path: root/embed/mozilla/EventContext.cpp

/*
 *  Copyright (C) 2000-2004 Marco Pesenti Gritti
 *  Copyright (C) 2003, 2004 Christian Persch
 *
 *  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.
 *
 *  $Id$
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "EventContext.h"
#include "nsIDOMEventTarget.h"
#include "nsIDocument.h"
#include "nsIDOMHTMLInputElement.h"
#include "nsIDOMHTMLObjectElement.h"
#include "nsIInterfaceRequestor.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsIDOMElement.h"
#include "nsIDOMXULDocument.h"
#include "nsIURI.h"
#include "nsNetUtil.h"
#include "nsIDOMNSDocument.h"
#include "nsReadableUtils.h"
#include "nsGUIEvent.h"
#include "nsIDOMNSEvent.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMHTMLButtonElement.h"
#include "nsIDOMHTMLLabelElement.h"
#include "nsIDOMHTMLLegendElement.h"
#include "nsIDOMHTMLTextAreaElement.h"
#include <gdk/gdkkeysyms.h>
#include "nsIPrivateDOMEvent.h"
#include "nsIDOMNSUIEvent.h"

#define KEY_CODE 256

EventContext::EventContext ()
{
}

EventContext::~EventContext ()
{
}

nsresult EventContext::Init (EphyBrowser *browser)
{
    mBrowser = browser;
    mDOMDocument = nsnull;

    return NS_OK;
}

nsresult EventContext::GatherTextUnder (nsIDOMNode* aNode, nsString& aResult)
{
    nsAutoString text;
    nsCOMPtr<nsIDOMNode> node;
    aNode->GetFirstChild(getter_AddRefs(node));
    PRUint32 depth = 1;

    while (node && depth)
    {
        nsCOMPtr<nsIDOMCharacterData> charData(do_QueryInterface(node));
        PRUint16 nodeType;

        node->GetNodeType(&nodeType);
        if (charData && nodeType == nsIDOMNode::TEXT_NODE)
        {
            /* Add this text to our collection. */
            text += NS_LITERAL_STRING(" ");
            nsAutoString data;
            charData->GetData(data);
            text += data;
        }
        else
        {
            nsCOMPtr<nsIDOMHTMLImageElement> img(do_QueryInterface(node));
            if (img)
            {
                nsAutoString altText;
                img->GetAlt(altText);
                if (!altText.IsEmpty())
                {
                    text = altText;
                    break;
                }
            }
        }

        /* Find the next node to test. */
        PRBool hasChildNodes;
        node->HasChildNodes(&hasChildNodes);
        if (hasChildNodes)
        {
            nsCOMPtr<nsIDOMNode> temp = node;
            temp->GetFirstChild(getter_AddRefs(node));
            depth++;
        }
        else
        {
            nsCOMPtr<nsIDOMNode> nextSibling;
            node->GetNextSibling(getter_AddRefs(nextSibling));
            if (nextSibling)
            {
                node = nextSibling;
            }
            else
            {
                nsCOMPtr<nsIDOMNode> parentNode;
                node->GetParentNode(getter_AddRefs(parentNode));
                if (!parentNode)
                {
                    node = nsnull;
                }
                else
                {
                    nsCOMPtr<nsIDOMNode> nextSibling;
                    parentNode->GetNextSibling(getter_AddRefs(nextSibling));
                    node = nextSibling;
                    depth--;
                }
            }
        }
    }

    text.CompressWhitespace();
    aResult = text;

    return NS_OK;
}

nsresult EventContext::ResolveBaseURL (nsIDocument *doc, const nsAString &relurl, nsACString &url)
{
    nsresult rv;
#if MOZILLA_SNAPSHOT > 13
    nsIURI *base;
    base = doc->GetBaseURI ();
    if (!base) return NS_ERROR_FAILURE;
#elif MOZILLA_SNAPSHOT > 11
    nsIURI *base;
    base = doc->GetBaseURL ();
    if (!base) return NS_ERROR_FAILURE;
#endif

    return base->Resolve (NS_ConvertUTF16toUTF8(relurl), url);
}

nsresult EventContext::ResolveDocumentURL (nsIDocument *doc, const nsAString &relurl, nsACString &url)
{
    nsresult rv;
#if MOZILLA_SNAPSHOT > 13
    nsIURI *uri;
    uri = doc->GetDocumentURI ();
    if (!uri) return NS_ERROR_FAILURE;
#elif MOZILLA_SNAPSHOT > 11
    nsIURI *uri;
    uri = doc->GetDocumentURL ();
    if (!uri) return NS_ERROR_FAILURE;
#endif

