gecko-dev/content/events/src/nsEventStateManager.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape 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
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 *
 * 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):
 *
 *
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 * 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"),
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#include "nsCOMPtr.h"
#include "nsEventStateManager.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIFrame.h"
#include "nsIWidget.h"
#include "nsIStyleContext.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsDOMEvent.h"
#include "nsHTMLAtoms.h"
#include "nsIDOMHTMLAnchorElement.h"
#include "nsIDOMHTMLInputElement.h"
#include "nsIDOMHTMLSelectElement.h"
#include "nsIDOMHTMLTextAreaElement.h"
#include "nsIDOMHTMLAreaElement.h"
#include "nsIDOMHTMLButtonElement.h"
#include "nsIDOMHTMLObjectElement.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsIDOMHTMLBodyElement.h"
#include "nsImageMapUtils.h"
#include "nsIHTMLDocument.h"
#include "nsINameSpaceManager.h"  // for kNameSpaceID_HTML
#include "nsIWebShell.h"
#include "nsIBaseWindow.h"
#include "nsIScrollableView.h"
#include "nsISelection.h"
#include "nsIFrameSelection.h"
#include "nsIDeviceContext.h"
#include "nsIScriptGlobalObject.h"
#include "nsIPrivateDOMEvent.h"
#include "nsIDOMWindowInternal.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMEventTarget.h"
#include "nsIEnumerator.h"
#include "nsFrameTraversal.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeNode.h"
#include "nsIWebNavigation.h"
#include "nsIContentViewer.h"

#include "nsIServiceManager.h"
#include "nsIPref.h"
#include "nsIScriptSecurityManager.h"

#include "nsIChromeEventHandler.h"
#include "nsIFocusController.h"

#include "nsXULAtoms.h"
#include "nsIDOMXULDocument.h"
#include "nsIObserverService.h"
#include "nsIDocShell.h"
#include "nsIMarkupDocumentViewer.h"
#include "nsIScrollableViewProvider.h"
#include "nsIDOMDocumentRange.h"
#include "nsIDOMDocumentEvent.h"
#include "nsIDOMMouseEvent.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMDocumentView.h"
#include "nsIDOMAbstractView.h"
#include "nsIDOMNSUIEvent.h"

#include "nsIDOMRange.h"
#include "nsICaret.h"
#include "nsILookAndFeel.h"
#include "nsWidgetsCID.h"
#include "nsIFormControl.h"

#include "nsIFrameTraversal.h"
#include "nsLayoutCID.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsUnicharUtils.h"

#if defined(DEBUG_rods) || defined(DEBUG_bryner)
//#define DEBUG_DOCSHELL_FOCUS
#endif

#ifdef DEBUG_DOCSHELL_FOCUS
static char* gDocTypeNames[] = {"eChrome", "eGenericContent", "eFrameSet", "eFrame", "eIFrame"};
#endif

static NS_DEFINE_CID(kFrameTraversalCID, NS_FRAMETRAVERSAL_CID);


//we will use key binding by default now. this wil lbreak viewer for now
#define NON_KEYBINDING 0

static NS_DEFINE_CID(kPrefCID, NS_PREF_CID);
static NS_DEFINE_CID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);

nsIContent * gLastFocusedContent = 0; // Strong reference
nsIDocument * gLastFocusedDocument = 0; // Strong reference
nsIPresContext* gLastFocusedPresContext = 0; // Weak reference

PRUint32 nsEventStateManager::mInstanceCount = 0;

enum {
 MOUSE_SCROLL_N_LINES,
 MOUSE_SCROLL_PAGE,
 MOUSE_SCROLL_HISTORY,
 MOUSE_SCROLL_TEXTSIZE
};

nsEventStateManager::nsEventStateManager()
  : mGestureDownPoint(0,0),
    m_haveShutdown(PR_FALSE)
{
  mLastMouseOverFrame = nsnull;
  mLastDragOverFrame = nsnull;
  mCurrentTarget = nsnull;
  mCurrentTargetContent = nsnull;
  mCurrentRelatedContent = nsnull;
  mLastLeftMouseDownContent = nsnull;
  mLastMiddleMouseDownContent = nsnull;
  mLastRightMouseDownContent = nsnull;

  mConsumeFocusEvents = PR_FALSE;
  mLockCursor = 0;

  // init d&d gesture state machine variables
  mIsTrackingDragGesture = PR_FALSE;
  mGestureDownFrame = nsnull;

  mLClickCount = 0;
  mMClickCount = 0;
  mRClickCount = 0;
  mActiveContent = nsnull;
  mHoverContent = nsnull;
  mDragOverContent = nsnull;
  mCurrentFocus = nsnull;
  mDocument = nsnull;
  mPresContext = nsnull;
  mCurrentTabIndex = 0;
  mLastWindowToHaveFocus = nsnull;
  mFirstBlurEvent = nsnull;
  mFirstFocusEvent = nsnull;
  mAccessKeys = nsnull;
  mBrowseWithCaret = PR_FALSE;
  hHover = PR_FALSE;
  mLeftClickOnly = PR_TRUE;

  NS_INIT_REFCNT();

#ifdef CLICK_HOLD_CONTEXT_MENUS
  mEventDownWidget = nsnull;
#endif
  
  ++mInstanceCount;
}

NS_IMETHODIMP
nsEventStateManager::Init()
{
  nsresult rv;
  nsCOMPtr<nsIObserverService> observerService = 
           do_GetService("@mozilla.org/observer-service;1", &rv);
  if (NS_SUCCEEDED(rv))
  {
    observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, PR_TRUE);
  }

  rv = getPrefService();

  if (NS_SUCCEEDED(rv)) {
    mPrefService->GetBoolPref("nglayout.events.showHierarchicalHover", &hHover);
    mPrefService->GetBoolPref("nglayout.events.dispatchLeftClickOnly", &mLeftClickOnly);
  }

  return rv;
}

nsEventStateManager::~nsEventStateManager()
{
#if CLICK_HOLD_CONTEXT_MENUS
  if ( mClickHoldTimer ) {
    mClickHoldTimer->Cancel();
    mClickHoldTimer = nsnull;
  }
#endif

  NS_IF_RELEASE(mCurrentTargetContent);
  NS_IF_RELEASE(mCurrentRelatedContent);

  NS_IF_RELEASE(mLastLeftMouseDownContent);
  NS_IF_RELEASE(mLastMiddleMouseDownContent);
  NS_IF_RELEASE(mLastRightMouseDownContent);

  NS_IF_RELEASE(mActiveContent);
  NS_IF_RELEASE(mHoverContent);
  NS_IF_RELEASE(mDragOverContent);
  NS_IF_RELEASE(mCurrentFocus);

  NS_IF_RELEASE(mDocument);

  NS_IF_RELEASE(mLastWindowToHaveFocus);
  NS_IF_RELEASE(mFirstBlurEvent);
  NS_IF_RELEASE(mFirstFocusEvent);
  
  --mInstanceCount;
  if(mInstanceCount == 0) {
    NS_IF_RELEASE(gLastFocusedContent);
    NS_IF_RELEASE(gLastFocusedDocument);
  }

  if (mAccessKeys) {
    delete mAccessKeys;
  }

  if (!m_haveShutdown) {
    Shutdown();

    // Don't remove from Observer service in Shutdown because Shutdown also
    // gets called from xpcom shutdown observer.  And we don't want to remove
    // from the service in that case.

    nsresult rv;

    nsCOMPtr<nsIObserverService> observerService = 
             do_GetService("@mozilla.org/observer-service;1", &rv);
    if (NS_SUCCEEDED(rv))
      {
        observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
      }
  }
  
}

nsresult
nsEventStateManager::Shutdown()
{
  if (mPrefService) {
    mPrefService = nsnull;
  }

  m_haveShutdown = PR_TRUE;
  return NS_OK;
}

nsresult
nsEventStateManager::getPrefService()
{
  nsresult rv = NS_OK;

  if (!mPrefService) {
    mPrefService = do_GetService(kPrefCID, &rv);
  }

  if (NS_FAILED(rv)) return rv;

  if (!mPrefService) return NS_ERROR_FAILURE;

  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::Observe(nsISupports *aSubject, 
                             const char *aTopic,
                             const PRUnichar *someData)
{
  if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID))
    Shutdown();

  return NS_OK;
}


NS_IMPL_ISUPPORTS3(nsEventStateManager, nsIEventStateManager, nsIObserver, nsISupportsWeakReference)

NS_IMETHODIMP
nsEventStateManager::PreHandleEvent(nsIPresContext* aPresContext, 
                                 nsEvent *aEvent,
                                 nsIFrame* aTargetFrame,
                                 nsEventStatus* aStatus,
                                 nsIView* aView)
{
  NS_ENSURE_ARG_POINTER(aStatus);
  NS_ENSURE_ARG(aPresContext);

  mCurrentTarget = aTargetFrame;
  NS_IF_RELEASE(mCurrentTargetContent);

  nsFrameState state;

  NS_ASSERTION(mCurrentTarget, "mCurrentTarget is null.  this should not happen.  see bug #13007");
  if (!mCurrentTarget) return NS_ERROR_NULL_POINTER;

  mCurrentTarget->GetFrameState(&state);
  state |= NS_FRAME_EXTERNAL_REFERENCE;
  mCurrentTarget->SetFrameState(state);

  *aStatus = nsEventStatus_eIgnore;

  
  NS_ASSERTION(aEvent, "aEvent is null.  this should never happen");
  if (!aEvent) return NS_ERROR_NULL_POINTER;

  switch (aEvent->message) {
  case NS_MOUSE_LEFT_BUTTON_DOWN:
    BeginTrackingDragGesture ( aPresContext, (nsGUIEvent*)aEvent, aTargetFrame );
    mLClickCount = ((nsMouseEvent*)aEvent)->clickCount;
    SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
    break;
  case NS_MOUSE_MIDDLE_BUTTON_DOWN:
    mMClickCount = ((nsMouseEvent*)aEvent)->clickCount;
    SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
    break;
  case NS_MOUSE_RIGHT_BUTTON_DOWN:
    mRClickCount = ((nsMouseEvent*)aEvent)->clickCount;
    SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
    break;
  case NS_MOUSE_LEFT_BUTTON_UP:
#ifdef CLICK_HOLD_CONTEXT_MENUS
    KillClickHoldTimer();
#endif
    StopTrackingDragGesture();
  case NS_MOUSE_MIDDLE_BUTTON_UP:
  case NS_MOUSE_RIGHT_BUTTON_UP:
    SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
    break;
  case NS_MOUSE_MOVE:
    // on the Mac, GenerateDragGesture() may not return until the drag has completed
    // and so |aTargetFrame| may have been deleted (moving a bookmark, for example).
    // If this is the case, however, we know that ClearFrameRefs() has been called
    // and it cleared out |mCurrentTarget|. As a result, we should pass |mCurrentTarget|
    // into UpdateCursor().
    GenerateDragGesture(aPresContext, (nsGUIEvent*)aEvent);
    UpdateCursor(aPresContext, aEvent, mCurrentTarget, aStatus);
    GenerateMouseEnterExit(aPresContext, (nsGUIEvent*)aEvent);
    // Flush reflows and invalidates to eliminate flicker when both a reflow
    // and visual change occur in an event callback. See bug  #36849
    FlushPendingEvents(aPresContext); 
    break;
  case NS_MOUSE_EXIT:
    GenerateMouseEnterExit(aPresContext, (nsGUIEvent*)aEvent);
    //This is a window level mouseenter event and should stop here
    aEvent->message = 0;
    break;
#ifdef CLICK_HOLD_CONTEXT_MENUS
  case NS_DRAGDROP_GESTURE:
    // an external drag gesture event came in, not generated internally
    // by Gecko. Make sure we get rid of the click-hold timer.
    KillClickHoldTimer();
    break;
#endif
  case NS_DRAGDROP_OVER:
    GenerateDragDropEnterExit(aPresContext, (nsGUIEvent*)aEvent);
    break;
  case NS_GOTFOCUS:
    {
#ifdef DEBUG_hyatt
      printf("Got focus.\n");
#endif

      EnsureDocument(aPresContext);

      if (gLastFocusedDocument == mDocument)
        break;

      //fire focus
      nsEventStatus status = nsEventStatus_eIgnore;
      nsEvent focusevent;
      focusevent.eventStructType = NS_EVENT;
      focusevent.message = NS_FOCUS_CONTENT;

      if (mDocument) {
      
        if(gLastFocusedDocument) {
          // fire a blur, on the document only to keep ender happy
          nsEventStatus blurstatus = nsEventStatus_eIgnore;
          nsEvent blurevent;
          blurevent.eventStructType = NS_EVENT;
          blurevent.message = NS_BLUR_CONTENT;
      
          if(gLastFocusedPresContext) {
            nsCOMPtr<nsIFocusController> focusController;

            nsCOMPtr<nsIScriptGlobalObject> ourGlobal;
            gLastFocusedDocument->GetScriptGlobalObject(getter_AddRefs(ourGlobal));
            nsCOMPtr<nsIDOMWindowInternal> rootWindow;
            nsCOMPtr<nsPIDOMWindow> ourWindow = do_QueryInterface(ourGlobal);
            if(ourWindow) {
              ourWindow->GetRootFocusController(getter_AddRefs(focusController));
              if (focusController)
                focusController->SetSuppressFocus(PR_TRUE, "NS_GOTFOCUS ESM Suppression");
            }
            
            gLastFocusedDocument->HandleDOMEvent(gLastFocusedPresContext, &blurevent, nsnull, NS_EVENT_FLAG_INIT, &blurstatus);
            if (!mCurrentFocus && gLastFocusedContent) {
              // must send it to the element that is losing focus,
              // since SendFocusBlur wont be called
              gLastFocusedContent->HandleDOMEvent(gLastFocusedPresContext, &blurevent, nsnull, NS_EVENT_FLAG_INIT, &blurstatus);

              nsCOMPtr<nsIDocument> doc;
              gLastFocusedContent->GetDocument(*getter_AddRefs(doc));
              if (doc) {
                nsCOMPtr<nsIPresShell> shell;
                doc->GetShellAt(0, getter_AddRefs(shell));
                if (shell) {
                  nsCOMPtr<nsIPresContext> oldPresContext;
                  shell->GetPresContext(getter_AddRefs(oldPresContext));

                  nsEventStatus status = nsEventStatus_eIgnore;
                  nsEvent event;
                  event.eventStructType = NS_EVENT;
                  event.message = NS_BLUR_CONTENT;
                  nsCOMPtr<nsIEventStateManager> esm;
                  oldPresContext->GetEventStateManager(getter_AddRefs(esm));
                  esm->SetFocusedContent(gLastFocusedContent);
                  gLastFocusedContent->HandleDOMEvent(oldPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 
                  esm->SetFocusedContent(nsnull);
                  NS_IF_RELEASE(gLastFocusedContent);
                }
              }
            }
            if (focusController) {
              focusController->SetSuppressFocus(PR_FALSE, "NS_GOTFOCUS ESM Suppression");
            }
          }
        }
        
        // fire focus on window, not document
        nsCOMPtr<nsIScriptGlobalObject> globalObject;
        mDocument->GetScriptGlobalObject(getter_AddRefs(globalObject));
        if (globalObject) {
          nsIContent* currentFocus = mCurrentFocus;
          mCurrentFocus = nsnull; // keep the owning reference in currentFocus
          if(gLastFocusedDocument != mDocument) {
            mDocument->HandleDOMEvent(aPresContext, &focusevent, nsnull, NS_EVENT_FLAG_INIT, &status);
            if (currentFocus && currentFocus != gLastFocusedContent)
              currentFocus->HandleDOMEvent(aPresContext, &focusevent, nsnull, NS_EVENT_FLAG_INIT, &status);
          }
          
          globalObject->HandleDOMEvent(aPresContext, &focusevent, nsnull, NS_EVENT_FLAG_INIT, &status);
          NS_IF_RELEASE(mCurrentFocus);
          mCurrentFocus = currentFocus; // we kept this reference above
          NS_IF_RELEASE(gLastFocusedContent);
          gLastFocusedContent = mCurrentFocus;
          NS_IF_ADDREF(gLastFocusedContent);
        }

        
        NS_IF_RELEASE(gLastFocusedDocument);
        gLastFocusedDocument = mDocument;
        gLastFocusedPresContext = aPresContext;
        NS_IF_ADDREF(gLastFocusedDocument);
      }
    }

    // Set mBrowseWithCaret to value of preference if we're in HTML (don't use caret in XUL)
    if (mDocument) {
      mBrowseWithCaret = PR_FALSE;
      nsCOMPtr<nsIHTMLDocument> htmlDoc(do_QueryInterface(mDocument));
      if (htmlDoc)
        mPrefService->GetBoolPref("accessibility.browsewithcaret", &mBrowseWithCaret);
    }

    break;

  case NS_LOSTFOCUS:
    {
      // Hold the blur, wait for the focus so we can query the style of the focus
      // target as to what to do with the event. If appropriate we fire the blur
      // at that time.
#ifdef XP_WIN
      if(! NS_STATIC_CAST(nsFocusEvent*, aEvent)->isMozWindowTakingFocus) {
        EnsureDocument(aPresContext);

        // We can get a deactivate on an Ender widget.  In this
        // case, we would like to obtain the DOM Window to start
        // with by looking at gLastFocusedContent.
        nsCOMPtr<nsIScriptGlobalObject> ourGlobal;
        if (gLastFocusedContent) {
          nsCOMPtr<nsIDocument> doc;
          gLastFocusedContent->GetDocument(*getter_AddRefs(doc));
		      if(doc)
            doc->GetScriptGlobalObject(getter_AddRefs(ourGlobal));
          else {
		        mDocument->GetScriptGlobalObject(getter_AddRefs(ourGlobal));
		        NS_RELEASE(gLastFocusedContent);
          }
        }
        else mDocument->GetScriptGlobalObject(getter_AddRefs(ourGlobal));

        // Now fire blurs.  We have to fire a blur on the focused window
        // and on the focused element if there is one.
        if (gLastFocusedDocument && gLastFocusedPresContext) {
          // Blur the element.
          if (gLastFocusedContent) {
            // Retrieve this content node's pres context. it can be out of sync in
            // the Ender widget case.
            nsCOMPtr<nsIDocument> doc;
            gLastFocusedContent->GetDocument(*getter_AddRefs(doc));
            if (doc) {
              nsCOMPtr<nsIPresShell> shell;
              doc->GetShellAt(0, getter_AddRefs(shell));
              if (shell) {
                nsCOMPtr<nsIPresContext> oldPresContext;
                shell->GetPresContext(getter_AddRefs(oldPresContext));

                nsEventStatus status = nsEventStatus_eIgnore;
                nsEvent event;
                event.eventStructType = NS_EVENT;
                event.message = NS_BLUR_CONTENT;
                nsCOMPtr<nsIEventStateManager> esm;
                oldPresContext->GetEventStateManager(getter_AddRefs(esm));
                esm->SetFocusedContent(gLastFocusedContent);
                gLastFocusedContent->HandleDOMEvent(oldPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 
                esm->SetFocusedContent(nsnull);
                NS_IF_RELEASE(gLastFocusedContent);
              }
            }
          }

          nsEventStatus status = nsEventStatus_eIgnore;
          nsEvent event;
          event.eventStructType = NS_EVENT;
          event.message = NS_BLUR_CONTENT;
    
