path: root/embed/mozilla/mozilla-embed.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.
 *
 *  $Id$
 */

#include "mozilla-config.h"

#include "config.h"

#include "mozilla-embed.h"
#include "mozilla-embed-event.h"
#include "ephy-embed-single.h"
#include "ephy-embed-shell.h"
#include "ephy-command-manager.h"
#include "ephy-string.h"
#include "ephy-debug.h"

#include "EphyBrowser.h"
#include "EventContext.h"
#include "EphyUtils.h"

#include <gtkmozembed.h>
#undef MOZILLA_INTERNAL_API
#include <nsEmbedString.h>
#define MOZILLA_INTERNAL_API 1
#include <nsMemory.h>
#include <nsIURI.h>
#include <nsIRequest.h>
#include <nsIWebProgressListener.h>
#include <nsGfxCIID.h>

static void mozilla_embed_class_init    (MozillaEmbedClass *klass);
static void mozilla_embed_init      (MozillaEmbed *gs);
static void mozilla_embed_destroy       (GtkObject *object);
static void mozilla_embed_finalize      (GObject *object);
static void ephy_embed_iface_init       (EphyEmbedIface *iface);

static void mozilla_embed_location_changed_cb   (GtkMozEmbed *embed,
                         MozillaEmbed *membed);
static void mozilla_embed_net_state_all_cb  (GtkMozEmbed *embed,
                         const char *aURI,
                         gint state,
                         guint status,
                         MozillaEmbed *membed);
static gboolean mozilla_embed_dom_mouse_click_cb(GtkMozEmbed *embed,
                         gpointer dom_event,
                         MozillaEmbed *membed);
static gboolean mozilla_embed_dom_mouse_down_cb (GtkMozEmbed *embed,
                         gpointer dom_event, 
                         MozillaEmbed *membed);
static gboolean mozilla_embed_dom_key_press_cb  (GtkMozEmbed *embed,
                         gpointer dom_event, 
                         MozillaEmbed *membed);
static void mozilla_embed_new_window_cb     (GtkMozEmbed *embed, 
                         GtkMozEmbed **newEmbed,
                         guint chrome_mask,
                         MozillaEmbed *membed);
static void mozilla_embed_security_change_cb    (GtkMozEmbed *embed, 
                         gpointer request,
                         PRUint32 state,
                         MozillaEmbed *membed);
static EphyEmbedSecurityLevel mozilla_embed_security_level (PRUint32 state);

#define MOZILLA_EMBED_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), MOZILLA_TYPE_EMBED, MozillaEmbedPrivate))

typedef enum
{
    MOZILLA_EMBED_LOAD_STARTED,
    MOZILLA_EMBED_LOAD_REDIRECTING,
    MOZILLA_EMBED_LOAD_LOADING,
    MOZILLA_EMBED_LOAD_STOPPED
} MozillaEmbedLoadState;

struct MozillaEmbedPrivate
{
    EphyBrowser *browser;
    MozillaEmbedLoadState load_state;
#ifdef GTKMOZEMBED_BROKEN_FOCUS
    guint focus_connected : 1;
#endif /* GTKMOZEMBED_BROKEN_FOCUS */
};

#define WINDOWWATCHER_CONTRACTID "@mozilla.org/embedcomp/window-watcher;1"

static GObjectClass *parent_class = NULL;

#ifdef GTKMOZEMBED_BROKEN_FOCUS
static guint fiesid = 0;
static guint foesid = 0;
#endif /* GTKMOZEMBED_BROKEN_FOCUS */

static void
impl_manager_do_command (EphyCommandManager *manager,
             const char *command) 
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(manager)->priv;

    mpriv->browser->DoCommand (command);
}

static gboolean
impl_manager_can_do_command (EphyCommandManager *manager,
                 const char *command) 
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(manager)->priv;
    nsresult rv;
    PRBool enabled;

        rv = mpriv->browser->GetCommandState (command, &enabled);

    return NS_SUCCEEDED (rv) ? enabled : FALSE;
}

static void
ephy_command_manager_iface_init (EphyCommandManagerIface *iface)
{
    iface->do_command = impl_manager_do_command;
    iface->can_do_command = impl_manager_can_do_command;
}
    
