path: root/e-util/e-web-view.c

/*
 * e-web-view.c
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "e-web-view.h"

#include <config.h>
#include <glib/gi18n-lib.h>

#include <math.h>
#include <stdlib.h>
#include <string.h>

#include <pango/pango.h>

#include <camel/camel.h>
#include <libebackend/libebackend.h>

#include <libsoup/soup.h>

#include "e-alert-dialog.h"
#include "e-alert-sink.h"
#include "e-file-request.h"
#include "e-misc-utils.h"
#include "e-plugin-ui.h"
#include "e-popup-action.h"
#include "e-selectable.h"
#include "e-stock-request.h"

#define E_WEB_VIEW_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_WEB_VIEW, EWebViewPrivate))

typedef struct _AsyncContext AsyncContext;

struct _EWebViewPrivate {
    GtkUIManager *ui_manager;
    gchar *selected_uri;
    gchar *cursor_image_src;

    GQueue highlights;

    GtkAction *open_proxy;
    GtkAction *print_proxy;
    GtkAction *save_as_proxy;

    /* Lockdown Options */
    gboolean disable_printing;
    gboolean disable_save_to_disk;

    gboolean caret_mode;

    GSettings *font_settings;
    gulong font_name_changed_handler_id;
    gulong monospace_font_name_changed_handler_id;

    GSettings *aliasing_settings;
    gulong antialiasing_changed_handler_id;
};

struct _AsyncContext {
    EActivity *activity;
    GFile *destination;
    GInputStream *input_stream;
};

enum {
    PROP_0,
    PROP_CARET_MODE,
    PROP_COPY_TARGET_LIST,
    PROP_CURSOR_IMAGE_SRC,
    PROP_DISABLE_PRINTING,
    PROP_DISABLE_SAVE_TO_DISK,
    PROP_INLINE_SPELLING,
    PROP_MAGIC_LINKS,
    PROP_MAGIC_SMILEYS,
    PROP_OPEN_PROXY,
    PROP_PRINT_PROXY,
    PROP_SAVE_AS_PROXY,
    PROP_SELECTED_URI
};

enum {
    NEW_ACTIVITY,
    POPUP_EVENT,
    STATUS_MESSAGE,
    STOP_LOADING,
    UPDATE_ACTIONS,
    PROCESS_MAILTO,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];
static GOnce disable_webkit_3rd_party_plugins_once = G_ONCE_INIT;

static const gchar *ui =
"<ui>"
"  <popup name='context'>"
"    <menuitem action='copy-clipboard'/>"
"    <separator/>"
"    <placeholder name='custom-actions-1'>"
"      <menuitem action='open'/>"
"      <menuitem action='save-as'/>"
"      <menuitem action='http-open'/>"
"      <menuitem action='send-message'/>"
"      <menuitem action='print'/>"
"    </placeholder>"
"    <placeholder name='custom-actions-2'>"
"      <menuitem action='uri-copy'/>"
"      <menuitem action='mailto-copy'/>"
"      <menuitem action='image-copy'/>"
"      <menuitem action='image-save'/>"
"    </placeholder>"
"    <placeholder name='custom-actions-3'/>"
"    <separator/>"
"    <menuitem action='select-all'/>"
"    <placeholder name='inspect-menu' />"
"  </popup>"
"</ui>";

/* Forward Declarations */
static void e_web_view_alert_sink_init (EAlertSinkInterface *iface);
static void e_web_view_selectable_init (ESelectableInterface *iface);

