src/mojo/services/public/cpp/view_manager/node_observer.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 MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_NODE_OBSERVER_H_
   6 #define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_NODE_OBSERVER_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11
  12 #include "mojo/services/public/cpp/view_manager/node.h"
  13
  14 namespace gfx {
  15 class Rect;
  16 }
  17
  18 namespace mojo {
  19 namespace view_manager {
  20
  21 class Node;
  22 class View;
  23
  24 class NodeObserver {
  25  public:
  26   enum DispositionChangePhase {
  27     DISPOSITION_CHANGING,
  28     DISPOSITION_CHANGED
  29   };
  30
  31   struct TreeChangeParams {
  32     TreeChangeParams();
  33     Node* target;
  34     Node* old_parent;
  35     Node* new_parent;
  36     Node* receiver;
  37     DispositionChangePhase phase;
  38   };
  39
  40   virtual void OnTreeChange(const TreeChangeParams& params) {}
  41
  42   virtual void OnNodeReordered(Node* node,
  43                                Node* relative_node,
  44                                OrderDirection direction,
  45                                DispositionChangePhase phase) {}
  46
  47   virtual void OnNodeDestroy(Node* node, DispositionChangePhase phase) {}
  48
  49   virtual void OnNodeActiveViewChange(Node* node,
  50                                       View* old_view,
  51                                       View* new_view,
  52                                       DispositionChangePhase phase) {}
  53
  54   virtual void OnNodeBoundsChange(Node* node,
  55                                   const gfx::Rect& old_bounds,
  56                                   const gfx::Rect& new_bounds,
  57                                   DispositionChangePhase phase) {}
  58
  59  protected:
  60   virtual ~NodeObserver() {}
  61 };
  62
  63 }  // namespace view_manager
  64 }  // namespace mojo
  65
  66 #endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_NODE_OBSERVER_H_