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nsTypeAheadFind.cpp

/* -*- 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.org 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):
 *   Original Author: Aaron Leventhal (aaronl@netscape.com)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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 ***** */

#include "nsCOMPtr.h"
#include "nsMemory.h"
#include "nsIServiceManager.h"
#include "nsIGenericFactory.h"
#include "nsIWebBrowserChrome.h"
#include "nsCURILoader.h"
#include "nsNetUtil.h"
#include "nsIURL.h"
#include "nsIURI.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIEditorDocShell.h"
#include "nsISimpleEnumerator.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMNSUIEvent.h"
#include "nsIDOMNSEvent.h"
#include "nsIPrefBranch.h"
#include "nsIPrefBranch2.h"
#include "nsIPrefService.h"
#include "nsString.h"
#include "nsCRT.h"

#include "nsIDOMNode.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsFrameTraversal.h"
#include "nsIDOMDocument.h"
#include "nsIDOMXULDocument.h"
#include "nsIImageDocument.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMNSHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsIEventStateManager.h"
#include "nsIViewManager.h"
#include "nsIScrollableView.h"
#include "nsIDocument.h"
#include "nsISelection.h"
#include "nsISelectionPrivate.h"
#include "nsISelectElement.h"
#include "nsILink.h"
#include "nsTextFragment.h"
#include "nsILookAndFeel.h"

#include "nsICaret.h"
#include "nsIDOMKeyEvent.h"
#include "nsIDocShellTreeItem.h"
#include "nsIWebNavigation.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsContentCID.h"
#include "nsLayoutCID.h"
#include "nsWidgetsCID.h"
#include "nsIFormControl.h"
#include "nsINameSpaceManager.h"
#include "nsIWindowWatcher.h"
#include "nsIObserverService.h"

#include "nsIPrivateTextEvent.h"
#include "nsIPrivateCompositionEvent.h"
#include "nsGUIEvent.h"
#include "nsPIDOMEventTarget.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOM3EventTarget.h"
#include "nsIDOMEventGroup.h"
#include "nsPresShellIterator.h"

// Header for this class
#include "nsTypeAheadFind.h"

////////////////////////////////////////////////////////////////////////


NS_INTERFACE_MAP_BEGIN(nsTypeAheadFind)
  NS_INTERFACE_MAP_ENTRY(nsISuiteTypeAheadFind)
  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
  NS_INTERFACE_MAP_ENTRY(nsITimerCallback)
  NS_INTERFACE_MAP_ENTRY(nsIScrollPositionListener)
  NS_INTERFACE_MAP_ENTRY(nsISelectionListener)
  NS_INTERFACE_MAP_ENTRY(nsIObserver)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsISelectionListener)
  NS_INTERFACE_MAP_ENTRY(nsIDOMKeyListener)
  NS_INTERFACE_MAP_ENTRY(nsIDOMTextListener)
  NS_INTERFACE_MAP_ENTRY(nsIDOMCompositionListener)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsIDOMEventListener, nsIDOMKeyListener)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(nsTypeAheadFind)
NS_IMPL_RELEASE(nsTypeAheadFind)

static NS_DEFINE_IID(kRangeCID, NS_RANGE_CID);
static NS_DEFINE_CID(kFrameTraversalCID, NS_FRAMETRAVERSAL_CID);
static NS_DEFINE_CID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);

#define NS_FIND_CONTRACTID "@mozilla.org/embedcomp/rangefind;1"

nsTypeAheadFind* nsTypeAheadFind::sInstance = nsnull;
PRInt32 nsTypeAheadFind::sAccelKey = -1;  // magic value of -1 when unitialized


nsTypeAheadFind::nsTypeAheadFind():
  mIsFindAllowedInWindow(PR_FALSE), mAutoStartPref(PR_FALSE),
  mLinksOnlyPref(PR_FALSE), mStartLinksOnlyPref(PR_FALSE),
  mLinksOnly(PR_FALSE), mIsTypeAheadOn(PR_FALSE), mCaretBrowsingOn(PR_FALSE),
  mLiteralTextSearchOnly(PR_FALSE), mDontTryExactMatch(PR_FALSE),
  mAllTheSameChar(PR_TRUE),
  mLinksOnlyManuallySet(PR_FALSE), mIsFindingText(PR_FALSE),
  mIsMenuBarActive(PR_FALSE), mIsMenuPopupActive(PR_FALSE),
  mIsFirstVisiblePreferred(PR_FALSE), mIsIMETypeAheadActive(PR_FALSE),
  mIsBackspaceProtectOn(PR_FALSE),
  mBadKeysSinceMatch(0), mLastBadChar(0),
  mRepeatingMode(eRepeatingNone), mTimeoutLength(0),
  mSoundInterface(nsnull), mIsSoundInitialized(PR_FALSE)
{
#ifdef DEBUG
  // There should only ever be one instance of us
  static PRInt32 gInstanceCount;
  ++gInstanceCount;
  NS_ASSERTION(gInstanceCount == 1,
    "There should be only 1 instance of nsTypeAheadFind!");
#endif
}


nsTypeAheadFind::~nsTypeAheadFind()
{
  RemoveDocListeners();
  mTimer = nsnull;

  nsCOMPtr<nsIPrefBranch2> prefInternal(do_GetService(NS_PREFSERVICE_CONTRACTID));
  if (prefInternal) {
    prefInternal->RemoveObserver("accessibility.typeaheadfind", this);
    prefInternal->RemoveObserver("accessibility.browsewithcaret", this);
  }
}

nsresult
nsTypeAheadFind::Init()
{
  nsresult rv = NS_NewISupportsArray(getter_AddRefs(mManualFindWindows));
  NS_ENSURE_SUCCESS(rv, rv);


  nsCOMPtr<nsIPrefBranch2> prefInternal(do_GetService(NS_PREFSERVICE_CONTRACTID));
  mSearchRange = do_CreateInstance(kRangeCID);
  mStartPointRange = do_CreateInstance(kRangeCID);
  mEndPointRange = do_CreateInstance(kRangeCID);
  mFind = do_CreateInstance(NS_FIND_CONTRACTID);
  if (!prefInternal || !mSearchRange || !mStartPointRange ||
      !mEndPointRange || !mFind) {
    return NS_ERROR_FAILURE;
  }

  // ----------- Listen to prefs ------------------
  rv = prefInternal->AddObserver("accessibility.typeaheadfind", this, PR_FALSE);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = prefInternal->AddObserver("accessibility.browsewithcaret", this, PR_FALSE);
  NS_ENSURE_SUCCESS(rv, rv);


  // ----------- Get accel key --------------------
  rv = prefInternal->GetIntPref("ui.key.accelKey", &sAccelKey);
  NS_ENSURE_SUCCESS(rv, rv);

  // ----------- Get initial preferences ----------
  PrefsReset();

  // ----------- Set search options ---------------
  mFind->SetCaseSensitive(PR_FALSE);
  mFind->SetWordBreaker(nsnull);

  return rv;
}

nsTypeAheadFind *
nsTypeAheadFind::GetInstance()
{
  if (!sInstance) {
    sInstance = new nsTypeAheadFind();
    if (!sInstance)
      return nsnull;

    NS_ADDREF(sInstance);  // addref for sInstance global

    if (NS_FAILED(sInstance->Init())) {
      NS_RELEASE(sInstance);

      return nsnull;
    }
  }

  NS_ADDREF(sInstance);   // addref for the getter

  return sInstance;
}


void
nsTypeAheadFind::ReleaseInstance()
{
  NS_IF_RELEASE(sInstance);
}


void 
nsTypeAheadFind::Shutdown()
{
  RemoveDocListeners();

  // Application shutdown 
  mTimer = nsnull;

  nsCOMPtr<nsIWindowWatcher> windowWatcher =
    do_GetService(NS_WINDOWWATCHER_CONTRACTID);
  if (windowWatcher) {
    windowWatcher->UnregisterNotification(this);
  }

  // Clear strong refs.  It's important to release these so that we don't hold
  // on to objects that depends on other modules.
  // E.g. gfxFonts in the nsThebesGfxModule, see bug 398084 and bug 414559.
  mSoundInterface = nsnull;
  mStartFindRange = nsnull;
  mSearchRange = nsnull;
  mStartPointRange = nsnull;
  mEndPointRange = nsnull;
  mFind = nsnull;
  mFindService = nsnull;
  mStringBundle = nsnull;
  mTimer = nsnull;
  mFocusController = nsnull;
  mFocusedDocSelection = nsnull;
  mFocusedDocSelCon = nsnull;
  mFocusedWindow = nsnull;
  mFocusedWeakShell = nsnull;
  mManualFindWindows->Clear();
}


// ------- Pref Callbacks (2) ---------------

nsresult
nsTypeAheadFind::PrefsReset()
{
  nsCOMPtr<nsIPrefBranch> prefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID));
  NS_ENSURE_TRUE(prefBranch, NS_ERROR_FAILURE);

  PRBool wasTypeAheadOn = mIsTypeAheadOn;

  prefBranch->GetBoolPref("accessibility.typeaheadfind", &mIsTypeAheadOn);

  if (mIsTypeAheadOn != wasTypeAheadOn) {
    if (!mIsTypeAheadOn) {
      CancelFind();
    }
    else if (!mStringBundle) {
      // Get ready to watch windows
      nsresult rv;
      nsCOMPtr<nsIWindowWatcher> windowWatcher =
        do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv);
      NS_ENSURE_SUCCESS(rv, rv);

      windowWatcher->RegisterNotification(this);

      // Initialize string bundle
      nsCOMPtr<nsIStringBundleService> stringBundleService =
        do_GetService(NS_STRINGBUNDLE_CONTRACTID);

      if (stringBundleService)
        stringBundleService->CreateBundle(TYPEAHEADFIND_BUNDLE_URL,
                                          getter_AddRefs(mStringBundle));

      // Observe find again commands. We'll handle them if we were the last find
      nsCOMPtr<nsIObserverService> observerService = 
        do_GetService("@mozilla.org/observer-service;1", &rv);
      NS_ENSURE_SUCCESS(rv, rv);
      observerService->AddObserver(this, "nsWebBrowserFind_FindAgain", 
                                   PR_TRUE);
      observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, 
                                   PR_TRUE);
    }
  }

  PRBool oldAutoStartPref = mAutoStartPref;
  prefBranch->GetBoolPref("accessibility.typeaheadfind.autostart",
                           &mAutoStartPref);
  if (mAutoStartPref != oldAutoStartPref) {
    ResetGlobalAutoStart(mAutoStartPref);
  }
 
  prefBranch->GetBoolPref("accessibility.typeaheadfind.linksonly",
                          &mLinksOnlyPref);

  prefBranch->GetBoolPref("accessibility.typeaheadfind.startlinksonly",
                          &mStartLinksOnlyPref);

  PRBool isSoundEnabled = PR_TRUE;
  prefBranch->GetBoolPref("accessibility.typeaheadfind.enablesound",
                           &isSoundEnabled);
  nsXPIDLCString soundStr;
  if (isSoundEnabled) {
    prefBranch->GetCharPref("accessibility.typeaheadfind.soundURL",
                             getter_Copies(soundStr));
  }
  mNotFoundSoundURL = soundStr;

  PRBool isTimeoutEnabled = PR_FALSE;
  prefBranch->GetBoolPref("accessibility.typeaheadfind.enabletimeout",
                          &isTimeoutEnabled);
  PRInt32 timeoutLength = 0;
  if (isTimeoutEnabled) {
    prefBranch->GetIntPref("accessibility.typeaheadfind.timeout",
                           &timeoutLength);
  }
  mTimeoutLength = timeoutLength;


  prefBranch->GetBoolPref("accessibility.browsewithcaret",
                          &mCaretBrowsingOn);

  return NS_OK;
}


// ------- nsITimer Methods (1) ---------------

NS_IMETHODIMP
nsTypeAheadFind::Notify(nsITimer *timer)
{
  CancelFind();
  return NS_OK;
}

// ----------- nsIObserver Methods (1) -------------------

NS_IMETHODIMP
nsTypeAheadFind::Observe(nsISupports *aSubject, const char *aTopic,
                         const PRUnichar *aData)
{
  PRBool isOpening;
  if (!nsCRT::strcmp(aTopic,"domwindowopened")) {
    isOpening = PR_TRUE;
  }
  else if (!nsCRT::strcmp(aTopic,"domwindowclosed")) {
    isOpening = PR_FALSE;
  }
  else if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
    Shutdown();
    return NS_OK;
  }
  else if (!nsCRT::strcmp(aTopic,"nsWebBrowserFind_FindAgain")) {
    // A find next command wants to be executed.
    // We might want to handle it. If we do, return true in didExecute.
    nsCOMPtr<nsISupportsInterfacePointer> callerWindowSupports(do_QueryInterface(aSubject));
    return FindNext(NS_LITERAL_STRING("up").Equals(aData), callerWindowSupports);
  }
  else if (!nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
    return PrefsReset();
  }
  else {
    return NS_OK;
  }

  // -- Attach/Remove window listeners --
  nsCOMPtr<nsIDOMWindow> topLevelWindow(do_QueryInterface(aSubject));
  NS_ENSURE_TRUE(topLevelWindow, NS_OK);
  nsCOMPtr<nsPIDOMWindow> privateWindow = do_QueryInterface(aSubject);
  nsIFocusController *focusController =
    privateWindow->GetRootFocusController();
  NS_ENSURE_TRUE(focusController, NS_ERROR_FAILURE);

  if (isOpening) {
    if (mAutoStartPref) {
      AttachWindowListeners(topLevelWindow);
    }