GType 
mozilla_embed_get_type (void)
{
        static GType type = 0;

        if (G_UNLIKELY (type == 0))
        {
                static const GTypeInfo our_info =
                {
                        sizeof (MozillaEmbedClass),
                        NULL, /* base_init */
                        NULL, /* base_finalize */
                        (GClassInitFunc) mozilla_embed_class_init,
                        NULL,
                        NULL, /* class_data */
                        sizeof (MozillaEmbed),
                        0, /* n_preallocs */
                        (GInstanceInitFunc) mozilla_embed_init
                };

        static const GInterfaceInfo embed_info =
        {
            (GInterfaceInitFunc) ephy_embed_iface_init,
                NULL,
                NULL
            };

        static const GInterfaceInfo ephy_command_manager_info =
        {
            (GInterfaceInitFunc) ephy_command_manager_iface_init,
                NULL,
                NULL
             };
    
                type = g_type_register_static (GTK_TYPE_MOZ_EMBED,
                           "MozillaEmbed",
                           &our_info, 
                           (GTypeFlags)0);
        g_type_add_interface_static (type,
                                         EPHY_TYPE_EMBED,
                                         &embed_info);
        g_type_add_interface_static (type,
                                         EPHY_TYPE_COMMAND_MANAGER,
                                         &ephy_command_manager_info);
        }

        return type;
}

static void
mozilla_embed_grab_focus (GtkWidget *widget)
{
    GtkWidget *child;

    child = gtk_bin_get_child (GTK_BIN (widget));

    if (child != NULL)
    {
        gtk_widget_grab_focus (child);
    }
    else
    {
        g_warning ("Need to realize the embed before grabbing focus!\n");
    }
}

#ifdef GTKMOZEMBED_BROKEN_FOCUS
static gboolean
child_focus_in_event_cb (GtkWidget *child,
             GdkEventFocus *event,
             MozillaEmbed *embed)
{
    embed->priv->browser->FocusActivate ();

    return FALSE;
}

static gboolean
child_focus_out_event_cb (GtkWidget *child,
              GdkEventFocus *event,
              MozillaEmbed *embed)
{
    embed->priv->browser->FocusDeactivate ();

    return FALSE;
}
#endif /* GTKMOZEMBED_BROKEN_FOCUS */

static void
mozilla_embed_realize (GtkWidget *widget)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED (widget)->priv;
    GtkBin *bin = GTK_BIN (widget);

    GTK_WIDGET_CLASS (parent_class)->realize (widget);

    /* Initialise our helper class */
    nsresult rv;
    rv = mpriv->browser->Init (GTK_MOZ_EMBED (widget));
    if (NS_FAILED (rv))
    {
        g_warning ("EphyBrowser initialization failed for %p\n", widget);
        return;
    }

#ifdef GTKMOZEMBED_BROKEN_FOCUS
    /* HACK ALERT! This depends highly on undocumented interna of
     * GtkMozEmbed!
     *
     * GtkMozEmbed::realize installs focus-[in|out]-event handlers to
     * toplevel, and, on the first realize only, to the child.
     * GtkMozEmbed disconnects its focus-[in|out]-event handler
     * to the toplevel on unrealize, and leaves the ones to the child
     * in place. So we don't need to unblock the blocked handlers
     * and therefore need no ::unrealize handler.
    */

    GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
    gpointer data = ((GtkMozEmbed *) widget)->data;

    guint n;

    n = g_signal_handlers_block_matched (toplevel,
                         (GSignalMatchType) (G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DATA),
                         fiesid, 0, NULL, NULL, data);
    n += g_signal_handlers_block_matched (toplevel,
                          (GSignalMatchType) (G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DATA),
                          foesid, 0, NULL, NULL, data);
    if (n != 2)
    {
        g_warning ("Unexpected number (n=%d) of toplevel focus handlers found!\n", n);
    }

    if (mpriv->focus_connected) return;

    GtkWidget *child = gtk_bin_get_child (bin);
    g_return_if_fail (child != NULL);

    n = g_signal_handlers_block_matched (child,
                         (GSignalMatchType) (G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DATA),
                         fiesid, 0, NULL, NULL, widget);
    n += g_signal_handlers_block_matched (child,
                          (GSignalMatchType) (G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DATA),
                          foesid, 0, NULL, NULL, widget);
    if (n != 2)
    {
        g_warning ("Unexpected number (n=%d) of child focus handlers found!\n", n);
    }

    g_signal_connect_object (child, "focus-in-event",
                 G_CALLBACK (child_focus_in_event_cb), widget,
                 G_CONNECT_AFTER);
    g_signal_connect_object (child, "focus-out-event",
                 G_CALLBACK (child_focus_out_event_cb), widget,
                 G_CONNECT_AFTER);

    mpriv->focus_connected = TRUE;
#endif /* GTKMOZEMBED_BROKEN_FOCUS */
}

static GObject *
mozilla_embed_constructor (GType type, guint n_construct_properties,
               GObjectConstructParam *construct_params)
{
    g_object_ref (embed_shell);

    /* we depend on single because of mozilla initialization */
    ephy_embed_shell_get_embed_single (embed_shell);

    return parent_class->constructor (type, n_construct_properties,
                      construct_params);
}

static void
mozilla_embed_class_init (MozillaEmbedClass *klass)
{
        GObjectClass *object_class = G_OBJECT_CLASS (klass);
        GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (klass); 
        GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass); 

    parent_class = (GObjectClass *) g_type_class_peek_parent (klass);

    object_class->constructor = mozilla_embed_constructor;
    object_class->finalize = mozilla_embed_finalize;

    gtk_object_class->destroy = mozilla_embed_destroy;

    widget_class->grab_focus = mozilla_embed_grab_focus;
    widget_class->realize = mozilla_embed_realize;

