components/view_manager/display_manager_delegate.h

// Copyright 2015 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 COMPONENTS_VIEW_MANAGER_DISPLAY_MANAGER_DELEGATE_H_
#define COMPONENTS_VIEW_MANAGER_DISPLAY_MANAGER_DELEGATE_H_

#include "components/view_manager/public/interfaces/view_manager.mojom.h"

namespace view_manager {

class ServerView;

// A DisplayManagerDelegate an interface to be implemented by an object that
// manages the lifetime of a DisplayManager, forwards events to the appropriate
// views, and responses to changes in viewport size.
class DisplayManagerDelegate {
 public:
  // Returns the root view of this display.
  virtual ServerView* GetRootView() = 0;

  // Called when the window managed by the DisplayManager is closed.
  virtual void OnDisplayClosed() = 0;

  // Called when an event arrives.
  virtual void OnEvent(mojo::EventPtr event) = 0;

  // Signals that the metrics of this display's viewport has changed.
  virtual void OnViewportMetricsChanged(
      const mojo::ViewportMetrics& old_metrics,
      const mojo::ViewportMetrics& new_metrics) = 0;

 protected:
  virtual ~DisplayManagerDelegate() {}
};

}  // namespace view_manager

#endif  // COMPONENTS_VIEW_MANAGER_DISPLAY_MANAGER_DELEGATE_H_