chromeos: Request screen lock directly from session manager.

chromeos/dbus/session_manager_client.h

 // 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.
 
 #ifndef CHROMEOS_DBUS_SESSION_MANAGER_CLIENT_H_
 #define CHROMEOS_DBUS_SESSION_MANAGER_CLIENT_H_
 
 #include "base/callback.h"
 #include "base/observer_list.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/dbus/dbus_client_implementation_type.h"
 
 #include <string>
 
 namespace dbus {
 class Bus;
 }  // namespace
 
 namespace chromeos {
 
 // SessionManagerClient is used to communicate with the session manager.
 class CHROMEOS_EXPORT SessionManagerClient {
  public:
   // Interface for observing changes from the session manager.
   class Observer {
    public:
     // Called when the owner key is set.
     virtual void OwnerKeySet(bool success) {}
+
     // Called when the property change is complete.
     virtual void PropertyChangeComplete(bool success) {}
+
+    // Called when the screen is locked.
+    virtual void LockScreen() {}
+
+    // Called when the screen is unlocked.
+    virtual void UnlockScreen() {}
+
   };
 
   // Adds and removes the observer.
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
+  virtual bool HasObserver(Observer* observer) = 0;
 
   // Kicks off an attempt to emit the "login-prompt-ready" upstart signal.
   virtual void EmitLoginPromptReady() = 0;
 
   // Kicks off an attempt to emit the "login-prompt-visible" upstart signal.
   virtual void EmitLoginPromptVisible() = 0;
 
   // Restarts a job referenced by |pid| with the provided command line.
   virtual void RestartJob(int pid, const std::string& command_line) = 0;
 
   // Restarts entd (the enterprise daemon).
   // DEPRECATED: will be deleted soon.
   virtual void RestartEntd() = 0;
 
   // Starts the session for the user.
   virtual void StartSession(const std::string& user_email) = 0;
 
   // Stops the current session.
   virtual void StopSession() = 0;
 
+  // Locks the screen.
+  virtual void RequestLockScreen() = 0;

[oshima, 2012/07/06 17:31:12]

will a lock request never fail?

[Daniel Erat, 2012/07/09 16:01:42]

There's no way to report failure currently.  This is another issue with the way
that screen-locking currently works; I'll post a more detailed explanation of
the current state and the way that things should work instead in the bug after
this change is in.

+
+  // Unlocks the screen.
+  virtual void RequestUnlockScreen() = 0;
+
+  // Returns whether or not the screen is locked. Implementation should cache
+  // this state so that it can return immediately. Useful for observers that
+  // need to know the current screen lock state when they are added.
+  virtual bool GetIsScreenLocked() = 0;
+
   // Used for RetrieveDevicePolicy and RetrieveUserPolicy. Takes a serialized
   // protocol buffer as string.  Upon success, we will pass a protobuf to the
   // callback.  On failure, we will pass "".
   typedef base::Callback<void(const std::string&)> RetrievePolicyCallback;
 
   // Fetches the device policy blob stored by the session manager.  Upon
   // completion of the retrieve attempt, we will call the provided callback.
   virtual void RetrieveDevicePolicy(const RetrievePolicyCallback& callback) = 0;
 
   // Fetches the user policy blob stored by the session manager for the
@@ skipping 26 matching lines @@
   // Create() should be used instead.
   SessionManagerClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SessionManagerClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_SESSION_MANAGER_CLIENT_H_