#ifdef GTKMOZEMBED_BROKEN_FOCUS
    fiesid = g_signal_lookup ("focus-in-event", GTK_TYPE_WIDGET);
    foesid = g_signal_lookup ("focus-out-event", GTK_TYPE_WIDGET);
#endif /* GTKMOZEMBED_BROKEN_FOCUS */

    g_type_class_add_private (object_class, sizeof(MozillaEmbedPrivate));
}

static void
mozilla_embed_init (MozillaEmbed *embed)
{
        embed->priv = MOZILLA_EMBED_GET_PRIVATE (embed);
    embed->priv->browser = new EphyBrowser ();

    g_signal_connect_object (G_OBJECT (embed), "location",
                 G_CALLBACK (mozilla_embed_location_changed_cb),
                 embed, (GConnectFlags) 0);
    g_signal_connect_object (G_OBJECT (embed), "net_state_all",
                 G_CALLBACK (mozilla_embed_net_state_all_cb),
                 embed, (GConnectFlags) 0);
    g_signal_connect_object (G_OBJECT (embed), "dom_mouse_click",
                 G_CALLBACK (mozilla_embed_dom_mouse_click_cb),
                 embed, (GConnectFlags) 0);
    g_signal_connect_object (G_OBJECT (embed), "dom_mouse_down",
                 G_CALLBACK (mozilla_embed_dom_mouse_down_cb),
                 embed, (GConnectFlags) 0);
    g_signal_connect_object (G_OBJECT (embed), "dom-key-press",
                 G_CALLBACK (mozilla_embed_dom_key_press_cb),
                 embed, (GConnectFlags) 0);
    g_signal_connect_object (G_OBJECT (embed), "new_window",
                 G_CALLBACK (mozilla_embed_new_window_cb),
                 embed, (GConnectFlags) 0);
    g_signal_connect_object (G_OBJECT (embed), "security_change",
                 G_CALLBACK (mozilla_embed_security_change_cb),
                 embed, (GConnectFlags) 0);
}

gpointer
_mozilla_embed_get_ephy_browser (MozillaEmbed *embed)
{
    g_return_val_if_fail (embed->priv->browser != NULL, NULL);
    
    return embed->priv->browser;
}

static void
mozilla_embed_destroy (GtkObject *object)
{
    MozillaEmbed *embed = MOZILLA_EMBED (object);

    if (embed->priv->browser)
    {
        embed->priv->browser->Destroy();
    }
    
    GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static void
mozilla_embed_finalize (GObject *object)
{
    MozillaEmbed *embed = MOZILLA_EMBED (object);

    if (embed->priv->browser)
    {
            delete embed->priv->browser;
            embed->priv->browser = nsnull;
    }

    G_OBJECT_CLASS (parent_class)->finalize (object);

    g_object_unref (embed_shell);
}

static void
impl_load_url (EphyEmbed *embed, 
               const char *url)
{
        gtk_moz_embed_load_url (GTK_MOZ_EMBED(embed), url);
}

static void
impl_stop_load (EphyEmbed *embed)
{
    gtk_moz_embed_stop_load (GTK_MOZ_EMBED(embed)); 
}

static gboolean
impl_can_go_back (EphyEmbed *embed)
{
    return gtk_moz_embed_can_go_back (GTK_MOZ_EMBED(embed));
}

static gboolean
impl_can_go_forward (EphyEmbed *embed)
{
    return gtk_moz_embed_can_go_forward (GTK_MOZ_EMBED(embed));
}

static gboolean
mozilla_embed_get_uri_parent (MozillaEmbed *membed,
                  const char *aUri,
                  nsEmbedCString &aParent)
{
        nsresult rv;
    nsEmbedCString encoding;
    rv = membed->priv->browser->GetEncoding (encoding);
    if (NS_FAILED (rv)) return FALSE;

        nsCOMPtr<nsIURI> uri;
        rv = EphyUtils::NewURI (getter_AddRefs(uri), nsEmbedCString(aUri), encoding.get());
        if (NS_FAILED(rv) || !uri) return FALSE;