          // fire blur on document and window
          nsCOMPtr<nsIScriptGlobalObject> globalObject;
          if(gLastFocusedDocument) {
            gLastFocusedDocument->GetScriptGlobalObject(getter_AddRefs(globalObject));
            gLastFocusedDocument->HandleDOMEvent(gLastFocusedPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
            if(globalObject)
              globalObject->HandleDOMEvent(gLastFocusedPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
          }
          // Now clear our our global variables
          mCurrentTarget = nsnull;
          NS_IF_RELEASE(gLastFocusedDocument);
          gLastFocusedPresContext = nsnull;
        }             
      } 
#endif
    }
    break;

 case NS_ACTIVATE:
    {
      // If we have a command dispatcher, and if it has a focused window and a
      // focused element in its focus memory, then restore the focus to those
      // objects.
      EnsureDocument(aPresContext);
#ifdef DEBUG_hyatt
      printf("ESM: GOT ACTIVATE.\n");
#endif
      nsCOMPtr<nsIFocusController> focusController;
      nsCOMPtr<nsIDOMElement> focusedElement;
      nsCOMPtr<nsIDOMWindowInternal> focusedWindow;
      nsCOMPtr<nsIDOMXULDocument> xulDoc = do_QueryInterface(mDocument);

      nsCOMPtr<nsIScriptGlobalObject> globalObj;
      mDocument->GetScriptGlobalObject(getter_AddRefs(globalObj));
      nsCOMPtr<nsPIDOMWindow> win(do_QueryInterface(globalObj));
      NS_ASSERTION(win, "win is null.  this happens [often on xlib builds].  see bug #79213");
      if (!win) return NS_ERROR_NULL_POINTER;
      win->GetRootFocusController(getter_AddRefs(focusController));

      if (focusController) {
        // Obtain focus info from the command dispatcher.
        focusController->GetFocusedWindow(getter_AddRefs(focusedWindow));
        focusController->GetFocusedElement(getter_AddRefs(focusedElement));

        focusController->SetSuppressFocusScroll(PR_TRUE);
        focusController->SetActive(PR_TRUE);
      }

	    if (!focusedWindow) {
        nsCOMPtr<nsIScriptGlobalObject> globalObject;
        mDocument->GetScriptGlobalObject(getter_AddRefs(globalObject));
        focusedWindow = do_QueryInterface(globalObject);
      }

      // Focus the DOM window.
      NS_WARN_IF_FALSE(focusedWindow,"check why focusedWindow is null!!!");
      if(focusedWindow) {
        focusedWindow->Focus();

        if (focusedElement) {
          nsCOMPtr<nsIContent> focusContent = do_QueryInterface(focusedElement);
          nsCOMPtr<nsIDOMDocument> domDoc;
          nsCOMPtr<nsIDocument> document;
          focusedWindow->GetDocument(getter_AddRefs(domDoc));
          if (domDoc) {
            document = do_QueryInterface(domDoc);
            nsCOMPtr<nsIPresShell> shell;
            nsCOMPtr<nsIPresContext> context;
            document->GetShellAt(0, getter_AddRefs(shell));
            NS_ASSERTION(shell, "Focus events should not be getting thru when this is null!");
            if (shell) {
              shell->GetPresContext(getter_AddRefs(context));
              focusContent->SetFocus(context);
            }
          }
        }  
      }

      if (focusController) {
        PRBool isSuppressed;
        focusController->GetSuppressFocus(&isSuppressed);
        while(isSuppressed){
          focusController->SetSuppressFocus(PR_FALSE, "Activation Suppression"); // Unsuppress and let the command dispatcher listen again.
          focusController->GetSuppressFocus(&isSuppressed);
        }
        focusController->SetSuppressFocusScroll(PR_FALSE);
      }  
    }
  break;
    
 case NS_DEACTIVATE:
    {
      EnsureDocument(aPresContext);

      nsCOMPtr<nsIScriptGlobalObject> ourGlobal;
      mDocument->GetScriptGlobalObject(getter_AddRefs(ourGlobal));

      // Suppress the command dispatcher for the duration of the
      // de-activation.  This will cause it to remember the last
      // focused sub-window and sub-element for this top-level
      // window.
      nsCOMPtr<nsIFocusController> focusController;
      mDocument->GetFocusController(getter_AddRefs(focusController));
        if (focusController) {
          // Suppress the command dispatcher.
          focusController->SetSuppressFocus(PR_TRUE, "Deactivate Suppression");
        }

      // Now fire blurs.  We have to fire a blur on the focused window
      // and on the focused element if there is one.
      if (gLastFocusedDocument && gLastFocusedDocument == mDocument) {
        if (gLastFocusedContent) {
          // Blur the element.
          nsCOMPtr<nsIPresShell> shell;
          
          nsCOMPtr<nsIDOMElement> focusedElement;
          focusController->GetFocusedElement(getter_AddRefs(focusedElement));
          nsCOMPtr<nsIContent> focusedContent = do_QueryInterface(focusedElement);
          
          gLastFocusedDocument->GetShellAt(0, getter_AddRefs(shell));
          if (shell) {
            nsCOMPtr<nsIPresContext> oldPresContext;
            shell->GetPresContext(getter_AddRefs(oldPresContext));
            
            nsEventStatus status = nsEventStatus_eIgnore;
            nsEvent event;
            event.eventStructType = NS_EVENT;
            event.message = NS_BLUR_CONTENT;
            nsCOMPtr<nsIEventStateManager> esm;
            oldPresContext->GetEventStateManager(getter_AddRefs(esm));
            esm->SetFocusedContent(gLastFocusedContent);
            if(focusedContent)
              focusedContent->HandleDOMEvent(oldPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 
            esm->SetFocusedContent(nsnull);
            NS_IF_RELEASE(gLastFocusedContent);
          }
        }

        nsEventStatus status = nsEventStatus_eIgnore;
        nsEvent event;
        event.eventStructType = NS_EVENT;
        event.message = NS_BLUR_CONTENT;
    
        // fire blur on document and window
        mDocument->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
        if (ourGlobal)
          ourGlobal->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
        else {
          // If the document is being torn down, we can't fire a blur on
          // the window, but we still need to tell the focus controller
          // that it isn't active.
          
          nsCOMPtr<nsIFocusController> fc;
          gLastFocusedDocument->GetFocusController(getter_AddRefs(fc));
          if (fc)
            fc->SetActive(PR_FALSE);
        }

        // Now clear our our global variables
        mCurrentTarget = nsnull;
        NS_IF_RELEASE(gLastFocusedDocument);
        gLastFocusedPresContext = nsnull;
      }             

      if (focusController) {
        focusController->SetActive(PR_FALSE);
        focusController->SetSuppressFocus(PR_FALSE, "Deactivate Suppression");
      }
    } 
    
    break;
    
  case NS_KEY_PRESS:
    {

      nsKeyEvent* keyEvent = (nsKeyEvent*)aEvent;
#if defined(XP_MAC) || defined(XP_MACOSX)
    // (pinkerton, joki, saari) IE5 for mac uses Control for access keys. The HTML4 spec
    // suggests to use command on mac, but this really sucks (imagine someone having a "q"
    // as an access key and not letting you quit the app!). As a result, we've made a 
    // command decision 1 day before tree lockdown to change it to the control key.
    PRBool isSpecialAccessKeyDown = keyEvent->isControl;
#else
    PRBool isSpecialAccessKeyDown = keyEvent->isAlt;
#endif
      //This is to prevent keyboard scrolling while alt modifier in use.
      if (isSpecialAccessKeyDown) {
        //Alt key is down, we may need to do an accesskey
        if (mAccessKeys) {
          //Someone registered an accesskey.  Find and activate it.
          nsAutoString accKey((char)keyEvent->charCode);
          ToLowerCase(accKey);

          nsVoidKey key((void*)accKey.First());
          if (mAccessKeys->Exists(&key)) {
            nsCOMPtr<nsIContent> content = getter_AddRefs(NS_STATIC_CAST(nsIContent*, mAccessKeys->Get(&key)));

            //Its hard to say what HTML4 wants us to do in all cases.  So for now we'll settle for
            //A) Set focus
            ChangeFocus(content);

            nsresult rv = getPrefService();
            PRBool activate = PR_TRUE;

            if (NS_SUCCEEDED(rv)) {
              mPrefService->GetBoolPref("accessibility.accesskeycausesactivation", &activate);
            }

            if (activate) {
              //B) Click on it if the users prefs indicate to do so.
              nsEventStatus status = nsEventStatus_eIgnore;
              nsMouseEvent event;
              event.eventStructType = NS_MOUSE_EVENT;
              event.message = NS_MOUSE_LEFT_CLICK;
              event.isShift = PR_FALSE;
              event.isControl = PR_FALSE;
              event.isAlt = PR_FALSE;
              event.isMeta = PR_FALSE;
              event.clickCount = 0;
              event.widget = nsnull;
              content->HandleDOMEvent(mPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
            }

            *aStatus = nsEventStatus_eConsumeNoDefault;
          }
        }
      }
    }
  case NS_KEY_DOWN:
  case NS_KEY_UP:
  case NS_MOUSE_SCROLL:
    {
      if (mCurrentFocus) {
        mCurrentTargetContent = mCurrentFocus;
        NS_ADDREF(mCurrentTargetContent);
      }
    }
    break;
  }
  return NS_OK;
}


#ifdef CLICK_HOLD_CONTEXT_MENUS


//
// CreateClickHoldTimer
//
// Fire off a timer for determining if the user wants click-hold. This timer
// is a one-shot that will be cancelled when the user moves enough to fire
// a drag.
//
void
nsEventStateManager :: CreateClickHoldTimer ( nsIPresContext* inPresContext, nsGUIEvent* inMouseDownEvent )
{
  // just to be anal (er, safe)
  if ( mClickHoldTimer ) {
    mClickHoldTimer->Cancel();
    mClickHoldTimer = nsnull;
  }
  
  // if content clicked on has a popup, don't even start the timer
  // since we'll end up conflicting and both will show.
  nsCOMPtr<nsIContent> clickedContent;
  if ( mGestureDownFrame ) {
    mGestureDownFrame->GetContent(getter_AddRefs(clickedContent));
    if ( clickedContent ) {
      // check for the |popup| attribute
      nsAutoString popup;
      clickedContent->GetAttr(kNameSpaceID_None, nsXULAtoms::popup, popup);
      if ( popup != NS_LITERAL_STRING("") )
        return;
      
      // check for a <menubutton> like bookmarks
      nsCOMPtr<nsIAtom> tag;
      clickedContent->GetTag ( *getter_AddRefs(tag) );
      if ( tag == nsXULAtoms::menubutton )
        return;
    }
  }

  mClickHoldTimer = do_CreateInstance("@mozilla.org/timer;1");
  if ( mClickHoldTimer )
    mClickHoldTimer->Init(sClickHoldCallback, this, kClickHoldDelay, NS_PRIORITY_HIGH);

  mEventPoint = inMouseDownEvent->point;
  mEventRefPoint = inMouseDownEvent->refPoint;
  mEventDownWidget = inMouseDownEvent->widget;
  
  mEventPresContext = inPresContext;
  
} // CreateClickHoldTimer


//
// KillClickHoldTimer
//
// Stop the timer that would show the context menu dead in its tracks
//
void
nsEventStateManager :: KillClickHoldTimer ( )
{
  if ( mClickHoldTimer ) {
    mClickHoldTimer->Cancel();
    mClickHoldTimer = nsnull;
  }

  mEventDownWidget = nsnull;
  mEventPresContext = nsnull;

} // KillTooltipTimer


//
// sClickHoldCallback
//
// This fires after the mouse has been down for a certain length of time. 
//
void
nsEventStateManager :: sClickHoldCallback ( nsITimer *aTimer, void* aESM )
{
  nsEventStateManager* self = NS_STATIC_CAST(nsEventStateManager*, aESM);
  if ( self )
    self->FireContextClick();

  // NOTE: |aTimer| and |self->mAutoHideTimer| are invalid after calling ClosePopup();
  
} // sAutoHideCallback


//
// FireContextClick
//
// If we're this far, our timer has fired, which means the mouse has been down
// for a certain period of time and has not moved enough to generate a dragGesture.
// We can be certain the user wants a context-click at this stage, so generate
// a dom event and fire it in.
//
// After the event fires, check if PreventDefault() has been set on the event which
// means that someone either ate the event or put up a context menu. This is our cue
// to stop tracking the drag gesture. If we always did this, draggable items w/out
// a context menu wouldn't be draggable after a certain length of time, which is
// _not_ what we want.
//
void
nsEventStateManager :: FireContextClick ( )
{
  if ( !mEventDownWidget || !mEventPresContext )
    return;

  nsEventStatus status = nsEventStatus_eIgnore;
  nsMouseEvent event;
  event.eventStructType = NS_MOUSE_EVENT;
  event.message = NS_CONTEXTMENU;
  event.widget = mEventDownWidget;
  event.clickCount = 1;
  event.point = mEventPoint;
  event.refPoint = mEventRefPoint;
  event.isShift = PR_FALSE;
  event.isControl = PR_FALSE;
  event.isAlt = PR_FALSE;
  event.isMeta = PR_FALSE;

  // Dispatch to the DOM. We have to fake out the ESM and tell it that the
  // current target frame is actually where the mouseDown occurred, otherwise it
  // will use the frame the mouse is currently over which may or may not be
  // the same. (Note: saari and I have decided that we don't have to reset |mCurrentTarget|
  // when we're through because no one else is doing anything more with this
  // event and it will get reset on the very next event to the correct frame).
  mCurrentTarget = mGestureDownFrame;
  nsCOMPtr<nsIContent> lastContent;
  if ( mGestureDownFrame ) {
    mGestureDownFrame->GetContent(getter_AddRefs(lastContent));
    
    if ( lastContent ) {
      // before dispatching, check that we're not on something that doesn't get a context menu
      PRBool allowedToDispatch = PR_TRUE;

      nsCOMPtr<nsIAtom> tag;
      lastContent->GetTag ( *getter_AddRefs(tag) );
      nsCOMPtr<nsIDOMHTMLInputElement> inputElm ( do_QueryInterface(lastContent) );
      nsCOMPtr<nsIFormControl> formControl ( do_QueryInterface(lastContent) );
      if ( inputElm ) {
        // of all input elements, only ones dealing with text are allowed to have context menus
        if ( tag == nsHTMLAtoms::input ) {
          nsAutoString type;
          lastContent->GetAttr(kNameSpaceID_None, nsHTMLAtoms::type, type);
          if ( type != NS_LITERAL_STRING("") && type != NS_LITERAL_STRING("text") &&
                type != NS_LITERAL_STRING("password") && type != NS_LITERAL_STRING("file") )
            allowedToDispatch = PR_FALSE;
        }
      }
      else if ( formControl )           // catches combo-boxes
        allowedToDispatch = PR_FALSE;
      else if ( tag == nsXULAtoms::scrollbar || tag == nsXULAtoms::scrollbarbutton || tag == nsXULAtoms::button )
        allowedToDispatch = PR_FALSE;
      else if ( tag == nsHTMLAtoms::applet || tag == nsHTMLAtoms::object || tag == nsHTMLAtoms::embed )
        allowedToDispatch = PR_FALSE;
    
      if ( allowedToDispatch ) {
        // stop selection tracking, we're in control now
        nsCOMPtr<nsIFrameSelection> frameSel;
        GetSelection ( mGestureDownFrame, mEventPresContext, getter_AddRefs(frameSel) );
        if ( frameSel ) {
          PRBool mouseDownState = PR_TRUE;
          frameSel->GetMouseDownState(&mouseDownState);
          if (mouseDownState)
            frameSel->SetMouseDownState(PR_FALSE);
        }
        
        // dispatch to DOM
        lastContent->HandleDOMEvent(mEventPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
        
        // dispatch to the frame
        mGestureDownFrame->HandleEvent(mEventPresContext, &event, &status);   
      }
    }
  }
  
  // now check if the event has been handled. If so, stop tracking a drag
  if ( status == nsEventStatus_eConsumeNoDefault )
    StopTrackingDragGesture();

  KillClickHoldTimer();
  
} // FireContextClick

#endif


// 
// BeginTrackingDragGesture
//
// Record that the mouse has gone down and that we should move to TRACKING state
// of d&d gesture tracker.
//
// We also use this to track click-hold context menus on mac. When the mouse goes down,
// fire off a short timer. If the timer goes off and we have yet to fire the
// drag gesture (ie, the mouse hasn't moved a certain distance), then we can
// assume the user wants a click-hold, so fire a context-click event. We only
// want to cancel the drag gesture if the context-click event is handled.
//
void
nsEventStateManager :: BeginTrackingDragGesture ( nsIPresContext* aPresContext, nsGUIEvent* inDownEvent, nsIFrame* inDownFrame )
{
  mIsTrackingDragGesture = PR_TRUE;
  mGestureDownPoint = inDownEvent->point;
  mGestureDownFrame = inDownFrame;
  
#ifdef CLICK_HOLD_CONTEXT_MENUS
  // fire off a timer to track click-hold
  CreateClickHoldTimer ( aPresContext, inDownEvent );
#endif

}


//
// StopTrackingDragGesture
//
// Record that the mouse has gone back up so that we should leave the TRACKING 
// state of d&d gesture tracker and return to the START state.
//
void
nsEventStateManager :: StopTrackingDragGesture ( )
{
  mIsTrackingDragGesture = PR_FALSE;
  mGestureDownPoint = nsPoint(0,0);
  mGestureDownFrame = nsnull;
}


//
// GetSelection
//
// Helper routine to get an nsIFrameSelection from the given frame
//
void
nsEventStateManager :: GetSelection ( nsIFrame* inFrame, nsIPresContext* inPresContext, nsIFrameSelection** outSelection )
{
  *outSelection = nsnull;
  
  if (inFrame) {
    nsCOMPtr<nsISelectionController> selCon;
    nsresult rv = inFrame->GetSelectionController(inPresContext, getter_AddRefs(selCon));

    if (NS_SUCCEEDED(rv) && selCon) {
      nsCOMPtr<nsIFrameSelection> frameSel;

      frameSel = do_QueryInterface(selCon);

      if (! frameSel) {
        nsCOMPtr<nsIPresShell> shell;
        rv = inPresContext->GetShell(getter_AddRefs(shell));

        if (NS_SUCCEEDED(rv) && shell)
          rv = shell->GetFrameSelection(getter_AddRefs(frameSel));
      }
      
      *outSelection = frameSel.get();
      NS_IF_ADDREF(*outSelection);
    }
  }

} // GetSelection


//
// GenerateDragGesture
//
// If we're in the TRACKING state of the d&d gesture tracker, check the current position
// of the mouse in relation to the old one. If we've moved a sufficient amount from
// the mouse down, then fire off a drag gesture event.
//
// Note that when the mouse enters a new child window with its own view, the event's
// coordinates will be in relation to the origin of the inner child window, which could
// either be very different from that of the mouse coords of the mouse down and trigger
// a drag too early, or very similiar which might not trigger a drag. 
//
// Do we need to do anything about this? Let's wait and see.
//
void
nsEventStateManager :: GenerateDragGesture ( nsIPresContext* aPresContext, nsGUIEvent *aEvent )
{
  NS_WARN_IF_FALSE(aPresContext, "This shouldn't happen.");
  if ( IsTrackingDragGesture() ) {

    // Check if selection is tracking drag gestures, if so
    // don't interfere!
    nsCOMPtr<nsIFrameSelection> frameSel;
    GetSelection ( mGestureDownFrame, aPresContext, getter_AddRefs(frameSel) );
    if ( frameSel ) {
      PRBool mouseDownState = PR_TRUE;
      frameSel->GetMouseDownState(&mouseDownState);
      if (mouseDownState) {
        StopTrackingDragGesture();
        return;
      }
    }

    // figure out the delta in twips, since that is how it is in the event.
    // Do we need to do this conversion every time? Will the pres context really change on
    // us or can we cache it?
    long twipDeltaToStartDrag = 0;
    const long pixelDeltaToStartDrag = 5;
    nsCOMPtr<nsIDeviceContext> devContext;
    aPresContext->GetDeviceContext ( getter_AddRefs(devContext) );
    if ( devContext ) {
      float pixelsToTwips = 0.0;
      devContext->GetDevUnitsToTwips(pixelsToTwips);
      twipDeltaToStartDrag =  (long)(pixelDeltaToStartDrag * pixelsToTwips);
    }
 
    // fire drag gesture if mouse has moved enough
    if ( abs(aEvent->point.x - mGestureDownPoint.x) > twipDeltaToStartDrag ||
          abs(aEvent->point.y - mGestureDownPoint.y) > twipDeltaToStartDrag ) {
#ifdef CLICK_HOLD_CONTEXT_MENUS
      // stop the click-hold before we fire off the drag gesture, in case
      // it takes a long time
      KillClickHoldTimer();
#endif

      nsEventStatus status = nsEventStatus_eIgnore;
      nsMouseEvent event;
      event.eventStructType = NS_DRAGDROP_EVENT;
      event.message = NS_DRAGDROP_GESTURE;
      event.widget = aEvent->widget;
      event.clickCount = 0;
      event.point = aEvent->point;
      event.refPoint = aEvent->refPoint;
      event.isShift = ((nsMouseEvent*)aEvent)->isShift;
      event.isControl = ((nsMouseEvent*)aEvent)->isControl;
      event.isAlt = ((nsMouseEvent*)aEvent)->isAlt;
      event.isMeta = ((nsMouseEvent*)aEvent)->isMeta;

