window_tree_host_observer.h

// Copyright 2014 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_WINDOW_TREE_HOST_OBSERVER_H_
#define UI_AURA_WINDOW_TREE_HOST_OBSERVER_H_

#include "ui/aura/aura_export.h"

namespace gfx {
class Point;
}

namespace aura {
class WindowTreeHost;

class AURA_EXPORT WindowTreeHostObserver {
 public:
  // Called when the host's client size has changed.
  virtual void OnHostResized(const WindowTreeHost* host) {}

  // Called when the host is moved on screen.
  virtual void OnHostMoved(const WindowTreeHost* host,
                           const gfx::Point& new_origin) {}

  // Called when the host is moved to a different workspace.
  virtual void OnHostWorkspaceChanged(const WindowTreeHost* host) {}

  // Called when the native window system sends the host request to close.
  virtual void OnHostCloseRequested(const WindowTreeHost* host) {}

 protected:
  virtual ~WindowTreeHostObserver() {}
};

}  // namespace aura

#endif  // UI_AURA_WINDOW_TREE_HOST_OBSERVER_H_