    /* Don't support going 'up' with chrome url's, mozilla handily
     * fixes them up for us, so it doesn't work properly, see
     * rdf/chrome/src/nsChromeProtocolHandler.cpp::NewURI()
     * (the Canonify() call)
     */
    nsEmbedCString scheme;
    rv = uri->GetScheme (scheme);
    if (NS_FAILED(rv) || !scheme.Length()) return FALSE;
    if (strcmp (scheme.get(), "chrome") == 0) return FALSE;

    nsEmbedCString path;
    rv = uri->GetPath(path);
    if (NS_FAILED(rv) || !path.Length()) return FALSE;
    if (strcmp (path.get (), "/") == 0) return FALSE;

    const char *slash = strrchr (path.BeginReading(), '/');
    if (!slash) return FALSE;

    if (slash[1] == '\0')
    {
        /* ends with a slash - a directory, go to parent */
        rv = uri->Resolve (nsEmbedCString(".."), aParent);
    }
    else
    {
        /* it's a file, go to the directory */
        rv = uri->Resolve (nsEmbedCString("."), aParent);
    }

    return NS_SUCCEEDED (rv);
}

static gboolean
impl_can_go_up (EphyEmbed *embed)
{
    MozillaEmbed *membed = MOZILLA_EMBED (embed);
    char *address;
    gboolean result;

    address = ephy_embed_get_location (embed, TRUE);
    if (address == NULL) return FALSE;

    nsEmbedCString parent;
    result = mozilla_embed_get_uri_parent (membed, address, parent);
    g_free (address);

    return result;
}

static GSList *
impl_get_go_up_list (EphyEmbed *embed)
{
    MozillaEmbed *membed = MOZILLA_EMBED (embed);
    GSList *l = NULL;
    char *address, *s;

    address = ephy_embed_get_location (embed, TRUE);
    if (address == NULL) return NULL;

    s = address;
    nsEmbedCString parent;
    while (mozilla_embed_get_uri_parent (membed, s, parent))
    {
        s = g_strdup (parent.get());
        l = g_slist_prepend (l, s);
    }

    g_free (address);

    return g_slist_reverse (l);
}

static void
impl_go_back (EphyEmbed *embed)
{
    gtk_moz_embed_go_back (GTK_MOZ_EMBED(embed));
}
        
static void
impl_go_forward (EphyEmbed *embed)
{
    gtk_moz_embed_go_forward (GTK_MOZ_EMBED(embed));
}

static void
impl_go_up (EphyEmbed *embed)
{
    MozillaEmbed *membed = MOZILLA_EMBED (embed);
    char *uri;

    uri = ephy_embed_get_location (embed, TRUE);
    if (uri == NULL) return;

    gboolean rv;
    nsEmbedCString parent_uri;
    rv = mozilla_embed_get_uri_parent (membed, uri, parent_uri);
    g_free (uri);

    g_return_if_fail (rv != FALSE);

    ephy_embed_load_url (embed, parent_uri.get ());
}

static char *
impl_get_title (EphyEmbed *embed)
{
    return gtk_moz_embed_get_title (GTK_MOZ_EMBED (embed));
}

static char *
impl_get_link_message (EphyEmbed *embed)
{
    return gtk_moz_embed_get_link_message (GTK_MOZ_EMBED (embed));
}

static char *
impl_get_js_status (EphyEmbed *embed)
{
    return gtk_moz_embed_get_js_status (GTK_MOZ_EMBED (embed));
}

static char *
impl_get_location (EphyEmbed *embed, 
                   gboolean toplevel)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    nsresult rv;

    nsCOMPtr<nsIURI> uri;
    if (toplevel)
    {
        rv = mpriv->browser->GetDocumentURI (getter_AddRefs (uri));
    }
    else
    {
        rv = mpriv->browser->GetTargetDocumentURI (getter_AddRefs (uri));
    }

    if (NS_FAILED (rv)) return NULL;

    nsCOMPtr<nsIURI> furi;
    rv = uri->Clone (getter_AddRefs (furi));
    if (NS_FAILED (rv)) return NULL;

    furi->SetPassword (nsEmbedCString());

    nsEmbedCString url;
    furi->GetSpec (url);

    return url.Length() ? g_strdup (url.get()) : NULL;
}

static void
impl_reload (EphyEmbed *embed, 
             gboolean force)
{
    guint32 mflags = GTK_MOZ_EMBED_FLAG_RELOADNORMAL;

    if (force)
    {
        mflags = GTK_MOZ_EMBED_FLAG_RELOADBYPASSPROXYANDCACHE;
    }

    gtk_moz_embed_reload (GTK_MOZ_EMBED(embed), mflags);
}

static void
impl_set_zoom (EphyEmbed *embed, 
               float zoom) 
{
    EphyBrowser *browser;
    nsresult rv;

    g_return_if_fail (zoom > 0.0);

    browser = MOZILLA_EMBED(embed)->priv->browser;
    g_return_if_fail (browser != NULL);

    rv = browser->SetZoom (zoom);

    if (NS_SUCCEEDED (rv))
    {
        g_signal_emit_by_name (embed, "ge_zoom_change", zoom);
    }
}

static float
impl_get_zoom (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    float f;

    nsresult rv;    
    rv = mpriv->browser->GetZoom (&f);
    
    if (NS_SUCCEEDED (rv))
    {
        return f;
    }

    return 1.0;
}

static int
impl_shistory_n_items (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    nsresult rv;
    int count, index;

    rv = mpriv->browser->GetSHInfo (&count, &index);

    return NS_SUCCEEDED(rv) ? count : 0;
}

static void
impl_shistory_get_nth (EphyEmbed *embed, 
                       int nth,
                       gboolean is_relative,
                       char **aUrl,
                       char **aTitle)
{
    nsresult rv;
        nsEmbedCString url;
    PRUnichar *title;
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;

    if (is_relative)
    {
        nth += ephy_embed_shistory_get_pos (embed);
    }
    
        rv = mpriv->browser->GetSHUrlAtIndex(nth, url);