G_DEFINE_TYPE_WITH_CODE (
    EWebView,
    e_web_view,
    WEBKIT_TYPE_WEB_VIEW,
    G_IMPLEMENT_INTERFACE (
        E_TYPE_EXTENSIBLE, NULL)
    G_IMPLEMENT_INTERFACE (
        E_TYPE_ALERT_SINK,
        e_web_view_alert_sink_init)
    G_IMPLEMENT_INTERFACE (
        E_TYPE_SELECTABLE,
        e_web_view_selectable_init))

static void
async_context_free (AsyncContext *async_context)
{
    g_clear_object (&async_context->activity);
    g_clear_object (&async_context->destination);
    g_clear_object (&async_context->input_stream);

    g_slice_free (AsyncContext, async_context);
}

static void
action_copy_clipboard_cb (GtkAction *action,
                          EWebView *web_view)
{
    e_web_view_copy_clipboard (web_view);
}

static void
action_http_open_cb (GtkAction *action,
                     EWebView *web_view)
{
    const gchar *uri;
    gpointer parent;

    parent = gtk_widget_get_toplevel (GTK_WIDGET (web_view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    uri = e_web_view_get_selected_uri (web_view);
    g_return_if_fail (uri != NULL);

    e_show_uri (parent, uri);
}

static void
action_mailto_copy_cb (GtkAction *action,
                       EWebView *web_view)
{
    CamelURL *curl;
    CamelInternetAddress *inet_addr;
    GtkClipboard *clipboard;
    const gchar *uri;
    gchar *text;

    uri = e_web_view_get_selected_uri (web_view);
    g_return_if_fail (uri != NULL);

    /* This should work because we checked it in update_actions(). */
    curl = camel_url_new (uri, NULL);
    g_return_if_fail (curl != NULL);

    inet_addr = camel_internet_address_new ();
    camel_address_decode (CAMEL_ADDRESS (inet_addr), curl->path);
    text = camel_address_format (CAMEL_ADDRESS (inet_addr));
    if (text == NULL || *text == '\0')
        text = g_strdup (uri + strlen ("mailto:"));

    g_object_unref (inet_addr);
    camel_url_free (curl);

    clipboard = gtk_clipboard_get (GDK_SELECTION_PRIMARY);
    gtk_clipboard_set_text (clipboard, text, -1);
    gtk_clipboard_store (clipboard);

    clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
    gtk_clipboard_set_text (clipboard, text, -1);
    gtk_clipboard_store (clipboard);

    g_free (text);
}

static void
action_select_all_cb (GtkAction *action,
                      EWebView *web_view)
{
    e_web_view_select_all (web_view);
}

static void
action_send_message_cb (GtkAction *action,
                        EWebView *web_view)
{
    const gchar *uri;
    gpointer parent;
    gboolean handled;

    parent = gtk_widget_get_toplevel (GTK_WIDGET (web_view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    uri = e_web_view_get_selected_uri (web_view);
    g_return_if_fail (uri != NULL);

    handled = FALSE;
    g_signal_emit (web_view, signals[PROCESS_MAILTO], 0, uri, &handled);

    if (!handled)
        e_show_uri (parent, uri);
}

static void
action_uri_copy_cb (GtkAction *action,
                    EWebView *web_view)
{
    GtkClipboard *clipboard;
    const gchar *uri;

    clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
    uri = e_web_view_get_selected_uri (web_view);
    g_return_if_fail (uri != NULL);

    gtk_clipboard_set_text (clipboard, uri, -1);
    gtk_clipboard_store (clipboard);
}

static void
action_image_copy_cb (GtkAction *action,
                      EWebView *web_view)
{
    e_web_view_cursor_image_copy (web_view);
}

static void
action_image_save_cb (GtkAction *action,
                      EWebView *web_view)
{
    e_web_view_cursor_image_save (web_view);
}

static GtkActionEntry uri_entries[] = {

    { "uri-copy",
      "edit-copy",
      N_("_Copy Link Location"),
      "<Control>c",
      N_("Copy the link to the clipboard"),
      G_CALLBACK (action_uri_copy_cb) }
};

static GtkActionEntry http_entries[] = {

    { "http-open",
      "emblem-web",
      N_("_Open Link in Browser"),
      NULL,
      N_("Open the link in a web browser"),
      G_CALLBACK (action_http_open_cb) }
};

static GtkActionEntry mailto_entries[] = {

    { "mailto-copy",
      "edit-copy",
      N_("_Copy Email Address"),
      "<Control>c",
      N_("Copy the email address to the clipboard"),
      G_CALLBACK (action_mailto_copy_cb) },