      // Dispatch to the DOM. We have to fake out the ESM and tell it that the
      // current target frame is actually where the mouseDown occurred, otherwise it
      // will use the frame the mouse is currently over which may or may not be
      // the same. (Note: saari and I have decided that we don't have to reset |mCurrentTarget|
      // when we're through because no one else is doing anything more with this
      // event and it will get reset on the very next event to the correct frame).
      mCurrentTarget = mGestureDownFrame;
      nsCOMPtr<nsIContent> lastContent;
      if ( mGestureDownFrame ) {
        mGestureDownFrame->GetContentForEvent(aPresContext, aEvent, getter_AddRefs(lastContent));
        if ( lastContent )
          lastContent->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
      }
      
      // dispatch to the frame
      if ( mGestureDownFrame ) 
        mGestureDownFrame->HandleEvent(aPresContext, &event, &status);   
      
      StopTrackingDragGesture();
    }
  }

  // Now flush all pending notifications.
  FlushPendingEvents(aPresContext);
} // GenerateDragGesture

nsresult
nsEventStateManager::ChangeTextSize(PRInt32 change)
{
  if(!gLastFocusedDocument) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIScriptGlobalObject> ourGlobal;
  gLastFocusedDocument->GetScriptGlobalObject(getter_AddRefs(ourGlobal));
  if(!ourGlobal) return NS_ERROR_FAILURE;
  
  nsCOMPtr<nsPIDOMWindow> ourWindow = do_QueryInterface(ourGlobal);
  if(!ourWindow) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIDOMWindowInternal> rootWindow;
  ourWindow->GetPrivateRoot(getter_AddRefs(rootWindow));
  if(!rootWindow) return NS_ERROR_FAILURE;
  
  nsCOMPtr<nsIDOMWindow> windowContent;
  rootWindow->GetContent(getter_AddRefs(windowContent));
  if(!windowContent) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIDOMDocument> domDoc;
  windowContent->GetDocument(getter_AddRefs(domDoc));
  if(!domDoc) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
  if(!doc) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIPresShell> presShell;
  doc->GetShellAt(0, getter_AddRefs(presShell));
  if(!presShell) return NS_ERROR_FAILURE;
  nsCOMPtr<nsIPresContext> presContext;
  presShell->GetPresContext(getter_AddRefs(presContext));
  if(!presContext) return NS_ERROR_FAILURE;

  nsCOMPtr<nsISupports> pcContainer;
  presContext->GetContainer(getter_AddRefs(pcContainer));
  if(!pcContainer) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIDocShell> docshell(do_QueryInterface(pcContainer));
  if(!docshell) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIContentViewer> cv;
  docshell->GetContentViewer(getter_AddRefs(cv));
  if(!cv) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIMarkupDocumentViewer> mv(do_QueryInterface(cv));
  if(!mv) return NS_ERROR_FAILURE;

  float textzoom;
  mv->GetTextZoom(&textzoom);
  textzoom += ((float)change) / 10;
  if (textzoom > 0 && textzoom <= 20)
    mv->SetTextZoom(textzoom);

  return NS_OK;
}


//
nsresult
nsEventStateManager::DoWheelScroll(nsIPresContext* aPresContext,
                                   nsIFrame* aTargetFrame,
                                   nsMouseScrollEvent* msEvent,
                                   PRInt32 numLines, PRBool scrollPage,
                                   PRBool aUseTargetFrame)
{
  nsCOMPtr<nsIContent> targetContent;
  aTargetFrame->GetContent(getter_AddRefs(targetContent));
  if (!targetContent)
    GetFocusedContent(getter_AddRefs(targetContent));
  if (!targetContent) return NS_OK;
  nsCOMPtr<nsIDocument> targetDoc;
  targetContent->GetDocument(*getter_AddRefs(targetDoc));
  if (!targetDoc) return NS_OK;
  nsCOMPtr<nsIDOMDocumentEvent> targetDOMDoc(do_QueryInterface(targetDoc));

  nsCOMPtr<nsIDOMEvent> event;
  targetDOMDoc->CreateEvent(NS_LITERAL_STRING("MouseScrollEvents"), getter_AddRefs(event));
  if (event) {
    nsCOMPtr<nsIDOMMouseEvent> mouseEvent(do_QueryInterface(event));
    nsCOMPtr<nsIDOMDocumentView> docView = do_QueryInterface(targetDoc);
    if (!docView) return nsnull;
    nsCOMPtr<nsIDOMAbstractView> view;
    docView->GetDefaultView(getter_AddRefs(view));
    
    if (scrollPage)
      numLines = numLines > 0 ? nsIDOMNSUIEvent::SCROLL_PAGE_DOWN : nsIDOMNSUIEvent::SCROLL_PAGE_UP;
      
    mouseEvent->InitMouseEvent(NS_LITERAL_STRING("DOMMouseScroll"), PR_TRUE, PR_TRUE, 
                               view, numLines,
                               msEvent->refPoint.x, msEvent->refPoint.y,
                               msEvent->point.x, msEvent->point.y,
                               msEvent->isControl, msEvent->isAlt, msEvent->isShift, msEvent->isMeta,
                               0, nsnull);
    PRBool allowDefault;
    nsCOMPtr<nsIDOMEventTarget> target(do_QueryInterface(targetContent));
    if (target) {
      target->DispatchEvent(event, &allowDefault);
      if (!allowDefault)
        return NS_OK;
    }
  }

  targetDOMDoc->CreateEvent(NS_LITERAL_STRING("MouseScrollEvents"), getter_AddRefs(event));
  if (event) {
    nsCOMPtr<nsIDOMMouseEvent> mouseEvent(do_QueryInterface(event));
  }

  nsIView* focusView = nsnull;
  nsIScrollableView* sv = nsnull;
  nsIFrame* focusFrame = nsnull;
  
  // Create a mouseout event that we fire to the content before
  // scrolling, to allow tooltips to disappear, etc.

  nsMouseEvent mouseOutEvent;
  mouseOutEvent.eventStructType = NS_MOUSE_EVENT;
  mouseOutEvent.message = NS_MOUSE_EXIT_SYNTH;
  mouseOutEvent.widget = msEvent->widget;
  mouseOutEvent.clickCount = 0;
  mouseOutEvent.point = nsPoint(0,0);
  mouseOutEvent.refPoint = nsPoint(0,0);
  mouseOutEvent.isShift = PR_FALSE;
  mouseOutEvent.isControl = PR_FALSE;
  mouseOutEvent.isAlt = PR_FALSE;
  mouseOutEvent.isMeta = PR_FALSE;

  nsEventStatus mouseoutStatus = nsEventStatus_eIgnore;

  nsCOMPtr<nsIPresShell> presShell;
  aPresContext->GetShell(getter_AddRefs(presShell));

  // Otherwise, check for a focused content element
  nsCOMPtr<nsIContent> focusContent;
  if (mCurrentFocus) {
    focusContent = mCurrentFocus;
  }
  else {
    // If there is no focused content, get the document content
    EnsureDocument(presShell);
    mDocument->GetRootContent(getter_AddRefs(focusContent));
  }
  
  if (!focusContent)
    return NS_ERROR_FAILURE;

  if (aUseTargetFrame)
    focusFrame = aTargetFrame;
  else
    presShell->GetPrimaryFrameFor(focusContent, &focusFrame);

  if (!focusFrame)
    return NS_ERROR_FAILURE;

  // Now check whether this frame wants to provide us with an
  // nsIScrollableView to use for scrolling.

  nsCOMPtr<nsIScrollableViewProvider> svp = do_QueryInterface(focusFrame);
  if (svp) {
    svp->GetScrollableView(&sv);
    if (sv)
      sv->QueryInterface(NS_GET_IID(nsIView), (void**) &focusView);
  } else {
    focusFrame->GetView(aPresContext, &focusView);
    if (!focusView) {
      nsIFrame* frameWithView;
      focusFrame->GetParentWithView(aPresContext, &frameWithView);
      if (frameWithView)
        frameWithView->GetView(aPresContext, &focusView);
      else
        return NS_ERROR_FAILURE;
    }
    
    sv = GetNearestScrollingView(focusView);
  }

  PRBool passToParent = PR_FALSE;

  if (sv) {
    if (targetContent)
      targetContent->HandleDOMEvent(aPresContext, &mouseOutEvent, nsnull,
                                    NS_EVENT_FLAG_INIT, &mouseoutStatus);

    // Check the scroll position before and after calling ScrollBy[Page|Line]s.
    // This allows us to detect whether the view is not scrollable
    // (for whatever reason) and bubble up the scroll to the parent document.

    nscoord xPos, yPos;
    sv->GetScrollPosition(xPos, yPos);

    if (scrollPage)
      sv->ScrollByPages((numLines > 0) ? 1 : -1);
    else
      sv->ScrollByLines(0, numLines);

    nscoord newXPos, newYPos;
    sv->GetScrollPosition(newXPos, newYPos);

    if (newYPos != yPos) {
      if (focusView)
        ForceViewUpdate(focusView);
    } else
      passToParent = PR_TRUE;
  } else
    passToParent = PR_TRUE;

  if (passToParent) {
    nsresult rv;
    nsIFrame* newFrame = nsnull;
    nsCOMPtr<nsIPresContext> newPresContext;

    rv = GetParentScrollingView(msEvent, aPresContext, newFrame,
                                *getter_AddRefs(newPresContext));
    if (NS_SUCCEEDED(rv))
      return DoWheelScroll(newPresContext, newFrame, msEvent, numLines,
                           scrollPage, PR_TRUE);
    else
      return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

nsresult
nsEventStateManager::GetParentScrollingView(nsMouseScrollEvent *aEvent,
                                            nsIPresContext* aPresContext,
                                            nsIFrame* &targetOuterFrame,
                                            nsIPresContext* &presCtxOuter)
{
  if (!aEvent) return NS_ERROR_FAILURE;
  if (!aPresContext) return NS_ERROR_FAILURE;
  
  nsCOMPtr<nsISupports> shell;
  aPresContext->GetContainer(getter_AddRefs(shell));
  if (!shell) return NS_ERROR_FAILURE;
  
  nsCOMPtr<nsIDocShellTreeItem> treeItem = do_QueryInterface(shell);
  if (!treeItem) return NS_ERROR_FAILURE;

  /* get our docshell's parent */
  nsCOMPtr<nsIDocShellTreeItem> parent;
  treeItem->GetParent(getter_AddRefs(parent));
  if (!parent) return NS_ERROR_FAILURE;
  
  nsCOMPtr<nsIDocShell> pDocShell = do_QueryInterface(parent);
  if (!pDocShell) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIPresShell> pPresShell;
  pDocShell->GetPresShell(getter_AddRefs(pPresShell));
  if (!pPresShell) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIDocument> parentDoc;
  pPresShell->GetDocument(getter_AddRefs(parentDoc));

  nsCOMPtr<nsIContent> rootContent;
  parentDoc->GetRootContent(getter_AddRefs(rootContent));

  nsCOMPtr<nsIDocShell> ourDS = do_QueryInterface(shell);

  /* now find the content node in our parent docshell's document that corresponds
     to our docshell */
  nsCOMPtr<nsIContent> frameContent;
  pPresShell->FindContentForShell(ourDS, getter_AddRefs(frameContent));
  if (!frameContent) return NS_ERROR_FAILURE;

  /*
    get this content node's frame, and use it as the new event target,
    so the event can be processed in the parent docshell.
    Note that we don't actually need to translate the event coordinates
    because they are not used by DoWheelScroll().
  */
  nsIFrame* frameFrame = nsnull;
  pPresShell->GetPrimaryFrameFor(frameContent, &frameFrame);
  if (!frameFrame) return NS_ERROR_FAILURE;

  pPresShell->GetPresContext(&presCtxOuter); //addrefs
  targetOuterFrame = frameFrame;

  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::PostHandleEvent(nsIPresContext* aPresContext,
                                     nsEvent *aEvent,
                                     nsIFrame* aTargetFrame,
                                     nsEventStatus* aStatus,
                                     nsIView* aView)
{
  NS_ENSURE_ARG(aPresContext);
  NS_ENSURE_ARG_POINTER(aStatus);
  mCurrentTarget = aTargetFrame;
  NS_IF_RELEASE(mCurrentTargetContent);
  nsresult ret = NS_OK;

  NS_ASSERTION(mCurrentTarget, "mCurrentTarget is null");
  if (!mCurrentTarget) return NS_ERROR_NULL_POINTER;

  nsFrameState state;
  mCurrentTarget->GetFrameState(&state);
  state |= NS_FRAME_EXTERNAL_REFERENCE;
  mCurrentTarget->SetFrameState(state);

  switch (aEvent->message) {
  case NS_MOUSE_LEFT_BUTTON_DOWN:
  case NS_MOUSE_MIDDLE_BUTTON_DOWN:
  case NS_MOUSE_RIGHT_BUTTON_DOWN: 
    {
      if (mConsumeFocusEvents) {
        mConsumeFocusEvents = PR_FALSE;
        break;
      }

      if (nsEventStatus_eConsumeNoDefault != *aStatus) {
        nsCOMPtr<nsIContent> newFocus;
        PRBool suppressBlur = PR_FALSE;
        if (mCurrentTarget) {
          mCurrentTarget->GetContentForEvent(mPresContext, aEvent, getter_AddRefs(newFocus));
          const nsStyleUserInterface* ui;
          mCurrentTarget->GetStyleData(eStyleStruct_UserInterface, ((const nsStyleStruct*&)ui));
          suppressBlur = (ui->mUserFocus == NS_STYLE_USER_FOCUS_IGNORE);
        }

        nsIFrame* currFrame = mCurrentTarget;
        nsCOMPtr<nsIContent> activeContent;
        if (mCurrentTarget)
          mCurrentTarget->GetContent(getter_AddRefs(activeContent));

        // Look for the nearest enclosing focusable frame.
        while (currFrame) {
          const nsStyleUserInterface* ui;
          currFrame->GetStyleData(eStyleStruct_UserInterface, ((const nsStyleStruct*&)ui));
          if ((ui->mUserFocus != NS_STYLE_USER_FOCUS_IGNORE) &&
              (ui->mUserFocus != NS_STYLE_USER_FOCUS_NONE)) {
            currFrame->GetContent(getter_AddRefs(newFocus));
            nsCOMPtr<nsIDOMElement> domElement(do_QueryInterface(newFocus));
            if (domElement)
              break;
          }
          currFrame->GetParent(&currFrame);
        }

        if (newFocus && currFrame)
          ChangeFocus(newFocus);
        else if (!suppressBlur) {
          SetContentState(nsnull, NS_EVENT_STATE_FOCUS);
        }

        // The rest is left button-specific.
        if (aEvent->message != NS_MOUSE_LEFT_BUTTON_DOWN)
          break;

        if (activeContent) {
          // The nearest enclosing element goes into the
          // :active state.  If we fail the QI to DOMElement,
          // then we know we're only a node, and that we need
          // to obtain our parent element and put it into :active
          // instead.
          nsCOMPtr<nsIDOMElement> elt(do_QueryInterface(activeContent));
          if (!elt) {
            nsCOMPtr<nsIContent> par;
            activeContent->GetParent(*getter_AddRefs(par));
            if (par)
              activeContent = par;
          }
          SetContentState(activeContent, NS_EVENT_STATE_ACTIVE);
        }
      }
      else {
        // if we're here, the event handler returned false, so stop
        // any of our own processing of a drag. Workaround for bug 43258.
        StopTrackingDragGesture();      
      }
    }
    break;
  case NS_MOUSE_LEFT_BUTTON_UP:
  case NS_MOUSE_MIDDLE_BUTTON_UP:
  case NS_MOUSE_RIGHT_BUTTON_UP:
    {
      SetContentState(nsnull, NS_EVENT_STATE_ACTIVE);
      if (!mCurrentTarget) {
        nsIFrame* targ;
        GetEventTarget(&targ);
        if (!targ) return NS_ERROR_FAILURE;
      }
      ret = CheckForAndDispatchClick(aPresContext, (nsMouseEvent*)aEvent, aStatus);
      nsCOMPtr<nsIPresShell> shell;
      nsresult rv = aPresContext->GetShell(getter_AddRefs(shell));
      if (NS_SUCCEEDED(rv) && shell){
        nsCOMPtr<nsIFrameSelection> frameSel;
        rv = shell->GetFrameSelection(getter_AddRefs(frameSel));
        if (NS_SUCCEEDED(rv) && frameSel){
            frameSel->SetMouseDownState(PR_FALSE);
        }
      }
    }
    break;
  case NS_MOUSE_SCROLL:
    if (nsEventStatus_eConsumeNoDefault != *aStatus) {
      nsresult rv;
      rv = getPrefService();
      if (NS_FAILED(rv)) return rv;

      nsMouseScrollEvent *msEvent = (nsMouseScrollEvent*) aEvent;
      PRInt32 action = 0;
      PRInt32 numLines = 0;
      PRBool aBool;
      if (msEvent->isShift) {
        mPrefService->GetIntPref("mousewheel.withshiftkey.action", &action);
        mPrefService->GetBoolPref("mousewheel.withshiftkey.sysnumlines",
                                  &aBool);
        if (aBool) {
          numLines = msEvent->delta;
          if (msEvent->scrollFlags & nsMouseScrollEvent::kIsFullPage)
            action = MOUSE_SCROLL_PAGE;
        }
        else
          mPrefService->GetIntPref("mousewheel.withshiftkey.numlines",
                                   &numLines);
      } else if (msEvent->isControl) {
        mPrefService->GetIntPref("mousewheel.withcontrolkey.action", &action);
        mPrefService->GetBoolPref("mousewheel.withcontrolkey.sysnumlines",
                                  &aBool);
        if (aBool) {
          numLines = msEvent->delta;
          if (msEvent->scrollFlags & nsMouseScrollEvent::kIsFullPage)
            action = MOUSE_SCROLL_PAGE;          
        }
        else
          mPrefService->GetIntPref("mousewheel.withcontrolkey.numlines",
                                   &numLines);
      } else if (msEvent->isAlt) {
        mPrefService->GetIntPref("mousewheel.withaltkey.action", &action);
        mPrefService->GetBoolPref("mousewheel.withaltkey.sysnumlines", &aBool);
        if (aBool) {
          numLines = msEvent->delta;
          if (msEvent->scrollFlags & nsMouseScrollEvent::kIsFullPage)
            action = MOUSE_SCROLL_PAGE;
        }
        else
          mPrefService->GetIntPref("mousewheel.withaltkey.numlines",
                                   &numLines);
      } else {
        mPrefService->GetIntPref("mousewheel.withnokey.action", &action);
        mPrefService->GetBoolPref("mousewheel.withnokey.sysnumlines", &aBool);
        if (aBool) {
          numLines = msEvent->delta;
          if (msEvent->scrollFlags & nsMouseScrollEvent::kIsFullPage)
            action = MOUSE_SCROLL_PAGE;
        }
        else
          mPrefService->GetIntPref("mousewheel.withnokey.numlines", &numLines);
      }

      if ((msEvent->delta < 0) && (numLines > 0))
        numLines = -numLines;

      switch (action) {
      case MOUSE_SCROLL_N_LINES:
      case MOUSE_SCROLL_PAGE:
        {
          DoWheelScroll(aPresContext, aTargetFrame, msEvent, numLines,
                        (action == MOUSE_SCROLL_PAGE), PR_FALSE);

        }

        break;

      case MOUSE_SCROLL_HISTORY:
        {
          nsCOMPtr<nsISupports> pcContainer;
          mPresContext->GetContainer(getter_AddRefs(pcContainer));
          if (pcContainer) {
            nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(pcContainer));
            if (webNav) {
              if (msEvent->delta > 0)
                 webNav->GoBack();
              else
                 webNav->GoForward();
            }
          }
        }
        break;

      case MOUSE_SCROLL_TEXTSIZE:
        ChangeTextSize((msEvent->delta > 0) ? 1 : -1);
        break;
      }
      *aStatus = nsEventStatus_eConsumeNoDefault;