    // Attach nsTypeAheadController to window
    // so it can handle / and ' shortcuts to start text and link search
    if (privateWindow) {
      nsCOMPtr<nsIControllers> controllers;
      privateWindow->GetControllers(getter_AddRefs(controllers));
      NS_ENSURE_TRUE(controllers, NS_ERROR_FAILURE);

      nsCOMPtr<nsIController> controller = 
        new nsTypeAheadController(focusController);
      NS_ENSURE_TRUE(controller, NS_ERROR_FAILURE);

      controllers->AppendController(controller);
    }
 
    return NS_OK;
  }

  nsCOMPtr<nsIDOMWindowInternal> activeWindowInternal;
  focusController->GetFocusedWindow(getter_AddRefs(activeWindowInternal));
  nsCOMPtr<nsIDOMWindow> activeWindow = do_QueryInterface(activeWindowInternal);

  RemoveWindowListeners(topLevelWindow);

  // -- Prevent leaks ---
  // When a window closes, we have to remove it and all of its subwindows
  // from mManualFindWindows so that we don't leak.
  // Eek, lots of work for such a simple thing.
  nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(aSubject));
  NS_ENSURE_TRUE(ifreq, NS_OK);

  nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(ifreq));
  nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(webNav));
  NS_ENSURE_TRUE(docShell, NS_OK);

  nsCOMPtr<nsISimpleEnumerator> docShellEnumerator;
  docShell->GetDocShellEnumerator(nsIDocShellTreeItem::typeAll,
                                  nsIDocShell::ENUMERATE_FORWARDS,
                                  getter_AddRefs(docShellEnumerator));

  // Iterate through shells to get windows
  PRBool hasMoreDocShells;
  while (NS_SUCCEEDED(docShellEnumerator->HasMoreElements(&hasMoreDocShells))
         && hasMoreDocShells) {
    nsCOMPtr<nsISupports> container;
    docShellEnumerator->GetNext(getter_AddRefs(container));
    nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(container));

    if (ifreq) {
      nsCOMPtr<nsIDOMWindow> domWin(do_GetInterface(ifreq));
      nsCOMPtr<nsISupports> windowSupports(do_QueryInterface(domWin));

      if (windowSupports) {
        PRInt32 index = mManualFindWindows->IndexOf(windowSupports);

        if (index >= 0) {
          mManualFindWindows->RemoveElementAt(index);
        }
      }

      // Don't hold references to things that will keep objects alive
      // longer than they would otherwise be.
      if (domWin == mFocusedWindow) {
        RemoveDocListeners();
        CancelFind();
      }
      if (domWin == activeWindow) {
        // If popup was still open as its parent window closes, don't stay in
        // menu active state which prevents us from operating
        mIsMenuBarActive = mIsMenuPopupActive = PR_FALSE;
      }
    }
  }

  return NS_OK;
}


nsresult
nsTypeAheadFind::UseInWindow(nsIDOMWindow *aDOMWin)
{
  NS_ENSURE_ARG_POINTER(aDOMWin);

  // Set member variables and listeners up for new window and doc

  mFindNextBuffer.Truncate();
  CancelFind();

  GetStartWindow(aDOMWin, getter_AddRefs(mFocusedWindow));

  nsCOMPtr<nsIDOMDocument> domDoc;
  aDOMWin->GetDocument(getter_AddRefs(domDoc));
  nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));

  if (!doc) {
    return NS_OK;
  }

  nsIPresShell *presShell = doc->GetPrimaryShell();

  if (!presShell) {
    return NS_OK;
  }

  nsCOMPtr<nsIPresShell> oldPresShell(GetPresShell());

  if (!oldPresShell || oldPresShell != presShell) {
    CancelFind();
  } else if (presShell == oldPresShell) {
    // Same window, no need to reattach listeners

    return NS_OK;
  }

  RemoveDocListeners();

  mIsFindAllowedInWindow = PR_TRUE;
  mFocusedWeakShell = do_GetWeakReference(presShell);

  // Add scroll position and selection listeners, so we can cancel
  // current find when user navigates
  GetSelection(presShell, getter_AddRefs(mFocusedDocSelCon),
               getter_AddRefs(mFocusedDocSelection)); // cache for reuse
  AttachDocListeners(presShell);

  return NS_OK;
}


// ------- nsIDOMEventListener Methods (1) ---------------

NS_IMETHODIMP
nsTypeAheadFind::HandleEvent(nsIDOMEvent* aEvent)
{
  nsAutoString eventType;
  aEvent->GetType(eventType);

  if (eventType.EqualsLiteral("DOMMenuBarActive")) {
    mIsMenuBarActive = PR_TRUE;
  }
  else if (eventType.EqualsLiteral("DOMMenuBarInactive")) {
    mIsMenuBarActive = PR_FALSE;
  }
  else if (eventType.EqualsLiteral("popupshown")) {
    mIsMenuPopupActive = PR_TRUE;
  }
  else if (eventType.EqualsLiteral("popuphidden")) {
    mIsMenuPopupActive = PR_FALSE;
  }
  else if (eventType.EqualsLiteral("unload")) {
    // When document is unloaded, check to see if it's the 
    // current typeahead doc. If it is, cancel find
    // and reset member variables so we don't leak
    nsCOMPtr<nsIDOMNSEvent> event(do_QueryInterface(aEvent));
    NS_ENSURE_TRUE(event, NS_ERROR_FAILURE);

    nsCOMPtr<nsIDOMEventTarget> eventTarget;
    event->GetOriginalTarget(getter_AddRefs(eventTarget));
    nsCOMPtr<nsIDocument> doc(do_QueryInterface(eventTarget));
    nsCOMPtr<nsIPresShell> focusedShell(GetPresShell());
    if (!focusedShell || !doc) {
      return NS_ERROR_FAILURE;
    }

    PRBool cancelFind = PR_FALSE;

    nsPresShellIterator iter(doc);
    nsCOMPtr<nsIPresShell> shellToBeDestroyed;
    while ((shellToBeDestroyed = iter.GetNextShell())) {
      if (shellToBeDestroyed == focusedShell) {
        cancelFind = PR_TRUE;
        break;
      }
    }

    if (cancelFind) {
      RemoveDocListeners();
      mSearchRange = do_CreateInstance(kRangeCID);
      mStartPointRange = do_CreateInstance(kRangeCID);
      mEndPointRange = do_CreateInstance(kRangeCID);
      mFocusedWindow = nsnull;
      CancelFind();
    }
  }

  return NS_OK;
}


// ------- nsIDOMKeyListener Methods (3) ---------------

NS_IMETHODIMP
nsTypeAheadFind::KeyDown(nsIDOMEvent* aEvent)
{
  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::KeyUp(nsIDOMEvent* aEvent)
{
  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::KeyPress(nsIDOMEvent* aEvent)
{
  if (!mIsTypeAheadOn || mIsMenuBarActive || mIsMenuPopupActive) {
    return NS_OK;
  }

  if (!mIsSoundInitialized && !mNotFoundSoundURL.IsEmpty()) {
    // This makes sure system sound library is loaded so that
    // there's no lag before the first sound is played
    // by waiting for the first keystroke, we still get the startup time benefits.
    mIsSoundInitialized = PR_TRUE;
    mSoundInterface = do_CreateInstance("@mozilla.org/sound;1");
    if (mSoundInterface && !mNotFoundSoundURL.EqualsLiteral("beep")) {
      mSoundInterface->Init();
    }
  }

#ifdef XP_WIN
  // After each keystroke, ensure sound object is destroyed, to free up memory 
  // allocated for error sound, otherwise Windows' nsISound impl 
  // holds onto the last played sound, using up memory.
  mSoundInterface = nsnull;
#endif
  nsCOMPtr<nsIContent> targetContent;
  nsCOMPtr<nsIPresShell> targetPresShell;
  GetTargetIfTypeAheadOkay(aEvent, getter_AddRefs(targetContent), 
    getter_AddRefs(targetPresShell));
  if (!targetContent || !targetPresShell)
    return NS_OK;

  PRUint32 keyCode(0), charCode;
  PRBool isShift(PR_FALSE), isCtrl(PR_FALSE), isAlt(PR_FALSE), isMeta(PR_FALSE);
  nsCOMPtr<nsIDOMKeyEvent> keyEvent(do_QueryInterface(aEvent));

  // ---------- Analyze keystroke, exit early if possible --------------

  if (!keyEvent ||
      NS_FAILED(keyEvent->GetKeyCode(&keyCode)) ||
      NS_FAILED(keyEvent->GetCharCode(&charCode)) ||
      NS_FAILED(keyEvent->GetShiftKey(&isShift)) ||
      NS_FAILED(keyEvent->GetCtrlKey(&isCtrl)) ||
      NS_FAILED(keyEvent->GetAltKey(&isAlt)) ||
      NS_FAILED(keyEvent->GetMetaKey(&isMeta))) {
    return NS_ERROR_FAILURE;
  }

  // ---------- Set Backspace Protection --------------------------
  // mIsBackspaceProtectOn should be PR_TRUE only if the last key 
  // was a backspace and this key is also a backspace. It keeps us 
  // from accidentally hitting backspace too many times in a row, going 
  // back in history when we really just wanted to clear the find string.
  if (keyCode != nsIDOMKeyEvent::DOM_VK_BACK_SPACE) {
    mIsBackspaceProtectOn = PR_FALSE;
  }

  // ---------- Check the keystroke --------------------------------
  if ((isAlt && !isShift) || isCtrl || isMeta) {
    // Ignore most modified keys, but alt+shift may be used for
    // entering foreign chars.

    return NS_OK;
  }

  // ------------- Escape pressed ---------------------
  if (keyCode == nsIDOMKeyEvent::DOM_VK_ESCAPE) {
    // Escape accomplishes 2 things:
    // 1. it is a way for the user to deselect with the keyboard
    // 2. it is a way for the user to cancel incremental find with
    //    visual feedback
    if (mLinksOnlyManuallySet || !mTypeAheadBuffer.IsEmpty()) {
      // If Escape is normally used for a command, don't do it
      aEvent->PreventDefault();
      CancelFind();
    }
    if (mFocusedDocSelection) {
      SetSelectionLook(targetPresShell, PR_FALSE, PR_FALSE);
      mFocusedDocSelection->CollapseToStart();
    }

    return NS_OK;
  }

  // ---------- PreventDefault check ---------------
  // If a web page wants to use printable character keys,
  // they have to use evt.preventDefault() after they get the key
  nsCOMPtr<nsIDOMNSUIEvent> uiEvent(do_QueryInterface(aEvent));
  PRBool preventDefault;
  uiEvent->GetPreventDefault(&preventDefault);
  if (preventDefault) {
    return NS_OK;
  }

  // ----------- Back space -------------------------
  if (keyCode == nsIDOMKeyEvent::DOM_VK_BACK_SPACE) {
    // The order of seeing keystrokes is:
    // 1) Chrome, 2) Typeahead, 3) [platform]HTMLBindings.xml
    // If chrome handles backspace, it needs to do this work
    // Otherwise, we handle backspace here.