    { "send-message",
      "mail-message-new",
      N_("_Send New Message To..."),
      NULL,
      N_("Send a mail message to this address"),
      G_CALLBACK (action_send_message_cb) }
};

static GtkActionEntry image_entries[] = {

    { "image-copy",
      "edit-copy",
      N_("_Copy Image"),
      "<Control>c",
      N_("Copy the image to the clipboard"),
      G_CALLBACK (action_image_copy_cb) },

    { "image-save",
      "document-save",
      N_("Save _Image..."),
      "<Control>s",
      N_("Save the image to a file"),
      G_CALLBACK (action_image_save_cb) }
};

static GtkActionEntry selection_entries[] = {

    { "copy-clipboard",
      "edit-copy",
      N_("_Copy"),
      "<Control>c",
      N_("Copy the selection"),
      G_CALLBACK (action_copy_clipboard_cb) },
};

static GtkActionEntry standard_entries[] = {

    { "select-all",
      "edit-select-all",
      N_("Select _All"),
      NULL,
      N_("Select all text and images"),
      G_CALLBACK (action_select_all_cb) }
};

static void
web_view_init_web_settings (WebKitWebView *web_view)
{
    WebKitWebSettings *web_settings;
    GObjectClass *class;
    GParamSpec *pspec;

    web_settings = webkit_web_settings_new ();

    g_object_set (
        G_OBJECT (web_settings),
        "enable-frame-flattening", TRUE,
        "enable-java-applet", FALSE,
        "enable-html5-database", FALSE,
        "enable-html5-local-storage", FALSE,
        "enable-offline-web-application-cache", FALSE,
        "enable-site-specific-quirks", TRUE,
        "enable-scripts", FALSE,
        NULL);

    /* This property was introduced in WebKitGTK 2.0,
     * so check for it and enable it if it's present. */
    class = G_OBJECT_GET_CLASS (web_settings);
    pspec = g_object_class_find_property (
        class, "respect-image-orientation");
    if (pspec != NULL) {
        g_object_set (
            G_OBJECT (web_settings),
            pspec->name, TRUE, NULL);
    }

    g_object_bind_property (
        web_settings, "enable-caret-browsing",
        web_view, "caret-mode",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);

    webkit_web_view_set_settings (web_view, web_settings);

    g_object_unref (web_settings);
}

static void
web_view_menu_item_select_cb (EWebView *web_view,
                              GtkWidget *widget)
{
    GtkAction *action;
    GtkActivatable *activatable;
    const gchar *tooltip;

    activatable = GTK_ACTIVATABLE (widget);
    action = gtk_activatable_get_related_action (activatable);
    tooltip = gtk_action_get_tooltip (action);

    if (tooltip == NULL)
        return;

    e_web_view_status_message (web_view, tooltip);
}

static void
web_view_update_document_highlights (EWebView *web_view)
{
    WebKitWebView *webkit_web_view;
    GList *head, *link;

    webkit_web_view = WEBKIT_WEB_VIEW (web_view);

    head = g_queue_peek_head_link (&web_view->priv->highlights);

    for (link = head; link != NULL; link = g_list_next (link))
        webkit_web_view_mark_text_matches (
            webkit_web_view, link->data, FALSE, 0);

    webkit_web_view_set_highlight_text_matches (webkit_web_view, TRUE);
}

static void
web_view_menu_item_deselect_cb (EWebView *web_view)
{
    e_web_view_status_message (web_view, NULL);
}

static void
web_view_connect_proxy_cb (EWebView *web_view,
                           GtkAction *action,
                           GtkWidget *proxy)
{
    if (!GTK_IS_MENU_ITEM (proxy))
        return;