    }

    break;

  case NS_DRAGDROP_DROP:
  case NS_DRAGDROP_EXIT:
    // clean up after ourselves. make sure we do this _after_ the event, else we'll
    // clean up too early!
    GenerateDragDropEnterExit(aPresContext, (nsGUIEvent*)aEvent);
    break;

  case NS_KEY_UP:
    if (mBrowseWithCaret) 
      MoveFocusToCaret();
    break;

  case NS_KEY_PRESS:
    if (nsEventStatus_eConsumeNoDefault != *aStatus) {
      nsKeyEvent* keyEvent = (nsKeyEvent*)aEvent;
      //This is to prevent keyboard scrolling while alt modifier in use.
      if (!keyEvent->isAlt) {
        switch(keyEvent->keyCode) {
          case NS_VK_TAB:
            if (mConsumeFocusEvents) {
              mConsumeFocusEvents = PR_FALSE;
              break;
            }
            if (!((nsInputEvent*)aEvent)->isControl) {
              //Shift focus forward or back depending on shift key
              ShiftFocus(!((nsInputEvent*)aEvent)->isShift);
            } else {
              ShiftFocusByDoc(!((nsInputEvent*)aEvent)->isShift);
            }
            *aStatus = nsEventStatus_eConsumeNoDefault;
            break;

          case NS_VK_F6:
            if (mConsumeFocusEvents) {
              mConsumeFocusEvents = PR_FALSE;
              break;
            }
            //Shift focus forward or back depending on shift key
            ShiftFocusByDoc(!((nsInputEvent*)aEvent)->isShift);
            *aStatus = nsEventStatus_eConsumeNoDefault;
            break;

//the problem is that viewer does not have xul so we cannot completely eliminate these
#if NON_KEYBINDING
          case NS_VK_PAGE_DOWN:
          case NS_VK_PAGE_UP:
            if (!mCurrentFocus) {
              nsIScrollableView* sv = GetNearestScrollingView(aView);
              if (sv) {
                nsKeyEvent * keyEvent = (nsKeyEvent *)aEvent;
                sv->ScrollByPages((keyEvent->keyCode != NS_VK_PAGE_UP) ? 1 : -1);
              }
            }
            break;
          case NS_VK_HOME: 
          case NS_VK_END:
            if (!mCurrentFocus) {
              nsIScrollableView* sv = GetNearestScrollingView(aView);
              if (sv) {
                nsKeyEvent * keyEvent = (nsKeyEvent *)aEvent;
                sv->ScrollByWhole((keyEvent->keyCode != NS_VK_HOME) ? PR_FALSE : PR_TRUE);
              }
            }
            break;
          case NS_VK_DOWN: 
          case NS_VK_UP:
            if (!mCurrentFocus) {
              nsIScrollableView* sv = GetNearestScrollingView(aView);
              if (sv) {
                nsKeyEvent * keyEvent = (nsKeyEvent *)aEvent;
                sv->ScrollByLines(0, (keyEvent->keyCode == NS_VK_DOWN) ? 1 : -1);
              
                // force the update to happen now, otherwise multiple scrolls can
                // occur before the update is processed. (bug #7354)
                nsIViewManager* vm = nsnull;
             	  if (NS_OK == aView->GetViewManager(vm) && nsnull != vm) {
             	    // I'd use Composite here, but it doesn't always work.
                  // vm->Composite();
                  vm->ForceUpdate();
                  NS_RELEASE(vm);
                }
              }
            }
            break;
          case NS_VK_LEFT: 
          case NS_VK_RIGHT:
            if (!mCurrentFocus) {
              nsIScrollableView* sv = GetNearestScrollingView(aView);
              if (sv) {
                nsKeyEvent * keyEvent = (nsKeyEvent *)aEvent;
                sv->ScrollByLines((keyEvent->keyCode == NS_VK_RIGHT) ? 1 : -1, 0);
              
                // force the update to happen now, otherwise multiple scrolls can
                // occur before the update is processed. (bug #7354)
                nsIViewManager* vm = nsnull;
             	  if (NS_OK == aView->GetViewManager(vm) && nsnull != vm) {
             	    // I'd use Composite here, but it doesn't always work.
                  // vm->Composite();
                  vm->ForceUpdate();
                  NS_RELEASE(vm);
                }
              }
            }
            break;
        case 0: /* check charcode since keycode is 0 */
          {
          //Spacebar
            nsKeyEvent * keyEvent = (nsKeyEvent *)aEvent;
            if (keyEvent->charCode == 0x20) {
              if (!mCurrentFocus) {
                nsIScrollableView* sv = GetNearestScrollingView(aView);
                if (sv) {
                  sv->ScrollByPages(1);
                }
              }
            }
          }
          break;
#endif //NON_KEYBINDING
        }
      }
    }
  case NS_MOUSE_ENTER:
    nsCOMPtr<nsIContent> targetContent;
    if (mCurrentTarget) {
      mCurrentTarget->GetContentForEvent(aPresContext, aEvent,
                                         getter_AddRefs(targetContent));
      SetContentState(targetContent, NS_EVENT_STATE_HOVER);
    }
    break;

  }

  //Reset target frame to null to avoid mistargeting after reentrant event
  mCurrentTarget = nsnull;

  return ret;
}

NS_IMETHODIMP
nsEventStateManager::SetPresContext(nsIPresContext* aPresContext)
{
  if (aPresContext == nsnull) {
    // A pres context is going away. Make sure we do cleanup.
    if (mPresContext == gLastFocusedPresContext) {
      gLastFocusedPresContext = nsnull;
      NS_IF_RELEASE(gLastFocusedDocument);
      NS_IF_RELEASE(gLastFocusedContent);
    }
  }

  mPresContext = aPresContext;
  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::ClearFrameRefs(nsIFrame* aFrame)
{
  if (aFrame == mLastMouseOverFrame)
    mLastMouseOverFrame = nsnull;
  if (aFrame == mLastDragOverFrame)
    mLastDragOverFrame = nsnull;
  if (aFrame == mGestureDownFrame) {
    mGestureDownFrame = nsnull;
 #if CLICK_HOLD_CONTEXT_MENUS
    mEventDownWidget = nsnull;
    mEventPresContext = nsnull;
#endif
  }
  if (aFrame == mCurrentTarget) {
    if (aFrame) {
      aFrame->GetContent(&mCurrentTargetContent);
    }
    mCurrentTarget = nsnull;
  }
  

  return NS_OK;
}

nsIScrollableView*
nsEventStateManager::GetNearestScrollingView(nsIView* aView)
{
  nsIScrollableView* sv;
  if (NS_OK == aView->QueryInterface(NS_GET_IID(nsIScrollableView),
                                     (void**)&sv)) {
    return sv;
  }

  nsIView* parent;
  aView->GetParent(parent);

  if (nsnull != parent) {
    return GetNearestScrollingView(parent);
  }

  return nsnull;
}

PRBool
nsEventStateManager::CheckDisabled(nsIContent* aContent)
{
  PRBool disabled = PR_FALSE;

  nsCOMPtr<nsIAtom> tag;
  aContent->GetTag(*getter_AddRefs(tag));

  if (nsHTMLAtoms::input == tag.get() ||
      nsHTMLAtoms::select == tag.get() ||
      nsHTMLAtoms::textarea == tag.get() ||
      nsHTMLAtoms::button == tag.get()) {
    nsAutoString empty;
    if (NS_CONTENT_ATTR_HAS_VALUE == aContent->GetAttr(kNameSpaceID_HTML, 
                                                       nsHTMLAtoms::disabled,
                                                       empty)) {
      disabled = PR_TRUE;
    }
  }
  
  return disabled;
}

void
nsEventStateManager::UpdateCursor(nsIPresContext* aPresContext, nsEvent* aEvent, nsIFrame* aTargetFrame, 
                                  nsEventStatus* aStatus)
{
  PRInt32 cursor;

  //If cursor is locked just use the locked one
  if (mLockCursor) {
    cursor = mLockCursor;
  }
  //If not locked, look for correct cursor
  else {
    nsCOMPtr<nsIContent> targetContent;
    if (mCurrentTarget) {
      mCurrentTarget->GetContent(getter_AddRefs(targetContent));
    }

    //Check if the current target is disabled.  If so use the default pointer.
    if (targetContent && CheckDisabled(targetContent)) {
      cursor = NS_STYLE_CURSOR_DEFAULT;
    }
    //If not disabled, check for the right cursor.
    else {
      if (aTargetFrame) {
        aTargetFrame->GetCursor(aPresContext, aEvent->point, cursor);
      }
    }
  }

  // Check whether or not to show the busy cursor
  nsCOMPtr<nsISupports> pcContainer;
  aPresContext->GetContainer(getter_AddRefs(pcContainer));    
  nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(pcContainer));    
  if (!docShell) return;
  PRUint32 busyFlags = nsIDocShell::BUSY_FLAGS_NONE;
  docShell->GetBusyFlags(&busyFlags);

  // Show busy cursor everywhere before page loads
  // and just replace the arrow cursor after page starts loading
  if (busyFlags & nsIDocShell::BUSY_FLAGS_BUSY &&
        (cursor == NS_STYLE_CURSOR_AUTO || cursor == NS_STYLE_CURSOR_DEFAULT))
  {
    cursor = NS_STYLE_CURSOR_SPINNING;
  }
 
  if (aTargetFrame) {
    nsCOMPtr<nsIWidget> window;
    aTargetFrame->GetWindow(aPresContext, getter_AddRefs(window));
    SetCursor(cursor, window, PR_FALSE);
  }

  if (mLockCursor || NS_STYLE_CURSOR_AUTO != cursor) {
    *aStatus = nsEventStatus_eConsumeDoDefault;
  }
}

NS_IMETHODIMP
nsEventStateManager::SetCursor(PRInt32 aCursor, nsIWidget* aWidget, PRBool aLockCursor)
{
  nsCursor c;

  NS_ENSURE_TRUE(aWidget, NS_ERROR_FAILURE);
  if (aLockCursor) {
    if (NS_STYLE_CURSOR_AUTO != aCursor) {
      mLockCursor = aCursor;
    }
    else {
      //If cursor style is set to auto we unlock the cursor again.
      mLockCursor = 0;
    }
  }
  switch (aCursor) {
  default:
  case NS_STYLE_CURSOR_AUTO:
  case NS_STYLE_CURSOR_DEFAULT:
    c = eCursor_standard;
    break;
  case NS_STYLE_CURSOR_POINTER:
    c = eCursor_hyperlink;
    break;
  case NS_STYLE_CURSOR_CROSSHAIR:
    c = eCursor_crosshair;
    break;
  case NS_STYLE_CURSOR_MOVE:
    c = eCursor_move;
    break;
  case NS_STYLE_CURSOR_TEXT:
    c = eCursor_select;
    break;
  case NS_STYLE_CURSOR_WAIT:
    c = eCursor_wait;
    break;
  case NS_STYLE_CURSOR_HELP:
    c = eCursor_help;
    break;
  case NS_STYLE_CURSOR_N_RESIZE:
  case NS_STYLE_CURSOR_S_RESIZE:
    c = eCursor_sizeNS;
    break;
  case NS_STYLE_CURSOR_W_RESIZE:
  case NS_STYLE_CURSOR_E_RESIZE:
    c = eCursor_sizeWE;
    break;
  case NS_STYLE_CURSOR_NW_RESIZE:
    c = eCursor_sizeNW;
    break;
  case NS_STYLE_CURSOR_SE_RESIZE:
    c = eCursor_sizeSE;
    break;
  case NS_STYLE_CURSOR_NE_RESIZE:
    c = eCursor_sizeNE;
    break;
  case NS_STYLE_CURSOR_SW_RESIZE:
    c = eCursor_sizeSW;
    break;
  case NS_STYLE_CURSOR_COPY: // CSS3
    c = eCursor_copy;
    break;
  case NS_STYLE_CURSOR_ALIAS:
    c = eCursor_alias;
    break;
  case NS_STYLE_CURSOR_CONTEXT_MENU:
    c = eCursor_context_menu;
    break;
  case NS_STYLE_CURSOR_CELL:
    c = eCursor_cell;
    break;
  case NS_STYLE_CURSOR_GRAB:
    c = eCursor_grab;
    break;
  case NS_STYLE_CURSOR_GRABBING:
    c = eCursor_grabbing;
    break;
  case NS_STYLE_CURSOR_SPINNING:
    c = eCursor_spinning;
    break;
  case NS_STYLE_CURSOR_COUNT_UP:
    c = eCursor_count_up;
    break;
  case NS_STYLE_CURSOR_COUNT_DOWN:
    c = eCursor_count_down;
    break;
  case NS_STYLE_CURSOR_COUNT_UP_DOWN:
    c = eCursor_count_up_down;
    break;
  }

  aWidget->SetCursor(c);

  return NS_OK;
}

void
nsEventStateManager::GenerateMouseEnterExit(nsIPresContext* aPresContext, nsGUIEvent* aEvent)
{
  //Hold onto old target content through the event and reset after.
  nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;

  switch(aEvent->message) {
  case NS_MOUSE_MOVE:
    {
      nsCOMPtr<nsIContent> targetContent;
      if (mCurrentTarget) {
        mCurrentTarget->GetContentForEvent(aPresContext, aEvent, getter_AddRefs(targetContent));
      }

      if (mLastMouseOverContent.get() != targetContent.get()) {

        //Before firing mouseout, check for recursion
        if (mLastMouseOverContent.get() != mFirstMouseOutEventContent.get()) {
        
          //Store the first mouseOut event we fire and don't refire mouseOut
          //to that element while the first mouseOut is still ongoing.
          mFirstMouseOutEventContent = mLastMouseOverContent;

          if (mLastMouseOverFrame) {
            //fire mouseout
            nsEventStatus status = nsEventStatus_eIgnore;
            nsMouseEvent event;
            event.eventStructType = NS_MOUSE_EVENT;
            event.message = NS_MOUSE_EXIT_SYNTH;
            event.widget = aEvent->widget;
            event.clickCount = 0;
            event.point = aEvent->point;
            event.refPoint = aEvent->refPoint;
            event.isShift = ((nsMouseEvent*)aEvent)->isShift;
            event.isControl = ((nsMouseEvent*)aEvent)->isControl;
            event.isAlt = ((nsMouseEvent*)aEvent)->isAlt;
            event.isMeta = ((nsMouseEvent*)aEvent)->isMeta;
            event.nativeMsg = ((nsMouseEvent*)aEvent)->nativeMsg;

            mCurrentTargetContent = mLastMouseOverContent;
            NS_IF_ADDREF(mCurrentTargetContent);
            mCurrentRelatedContent = targetContent;
            NS_IF_ADDREF(mCurrentRelatedContent);

            //XXX This event should still go somewhere!!
            if (mLastMouseOverContent) {
              mLastMouseOverContent->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 
            }

            //Now dispatch to the frame
            if (mLastMouseOverFrame) {
              //XXX Get the new frame
              mLastMouseOverFrame->HandleEvent(aPresContext, &event, &status);   
            }

            NS_IF_RELEASE(mCurrentTargetContent);
            NS_IF_RELEASE(mCurrentRelatedContent);

            mFirstMouseOutEventContent = nsnull;
          }
        }

        //Before firing mouseover, check for recursion
        if (targetContent.get() != mFirstMouseOverEventContent.get()) {
        
          //Store the first mouseOver event we fire and don't refire mouseOver
          //to that element while the first mouseOver is still ongoing.
          mFirstMouseOverEventContent = targetContent;

          //fire mouseover
          nsEventStatus status = nsEventStatus_eIgnore;
          nsMouseEvent event;
          event.eventStructType = NS_MOUSE_EVENT;
          event.message = NS_MOUSE_ENTER_SYNTH;
          event.widget = aEvent->widget;
          event.clickCount = 0;
          event.point = aEvent->point;
          event.refPoint = aEvent->refPoint;
          event.isShift = ((nsMouseEvent*)aEvent)->isShift;
          event.isControl = ((nsMouseEvent*)aEvent)->isControl;
          event.isAlt = ((nsMouseEvent*)aEvent)->isAlt;
          event.isMeta = ((nsMouseEvent*)aEvent)->isMeta;
          event.nativeMsg = ((nsMouseEvent*)aEvent)->nativeMsg;

          mCurrentTargetContent = targetContent;
          NS_IF_ADDREF(mCurrentTargetContent);
          mCurrentRelatedContent = mLastMouseOverContent;
          NS_IF_ADDREF(mCurrentRelatedContent);

          //XXX This event should still go somewhere!!
          if (targetContent) {
            targetContent->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 
          }
        
          if ( status != nsEventStatus_eConsumeNoDefault )
            SetContentState(targetContent, NS_EVENT_STATE_HOVER);
          
          //Now dispatch to the frame
          if (mCurrentTarget) {
            //XXX Get the new frame
            mCurrentTarget->HandleEvent(aPresContext, &event, &status);
          }

          NS_IF_RELEASE(mCurrentTargetContent);
          NS_IF_RELEASE(mCurrentRelatedContent);
          mLastMouseOverFrame = mCurrentTarget;
          mLastMouseOverContent = targetContent;

          mFirstMouseOverEventContent = nsnull;
        }
      }
    }
    break;
  case NS_MOUSE_EXIT:
    {
      //This is actually the window mouse exit event.
      if (nsnull != mLastMouseOverFrame) {
        //Before firing mouseout, check for recursion
        if (mLastMouseOverContent.get() != mFirstMouseOutEventContent.get()) {
    
          //Store the first mouseOut event we fire and don't refire mouseOut
          //to that element while the first mouseOut is still ongoing.
          mFirstMouseOutEventContent = mLastMouseOverContent;

          //fire mouseout
          nsEventStatus status = nsEventStatus_eIgnore;
          nsMouseEvent event;
          event.eventStructType = NS_MOUSE_EVENT;
          event.message = NS_MOUSE_EXIT_SYNTH;
          event.widget = aEvent->widget;
          event.clickCount = 0;
          event.point = aEvent->point;
          event.refPoint = aEvent->refPoint;
          event.isShift = ((nsMouseEvent*)aEvent)->isShift;
          event.isControl = ((nsMouseEvent*)aEvent)->isControl;
          event.isAlt = ((nsMouseEvent*)aEvent)->isAlt;
          event.isMeta = ((nsMouseEvent*)aEvent)->isMeta;
          event.nativeMsg = ((nsMouseEvent*)aEvent)->nativeMsg;

          mCurrentTargetContent = mLastMouseOverContent;
          NS_IF_ADDREF(mCurrentTargetContent);
          mCurrentRelatedContent = nsnull;

          if (mLastMouseOverContent) {
            mLastMouseOverContent->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 

            if ( status != nsEventStatus_eConsumeNoDefault )
              SetContentState(nsnull, NS_EVENT_STATE_HOVER);
          }

          //Now dispatch to the frame
          if (nsnull != mLastMouseOverFrame) {
            //XXX Get the new frame
            mLastMouseOverFrame->HandleEvent(aPresContext, &event, &status);   
            mLastMouseOverFrame = nsnull;
            mLastMouseOverContent = nsnull;
          }

          NS_IF_RELEASE(mCurrentTargetContent);

          mFirstMouseOutEventContent = nsnull;
        }
      }
    }
    break;
  }

  //reset mCurretTargetContent to what it was
  mCurrentTargetContent = targetBeforeEvent;
}

void
nsEventStateManager::GenerateDragDropEnterExit(nsIPresContext* aPresContext, nsGUIEvent* aEvent)
{
  //Hold onto old target content through the event and reset after.
  nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;

  switch(aEvent->message) {
  case NS_DRAGDROP_OVER:
    {
      if (mLastDragOverFrame != mCurrentTarget) {
        //We'll need the content, too, to check if it changed separately from the frames.
        nsCOMPtr<nsIContent> lastContent;
        nsCOMPtr<nsIContent> targetContent;
        mCurrentTarget->GetContentForEvent(aPresContext, aEvent, getter_AddRefs(targetContent));

        if ( mLastDragOverFrame ) {
          //fire drag exit
          nsEventStatus status = nsEventStatus_eIgnore;
          nsMouseEvent event;
          event.eventStructType = NS_DRAGDROP_EVENT;
          event.message = NS_DRAGDROP_EXIT_SYNTH;
          event.widget = aEvent->widget;
          event.clickCount = 0;
          event.point = aEvent->point;
          event.refPoint = aEvent->refPoint;
          event.isShift = ((nsMouseEvent*)aEvent)->isShift;
          event.isControl = ((nsMouseEvent*)aEvent)->isControl;
          event.isAlt = ((nsMouseEvent*)aEvent)->isAlt;
          event.isMeta = ((nsMouseEvent*)aEvent)->isMeta;