    // Beware! This may flush notifications via synchronous
    // ScrollSelectionIntoView.
    PRBool backspaceUsed;
    BackOneChar(&backspaceUsed);
    if (backspaceUsed) {
      aEvent->PreventDefault(); // Prevent normal processing of this keystroke
    }

    return NS_OK;
  }
  
  // ----------- Other non-printable keys -----------
  // We ignore space only if it's the first character
  // Function keys, etc. exit here
  if (keyCode || charCode < ' ' || 
      (charCode == ' ' && mTypeAheadBuffer.IsEmpty())) {
    return NS_OK;
  }

  // Ignore first / or ' -- they are used to set links/text only
  // Needs to come to us through htmlBindings.xml's keybinding
  // then via nsTypeAheadController::DoCommand()
  if (!mLinksOnlyManuallySet && (charCode == '\'' || charCode == '/') && 
      mTypeAheadBuffer.IsEmpty()) {
    return NS_OK;
  }

  // We're using this key, no one else should
  aEvent->PreventDefault();

  // Beware! This may flush notifications via synchronous
  // ScrollSelectionIntoView.
  return HandleChar(charCode);
}


NS_IMETHODIMP
nsTypeAheadFind::BackOneChar(PRBool *aIsBackspaceUsed)
{
  if (!mFocusedDocSelection) {
    *aIsBackspaceUsed = PR_FALSE;
    return NS_OK;
  }

  // In normal type ahead find, remove a printable char from 
  // mTypeAheadBuffer, then search for buffer contents
  // Or, in repeated char find, go backwards

  *aIsBackspaceUsed = PR_TRUE;

  // ---------- No chars in string ------------
  if (mTypeAheadBuffer.IsEmpty() || !mStartFindRange) {
    if (!mFindNextBuffer.IsEmpty() &&
        (mRepeatingMode == eRepeatingChar || 
         mRepeatingMode == eRepeatingCharReverse)) {
      // Backspace to find previous repeated char
      mTypeAheadBuffer = mFindNextBuffer;
      mFocusedDocSelection->GetRangeAt(0, getter_AddRefs(mStartFindRange));
    }
    else {
      // No find string to backspace in!
      if (mIsBackspaceProtectOn) {
        // This flag should be on only if the last key was a backspace.
        // It keeps us from accidentally hitting backspace too many times and
        // going back in history when we really just wanted to clear 
        // the find string.
        nsCOMPtr<nsISound> soundInterface =
          do_CreateInstance("@mozilla.org/sound;1");
        if (soundInterface) {
          soundInterface->Beep(); // beep to warn
        }
        mIsBackspaceProtectOn = PR_FALSE;
      }
      else {
        *aIsBackspaceUsed = PR_FALSE;
      }

      return NS_OK;
    }
  }

  // ---------- Only 1 char in string ------------
  if (mTypeAheadBuffer.Length() == 1 && 
      mRepeatingMode != eRepeatingCharReverse) {
    if (mStartFindRange) {
      mIsFindingText = PR_TRUE; // Prevent selection listener side effects
      mFocusedDocSelection->RemoveAllRanges();
      mFocusedDocSelection->AddRange(mStartFindRange);
    }

    mFocusedDocSelection->CollapseToStart();
    mIsFindingText = PR_FALSE;      
    CancelFind();
    mIsBackspaceProtectOn = PR_TRUE;

    return NS_OK;
  }

  // ---------- Multiple chars in string ----------
  PRBool findBackwards = PR_FALSE;
  if (mRepeatingMode == eRepeatingChar ||
           mRepeatingMode == eRepeatingCharReverse) {
    // Backspace in repeating char mode is like 
    mRepeatingMode = eRepeatingCharReverse;
    findBackwards = PR_TRUE;
  }
  else if (!mLastBadChar) {
    mTypeAheadBuffer.Truncate(mTypeAheadBuffer.Length() - 1);
  }

  mLastBadChar = 0;

  if (mBadKeysSinceMatch > 1) {
    --mBadKeysSinceMatch;
    DisplayStatus(PR_FALSE, nsnull, PR_FALSE); // Display failure status
    SaveFind();
    return NS_OK;
  }

  mBadKeysSinceMatch = 0;
  mDontTryExactMatch = PR_FALSE;

  // ---------- Get new find start ------------------
  nsIPresShell *presShell = nsnull;
  if (!findBackwards) {
    // For backspace, start from where first char was found
    // unless in backspacing after repeating char mode
    nsCOMPtr<nsIDOMNode> startNode;
    mStartFindRange->GetStartContainer(getter_AddRefs(startNode));
    if (startNode) {
      nsCOMPtr<nsIDOMDocument> domDoc;
      startNode->GetOwnerDocument(getter_AddRefs(domDoc));
      nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
      if (doc) {
        presShell = doc->GetPrimaryShell();
      }
    }
    if (!presShell) {
      *aIsBackspaceUsed = PR_FALSE;
      return NS_ERROR_FAILURE;
    }
    // Set the selection to the where the first character was found
    // so that find starts from there
    mIsFindingText = PR_TRUE; // so selection won't call CancelFind()
    GetSelection(presShell, getter_AddRefs(mFocusedDocSelCon), 
      getter_AddRefs(mFocusedDocSelection));
    nsCOMPtr<nsIDOMRange> startFindRange = do_CreateInstance(kRangeCID);
    mStartFindRange->CloneRange(getter_AddRefs(startFindRange));
    mFocusedDocSelection->RemoveAllRanges();
    mFocusedDocSelection->AddRange(startFindRange);
    mStartFindRange = startFindRange;
  }

  // ----------- Perform the find ------------------
  mIsFindingText = PR_TRUE; // so selection won't call CancelFind()
  // Beware! This may flush notifications via synchronous
  // ScrollSelectionIntoView.
  if (NS_FAILED(FindItNow(presShell, findBackwards, mLinksOnly, PR_FALSE))) {
    DisplayStatus(PR_FALSE, nsnull, PR_FALSE); // Display failure status
  }
  mIsFindingText = PR_FALSE;

  SaveFind();

  return NS_OK;   // Backspace handled
}


nsresult
nsTypeAheadFind::HandleChar(PRUnichar aChar)
{
  // Add a printable char to mTypeAheadBuffer, then search for buffer contents

  // ------------ Million keys protection -------------
  if (mBadKeysSinceMatch >= kMaxBadCharsBeforeCancel) {
    // If they're just quickly mashing keys onto the keyboard, stop searching
    // until typeahead find is canceled via timeout or another normal means
    StartTimeout();  // Timeout from last bad key (this one)
    DisplayStatus(PR_FALSE, nsnull, PR_TRUE); // Status message to say find stopped
    return NS_ERROR_FAILURE;
  }

  aChar = ToLowerCase(aChar);
  PRInt32 bufferLength = mTypeAheadBuffer.Length();

  mIsFirstVisiblePreferred = PR_FALSE;

  // --------- No new chars after find again ----------
  if (mRepeatingMode == eRepeatingForward ||
      mRepeatingMode == eRepeatingReverse) {
    // Once Accel+[shift]+G or [shift]+F3 has been used once,
    // new typing will start a new find
    CancelFind();
    bufferLength = 0;
    mRepeatingMode = eRepeatingNone;
  }
  // --------- New char in repeated char mode ---------
  else if ((mRepeatingMode == eRepeatingChar ||
           mRepeatingMode == eRepeatingCharReverse) && 
           bufferLength > 1 && aChar != mTypeAheadBuffer.First()) {
    // If they repeat the same character and then change, such as aaaab
    // start over with new char as a repeated char find
    mTypeAheadBuffer = aChar;
  }
  // ------- Set repeating mode ---------
  else if (bufferLength > 0) {
    if (mTypeAheadBuffer.First() != aChar) {
      mRepeatingMode = eRepeatingNone;
      mAllTheSameChar = PR_FALSE;
    }
  }

  mTypeAheadBuffer += aChar;    // Add the char!

  // --------- Initialize find if 1st char ----------
  if (bufferLength == 0) {
    if (!mLinksOnlyManuallySet) {
      // Reset links only to default, if not manually set
      // by the user via ' or / keypress at beginning
      mLinksOnly = mLinksOnlyPref;
    }

    mRepeatingMode = eRepeatingNone;

    // If you can see the selection (not collapsed or thru caret browsing),
    // or if already focused on a page element, start there.
    // Otherwise we're going to start at the first visible element
    NS_ENSURE_TRUE(mFocusedDocSelection, NS_ERROR_FAILURE);
    PRBool isSelectionCollapsed;
    mFocusedDocSelection->GetIsCollapsed(&isSelectionCollapsed);

    // If true, we will scan from top left of visible area
    // If false, we will scan from start of selection
    mIsFirstVisiblePreferred = !mCaretBrowsingOn && isSelectionCollapsed;
    if (mIsFirstVisiblePreferred) {
      // Get focused content from esm. If it's null, the document is focused.
      // If not, make sure the selection is in sync with the focus, so we can 
      // start our search from there.
      nsCOMPtr<nsIContent> focusedContent;
      nsCOMPtr<nsIPresShell> presShell(GetPresShell());
      NS_ENSURE_TRUE(presShell, NS_OK);
      nsPresContext *presContext = presShell->GetPresContext();
      NS_ENSURE_TRUE(presContext, NS_OK);

      nsIEventStateManager *esm = presContext->EventStateManager();
      esm->GetFocusedContent(getter_AddRefs(focusedContent));
      if (focusedContent) {
        mIsFindingText = PR_TRUE; // prevent selection listener from calling CancelFind()
        esm->MoveCaretToFocus();
        mIsFindingText = PR_FALSE;
        mIsFirstVisiblePreferred = PR_FALSE;
      }
      else {
        nsCOMPtr<nsISupports> container = presContext->GetContainer();
        nsCOMPtr<nsIDocShellTreeItem> docShellTreeItem = 
          do_QueryInterface(container);
        nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
        docShellTreeItem->GetSameTypeParent(getter_AddRefs(parentTreeItem));
        if (parentTreeItem) {
          mIsFirstVisiblePreferred = PR_FALSE; // focused on a frame or iframe
        }
      }
    }
  }

  // ----------- Find the text! ---------------------
  mIsFindingText = PR_TRUE; // prevent selection listener from calling CancelFind()

  nsresult rv = NS_ERROR_FAILURE;

  if (mBadKeysSinceMatch <= 1) {   // Don't even try if the last key was already bad
    if (!mDontTryExactMatch) {
      // Regular find, not repeated char find

      // Prefer to find exact match
      // Beware! This may flush notifications via synchronous
      // ScrollSelectionIntoView.
      rv = FindItNow(nsnull, PR_FALSE, mLinksOnly, mIsFirstVisiblePreferred);
    }

#ifndef NO_LINK_CYCLE_ON_SAME_CHAR
    if (NS_FAILED(rv) && !mLiteralTextSearchOnly && mAllTheSameChar && 
        mTypeAheadBuffer.Length() > 1) {
      mRepeatingMode = eRepeatingChar;
      mDontTryExactMatch = PR_TRUE;  // Repeated character find mode
      // Beware! This may flush notifications via synchronous
      // ScrollSelectionIntoView.
      rv = FindItNow(nsnull, PR_TRUE, PR_TRUE, mIsFirstVisiblePreferred);
    }
#endif
  }

  // ---------Handle success or failure ---------------
  mIsFindingText = PR_FALSE;
  if (NS_SUCCEEDED(rv)) {
    mLastBadChar = 0;
    if (mTypeAheadBuffer.Length() == 1) {
      // If first letter, store where the first find succeeded
      // (mStartFindRange)

      mStartFindRange = nsnull;
      nsCOMPtr<nsIDOMRange> startFindRange;
      mFocusedDocSelection->GetRangeAt(0, getter_AddRefs(startFindRange));

      if (startFindRange) {
        startFindRange->CloneRange(getter_AddRefs(mStartFindRange));
      }
    }
  }
  else {
    if (aChar == '/' || aChar == '\'') {
      // Didn't find / or ' -- use that key to start a new text or link find
      return StartNewFind(mFocusedWindow, aChar == '\'');
    }
    PRUint32 length = mTypeAheadBuffer.Length();
    if (mLastBadChar && length >= 1) {
      // We have to do this to put the exact typed string in the status 
      // Otherwise, it will be missing mLastBadChar, which had been removed
      // so that the user could avoid pressing backspace
      nsAutoString lastTwoCharsTyped(mLastBadChar);
      lastTwoCharsTyped += mTypeAheadBuffer.CharAt(length - 1);
      mTypeAheadBuffer.Truncate(length - 1);
      mTypeAheadBuffer += lastTwoCharsTyped;
      ++length;
    }
    DisplayStatus(PR_FALSE, nsnull, PR_FALSE); // Display failure status
    mRepeatingMode = eRepeatingNone;

    ++mBadKeysSinceMatch;

    // Error sound (don't fire when backspace is pressed, they're 
    // trying to correct the mistake!)
    PlayNotFoundSound();

    // Remove bad character from buffer, so we can continue typing from
    // last matched character
    if (length >= 1) {
      mLastBadChar = mTypeAheadBuffer.CharAt(length - 1);
      mTypeAheadBuffer.Truncate(length - 1);
    }
  }

  SaveFind();

  return NS_OK;
}


void
nsTypeAheadFind::SaveFind()
{
  // Store find string for find-next
  mFindNextBuffer = mTypeAheadBuffer;
  if (mLastBadChar) {
    mFindNextBuffer.Append(mLastBadChar);
  }

  nsCOMPtr<nsIWebBrowserFind> webBrowserFind;
  GetWebBrowserFind(mFocusedWindow, getter_AddRefs(webBrowserFind));
  if (webBrowserFind) {
    webBrowserFind->SetSearchString(PromiseFlatString(mTypeAheadBuffer).get());
  }

  if (!mFindService) {
    mFindService = do_GetService("@mozilla.org/find/find_service;1");
  }
  if (mFindService) {
    mFindService->SetSearchString(mFindNextBuffer);
  }

  // --- If accessibility.typeaheadfind.timeout is set,
  //     cancel find after specified # milliseconds ---
  StartTimeout();
}


void
nsTypeAheadFind::PlayNotFoundSound()
{
  if (mNotFoundSoundURL.IsEmpty())    // no sound
    return;
  if (!mSoundInterface) {
    mSoundInterface = do_CreateInstance("@mozilla.org/sound;1");
  }
  if (mSoundInterface) {
    mIsSoundInitialized = PR_TRUE;

    if (mNotFoundSoundURL.Equals("beep")) {
      mSoundInterface->Beep();
      return;
    }

    nsCOMPtr<nsIURI> soundURI;
    if (mNotFoundSoundURL.Equals("default"))
      NS_NewURI(getter_AddRefs(soundURI),
                NS_LITERAL_CSTRING(TYPEAHEADFIND_NOTFOUND_WAV_URL));
    else
      NS_NewURI(getter_AddRefs(soundURI), mNotFoundSoundURL);
    nsCOMPtr<nsIURL> soundURL(do_QueryInterface(soundURI));
    if (soundURL) {
      mSoundInterface->Play(soundURL);
    }
  }
}