    return uri->Resolve (NS_ConvertUTF16toUTF8(relurl), url);
}

nsresult EventContext::GetEventContext (nsIDOMEventTarget *EventTarget,
                    MozillaEmbedEvent *info)
{
    nsresult rv;

    mEmbedEvent = info;

    info->context = EMBED_CONTEXT_DOCUMENT;

    nsCOMPtr<nsIDOMNode> node = do_QueryInterface(EventTarget, &rv);
    if (NS_FAILED(rv) || !node) return NS_ERROR_FAILURE;

        /* Is page xul ? then do not display context menus
     * FIXME I guess there is an easier way ... */
    /* From philipl: This test needs to be here otherwise we
     * arrogantly assume we can QI to a HTMLElement, which is
     * not true for xul content. */ 

    nsCOMPtr<nsIDOMDocument> domDoc;
    rv = node->GetOwnerDocument(getter_AddRefs(domDoc));
    if (NS_FAILED(rv) || !domDoc) return NS_ERROR_FAILURE;

    mDOMDocument = domDoc;

    nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc, &rv);
    if (NS_FAILED(rv) || !doc) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMXULDocument> xul_document = do_QueryInterface(domDoc);
    if (xul_document)
    {
        info->context = EMBED_CONTEXT_NONE;
        return NS_ERROR_FAILURE;
    }

    // Now we know that the page isn't a xul window, we can try and
    // do something useful with it.

    PRUint16 type;
    rv = node->GetNodeType(&type);
    if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMHTMLElement> element = do_QueryInterface(node);
    if ((nsIDOMNode::ELEMENT_NODE == type) && element)
    {
        nsAutoString tag;
        rv = element->GetTagName(tag);
        if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

        if (tag.EqualsIgnoreCase("img"))
        {
            info->context |= EMBED_CONTEXT_IMAGE;

            nsAutoString img;
            nsCOMPtr <nsIDOMHTMLImageElement> image = 
                        do_QueryInterface(node, &rv);
            if (NS_FAILED(rv) || !image) return NS_ERROR_FAILURE;           

            rv = image->GetSrc (img);
            if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
            SetStringProperty ("image", img);

            rv = image->GetAlt (img);
            if (NS_SUCCEEDED(rv))
            {
                SetStringProperty ("image_alt", img);   
            }

            rv = image->GetLongDesc (img);
            if (NS_SUCCEEDED(rv) && !img.IsEmpty())
            {
                nsCAutoString imglongdesc;
                                rv = ResolveDocumentURL (doc, img, imglongdesc);
                                                                                                                
                                SetStringProperty ("image_long_desc",
                                                   NS_ConvertUTF8toUTF16(imglongdesc));
            }

            int imgwidth, imgheight;
            rv = image->GetWidth (&imgwidth);
            rv = image->GetHeight (&imgheight);
            SetIntProperty ("image_width", imgwidth);
            SetIntProperty ("image_height", imgheight);

            rv = element->GetTitle (img);
                        if (NS_SUCCEEDED(rv))
            {
                SetStringProperty ("image_title",
                           img);
            }
        }
        else if (tag.EqualsIgnoreCase("input"))
        {
            nsCOMPtr<nsIDOMElement> element;
            element = do_QueryInterface (node);
            if (!element) return NS_ERROR_FAILURE;

            NS_NAMED_LITERAL_STRING(attr, "type");
            nsAutoString value;
            element->GetAttribute (attr, value);

            if (value.EqualsIgnoreCase("image"))
            {
                info->context |= EMBED_CONTEXT_IMAGE;
                nsCOMPtr<nsIDOMHTMLInputElement> input;
                input = do_QueryInterface (node);
                if (!input) return NS_ERROR_FAILURE;

                nsAutoString img;
                rv = input->GetSrc (img);
                if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

