path: root/embed/mozilla/EphyWrapper.cpp

/*
 *  Copyright (C) 2000 Marco Pesenti Gritti
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "EphyWrapper.h"
#include "GlobalHistory.h"
#include "ProgressListener.h"
#include "ephy-embed.h"
#include "ephy-string.h"

#include <gtkmozembed_internal.h>
#include <unistd.h>

#include "nsIContentViewer.h"
#include "nsIGlobalHistory.h"
#include "nsIDocShellHistory.h"
#include "nsIWebBrowserFind.h"
#include "nsIWebBrowserFocus.h"
#include "nsIDocument.h"
#include "nsISHEntry.h"
#include "nsISHistoryInternal.h"
#include "nsIHistoryEntry.h"
#include "nsIWebBrowserPrint.h"
#include "nsIURI.h"
#include "nsIMarkupDocumentViewer.h"
#include "nsIComponentManager.h"
#include "nsIScriptGlobalObject.h"
#include "nsIDOMWindowInternal.h"
#include "nsIInterfaceRequestor.h"
#include "nsIFocusController.h"
#include "nsIWebBrowserPersist.h"
#include "nsCWebBrowserPersist.h"
#include "nsNetUtil.h"
#include "nsIChromeEventHandler.h"
#include "nsIClipboardCommands.h"
#include "nsIDOMDocumentStyle.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeNode.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIHTMLContentContainer.h"
#include "nsICSSLoader.h"
#include "nsICSSStyleSheet.h"
#include "nsICSSLoaderObserver.h"
#include "nsIStyleSet.h"
#include "nsIDocumentObserver.h"
#include "nsCWebBrowser.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsIDOMNSHTMLDocument.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLCollection.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDeviceContext.h"
#include "nsIPresContext.h"
#include "ContentHandler.h"
#include "EphyEventListener.h"

EphyWrapper::EphyWrapper ()
{
    mEventListener = nsnull;
    mEventReceiver = nsnull;    
}

EphyWrapper::~EphyWrapper ()
{
}

nsresult EphyWrapper::Init (GtkMozEmbed *mozembed)
{
    nsresult result;

    gtk_moz_embed_get_nsIWebBrowser (mozembed,
                     getter_AddRefs(mWebBrowser));
    if (!mWebBrowser) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDocShell> DocShell;
    result = GetDocShell (getter_AddRefs(DocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDocShellHistory> dsHistory = do_QueryInterface (DocShell);
    if (!dsHistory) return NS_ERROR_FAILURE;

    mEventListener = new EphyEventListener();
    mEventListener->Init (EPHY_EMBED (mozembed));
    GetListener();
    AttachListeners();

    nsCOMPtr<nsIGlobalHistory> inst =  
    do_GetService(NS_GLOBALHISTORY_CONTRACTID, &result);

    return dsHistory->SetGlobalHistory(inst);
}

nsresult
EphyWrapper::GetListener (void)
{
    if (mEventReceiver) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMWindow> domWindowExternal;
    mWebBrowser->GetContentDOMWindow(getter_AddRefs(domWindowExternal));
  
    nsCOMPtr<nsIDOMWindowInternal> domWindow;
        domWindow = do_QueryInterface(domWindowExternal);
    
    nsCOMPtr<nsPIDOMWindow> piWin(do_QueryInterface(domWindow));
    if (!piWin) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIChromeEventHandler> chromeHandler;
    piWin->GetChromeEventHandler(getter_AddRefs(chromeHandler));

    mEventReceiver = do_QueryInterface(chromeHandler);
    if (!mEventReceiver) return NS_ERROR_FAILURE;

    return NS_OK;
}

nsresult
EphyWrapper::AttachListeners(void)
{
    if (!mEventReceiver) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMEventTarget> target;
    target = do_QueryInterface (mEventReceiver);

    return target->AddEventListener(NS_LITERAL_STRING("DOMLinkAdded"),
                            mEventListener, PR_FALSE);
}

nsresult
EphyWrapper::DetachListeners(void)
{
    if (!mEventReceiver) return NS_ERROR_FAILURE;
    
    nsCOMPtr<nsIDOMEventTarget> target;
    target = do_QueryInterface (mEventReceiver);

    return target->RemoveEventListener(NS_LITERAL_STRING("DOMLinkAdded"),
                       mEventListener, PR_FALSE);
}

nsresult EphyWrapper::GetDocShell (nsIDocShell **aDocShell)
{
        nsCOMPtr<nsIDocShellTreeItem> browserAsItem;
        browserAsItem = do_QueryInterface(mWebBrowser);
        if (!browserAsItem) return NS_ERROR_FAILURE;