NS_IMETHODIMP
nsTypeAheadFind::HandleText(nsIDOMEvent* aTextEvent)
{
  // This is called multiple times in the middle of an 
  // IME composition

  if (!mIsIMETypeAheadActive) {
    return NS_OK;
  }

  // ------- Check if Type Ahead can occur here -------------
  // (and if it can, get the target content and document)
  nsCOMPtr<nsIContent> targetContent;
  nsCOMPtr<nsIPresShell> targetPresShell;
  GetTargetIfTypeAheadOkay(aTextEvent, getter_AddRefs(targetContent), 
    getter_AddRefs(targetPresShell));
  if (!targetContent || !targetPresShell) {
    mIsIMETypeAheadActive = PR_FALSE;
    return NS_OK;
  }

  nsCOMPtr<nsIPrivateTextEvent> textEvent(do_QueryInterface(aTextEvent));
  if (!textEvent)
    return NS_OK;

  textEvent->GetText(mIMEString);

  // show the candidate char/word in the status bar
  DisplayStatus(PR_FALSE, nsnull, PR_FALSE, mIMEString.get());

  // --------- Position the IME window --------------
  // XXX - what do we do with this, is it even necessary?
  //       should we position it in a consistent place?
  nsTextEventReply *textEventReply;
  textEvent->GetEventReply(&textEventReply);

  nsCOMPtr<nsICaret> caret;
  targetPresShell->GetCaret(getter_AddRefs(caret));
  NS_ENSURE_TRUE(caret, NS_ERROR_FAILURE);

  // Reset caret coordinates, so that IM window can move with us
  caret->GetCaretCoordinates(nsICaret::eIMECoordinates, mFocusedDocSelection,
    &(textEventReply->mCursorPosition), &(textEventReply->mCursorIsCollapsed), nsnull);

  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::HandleStartComposition(nsIDOMEvent* aCompositionEvent)
{
  // This is called once at the start of an IME composition

  mIsIMETypeAheadActive = PR_TRUE;

  if (!mIsTypeAheadOn || mIsMenuBarActive || mIsMenuPopupActive) {
    mIsIMETypeAheadActive = PR_FALSE;
    return NS_OK;
  }

  // Pause the cancellation timer until IME is finished
  // HandleChar() will start it again
  if (mTimer) {
    mTimer->Cancel();
  }

  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::HandleEndComposition(nsIDOMEvent* aCompositionEvent)
{
  // This is called once at the end of an IME composition

  if (!mIsIMETypeAheadActive) {
    return PR_FALSE;
  }

  // -------- Find the composed chars one at a time ---------
  nsReadingIterator<PRUnichar> iter;
  nsReadingIterator<PRUnichar> iterEnd;

  mIMEString.BeginReading(iter);
  mIMEString.EndReading(iterEnd);

  // Handle the characters one at a time
  while (iter != iterEnd) {
    // Beware! This may flush notifications via synchronous
    // ScrollSelectionIntoView.
    if (NS_FAILED(HandleChar(*iter))) {
      // Character not found, exit loop early
      break;
    }
    ++iter;
  }

  mIMEString.Truncate(); // To be safe, so that find won't happen twice

  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::HandleQueryComposition(nsIDOMEvent* aCompositionEvent)
{
  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::HandleQueryReconversion(nsIDOMEvent* aCompositionEvent)
{
  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::HandleQueryCaretRect(nsIDOMEvent* aCompositionEvent)
{
  return NS_OK;
}


nsresult
nsTypeAheadFind::FindItNow(nsIPresShell *aPresShell,
                           PRBool aIsRepeatingSameChar, PRBool aIsLinksOnly,
                           PRBool aIsFirstVisiblePreferred)
{
  nsCOMPtr<nsIPresShell> presShell(aPresShell);
  nsCOMPtr<nsIPresShell> startingPresShell = GetPresShell();

  if (!presShell) {
    presShell = startingPresShell;  // this is the current document

    if (!presShell) {
      return NS_ERROR_FAILURE;
    }
  }

  nsCOMPtr<nsPresContext> presContext = presShell->GetPresContext();
  if (!presContext) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsISupports> startingContainer = presContext->GetContainer();
  nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(startingContainer));
  NS_ASSERTION(treeItem, "Bug 175321 Crashes with Type Ahead Find [@ nsTypeAheadFind::FindItNow]");
  if (!treeItem) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsIDocShellTreeItem> rootContentTreeItem;
  nsCOMPtr<nsIDocShell> currentDocShell;
  nsCOMPtr<nsIDocShell> startingDocShell(do_QueryInterface(startingContainer));

  treeItem->GetSameTypeRootTreeItem(getter_AddRefs(rootContentTreeItem));
  nsCOMPtr<nsIDocShell> rootContentDocShell =
    do_QueryInterface(rootContentTreeItem);

  if (!rootContentDocShell) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsISimpleEnumerator> docShellEnumerator;
  rootContentDocShell->GetDocShellEnumerator(nsIDocShellTreeItem::typeContent,
                                             nsIDocShell::ENUMERATE_FORWARDS,
                                             getter_AddRefs(docShellEnumerator));

  // Default: can start at the current document
  nsCOMPtr<nsISupports> currentContainer = startingContainer =
    do_QueryInterface(rootContentDocShell);

  // Iterate up to current shell, if there's more than 1 that we're
  // dealing with
  PRBool hasMoreDocShells;

  while (NS_SUCCEEDED(docShellEnumerator->HasMoreElements(&hasMoreDocShells))
         && hasMoreDocShells) {
    docShellEnumerator->GetNext(getter_AddRefs(currentContainer));
    currentDocShell = do_QueryInterface(currentContainer);
    if (!currentDocShell || currentDocShell == startingDocShell ||
        aIsFirstVisiblePreferred) {
      break;
    }
  }

  // ------------ Get ranges ready ----------------
  nsCOMPtr<nsIDOMRange> returnRange;
  if (NS_FAILED(GetSearchContainers(currentContainer, aIsRepeatingSameChar,
                                    aIsFirstVisiblePreferred, 
                                    !aIsFirstVisiblePreferred || mStartFindRange,
                                    getter_AddRefs(presShell),
                                    getter_AddRefs(presContext)))) {
    return NS_ERROR_FAILURE;
  }

  PRInt16 rangeCompareResult = 0;
  mStartPointRange->CompareBoundaryPoints(nsIDOMRange::START_TO_START,
                                          mSearchRange, &rangeCompareResult);
  // No need to wrap find in doc if starting at beginning
  PRBool hasWrapped = (rangeCompareResult <= 0);

  nsAutoString findBuffer;
  if (aIsRepeatingSameChar) {
    findBuffer = mTypeAheadBuffer.First();
  } else {
    findBuffer = PromiseFlatString(mTypeAheadBuffer);
  }

  if (findBuffer.IsEmpty())
    return NS_ERROR_FAILURE;

  mFind->SetFindBackwards(mRepeatingMode == eRepeatingCharReverse ||
    mRepeatingMode == eRepeatingReverse);

  while (PR_TRUE) {    // ----- Outer while loop: go through all docs -----
    while (PR_TRUE) {  // === Inner while loop: go through a single doc ===
      mFind->Find(findBuffer.get(), mSearchRange, mStartPointRange,
                  mEndPointRange, getter_AddRefs(returnRange));
      if (!returnRange) {
        break;  // Nothing found in this doc, go to outer loop (try next doc)
      }

      // ------- Test resulting found range for success conditions ------
      PRBool isInsideLink = PR_FALSE, isStartingLink = PR_FALSE;

      if (aIsLinksOnly) {
        // Don't check if inside link when searching all text

        RangeStartsInsideLink(returnRange, presShell, &isInsideLink,
                              &isStartingLink);
      }

      if (!IsRangeVisible(presShell, presContext, returnRange,
                          aIsFirstVisiblePreferred, PR_FALSE,
                          getter_AddRefs(mStartPointRange)) ||
          (aIsRepeatingSameChar && !isStartingLink) ||
          (aIsLinksOnly && !isInsideLink) ||
          (mStartLinksOnlyPref && aIsLinksOnly && !isStartingLink)) {
        // ------ Failure ------
        // Start find again from here
        returnRange->CloneRange(getter_AddRefs(mStartPointRange));

        // Collapse to end
        mStartPointRange->Collapse(mRepeatingMode == eRepeatingReverse || 
          mRepeatingMode == eRepeatingCharReverse);

        continue;
      }

      // ------ Success! -------
      // Make sure new document is selected
      if (presShell != startingPresShell) {
        // We are in a new document (because of frames/iframes)
        mFocusedDocSelection->CollapseToStart(); // Hide old doc's selection
        SetSelectionLook(startingPresShell, PR_FALSE, PR_FALSE); // hide caret

        nsIDocument *doc = presShell->GetDocument();
        if (!doc) {
          return NS_ERROR_FAILURE;
        }
        mFocusedWeakShell = do_GetWeakReference(presShell);

        // Get selection controller and selection for new frame/iframe
        GetSelection(presShell, getter_AddRefs(mFocusedDocSelCon), 
                     getter_AddRefs(mFocusedDocSelection));
      }
 
     if (!mFocusedDocSelection || !mFocusedDocSelCon) {
        // Apparently these can go away even though presshell/prescontext exist
        return NS_ERROR_FAILURE;
      }

      // Select the found text and focus it
      mFocusedDocSelection->RemoveAllRanges();
      mFocusedDocSelection->AddRange(returnRange);
      // After ScrollSelectionIntoView(), the pending notifications might be
      // flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
      mFocusedDocSelCon->ScrollSelectionIntoView(
                           nsISelectionController::SELECTION_NORMAL,
                           nsISelectionController::SELECTION_FOCUS_REGION,
                           PR_TRUE);
      SetSelectionLook(presShell, PR_TRUE, mRepeatingMode != eRepeatingForward 
                                           && mRepeatingMode != eRepeatingReverse);

      nsIEventStateManager *esm = presContext->EventStateManager();

      PRBool isSelectionWithFocus;
      esm->SetContentState(nsnull, NS_EVENT_STATE_FOCUS); // Start off focusing doc
      esm->MoveFocusToCaret(PR_TRUE, &isSelectionWithFocus);

      nsCOMPtr<nsIContent> focusedContent;
      esm->GetFocusedContent(getter_AddRefs(focusedContent));

      DisplayStatus(PR_TRUE, focusedContent, PR_FALSE);

      mBadKeysSinceMatch = 0;

      return NS_OK;
    }

    // ======= end-inner-while (go through a single document) ==========

    // ---------- Nothing found yet, try next document  -------------
    PRBool hasTriedFirstDoc = PR_FALSE;
    do {
      // ==== Second inner loop - get another while  ====
      if (NS_SUCCEEDED(docShellEnumerator->HasMoreElements(&hasMoreDocShells))
          && hasMoreDocShells) {
        docShellEnumerator->GetNext(getter_AddRefs(currentContainer));
        NS_ASSERTION(currentContainer, "HasMoreElements lied to us!");
        currentDocShell = do_QueryInterface(currentContainer);

        if (currentDocShell) {
          break;
        }
      }
      else if (hasTriedFirstDoc) {  // Avoid potential infinite loop
        return NS_ERROR_FAILURE;  // No content doc shells
      }

      // Reached last doc shell, loop around back to first doc shell
      rootContentDocShell->GetDocShellEnumerator(nsIDocShellTreeItem::typeContent,
                                                 nsIDocShell::ENUMERATE_FORWARDS,
                                                 getter_AddRefs(docShellEnumerator));
      hasTriedFirstDoc = PR_TRUE;
    } while (docShellEnumerator);  // ==== end second inner while  ===

    PRBool continueLoop = PR_FALSE;
    if (currentDocShell != startingDocShell) {
      continueLoop = PR_TRUE;  // Try next document
    }
    else if (!hasWrapped || aIsFirstVisiblePreferred) {
      // Finished searching through docshells:
      // If aFirstVisiblePreferred == PR_TRUE, we may need to go through all
      // docshells twice -once to look for visible matches, the second time
      // for any match
      aIsFirstVisiblePreferred = PR_FALSE;
      hasWrapped = PR_TRUE;
      continueLoop = PR_TRUE; // Go through all docs again
    }

    if (continueLoop) {
      if (NS_FAILED(GetSearchContainers(currentContainer,
                                        aIsRepeatingSameChar,
                                        aIsFirstVisiblePreferred, PR_FALSE,
                                        getter_AddRefs(presShell),
                                        getter_AddRefs(presContext)))) {
        return NS_ERROR_FAILURE;
      }

      if (mRepeatingMode == eRepeatingCharReverse ||
          mRepeatingMode == eRepeatingReverse) {
        // Reverse mode:
        // swap start and end points, so that we start
        // at end of document and go to beginning
        nsCOMPtr<nsIDOMRange> tempRange;
        mStartPointRange->CloneRange(getter_AddRefs(tempRange));
        mStartPointRange = mEndPointRange;
        mEndPointRange = tempRange;
      }

      continue;
    }

    // ------------- Failed --------------
    break;
  }   // end-outer-while: go through all docs

  return NS_ERROR_FAILURE;
}


nsresult
nsTypeAheadFind::GetSearchContainers(nsISupports *aContainer,
                                     PRBool aIsRepeatingSameChar,
                                     PRBool aIsFirstVisiblePreferred,
                                     PRBool aCanUseDocSelection,
                                     nsIPresShell **aPresShell,
                                     nsPresContext **aPresContext)
{
  NS_ENSURE_ARG_POINTER(aContainer);
  NS_ENSURE_ARG_POINTER(aPresShell);
  NS_ENSURE_ARG_POINTER(aPresContext);

