// 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 UI_AURA_CLIENT_CAPTURE_CLIENT_H_
#define UI_AURA_CLIENT_CAPTURE_CLIENT_H_

#include "ui/aura/aura_export.h"

namespace aura {
class RootWindow;
class Window;

namespace client {

// An interface implemented by an object that manages input capture.
class AURA_EXPORT CaptureClient {
 public:
  // Does a capture on the |window|.
  virtual void SetCapture(Window* window) = 0;

  // Releases a capture from the |window|.
  virtual void ReleaseCapture(Window* window) = 0;

  // Returns the current capture window.
  virtual Window* GetCaptureWindow() = 0;

 protected:
  virtual ~CaptureClient() {}
};

// Sets/Gets the capture client on the RootWindow.
AURA_EXPORT void SetCaptureClient(RootWindow* root_window,
                                  CaptureClient* client);
AURA_EXPORT CaptureClient* GetCaptureClient(RootWindow* root_window);

// A utility function to get the current capture window. Returns NULL
// if the window doesn't have a root window, or there is no capture window.
AURA_EXPORT Window* GetCaptureWindow(Window* window);

}  // namespace clients
}  // namespace aura

#endif  // UI_AURA_CLIENT_CAPTURE_CLIENT_H_