        // get the owner for that item
        nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
        browserAsItem->GetTreeOwner(getter_AddRefs(treeOwner));
        if (!treeOwner) return NS_ERROR_FAILURE;

        // get the primary content shell as an item
        nsCOMPtr<nsIDocShellTreeItem> contentItem;
        treeOwner->GetPrimaryContentShell(getter_AddRefs(contentItem));
        if (!contentItem) return NS_ERROR_FAILURE;

        // QI that back to a docshell
        nsCOMPtr<nsIDocShell> DocShell;
        DocShell = do_QueryInterface(contentItem);
        if (!DocShell) return NS_ERROR_FAILURE;

        *aDocShell = DocShell.get();

        NS_IF_ADDREF(*aDocShell);
        
        return NS_OK;
}
nsresult EphyWrapper::Print (nsIPrintSettings *options, PRBool preview)
{
    nsresult result;

    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser, &result));
    if (NS_FAILED(result) || !print) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMWindow> DOMWindow;
    result = mWebBrowser->GetContentDOMWindow (getter_AddRefs(DOMWindow));
    if (NS_FAILED(result) || !DOMWindow) return NS_ERROR_FAILURE;

    if (!preview)
    {
        result = print->Print (options, nsnull);
    }
    else
    {
        result = print->PrintPreview(options, nsnull, nsnull);
    }

    return result;
}

nsresult EphyWrapper::PrintPreviewClose (void)
{
    nsresult rv;
    PRBool isPreview = PR_FALSE;

    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser, &rv));
    if (NS_FAILED(rv) || !print) return NS_ERROR_FAILURE;

    rv = print->GetDoingPrintPreview(&isPreview);
    if (NS_SUCCEEDED (rv) && isPreview == PR_TRUE)
    {
        rv = print->ExitPrintPreview();
    }

    return rv;
}

nsresult EphyWrapper::PrintPreviewNumPages (int *numPages)
{
    nsresult rv;

    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser, &rv));
    if (NS_FAILED(rv) || !print) return NS_ERROR_FAILURE;

    rv = print->GetPrintPreviewNumPages(numPages);
    return rv;
}

nsresult EphyWrapper::PrintPreviewNavigate(PRInt16 navType, PRInt32 pageNum)
{
    nsresult rv;

    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser, &rv));
    if (NS_FAILED(rv) || !print) return NS_ERROR_FAILURE;

    rv = print->PrintPreviewNavigate(navType, pageNum);
    return rv;
}

nsresult EphyWrapper::GetPrintSettings (nsIPrintSettings **options)
{
    nsresult result;
    nsCOMPtr<nsIWebBrowserPrint> print(do_GetInterface(mWebBrowser, &result));
    if (NS_FAILED(result) || !print) return NS_ERROR_FAILURE;

    return print->GetGlobalPrintSettings(options);
}

nsresult EphyWrapper::GetSHistory (nsISHistory **aSHistory)
{
    nsresult result;

    nsCOMPtr<nsIDocShell> DocShell;
    result = GetDocShell (getter_AddRefs(DocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIWebNavigation> ContentNav = do_QueryInterface (DocShell,
                                   &result);
    if (!ContentNav) return NS_ERROR_FAILURE;

    nsCOMPtr<nsISHistory> SessionHistory;
    result = ContentNav->GetSessionHistory (getter_AddRefs (SessionHistory));
    if (!SessionHistory) return NS_ERROR_FAILURE;