  *aPresShell = nsnull;
  *aPresContext = nsnull;

  nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(aContainer));
  if (!docShell) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsPresContext> presContext;
  nsCOMPtr<nsIPresShell> presShell;

  docShell->GetPresShell(getter_AddRefs(presShell));
  docShell->GetPresContext(getter_AddRefs(presContext));

  if (!presShell || !presContext) {
    return NS_ERROR_FAILURE;
  }

  nsIDocument *doc = presShell->GetDocument();
  if (!doc) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsIContent> rootContent;
  nsCOMPtr<nsIDOMHTMLDocument> htmlDoc(do_QueryInterface(doc));
  if (htmlDoc) {
    nsCOMPtr<nsIDOMHTMLElement> bodyEl;
    htmlDoc->GetBody(getter_AddRefs(bodyEl));
    rootContent = do_QueryInterface(bodyEl);
  }
  if (!rootContent) {
    rootContent = doc->GetRootContent();
  }
  nsCOMPtr<nsIDOMNode> rootNode(do_QueryInterface(rootContent));

  if (!rootNode) {
    return NS_ERROR_FAILURE;
  }

  PRUint32 childCount = rootContent->GetChildCount();

  mSearchRange->SelectNodeContents(rootNode);

  mEndPointRange->SetEnd(rootNode, childCount);
  mEndPointRange->Collapse(PR_FALSE); // collapse to end

  // Consider current selection as null if
  // it's not in the currently focused document
  nsCOMPtr<nsIDOMRange> currentSelectionRange;
  nsCOMPtr<nsIPresShell> selectionPresShell = GetPresShell();

  if (aCanUseDocSelection && selectionPresShell == presShell && mFocusedDocSelection) {
    mFocusedDocSelection->GetRangeAt(0, getter_AddRefs(currentSelectionRange));
  }

  if (!currentSelectionRange) {
    // Ensure visible range, move forward if necessary
    // This uses ignores the return value, but usese the side effect of
    // IsRangeVisible. It returns the first visible range after searchRange
    IsRangeVisible(presShell, presContext, mSearchRange, 
                   aIsFirstVisiblePreferred, PR_TRUE, 
                   getter_AddRefs(mStartPointRange));
  }
  else {
    PRInt32 startOffset;
    nsCOMPtr<nsIDOMNode> startNode;
    if ((aIsRepeatingSameChar && mRepeatingMode != eRepeatingCharReverse) || 
        mRepeatingMode == eRepeatingForward) {
      currentSelectionRange->GetEndContainer(getter_AddRefs(startNode));
      currentSelectionRange->GetEndOffset(&startOffset);
    }
    else {
      currentSelectionRange->GetStartContainer(getter_AddRefs(startNode));
      currentSelectionRange->GetStartOffset(&startOffset);
    }
    if (!startNode) {
      startNode = rootNode;
    }

    // We need to set the start point this way, other methods haven't worked
    mStartPointRange->SelectNode(startNode);
    mStartPointRange->SetStart(startNode, startOffset);
  }

  mStartPointRange->Collapse(PR_TRUE); // collapse to start

  *aPresShell = presShell;
  NS_ADDREF(*aPresShell);

  *aPresContext = presContext;
  NS_ADDREF(*aPresContext);

  return NS_OK;
}


void
nsTypeAheadFind::RangeStartsInsideLink(nsIDOMRange *aRange,
                                       nsIPresShell *aPresShell,
                                       PRBool *aIsInsideLink,
                                       PRBool *aIsStartingLink)
{
  *aIsInsideLink = PR_FALSE;
  *aIsStartingLink = PR_TRUE;

  // ------- Get nsIContent to test -------
  nsCOMPtr<nsIDOMNode> startNode;
  nsCOMPtr<nsIContent> startContent, origContent;
  aRange->GetStartContainer(getter_AddRefs(startNode));
  PRInt32 startOffset;
  aRange->GetStartOffset(&startOffset);

  startContent = do_QueryInterface(startNode);
  if (!startContent) {
    NS_NOTREACHED("startContent should never be null");
    return;
  }
  origContent = startContent;

  if (startContent->IsNodeOfType(nsINode::eELEMENT)) {
    nsIContent *childContent = startContent->GetChildAt(startOffset);
    if (childContent) {
      startContent = childContent;
    }
  }
  else if (startOffset > 0) {
    const nsTextFragment *textFrag = startContent->GetText();
    if (textFrag) {
      // look for non whitespace character before start offset
      for (PRInt32 index = 0; index < startOffset; index++) {
        if (!XP_IS_SPACE(textFrag->CharAt(index))) {
          *aIsStartingLink = PR_FALSE;  // not at start of a node

          break;
        }
      }
    }
  }

  // ------- Check to see if inside link ---------

  // We now have the correct start node for the range
  // Search for links, starting with startNode, and going up parent chain

  nsCOMPtr<nsIAtom> tag, hrefAtom(do_GetAtom("href"));
  nsCOMPtr<nsIAtom> typeAtom(do_GetAtom("type"));

  while (PR_TRUE) {
    // Keep testing while textContent is equal to something,
    // eventually we'll run out of ancestors

    if (startContent->IsNodeOfType(nsINode::eHTML)) {
      nsCOMPtr<nsILink> link(do_QueryInterface(startContent));
      if (link) {
        // Check to see if inside HTML link
        *aIsInsideLink = startContent->HasAttr(kNameSpaceID_None, hrefAtom);
        return;
      }
    }
    else {
      // Any xml element can be an xlink
      *aIsInsideLink = startContent->HasAttr(kNameSpaceID_XLink, hrefAtom);
      if (*aIsInsideLink) {
        if (!startContent->AttrValueIs(kNameSpaceID_XLink, typeAtom,
                                       NS_LITERAL_STRING("simple"),
                                       eCaseMatters)) {
          *aIsInsideLink = PR_FALSE;  // Xlink must be type="simple"
        }

        return;
      }
    }

    // Get the parent
    nsCOMPtr<nsIContent> parent = startContent->GetParent();
    if (parent) {
      nsIContent *parentsFirstChild = parent->GetChildAt(0);
      // We don't want to look at a whitespace-only first child
      if (parentsFirstChild && parentsFirstChild->TextIsOnlyWhitespace())
        parentsFirstChild = parent->GetChildAt(1);

      if (parentsFirstChild != startContent) {
        // startContent wasn't a first child, so we conclude that
        // if this is inside a link, it's not at the beginning of it
        *aIsStartingLink = PR_FALSE;
      }

      startContent = parent;
    }
    else
      break;
  }

  *aIsStartingLink = PR_FALSE;
}


NS_IMETHODIMP
nsTypeAheadFind::ScrollPositionWillChange(nsIScrollableView *aView,
                                          nscoord aX, nscoord aY)
{
  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::ScrollPositionDidChange(nsIScrollableView *aScrollableView,
                                         nscoord aX, nscoord aY)
{
  if (!mIsFindingText)
    CancelFind();

  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::NotifySelectionChanged(nsIDOMDocument *aDoc,
                                        nsISelection *aSel, PRInt16 aReason)
{
  if (!mIsFindingText) {
    if (mRepeatingMode != eRepeatingNone) {
      // Selection had changed color for Type Ahead Find's version of Accel+G
      // We change it back when the selection changes from someone else
      nsCOMPtr<nsIPresShell> presShell(GetPresShell());
      SetSelectionLook(presShell, PR_FALSE, PR_FALSE);
    }
    CancelFind();
  }

  return NS_OK;
}


// ---------------- nsISuiteTypeAheadFind --------------------

NS_IMETHODIMP
nsTypeAheadFind::FindNext(PRBool aFindBackwards, nsISupportsInterfacePointer *aCallerWindowSupports)
{
  NS_ENSURE_TRUE(aCallerWindowSupports, NS_ERROR_FAILURE);

  // aCallerWindowSupports holds an nsISupports to the window the 
  // find next command was fired in
  // We clear out the window pointer when handling the find command ourselves.

  if (!mIsFindAllowedInWindow || mFindNextBuffer.IsEmpty() || !mFocusedWindow) {
    return NS_OK;
  }

  // Compare the top level content pres shell of typeaheadfind
  // with the top level content pres shell window where find next is happening
  // If they're different, exit so that webbrowswerfind can handle FindNext()

  nsCOMPtr<nsIPresShell> typeAheadPresShell(GetPresShell());
  NS_ENSURE_TRUE(typeAheadPresShell, NS_OK);

  nsPresContext *presContext = typeAheadPresShell->GetPresContext();
  NS_ENSURE_TRUE(presContext, NS_OK);

  nsCOMPtr<nsISupports> container = presContext->GetContainer();
  nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(container));
  NS_ENSURE_TRUE(treeItem, NS_OK);

  // Reget typeAheadPresShell to make sure we're 
  // comparing with the top content presshell
  GetTopContentPresShell(treeItem, getter_AddRefs(typeAheadPresShell));
  NS_ENSURE_TRUE(typeAheadPresShell, NS_OK);

  nsCOMPtr<nsISupports> callerWindowSupports;
  aCallerWindowSupports->GetData(getter_AddRefs(callerWindowSupports));
  nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(callerWindowSupports));
  NS_ENSURE_TRUE(ifreq, NS_ERROR_FAILURE);

  nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(ifreq));
  treeItem = do_QueryInterface(webNav);
  NS_ENSURE_TRUE(treeItem, NS_OK);

  nsCOMPtr<nsIPresShell> callerPresShell;
  GetTopContentPresShell(treeItem, getter_AddRefs(callerPresShell));
  NS_ENSURE_TRUE(callerPresShell, NS_OK);

  if (callerPresShell != typeAheadPresShell) {
    // This means typeaheadfind is active in a different window or doc
    // So it's not appropriate to find next for the current window
    mFindNextBuffer.Truncate();
    return NS_OK;
  }

  nsCOMPtr<nsIDOMWindow> callerWin(do_QueryInterface(callerWindowSupports));
  NS_ENSURE_TRUE(callerWin, NS_OK);

  nsCOMPtr<nsIWebBrowserFind> webBrowserFind;
  GetWebBrowserFind(callerWin, getter_AddRefs(webBrowserFind));
  NS_ENSURE_TRUE(webBrowserFind, NS_ERROR_FAILURE);

  nsXPIDLString webBrowserFindString;
  if (webBrowserFind) {
    webBrowserFind->GetSearchString(getter_Copies(webBrowserFindString));
    if (!webBrowserFindString.Equals(mFindNextBuffer)) {
      // If they're not equal, then the find dialog was used last,
      // not typeaheadfind. Typeaheadfind applies to the last find,
      // so we should let nsIWebBrowserFind::FindNext() do it.
      mFindNextBuffer.Truncate();
      return NS_OK;
    }

  }

  /* -------------------------------------------------------
   * Typeaheadfind is active in the currently focused window,
   * so do the find next operation now
   */

  // Clear out window data, to indicate we handled the findnext
  aCallerWindowSupports->SetData(nsnull); 

  if (mBadKeysSinceMatch > 0) {
    // We know it will fail, so just return
    return NS_OK;
  }

  mTypeAheadBuffer = mFindNextBuffer;
  PRBool repeatingSameChar = PR_FALSE;

  if (mRepeatingMode == eRepeatingChar || 
      mRepeatingMode == eRepeatingCharReverse) {
    mRepeatingMode = aFindBackwards? eRepeatingCharReverse: eRepeatingChar;
    repeatingSameChar = PR_TRUE;
  }
  else {
    mRepeatingMode = aFindBackwards? eRepeatingReverse: eRepeatingForward;
  }
  mLiteralTextSearchOnly = PR_TRUE;

  mIsFindingText = PR_TRUE; // prevent our listeners from calling CancelFind()

  // Beware! This may flush notifications via synchronous
  // ScrollSelectionIntoView.
  if (NS_FAILED(FindItNow(nsnull, repeatingSameChar, mLinksOnly, PR_FALSE))) {
    DisplayStatus(PR_FALSE, nsnull, PR_FALSE); // Display failure status
    mRepeatingMode = eRepeatingNone;
  }

  mTypeAheadBuffer.Truncate(); // Find buffer is now in mFindNextBuffer
  StartTimeout();
  mIsFindingText = PR_FALSE;

  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::GetIsActive(PRBool *aIsActive)
{
  *aIsActive = mLinksOnlyManuallySet || !mTypeAheadBuffer.IsEmpty();

  return NS_OK;
}


/*
 * Start new type ahead find manually
 */

NS_IMETHODIMP
nsTypeAheadFind::StartNewFind(nsIDOMWindow *aWindow, PRBool aLinksOnly)
{
  if (!mFind || !mIsTypeAheadOn || !aWindow)
    return NS_ERROR_FAILURE;  // Type Ahead Find not correctly initialized

  // This routine will set up the doc listeners
  // Do it first, it does a CancelFind()
  UseInWindow(aWindow);

  mLinksOnly = aLinksOnly;
  mLinksOnlyManuallySet = PR_TRUE;
  mRepeatingMode = eRepeatingNone;