    g_signal_connect_swapped (
        proxy, "select",
        G_CALLBACK (web_view_menu_item_select_cb), web_view);

    g_signal_connect_swapped (
        proxy, "deselect",
        G_CALLBACK (web_view_menu_item_deselect_cb), web_view);
}

static gboolean
web_view_context_menu_cb (WebKitWebView *webkit_web_view,
                          GtkWidget *default_menu,
                          WebKitHitTestResult *hit_test_result,
                          gboolean triggered_with_keyboard)
{
    WebKitHitTestResultContext context;
    EWebView *web_view;
    gboolean event_handled = FALSE;
    gchar *link_uri = NULL;

    web_view = E_WEB_VIEW (webkit_web_view);

    g_free (web_view->priv->cursor_image_src);
    web_view->priv->cursor_image_src = NULL;

    if (hit_test_result == NULL)
        return FALSE;

    g_object_get (hit_test_result, "context", &context, NULL);

    if (context & WEBKIT_HIT_TEST_RESULT_CONTEXT_IMAGE) {
        gchar *image_uri = NULL;

        g_object_get (hit_test_result, "image-uri", &image_uri, NULL);

        if (image_uri != NULL) {
            g_free (web_view->priv->cursor_image_src);
            web_view->priv->cursor_image_src = image_uri;
        }
    }

    if (context & WEBKIT_HIT_TEST_RESULT_CONTEXT_LINK)
        g_object_get (hit_test_result, "link-uri", &link_uri, NULL);

    g_signal_emit (
        web_view,
        signals[POPUP_EVENT], 0,
        link_uri, &event_handled);

    g_free (link_uri);

    return event_handled;
}

static GtkWidget *
web_view_create_plugin_widget_cb (EWebView *web_view,
                                  const gchar *mime_type,
                                  const gchar *uri,
                                  GHashTable *param)
{
    EWebViewClass *class;

    /* XXX WebKitWebView does not provide a class method for
     *     this signal, so we do so we can override the default
     *     behavior from subclasses for special URI types. */

    class = E_WEB_VIEW_GET_CLASS (web_view);
    g_return_val_if_fail (class->create_plugin_widget != NULL, NULL);

    return class->create_plugin_widget (web_view, mime_type, uri, param);
}

static void
web_view_hovering_over_link_cb (EWebView *web_view,
                                const gchar *title,
                                const gchar *uri)
{
    EWebViewClass *class;

    /* XXX WebKitWebView does not provide a class method for
     *     this signal, so we do so we can override the default
     *     behavior from subclasses for special URI types. */

    class = E_WEB_VIEW_GET_CLASS (web_view);
    g_return_if_fail (class->hovering_over_link != NULL);

    class->hovering_over_link (web_view, title, uri);
}

static gboolean
web_view_navigation_policy_decision_requested_cb (EWebView *web_view,
                                                  WebKitWebFrame *frame,
                                                  WebKitNetworkRequest *request,
                                                  WebKitWebNavigationAction *navigation_action,
                                                  WebKitWebPolicyDecision *policy_decision)
{
    EWebViewClass *class;
    WebKitWebNavigationReason reason;
    const gchar *uri;

    reason = webkit_web_navigation_action_get_reason (navigation_action);
    if (reason != WEBKIT_WEB_NAVIGATION_REASON_LINK_CLICKED)
        return FALSE;

    /* XXX WebKitWebView does not provide a class method for
     *     this signal, so we do so we can override the default
     *     behavior from subclasses for special URI types. */

    class = E_WEB_VIEW_GET_CLASS (web_view);
    g_return_val_if_fail (class->link_clicked != NULL, FALSE);

    webkit_web_policy_decision_ignore (policy_decision);

    uri = webkit_network_request_get_uri (request);

    class->link_clicked (web_view, uri);

    return TRUE;
}

static void
style_updated_cb (EWebView *web_view)
{
    GdkRGBA color;
    gchar *color_value;
    gchar *style;
    GtkStateFlags state_flags;
    GtkStyleContext *style_context;
    GtkWidgetPath *widget_path;

