ui/aura/env_observer.h

   1 // Copyright (c) 2012 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 UI_AURA_ENV_OBSERVER_H_
   6 #define UI_AURA_ENV_OBSERVER_H_
   7
   8 #include "ui/aura/aura_export.h"
   9
  10 namespace aura {
  11
  12 class Window;
  13 class WindowTreeHost;
  14
  15 class AURA_EXPORT EnvObserver {
  16  public:
  17   // Called when |window| has been initialized.
  18   virtual void OnWindowInitialized(Window* window) = 0;
  19
  20  // Called when a WindowTreeHost is initialized.
  21  virtual void OnHostInitialized(WindowTreeHost* host) {};
  22
  23   // Called when a WindowTreeHost is activated.
  24   virtual void OnHostActivated(WindowTreeHost* host) {}
  25
  26   // Called right before Env is destroyed.
  27   virtual void OnWillDestroyEnv() {}
  28
  29  protected:
  30   virtual ~EnvObserver() {}
  31 };
  32
  33 }  // namespace aura
  34
  35 #endif  // UI_AURA_ENV_OBSERVER_H_