components/view_manager/public/cpp/scoped_view_ptr.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_VIEW_MANAGER_PUBLIC_CPP_SCOPED_VIEW_PTR_H_
   6 #define COMPONENTS_VIEW_MANAGER_PUBLIC_CPP_SCOPED_VIEW_PTR_H_
   7
   8 #include "components/view_manager/public/cpp/view_observer.h"
   9
  10 namespace mojo {
  11
  12 // Wraps a View, taking overship of the View. Also deals with View being
  13 // destroyed while ScopedViewPtr still exists.
  14 class ScopedViewPtr : public ViewObserver {
  15  public:
  16   explicit ScopedViewPtr(View* view);
  17   ~ScopedViewPtr() override;
  18
  19   // Destroys |view|. If |view| is the root of the ViewManager than the
  20   // ViewManager is destroyed (which in turn destroys |view|).
  21   static void DeleteViewOrViewManager(View* view);
  22
  23   View* view() { return view_; }
  24   const View* view() const { return view_; }
  25
  26  private:
  27   void DetachFromView();
  28
  29   void OnViewDestroying(View* view) override;
  30
  31   View* view_;
  32
  33   DISALLOW_COPY_AND_ASSIGN(ScopedViewPtr);
  34 };
  35
  36 }  // namespace mojo
  37
  38 #endif  // COMPONENTS_VIEW_MANAGER_PUBLIC_CPP_SCOPED_VIEW_PTR_H_