  PRBool isAutoStartWin;
  GetAutoStart(mFocusedWindow, &isAutoStartWin);
  if (!isAutoStartWin) {
    AttachWindowListeners(mFocusedWindow);
  }

  if (mFocusedDocSelection) {
    mIsFindingText = PR_TRUE;  // Turn off side effects from selection listener
    mFocusedDocSelection->CollapseToStart();
    mIsFindingText = PR_FALSE;
    nsCOMPtr<nsIPresShell> presShell(GetPresShell());
    SetSelectionLook(presShell, PR_TRUE, PR_TRUE);
  }
  DisplayStatus(PR_TRUE, nsnull, PR_FALSE);
  StartTimeout();

  return NS_OK;
}

void
nsTypeAheadFind::ResetGlobalAutoStart(PRBool aAutoStart)
{
  // Enumerate through the current top level windows
  // and either attach or remove window listeners

  CancelFind();

  nsCOMPtr<nsIWindowWatcher> windowWatcher =
    do_GetService(NS_WINDOWWATCHER_CONTRACTID);
  if (!windowWatcher) {
    return;
  }

  nsCOMPtr<nsISimpleEnumerator> enumerator;
  windowWatcher->GetWindowEnumerator(getter_AddRefs(enumerator));
  if (!enumerator) {
    return;
  }

  PRBool hasMoreWindows;
  while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMoreWindows))
         && hasMoreWindows) {
    nsCOMPtr<nsISupports> supports;
    enumerator->GetNext(getter_AddRefs(supports));
    nsCOMPtr<nsIDOMWindow> domWin(do_QueryInterface(supports));
    if (domWin) {
      if (aAutoStart) {
        AttachWindowListeners(domWin);
      }
      else {
        RemoveWindowListeners(domWin);
      }
    }
  }
}


NS_IMETHODIMP
nsTypeAheadFind::SetAutoStart(nsIDOMWindow *aDOMWin, PRBool aAutoStartOn)
{
  if (!aDOMWin) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsISupports> windowSupports(do_QueryInterface(aDOMWin));
  PRInt32 index = mManualFindWindows->IndexOf(windowSupports);

  if (aAutoStartOn) {
    if (index >= 0) {
      // Remove from list of windows requiring manual find
      mManualFindWindows->RemoveElementAt(index);
    }
  }
  else {  // Should be in list of windows requiring manual find
    if (aDOMWin == mFocusedWindow) {
      CancelFind();
    }

    if (index < 0) {  // Should be in list of windows requiring manual find
      mManualFindWindows->InsertElementAt(windowSupports, 0);
    }
  }

  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::GetAutoStart(nsIDOMWindow *aDOMWin, PRBool *aIsAutoStartOn)
{
  *aIsAutoStartOn = PR_FALSE;

  if (!mAutoStartPref || !aDOMWin)
    return NS_OK;

  nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(aDOMWin));
  NS_ENSURE_TRUE(ifreq, NS_OK);

  nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(ifreq));
  nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(webNav));
  nsCOMPtr<nsIEditorDocShell> editorDocShell(do_QueryInterface(treeItem));
  if (editorDocShell) {
    PRBool isEditable;
    editorDocShell->GetEditable(&isEditable);

    if (isEditable) {
      return NS_OK;
    }
  }

  nsCOMPtr<nsIDOMDocument> domDoc;
  aDOMWin->GetDocument(getter_AddRefs(domDoc));
  nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
  NS_ENSURE_TRUE(doc, NS_OK);

  nsCOMPtr<nsIDOMXULDocument> xulDoc(do_QueryInterface(doc));
  nsCOMPtr<nsIImageDocument> imageDoc(do_QueryInterface(doc));
  if (xulDoc || imageDoc) {
    return NS_OK; // Avoid any xul docs, whether in chrome or content
  }

  if (mLinksOnlyPref) {
    nsAutoString contentType;
    doc->GetContentType(contentType);
    if (contentType.EqualsLiteral("text/plain")) {
      return NS_OK; // No auto link search in plain text pages
    }
  }

  nsIDocument *parentDoc = doc->GetParentDocument();
  if (parentDoc) {
    // get content for <browser>
    nsCOMPtr<nsIDOMElement> browserElement =
      do_QueryInterface(parentDoc->FindContentForSubDocument(doc));

    if (browserElement) {
      nsAutoString tagName, autoFind, test;
      browserElement->GetLocalName(tagName);
      browserElement->GetAttribute(NS_LITERAL_STRING("type"), test);
      browserElement->GetAttribute(NS_LITERAL_STRING("autofind"), autoFind);
      if (tagName.EqualsLiteral("editor") || 
          autoFind.EqualsLiteral("false")) {
        return NS_OK;
      }
    }
  }

  // Is this window stored in manual find windows list?
  nsCOMPtr<nsISupports> windowSupports(do_QueryInterface(aDOMWin));
  *aIsAutoStartOn = mManualFindWindows->IndexOf(windowSupports) < 0;

  return NS_OK;
}


NS_IMETHODIMP
nsTypeAheadFind::CancelFind()
{
  // Stop current find if:
  //   1. Escape pressed
  //   2. Selection is moved/changed
  //   3. User clicks in window (if it changes the selection)
  //   4. Window scrolls
  //   5. User tabs (this can move the selection)
  //   6. Timer expires

  if (mLinksOnlyManuallySet == PR_FALSE && mTypeAheadBuffer.IsEmpty()) {
    // Nothing to cancel
    return NS_OK;
  }

  if (mIsTypeAheadOn || mRepeatingMode != eRepeatingNone) {
    mTypeAheadBuffer.Truncate();
    DisplayStatus(PR_FALSE, nsnull, PR_TRUE); // Clear status
    nsCOMPtr<nsIPresShell> presShell(GetPresShell());
    SetSelectionLook(presShell, PR_FALSE, PR_FALSE);
  }

  // This is set to true if the user types / (all text) or ' (links only) first
  mLinksOnlyManuallySet = PR_FALSE;

  // These will be initialized to their true values after
  // the first character is typed
  mLiteralTextSearchOnly = PR_FALSE;
  mDontTryExactMatch = PR_FALSE;
  mStartFindRange = nsnull;
  mBadKeysSinceMatch = 0;
  mIsBackspaceProtectOn = PR_FALSE;
  mLastBadChar = 0;
  mAllTheSameChar = PR_TRUE; // Until at least 2 different chars are typed

  if (mTimer) {
    mTimer->Cancel();
    mTimer = nsnull;
  }

  PRBool isAutoStartWin;
  GetAutoStart(mFocusedWindow, &isAutoStartWin);
  if (!isAutoStartWin) {
    RemoveDocListeners();
    RemoveWindowListeners(mFocusedWindow);
    mIsFindAllowedInWindow = PR_FALSE;
    mFocusedWindow = nsnull;
  }

  return NS_OK;
}


// ------- Helper Methods ---------------

void 
nsTypeAheadFind::GetTopContentPresShell(nsIDocShellTreeItem *aDocShellTreeItem, 
                                        nsIPresShell **aPresShell)
{
  *aPresShell = nsnull;

  nsCOMPtr<nsIDocShellTreeItem> topContentTreeItem;
  aDocShellTreeItem->GetSameTypeRootTreeItem(getter_AddRefs(topContentTreeItem));
  nsCOMPtr<nsIDocShell> topContentDocShell(do_QueryInterface(topContentTreeItem));

  if (!topContentDocShell)
    return;

  topContentDocShell->GetPresShell(aPresShell);
}

void 
nsTypeAheadFind::GetStartWindow(nsIDOMWindow *aWindow, nsIDOMWindow **aStartWindow)
{
  // Return the root ancestor content window of aWindow

  *aStartWindow = nsnull;
  nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(aWindow));
  NS_ASSERTION(ifreq, "Can't get interface requestor");
  if (!ifreq)
    return;

  nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(ifreq));
  nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(webNav));
  NS_ASSERTION(ifreq, "Can't get doc shell tree item");
  if (!treeItem)
    return;
  
  PRInt32 docShellType;
  treeItem->GetItemType(&docShellType);
  if (docShellType == nsIDocShellTreeItem::typeContent) {
    nsCOMPtr<nsIDocShellTreeItem> rootContentTreeItem;
    treeItem->GetSameTypeRootTreeItem(getter_AddRefs(rootContentTreeItem));
    nsCOMPtr<nsIDOMWindow> domWin(do_GetInterface(rootContentTreeItem));
    *aStartWindow = domWin;
  }
  else {
    *aStartWindow = aWindow;
  }

  NS_IF_ADDREF(*aStartWindow);
}

nsresult
nsTypeAheadFind::GetWebBrowserFind(nsIDOMWindow *aWin, 
                                   nsIWebBrowserFind **aWebBrowserFind)
{
  NS_ENSURE_ARG_POINTER(aWin);
  NS_ENSURE_ARG_POINTER(aWebBrowserFind);

  *aWebBrowserFind = nsnull;

  nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(aWin));
  NS_ENSURE_TRUE(ifreq, NS_ERROR_FAILURE);

  nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(ifreq));
  nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(webNav));
  NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);

  nsCOMPtr<nsIWebBrowserFind> webBrowserFind(do_GetInterface(docShell));
  NS_ENSURE_TRUE(webBrowserFind, NS_ERROR_FAILURE);

  NS_ADDREF(*aWebBrowserFind = webBrowserFind);

  return NS_OK;
}


void
nsTypeAheadFind::StartTimeout()
{
  if (mTimeoutLength) {
    if (!mTimer) {
      mTimer = do_CreateInstance("@mozilla.org/timer;1");
      if (mTimer) {
        mTimer->InitWithCallback(this, mTimeoutLength, nsITimer::TYPE_ONE_SHOT);
      }
    }
    else {
      mTimer->SetDelay(mTimeoutLength);
    }
  }
}

void
nsTypeAheadFind::SetSelectionLook(nsIPresShell *aPresShell, 
                                  PRBool aChangeColor, 
                                  PRBool aEnabled)
{
  if (!aPresShell || !mFocusedDocSelCon)
    return;

  // Show caret when type ahead find is on
  // Also paint selection bright (typeaheadfind on) or normal
  // (typeaheadfind off)

  if (aChangeColor) {
    mFocusedDocSelCon->SetDisplaySelection(nsISelectionController::SELECTION_ATTENTION);
  } else {
    mFocusedDocSelCon->SetDisplaySelection(nsISelectionController::SELECTION_ON);
  }

  mFocusedDocSelCon->RepaintSelection(nsISelectionController::SELECTION_NORMAL);

  if (mCaretBrowsingOn) {
    return;  // Leave caret visibility as it is
  }

  nsCOMPtr<nsICaret> caret;
  aPresShell->GetCaret(getter_AddRefs(caret));
  nsCOMPtr<nsILookAndFeel> lookNFeel(do_GetService(kLookAndFeelCID));
  if (!caret || !lookNFeel) {
    return;
  }

  if (aEnabled) {
    // Set caret visible so that it's obvious we're in a live mode
    caret->SetCaretDOMSelection(mFocusedDocSelection);
    caret->SetVisibilityDuringSelection(PR_TRUE);
    caret->SetCaretVisible(PR_TRUE);
    mFocusedDocSelCon->SetCaretEnabled(PR_TRUE);
  }
  else {
    PRInt32 isCaretVisibleDuringSelection = 0;
    lookNFeel->GetMetric(nsILookAndFeel::eMetric_ShowCaretDuringSelection,
                         isCaretVisibleDuringSelection);
    caret->SetVisibilityDuringSelection(isCaretVisibleDuringSelection != 0);
    nsCOMPtr<nsISelection> caretDomSelection;
    caret->GetCaretDOMSelection(getter_AddRefs(caretDomSelection));
    if (mFocusedDocSelection == caretDomSelection)  {
      mFocusedDocSelCon->SetCaretEnabled(isCaretVisibleDuringSelection != 0);
    }
  }
}


void
nsTypeAheadFind::RemoveDocListeners()
{
  nsCOMPtr<nsIPresShell> presShell(GetPresShell());
  nsIViewManager* vm = nsnull;

  if (presShell) {
    vm = presShell->GetViewManager();
  }

  nsIScrollableView* scrollableView = nsnull;
  if (vm) {
    vm->GetRootScrollableView(&scrollableView);
  }

  if (scrollableView) {
    scrollableView->RemoveScrollPositionListener(this);
  }

  mFocusedWeakShell = nsnull;

  // Remove selection listener
  nsCOMPtr<nsISelectionPrivate> selPrivate =
    do_QueryInterface(mFocusedDocSelection);

  if (selPrivate) {
    selPrivate->RemoveSelectionListener(this); // remove us if we're a listener
  }

  mFocusedDocSelection = nsnull;
  mFocusedDocSelCon = nsnull; // Selection controller owns pres shell!
}


void
nsTypeAheadFind::AttachDocListeners(nsIPresShell *aPresShell)
{
  if (!aPresShell) {
    return;
  }

  nsIViewManager* vm = aPresShell->GetViewManager();
  if (!vm) {
    return;
  }

  nsIScrollableView* scrollableView = nsnull;
  vm->GetRootScrollableView(&scrollableView);
  if (!scrollableView) {
    return;
  }

  scrollableView->AddScrollPositionListener(this);

