ui/aura/client/window_stacking_client.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 UI_AURA_CLIENT_WINDOW_STACKING_CLIENT_H_
   6 #define UI_AURA_CLIENT_WINDOW_STACKING_CLIENT_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "ui/aura/aura_export.h"
  11 #include "ui/aura/window.h"
  12
  13 namespace aura {
  14 namespace client {
  15
  16 class AURA_EXPORT WindowStackingClient {
  17  public:
  18   // Invoked from the various Window stacking functions. Allows the
  19   // WindowStackingClient to alter the source, target and/or direction to stack.
  20   // Returns true if stacking should continue; false if the stacking should not
  21   // happen.
  22   virtual bool AdjustStacking(Window** child,
  23                               Window** target,
  24                               Window::StackDirection* direction) = 0;
  25
  26  protected:
  27   virtual ~WindowStackingClient() {}
  28 };
  29
  30 // Sets/gets the WindowStackingClient. This does *not* take ownership of
  31 // |client|. It is assumed the caller will invoke SetWindowStackingClient(NULL)
  32 // before deleting |client|.
  33 AURA_EXPORT void SetWindowStackingClient(WindowStackingClient* client);
  34 AURA_EXPORT WindowStackingClient* GetWindowStackingClient();
  35
  36 }  // namespace client
  37 }  // namespace aura
  38
  39 #endif  // UI_AURA_CLIENT_WINDOW_STACKING_CLIENT_H_