        *aUrl = (NS_SUCCEEDED (rv) && url.Length()) ? g_strdup(url.get()) : NULL;

    rv = mpriv->browser->GetSHTitleAtIndex(nth, &title);

    if (title)
    {
        nsEmbedCString cTitle;
        NS_UTF16ToCString (nsEmbedString(title),
                   NS_CSTRING_ENCODING_UTF8, cTitle);
        *aTitle = g_strdup (cTitle.get());
        nsMemory::Free (title);
    }
    else
    {
        *aTitle = NULL;
    }
}

static int
impl_shistory_get_pos (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    nsresult rv;
    int count, index;

    rv = mpriv->browser->GetSHInfo (&count, &index);

    return NS_SUCCEEDED(rv) ? index : 0;
}

static void
impl_shistory_go_nth (EphyEmbed *embed, 
                      int nth)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;

    mpriv->browser->GoToHistoryIndex (nth);
}

static void
impl_get_security_level (EphyEmbed *embed,
                         EphyEmbedSecurityLevel *level,
                         char **description)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED (embed)->priv;

    if (level) *level = EPHY_EMBED_STATE_IS_UNKNOWN;
    if (description) *description = NULL;

    nsresult rv;
    PRUint32 state;
    nsEmbedCString desc;
    rv = mpriv->browser->GetSecurityInfo (&state, desc);
    if (NS_FAILED (rv)) return;

    if (level) *level = mozilla_embed_security_level (state);
    if (description) *description = g_strdup (desc.get());
}

static void
impl_show_page_certificate (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED (embed)->priv;

    mpriv->browser->ShowCertificate ();
}
    
static void
impl_print (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
 
    mpriv->browser->Print ();
}

static void
impl_set_print_preview_mode (EphyEmbed *embed, gboolean preview_mode)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;

    mpriv->browser->SetPrintPreviewMode (preview_mode);
}

static int
impl_print_preview_n_pages (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    nsresult rv;
    int num;

    rv = mpriv->browser->PrintPreviewNumPages(&num);

    return NS_SUCCEEDED (rv) ? num : 0;
}

static void
impl_print_preview_navigate (EphyEmbed *embed,
                 EphyEmbedPrintPreviewNavType type,
                 int page)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;

    mpriv->browser->PrintPreviewNavigate(type, page);
}

static void
impl_set_encoding (EphyEmbed *embed,
           const char *encoding)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    nsresult rv;
    nsEmbedCString currEnc;

    g_return_if_fail (encoding != NULL);

    rv = mpriv->browser->GetEncoding (currEnc);
    if (NS_FAILED (rv)) return;

    if (strcmp (currEnc.get(), encoding) != 0 ||
        encoding[0] == '\0' && !ephy_embed_has_automatic_encoding (embed))
    {
        rv = mpriv->browser->ForceEncoding (encoding);
        if (NS_FAILED (rv)) return;
    }

    gtk_moz_embed_reload (GTK_MOZ_EMBED (embed),
                  GTK_MOZ_EMBED_FLAG_RELOADCHARSETCHANGE);
}

static char *
impl_get_encoding (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    nsresult rv;
    nsEmbedCString encoding;

    rv = mpriv->browser->GetEncoding (encoding);

    if (NS_FAILED (rv) || !encoding.Length())
    {
        return NULL;
    }

    return g_strdup (encoding.get());
}

static gboolean
impl_has_automatic_encoding (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    nsresult rv;
    nsEmbedCString encoding;

    rv = mpriv->browser->GetForcedEncoding (encoding);

    if (NS_FAILED (rv) || !encoding.Length())
    {
        return TRUE;
    }

    return FALSE;
}

static gboolean
impl_has_modified_forms (EphyEmbed *embed)
{
    MozillaEmbedPrivate *mpriv = MOZILLA_EMBED(embed)->priv;
    nsresult rv;