  // Attach selection listener
  nsCOMPtr<nsISelectionPrivate> selPrivate =
    do_QueryInterface(mFocusedDocSelection);

  if (selPrivate) {
    selPrivate->AddSelectionListener(this);
  }
}


void
nsTypeAheadFind::RemoveWindowListeners(nsIDOMWindow *aDOMWin)
{
  nsCOMPtr<nsIDOMEventTarget> chromeEventHandler;
  GetChromeEventHandler(aDOMWin, getter_AddRefs(chromeEventHandler));
  if (!chromeEventHandler) {
    return;
  }

  // Use capturing, otherwise the normal find next will get activated when ours should
  nsCOMPtr<nsPIDOMEventTarget> piTarget(do_QueryInterface(chromeEventHandler));
  nsCOMPtr<nsIDOMEventGroup> systemGroup;
  piTarget->GetSystemEventGroup(getter_AddRefs(systemGroup));
  nsCOMPtr<nsIDOM3EventTarget> target(do_QueryInterface(piTarget));

  target->RemoveGroupedEventListener(NS_LITERAL_STRING("keypress"),
                                     static_cast<nsIDOMKeyListener*>(this),
                                     PR_FALSE, systemGroup);

  if (aDOMWin == mFocusedWindow) {
    mFocusedWindow = nsnull;
  }

  // Remove menu listeners
  nsIDOMEventListener *genericEventListener = 
    static_cast<nsIDOMEventListener*>(static_cast<nsIDOMKeyListener*>(this));

  chromeEventHandler->RemoveEventListener(NS_LITERAL_STRING("popupshown"), 
                                          genericEventListener, 
                                          PR_TRUE);

  chromeEventHandler->RemoveEventListener(NS_LITERAL_STRING("popuphidden"), 
                                          genericEventListener, 
                                          PR_TRUE);

  chromeEventHandler->RemoveEventListener(NS_LITERAL_STRING("DOMMenuBarActive"), 
                                          genericEventListener, 
                                          PR_TRUE);

  chromeEventHandler->RemoveEventListener(NS_LITERAL_STRING("DOMMenuBarInactive"), 
                                          genericEventListener, 
                                          PR_TRUE);

  chromeEventHandler->RemoveEventListener(NS_LITERAL_STRING("unload"), 
                                          genericEventListener, 
                                          PR_TRUE);

  // Remove DOM Text listener for IME text events
  piTarget->RemoveEventListenerByIID(static_cast<nsIDOMTextListener*>(this), 
    NS_GET_IID(nsIDOMTextListener));
  piTarget->RemoveEventListenerByIID(static_cast<nsIDOMCompositionListener*>(this), 
    NS_GET_IID(nsIDOMCompositionListener));
}


void
nsTypeAheadFind::AttachWindowListeners(nsIDOMWindow *aDOMWin)
{
  nsCOMPtr<nsIDOMEventTarget> chromeEventHandler;
  GetChromeEventHandler(aDOMWin, getter_AddRefs(chromeEventHandler));
  if (!chromeEventHandler) {
    return;
  }

  // Use capturing, otherwise the normal find next will get activated when ours should
  nsCOMPtr<nsPIDOMEventTarget> piTarget(do_QueryInterface(chromeEventHandler));
  nsCOMPtr<nsIDOMEventGroup> systemGroup;
  piTarget->GetSystemEventGroup(getter_AddRefs(systemGroup));
  nsCOMPtr<nsIDOM3EventTarget> target(do_QueryInterface(piTarget));

  target->AddGroupedEventListener(NS_LITERAL_STRING("keypress"),
                                  static_cast<nsIDOMKeyListener*>(this),
                                  PR_FALSE, systemGroup);

  // Attach menu listeners, this will help us ignore keystrokes meant for menus
  nsIDOMEventListener *genericEventListener = 
    static_cast<nsIDOMEventListener*>(static_cast<nsIDOMKeyListener*>(this));

  chromeEventHandler->AddEventListener(NS_LITERAL_STRING("popupshown"), 
                                       genericEventListener, 
                                       PR_TRUE);

  chromeEventHandler->AddEventListener(NS_LITERAL_STRING("popuphidden"), 
                                        genericEventListener, 
                                       PR_TRUE);

  chromeEventHandler->AddEventListener(NS_LITERAL_STRING("DOMMenuBarActive"), 
                                       genericEventListener, 
                                       PR_TRUE);
  
  chromeEventHandler->AddEventListener(NS_LITERAL_STRING("DOMMenuBarInactive"), 
                                       genericEventListener, 
                                       PR_TRUE);

  chromeEventHandler->AddEventListener(NS_LITERAL_STRING("unload"), 
                                       genericEventListener, 
                                       PR_TRUE);

  // Add DOM Text listener for IME text events
  piTarget->AddEventListenerByIID(static_cast<nsIDOMTextListener*>(this),
    NS_GET_IID(nsIDOMTextListener));
  piTarget->AddEventListenerByIID(static_cast<nsIDOMCompositionListener*>(this),
    NS_GET_IID(nsIDOMCompositionListener));
}


void
nsTypeAheadFind::GetChromeEventHandler(nsIDOMWindow *aDOMWin,
                                       nsIDOMEventTarget **aChromeTarget)
{
  nsCOMPtr<nsPIDOMWindow> privateDOMWindow(do_QueryInterface(aDOMWin));
  nsPIDOMEventTarget* chromeEventHandler = nsnull;
  if (privateDOMWindow) {
    chromeEventHandler = privateDOMWindow->GetChromeEventHandler();
  }

  nsCOMPtr<nsIDOMEventTarget> target(do_QueryInterface(chromeEventHandler));

  *aChromeTarget = target;
  NS_IF_ADDREF(*aChromeTarget);
}

PRBool
nsTypeAheadFind::IsTargetContentOkay(nsIContent *aContent)
{
  if (!aContent) {
    return PR_FALSE;
  }

  if (aContent->IsNodeOfType(nsINode::eHTML_FORM_CONTROL)) {
    nsCOMPtr<nsIFormControl> formControl(do_QueryInterface(aContent));
    PRInt32 controlType = formControl->GetType();
    if (controlType == NS_FORM_SELECT || 
        controlType == NS_FORM_TEXTAREA ||
        controlType == NS_FORM_INPUT_TEXT ||
        controlType == NS_FORM_INPUT_PASSWORD ||
        controlType == NS_FORM_INPUT_FILE) {
      // Don't steal keys from these form controls 
      // - selects have their own incremental find for options
      // - text fields need to allow typing
      return PR_FALSE;
    }
  }
  else if (aContent->IsNodeOfType(nsINode::eHTML)) {
    // Test for isindex, a deprecated kind of text field. We're using a string 
    // compare because <isindex> is not considered a form control, so it does 
    // not support nsIFormControl or eHTML_FORM_CONTROL, and it's not worth 
    // having a table of atoms just for it. Instead, we're paying for 1 extra 
    // string compare per keystroke, which isn't too bad.
    const char *tagStr;
    aContent->Tag()->GetUTF8String(&tagStr);
    if (strcmp(tagStr, "isindex") == 0) {
      return PR_FALSE;
    }
  }

  return PR_TRUE;
}


nsresult
nsTypeAheadFind::GetTargetIfTypeAheadOkay(nsIDOMEvent *aEvent, 
                                          nsIContent **aTargetContent,
                                          nsIPresShell **aTargetPresShell)
{
  NS_ENSURE_ARG_POINTER(aEvent);
  NS_ENSURE_ARG_POINTER(aTargetContent);
  NS_ENSURE_ARG_POINTER(aTargetPresShell);

  *aTargetContent = nsnull;
  *aTargetPresShell = nsnull;

  nsCOMPtr<nsIDOMNSEvent> nsEvent(do_QueryInterface(aEvent));
  if (!nsEvent) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsIDOMEventTarget> domEventTarget;
  nsEvent->GetOriginalTarget(getter_AddRefs(domEventTarget));

  nsCOMPtr<nsIContent> targetContent(do_QueryInterface(domEventTarget));

  // ---- Exit early if in form controls that can be typed in ---------

  if (!IsTargetContentOkay(targetContent)) {
    if (!mTypeAheadBuffer.IsEmpty()) {
      CancelFind();
    }
    return NS_OK;
  }

  NS_ADDREF(*aTargetContent = targetContent);

  // ---------- Is the keystroke in a new window? -------------------

  nsCOMPtr<nsIDocument> doc = targetContent->GetDocument();
  if (!doc) {
    return NS_OK;
  }

  nsIDOMWindow *domWin = doc->GetWindow();
  nsCOMPtr<nsIDOMWindow> topContentWin;
  GetStartWindow(domWin, getter_AddRefs(topContentWin));

  // ---------- Get presshell -----------

  nsIPresShell *presShell = doc->GetPrimaryShell();
  if (!presShell) {
    return NS_OK;
  }

  nsCOMPtr<nsIPresShell> lastShell(GetPresShell());

  if (lastShell != presShell || topContentWin != mFocusedWindow) {
    GetAutoStart(topContentWin, &mIsFindAllowedInWindow);
    if (mIsFindAllowedInWindow) {
      UseInWindow(topContentWin);
    }
    else {
      CancelFind();
      mFocusedWindow = nsnull;
    }
  }
  if (!mIsFindAllowedInWindow) {
    return NS_OK;
  }

  if (presShell->GetPresContext()->Type() == nsPresContext::eContext_PrintPreview) {
    // Typeaheadfind is not designed to work in print preview.
    // You can't navigate through the links there.
    if (lastShell != presShell) {
      mFocusedWeakShell = do_GetWeakReference(presShell);
      CancelFind();
      DisplayStatus(PR_FALSE, nsnull, PR_TRUE, EmptyString().get());  // Clear status
    }
    return NS_OK;
  }
  
  NS_ADDREF(*aTargetPresShell = presShell);  
  return NS_OK;
}


void
nsTypeAheadFind::GetSelection(nsIPresShell *aPresShell,
                              nsISelectionController **aSelCon,
                              nsISelection **aDOMSel)
{
  // if aCurrentNode is nsnull, get selection for document
  *aDOMSel = nsnull;

  nsPresContext *presContext = aPresShell->GetPresContext();

  nsIFrame *frame = aPresShell->GetRootFrame();

  if (presContext && frame) {
    frame->GetSelectionController(presContext, aSelCon);
    if (*aSelCon) {
      (*aSelCon)->GetSelection(nsISelectionController::SELECTION_NORMAL,
                               aDOMSel);
    }
  }
}


PRBool
nsTypeAheadFind::IsRangeVisible(nsIPresShell *aPresShell,
                                nsPresContext *aPresContext,
                                nsIDOMRange *aRange, PRBool aMustBeInViewPort,
                                PRBool aGetTopVisibleLeaf,
                                nsIDOMRange **aFirstVisibleRange)
{
  NS_ENSURE_ARG_POINTER(aPresShell);
  NS_ENSURE_ARG_POINTER(aPresContext);
  NS_ENSURE_ARG_POINTER(aRange);
  NS_ENSURE_ARG_POINTER(aFirstVisibleRange);

  // We need to know if the range start is visible.
  // Otherwise, return a the first visible range start 
  // in aFirstVisibleRange

  aRange->CloneRange(aFirstVisibleRange);
  nsCOMPtr<nsIDOMNode> node;
  aRange->GetStartContainer(getter_AddRefs(node));

  nsCOMPtr<nsIContent> content(do_QueryInterface(node));
  if (!content) {
    return PR_FALSE;
  }

  nsIFrame *frame = aPresShell->GetPrimaryFrameFor(content);
  if (!frame) {
    // No frame! Not visible then.

    return PR_FALSE;
  }

  if (!frame->GetStyleVisibility()->IsVisible()) {
    return PR_FALSE;
  }


  // ---- We have a frame ----
  if (!aMustBeInViewPort) {
    //  Don't need it to be on screen, just in rendering tree

    return PR_TRUE;
  }

  // Get the next in flow frame that contains the range start
  PRInt32 startRangeOffset, startFrameOffset, endFrameOffset;
  aRange->GetStartOffset(&startRangeOffset);
  while (PR_TRUE) {
    frame->GetOffsets(startFrameOffset, endFrameOffset);
    if (startRangeOffset < endFrameOffset) {
      break;
    }
    nsIFrame *nextContinuationFrame = frame->GetNextContinuation();
    if (nextContinuationFrame) {
      frame = nextContinuationFrame;
    }
    else {
      break;
    }
  }

  // Set up the variables we need, return true if we can't get at them all
  const PRUint16 kMinPixels  = 12;
  PRUint16 minPixels = PRUint16(nsPresContext::CSSPixelsToAppUnits(kMinPixels));

  nsIViewManager* viewManager = aPresShell->GetViewManager();
  if (!viewManager) {
    return PR_TRUE;
  }

  // Get the bounds of the current frame, relative to the current view.
  // We don't use the more accurate AccGetBounds, because that is
  // more expensive and the STATE_OFFSCREEN flag that this is used
  // for only needs to be a rough indicator
  nsIView *containingView = nsnull;
  nsPoint frameOffset;
  nsRectVisibility rectVisibility = nsRectVisibility_kAboveViewport;

  if (!aGetTopVisibleLeaf) {
    nsRect relFrameRect = frame->GetRect();
    frame->GetOffsetFromView(frameOffset, &containingView);
    if (!containingView) {
      // no view -- not visible

      return PR_FALSE;
    }

    relFrameRect.x = frameOffset.x;
    relFrameRect.y = frameOffset.y;

    viewManager->GetRectVisibility(containingView, relFrameRect,
                                   minPixels,
                                   &rectVisibility);

    if (rectVisibility != nsRectVisibility_kAboveViewport &&
        rectVisibility != nsRectVisibility_kZeroAreaRect) {
      return PR_TRUE;
    }
  }