    *aSHistory = SessionHistory.get();
    NS_IF_ADDREF (*aSHistory);

    return NS_OK;
}

nsresult EphyWrapper::Destroy ()
{
    DetachListeners ();

        mWebBrowser = nsnull;
    mChromeNav = nsnull;
    
    return NS_OK;
}

nsresult EphyWrapper::GoToHistoryIndex (PRInt16 index)
{
    nsresult result;

    nsCOMPtr<nsIDocShell> DocShell;
    result = GetDocShell (getter_AddRefs(DocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIWebNavigation> ContentNav = do_QueryInterface (DocShell,
                                   &result);
    if (!ContentNav) return NS_ERROR_FAILURE;

    return  ContentNav->GotoIndex (index);
}

nsresult EphyWrapper::SetZoom (float aZoom, PRBool reflow)
{
    nsresult result;

    nsCOMPtr<nsIDocShell> DocShell;
    result = GetDocShell (getter_AddRefs(DocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    if (reflow)
    {
        nsCOMPtr<nsIContentViewer> contentViewer;   
        result = DocShell->GetContentViewer (getter_AddRefs(contentViewer));
        if (!NS_SUCCEEDED (result) || !contentViewer) return NS_ERROR_FAILURE;

        nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(contentViewer,
                                  &result);
        if (NS_FAILED(result) || !mdv) return NS_ERROR_FAILURE;

        return mdv->SetTextZoom (aZoom);
    }
    else
    {
        SetZoomOnDocshell (aZoom, DocShell);

        nsCOMPtr<nsIDocShellTreeNode> docShellNode(do_QueryInterface(DocShell));
        if (docShellNode)
        {
            PRInt32 i;
            PRInt32 n;
            docShellNode->GetChildCount(&n);
            for (i=0; i < n; i++) 
            {
                nsCOMPtr<nsIDocShellTreeItem> child;
                docShellNode->GetChildAt(i, getter_AddRefs(child));
                nsCOMPtr<nsIDocShell> childAsShell(do_QueryInterface(child));
                if (childAsShell) 
                {
                    return SetZoomOnDocshell (aZoom, childAsShell);
                }
            }
        }
    }

    return NS_OK;
}

nsresult EphyWrapper::SetZoomOnDocshell (float aZoom, nsIDocShell *DocShell)
{
    nsresult result;

    nsCOMPtr<nsIPresContext> PresContext;
    result = DocShell->GetPresContext (getter_AddRefs(PresContext));
    if (NS_FAILED(result) || !PresContext) return NS_ERROR_FAILURE;
                    
    nsCOMPtr<nsIDeviceContext> DeviceContext;
    result = PresContext->GetDeviceContext (getter_AddRefs(DeviceContext));
    if (NS_FAILED(result) || !DeviceContext) return NS_ERROR_FAILURE;

    return DeviceContext->SetTextZoom (aZoom);
}

nsresult EphyWrapper::GetZoom (float *aZoom)
{
    nsresult result;

    nsCOMPtr<nsIDocShell> DocShell;
    result = GetDocShell (getter_AddRefs(DocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIContentViewer> contentViewer;   
    result = DocShell->GetContentViewer (getter_AddRefs(contentViewer));
    if (!NS_SUCCEEDED (result) || !contentViewer) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(contentViewer,
                                  &result);
    if (NS_FAILED(result) || !mdv) return NS_ERROR_FAILURE;

    return mdv->GetTextZoom (aZoom);
}

nsresult EphyWrapper::GetFocusedDOMWindow (nsIDOMWindow **aDOMWindow)
{
    nsresult rv;
    
    nsCOMPtr<nsIWebBrowserFocus> focus = do_GetInterface(mWebBrowser, &rv);
    if (NS_FAILED(rv) || !focus) return NS_ERROR_FAILURE;

    rv = focus->GetFocusedWindow (aDOMWindow);
    if (NS_FAILED(rv))
        rv = mWebBrowser->GetContentDOMWindow (aDOMWindow);
    return rv;
}

nsresult EphyWrapper::GetDOMWindow (nsIDOMWindow **aDOMWindow)
{
    nsresult rv;
    
    rv = mWebBrowser->GetContentDOMWindow (aDOMWindow);
    
    return rv;
}

nsresult EphyWrapper::GetDOMDocument (nsIDOMDocument **aDOMDocument)
{
    nsresult result;

