apps/app_launcher.h

   1 // Copyright 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 CHROME_APPS_APP_LAUNCHER_H_
   6 #define CHROME_APPS_APP_LAUNCHER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback_forward.h"
  10
  11 class PrefRegistrySimple;
  12
  13 namespace apps {
  14
  15 // Called on the UI thread after determining if the launcher is enabled. A
  16 // boolean flag is passed, which is true if the app launcher is enabled.
  17 typedef base::Callback<void(bool)> OnAppLauncherEnabledCompleted;
  18
  19 // A synchronous check to determine if the app launcher is enabled. If the
  20 // registry needs to be determined to find an accurate answer, this function
  21 // will NOT do so; instead if will default to false (the app launcher is not
  22 // enabled).
  23 // This function does not use the cached preference of whether the launcher
  24 // was enabled or not.
  25 bool MaybeIsAppLauncherEnabled();
  26
  27 // Determine whether the app launcher is enabled or not. This may involve a trip
  28 // to a blocking thread. |completion_callback| is called when an answer is
  29 // ready. This needs to be called on the UI thread.
  30 void GetIsAppLauncherEnabled(
  31     const OnAppLauncherEnabledCompleted& completion_callback);
  32
  33 // Returns whether the app launcher was enabled the last time it was checked.
  34 bool WasAppLauncherEnabled();
  35
  36 }  // namespace extensions
  37
  38 #endif  // CHROME_APPS_APP_LAUNCHER_H_