                nsCAutoString cImg;
                rv = ResolveDocumentURL (doc, img, cImg);
                                if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
                SetStringProperty ("image",
                           NS_ConvertUTF8toUTF16(cImg));
            }
            else if (!value.EqualsIgnoreCase("radio")  &&
                 !value.EqualsIgnoreCase("submit") &&
                 !value.EqualsIgnoreCase("reset")  &&
                 !value.EqualsIgnoreCase("hidden") &&
                 !value.EqualsIgnoreCase("button") &&
                 !value.EqualsIgnoreCase("checkbox"))
            {
                info->context |= EMBED_CONTEXT_INPUT;
            }
        }
        else if (tag.EqualsIgnoreCase("textarea"))
        {
            info->context |= EMBED_CONTEXT_INPUT;
        }
        else if (tag.EqualsIgnoreCase("object"))
        {
            nsCOMPtr<nsIDOMHTMLObjectElement> object;
            object = do_QueryInterface (node);
            if (!element) return NS_ERROR_FAILURE;

            nsAutoString value;
            object->GetType(value);

            // MIME types are always lower case
            if (Substring (value, 0, 6).Equals(NS_LITERAL_STRING("image/")))
            {
                info->context |= EMBED_CONTEXT_IMAGE;
                
                nsAutoString img;
                
                rv = object->GetData (img);
                if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
                
                nsCAutoString cImg;
                rv = ResolveDocumentURL (doc, img, cImg);
                                if (NS_FAILED (rv)) return NS_ERROR_FAILURE;

                SetStringProperty ("image", cImg.get());
            }
            else
            {
                info->context = EMBED_CONTEXT_NONE;
                return NS_OK;
            }
        }
    }

    /* Is page framed ? */
    PRBool framed;
    IsPageFramed (node, &framed);
    SetIntProperty ("framed_page", framed);

    /* Bubble out, looking for items of interest */
    while (node)
    {
        nsCOMPtr <nsIDOMElement> dom_elem = do_QueryInterface(node);
        if (dom_elem)
        {
            NS_NAMED_LITERAL_STRING(nspace, "http://www.w3.org/1999/xlink");
            NS_NAMED_LITERAL_STRING(localname_type, "type");

            nsAutoString value;
            dom_elem->GetAttributeNS (nspace, localname_type, value);

            if (value.EqualsIgnoreCase("simple"))
            {
                info->context |= EMBED_CONTEXT_LINK;
                NS_NAMED_LITERAL_STRING (localname_href, "href");
                dom_elem->GetAttributeNS (nspace, localname_href, value);
                
                SetStringProperty ("link", value);
                CheckLinkScheme (value);
            }
        }

        PRUint16 type;
        rv = node->GetNodeType(&type);
        if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

        element = do_QueryInterface(node);
        if ((nsIDOMNode::ELEMENT_NODE == type) && element)
        {
            nsAutoString tag;
            rv = element->GetTagName(tag);
            if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

            /* Link */
            if (tag.EqualsIgnoreCase("a"))
            {
                nsAutoString tmp;
                nsAutoString substr;

                rv = GatherTextUnder (node, tmp);
                if (NS_SUCCEEDED(rv))
                                    SetStringProperty ("linktext", tmp);

                nsCOMPtr <nsIDOMHTMLAnchorElement> anchor =
                    do_QueryInterface(node);

                anchor->GetHref (tmp);
                substr.Assign (Substring (tmp, 0, 7));
                if (substr.EqualsIgnoreCase("mailto:"))
                {
                    info->context |= EMBED_CONTEXT_EMAIL_LINK;
                    const nsAString &address = Substring(tmp, 7, tmp.Length()-7);
                    SetStringProperty ("email", address);
                }
                
                if (anchor && !tmp.IsEmpty()) 
                {
                    info->context |= EMBED_CONTEXT_LINK;

                    SetStringProperty ("link", tmp);
                    CheckLinkScheme (tmp);
                    rv = anchor->GetHreflang (tmp);
                    if (NS_SUCCEEDED(rv))
                        SetStringProperty ("link_lang", tmp);
                    rv = anchor->GetTarget (tmp);
                    if (NS_SUCCEEDED(rv))
                        SetStringProperty ("link_target", tmp);
                    rv = anchor->GetRel (tmp);
                    if (NS_SUCCEEDED(rv))
                        SetStringProperty ("link_rel", tmp);
                    rv = anchor->GetRev (tmp);
                    if (NS_SUCCEEDED(rv))
                        SetStringProperty ("link_rev", tmp);
                    rv = element->GetTitle (tmp);
                                if (NS_SUCCEEDED(rv))
                        SetStringProperty ("link_title", tmp);
                    rv = anchor->GetType (tmp);
                    if (NS_SUCCEEDED(rv))
                        SetStringProperty ("link_type", tmp);

                    if (tmp.EqualsIgnoreCase("text/smartbookmark"))
                    {
                        SetIntProperty ("link_is_smart", TRUE);
                        