    state_flags = gtk_widget_get_state_flags (GTK_WIDGET (web_view));
    style_context = gtk_style_context_new ();
    widget_path = gtk_widget_path_new ();
    gtk_widget_path_append_type (widget_path, GTK_TYPE_WINDOW);
    gtk_style_context_set_path (style_context, widget_path);
    gtk_style_context_add_class (style_context, GTK_STYLE_CLASS_ENTRY);

    gtk_style_context_get_background_color (
        style_context,
        state_flags | GTK_STATE_FLAG_FOCUSED,
        &color);
    color_value = g_strdup_printf ("#%06x", e_rgba_to_value (&color));
    style = g_strconcat ("background-color: ", color_value, ";", NULL);

    e_web_view_add_css_rule_into_style_sheet (
        web_view,
        "-e-web-view-css-sheet",
        ".-e-web-view-background-color",
        style);

    g_free (color_value);
    g_free (style);

    gtk_style_context_get_color (
        style_context,
        state_flags | GTK_STATE_FLAG_FOCUSED,
        &color);
    color_value = g_strdup_printf ("#%06x", e_rgba_to_value (&color));
    style = g_strconcat ("color: ", color_value, ";", NULL);

    e_web_view_add_css_rule_into_style_sheet (
        web_view,
        "-e-web-view-css-sheet",
        ".-e-web-view-text-color",
        style);

    gtk_widget_path_free (widget_path);
    g_object_unref (style_context);

    g_free (color_value);
    g_free (style);
}

static void
web_view_load_status_changed_cb (WebKitWebView *webkit_web_view,
                                 GParamSpec *pspec,
                                 gpointer user_data)
{
    WebKitLoadStatus status;
    EWebView *web_view;

    web_view = E_WEB_VIEW (webkit_web_view);

    status = webkit_web_view_get_load_status (webkit_web_view);

    if (status != WEBKIT_LOAD_FINISHED)
        return;

    style_updated_cb (web_view);

    web_view_update_document_highlights (web_view);

    /* Workaround webkit bug:
     * https://bugs.webkit.org/show_bug.cgi?id=89553 */
    if (webkit_web_view_get_zoom_level (WEBKIT_WEB_VIEW (web_view)) > 0.9999) {
        e_web_view_zoom_out (web_view);
        e_web_view_zoom_in (web_view);
    } else {
        e_web_view_zoom_in (web_view);
        e_web_view_zoom_out (web_view);
    }
}

static void
web_view_set_property (GObject *object,
                       guint property_id,
                       const GValue *value,
                       GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CARET_MODE:
            e_web_view_set_caret_mode (
                E_WEB_VIEW (object),
                g_value_get_boolean (value));
            return;

        case PROP_CURSOR_IMAGE_SRC:
            e_web_view_set_cursor_image_src (
                E_WEB_VIEW (object),
                g_value_get_string (value));
            return;

        case PROP_DISABLE_PRINTING:
            e_web_view_set_disable_printing (
                E_WEB_VIEW (object),
                g_value_get_boolean (value));
            return;

        case PROP_DISABLE_SAVE_TO_DISK:
            e_web_view_set_disable_save_to_disk (
                E_WEB_VIEW (object),
                g_value_get_boolean (value));
            return;

        case PROP_INLINE_SPELLING:
            e_web_view_set_inline_spelling (
                E_WEB_VIEW (object),
                g_value_get_boolean (value));
            return;

        case PROP_MAGIC_LINKS:
            e_web_view_set_magic_links (
                E_WEB_VIEW (object),
                g_value_get_boolean (value));
            return;

        case PROP_MAGIC_SMILEYS:
            e_web_view_set_magic_smileys (
                E_WEB_VIEW (object),
                g_value_get_boolean (value));
            return;