    PRBool modified;
    rv = mpriv->browser->GetHasModifiedForms (&modified);

    return NS_SUCCEEDED (rv) ? modified : FALSE;
}

static void
mozilla_embed_location_changed_cb (GtkMozEmbed *embed, 
                   MozillaEmbed *membed)
{
    char *location;

    location = gtk_moz_embed_get_location (embed);
    g_signal_emit_by_name (membed, "ge_location", location);
    g_free (location);
}

static void
update_load_state (MozillaEmbed *membed, gint state)
{
    MozillaEmbedPrivate *priv = membed->priv;

    if (state & GTK_MOZ_EMBED_FLAG_IS_DOCUMENT &&
        state & (GTK_MOZ_EMBED_FLAG_START | GTK_MOZ_EMBED_FLAG_STOP))
    {
        g_signal_emit_by_name (membed, "ge-document-type",
                       priv->browser->GetDocumentType ());
    }

    if (state & GTK_MOZ_EMBED_FLAG_IS_NETWORK)
    {
        if (state & GTK_MOZ_EMBED_FLAG_START)
        {
            priv->load_state = MOZILLA_EMBED_LOAD_STARTED;
        }
        else if (state & GTK_MOZ_EMBED_FLAG_STOP)
        {
            priv->load_state = MOZILLA_EMBED_LOAD_STOPPED;
        }
    }
    else if (state & GTK_MOZ_EMBED_FLAG_START &&
             state & GTK_MOZ_EMBED_FLAG_IS_REQUEST)
    {
        if (priv->load_state == MOZILLA_EMBED_LOAD_REDIRECTING)
        {
            priv->load_state = MOZILLA_EMBED_LOAD_STARTED;
        }
        else if (priv->load_state != MOZILLA_EMBED_LOAD_LOADING)
        {
            priv->load_state = MOZILLA_EMBED_LOAD_LOADING;

            char *address;
            address = gtk_moz_embed_get_location (GTK_MOZ_EMBED (membed));
            g_signal_emit_by_name (membed, "ge_content_change", address);
            g_free (address);
        }
    }
    else if (state & GTK_MOZ_EMBED_FLAG_REDIRECTING &&
             priv->load_state == MOZILLA_EMBED_LOAD_STARTED)
    {
        priv->load_state = MOZILLA_EMBED_LOAD_REDIRECTING;
    }
}

static void
mozilla_embed_net_state_all_cb (GtkMozEmbed *embed, const char *aURI,
                                gint state, guint status, 
                MozillaEmbed *membed)
{
    EphyEmbedNetState estate = EPHY_EMBED_STATE_UNKNOWN;
    int i;

    struct
    {
        guint state;
        EphyEmbedNetState embed_state;
    }
    conversion_map [] =
    {
        { GTK_MOZ_EMBED_FLAG_START, EPHY_EMBED_STATE_START },
        { GTK_MOZ_EMBED_FLAG_STOP, EPHY_EMBED_STATE_STOP },
        { GTK_MOZ_EMBED_FLAG_REDIRECTING, EPHY_EMBED_STATE_REDIRECTING },
        { GTK_MOZ_EMBED_FLAG_TRANSFERRING, EPHY_EMBED_STATE_TRANSFERRING },
        { GTK_MOZ_EMBED_FLAG_NEGOTIATING, EPHY_EMBED_STATE_NEGOTIATING },
        { GTK_MOZ_EMBED_FLAG_IS_REQUEST, EPHY_EMBED_STATE_IS_REQUEST },
        { GTK_MOZ_EMBED_FLAG_IS_DOCUMENT, EPHY_EMBED_STATE_IS_DOCUMENT },
        { GTK_MOZ_EMBED_FLAG_IS_NETWORK, EPHY_EMBED_STATE_IS_NETWORK },
        { 0, EPHY_EMBED_STATE_UNKNOWN }
    };

    for (i = 0; conversion_map[i].state != 0; i++)
    {
        if (state & conversion_map[i].state)
        {
            estate = (EphyEmbedNetState) (estate | conversion_map[i].embed_state);  
        }
    }

    update_load_state (membed, state);
    
    g_signal_emit_by_name (membed, "ge_net_state", aURI, estate);
}

static gboolean
mozilla_embed_emit_mouse_signal (MozillaEmbed *embed,
                 gpointer dom_event, 
                 const char *signal_name)
{
    MozillaEmbedPrivate *mpriv = embed->priv;
    MozillaEmbedEvent *info;
    EventContext event_context;
    gint return_value = FALSE;
    nsresult rv;

    if (dom_event == NULL) return FALSE;

    nsCOMPtr<nsIDOMMouseEvent> ev = static_cast<nsIDOMMouseEvent*>(dom_event);
    NS_ENSURE_TRUE (ev, FALSE);
    nsCOMPtr<nsIDOMEvent> dev = do_QueryInterface (ev);
    NS_ENSURE_TRUE (dev, FALSE);

    info = mozilla_embed_event_new (NS_STATIC_CAST (gpointer, dev));

    event_context.Init (mpriv->browser);
        rv = event_context.GetMouseEventInfo (ev, MOZILLA_EMBED_EVENT (info));
    if (NS_FAILED (rv))
    {
        g_object_unref (info);
        return FALSE;
    }

