ash/wm/window_state_observer.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 ASH_WM_WINDOW_STATE_OBSERVER_H_
   6 #define ASH_WM_WINDOW_STATE_OBSERVER_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "ash/wm/wm_types.h"
  10
  11 namespace ash {
  12 namespace wm {
  13 class WindowState;
  14
  15 class ASH_EXPORT WindowStateObserver {
  16  public:
  17   // Following observer methods are different from kWindowShowStatekey
  18   // property change as they will be invoked when the window
  19   // gets left/right maximized, and auto positioned. |old_type| is the value
  20   // before the change.
  21
  22   // Called after the window's state type is set to new type, but before
  23   // the window's bounds has been updated for the new type.
  24   // This is used to update the shell state such as work area so
  25   // that the window can use the correct environment to update its bounds.
  26   // TODO(oshima): Remove this once docked windows has its own state.
  27   virtual void OnPreWindowStateTypeChange(WindowState* window_state,
  28                                           WindowStateType old_type) {}
  29
  30   // Called after the window's state has been updated.
  31   // This is used to update the shell state that depends on the updated
  32   // window bounds, such as shelf visibility.
  33   virtual void OnPostWindowStateTypeChange(WindowState* window_state,
  34                                            WindowStateType old_type) {}
  35 };
  36
  37 }  // namespace wm
  38 }  // namespace ash
  39
  40 #endif  // ASH_WM_WINDOW_STATE_OBSERVER_H_