text: /*
   * Copyright (C) 2010, 2011 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include <WebCore/BackForwardClient.h>
  #include <WebCore/PageIdentifier.h>
  #include <wtf/HashSet.h>
  
  namespace WebCore {
  struct BackForwardItemIdentifier;
  }
  
  namespace WebKit {
  
  class WebPage;
  
  class WebBackForwardListProxy : public WebCore::BackForwardClient {
  public: 
      static Ref<WebBackForwardListProxy> create(WebPage& page) { return adoptRef(*new WebBackForwardListProxy(page)); }
  
      static WebCore::HistoryItem* itemForID(const WebCore::BackForwardItemIdentifier&);
      static void removeItem(const WebCore::BackForwardItemIdentifier&);
  
      enum class OverwriteExistingItem {
          Yes,
          No
      };
      void addItemFromUIProcess(const WebCore::BackForwardItemIdentifier&, Ref<WebCore::HistoryItem>&&, WebCore::PageIdentifier, OverwriteExistingItem);
  
      void clear();
  
  private:
      WebBackForwardListProxy(WebPage&);
  
      void addItem(Ref<WebCore::HistoryItem>&&) override;
  
      void goToItem(WebCore::HistoryItem&) override;
          
      RefPtr<WebCore::HistoryItem> itemAtIndex(int) override;
      unsigned backListCount() const override;
      unsigned forwardListCount() const override;
  
      void close() override;
  
      WebPage* m_page;
  };
  
  } // namespace WebKit
  