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      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 #include "config.h"
      6 #include "modules/presentation/NavigatorPresentation.h"
      7 
      8 #include "core/dom/Document.h"
      9 #include "core/frame/LocalFrame.h"
     10 #include "core/frame/Navigator.h"
     11 #include "modules/presentation/Presentation.h"
     12 #include "platform/heap/Handle.h"
     13 
     14 namespace blink {
     15 
     16 NavigatorPresentation::NavigatorPresentation(LocalFrame* frame)
     17     : DOMWindowProperty(frame)
     18 {
     19 }
     20 
     21 NavigatorPresentation::~NavigatorPresentation()
     22 {
     23 }
     24 
     25 // static
     26 const char* NavigatorPresentation::supplementName()
     27 {
     28     return "NavigatorPresentation";
     29 }
     30 
     31 // static
     32 NavigatorPresentation& NavigatorPresentation::from(Navigator& navigator)
     33 {
     34     NavigatorPresentation* supplement = static_cast<NavigatorPresentation*>(WillBeHeapSupplement<Navigator>::from(navigator, supplementName()));
     35     if (!supplement) {
     36         supplement = new NavigatorPresentation(navigator.frame());
     37         provideTo(navigator, supplementName(), adoptPtrWillBeNoop(supplement));
     38     }
     39     return *supplement;
     40 }
     41 
     42 // static
     43 Presentation* NavigatorPresentation::presentation(Navigator& navigator)
     44 {
     45     return NavigatorPresentation::from(navigator).presentation();
     46 }
     47 
     48 Presentation* NavigatorPresentation::presentation()
     49 {
     50     if (!m_presentation) {
     51         if (!frame())
     52             return 0;
     53         m_presentation = Presentation::create(frame()->document());
     54     }
     55     return m_presentation.get();
     56 }
     57 
     58 void NavigatorPresentation::trace(Visitor* visitor)
     59 {
     60     visitor->trace(m_presentation);
     61     WillBeHeapSupplement<Navigator>::trace(visitor);
     62     DOMWindowProperty::trace(visitor);
     63 }
     64 
     65 } // namespace blink
     66