components/mus/display_manager_delegate.h

   1 // Copyright 2015 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 COMPONENTS_MUS_DISPLAY_MANAGER_DELEGATE_H_
   6 #define COMPONENTS_MUS_DISPLAY_MANAGER_DELEGATE_H_
   7
   8 #include "components/mus/ids.h"
   9 #include "components/mus/public/interfaces/view_tree.mojom.h"
  10
  11 namespace mus {
  12
  13 class ServerView;
  14
  15 // A DisplayManagerDelegate an interface to be implemented by an object that
  16 // manages the lifetime of a DisplayManager, forwards events to the appropriate
  17 // views, and responses to changes in viewport size.
  18 class DisplayManagerDelegate {
  19  public:
  20   // Returns the root view of this display.
  21   virtual ServerView* GetRootView() = 0;
  22
  23   // Called when the window managed by the DisplayManager is closed.
  24   virtual void OnDisplayClosed() = 0;
  25
  26   // Called when an event arrives.
  27   virtual void OnEvent(ViewId id, mojo::EventPtr event) = 0;
  28
  29   // Signals that the metrics of this display's viewport has changed.
  30   virtual void OnViewportMetricsChanged(
  31       const mojo::ViewportMetrics& old_metrics,
  32       const mojo::ViewportMetrics& new_metrics) = 0;
  33
  34  protected:
  35   virtual ~DisplayManagerDelegate() {}
  36 };
  37
  38 }  // namespace mus
  39
  40 #endif  // COMPONENTS_MUS_DISPLAY_MANAGER_DELEGATE_H_