add dpms on/off command

src/state.rs

@@ -7,7 +7,8 @@ use {
             Backend, BackendConnectorState, BackendConnectorStateSerials, BackendDrmDevice,
             BackendEvent, Connector, ConnectorId, ConnectorIds, DrmDeviceId, DrmDeviceIds,
             HardwareCursorUpdate, InputDevice, InputDeviceGroupIds, InputDeviceId, InputDeviceIds,
-            MonitorInfo, transaction::BackendConnectorTransactionError,
+            MonitorInfo,
+            transaction::{BackendConnectorTransactionError, ConnectorTransaction},
         },
         backends::dummy::DummyBackend,
         cli::RunArgs,
@@ -1404,6 +1405,21 @@ impl State {
         }
     }
 
+    pub fn set_connectors_active(
+        self: &Rc<Self>,
+        active: bool,
+    ) -> Result<(), BackendConnectorTransactionError> {
+        let mut tran = ConnectorTransaction::new(self);
+        for connector in self.connectors.lock().values() {
+            let mut state = connector.state.borrow().clone();
+            state.active = active;
+            tran.add(&connector.connector, state)?;
+        }
+        tran.prepare()?.apply()?.commit();
+        self.set_backend_idle(!active);
+        Ok(())
+    }
+
     pub fn root_visible(&self) -> bool {
         !self.idle.backend_idle.get()
     }