chromeos/dbus/services/display_power_service_provider.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROMEOS_DBUS_SERVICES_DISPLAY_POWER_SERVICE_PROVIDER_H_
   6 #define CHROMEOS_DBUS_SERVICES_DISPLAY_POWER_SERVICE_PROVIDER_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "chromeos/chromeos_export.h"
  16 #include "chromeos/dbus/services/cros_dbus_service.h"
  17 #include "dbus/exported_object.h"
  18 #include "third_party/cros_system_api/dbus/service_constants.h"
  19
  20 namespace dbus {
  21 class MethodCall;
  22 }
  23
  24 namespace chromeos {
  25
  26 // This class exports "SetDisplayPower" and "SetDisplaySoftwareDimming"
  27 // D-Bus methods that the power manager calls to instruct Chrome to turn
  28 // various displays on or off or dim them.
  29 class CHROMEOS_EXPORT DisplayPowerServiceProvider
  30     : public CrosDBusService::ServiceProviderInterface {
  31  public:
  32   class Delegate {
  33    public:
  34     typedef base::Callback<void(bool)> ResponseCallback;
  35
  36     virtual ~Delegate() {}
  37
  38     // Sets the display power state. After the display power is set, |callback|
  39     // is called with the operation status.
  40     virtual void SetDisplayPower(DisplayPowerState power_state,
  41                                  const ResponseCallback& callback) = 0;
  42
  43     // Dims or undims the screen.
  44     virtual void SetDimming(bool dimmed) = 0;
  45   };
  46
  47   explicit DisplayPowerServiceProvider(scoped_ptr<Delegate> delegate);
  48   ~DisplayPowerServiceProvider() override;
  49
  50   // CrosDBusService::ServiceProviderInterface overrides:
  51   void Start(scoped_refptr<dbus::ExportedObject> exported_object) override;
  52
  53  private:
  54   // Called from ExportedObject when a handler is exported as a D-Bus
  55   // method or failed to be exported.
  56   void OnExported(const std::string& interface_name,
  57                   const std::string& method_name,
  58                   bool success);
  59
  60   // Called on UI thread in response to D-Bus requests.
  61   void SetDisplayPower(dbus::MethodCall* method_call,
  62                        dbus::ExportedObject::ResponseSender response_sender);
  63   void SetDisplaySoftwareDimming(
  64       dbus::MethodCall* method_call,
  65       dbus::ExportedObject::ResponseSender response_sender);
  66
  67   scoped_ptr<Delegate> delegate_;
  68
  69   // Keep this last so that all weak pointers will be invalidated at the
  70   // beginning of destruction.
  71   base::WeakPtrFactory<DisplayPowerServiceProvider> weak_ptr_factory_;
  72
  73   DISALLOW_COPY_AND_ASSIGN(DisplayPowerServiceProvider);
  74 };
  75
  76 }  // namespace chromeos
  77
  78 #endif  // CHROMEOS_DBUS_SERVICES_DISPLAY_POWER_SERVICE_PROVIDER_H_