                        nsCOMPtr<nsIDOMNode> childNode;
                        node->GetFirstChild (getter_AddRefs(childNode));
                        if (childNode)
                        {
                            nsCOMPtr <nsIDOMHTMLImageElement> image = 
                                do_QueryInterface(childNode, &rv);

                            if (image)
                            {
                                nsAutoString img;
                                rv = image->GetSrc (img);
                                if (!NS_FAILED(rv))
                                {
                                    SetStringProperty ("image", img);
                                }
                            }
                        }
                    }
                    else
                    {
                        SetIntProperty ("link_is_smart", FALSE);
                    }
                }
            
            }
            else if (tag.EqualsIgnoreCase("option"))
            {
                info->context = EMBED_CONTEXT_NONE;
                return NS_OK;
            }
            if (tag.EqualsIgnoreCase("area"))
            {
                info->context |= EMBED_CONTEXT_LINK;
                nsCOMPtr <nsIDOMHTMLAreaElement> area =
                        do_QueryInterface(node, &rv);
                if (NS_SUCCEEDED(rv) && area)
                {
                    nsAutoString href;
                    rv = area->GetHref (href);
                    if (NS_FAILED(rv))
                        return NS_ERROR_FAILURE;
                    
                    SetStringProperty ("link", href);
                    CheckLinkScheme (href);
                }
            }
            else if (tag.EqualsIgnoreCase("textarea") ||
                 tag.EqualsIgnoreCase("input"))
            {
                info->context |= EMBED_CONTEXT_INPUT;
            }

            nsCOMPtr<nsIDOMElement> domelement;
            domelement = do_QueryInterface (node);
            if (!domelement) return NS_ERROR_FAILURE;

            PRBool has_background = PR_FALSE;

            NS_NAMED_LITERAL_STRING(attr, "background");
            nsAutoString value;
            domelement->GetAttribute (attr, value);
                
            if (!value.IsEmpty())
            {
                nsCAutoString bgimg;

                rv = ResolveDocumentURL (doc, value, bgimg);
                                if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

                SetStringProperty ("background_image", bgimg.get());
            }
            else
            {
                nsCOMPtr<nsIDOMHTMLBodyElement> bgelement;
                bgelement = do_QueryInterface (node);
                if (bgelement)
                {
                    nsAutoString value;
                    bgelement->GetBackground (value);

                    if (!value.IsEmpty())
                    {
                        nsCAutoString bgimg;

                        rv = ResolveBaseURL (doc, value, bgimg);
                                                if (NS_FAILED(rv))
                                                        return NS_ERROR_FAILURE;

                        SetStringProperty ("background_image",
                           bgimg.get());
                        has_background = PR_TRUE;
                    }
                }
            }

            if (!has_background)
            {
                nsAutoString cssurl;
                rv = GetCSSBackground (node, cssurl);
                if (NS_SUCCEEDED (rv))
                {
                    nsCAutoString bgimg;

                                        rv = ResolveBaseURL (doc, cssurl, bgimg);
                                        if (NS_FAILED (rv))
                                                return NS_ERROR_FAILURE;
                    SetStringProperty ("background_image",
                                   bgimg.get());
                    if (NS_FAILED (rv))
                        return NS_ERROR_FAILURE;
                }
            }
        }
        
        nsCOMPtr<nsIDOMNode> parentNode;
        node->GetParentNode (getter_AddRefs(parentNode));
        node = parentNode;
    }
    
    return NS_OK;
}

nsresult EventContext::GetCSSBackground (nsIDOMNode *node, nsAutoString& url)
{
    nsresult result;

    nsCOMPtr<nsIDOMElementCSSInlineStyle> style;
    style = do_QueryInterface (node);
    if (!style) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMCSSStyleDeclaration> decl;
    result = style->GetStyle (getter_AddRefs(decl));
    if (NS_FAILED(result)) return NS_ERROR_FAILURE;

    nsAutoString value;
    NS_NAMED_LITERAL_STRING(prop_bgi, "background-image");
    decl->GetPropertyValue (prop_bgi, value);

    if (value.IsEmpty())
    {
        NS_NAMED_LITERAL_STRING(prop_bg, "background");
        decl->GetPropertyValue (prop_bg, value);
        if (value.IsEmpty())
        {
            NS_NAMED_LITERAL_STRING(prop_bgr, "background-repeat");
            decl->GetPropertyValue (prop_bgr, value);
            if (value.IsEmpty())
                return NS_ERROR_FAILURE;
        }
    }