    nsCOMPtr<nsIDOMDocument> domDoc;
    rv = event_context.GetTargetDocument (getter_AddRefs(domDoc));
    if (NS_SUCCEEDED (rv))
    {
        mpriv->browser->PushTargetDocument (domDoc);

        g_signal_emit_by_name (embed, signal_name, 
                       info, &return_value); 
        mpriv->browser->PopTargetDocument ();
    }

    g_object_unref (info);

    return return_value;
}

static gboolean
mozilla_embed_dom_mouse_click_cb (GtkMozEmbed *embed,
                  gpointer dom_event, 
                  MozillaEmbed *membed)
{
    return mozilla_embed_emit_mouse_signal (membed, dom_event,
                        "ge_dom_mouse_click");
}

static gboolean
mozilla_embed_dom_mouse_down_cb (GtkMozEmbed *embed, gpointer dom_event, 
                 MozillaEmbed *membed)
{
    return mozilla_embed_emit_mouse_signal (membed, dom_event,
                        "ge_dom_mouse_down");
}

static gint
mozilla_embed_dom_key_press_cb (GtkMozEmbed *embed,
                gpointer dom_event, 
                MozillaEmbed *membed)
{
    gint retval = FALSE;

    if (dom_event == NULL) return FALSE;

    nsCOMPtr<nsIDOMKeyEvent> ev = static_cast<nsIDOMKeyEvent*>(dom_event);
    NS_ENSURE_TRUE (ev, FALSE);

    if (!EventContext::CheckKeyPress (ev)) return FALSE;

    GdkEvent *event = gtk_get_current_event ();
    if (event == NULL) return FALSE; /* shouldn't happen! */

    g_return_val_if_fail (GDK_KEY_PRESS == event->type, FALSE);

    g_signal_emit_by_name (embed, "ge-search-key-press", event, &retval);

    gdk_event_free (event);

    return retval;
}

EphyEmbedChrome
_mozilla_embed_translate_chrome (GtkMozEmbedChromeFlags flags)
{
    static const struct
    {
        guint mozilla_flag;
        guint ephy_flag;
    }
    conversion_map [] =
    {
        { GTK_MOZ_EMBED_FLAG_MENUBARON, EPHY_EMBED_CHROME_MENUBAR },
        { GTK_MOZ_EMBED_FLAG_TOOLBARON, EPHY_EMBED_CHROME_TOOLBAR },
        { GTK_MOZ_EMBED_FLAG_STATUSBARON, EPHY_EMBED_CHROME_STATUSBAR },
        { GTK_MOZ_EMBED_FLAG_PERSONALTOOLBARON, EPHY_EMBED_CHROME_BOOKMARKSBAR },
    };

    guint mask = 0, i;

    for (i = 0; i < G_N_ELEMENTS (conversion_map); i++)
    {
        if (flags & conversion_map[i].mozilla_flag)
        {
            mask |= conversion_map[i].ephy_flag;
        }
    }

    return (EphyEmbedChrome) mask;
}

static void
mozilla_embed_new_window_cb (GtkMozEmbed *embed, 
                 GtkMozEmbed **newEmbed,
                 guint chrome_mask, 
                 MozillaEmbed *membed)
{
    GtkMozEmbedChromeFlags chrome = (GtkMozEmbedChromeFlags) chrome_mask;
    EphyEmbed *new_embed = NULL;
    GObject *single;
    EphyEmbedChrome mask;

    if (chrome & GTK_MOZ_EMBED_FLAG_OPENASCHROME)
    {
        *newEmbed = _mozilla_embed_new_xul_dialog ();
        return;
    }

    mask = _mozilla_embed_translate_chrome (chrome);

    single = ephy_embed_shell_get_embed_single (embed_shell);
    g_signal_emit_by_name (single, "new-window", embed, mask,
                   &new_embed);

    g_assert (new_embed != NULL);

    gtk_moz_embed_set_chrome_mask (GTK_MOZ_EMBED (new_embed), chrome);

    g_signal_emit_by_name (membed, "ge-new-window", new_embed);

    *newEmbed = GTK_MOZ_EMBED (new_embed);
}

static void
mozilla_embed_security_change_cb (GtkMozEmbed *embed, 
                  gpointer requestptr,
                  PRUint32 state,
                  MozillaEmbed *membed)
{
    g_signal_emit_by_name (membed, "ge_security_change",
                   mozilla_embed_security_level (state));
}

static EphyEmbedSecurityLevel
mozilla_embed_security_level (PRUint32 state)
{
    EphyEmbedSecurityLevel level;