    /* Use the current target document */
    if (mTargetDocument)
    {
        *aDOMDocument = mTargetDocument.get();

        NS_IF_ADDREF(*aDOMDocument);

        return NS_OK;
    }

    /* Use the focused document */
    nsCOMPtr<nsIDOMWindow> DOMWindow;
    result = GetFocusedDOMWindow (getter_AddRefs(DOMWindow));
    if (NS_SUCCEEDED(result) && DOMWindow)
    {
        return DOMWindow->GetDocument (aDOMDocument);
    }

    /* Use the main document */
    return GetMainDOMDocument (aDOMDocument);
}

nsresult EphyWrapper::GetMainDOMDocument (nsIDOMDocument **aDOMDocument)
{
    nsresult result;

    nsCOMPtr<nsIDocShell> DocShell;
    result = GetDocShell (getter_AddRefs(DocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIContentViewer> contentViewer;   
    result = DocShell->GetContentViewer (getter_AddRefs(contentViewer));
    if (!NS_SUCCEEDED (result) || !contentViewer) return NS_ERROR_FAILURE;

    return contentViewer->GetDOMDocument (aDOMDocument);
}

nsresult EphyWrapper::GetSHInfo (PRInt32 *count, PRInt32 *index)
{
    nsresult result;

    nsCOMPtr<nsISHistory> SessionHistory;
    result = GetSHistory (getter_AddRefs(SessionHistory));
    if (NS_FAILED(result) || ! SessionHistory) return NS_ERROR_FAILURE;

    SessionHistory->GetCount (count);
    SessionHistory->GetIndex (index);   

    return NS_OK;
}

nsresult EphyWrapper::GetSHTitleAtIndex (PRInt32 index, PRUnichar **title)
{
    nsresult result;

    nsCOMPtr<nsISHistory> SessionHistory;
    result = GetSHistory (getter_AddRefs(SessionHistory));
    if (NS_FAILED(result) || ! SessionHistory) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIHistoryEntry> he;
    result = SessionHistory->GetEntryAtIndex (index, PR_FALSE,
                          getter_AddRefs (he));
    if (!NS_SUCCEEDED(result) || (!he)) return NS_ERROR_FAILURE;

    result = he->GetTitle (title);
    if (!NS_SUCCEEDED(result) || (!title)) return NS_ERROR_FAILURE;

    return NS_OK;
}

nsresult EphyWrapper::GetSHUrlAtIndex (PRInt32 index, nsCString &url)
{
    nsresult result;

    nsCOMPtr<nsISHistory> SessionHistory;
    result = GetSHistory (getter_AddRefs(SessionHistory));
    if (NS_FAILED(result) || ! SessionHistory) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIHistoryEntry> he;
    result = SessionHistory->GetEntryAtIndex (index, PR_FALSE,
                          getter_AddRefs (he));
    if (NS_FAILED(result) || (!he)) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIURI> uri;
    result = he->GetURI (getter_AddRefs(uri));
    if (NS_FAILED(result) || (!uri)) return NS_ERROR_FAILURE;

    result = uri->GetSpec(url);
    if (NS_FAILED(result) || url.IsEmpty()) return NS_ERROR_FAILURE;

    return NS_OK;
}

nsresult EphyWrapper::FindSetProperties (const PRUnichar *search_string,
                             PRBool case_sensitive,
                     PRBool wrap_around)
{
    nsCOMPtr<nsIWebBrowserFind> finder (do_GetInterface(mWebBrowser));
    
    finder->SetSearchString (search_string);
    finder->SetMatchCase (case_sensitive);
    finder->SetWrapFind (wrap_around);

    return NS_OK;
}

nsresult EphyWrapper::Find (PRBool backwards,
                PRBool *didFind)
{
    nsCOMPtr<nsIWebBrowserFind> finder (do_GetInterface(mWebBrowser));
    