          //The frame has change but the content may not have.  Check before dispatching to content
          mLastDragOverFrame->GetContentForEvent(aPresContext, aEvent, getter_AddRefs(lastContent));

          mCurrentTargetContent = lastContent;
          NS_IF_ADDREF(mCurrentTargetContent);
          mCurrentRelatedContent = targetContent;
          NS_IF_ADDREF(mCurrentRelatedContent);

          if ( lastContent != targetContent ) {
            //XXX This event should still go somewhere!!
            if (lastContent)
              lastContent->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 

            // clear the drag hover
            if (status != nsEventStatus_eConsumeNoDefault )
              SetContentState(nsnull, NS_EVENT_STATE_DRAGOVER);
          }

          // Finally dispatch exit to the frame
          if ( mLastDragOverFrame ) {
            mLastDragOverFrame->HandleEvent(aPresContext, &event, &status);   

          NS_IF_RELEASE(mCurrentTargetContent);
          NS_IF_RELEASE(mCurrentRelatedContent);

          }
        }

        //fire drag enter
        nsEventStatus status = nsEventStatus_eIgnore;
        nsMouseEvent event;
        event.eventStructType = NS_DRAGDROP_EVENT;
        event.message = NS_DRAGDROP_ENTER;
        event.widget = aEvent->widget;
        event.clickCount = 0;
        event.point = aEvent->point;
        event.refPoint = aEvent->refPoint;
        event.isShift = ((nsMouseEvent*)aEvent)->isShift;
        event.isControl = ((nsMouseEvent*)aEvent)->isControl;
        event.isAlt = ((nsMouseEvent*)aEvent)->isAlt;
        event.isMeta = ((nsMouseEvent*)aEvent)->isMeta;

        mCurrentTargetContent = targetContent;
        NS_IF_ADDREF(mCurrentTargetContent);
        mCurrentRelatedContent = lastContent;
        NS_IF_ADDREF(mCurrentRelatedContent);

        //The frame has change but the content may not have.  Check before dispatching to content
        if ( lastContent != targetContent ) {
          //XXX This event should still go somewhere!!
          if ( targetContent ) 
            targetContent->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 

          // set drag hover on this frame
          if ( status != nsEventStatus_eConsumeNoDefault )
            SetContentState(targetContent, NS_EVENT_STATE_DRAGOVER);
        }

        // Finally dispatch to the frame
        if (mCurrentTarget) {
          //XXX Get the new frame
          mCurrentTarget->HandleEvent(aPresContext, &event, &status);
        }

        NS_IF_RELEASE(mCurrentTargetContent);
        NS_IF_RELEASE(mCurrentRelatedContent);
        mLastDragOverFrame = mCurrentTarget;
      }
    }
    break;
    
  case NS_DRAGDROP_DROP:
  case NS_DRAGDROP_EXIT:
    {
      //This is actually the window mouse exit event.
      if ( mLastDragOverFrame ) {

        // fire mouseout
        nsEventStatus status = nsEventStatus_eIgnore;
        nsMouseEvent event;
        event.eventStructType = NS_DRAGDROP_EVENT;
        event.message = NS_DRAGDROP_EXIT_SYNTH;
        event.widget = aEvent->widget;
        event.clickCount = 0;
        event.point = aEvent->point;
        event.refPoint = aEvent->refPoint;
        event.isShift = ((nsMouseEvent*)aEvent)->isShift;
        event.isControl = ((nsMouseEvent*)aEvent)->isControl;
        event.isAlt = ((nsMouseEvent*)aEvent)->isAlt;
        event.isMeta = ((nsMouseEvent*)aEvent)->isMeta;

        // dispatch to content via DOM
        nsCOMPtr<nsIContent> lastContent;
        mLastDragOverFrame->GetContentForEvent(aPresContext, aEvent, getter_AddRefs(lastContent));

        mCurrentTargetContent = lastContent;
        NS_IF_ADDREF(mCurrentTargetContent);
        mCurrentRelatedContent = nsnull;

        if ( lastContent ) {
          lastContent->HandleDOMEvent(aPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 
          if ( status != nsEventStatus_eConsumeNoDefault )
            SetContentState(nsnull, NS_EVENT_STATE_DRAGOVER);
        }

        // Finally dispatch to the frame
        if ( mLastDragOverFrame ) {
          //XXX Get the new frame
          mLastDragOverFrame->HandleEvent(aPresContext, &event, &status);   
          mLastDragOverFrame = nsnull;
        }

        NS_IF_RELEASE(mCurrentTargetContent);
     }
    }
    break;
  }

  //reset mCurretTargetContent to what it was
  mCurrentTargetContent = targetBeforeEvent;

  // Now flush all pending notifications.
  FlushPendingEvents(aPresContext);
}

NS_IMETHODIMP
nsEventStateManager::SetClickCount(nsIPresContext* aPresContext, 
                                   nsMouseEvent *aEvent,
                                   nsEventStatus* aStatus)
{
  nsresult ret = NS_OK;
  nsCOMPtr<nsIContent> mouseContent;

  mCurrentTarget->GetContentForEvent(aPresContext, aEvent, getter_AddRefs(mouseContent));

  switch (aEvent->message) {
  case NS_MOUSE_LEFT_BUTTON_DOWN:
    NS_IF_RELEASE(mLastLeftMouseDownContent);
    mLastLeftMouseDownContent = mouseContent;
    NS_IF_ADDREF(mLastLeftMouseDownContent);
    break;

  case NS_MOUSE_LEFT_BUTTON_UP:
    if (mLastLeftMouseDownContent == mouseContent.get()) {
      aEvent->clickCount = mLClickCount;
      mLClickCount = 0;
    }
    else {
      aEvent->clickCount = 0;
    }
    NS_IF_RELEASE(mLastLeftMouseDownContent);
    break;

  case NS_MOUSE_MIDDLE_BUTTON_DOWN:
    NS_IF_RELEASE(mLastMiddleMouseDownContent);
    mLastMiddleMouseDownContent = mouseContent;
    NS_IF_ADDREF(mLastMiddleMouseDownContent);
    break;

  case NS_MOUSE_MIDDLE_BUTTON_UP:
    if (mLastMiddleMouseDownContent == mouseContent.get()) {
      aEvent->clickCount = mMClickCount;
      mMClickCount = 0;
    }
    else {
      aEvent->clickCount = 0;
    }
    NS_IF_RELEASE(mLastMiddleMouseDownContent);
    break;

  case NS_MOUSE_RIGHT_BUTTON_DOWN:
    NS_IF_RELEASE(mLastRightMouseDownContent);
    mLastRightMouseDownContent = mouseContent;
    NS_IF_ADDREF(mLastRightMouseDownContent);
    break;

  case NS_MOUSE_RIGHT_BUTTON_UP:
    if (mLastRightMouseDownContent == mouseContent.get()) {
      aEvent->clickCount = mRClickCount;
      mRClickCount = 0;
    }
    else {
      aEvent->clickCount = 0;
    }
    NS_IF_RELEASE(mLastRightMouseDownContent);
    break;
  }

  return ret;
}

NS_IMETHODIMP
nsEventStateManager::CheckForAndDispatchClick(nsIPresContext* aPresContext, 
                                              nsMouseEvent *aEvent,
                                              nsEventStatus* aStatus)
{
  nsresult ret = NS_OK;
  nsMouseEvent event;
  nsCOMPtr<nsIContent> mouseContent;
  PRInt32 flags = NS_EVENT_FLAG_INIT;

  mCurrentTarget->GetContentForEvent(aPresContext, aEvent, getter_AddRefs(mouseContent));

  //If mouse is still over same element, clickcount will be > 1.
  //If it has moved it will be zero, so no click.
  if (0 != aEvent->clickCount) {
    //fire click
    switch (aEvent->message) {
    case NS_MOUSE_LEFT_BUTTON_UP:
      event.message = NS_MOUSE_LEFT_CLICK;
      break;
    case NS_MOUSE_MIDDLE_BUTTON_UP:
      event.message = NS_MOUSE_MIDDLE_CLICK;
      flags |= mLeftClickOnly ? NS_EVENT_FLAG_NO_CONTENT_DISPATCH : NS_EVENT_FLAG_NONE;
      break;
    case NS_MOUSE_RIGHT_BUTTON_UP:
      event.message = NS_MOUSE_RIGHT_CLICK;
      flags |= mLeftClickOnly ? NS_EVENT_FLAG_NO_CONTENT_DISPATCH : NS_EVENT_FLAG_NONE;
      break;
    }

    event.eventStructType = NS_MOUSE_EVENT;
    event.widget = aEvent->widget;
    event.point = aEvent->point;
    event.refPoint = aEvent->refPoint;
    event.clickCount = aEvent->clickCount;
    event.isShift = aEvent->isShift;
    event.isControl = aEvent->isControl;
    event.isAlt = aEvent->isAlt;
    event.isMeta = aEvent->isMeta;

    nsCOMPtr<nsIPresShell> presShell;
    mPresContext->GetShell(getter_AddRefs(presShell));
    if (presShell) {
      ret = presShell->HandleEventWithTarget(&event, mCurrentTarget, mouseContent, flags, aStatus);
      if (NS_SUCCEEDED(ret) && aEvent->clickCount == 2) {
        nsMouseEvent event2;
        //fire double click
        switch (aEvent->message) {
        case NS_MOUSE_LEFT_BUTTON_UP:
          event2.message = NS_MOUSE_LEFT_DOUBLECLICK;
          break;
        case NS_MOUSE_MIDDLE_BUTTON_UP:
          event2.message = NS_MOUSE_MIDDLE_DOUBLECLICK;
          break;
        case NS_MOUSE_RIGHT_BUTTON_UP:
          event2.message = NS_MOUSE_RIGHT_DOUBLECLICK;
          break;
        }
        
        event2.eventStructType = NS_MOUSE_EVENT;
        event2.widget = aEvent->widget;
        event2.point = aEvent->point;
        event2.refPoint = aEvent->refPoint;
        event2.clickCount = aEvent->clickCount;
        event2.isShift = aEvent->isShift;
        event2.isControl = aEvent->isControl;
        event2.isAlt = aEvent->isAlt;
        event2.isMeta = aEvent->isMeta;

        ret = presShell->HandleEventWithTarget(&event2, mCurrentTarget, mouseContent, flags, aStatus);
      }
    }
  }
  return ret;
}

PRBool
nsEventStateManager::ChangeFocus(nsIContent* aFocusContent)
{
  aFocusContent->SetFocus(mPresContext);
  MoveCaretToFocus();

  return PR_FALSE;
}

//---------------------------------------------------------
// Debug Helpers
#ifdef DEBUG_DOCSHELL_FOCUS
static void 
PrintDocTree(nsIDocShellTreeNode * aParentNode, int aLevel)
{
  for (PRInt32 i=0;i<aLevel;i++) printf("  ");

  PRInt32 childWebshellCount;
  aParentNode->GetChildCount(&childWebshellCount);
  nsCOMPtr<nsIDocShell> parentAsDocShell(do_QueryInterface(aParentNode));
  nsCOMPtr<nsIDocShellTreeItem> parentAsItem(do_QueryInterface(aParentNode));
  PRInt32 type;
  parentAsItem->GetItemType(&type);
  nsCOMPtr<nsIPresShell> presShell;
  parentAsDocShell->GetPresShell(getter_AddRefs(presShell));
  nsCOMPtr<nsIPresContext> presContext;
  parentAsDocShell->GetPresContext(getter_AddRefs(presContext));
  nsCOMPtr<nsIDocument> doc;
  presShell->GetDocument(getter_AddRefs(doc));

  nsCOMPtr<nsIScriptGlobalObject> sgo;
  doc->GetScriptGlobalObject(getter_AddRefs(sgo));
  nsCOMPtr<nsIDOMWindowInternal> domwin(do_QueryInterface(sgo));

  nsCOMPtr<nsIWidget> widget;
  nsCOMPtr<nsIViewManager> vm;
  presShell->GetViewManager(getter_AddRefs(vm));
  if (vm) {
    vm->GetWidget(getter_AddRefs(widget));
  }
  nsCOMPtr<nsIEventStateManager> esm;
  presContext->GetEventStateManager(getter_AddRefs(esm));

  printf("DS %p  Type %s  Cnt %d  Doc %p  DW %p  EM %p\n", 
    parentAsDocShell.get(), 
    type==nsIDocShellTreeItem::typeChrome?"Chrome":"Content", 
    childWebshellCount, doc.get(), domwin.get(), esm.get());

  if (childWebshellCount > 0) {
    for (PRInt32 i=0;i<childWebshellCount;i++) {
      nsCOMPtr<nsIDocShellTreeItem> child;
      aParentNode->GetChildAt(i, getter_AddRefs(child));
      nsCOMPtr<nsIDocShellTreeNode> childAsNode(do_QueryInterface(child));
      PrintDocTree(childAsNode, aLevel+1);
    }
  }
}
#endif // end debug helpers

NS_IMETHODIMP
nsEventStateManager::ShiftFocus(PRBool forward, nsIContent* aStart)
{
#ifdef DEBUG_DOCSHELL_FOCUS
  printf("[%p] ShiftFocus: forward=%d, aStart=%p, mCurrentFocus=%p\n",
         this, forward, aStart, mCurrentFocus);
#endif
  NS_ASSERTION(mPresContext, "no pres context");
  EnsureDocument(mPresContext);
  NS_ASSERTION(mDocument, "no document");

  nsCOMPtr<nsIContent> rootContent;
  mDocument->GetRootContent(getter_AddRefs(rootContent));

  nsCOMPtr<nsISupports> pcContainer;
  mPresContext->GetContainer(getter_AddRefs(pcContainer));
  NS_ASSERTION(pcContainer, "no container for presContext");
  
  nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(pcContainer);
  PRBool docHasFocus = PR_FALSE;

  // allowWrapAround specifies whether shift+tab (when focus is null)
  // will start at the end of the document (such as when we're coming 
  // from an unfocused state), or pop out to the parent document
  // (such as when we have "canvas focus")
  PRBool allowWrapAround = PR_FALSE;

  if (aStart) {
    NS_IF_RELEASE(mCurrentFocus);
    mCurrentFocus = aStart;
    NS_ADDREF(mCurrentFocus);

    nsAutoString tabIndexStr;
    mCurrentFocus->GetAttr(kNameSpaceID_None, nsHTMLAtoms::tabindex, tabIndexStr);
    if (!tabIndexStr.IsEmpty()) {
      PRInt32 ec, tabIndexVal = tabIndexStr.ToInteger(&ec);
      if (NS_SUCCEEDED(ec))
        mCurrentTabIndex = tabIndexVal;
    }
  } else if (!mCurrentFocus && !mBrowseWithCaret) {
    // mCurrentFocus is ambiguous for determining whether
    // we're in document-focus mode, because it's nulled out
    // when the document is blurred, and it's also nulled out
    // when the document/canvas has focus.
    //
    // So, use the docshell focus state to disambiguate.

    docShell->GetHasFocus(&docHasFocus);
    if (forward) {
      mCurrentFocus = rootContent;
      NS_IF_ADDREF(mCurrentFocus);
      mCurrentTabIndex = 1;
    } else if (!docHasFocus) {
      // Only wrap around from the end if we're coming from an
      // unfocused state.  By not setting curFocusFrame, we will
      // cause GetNextTabbableContent to start over at the beginning/end.

      allowWrapAround = PR_TRUE;
      mCurrentTabIndex = 0;
    }
  }

  nsCOMPtr<nsIPresShell> presShell;
  mPresContext->GetShell(getter_AddRefs(presShell));

  nsIFrame* curFocusFrame = nsnull;

  if (mBrowseWithCaret) {
    nsCOMPtr<nsIContent> caretContent;
    PRUint32 caretOffset;
    GetCaretLocation(getter_AddRefs(caretContent), &curFocusFrame, &caretOffset);
  } else if (!allowWrapAround && mCurrentFocus)
    presShell->GetPrimaryFrameFor(mCurrentFocus, &curFocusFrame);

  nsCOMPtr<nsIContent> nextFocus;
  if (forward || !docHasFocus)
    GetNextTabbableContent(rootContent, curFocusFrame, forward,
                           getter_AddRefs(nextFocus));

  if (nextFocus) {

    // Check to see if the next focused element has a subshell.
    // This is the case for an IFRAME or FRAME element.  If it
    // does, we send focus into the subshell.

    nsCOMPtr<nsISupports> shellObject;
    presShell->GetSubShellFor(nextFocus, getter_AddRefs(shellObject));
    if (shellObject) {
      nsCOMPtr<nsIDocShell> subShell = do_QueryInterface(shellObject);
      if (subShell) {
        SetContentState(nsnull, NS_EVENT_STATE_FOCUS);

        nsIFrame* nextFocusFrame = nsnull;
        presShell->GetPrimaryFrameFor(nextFocus, &nextFocusFrame);
        presShell->ScrollFrameIntoView(nextFocusFrame, NS_PRESSHELL_SCROLL_ANYWHERE,
                                       NS_PRESSHELL_SCROLL_ANYWHERE);
        TabIntoDocument(subShell, forward);
      }
    } else {
      // there is no subshell, so just focus nextFocus
#ifdef DEBUG_DOCSHELL_FOCUS
      printf("focusing next focusable content: %p\n", nextFocus.get());
#endif
      presShell->GetPrimaryFrameFor(nextFocus, &mCurrentTarget);
      ChangeFocus(nextFocus);
      
      NS_IF_RELEASE(mCurrentFocus);
      mCurrentFocus = nextFocus;
      NS_ADDREF(mCurrentFocus);

      if (docHasFocus)
        docShell->SetCanvasHasFocus(PR_FALSE);
      else
        docShell->SetHasFocus(PR_TRUE);
    }
  } else {
    
    // If we're going backwards past the first content,
    // focus the document.
    
    PRBool focusDocument;
    PRInt32 itemType;
    nsCOMPtr<nsIDocShellTreeItem> shellItem = do_QueryInterface(docShell);
    shellItem->GetItemType(&itemType);
    if (itemType == nsIDocShellTreeItem::typeChrome)
      focusDocument = PR_FALSE;
    else {
      // Check for a frameset document
      focusDocument = !(IsFrameSetDoc(docShell));
    }

    if (!forward && !docHasFocus && focusDocument) {
#ifdef DEBUG_DOCSHELL_FOCUS
      printf("Focusing document\n");
#endif
      SetContentState(nsnull, NS_EVENT_STATE_FOCUS);
      docShell->SetHasFocus(PR_TRUE);
      docShell->SetCanvasHasFocus(PR_TRUE);
    } else {
      // If there's nothing left to focus in this document,
      // pop out to our parent document, and have it shift focus
      // in the same direction starting at the content element
      // corresponding to our docshell.
      
      nsCOMPtr<nsIDocShellTreeItem> treeItem = do_QueryInterface(pcContainer);
      nsCOMPtr<nsIDocShellTreeItem> treeParent;
      treeItem->GetParent(getter_AddRefs(treeParent));
      if (treeParent) {
        nsCOMPtr<nsIDocShell> parentDS = do_QueryInterface(treeParent);
        if (parentDS) {
          nsCOMPtr<nsIPresShell> parentShell;
          parentDS->GetPresShell(getter_AddRefs(parentShell));
          
          nsCOMPtr<nsIContent> shellContent;
          parentShell->FindContentForShell(docShell, getter_AddRefs(shellContent));
          
          nsCOMPtr<nsIPresContext> parentPC;
          parentShell->GetPresContext(getter_AddRefs(parentPC));
          
          nsCOMPtr<nsIEventStateManager> parentESM;
          parentPC->GetEventStateManager(getter_AddRefs(parentESM));
          
          SetContentState(nsnull, NS_EVENT_STATE_FOCUS);

#ifdef DEBUG_DOCSHELL_FOCUS
          printf("popping out focus to parent docshell\n");
#endif

          parentESM->ShiftFocus(forward, shellContent);
        }
      } else {
        PRBool tookFocus = PR_FALSE;
        nsCOMPtr<nsIDocShell> subShell = do_QueryInterface(pcContainer);
        if (subShell)
          subShell->TabToTreeOwner(forward, &tookFocus);
        
#ifdef DEBUG_DOCSHEL_FOCUS
        printf("offered focus to tree owner, tookFocus=%d\n",
               tookFocus);
#endif

        if (tookFocus) {
          SetContentState(nsnull, NS_EVENT_STATE_FOCUS);
          docShell->SetHasFocus(PR_FALSE);
        } else {
          // there is nowhere else to send the focus, so
          // refocus ourself.

