components/view_manager/server_view_delegate.h

   1 // Copyright 2014 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_VIEW_MANAGER_SERVER_VIEW_DELEGATE_H_
   6 #define COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DELEGATE_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "components/view_manager/public/interfaces/compositor_frame.mojom.h"
  10 #include "components/view_manager/public/interfaces/view_manager_constants.mojom.h"
  11
  12 namespace cc {
  13 class CompositorFrame;
  14 }
  15
  16 namespace gfx {
  17 class Rect;
  18 }
  19
  20 namespace mojo {
  21 class ViewportMetrics;
  22 }
  23
  24 namespace surfaces {
  25 class SurfacesState;
  26 }
  27
  28 namespace view_manager {
  29
  30 class ServerView;
  31
  32 // ServerViewDelegate is notified at key points in the lifetime of a
  33 // ServerView. Some of the functions are similar to that of
  34 // ServerViewObserver. For example, ServerViewDelegate::PrepareToDestroyView()
  35 // and ServerViewObserver::OnWillDestroyView(). The key difference between
  36 // the two are the ServerViewDelegate ones are always notified first, and
  37 // ServerViewDelegate gets non-const arguments.
  38 class ServerViewDelegate {
  39  public:
  40   virtual scoped_ptr<cc::CompositorFrame> UpdateViewTreeFromCompositorFrame(
  41       const mojo::CompositorFramePtr& input) = 0;
  42
  43   virtual surfaces::SurfacesState* GetSurfacesState() = 0;
  44
  45   // Invoked when a view is about to be destroyed; before any of the children
  46   // have been removed and before the view has been removed from its parent.
  47   virtual void PrepareToDestroyView(ServerView* view) = 0;
  48
  49   virtual void PrepareToChangeViewHierarchy(ServerView* view,
  50                                             ServerView* new_parent,
  51                                             ServerView* old_parent) = 0;
  52
  53   virtual void PrepareToChangeViewVisibility(ServerView* view) = 0;
  54
  55   virtual void OnScheduleViewPaint(const ServerView* view) = 0;
  56
  57   // Returns the root of the view tree to which this |view| is attached. Returns
  58   // null if this view is not attached up through to a root view.
  59   virtual const ServerView* GetRootView(const ServerView* view) const = 0;
  60
  61  protected:
  62   virtual ~ServerViewDelegate() {}
  63 };
  64
  65 }  // namespace view_manager
  66
  67 #endif  // COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DELEGATE_H_