    finder->SetFindBackwards (backwards);

    return finder->FindNext(didFind);
}

nsresult EphyWrapper::GetWebNavigation(nsIWebNavigation **aWebNavigation)
{
    nsresult result;

    nsCOMPtr<nsIDOMWindow> DOMWindow;
    result = GetFocusedDOMWindow (getter_AddRefs(DOMWindow));
    if (NS_FAILED(result) || !DOMWindow) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIScriptGlobalObject> scriptGlobal = do_QueryInterface(DOMWindow);
    if (!scriptGlobal) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDocShell> docshell;
    if (NS_FAILED(scriptGlobal->GetDocShell(getter_AddRefs(docshell))))
        return NS_ERROR_FAILURE;

    nsCOMPtr<nsIWebNavigation> wn = do_QueryInterface (docshell, &result);
    if (!wn || !NS_SUCCEEDED (result)) return NS_ERROR_FAILURE;

    NS_IF_ADDREF(*aWebNavigation = wn);
    return NS_OK;
}

nsresult EphyWrapper::LoadDocument(nsISupports *aPageDescriptor,
                     PRUint32 aDisplayType)
{
    nsresult rv;

    nsCOMPtr<nsIWebNavigation> wn;
    rv = GetWebNavigation(getter_AddRefs(wn));
    if (!wn || !NS_SUCCEEDED(rv)) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIWebPageDescriptor> wpd = do_QueryInterface(wn, &rv);
    if (!wpd || !NS_SUCCEEDED(rv)) return NS_ERROR_FAILURE;

    return wpd->LoadPage(aPageDescriptor, aDisplayType);
}

nsresult EphyWrapper::GetPageDescriptor(nsISupports **aPageDescriptor)
{
    nsresult rv;

    nsCOMPtr<nsIWebNavigation> wn;
    rv = GetWebNavigation(getter_AddRefs(wn));
    if (!wn || !NS_SUCCEEDED(rv)) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIWebPageDescriptor> wpd = do_QueryInterface(wn, &rv);
    if (!wpd || !NS_SUCCEEDED(rv)) return NS_ERROR_FAILURE;

    return wpd->GetCurrentDescriptor(aPageDescriptor);
}

nsresult EphyWrapper::GetMainDocumentUrl (nsCString &url)
{
    nsresult result;

    nsCOMPtr<nsIDOMDocument> DOMDocument;

    result = GetMainDOMDocument (getter_AddRefs(DOMDocument));
    if (NS_FAILED(result) || !DOMDocument) return NS_ERROR_FAILURE;

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

    nsCOMPtr<nsIURI> uri;
    doc->GetDocumentURL(getter_AddRefs(uri));

    return uri->GetSpec (url);
}

nsresult EphyWrapper::GetDocumentUrl (nsCString &url)
{
        nsresult result;

        nsCOMPtr<nsIDOMDocument> DOMDocument;

        result = GetDOMDocument (getter_AddRefs(DOMDocument));
        if (NS_FAILED(result) || !DOMDocument) return NS_ERROR_FAILURE;

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

        nsCOMPtr<nsIURI> uri;
        doc->GetDocumentURL(getter_AddRefs(uri));

        uri->GetSpec (url);

        return NS_OK;
}

nsresult  EphyWrapper::CopyHistoryTo (EphyWrapper *dest)
{
    nsresult result;
    int count,index;

    nsCOMPtr<nsIDocShell> DocShell;
    result = GetDocShell (getter_AddRefs(DocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIWebNavigation> wn_src = do_QueryInterface (DocShell,
                                   &result);
    if (!wn_src) return NS_ERROR_FAILURE;
    
    nsCOMPtr<nsISHistory> h_src;
    result = wn_src->GetSessionHistory (getter_AddRefs (h_src));
    if (!NS_SUCCEEDED(result) || (!h_src)) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDocShell> destDocShell;
    result = dest->GetDocShell (getter_AddRefs(destDocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIWebNavigation> wn_dest = do_QueryInterface (destDocShell,
                                &result);
    if (!wn_dest) return NS_ERROR_FAILURE;
    