#ifdef DEBUG_DOCSHELL_FOCUS
          printf("wrapping around within this document\n");
#endif

          NS_IF_RELEASE(mCurrentFocus);
          docShell->SetHasFocus(PR_FALSE);
          ShiftFocus(forward);
        }
      }
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::GetNextTabbableContent(nsIContent* aRootContent, nsIFrame* aFrame, PRBool forward,
                                            nsIContent** aResult)
{
  *aResult = nsnull;
  PRBool keepFirstFrame = PR_FALSE;
  PRBool findLastFrame = PR_FALSE;

  nsCOMPtr<nsIBidirectionalEnumerator> frameTraversal;

  if (!aFrame) {
    //No frame means we need to start with the root content again.
    nsCOMPtr<nsIPresShell> presShell;
    if (mPresContext) {
      nsIFrame* result = nsnull;
      if (NS_SUCCEEDED(mPresContext->GetShell(getter_AddRefs(presShell))) && presShell) {
        presShell->GetPrimaryFrameFor(aRootContent, &result);
      }

      aFrame = result;

      if (!forward)
        findLastFrame = PR_TRUE;
    }
    if (!aFrame) {
      return NS_ERROR_FAILURE;
    }
    keepFirstFrame = PR_TRUE;
  }

  //Need to do special check in case we're in an imagemap which has multiple content per frame
  if (mCurrentFocus) {
    nsCOMPtr<nsIAtom> tag;
    mCurrentFocus->GetTag(*getter_AddRefs(tag));
    if(nsHTMLAtoms::area==tag.get()) {
      //Focus is in an imagemap area
      nsCOMPtr<nsIPresShell> presShell;
      if (mPresContext) {
        nsIFrame* result = nsnull;
        if (NS_SUCCEEDED(mPresContext->GetShell(getter_AddRefs(presShell))) && presShell) {
          presShell->GetPrimaryFrameFor(mCurrentFocus, &result);
        }
        if (result == aFrame) {
          //The current focus map area is in the current frame, don't skip over it.
          keepFirstFrame = PR_TRUE;
        }
      }
    }
  }

  nsresult result;
  nsCOMPtr<nsIFrameTraversal> trav(do_CreateInstance(kFrameTraversalCID,&result));
  if (NS_FAILED(result))
    return result;

  result = trav->NewFrameTraversal(getter_AddRefs(frameTraversal), FOCUS,
                                   mPresContext, aFrame);
  if (NS_FAILED(result))
    return NS_OK;

  if (!keepFirstFrame) {
    if (forward)
      frameTraversal->Next();
    else frameTraversal->Prev();
  } else if (findLastFrame)
    frameTraversal->Last();

  nsISupports* currentItem;
  frameTraversal->CurrentItem(&currentItem);
  nsIFrame* currentFrame = (nsIFrame*)currentItem;

  while (currentFrame) {
    nsCOMPtr<nsIContent> child;
    currentFrame->GetContent(getter_AddRefs(child));

    const nsStyleVisibility* vis;
    currentFrame->GetStyleData(eStyleStruct_Visibility, ((const nsStyleStruct *&)vis));

    const nsStyleUserInterface* ui;
    currentFrame->GetStyleData(eStyleStruct_UserInterface, ((const nsStyleStruct*&)ui));

    PRBool viewShown = PR_TRUE;

    nsIView* frameView = nsnull;
    currentFrame->GetView(mPresContext, &frameView);
    if (!frameView) {
      nsIFrame* parentWithView = nsnull;
      currentFrame->GetParentWithView(mPresContext, &parentWithView);
      if (parentWithView)
        parentWithView->GetView(mPresContext, &frameView);
    }
    while (frameView) {
      nsViewVisibility visib;
      frameView->GetVisibility(visib);
      if (visib == nsViewVisibility_kHide) {
        viewShown = PR_FALSE;
        break;
      }
      frameView->GetParent(frameView);
    }

    nsCOMPtr<nsIDOMElement> element(do_QueryInterface(child));

    // if collapsed or hidden, we don't get tabbed into.
    if (viewShown &&
        (vis->mVisible != NS_STYLE_VISIBILITY_COLLAPSE) &&
        (vis->mVisible != NS_STYLE_VISIBILITY_HIDDEN) && 
        (ui->mUserFocus != NS_STYLE_USER_FOCUS_IGNORE) &&
        (ui->mUserFocus != NS_STYLE_USER_FOCUS_NONE) && element) {
      nsCOMPtr<nsIAtom> tag;
      PRInt32 tabIndex = -1;
      PRBool disabled = PR_TRUE;
      PRBool hidden = PR_FALSE;

      child->GetTag(*getter_AddRefs(tag));
      nsCOMPtr<nsIDOMHTMLElement> htmlElement(do_QueryInterface(child));
      if (htmlElement) {
        if (nsHTMLAtoms::input==tag.get()) {
          nsCOMPtr<nsIDOMHTMLInputElement> nextInput(do_QueryInterface(child));
          if (nextInput) {
            nextInput->GetDisabled(&disabled);
            nextInput->GetTabIndex(&tabIndex);

            nsAutoString type;
            nextInput->GetType(type);
            if (type.EqualsIgnoreCase("hidden")) {
              hidden = PR_TRUE;
            }
          }
        }
        else if (nsHTMLAtoms::select==tag.get()) {
          nsCOMPtr<nsIDOMHTMLSelectElement> nextSelect(do_QueryInterface(child));
          if (nextSelect) {
            nextSelect->GetDisabled(&disabled);
            nextSelect->GetTabIndex(&tabIndex);
          }
        }
        else if (nsHTMLAtoms::textarea==tag.get()) {
          nsCOMPtr<nsIDOMHTMLTextAreaElement> nextTextArea(do_QueryInterface(child));
          if (nextTextArea) {
            nextTextArea->GetDisabled(&disabled);
            nextTextArea->GetTabIndex(&tabIndex);
          }
        }
        else if(nsHTMLAtoms::a==tag.get()) {
          nsCOMPtr<nsIDOMHTMLAnchorElement> nextAnchor(do_QueryInterface(child));
          if (nextAnchor)
            nextAnchor->GetTabIndex(&tabIndex);
          nsAutoString href;
          nextAnchor->GetAttribute(NS_LITERAL_STRING("href"), href);
          if (!href.Length()) {
            disabled = PR_TRUE; // Don't tab unless href, bug 17605
          } else {
            disabled = PR_FALSE;
          }
        }
        else if(nsHTMLAtoms::button==tag.get()) {
          nsCOMPtr<nsIDOMHTMLButtonElement> nextButton(do_QueryInterface(child));
          if (nextButton) {
            nextButton->GetTabIndex(&tabIndex);
            nextButton->GetDisabled(&disabled);
          }
        }
        else if(nsHTMLAtoms::img==tag.get()) {
          nsCOMPtr<nsIDOMHTMLImageElement> nextImage(do_QueryInterface(child));
          nsAutoString usemap;
          if (nextImage) {
            nsCOMPtr<nsIDocument> doc;
            if (NS_SUCCEEDED(child->GetDocument(*getter_AddRefs(doc))) && doc) {
              nextImage->GetAttribute(NS_LITERAL_STRING("usemap"), usemap);
              nsCOMPtr<nsIDOMHTMLMapElement> imageMap;
              if (NS_SUCCEEDED(nsImageMapUtils::FindImageMap(doc,usemap,getter_AddRefs(imageMap))) && imageMap) {
                nsCOMPtr<nsIContent> map(do_QueryInterface(imageMap));
                if (map) {
                  nsCOMPtr<nsIContent> childArea;
                  PRInt32 count, index;
                  map->ChildCount(count);
                  //First see if mCurrentFocus is in this map
                  for (index = 0; index < count; index++) {
                    map->ChildAt(index, *getter_AddRefs(childArea));
                    if (childArea.get() == mCurrentFocus) {
                      nsAutoString tabIndexStr;
                      childArea->GetAttr(kNameSpaceID_None, nsHTMLAtoms::tabindex, tabIndexStr);
                      PRInt32 val = 0;
                      if (!tabIndexStr.IsEmpty()) {
                        PRInt32 ec, tabIndexVal = tabIndexStr.ToInteger(&ec);
                        if (NS_SUCCEEDED(ec)) {
                          val = tabIndexVal;
                        }
                      }
                      if (mCurrentTabIndex == val) {
                        //mCurrentFocus is in this map so we must start iterating past it.
                        //We skip the case where mCurrentFocus has the same tab index
                        //as mCurrentTabIndex since the next tab ordered element might
                        //be before it (or after for backwards) in the child list.
                        break;
                      }
                    }
                  }
                  PRInt32 increment = forward ? 1 : - 1;
                  PRInt32 start = index < count ? index + increment : (forward ? 0 : count - 1);
                  for (index = start; index < count && index >= 0; index += increment) {
                    //Iterate over the children.
                    map->ChildAt(index, *getter_AddRefs(childArea));

                    //Got the map area, check its tabindex.
                    nsAutoString tabIndexStr;
                    childArea->GetAttr(kNameSpaceID_None, nsHTMLAtoms::tabindex, tabIndexStr);
                    PRInt32 val = 0;
                    if (!tabIndexStr.IsEmpty()) {
                      PRInt32 ec, tabIndexVal = tabIndexStr.ToInteger(&ec);
                      if (NS_SUCCEEDED(ec)) {
                        val = tabIndexVal;
                      }
                    }
                    if (mCurrentTabIndex == val) {
                      //tabindex == the current one, use it.
                      *aResult = childArea;
                      NS_IF_ADDREF(*aResult);
                      return NS_OK;
                    }
                  }
                }
              }
            }
          }
        }
        else if(nsHTMLAtoms::object==tag.get()) {
          nsCOMPtr<nsIDOMHTMLObjectElement> nextObject(do_QueryInterface(child));
          if (nextObject) 
            nextObject->GetTabIndex(&tabIndex);
          disabled = PR_FALSE;
        }
        else if (nsHTMLAtoms::iframe==tag.get()) {
          disabled = PR_FALSE;
        } 
        else if (nsHTMLAtoms::frame==tag.get()) {
          disabled = PR_FALSE;
        }
      }
      else {
        nsAutoString value;
        child->GetAttr(kNameSpaceID_None, nsHTMLAtoms::disabled, value);
        nsAutoString tabStr;
        child->GetAttr(kNameSpaceID_None, nsHTMLAtoms::tabindex, tabStr);
        if (!tabStr.IsEmpty()) {
          PRInt32 errorCode;
          tabIndex = tabStr.ToInteger(&errorCode);
        }
        if (!value.Equals(NS_LITERAL_STRING("true")))
          disabled = PR_FALSE;
      }
      
      //TabIndex not set (-1) treated at same level as set to 0
      tabIndex = tabIndex < 0 ? 0 : tabIndex;

      if (!disabled && !hidden && mCurrentTabIndex == tabIndex && child.get() != mCurrentFocus) {
        *aResult = child;
        NS_IF_ADDREF(*aResult);
        return NS_OK;
      }
    }

    if (forward)
      frameTraversal->Next();
    else frameTraversal->Prev();

    frameTraversal->CurrentItem(&currentItem);
    currentFrame = (nsIFrame*)currentItem;
  }

  // Reached end or beginning of document
  //If already at lowest priority tab (0), end
  if (((forward) && (0 == mCurrentTabIndex)) ||
      ((!forward) && (1 == mCurrentTabIndex))) {
    return NS_OK;
  }
  //else continue looking for next highest priority tab
  mCurrentTabIndex = GetNextTabIndex(aRootContent, forward);
  return GetNextTabbableContent(aRootContent, nsnull, forward, aResult);
}

PRInt32
nsEventStateManager::GetNextTabIndex(nsIContent* aParent, PRBool forward)
{
  PRInt32 count, tabIndex, childTabIndex;
  nsCOMPtr<nsIContent> child;
  
  aParent->ChildCount(count);
 
  if (forward) {
    tabIndex = 0;
    for (PRInt32 index = 0; index < count; index++) {
      aParent->ChildAt(index, *getter_AddRefs(child));
      childTabIndex = GetNextTabIndex(child, forward);
      if (childTabIndex > mCurrentTabIndex && childTabIndex != tabIndex) {
        tabIndex = (tabIndex == 0 || childTabIndex < tabIndex) ? childTabIndex : tabIndex; 
      }
      
      nsAutoString tabIndexStr;
      child->GetAttr(kNameSpaceID_None, nsHTMLAtoms::tabindex, tabIndexStr);
      PRInt32 ec, val = tabIndexStr.ToInteger(&ec);
      if (NS_OK == ec && val > mCurrentTabIndex && val != tabIndex) {
        tabIndex = (tabIndex == 0 || val < tabIndex) ? val : tabIndex; 
      }
    }
  } 
  else { /* !forward */
    tabIndex = 1;
    for (PRInt32 index = 0; index < count; index++) {
      aParent->ChildAt(index, *getter_AddRefs(child));
      childTabIndex = GetNextTabIndex(child, forward);
      if ((mCurrentTabIndex==0 && childTabIndex > tabIndex) ||
          (childTabIndex < mCurrentTabIndex && childTabIndex > tabIndex)) {
        tabIndex = childTabIndex;
      }
      
      nsAutoString tabIndexStr;
      child->GetAttr(kNameSpaceID_None, nsHTMLAtoms::tabindex, tabIndexStr);
      PRInt32 ec, val = tabIndexStr.ToInteger(&ec);
      if (NS_OK == ec) {
        if ((mCurrentTabIndex==0 && val > tabIndex) ||
            (val < mCurrentTabIndex && val > tabIndex) ) {
          tabIndex = val;
        }
      }
    }
  }
  return tabIndex;
}

NS_IMETHODIMP
nsEventStateManager::GetEventTarget(nsIFrame **aFrame)
{
  if (!mCurrentTarget && mCurrentTargetContent) {
    nsCOMPtr<nsIPresShell> shell;
    if (mPresContext) {
      nsresult rv = mPresContext->GetShell(getter_AddRefs(shell));
      if (NS_SUCCEEDED(rv) && shell){
        shell->GetPrimaryFrameFor(mCurrentTargetContent, &mCurrentTarget);
      }
    }
  }

  if (!mCurrentTarget) {
	  nsCOMPtr<nsIPresShell> presShell;
	  mPresContext->GetShell(getter_AddRefs(presShell));
	  if (presShell) {
	    presShell->GetEventTargetFrame(&mCurrentTarget);
	  }
  }

  *aFrame = mCurrentTarget;
  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::GetEventTargetContent(nsEvent* aEvent, nsIContent** aContent)
{
  if (aEvent &&
      (aEvent->message == NS_FOCUS_CONTENT ||
       aEvent->message == NS_BLUR_CONTENT)) {
    *aContent = mCurrentFocus;
    NS_IF_ADDREF(*aContent);
    return NS_OK;
  }

  if (mCurrentTargetContent) {
    *aContent = mCurrentTargetContent;
    NS_IF_ADDREF(*aContent);
    return NS_OK;
  }

  if (!mCurrentTarget) {
	  nsCOMPtr<nsIPresShell> presShell;
	  mPresContext->GetShell(getter_AddRefs(presShell));
	  if (presShell) {
	    presShell->GetEventTargetFrame(&mCurrentTarget);
	  }
  }

  if (mCurrentTarget) {
    mCurrentTarget->GetContentForEvent(mPresContext, aEvent, aContent);
    return NS_OK;
  }

  *aContent = nsnull;
  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::GetEventRelatedContent(nsIContent** aContent)
{
  if (mCurrentRelatedContent) {
    *aContent = mCurrentRelatedContent;
    NS_IF_ADDREF(*aContent);
    return NS_OK;      
  }
  
  *aContent = nsnull;
  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::GetContentState(nsIContent *aContent, PRInt32& aState)
{
  aState = NS_EVENT_STATE_UNSPECIFIED;

  if (aContent == mActiveContent) {
    aState |= NS_EVENT_STATE_ACTIVE;
  }
  if (hHover) {
    //If using hierchical hover check the ancestor chain of mHoverContent
    //to see if we are on it.
    nsCOMPtr<nsIContent> parent = mHoverContent;
    nsIContent* child;
    while (parent) {
	    if (aContent == parent.get()) {
	      aState |= NS_EVENT_STATE_HOVER;
        break;
	    }
      child = parent;
      child->GetParent(*getter_AddRefs(parent));
    }
  }
  else {
    if (aContent == mHoverContent) {
      aState |= NS_EVENT_STATE_HOVER;
    }
  }

  if (aContent == mCurrentFocus) {
    aState |= NS_EVENT_STATE_FOCUS;
  }
  if (aContent == mDragOverContent) {
    aState |= NS_EVENT_STATE_DRAGOVER;
  }
  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::SetContentState(nsIContent *aContent, PRInt32 aState)
{
  const PRInt32 maxNotify = 5;
  nsIContent  *notifyContent[maxNotify] = {nsnull, nsnull, nsnull, nsnull, nsnull};

  // check to see that this state is allowed by style. Check dragover too?
  if (mCurrentTarget && (aState == NS_EVENT_STATE_ACTIVE || aState == NS_EVENT_STATE_HOVER))
  {
    const nsStyleUserInterface* ui;
    mCurrentTarget->GetStyleData(eStyleStruct_UserInterface, ((const nsStyleStruct*&)ui));
    if (ui->mUserInput == NS_STYLE_USER_INPUT_NONE)
      return NS_OK;
  }
  
  if ((aState & NS_EVENT_STATE_DRAGOVER) && (aContent != mDragOverContent)) {
    //transferring ref to notifyContent from mDragOverContent
    notifyContent[4] = mDragOverContent; // notify dragover first, since more common case
    mDragOverContent = aContent;
    NS_IF_ADDREF(mDragOverContent);
  }

  if ((aState & NS_EVENT_STATE_ACTIVE) && (aContent != mActiveContent)) {
    //transferring ref to notifyContent from mActiveContent
    notifyContent[2] = mActiveContent;
    mActiveContent = aContent;
    NS_IF_ADDREF(mActiveContent);
  }

  nsCOMPtr<nsIContent> newHover = nsnull;
  nsCOMPtr<nsIContent> oldHover = nsnull;
  nsCOMPtr<nsIContent> commonHoverParent = nsnull;
  if ((aState & NS_EVENT_STATE_HOVER) && (aContent != mHoverContent)) {
    if (hHover) {
      nsCOMPtr<nsIDocument> doc;
      if (aContent && NS_SUCCEEDED(aContent->GetDocument(*getter_AddRefs(doc))) && doc) {
        newHover = aContent;
      }
      if (mHoverContent && NS_SUCCEEDED(mHoverContent->GetDocument(*getter_AddRefs(doc))) && doc) {
        oldHover = mHoverContent;
      }

      //Find closest common parent
      nsCOMPtr<nsIContent> parent1 = mHoverContent;
      nsCOMPtr<nsIContent> parent2;
      if (mHoverContent && aContent) {
        while (parent1) {
          parent2 = aContent;
          while (parent2) {
	          if (parent1 == parent2) {
              commonHoverParent = parent1;
              break;
            }
            nsIContent* child2 = parent2;
            child2->GetParent(*getter_AddRefs(parent2));
	        }
          if (commonHoverParent) {
            break;
          }
          nsIContent* child1 = parent1;
          child1->GetParent(*getter_AddRefs(parent1));
        }
      }
      //If new hover content is null we get the top parent of mHoverContent
      else if (mHoverContent) {
        nsCOMPtr<nsIContent> parent = mHoverContent;
        nsIContent* child = nsnull;
        while (parent) {
          child = parent;
          child->GetParent(*getter_AddRefs(parent));
        }
        commonHoverParent = child;
      }
      //Else if old hover content is null we get the top parent of aContent
      else {
        nsCOMPtr<nsIContent> parent = aContent;
        nsIContent* child = nsnull;
        while (parent) {
          child = parent;
          child->GetParent(*getter_AddRefs(parent));
        }
        commonHoverParent = child;
      }
      NS_IF_RELEASE(mHoverContent);
    }
    else {
      //transferring ref to notifyContent from mHoverContent
      notifyContent[1] = mHoverContent; // notify hover first, since more common case
    }
    mHoverContent = aContent;
    NS_IF_ADDREF(mHoverContent);
  }

  if ((aState & NS_EVENT_STATE_FOCUS)) {
    if (aContent && (aContent == mCurrentFocus) && gLastFocusedDocument == mDocument) {
      // gLastFocusedDocument appears to always be correct, that is why
      // I'm not setting it here. This is to catch an edge case.
      NS_IF_RELEASE(gLastFocusedContent);
      gLastFocusedContent = mCurrentFocus;
      NS_IF_ADDREF(gLastFocusedContent);
      //If this notification was for focus alone then get rid of aContent
      //ref to avoid unnecessary notification.
      if (!(aState & ~NS_EVENT_STATE_FOCUS)) {
        aContent = nsnull;
      }
    } else {
      notifyContent[3] = gLastFocusedContent;
      NS_IF_ADDREF(gLastFocusedContent);
      SendFocusBlur(mPresContext, aContent);
    }
  }

  if (aContent) { // notify about new content too
    notifyContent[0] = aContent;
    NS_ADDREF(aContent);  // everything in notify array has a ref
  }

