/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 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
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * 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)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * 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"
#include "nsFrameMessageManager.h"

class nsIContent;
class nsIURI;
class nsIFrameFrame;
class nsIView;
class nsIInProcessContentFrameMessageManager;
class AutoResetInShow;

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

#ifdef MOZ_WIDGET_GTK2
typedef struct _GtkWidget GtkWidget;
#endif
#ifdef MOZ_WIDGET_QT
class QX11EmbedContainer;
#endif
#endif

class nsFrameLoader : public nsIFrameLoader
{
  friend class AutoResetInShow;
#ifdef MOZ_IPC
  typedef mozilla::dom::PBrowserParent PBrowserParent;
  typedef mozilla::dom::TabParent TabParent;
#endif

protected:
  nsFrameLoader(nsIContent *aOwner) :
    mOwnerContent(aOwner),
    mDepthTooGreat(PR_FALSE),
    mIsTopLevelContent(PR_FALSE),
    mDestroyCalled(PR_FALSE),
    mNeedsAsyncDestroy(PR_FALSE),
    mInSwap(PR_FALSE),
    mInShow(PR_FALSE),
    mHideCalled(PR_FALSE)
#ifdef MOZ_IPC
    , mDelayRemoteDialogs(PR_FALSE)
    , mRemoteWidgetCreated(PR_FALSE)
    , mRemoteFrame(false)
    , mRemoteBrowser(nsnull)
#if defined(MOZ_WIDGET_GTK2) || defined(MOZ_WIDGET_QT)
    , mRemoteSocket(nsnull)
#endif
#endif
  {}

public:
  ~nsFrameLoader() {
    mNeedsAsyncDestroy = PR_TRUE;
    if (mMessageManager) {
      mMessageManager->Disconnect();
    }
    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; }
  nsPIDOMEventTarget* GetTabChildGlobalAsEventTarget();
  nsresult CreateStaticClone(nsIFrameLoader* aDest);

  /**
   * Called from the layout frame associated with this frame loader;
   * this notifies us to hook up with the widget and view.
   */
  PRBool 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();

  nsresult CloneForStatic(nsIFrameLoader* aOriginal);

  // 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);

  // When IPC is enabled, destroy any associated child process.
  void DestroyChild();

#ifdef MOZ_IPC
  PBrowserParent* GetRemoteBrowser();
#endif
  nsFrameMessageManager* GetFrameMessageManager() { return mMessageManager; }

private:

#ifdef MOZ_IPC
  bool ShouldUseRemoteProcess();
#endif

  /**
   * If we are an IPC frame, set mRemoteFrame. Otherwise, create and
   * initialize mDocShell.
   */
  nsresult MaybeCreateDocShell();
  nsresult EnsureMessageManager();
  NS_HIDDEN_(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);
  void FireErrorEvent();
  nsresult ReallyStartLoadingInternal();

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

  // Do the hookup necessary to actually show a remote frame once the view and
  // widget are available.
  bool ShowRemoteFrame(nsIFrameFrame* frame, nsIView* view);
#endif

  nsCOMPtr<nsIDocShell> mDocShell;
  nsCOMPtr<nsIURI> mURIToLoad;
  nsIContent *mOwnerContent; // WEAK
public:
  // public because a callback needs these.
  nsRefPtr<nsFrameMessageManager> mMessageManager;
  nsCOMPtr<nsIInProcessContentFrameMessageManager> mChildMessageManager;
private:
  PRPackedBool mDepthTooGreat : 1;
  PRPackedBool mIsTopLevelContent : 1;
  PRPackedBool mDestroyCalled : 1;
  PRPackedBool mNeedsAsyncDestroy : 1;
  PRPackedBool mInSwap : 1;
  PRPackedBool mInShow : 1;
  PRPackedBool mHideCalled : 1;

#ifdef MOZ_IPC
  PRPackedBool mDelayRemoteDialogs : 1;
  PRPackedBool mRemoteWidgetCreated : 1;
  bool mRemoteFrame;
  // XXX leaking
  nsCOMPtr<nsIObserver> mChildHost;
  TabParent* mRemoteBrowser;

#ifdef MOZ_WIDGET_GTK2
  GtkWidget* mRemoteSocket;
#elif defined(MOZ_WIDGET_QT)
  QX11EmbedContainer* mRemoteSocket;
#endif
#endif

};

#endif