    PRInt32 start, end;
    nsAutoString cssurl;

    NS_NAMED_LITERAL_STRING(startsub, "url(");
    NS_NAMED_LITERAL_STRING(endsub, ")");

    start = value.Find (startsub) + 4;
    end = value.Find (endsub);

    if (start == -1 || end == -1)
        return NS_ERROR_FAILURE;

    url.Assign(Substring (value, start, end - start));

    return NS_OK;
}

nsresult EventContext::GetMouseEventInfo (nsIDOMMouseEvent *aMouseEvent, MozillaEmbedEvent *info)
{
    nsresult result;

    /* casting 32-bit guint* to PRUint16* below will break on big-endian */
    PRUint16 btn;
    aMouseEvent->GetButton (&btn);

    switch (btn)
    {
        case 0:
            info->type = EPHY_EMBED_EVENT_MOUSE_BUTTON1;
        break;
        case 1:
            info->type = EPHY_EMBED_EVENT_MOUSE_BUTTON2;
        break;
        case 2:
            info->type = EPHY_EMBED_EVENT_MOUSE_BUTTON3;
        break;

        default:
            g_warning ("Unknown mouse button");
    }

    /* OTOH, casting only between (un)signedness is safe */
    aMouseEvent->GetScreenX ((PRInt32*)&info->x);
    aMouseEvent->GetScreenY ((PRInt32*)&info->y);

    /* be sure we are not clicking on the scroolbars */

    nsCOMPtr<nsIDOMNSEvent> nsEvent = do_QueryInterface(aMouseEvent, &result);
    if (NS_FAILED(result) || !nsEvent) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMEventTarget> OriginalTarget;
    result = nsEvent->GetOriginalTarget(getter_AddRefs(OriginalTarget));
    if (NS_FAILED(result) || !OriginalTarget) return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMNode> OriginalNode = do_QueryInterface(OriginalTarget);
    if (!OriginalNode) return NS_ERROR_FAILURE;

    nsAutoString nodename;
    OriginalNode->GetNodeName(nodename);

    if (nodename.EqualsIgnoreCase("xul:scrollbarbutton") ||
        nodename.EqualsIgnoreCase("xul:thumb")       ||
        nodename.EqualsIgnoreCase("xul:vbox")        ||
        nodename.EqualsIgnoreCase("xul:spacer")      ||
        nodename.EqualsIgnoreCase("xul:slider"))
        return NS_ERROR_FAILURE;

    nsCOMPtr<nsIDOMEventTarget> EventTarget;
    result = aMouseEvent->GetTarget(getter_AddRefs(EventTarget));
    if (NS_FAILED(result) || !EventTarget) return NS_ERROR_FAILURE;

    result = GetEventContext (EventTarget, info);
    if (NS_FAILED(result)) return result;

    /* Get the modifier */

    PRBool mod_key;

    info->modifier = 0;

    aMouseEvent->GetAltKey(&mod_key);
    if (mod_key) info->modifier |= GDK_MOD1_MASK;

    aMouseEvent->GetShiftKey(&mod_key);
    if (mod_key) info->modifier |= GDK_SHIFT_MASK;

    aMouseEvent->GetMetaKey(&mod_key);
    if (mod_key) info->modifier |= GDK_MOD2_MASK;
    
    aMouseEvent->GetCtrlKey(&mod_key);
    if (mod_key) info->modifier |= GDK_CONTROL_MASK;

    return NS_OK;
}

nsresult EventContext::GetKeyEventInfo (nsIDOMKeyEvent *aKeyEvent, MozillaEmbedEvent *info)
{
    nsresult rv;

    info->type = EPHY_EMBED_EVENT_KEY;

    PRUint32 keyCode;
    rv = aKeyEvent->GetKeyCode(&keyCode);
    if (NS_FAILED(rv)) return rv;
    info->keycode = keyCode;

    nsCOMPtr<nsIDOMEventTarget> target;
    rv = aKeyEvent->GetTarget(getter_AddRefs(target));
    if (NS_FAILED(rv) || !target) return NS_ERROR_FAILURE;

