chromeos: Add support for dimming the screen.

chromeos/dbus/power_manager_client.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/dbus/power_manager_client.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 93 matching lines @@
         base::Bind(&PowerManagerClientImpl::SignalConnected,
                    weak_ptr_factory_.GetWeakPtr()));
 
     power_manager_proxy_->ConnectToSignal(
         power_manager::kPowerManagerInterface,
         power_manager::kActiveNotifySignal,
         base::Bind(&PowerManagerClientImpl::ActiveNotifySignalReceived,
                    weak_ptr_factory_.GetWeakPtr()),
         base::Bind(&PowerManagerClientImpl::SignalConnected,
                    weak_ptr_factory_.GetWeakPtr()));
+
+    power_manager_proxy_->ConnectToSignal(
+        power_manager::kPowerManagerInterface,
+        power_manager::kSoftwareScreenDimmingRequestedSignal,
+        base::Bind(
+            &PowerManagerClientImpl::SoftwareScreenDimmingRequestedReceived,
+            weak_ptr_factory_.GetWeakPtr()),
+        base::Bind(&PowerManagerClientImpl::SignalConnected,
+                   weak_ptr_factory_.GetWeakPtr()));
   }
 
   virtual ~PowerManagerClientImpl() {
   }
 
   // PowerManagerClient overrides:
 
   virtual void AddObserver(Observer* observer) OVERRIDE {
     CHECK(observer);  // http://crbug.com/119976
     observers_.AddObserver(observer);
@@ skipping 304 matching lines @@
   }
 
   void ScreenUnlockSignalReceived(dbus::Signal* signal) {
     FOR_EACH_OBSERVER(Observer, observers_, UnlockScreen());
   }
 
   void ScreenUnlockFailedSignalReceived(dbus::Signal* signal) {
     FOR_EACH_OBSERVER(Observer, observers_, UnlockScreenFailed());
   }
 
-
   void IdleNotifySignalReceived(dbus::Signal* signal) {
     dbus::MessageReader reader(signal);
     int64 threshold = 0;
     if (!reader.PopInt64(&threshold)) {
       LOG(ERROR) << "Idle Notify signal had incorrect parameters: "
                  << signal->ToString();
       return;
     }
     DCHECK_GT(threshold, 0);
 
     VLOG(1) << "Idle Notify: " << threshold;
     FOR_EACH_OBSERVER(Observer, observers_, IdleNotify(threshold));
   }
 
   void ActiveNotifySignalReceived(dbus::Signal* signal) {
     dbus::MessageReader reader(signal);
     int64 threshold = 0;
     if (!reader.PopInt64(&threshold)) {
       LOG(ERROR) << "Active Notify signal had incorrect parameters: "
                  << signal->ToString();
       return;
     }
     DCHECK_EQ(threshold, 0);
 
     VLOG(1) << "Active Notify.";
     FOR_EACH_OBSERVER(Observer, observers_, ActiveNotify());
   }
 
+  void SoftwareScreenDimmingRequestedReceived(dbus::Signal* signal) {
+    dbus::MessageReader reader(signal);
+    int32 signal_state = 0;
+    if (!reader.PopInt32(&signal_state)) {
+      LOG(ERROR) << "Screen dimming signal had incorrect parameters: "
+                 << signal->ToString();
+      return;
+    }
+
+    Observer::ScreenDimmingState state = Observer::SCREEN_DIMMING_NONE;
+    switch (signal_state) {
+      case power_manager::kSoftwareScreenDimmingNone:
+        state = Observer::SCREEN_DIMMING_NONE;
+        break;
+      case power_manager::kSoftwareScreenDimmingIdle:
+        state = Observer::SCREEN_DIMMING_IDLE;
+        break;
+      default:
+        LOG(ERROR) << "Unhandled screen dimming state " << signal_state;
+    }
+    FOR_EACH_OBSERVER(Observer, observers_, ScreenDimmingRequested(state));
+  }
 
   dbus::ObjectProxy* power_manager_proxy_;
   dbus::ObjectProxy* session_manager_proxy_;
   ObserverList<Observer> observers_;
   base::WeakPtrFactory<PowerManagerClientImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerManagerClientImpl);
 };
 
 // The PowerManagerClient implementation used on Linux desktop,
@@ skipping 136 matching lines @@
 PowerManagerClient* PowerManagerClient::Create(
     DBusClientImplementationType type,
     dbus::Bus* bus) {
   if (type == REAL_DBUS_CLIENT_IMPLEMENTATION)
     return new PowerManagerClientImpl(bus);
   DCHECK_EQ(STUB_DBUS_CLIENT_IMPLEMENTATION, type);
   return new PowerManagerClientStubImpl();
 }
 
 }  // namespace chromeos