    switch (state)
        {
        case nsIWebProgressListener::STATE_IS_INSECURE:
                level = EPHY_EMBED_STATE_IS_INSECURE;
                break;
        case nsIWebProgressListener::STATE_IS_BROKEN:
                level = EPHY_EMBED_STATE_IS_BROKEN;
                break;
        case nsIWebProgressListener::STATE_IS_SECURE|
             nsIWebProgressListener::STATE_SECURE_HIGH:
                level = EPHY_EMBED_STATE_IS_SECURE_HIGH;
                break;
        case nsIWebProgressListener::STATE_IS_SECURE|
             nsIWebProgressListener::STATE_SECURE_MED:
                level = EPHY_EMBED_STATE_IS_SECURE_MED;
                break;
        case nsIWebProgressListener::STATE_IS_SECURE|
             nsIWebProgressListener::STATE_SECURE_LOW:
                level = EPHY_EMBED_STATE_IS_SECURE_LOW;
                break;
        default:
                level = EPHY_EMBED_STATE_IS_UNKNOWN;
                break;
        }
    return level;
}

static void
ephy_embed_iface_init (EphyEmbedIface *iface)
{
    iface->load_url = impl_load_url; 
    iface->stop_load = impl_stop_load;
    iface->can_go_back = impl_can_go_back;
    iface->can_go_forward =impl_can_go_forward;
    iface->can_go_up = impl_can_go_up;
    iface->get_go_up_list = impl_get_go_up_list;
    iface->go_back = impl_go_back;
    iface->go_forward = impl_go_forward;
    iface->go_up = impl_go_up;
    iface->get_title = impl_get_title;
    iface->get_location = impl_get_location;
    iface->get_link_message = impl_get_link_message;
    iface->get_js_status = impl_get_js_status;
    iface->reload = impl_reload;
    iface->set_zoom = impl_set_zoom;
    iface->get_zoom = impl_get_zoom;
    iface->shistory_n_items = impl_shistory_n_items;
    iface->shistory_get_nth = impl_shistory_get_nth;
    iface->shistory_get_pos = impl_shistory_get_pos;
    iface->shistory_go_nth = impl_shistory_go_nth;
    iface->get_security_level = impl_get_security_level;
    iface->show_page_certificate = impl_show_page_certificate;
    iface->set_encoding = impl_set_encoding;
    iface->get_encoding = impl_get_encoding;
    iface->has_automatic_encoding = impl_has_automatic_encoding;
    iface->print = impl_print;
    iface->set_print_preview_mode = impl_set_print_preview_mode;
    iface->print_preview_n_pages = impl_print_preview_n_pages;
    iface->print_preview_navigate = impl_print_preview_navigate;
    iface->has_modified_forms = impl_has_modified_forms;
}

static void
xul_visibility_cb (GtkWidget *embed, gboolean visibility, GtkWidget *window)
{
    if (visibility)
    {
        gtk_widget_show (window);
    }
    else
    {
        gtk_widget_hide (window);
    }
}

static void
xul_size_to_cb (GtkWidget *embed, gint width, gint height, gpointer dummy)
{
    gtk_widget_set_size_request (embed, width, height);
}

static void
xul_new_window_cb (GtkMozEmbed *embed,
           GtkMozEmbed **retval, 
           guint chrome_mask,
           gpointer dummy)
{
        g_assert (chrome_mask & GTK_MOZ_EMBED_FLAG_OPENASCHROME);

        *retval = _mozilla_embed_new_xul_dialog ();
}

static void
xul_title_cb (GtkMozEmbed *embed,
          GtkWindow *window)
{
    char *title;

    title = gtk_moz_embed_get_title (embed);
    gtk_window_set_title (window, title);
    g_free (title);
}

GtkMozEmbed *
_mozilla_embed_new_xul_dialog (void)
{
    GtkWidget *window, *embed;

    g_object_ref (embed_shell);

    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    g_object_set_data_full (G_OBJECT (window), "EmbedShellRef",
                    embed_shell,
                (GDestroyNotify) g_object_unref);
    g_signal_connect_object (embed_shell, "prepare_close",
                 G_CALLBACK (gtk_widget_destroy), window,
                 (GConnectFlags) G_CONNECT_SWAPPED);

    embed = gtk_moz_embed_new ();
    gtk_widget_show (embed);
    gtk_container_add (GTK_CONTAINER (window), embed);

    g_signal_connect_object (embed, "destroy_browser",
                 G_CALLBACK (gtk_widget_destroy),
                 window, G_CONNECT_SWAPPED);
    g_signal_connect_object (embed, "visibility",
                 G_CALLBACK (xul_visibility_cb),
                 window, (GConnectFlags) 0);
    g_signal_connect_object (embed, "size_to",
                 G_CALLBACK (xul_size_to_cb),
                 NULL, (GConnectFlags) 0);
    g_signal_connect_object (embed, "new_window",
                 G_CALLBACK (xul_new_window_cb),
                 NULL, (GConnectFlags) 0);
    g_signal_connect_object (embed, "title",
                 G_CALLBACK (xul_title_cb),
                 window, (GConnectFlags) 0);

    return GTK_MOZ_EMBED (embed);
}