  // We know that the target range isn't usable because it's not in the
  // view port. Move range forward to first visible point,
  // this speeds us up a lot in long documents
  nsCOMPtr<nsIBidirectionalEnumerator> frameTraversal;
  nsCOMPtr<nsIFrameTraversal> trav(do_CreateInstance(kFrameTraversalCID));
  if (trav) {
    trav->NewFrameTraversal(getter_AddRefs(frameTraversal),
                            aPresContext, frame,
                            eLeaf,
                            PR_FALSE, // aVisual
                            PR_FALSE, // aLockInScrollView
                            PR_FALSE  // aFollowOOFs
                            );
  }

  if (!frameTraversal) {
    return PR_FALSE;
  }

  while (rectVisibility == nsRectVisibility_kAboveViewport ||
         rectVisibility == nsRectVisibility_kZeroAreaRect) {
    frameTraversal->Next();
    nsISupports* currentItem;
    frameTraversal->CurrentItem(&currentItem);
    frame = static_cast<nsIFrame*>(currentItem);
    if (!frame) {
      return PR_FALSE;
    }

    nsRect relFrameRect = frame->GetRect();
    frame->GetOffsetFromView(frameOffset, &containingView);
    if (containingView) {
      relFrameRect.x = frameOffset.x;
      relFrameRect.y = frameOffset.y;
      viewManager->GetRectVisibility(containingView, relFrameRect,
                                     minPixels, &rectVisibility);
    }
  }

  if (frame) {
    nsCOMPtr<nsIDOMNode> firstVisibleNode =
      do_QueryInterface(frame->GetContent());

    if (firstVisibleNode) {
      (*aFirstVisibleRange)->SelectNode(firstVisibleNode);
      frame->GetOffsets(startFrameOffset, endFrameOffset);
      (*aFirstVisibleRange)->SetStart(firstVisibleNode, startFrameOffset);
      (*aFirstVisibleRange)->Collapse(PR_TRUE);  // Collapse to start
    }
  }

  return PR_FALSE;
}


nsresult
nsTypeAheadFind::GetTranslatedString(const nsAString& aKey,
                                     nsAString& aStringOut)
{
  nsXPIDLString xsValue;

  if (!mStringBundle ||
    NS_FAILED(mStringBundle->GetStringFromName(PromiseFlatString(aKey).get(),
                                               getter_Copies(xsValue)))) {
    return NS_ERROR_FAILURE;
  }

  aStringOut.Assign(xsValue);

  return NS_OK;
}


void
nsTypeAheadFind::DisplayStatus(PRBool aSuccess, nsIContent *aFocusedContent,
                               PRBool aClearStatus, const PRUnichar *aText)
{
  // pres shell -> pres context -> container -> tree item ->
  // tree owner -> browser chrome

  nsCOMPtr<nsIPresShell> presShell(GetPresShell());
  if (!presShell) {
    return;
  }

  nsPresContext *presContext = presShell->GetPresContext();
  if (!presContext) {
    return;
  }

  nsCOMPtr<nsISupports> pcContainer = presContext->GetContainer();
  nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(pcContainer));
  if (!treeItem) {
    return;
  }

  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
  treeItem->GetTreeOwner(getter_AddRefs(treeOwner));
  if (!treeOwner) {
    return;
  }

  nsCOMPtr<nsIWebBrowserChrome> browserChrome(do_GetInterface(treeOwner));
  if (!browserChrome) {
    return;
  }

  nsAutoString statusString;
  if (aText) 
    statusString = aText;
  else {
    if (aClearStatus) {
      GetTranslatedString(NS_LITERAL_STRING("stopfind"), statusString);
    } else if (aSuccess && mTypeAheadBuffer.IsEmpty()) {
      // When find has been started manually
      // but no characters have been typed yet
      nsAutoString key;

      if (mLinksOnly) {
        key.AssignLiteral("startlinkfind");
      } else {
        key.AssignLiteral("starttextfind");
      }
      GetTranslatedString(key, statusString);
    } else {
      nsAutoString key;

      if (mLinksOnly) {
        key.AssignLiteral("link");
      } else {
        key.AssignLiteral("text");
      }

      if (!aSuccess) {
        key.AppendLiteral("not");
      }

      key.AppendLiteral("found");

      if (NS_SUCCEEDED(GetTranslatedString(key, statusString))) {
        if (mRepeatingMode == eRepeatingChar || 
            mRepeatingMode == eRepeatingCharReverse) {
          statusString += mTypeAheadBuffer.First();
        }
        else {
          statusString += mTypeAheadBuffer;
        }

        nsAutoString closeQuoteString, urlString;
        GetTranslatedString(NS_LITERAL_STRING("closequote"), closeQuoteString);
        statusString += closeQuoteString;

        if (mRepeatingMode != eRepeatingNone) {
          if (mRepeatingMode == eRepeatingChar) {
            key.AssignLiteral("repeated");
          }
          else if (mRepeatingMode == eRepeatingForward) {
            key.AssignLiteral("nextmatch");
          }
          else {
            key.AssignLiteral("prevmatch");
          }
          nsAutoString repeatedModeString;
          GetTranslatedString(key, repeatedModeString);
          statusString += NS_LITERAL_STRING(" ") + repeatedModeString;
        }

        nsCOMPtr<nsIDOMNode> focusedNode(do_QueryInterface(aFocusedContent));
        if (focusedNode) {
          presShell->GetLinkLocation(focusedNode, urlString);
        }

        if (!urlString.IsEmpty()) {   // Add URL in parenthesis
          nsAutoString openParenString, closeParenString;
          GetTranslatedString(NS_LITERAL_STRING("openparen"), openParenString);
          GetTranslatedString(NS_LITERAL_STRING("closeparen"), closeParenString);
          statusString += NS_LITERAL_STRING("   ") + openParenString
                          + urlString + closeParenString;
        }
      }
    }
  }

  browserChrome->SetStatus(nsIWebBrowserChrome::STATUS_LINK,
                           PromiseFlatString(statusString).get());
}


// ------- nsTypeAheadController ---------------

const char * const sLinkFindString = "cmd_findTypeLinks";
const char * const sTextFindString = "cmd_findTypeText";

NS_IMPL_ISUPPORTS1(nsTypeAheadController, nsIController)

nsTypeAheadController::nsTypeAheadController(nsIFocusController *aFocusController):
  mFocusController(aFocusController)
{
}

nsTypeAheadController::~nsTypeAheadController()
{
}

NS_IMETHODIMP
nsTypeAheadController::IsCommandEnabled(const char *aCommand, PRBool *aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);

  *aResult = PR_FALSE;

  NS_ENSURE_TRUE(mFocusController, NS_ERROR_FAILURE);

  nsCOMPtr<nsIDOMElement> focusedElement;
  mFocusController->GetFocusedElement(getter_AddRefs(focusedElement));

  nsCOMPtr<nsIContent> focusedContent(do_QueryInterface(focusedElement));

  // Make sure we're not focused on a text field, listbox
  // or other form control that needs typeahead keystrokes
  if (focusedContent) {
    *aResult = nsTypeAheadFind::IsTargetContentOkay(focusedContent);
    return NS_OK;
  }

  // We're focused on a document
  nsCOMPtr<nsIDOMWindowInternal> winInternal;
  mFocusController->GetFocusedWindow(getter_AddRefs(winInternal));
  nsCOMPtr<nsIDOMWindow> domWin(do_QueryInterface(winInternal));
  if (!domWin) {
    return NS_OK;
  }

  *aResult = PR_TRUE;

  // Make sure we're not in Midas editing mode
  nsCOMPtr<nsIDOMDocument> domDoc;
  domWin->GetDocument(getter_AddRefs(domDoc));
  nsCOMPtr<nsIDOMNSHTMLDocument> htmlDoc(do_QueryInterface(domDoc));
  if (htmlDoc) {
    nsAutoString designMode;
    htmlDoc->GetDesignMode(designMode);
    if (designMode.EqualsLiteral("on")) {
      *aResult = PR_FALSE;
    }
  }
  
  return NS_OK;
}

NS_IMETHODIMP
nsTypeAheadController::SupportsCommand(const char *aCommand, PRBool *aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);

  *aResult = PR_FALSE;

  if (!nsCRT::strcmp(sLinkFindString, aCommand) ||
      !nsCRT::strcmp(sTextFindString, aCommand)) {
    *aResult = PR_TRUE;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsTypeAheadController::DoCommand(const char *aCommand)
{
  PRBool isLinkSearch = PR_FALSE;

  if (nsCRT::strcmp(sLinkFindString, aCommand) == 0) {
    isLinkSearch = PR_TRUE;
  }
  else if (nsCRT::strcmp(sTextFindString, aCommand) != 0) {
    return NS_OK;
  }

  NS_ENSURE_TRUE(mFocusController, NS_ERROR_FAILURE);

  nsCOMPtr<nsIDOMWindowInternal> domWinInternal;
  mFocusController->GetFocusedWindow(getter_AddRefs(domWinInternal));

  nsCOMPtr<nsIDOMWindow> startContentWin;
  EnsureContentWindow(domWinInternal, getter_AddRefs(startContentWin));
  NS_ENSURE_TRUE(startContentWin, NS_ERROR_FAILURE);

  nsCOMPtr<nsISuiteTypeAheadFind> typeAhead = 
    do_GetService(NS_TYPEAHEADFIND_CONTRACTID);
  NS_ENSURE_TRUE(typeAhead, NS_ERROR_FAILURE);

  return typeAhead->StartNewFind(startContentWin, isLinkSearch);
}

/* void onEvent (in string eventName); */
NS_IMETHODIMP
nsTypeAheadController::OnEvent(const char *eventName)
{
  return NS_OK;
}

nsresult
nsTypeAheadController::EnsureContentWindow(nsIDOMWindowInternal *aFocusedWin, 
                                           nsIDOMWindow **aStartContentWin)
{
  NS_ENSURE_ARG_POINTER(aFocusedWin);
  NS_ENSURE_ARG_POINTER(aStartContentWin);

  *aStartContentWin = nsnull;
  nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(aFocusedWin));
  NS_ENSURE_TRUE(ifreq, NS_OK);

  nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(ifreq));
  nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(webNav));
  NS_ENSURE_TRUE(treeItem, NS_OK);
  PRInt32 treeItemType;
  treeItem->GetItemType(&treeItemType);

  nsCOMPtr<nsIDOMWindow> startContentWin;
  if (treeItemType == nsIDocShellTreeItem::typeContent) {
    startContentWin = do_QueryInterface(aFocusedWin);
  }
  else {
    // Use enumerator tet first content docshell
    nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(webNav));
    NS_ENSURE_TRUE(docShell, NS_OK);

    nsCOMPtr<nsISimpleEnumerator> docShellEnumerator;
    docShell->GetDocShellEnumerator(nsIDocShellTreeItem::typeContent,
                                    nsIDocShell::ENUMERATE_FORWARDS,
                                    getter_AddRefs(docShellEnumerator));
  
    PRBool hasMoreDocShells;
    if (NS_SUCCEEDED(docShellEnumerator->HasMoreElements(&hasMoreDocShells))
        && hasMoreDocShells) {

      // There is a content docshell child, let's use it (focus it and return it)
      nsCOMPtr<nsISupports> container;
      docShellEnumerator->GetNext(getter_AddRefs(container));
      nsCOMPtr<nsIInterfaceRequestor> ifreq(do_QueryInterface(container));

      if (ifreq) {
        startContentWin = do_GetInterface(ifreq);
        NS_ENSURE_TRUE(startContentWin, NS_ERROR_FAILURE);

        // Set new focus in root content of new window
        // This only happens if we weren't already in content
        // Using nsIContent to focus makes sure the 
        // previous window's focused content gets blurred properly
        nsCOMPtr<nsIDOMDocument> domDoc;
        startContentWin->GetDocument(getter_AddRefs(domDoc));
        nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
        NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);

        nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
        nsCOMPtr<nsPresContext> presContext;
        docShell->GetPresContext(getter_AddRefs(presContext));
        NS_ENSURE_TRUE(presContext, NS_ERROR_FAILURE);

        nsIContent *rootContent = doc->GetRootContent();
        NS_ENSURE_TRUE(rootContent, NS_ERROR_FAILURE);
        rootContent->SetFocus(presContext);
      }
    }
  }

  *aStartContentWin = startContentWin;
  NS_IF_ADDREF(*aStartContentWin);
  return NS_OK;
}

already_AddRefed<nsIPresShell>
nsTypeAheadFind::GetPresShell()
{
  if (!mFocusedWeakShell)
    return nsnull;

  nsIPresShell *shell = nsnull;
  CallQueryReferent(mFocusedWeakShell.get(), &shell);
  if (shell) {
    nsPresContext *pc = shell->GetPresContext();
    if (!pc || !nsCOMPtr<nsISupports>(pc->GetContainer())) {
      NS_RELEASE(shell);
    }
  }

  return shell;
}

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