        case PROP_OPEN_PROXY:
            e_web_view_set_open_proxy (
                E_WEB_VIEW (object),
                g_value_get_object (value));
            return;

        case PROP_PRINT_PROXY:
            e_web_view_set_print_proxy (
                E_WEB_VIEW (object),
                g_value_get_object (value));
            return;

        case PROP_SAVE_AS_PROXY:
            e_web_view_set_save_as_proxy (
                E_WEB_VIEW (object),
                g_value_get_object (value));
            return;

        case PROP_SELECTED_URI:
            e_web_view_set_selected_uri (
                E_WEB_VIEW (object),
                g_value_get_string (value));
            return;
    }
    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
web_view_get_property (GObject *object,
                       guint property_id,
                       GValue *value,
                       GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CARET_MODE:
            g_value_set_boolean (
                value, e_web_view_get_caret_mode (
                E_WEB_VIEW (object)));
            return;

        case PROP_CURSOR_IMAGE_SRC:
            g_value_set_string (
                value, e_web_view_get_cursor_image_src (
                E_WEB_VIEW (object)));
            return;

        case PROP_DISABLE_PRINTING:
            g_value_set_boolean (
                value, e_web_view_get_disable_printing (
                E_WEB_VIEW (object)));
            return;

        case PROP_DISABLE_SAVE_TO_DISK:
            g_value_set_boolean (
                value, e_web_view_get_disable_save_to_disk (
                E_WEB_VIEW (object)));
            return;

        case PROP_INLINE_SPELLING:
            g_value_set_boolean (
                value, e_web_view_get_inline_spelling (
                E_WEB_VIEW (object)));
            return;

        case PROP_MAGIC_LINKS:
            g_value_set_boolean (
                value, e_web_view_get_magic_links (
                E_WEB_VIEW (object)));
            return;

        case PROP_MAGIC_SMILEYS:
            g_value_set_boolean (
                value, e_web_view_get_magic_smileys (
                E_WEB_VIEW (object)));
            return;

        case PROP_OPEN_PROXY:
            g_value_set_object (
                value, e_web_view_get_open_proxy (
                E_WEB_VIEW (object)));
            return;

        case PROP_PRINT_PROXY:
            g_value_set_object (
                value, e_web_view_get_print_proxy (
                E_WEB_VIEW (object)));
            return;

        case PROP_SAVE_AS_PROXY:
            g_value_set_object (
                value, e_web_view_get_save_as_proxy (
                E_WEB_VIEW (object)));
            return;

        case PROP_SELECTED_URI:
            g_value_set_string (
                value, e_web_view_get_selected_uri (
                E_WEB_VIEW (object)));
            return;

    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
web_view_dispose (GObject *object)
{
    EWebViewPrivate *priv;

    priv = E_WEB_VIEW_GET_PRIVATE (object);

    if (priv->font_name_changed_handler_id > 0) {
        g_signal_handler_disconnect (
            priv->font_settings,
            priv->font_name_changed_handler_id);
        priv->font_name_changed_handler_id = 0;
    }

    if (priv->monospace_font_name_changed_handler_id > 0) {
        g_signal_handler_disconnect (
            priv->font_settings,
            priv->monospace_font_name_changed_handler_id);
        priv->monospace_font_name_changed_handler_id = 0;
    }

    if (priv->antialiasing_changed_handler_id > 0) {
        g_signal_handler_disconnect (
            priv->aliasing_settings,
            priv->antialiasing_changed_handler_id);
        priv->antialiasing_changed_handler_id = 0;
    }

    g_clear_object (&priv->ui_manager);
    g_clear_object (&priv->open_proxy);
    g_clear_object (&priv->print_proxy);
    g_clear_object (&priv->save_as_proxy);
    g_clear_object (&priv->aliasing_settings);
    g_clear_object (&priv->font_settings);