    nsCOMPtr<nsISHistory> h_dest;
    result = wn_dest->GetSessionHistory (getter_AddRefs (h_dest));
    if (!NS_SUCCEEDED (result) || (!h_dest)) return NS_ERROR_FAILURE;

    nsCOMPtr<nsISHistoryInternal> hi_dest = do_QueryInterface (h_dest);
    if (!hi_dest) return NS_ERROR_FAILURE;

    h_src->GetCount (&count);
    h_src->GetIndex (&index);

    if (count) {
        nsCOMPtr<nsIHistoryEntry> he;
        nsCOMPtr<nsISHEntry> she;

        for (PRInt32 i = 0; i < count; i++) {

            result = h_src->GetEntryAtIndex (i, PR_FALSE,
                             getter_AddRefs (he));
            if (!NS_SUCCEEDED(result) || (!he))
                return NS_ERROR_FAILURE;

            she = do_QueryInterface (he);
            if (!she) return NS_ERROR_FAILURE;

            result = hi_dest->AddEntry (she, PR_TRUE);
            if (!NS_SUCCEEDED(result) || (!she))
                return NS_ERROR_FAILURE;
        }

        result = wn_dest->GotoIndex(index);
        if (!NS_SUCCEEDED(result)) return NS_ERROR_FAILURE;
    }

    return NS_OK;
}

nsresult EphyWrapper::ForceEncoding (const char *encoding) 
{
    nsresult result;

    nsCOMPtr<nsIDocShell> DocShell;
    result = GetDocShell (getter_AddRefs(DocShell));
    if (NS_FAILED(result) || !DocShell) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIContentViewer> contentViewer;   
    result = DocShell->GetContentViewer (getter_AddRefs(contentViewer));
    if (!NS_SUCCEEDED (result) || !contentViewer) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(contentViewer,
                                  &result);
    if (NS_FAILED(result) || !mdv) return NS_ERROR_FAILURE;

#if MOZILLA_SNAPSHOT > 8
    result = mdv->SetForceCharacterSet (nsDependentCString(encoding));
#else
    result = mdv->SetForceCharacterSet (NS_ConvertUTF8toUCS2(encoding).get());
#endif

    return result;
}

nsresult EphyWrapper::CanCutSelection(PRBool *result)
{
    nsCOMPtr<nsIClipboardCommands> clipboard (do_GetInterface(mWebBrowser));
    return clipboard->CanCutSelection (result);
}

nsresult EphyWrapper::CanCopySelection(PRBool *result)
{
    nsCOMPtr<nsIClipboardCommands> clipboard (do_GetInterface(mWebBrowser));
    return clipboard->CanCopySelection (result);
}

nsresult EphyWrapper::CanPaste(PRBool *result)
{
    nsCOMPtr<nsIClipboardCommands> clipboard (do_GetInterface(mWebBrowser));
    return clipboard->CanPaste (result);
}

nsresult EphyWrapper::CutSelection(void)
{
    nsCOMPtr<nsIClipboardCommands> clipboard (do_GetInterface(mWebBrowser));
    return clipboard->CutSelection ();
}

nsresult EphyWrapper::CopySelection(void)
{
    nsCOMPtr<nsIClipboardCommands> clipboard (do_GetInterface(mWebBrowser));
    return clipboard->CopySelection ();
}

nsresult EphyWrapper::Paste(void)
{
    nsCOMPtr<nsIClipboardCommands> clipboard (do_GetInterface(mWebBrowser));
    return clipboard->Paste ();
}

nsresult EphyWrapper::SelectAll (void)
{
    nsCOMPtr<nsIClipboardCommands> clipboard (do_GetInterface(mWebBrowser));
    return clipboard->SelectAll ();
}

nsresult EphyWrapper::PushTargetDocument (nsIDOMDocument *domDoc)
{
    mTargetDocument = domDoc;

    return NS_OK;
}

nsresult EphyWrapper::PopTargetDocument ()
{
    mTargetDocument = nsnull;

    return NS_OK;
}