    /* Calculate the node coordinates relative to the widget origin */
    nsCOMPtr<nsIDOMNSHTMLElement> elem = do_QueryInterface(target, &rv);
    if (NS_FAILED(rv)) return rv;

    PRInt32 x = 0, y = 0;
    while (elem)
    {
        PRInt32 val;
        elem->GetOffsetTop(&val);   y += val;
        elem->GetScrollTop(&val);   y -= val;
        elem->GetOffsetLeft(&val);  x += val;
        elem->GetScrollLeft(&val);  x -= val;

        nsCOMPtr<nsIDOMElement> parent;
        elem->GetOffsetParent(getter_AddRefs(parent));
        elem = do_QueryInterface(parent, &rv);
    }
    info->x = x;
    info->y = y;

    /* Context */
    rv = GetEventContext (target, info);
    if (NS_FAILED(rv)) return rv;

    /* Get the modifier */

    PRBool mod_key;

    info->modifier = 0;

    aKeyEvent->GetAltKey(&mod_key);
    if (mod_key) info->modifier |= GDK_MOD1_MASK;

    aKeyEvent->GetShiftKey(&mod_key);
    if (mod_key) info->modifier |= GDK_SHIFT_MASK;

    aKeyEvent->GetMetaKey(&mod_key);
    if (mod_key) info->modifier |= GDK_MOD2_MASK;
    
    aKeyEvent->GetCtrlKey(&mod_key);
    if (mod_key) info->modifier |= GDK_CONTROL_MASK;

    return NS_OK;
}

nsresult EventContext::IsPageFramed (nsIDOMNode *node, PRBool *Framed)
{
    nsresult result;

    nsCOMPtr<nsIDOMDocument> mainDocument;
    result = mBrowser->GetDocument (getter_AddRefs(mainDocument));
    if (NS_FAILED(result) || !mainDocument) return NS_ERROR_FAILURE;
    
    nsCOMPtr<nsIDOMDocument> nodeDocument;
    result = node->GetOwnerDocument (getter_AddRefs(nodeDocument));
    if (NS_FAILED(result) || !nodeDocument) return NS_ERROR_FAILURE;
 
    *Framed = (mainDocument != nodeDocument);

        return NS_OK;
}

nsresult EventContext::GetTargetDocument (nsIDOMDocument **domDoc)
{
    if (!mDOMDocument) return NS_ERROR_FAILURE;

    *domDoc = mDOMDocument.get();

    NS_IF_ADDREF(*domDoc);

    return NS_OK;
}

nsresult EventContext::CheckLinkScheme (const nsAString &link)
{
    nsCOMPtr<nsIURI> uri;
    NS_NewURI (getter_AddRefs (uri), link);
    if (!uri) return NS_ERROR_FAILURE;

    nsresult rv;
    nsCAutoString scheme;
    rv = uri->GetScheme (scheme);
    if (NS_FAILED (rv)) return NS_ERROR_FAILURE;

    if (scheme.EqualsIgnoreCase ("http")     ||
        scheme.EqualsIgnoreCase ("https")    ||
        scheme.EqualsIgnoreCase ("ftp")  ||
        scheme.EqualsIgnoreCase ("file")     ||
        scheme.EqualsIgnoreCase ("data")     ||
        scheme.EqualsIgnoreCase ("resource") ||
        scheme.EqualsIgnoreCase ("about")    ||
        scheme.EqualsIgnoreCase ("gopher"))
    {
        SetIntProperty ("link-has-web-scheme", TRUE);
    }

    return NS_OK;
}

nsresult EventContext::SetIntProperty (const char *name, int value)
{

    GValue *val = g_new0 (GValue, 1);

    g_value_init (val, G_TYPE_INT);
    
    g_value_set_int (val, value);

    mozilla_embed_event_set_property (mEmbedEvent, name, val);

    return NS_OK;
}

nsresult EventContext::SetStringProperty (const char *name, const char *value)
{
    GValue *val = g_new0 (GValue, 1);

    g_value_init (val, G_TYPE_STRING);
    
    g_value_set_string (val, value);
             
    mozilla_embed_event_set_property (mEmbedEvent, name, val);

    return NS_OK;
}

nsresult EventContext::SetStringProperty (const char *name, const nsAString &value)
{
    return SetStringProperty (name, NS_ConvertUTF16toUTF8(value).get());
}