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_web_view_parent_class)->dispose (object);
}

static void
web_view_finalize (GObject *object)
{
    EWebViewPrivate *priv;

    priv = E_WEB_VIEW_GET_PRIVATE (object);

    g_free (priv->selected_uri);
    g_free (priv->cursor_image_src);

    while (!g_queue_is_empty (&priv->highlights))
        g_free (g_queue_pop_head (&priv->highlights));

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (e_web_view_parent_class)->finalize (object);
}

static void
web_view_constructed (GObject *object)
{
#ifndef G_OS_WIN32
    GSettings *settings;

    settings = g_settings_new ("org.gnome.desktop.lockdown");

    g_settings_bind (
        settings, "disable-printing",
        object, "disable-printing",
        G_SETTINGS_BIND_GET);

    g_settings_bind (
        settings, "disable-save-to-disk",
        object, "disable-save-to-disk",
        G_SETTINGS_BIND_GET);

    g_object_unref (settings);
#endif

    e_extensible_load_extensions (E_EXTENSIBLE (object));

    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (e_web_view_parent_class)->constructed (object);
}

static gboolean
web_view_scroll_event (GtkWidget *widget,
                       GdkEventScroll *event)
{
    if (event->state & GDK_CONTROL_MASK) {
        GdkScrollDirection direction = event->direction;

        if (direction == GDK_SCROLL_SMOOTH) {
            static gdouble total_delta_y = 0.0;

            total_delta_y += event->delta_y;

            if (total_delta_y >= 1.0) {
                total_delta_y = 0.0;
                direction = GDK_SCROLL_DOWN;
            } else if (total_delta_y <= -1.0) {
                total_delta_y = 0.0;
                direction = GDK_SCROLL_UP;
            } else {
                return FALSE;
            }
        }

        switch (direction) {
            case GDK_SCROLL_UP:
                e_web_view_zoom_in (E_WEB_VIEW (widget));
                return TRUE;
            case GDK_SCROLL_DOWN:
                e_web_view_zoom_out (E_WEB_VIEW (widget));
                return TRUE;
            default:
                break;
        }
    }

    return FALSE;
}

static gboolean
web_view_drag_motion (GtkWidget *widget,
                      GdkDragContext *context,
                      gint x,
                      gint y,
                      guint time_)
{
    return FALSE;
}

static GtkWidget *
web_view_create_plugin_widget (EWebView *web_view,
                               const gchar *mime_type,
                               const gchar *uri,
                               GHashTable *param)
{
    GtkWidget *widget = NULL;

    if (g_strcmp0 (mime_type, "image/x-themed-icon") == 0) {
        GtkIconTheme *icon_theme;
        GdkPixbuf *pixbuf;
        gpointer data;
        glong size = 0;
        GError *error = NULL;

        icon_theme = gtk_icon_theme_get_default ();

        if (size == 0) {
            data = g_hash_table_lookup (param, "width");
            if (data != NULL)
                size = MAX (size, strtol (data, NULL, 10));
        }

        if (size == 0) {
            data = g_hash_table_lookup (param, "height");
            if (data != NULL)
                size = MAX (size, strtol (data, NULL, 10));
        }

        if (size == 0)
            size = 32;  /* arbitrary default */

        pixbuf = gtk_icon_theme_load_icon (
            icon_theme, uri, size, 0, &error);
        if (pixbuf != NULL) {
            widget = gtk_image_new_from_pixbuf (pixbuf);
            g_object_unref (pixbuf);
        } else if (error != NULL) {
            g_warning ("%s", error->message);
            g_error_free (error);
        }
    }

    return widget;
}

static void
web_view_hovering_over_link (EWebView *web_view,
                             const gchar *title,
                             const gchar *uri)
{
    CamelInternetAddress *address;
    CamelURL *curl;
    const gchar *format = NULL;
    gchar *message = NULL;
    gchar *who;

    if (uri == NULL || *uri == '\0')
        goto exit;

    if (g_str_has_prefix (uri, "mailto:"))
        format = _("Click to mail %s");
    else if (g_str_has_prefix (uri, "callto:"))
        format = _("Click to call %s");
    else if (g_str_has_prefix (uri, "h323:"))
        format = _("Click to call %s");
    else if (g_str_has_prefix (uri, "sip:"))
        format = _("Click to call %s");
    else if (g_str_has_prefix (uri, "##"))
        message = g_strdup (_("Click to hide/unhide addresses"));
    else
        message = g_strdup_printf (_("Click to open %s"), uri);

    if (format == NULL)
        goto exit;