  // remove duplicates
  if ((notifyContent[4] == notifyContent[3]) || (notifyContent[4] == notifyContent[2]) || (notifyContent[4] == notifyContent[1])) {
    NS_IF_RELEASE(notifyContent[4]);
  }
  // remove duplicates
  if ((notifyContent[3] == notifyContent[2]) || (notifyContent[3] == notifyContent[1])) {
    NS_IF_RELEASE(notifyContent[3]);
  }
  if (notifyContent[2] == notifyContent[1]) {
    NS_IF_RELEASE(notifyContent[2]);
  }

  // remove notifications for content not in document.
  // we may decide this is possible later but right now it has problems.
  nsIDocument* doc = nsnull;
  for  (int i = 0; i < maxNotify; i++) {
    if (notifyContent[i] && NS_SUCCEEDED(notifyContent[i]->GetDocument(doc)) && !doc) {
      NS_RELEASE(notifyContent[i]);
    }
    NS_IF_RELEASE(doc);
  }

  // compress the notify array to group notifications tighter
  nsIContent** from = &(notifyContent[0]);
  nsIContent** to   = &(notifyContent[0]);
  nsIContent** end  = &(notifyContent[maxNotify]);

  while (from < end) {
    if (! *from) {
      while (++from < end) {
        if (*from) {
          *to++ = *from;
          *from = nsnull;
          break;
        }
      }
    }
    else {
      if (from == to) {
        to++;
        from++;
      }
      else {
        *to++ = *from;
        *from++ = nsnull;
      }
    }
  }

  if (notifyContent[0] || newHover || oldHover) { // have at least one to notify about
    nsCOMPtr<nsIDocument> doc1, doc2;  // this presumes content can't get/lose state if not connected to doc
    if (notifyContent[0]) {
      notifyContent[0]->GetDocument(*getter_AddRefs(doc1));
      if (notifyContent[1]) {
        //For :focus this might be a different doc so check
        notifyContent[1]->GetDocument(*getter_AddRefs(doc2));
        if (doc1 == doc2) {
          doc2 = nsnull;
        }
      }
    }
    else if (newHover) {
      newHover->GetDocument(*getter_AddRefs(doc1));
    }
    else {
      oldHover->GetDocument(*getter_AddRefs(doc2));
    }
    if (doc1) {
      doc1->BeginUpdate();

      //Notify all content from newHover to the commonHoverParent
      if (newHover) {
        nsCOMPtr<nsIContent> parent;
        newHover->GetParent(*getter_AddRefs(parent));
        doc1->ContentStatesChanged(newHover, parent);
        while (parent && parent != commonHoverParent) {
          parent->GetParent(*getter_AddRefs(newHover));
          if (newHover && newHover != commonHoverParent) {
            newHover->GetParent(*getter_AddRefs(parent));
            if (parent == commonHoverParent) {
              doc1->ContentStatesChanged(newHover, nsnull);
            }
            else {
              doc1->ContentStatesChanged(newHover, parent);
            }
          }
          else {
            break;
          }
        }
      }
      //Notify all content from oldHover to the commonHoverParent
      if (oldHover) {
        nsCOMPtr<nsIContent> parent;
        oldHover->GetParent(*getter_AddRefs(parent));
        doc1->ContentStatesChanged(oldHover, parent);
        while (parent && parent != commonHoverParent) {
          parent->GetParent(*getter_AddRefs(oldHover));
          if (oldHover && oldHover != commonHoverParent) {
            oldHover->GetParent(*getter_AddRefs(parent));
            if (parent == commonHoverParent) {
              doc1->ContentStatesChanged(oldHover, nsnull);
            }
            else {
              doc1->ContentStatesChanged(oldHover, parent);
            }
          }
          else {
            break;
          }
        }
      }

      doc1->ContentStatesChanged(notifyContent[0], notifyContent[1]);
      if (notifyContent[2]) {  // more that two notifications are needed (should be rare)
        // XXX a further optimization here would be to group the notification pairs
        // together by parent/child, only needed if more than two content changed
        // (ie: if [0] and [2] are parent/child, then notify (0,2) (1,3))
        doc1->ContentStatesChanged(notifyContent[2], notifyContent[3]);
        if (notifyContent[4]) {  // more that two notifications are needed (should be rare)
          doc1->ContentStatesChanged(notifyContent[4], nsnull);
        }
      }
      doc1->EndUpdate();

      if (doc2) {
        doc2->BeginUpdate();
        doc2->ContentStatesChanged(notifyContent[1], notifyContent[2]);
        if (notifyContent[3]) {
          doc1->ContentStatesChanged(notifyContent[3], notifyContent[4]);
        }
        doc2->EndUpdate();
      }
    }

    from = &(notifyContent[0]);
    while (from < to) {  // release old refs now that we are through
      nsIContent* notify = *from++;
      NS_RELEASE(notify);
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::SendFocusBlur(nsIPresContext* aPresContext, nsIContent *aContent)
{
  nsCOMPtr<nsIPresShell> presShell;
  aPresContext->GetShell(getter_AddRefs(presShell));
  
  if (nsnull != gLastFocusedPresContext) {
    
    if (gLastFocusedContent && gLastFocusedContent != mFirstBlurEvent) {

      //Store the first blur event we fire and don't refire blur
      //to that element while the first blur is still ongoing.
      PRBool clearFirstBlurEvent = PR_FALSE;
      if (!mFirstBlurEvent) {
        mFirstBlurEvent = gLastFocusedContent;
        NS_ADDREF(mFirstBlurEvent);
        clearFirstBlurEvent = PR_TRUE;
      }

      // Retrieve this content node's pres context. it can be out of sync in
      // the Ender widget case.
      nsCOMPtr<nsIDocument> doc;
      gLastFocusedContent->GetDocument(*getter_AddRefs(doc));
      if (doc) {
        // The order of the nsIViewManager and nsIPresShell COM pointers is
        // important below.  We want the pres shell to get released before the
        // associated view manager on exit from this function.
        // See bug 53763.
        nsCOMPtr<nsIViewManager> kungFuDeathGrip;
        nsCOMPtr<nsIPresShell> shell;
        doc->GetShellAt(0, getter_AddRefs(shell));
        if (shell) {
          shell->GetViewManager(getter_AddRefs(kungFuDeathGrip));

          nsCOMPtr<nsIPresContext> oldPresContext;
          shell->GetPresContext(getter_AddRefs(oldPresContext));

          //fire blur
          nsEventStatus status = nsEventStatus_eIgnore;
          nsEvent event;
          event.eventStructType = NS_EVENT;
          event.message = NS_BLUR_CONTENT;
          
          EnsureDocument(presShell);
          
          // Make sure we're not switching command dispatchers, if so, surpress the blurred one
          if(gLastFocusedDocument && mDocument) {
            nsCOMPtr<nsIFocusController> newFocusController;
            nsCOMPtr<nsIFocusController> oldFocusController;
            nsCOMPtr<nsPIDOMWindow> oldPIDOMWindow;
            nsCOMPtr<nsPIDOMWindow> newPIDOMWindow;
            nsCOMPtr<nsIScriptGlobalObject> oldGlobal;
            nsCOMPtr<nsIScriptGlobalObject> newGlobal;
            gLastFocusedDocument->GetScriptGlobalObject(getter_AddRefs(oldGlobal));
            mDocument->GetScriptGlobalObject(getter_AddRefs(newGlobal));
            nsCOMPtr<nsPIDOMWindow> newWindow = do_QueryInterface(newGlobal);
            nsCOMPtr<nsPIDOMWindow> oldWindow = do_QueryInterface(oldGlobal);
            if(newWindow)
              newWindow->GetRootFocusController(getter_AddRefs(newFocusController));
            if(oldWindow)
			  oldWindow->GetRootFocusController(getter_AddRefs(oldFocusController));
            if(oldFocusController && oldFocusController != newFocusController)
              oldFocusController->SetSuppressFocus(PR_TRUE, "SendFocusBlur Window Switch");
          }
          
          nsCOMPtr<nsIEventStateManager> esm;
          oldPresContext->GetEventStateManager(getter_AddRefs(esm));
          esm->SetFocusedContent(gLastFocusedContent);
          nsCOMPtr<nsIContent> temp = gLastFocusedContent;
          NS_RELEASE(gLastFocusedContent);
          gLastFocusedContent = nsnull;
          temp->HandleDOMEvent(oldPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 
          esm->SetFocusedContent(nsnull);
        }
      }

      if (clearFirstBlurEvent) {
        NS_RELEASE(mFirstBlurEvent);
      }
    }

    // Go ahead and fire a blur on the window.
    nsCOMPtr<nsIScriptGlobalObject> globalObject;

    if(gLastFocusedDocument)
      gLastFocusedDocument->GetScriptGlobalObject(getter_AddRefs(globalObject));

    EnsureDocument(presShell);

    if (gLastFocusedDocument && (gLastFocusedDocument != mDocument) && globalObject) {  
      nsEventStatus status = nsEventStatus_eIgnore;
      nsEvent event;
      event.eventStructType = NS_EVENT;
      event.message = NS_BLUR_CONTENT;

	  	  // Make sure we're not switching command dispatchers, if so, surpress the blurred one
		  if(mDocument) {
		    nsCOMPtr<nsIFocusController> newFocusController;
            nsCOMPtr<nsIFocusController> oldFocusController;
		    nsCOMPtr<nsPIDOMWindow> oldPIDOMWindow;
		    nsCOMPtr<nsPIDOMWindow> newPIDOMWindow;
		    nsCOMPtr<nsIScriptGlobalObject> oldGlobal;
		    nsCOMPtr<nsIScriptGlobalObject> newGlobal;
		    gLastFocusedDocument->GetScriptGlobalObject(getter_AddRefs(oldGlobal));
		    mDocument->GetScriptGlobalObject(getter_AddRefs(newGlobal));
            nsCOMPtr<nsPIDOMWindow> newWindow = do_QueryInterface(newGlobal);
		    nsCOMPtr<nsPIDOMWindow> oldWindow = do_QueryInterface(oldGlobal);

        if (newWindow)
          newWindow->GetRootFocusController(getter_AddRefs(newFocusController));
		    oldWindow->GetRootFocusController(getter_AddRefs(oldFocusController));
            if(oldFocusController && oldFocusController != newFocusController)
			  oldFocusController->SetSuppressFocus(PR_TRUE, "SendFocusBlur Window Switch #2");
		  }

      nsCOMPtr<nsIEventStateManager> esm;
      gLastFocusedPresContext->GetEventStateManager(getter_AddRefs(esm));
      esm->SetFocusedContent(nsnull);
      nsCOMPtr<nsIDocument> temp = gLastFocusedDocument;
      NS_RELEASE(gLastFocusedDocument);
      gLastFocusedDocument = nsnull;
      temp->HandleDOMEvent(gLastFocusedPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
      globalObject->HandleDOMEvent(gLastFocusedPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status); 
    }
  }
  
  NS_IF_RELEASE(gLastFocusedContent);
  NS_IF_RELEASE(mCurrentFocus);
  gLastFocusedContent = aContent;
  mCurrentFocus = aContent;
  NS_IF_ADDREF(aContent);
  NS_IF_ADDREF(aContent);
 
  if (nsnull != aContent && aContent != mFirstFocusEvent) {

    //Store the first focus event we fire and don't refire focus
    //to that element while the first focus is still ongoing.
    PRBool clearFirstFocusEvent = PR_FALSE;
    if (!mFirstFocusEvent) {
      mFirstFocusEvent = aContent;
      NS_ADDREF(mFirstFocusEvent);
      clearFirstFocusEvent = PR_TRUE;
    }

    //fire focus
    nsEventStatus status = nsEventStatus_eIgnore;
    nsEvent event;
    event.eventStructType = NS_EVENT;
    event.message = NS_FOCUS_CONTENT;

    if (nsnull != mPresContext) {
      aContent->HandleDOMEvent(mPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
    }
    
    nsAutoString tabIndex;
    aContent->GetAttr(kNameSpaceID_None, nsHTMLAtoms::tabindex, tabIndex);
    PRInt32 ec, val = tabIndex.ToInteger(&ec);
    if (NS_OK == ec) {
      mCurrentTabIndex = val;
    }

    if (clearFirstFocusEvent) {
      NS_RELEASE(mFirstFocusEvent);
	}
  } else if (!aContent) {
    //fire focus on document even if the content isn't focusable (ie. text)
    //see bugzilla bug 93521
    nsEventStatus status = nsEventStatus_eIgnore;
    nsEvent event;
    event.eventStructType = NS_EVENT;
    event.message = NS_FOCUS_CONTENT;
    if (nsnull != mPresContext && mDocument) {
      mDocument->HandleDOMEvent(mPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, &status);
    }
  }

  nsIFrame * currentFocusFrame = nsnull;
  if (mCurrentFocus)
    presShell->GetPrimaryFrameFor(mCurrentFocus, &currentFocusFrame);
  if (!currentFocusFrame)
    currentFocusFrame = mCurrentTarget;

  // Find the window that this frame is in and
  // make sure it has focus
  if (currentFocusFrame) {
    nsIFrame * parentFrame;
    currentFocusFrame->GetParentWithView(aPresContext, &parentFrame);
    if (nsnull != parentFrame) {
      nsIView * pView;
      parentFrame->GetView(aPresContext, &pView);
      if (nsnull != pView) {
        nsIWidget *window = nsnull;

        nsIView *ancestor = pView;
        while (nsnull != ancestor) {
          ancestor->GetWidget(window); // addrefs
          if (nsnull != window) {
              window->SetFocus();
              NS_RELEASE(window); // releases. Duh.
	          break;
	        }
	        ancestor->GetParent(ancestor);
        }
      }
    }
  }

  // For accessibility.browsewithcaret option, we must make the caret visible in text nodes
  if (presShell && mBrowseWithCaret) 
    EnsureCaretVisible(presShell, aContent);

  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::GetFocusedContent(nsIContent** aContent)
{
  *aContent = mCurrentFocus;
  NS_IF_ADDREF(*aContent);
  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::SetFocusedContent(nsIContent* aContent)
{
  NS_IF_RELEASE(mCurrentFocus);
  mCurrentFocus = aContent;
  NS_IF_ADDREF(mCurrentFocus);
  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::ContentRemoved(nsIContent* aContent)
{
  if (aContent == mCurrentFocus) {
    // Note that we don't use SetContentState() here because
    // we don't want to fire a blur.  Blurs should only be fired
    // in response to clicks or tabbing.

    NS_RELEASE(mCurrentFocus);
  }

  return NS_OK;
}


//-------------------------------------------
// Access Key Registration
//-------------------------------------------
NS_IMETHODIMP
nsEventStateManager::RegisterAccessKey(nsIFrame * aFrame, nsIContent* aContent, PRUint32 aKey)
{
  if (!mAccessKeys) {
    mAccessKeys = new nsSupportsHashtable();
    if (!mAccessKeys) {
      return NS_ERROR_FAILURE;
    }
  }

  nsCOMPtr<nsIContent> content;
  if (!aContent) {
    aFrame->GetContent(getter_AddRefs(content));
  }
  else {
    content = aContent;
  }

  if (content) {
    nsAutoString accKey((char)aKey);
    ToLowerCase(accKey);

    nsVoidKey key((void*)accKey.First());

    mAccessKeys->Put(&key, content);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsEventStateManager::UnregisterAccessKey(nsIFrame * aFrame, nsIContent* aContent, PRUint32 aKey)
{
  if (!mAccessKeys) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsIContent> content;
  if (!aContent) {
    aFrame->GetContent(getter_AddRefs(content));
  }
  else {
    content = aContent;
  }
  if (content) {
    nsAutoString accKey((char)aKey);
    ToLowerCase(accKey);

    nsVoidKey key((void*)accKey.First());

    nsCOMPtr<nsIContent> oldContent = getter_AddRefs(NS_STATIC_CAST(nsIContent*, mAccessKeys->Get(&key)));
    if (oldContent != content) {
      return NS_OK;
    }
    mAccessKeys->Remove(&key);
  }
  return NS_OK;
}

void nsEventStateManager::ForceViewUpdate(nsIView* aView)
{
  // force the update to happen now, otherwise multiple scrolls can
  // occur before the update is processed. (bug #7354)

  nsIViewManager* vm = nsnull;
  if (NS_OK == aView->GetViewManager(vm) && nsnull != vm) {
    // I'd use Composite here, but it doesn't always work.
    // vm->Composite();
    vm->ForceUpdate();
    NS_RELEASE(vm);
  }
}

NS_IMETHODIMP
nsEventStateManager::DispatchNewEvent(nsISupports* aTarget, nsIDOMEvent* aEvent, PRBool *aPreventDefault)
{
  nsresult ret = NS_OK;

  nsCOMPtr<nsIPrivateDOMEvent> privEvt(do_QueryInterface(aEvent));
  if (aEvent) {
    nsCOMPtr<nsIDOMEventTarget> eventTarget(do_QueryInterface(aTarget));
    privEvt->SetTarget(eventTarget);

    //Key and mouse events have additional security to prevent event spoofing
    nsEvent * internalEvent;
    privEvt->GetInternalNSEvent(&internalEvent);
    if (internalEvent && (internalEvent->eventStructType == NS_KEY_EVENT ||
        internalEvent->eventStructType == NS_MOUSE_EVENT)) {
      //Check security state to determine if dispatcher is trusted
      nsCOMPtr<nsIScriptSecurityManager>
      securityManager(do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID));
      NS_ENSURE_TRUE(securityManager, NS_ERROR_FAILURE);

      PRBool enabled;
      nsresult res = securityManager->IsCapabilityEnabled("UniversalBrowserWrite", &enabled);
      if (NS_SUCCEEDED(res) && enabled) {
        privEvt->SetTrusted(PR_TRUE);
      }
      else {
        privEvt->SetTrusted(PR_FALSE);
      } 
    }
    else {
      privEvt->SetTrusted(PR_TRUE);
    }

    nsEvent* innerEvent;
    privEvt->GetInternalNSEvent(&innerEvent);
    if (innerEvent) {
      nsEventStatus status = nsEventStatus_eIgnore;
      nsCOMPtr<nsIScriptGlobalObject> target(do_QueryInterface(aTarget));
      if (target) {
        ret = target->HandleDOMEvent(mPresContext, innerEvent, &aEvent, NS_EVENT_FLAG_INIT, &status);
      }
      else {
        nsCOMPtr<nsIDocument> target(do_QueryInterface(aTarget));
        if (target) {
          ret = target->HandleDOMEvent(mPresContext, innerEvent, &aEvent, NS_EVENT_FLAG_INIT, &status);
        }
        else {
          nsCOMPtr<nsIContent> target(do_QueryInterface(aTarget));
          if (target) {
            ret = target->HandleDOMEvent(mPresContext, innerEvent, &aEvent, NS_EVENT_FLAG_INIT, &status);
          }
          else {
            nsCOMPtr<nsIChromeEventHandler> target(do_QueryInterface(aTarget));
            if (target) {
              ret = target->HandleChromeEvent(mPresContext, innerEvent, &aEvent, NS_EVENT_FLAG_INIT, &status);
            }
          }
        }
      }

