs

@@ -137,6 +137,11 @@ impl Dispatch<wl_callback::WlCallback, wl_surface::WlSurface> for State {
                                     .output_power
                                     .set_mode(zwlr_output_power_v1::Mode::Off);
                                 output.fade_surface = None;
+
+                                // All outputs are done fading
+                                if state.outputs.iter().all(|o| o.fade_surface.is_none()) {
+                                    state.fade_done();
+                                }
                             } else {
                                 fade_surface.update(&state.inner);
                             }

src/main.rs

@@ -148,6 +148,16 @@ impl State {
         }
     }
 
+    // Fade surfaces on all outputs have finished fading out
+    fn fade_done(&mut self) {
+        if let Some(command) = self
+            .system_actions
+            .get(&shortcuts::action::System::LockScreen)
+        {
+            crate::run_command(command.to_string());
+        }
+    }
+
     fn update_suspend_idle(&mut self, is_idle: bool) {
         if is_idle {
             // TODO: Make command configurable