gecko/content/base/src/nsFrameLoader.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
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 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Johnny Stenback <jst@netscape.com> (original author)
 *
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/*
 * Class for managing loading of a subframe (creation of the docshell,
 * handling of loads in it, recursion-checking).
 */

#ifndef nsFrameLoader_h_
#define nsFrameLoader_h_

#include "nsIDocShell.h"
#include "nsStringFwd.h"
#include "nsIFrameLoader.h"
#include "nsSize.h"
#include "nsIURI.h"
#include "nsAutoPtr.h"

class nsIContent;
class nsIURI;
class nsIFrameFrame;

#ifdef MOZ_IPC
namespace mozilla {
  namespace dom {
    class TabParent;
  }
}
#endif

class nsFrameLoader : public nsIFrameLoader
{
protected:
  nsFrameLoader(nsIContent *aOwner) :
    mOwnerContent(aOwner),
    mDepthTooGreat(PR_FALSE),
    mIsTopLevelContent(PR_FALSE),
    mDestroyCalled(PR_FALSE),
    mNeedsAsyncDestroy(PR_FALSE),
    mInSwap(PR_FALSE)
#ifdef MOZ_IPC
    , mRemoteFrame(false)
    , mChildProcess(nsnull)
#endif
  {}

public:
  ~nsFrameLoader() {
    mNeedsAsyncDestroy = PR_TRUE;
    nsFrameLoader::Destroy();
  }

  static nsFrameLoader* Create(nsIContent* aOwner);

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS(nsFrameLoader)
  NS_DECL_NSIFRAMELOADER
  NS_HIDDEN_(nsresult) CheckForRecursiveLoad(nsIURI* aURI);
  nsresult ReallyStartLoading();
  void Finalize();
  nsIDocShell* GetExistingDocShell() { return mDocShell; }

  /**
   * Called from the layout frame associated with this frame loader;
   * this notifies us to hook up with the widget and view.
   */
  bool Show(PRInt32 marginWidth, PRInt32 marginHeight,
            PRInt32 scrollbarPrefX, PRInt32 scrollbarPrefY,
            nsIFrameFrame* frame);

  /**
   * Called from the layout frame associated with this frame loader, when
   * the frame is being torn down; this notifies us that out widget and view
   * are going away and we should unhook from them.
   */
  void Hide();

  // The guts of an nsIFrameLoaderOwner::SwapFrameLoader implementation.  A
  // frame loader owner needs to call this, and pass in the two references to
  // nsRefPtrs for frame loaders that need to be swapped.
  nsresult SwapWithOtherLoader(nsFrameLoader* aOther,
                               nsRefPtr<nsFrameLoader>& aFirstToSwap,
                               nsRefPtr<nsFrameLoader>& aSecondToSwap);
private:

#ifdef MOZ_IPC
  bool ShouldUseRemoteProcess();
#endif

  /**
   * If we are an IPC frame, set mRemoteFrame. Otherwise, create and
   * initialize mDocShell.
   */
  nsresult MaybeCreateDocShell();
  void GetURL(nsString& aURL);

  // Properly retrieves documentSize of any subdocument type.
  NS_HIDDEN_(nsIntSize) GetSubDocumentSize(const nsIFrame *aIFrame);

  // Updates the subdocument position and size. This gets called only
  // when we have our own in-process DocShell.
  NS_HIDDEN_(nsresult) UpdateBaseWindowPositionAndSize(nsIFrame *aIFrame);
  nsresult CheckURILoad(nsIURI* aURI);

#ifdef MOZ_IPC
  // True means new process started; nothing else to do
  PRBool TryNewProcess();
#endif

  nsCOMPtr<nsIDocShell> mDocShell;
  nsCOMPtr<nsIURI> mURIToLoad;
  nsIContent *mOwnerContent; // WEAK
  PRPackedBool mDepthTooGreat : 1;
  PRPackedBool mIsTopLevelContent : 1;
  PRPackedBool mDestroyCalled : 1;
  PRPackedBool mNeedsAsyncDestroy : 1;
  PRPackedBool mInSwap : 1;

#ifdef MOZ_IPC
  bool mRemoteFrame;
  // XXX leaking
  mozilla::dom::TabParent* mChildProcess;
#endif
};

#endif