      *aPreventDefault = status == nsEventStatus_eConsumeNoDefault ? PR_FALSE : PR_TRUE;
    }
  }

  return ret;
}

void nsEventStateManager::EnsureDocument(nsIPresContext* aPresContext) {
  if (!mDocument) {
    nsCOMPtr<nsIPresShell> presShell;
    aPresContext->GetShell(getter_AddRefs(presShell));
    EnsureDocument(presShell);
  }
}

void nsEventStateManager::EnsureDocument(nsIPresShell* aPresShell) {
  if (!mDocument && aPresShell)
    aPresShell->GetDocument(&mDocument);
}

void nsEventStateManager::FlushPendingEvents(nsIPresContext* aPresContext) {
  NS_PRECONDITION(nsnull != aPresContext, "nsnull ptr");
  nsCOMPtr<nsIPresShell> shell;
  aPresContext->GetShell(getter_AddRefs(shell));
  if (nsnull != shell) {
    shell->FlushPendingNotifications(PR_FALSE);
    nsCOMPtr<nsIViewManager> viewManager;
    shell->GetViewManager(getter_AddRefs(viewManager));
    if (viewManager) {
      viewManager->FlushPendingInvalidates();
    }
  }
}

nsresult NS_NewEventStateManager(nsIEventStateManager** aInstancePtrResult)
{
  nsresult rv;

  NS_PRECONDITION(nsnull != aInstancePtrResult, "nsnull ptr");
  if (nsnull == aInstancePtrResult) {
    return NS_ERROR_NULL_POINTER;
  }
  nsIEventStateManager* manager = new nsEventStateManager();
  if (nsnull == manager) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  rv =  manager->QueryInterface(NS_GET_IID(nsIEventStateManager),
                                 (void **) aInstancePtrResult);
  if (NS_FAILED(rv)) return rv;

  return manager->Init();
}


nsresult nsEventStateManager::GetCaretLocation(nsIContent **aCaretContent,
    nsIFrame **aCaretFrame, PRUint32* aCaretOffset)
{
  // In order to return the nsIContent and nsIFrame of the caret's position,
  // we need to get a pres shell, and then get the selection from it

  *aCaretFrame = nsnull; 
  *aCaretContent = nsnull;
  nsresult rv = NS_ERROR_FAILURE;
  
  nsCOMPtr<nsIPresShell> shell;
  if (mPresContext)
    rv = mPresContext->GetShell(getter_AddRefs(shell));

  nsCOMPtr<nsIFrameSelection> selectionFrame;
  if (shell) 
    rv = shell->GetFrameSelection(getter_AddRefs(selectionFrame));

  nsCOMPtr<nsISelection> domSelection;
  if (selectionFrame)
    rv = selectionFrame->GetSelection(nsISelectionController::SELECTION_NORMAL,
      getter_AddRefs(domSelection));

  nsCOMPtr<nsIDOMNode> focusDomNode;
  if (domSelection) {
    rv = domSelection->GetAnchorNode(getter_AddRefs(focusDomNode));
    typedef PRInt32* PRInt32_ptr;
    domSelection->GetAnchorOffset(PRInt32_ptr(aCaretOffset));
    }

  nsCOMPtr<nsIContent> selectionContent(do_QueryInterface(focusDomNode));

  nsIFrame *primaryFrame = nsnull;
  if (selectionContent) 
    rv = shell->GetPrimaryFrameFor(selectionContent, &primaryFrame);

  *aCaretFrame = primaryFrame;
  *aCaretContent = selectionContent;
  NS_IF_ADDREF(*aCaretContent);

  return rv;
}


nsresult nsEventStateManager::MoveFocusToCaret()
{
  // mBrowseWithCaret equals the pref accessibility.browsewithcaret
  // When it's true, the user can arrow around the browser as if it's a
  // read only text editor.
  // If they cursor over a focusable element, then send focus to it
  nsCOMPtr<nsIContent> caretContent;
  nsIFrame *caretFrame;
  PRUint32 caretOffset;
  nsresult rv = GetCaretLocation(getter_AddRefs(caretContent),
    &caretFrame, &caretOffset);

  if (caretContent) {
    // First check to see if our caret is at the very end of a node
    // If so, the caret is actually sitting in front of the next
    // logical frame's primary node - so for this case we need to
    // change caretContent to that node.
    nsCOMPtr<nsIContent> origCaretContent(caretContent);
    nsAutoString nodeValue;
    nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(caretContent));
    domNode->GetNodeValue(nodeValue);

    if (nodeValue.Length() == caretOffset) {
      // Yes, indeed we were at the end of the last node
      nsCOMPtr<nsIBidirectionalEnumerator> frameTraversal;

      nsCOMPtr<nsIFrameTraversal> trav(do_CreateInstance(kFrameTraversalCID,
                                                         &rv));
      NS_ENSURE_SUCCESS(rv, rv);

      rv = trav->NewFrameTraversal(getter_AddRefs(frameTraversal), EXTENSIVE,
                                   mPresContext, caretFrame);
      NS_ENSURE_SUCCESS(rv, rv);

      do {   
        // Get the next logical frame, and set the start of
        // focusable elements. Search for focusable elements from there.
        // Continue getting next frame until the primary node for the frame
        // we are on changes - we don't want to be stuck in the same place
        frameTraversal->Next();
        nsISupports* currentItem;
        frameTraversal->CurrentItem(&currentItem);
        caretFrame = NS_STATIC_CAST(nsIFrame*, currentItem);
        if (caretFrame)
          caretFrame->GetContent(getter_AddRefs(caretContent));
        else break;
      }
      while (caretContent && caretContent == origCaretContent);
    }

    // We now have the correct start node in caretContent!
    // Search for focusable elements, starting with caretContent
    // Keep going up while we look - an ancestory might be focusable

    // jst: We could end the loop earlier, such as when we're no longer
    // in the same frame, by comparing getPrimaryFrameFor(caretContent)
    // with a variable holding the starting caretContent
    nsCOMPtr<nsIAtom> tag;
    while (caretContent && NS_SUCCEEDED(rv)) {
      // Keep testing while caretContent is equal to something,
      // eventually we'll run out of ancestors

      domNode = do_QueryInterface(caretContent);
      if (!domNode) 
        break;

      domNode->GetNodeValue(nodeValue);
      caretContent->GetTag(*getter_AddRefs(tag));
      if (caretContent.get() == mCurrentFocus)
        break;  // already focused on this node, this whole thing's moot

      // For now, all we're going to focus on during this move by
      // cursor is ordinary links
      // Add more focusable tags here later if necessary ... 
      if (nsHTMLAtoms::a == tag.get()) {
        // We are on a link, so change focus to it.
        ChangeFocus(caretContent);
        break;
      }
      // Get the parent
      nsIContent* parent;
      caretContent->GetParent(parent);
      caretContent = dont_AddRef(parent);
    }
  }
  return NS_OK;
}



nsresult nsEventStateManager::MoveCaretToFocus()
{
  // If in HTML content and the pref accessibility.browsewithcaret is TRUE,
  // then always move the caret to beginning of a new focus

  if (mBrowseWithCaret && mPresContext) {
    nsCOMPtr<nsIPresShell> shell;
    mPresContext->GetShell(getter_AddRefs(shell));
    if (shell) {
      // rangeDoc is a document interface we can create a range with
      nsCOMPtr<nsIDOMDocumentRange> rangeDoc(do_QueryInterface(mDocument));
      nsCOMPtr<nsIDOMNode> currentFocusNode(do_QueryInterface(mCurrentFocus));
      nsCOMPtr<nsIFrameSelection> frameSelection;
      shell->GetFrameSelection(getter_AddRefs(frameSelection));
      nsCOMPtr<nsIFormControl> formControl(do_QueryInterface(currentFocusNode));

      if (frameSelection && currentFocusNode && rangeDoc && !formControl) {
        nsCOMPtr<nsISelection> domSelection;
        frameSelection->GetSelection(nsISelectionController::SELECTION_NORMAL, 
          getter_AddRefs(domSelection));
        if (domSelection) {
          // First clear the selection
          domSelection->RemoveAllRanges();
          nsCOMPtr<nsIDOMRange> newRange;
          nsresult rv = rangeDoc->CreateRange(getter_AddRefs(newRange));
          if (NS_SUCCEEDED(rv)) {
            // If we could create a new range, then set it to the current focus node
            // And then collapse the selection
            newRange->SelectNodeContents(currentFocusNode);
            domSelection->AddRange(newRange);
            domSelection->CollapseToStart();
          }
        }
      }
    }
  }
  return NS_OK;
}


nsresult nsEventStateManager::EnsureCaretVisible(nsIPresShell* aPresShell, nsIContent *aContent)
{ 
  // When browsing with caret, make sure caret is visible after new focus
  nsCOMPtr<nsIFrameSelection> frameSelection;
  aPresShell->GetFrameSelection(getter_AddRefs(frameSelection));
  nsCOMPtr<nsICaret> caret;
  aPresShell->GetCaret(getter_AddRefs(caret));

  if (frameSelection && caret) {
    nsCOMPtr<nsISelection> domSelection;
    frameSelection->GetSelection(nsISelectionController::SELECTION_NORMAL,
      getter_AddRefs(domSelection));

    if (domSelection) {
      nsCOMPtr<nsIDOMNode> focusDomNode;
      domSelection->GetAnchorNode(getter_AddRefs(focusDomNode));
      // first, tell the caret which selection to use
      if (!aContent) {
        caret->SetCaretDOMSelection(domSelection);
        // otherwise, aContent == nsnull, so item is focusable
        // in that case, let focus handlers take care of setting the caret's dom selection
      }
      nsCOMPtr<nsISelectionController> selCon(do_QueryInterface(aPresShell));
      if (!selCon)
        return NS_ERROR_NO_INTERFACE;
      selCon->SetCaretEnabled(PR_TRUE);
      caret->SetCaretVisible(PR_TRUE);

      PRInt32 pixelWidth = 1;
      nsCOMPtr<nsILookAndFeel> lookNFeel(do_GetService(kLookAndFeelCID));
      if (lookNFeel)
        lookNFeel->GetMetric(nsILookAndFeel::eMetric_MultiLineCaretWidth, pixelWidth);
      caret->SetCaretWidth(pixelWidth);
    }
  }
  return NS_OK;
}

//--------------------------------------------------------------------------------
//-- DocShell Focus Traversal Methods
//--------------------------------------------------------------------------------

//----------------------------------------
// Returns PR_TRUE if this doc contains a frameset
PRBool
nsEventStateManager::IsFrameSetDoc(nsIDocShell* aDocShell)
{
  NS_ASSERTION(aDocShell, "docshell is null");
  PRBool isFrameSet = PR_FALSE;

  // a frameset element will always be the immediate child
  // of the root content (the HTML tag)
  nsCOMPtr<nsIPresShell> presShell;
  aDocShell->GetPresShell(getter_AddRefs(presShell));
  if (presShell) {
    nsCOMPtr<nsIDocument> doc;
    presShell->GetDocument(getter_AddRefs(doc));
    nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(doc);
    if (htmlDoc) {
      nsCOMPtr<nsIContent> rootContent;
      doc->GetRootContent(getter_AddRefs(rootContent));
      if (rootContent) {
        PRInt32 childCount;
        rootContent->ChildCount(childCount);
        for (PRInt32 i = 0; i < childCount; ++i) {
          nsCOMPtr<nsIContent> childContent;
          rootContent->ChildAt(i, *getter_AddRefs(childContent));
          nsCOMPtr<nsIAtom> childTag;
          childContent->GetTag(*getter_AddRefs(childTag));
          if (childTag == nsHTMLAtoms::frameset) {
            isFrameSet = PR_TRUE;
            break;
          }
        }
      }
    }
  }

  return isFrameSet;
}

//----------------------------------------
// Returns PR_TRUE if this doc is an IFRAME

PRBool
nsEventStateManager::IsIFrameDoc(nsIDocShell* aDocShell)
{
  NS_ASSERTION(aDocShell, "docshell is null");
  nsCOMPtr<nsIDocShellTreeItem> treeItem = do_QueryInterface(aDocShell);
  nsCOMPtr<nsIDocShellTreeItem> parentItem;
  treeItem->GetParent(getter_AddRefs(parentItem));
  if (!parentItem)
    return PR_FALSE;
  
  nsCOMPtr<nsIDocShell> parentDS = do_QueryInterface(parentItem);
  nsCOMPtr<nsIPresShell> parentShell;
  parentDS->GetPresShell(getter_AddRefs(parentShell));
  NS_ASSERTION(parentShell, "presshell is null");
  
  nsCOMPtr<nsIContent> docContent;
  parentShell->FindContentForShell(aDocShell, getter_AddRefs(docContent));
  if (!docContent)
    return PR_FALSE;
  
  nsCOMPtr<nsIAtom> tag;
  docContent->GetTag(*getter_AddRefs(tag));
  return (tag == nsHTMLAtoms::iframe);
}

//-------------------------------------------------------
// Return PR_TRUE if the docshell is visible

PRBool
nsEventStateManager::IsShellVisible(nsIDocShell* aShell)
{
  NS_ASSERTION(aShell, "docshell is null");

  nsCOMPtr<nsIBaseWindow> basewin = do_QueryInterface(aShell);
  if (!basewin)
    return PR_TRUE;
  
  PRBool isVisible = PR_TRUE;
  basewin->GetVisibility(&isVisible);

  // We should be doing some additional checks here so that
  // we don't tab into hidden tabs of tabbrowser.  -bryner

  return isVisible;
}

//------------------------------------------------
// This method should be called when tab or F6/ctrl-tab
// traversal wants to focus a new document.  It will focus
// the docshell, traverse into the document if this type 
// of document does not get document focus (i.e. framsets 
// and chrome), and update the canvas focus state on the docshell.

void
nsEventStateManager::TabIntoDocument(nsIDocShell* aDocShell,
                                     PRBool aForward)
{
  NS_ASSERTION(aDocShell, "null docshell");
  nsCOMPtr<nsIDOMWindowInternal> domwin = do_GetInterface(aDocShell);
  if (domwin)
    domwin->Focus();

  PRInt32 itemType;
  nsCOMPtr<nsIDocShellTreeItem> treeItem = do_QueryInterface(aDocShell);
  treeItem->GetItemType(&itemType);

  PRBool focusDocument;
  if (!aForward || (itemType == nsIDocShellTreeItem::typeChrome))
    focusDocument = PR_FALSE;
  else {
    // Check for a frameset document
    focusDocument = !(IsFrameSetDoc(aDocShell));
  }

  if (focusDocument) {
    // make sure we're in view
    aDocShell->SetCanvasHasFocus(PR_TRUE);
  }
  else {
    aDocShell->SetHasFocus(PR_FALSE);

    nsCOMPtr<nsIPresContext> pc;
    aDocShell->GetPresContext(getter_AddRefs(pc));
    if (pc) {
      nsCOMPtr<nsIEventStateManager> docESM;
      pc->GetEventStateManager(getter_AddRefs(docESM));
      if (docESM) {
        // clear out any existing focus state
        docESM->SetContentState(nsnull, NS_EVENT_STATE_FOCUS);
        // now focus the first (or last) focusable content
        docESM->ShiftFocus(aForward, nsnull);
      }
    }
  }
}

void
nsEventStateManager::GetLastChildDocShell(nsIDocShellTreeItem* aItem,
                                          nsIDocShellTreeItem** aResult)
{
  NS_ASSERTION(aItem, "null docshell");
  NS_ASSERTION(aResult, "null out pointer");
  
  nsCOMPtr<nsIDocShellTreeItem> curItem = do_QueryInterface(aItem);
  while (1) {
    nsCOMPtr<nsIDocShellTreeNode> curNode = do_QueryInterface(curItem);
    PRInt32 childCount = 0;
    curNode->GetChildCount(&childCount);
    if (!childCount) {
      *aResult = curItem;
      NS_ADDREF(*aResult);
      return;
    }
    
    curNode->GetChildAt(childCount - 1, getter_AddRefs(curItem));
  }
}

void
nsEventStateManager::GetNextDocShell(nsIDocShellTreeNode* aNode,
                                     nsIDocShellTreeItem** aResult)
{
  NS_ASSERTION(aNode, "null docshell");
  NS_ASSERTION(aResult, "null out pointer");
  
  aNode->GetChildAt(0, aResult);
  if (*aResult)
    return;
  
  nsCOMPtr<nsIDocShellTreeNode> curNode = aNode;
  while (curNode) {
    nsCOMPtr<nsIDocShellTreeItem> curItem = do_QueryInterface(curNode);
    nsCOMPtr<nsIDocShellTreeItem> parentItem;
    curItem->GetParent(getter_AddRefs(parentItem));
    if (!parentItem) {
      *aResult = nsnull;
      return;
    }
    
    PRInt32 childOffset = 0;
    curItem->GetChildOffset(&childOffset);
    nsCOMPtr<nsIDocShellTreeNode> parentNode = do_QueryInterface(parentItem);
    parentNode->GetChildAt(childOffset+1, aResult);
    if (*aResult)
      return;
    
    curNode = do_QueryInterface(parentItem);
  }
}

void
nsEventStateManager::GetPrevDocShell(nsIDocShellTreeNode* aNode,
                                     nsIDocShellTreeItem** aResult)
{
  NS_ASSERTION(aNode, "null docshell");
  NS_ASSERTION(aResult, "null out pointer");
  
  nsCOMPtr<nsIDocShellTreeNode> curNode = aNode;
  nsCOMPtr<nsIDocShellTreeItem> curItem = do_QueryInterface(curNode);
  nsCOMPtr<nsIDocShellTreeItem> parentItem;

  curItem->GetParent(getter_AddRefs(parentItem));
  if (!parentItem) {
    *aResult = nsnull;
    return;
  }
  
  PRInt32 childOffset = 0;
  curItem->GetChildOffset(&childOffset);
  if (childOffset) {
    nsCOMPtr<nsIDocShellTreeNode> parentNode = do_QueryInterface(parentItem);
    parentNode->GetChildAt(childOffset - 1, getter_AddRefs(curItem));
    
    // get the last child recursively of this node
    while (1) {
      PRInt32 childCount = 0;
      curNode = do_QueryInterface(curItem);
      curNode->GetChildCount(&childCount);
      if (!childCount)
        break;
      
      curNode->GetChildAt(childCount - 1, getter_AddRefs(curItem));
    }
    
    *aResult = curItem;
    NS_ADDREF(*aResult);
    return;
  }
  
  *aResult = parentItem;
  NS_ADDREF(*aResult);
  return;
}

//-------------------------------------------------
// Traversal by document/DocShell only
// this does not include any content inside the doc
// or IFrames
void
nsEventStateManager::ShiftFocusByDoc(PRBool aForward)
{
  // Note that we use the docshell tree here instead of iteratively calling
  // ShiftFocus.  The docshell tree should be kept in depth-first frame tree
  // order, the same as we use for tabbing, so the effect should be the same,
  // but this is much faster.
  
  NS_ASSERTION(mPresContext, "no prescontext");

  nsCOMPtr<nsISupports> pcContainer;
  mPresContext->GetContainer(getter_AddRefs(pcContainer));
  nsCOMPtr<nsIDocShellTreeNode> curNode = do_QueryInterface(pcContainer);
  
  // perform a depth first search (preorder) of the docshell tree
  // looking for an HTML Frame or a chrome document
  
  nsCOMPtr<nsIDocShellTreeItem> nextItem;
  nsCOMPtr<nsIDocShell> nextShell;
  do {
    if (aForward) {
      GetNextDocShell(curNode, getter_AddRefs(nextItem));
      if (!nextItem) {
        nsCOMPtr<nsIDocShellTreeItem> curItem = do_QueryInterface(pcContainer);
        // wrap around to the beginning, which is the top of the tree
        curItem->GetRootTreeItem(getter_AddRefs(nextItem));
      }
    }
    else {
      GetPrevDocShell(curNode, getter_AddRefs(nextItem));
      if (!nextItem) {
        nsCOMPtr<nsIDocShellTreeItem> curItem = do_QueryInterface(pcContainer);
        // wrap around to the end, which is the last node in the tree
        nsCOMPtr<nsIDocShellTreeItem> rootItem;
        curItem->GetRootTreeItem(getter_AddRefs(rootItem));
        GetLastChildDocShell(rootItem, getter_AddRefs(nextItem));
      }
    }

    curNode = do_QueryInterface(nextItem);
    nextShell = do_QueryInterface(nextItem);
  } while (IsFrameSetDoc(nextShell) || IsIFrameDoc(nextShell) || !IsShellVisible(nextShell));

  if (nextShell) {
    // NOTE: always tab forward into the document, this ensures that we
    // focus the document itself, not its last focusable content.
    // chrome documents will get their first focusable content focused.
    SetContentState(nsnull, NS_EVENT_STATE_FOCUS);
    TabIntoDocument(nextShell, PR_TRUE);
  }
}