    /* XXX Use something other than Camel here.  Surely
     *     there's other APIs around that can do this. */
    curl = camel_url_new (uri, NULL);
    address = camel_internet_address_new ();
    camel_address_decode (CAMEL_ADDRESS (address), curl->path);
    who = camel_address_format (CAMEL_ADDRESS (address));
    g_object_unref (address);
    camel_url_free (curl);

    if (who == NULL)
        who = g_strdup (strchr (uri, ':') + 1);

    message = g_strdup_printf (format, who);

    g_free (who);

exit:
    e_web_view_status_message (web_view, message);

    g_free (message);
}

static void
web_view_link_clicked (EWebView *web_view,
                       const gchar *uri)
{
    gpointer parent;

    if (uri && g_ascii_strncasecmp (uri, "mailto:", 7) == 0) {
        gboolean handled = FALSE;

        g_signal_emit (
            web_view, signals[PROCESS_MAILTO], 0, uri, &handled);

        if (handled)
            return;
    }

    parent = gtk_widget_get_toplevel (GTK_WIDGET (web_view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    e_show_uri (parent, uri);
}

static void
web_view_load_string (EWebView *web_view,
                      const gchar *string)
{
    if (string == NULL)
        string = "";

    webkit_web_view_load_string (
        WEBKIT_WEB_VIEW (web_view),
        string, "text/html", "UTF-8", "evo-file:///");
}

static void
web_view_load_uri (EWebView *web_view,
                   const gchar *uri)
{
    if (uri == NULL)
        uri = "about:blank";

    webkit_web_view_load_uri (WEBKIT_WEB_VIEW (web_view), uri);
}

static gchar *
web_view_redirect_uri (EWebView *web_view,
                       const gchar *uri)
{
    return g_strdup (uri);
}

static gchar *
web_view_suggest_filename (EWebView *web_view,
                           const gchar *uri)
{
    const gchar *cp;

    /* Try to derive a filename from the last path segment. */

    cp = strrchr (uri, '/');
    if (cp != NULL) {
        if (strchr (cp, '?') == NULL)
            cp++;
        else
            cp = NULL;
    }

    return g_strdup (cp);
}

static gboolean
web_view_popup_event (EWebView *web_view,
                      const gchar *uri)
{
    e_web_view_set_selected_uri (web_view, uri);
    e_web_view_show_popup_menu (web_view);

    return TRUE;
}

static void
web_view_stop_loading (EWebView *web_view)
{
    webkit_web_view_stop_loading (WEBKIT_WEB_VIEW (web_view));
}

static void
web_view_update_actions (EWebView *web_view)
{
    GtkActionGroup *action_group;
    gboolean can_copy;
    gboolean scheme_is_http = FALSE;
    gboolean scheme_is_mailto = FALSE;
    gboolean uri_is_valid = FALSE;
    gboolean visible;
    const gchar *cursor_image_src;
    const gchar *group_name;
    const gchar *uri;

    uri = e_web_view_get_selected_uri (web_view);
    can_copy = webkit_web_view_can_copy_clipboard (WEBKIT_WEB_VIEW (web_view));
    cursor_image_src = e_web_view_get_cursor_image_src (web_view);

    /* Parse the URI early so we know if the actions will work. */
    if (uri != NULL) {
        CamelURL *curl;

        curl = camel_url_new (uri, NULL);
        uri_is_valid = (curl != NULL);
        camel_url_free (curl);

        scheme_is_http =
            (g_ascii_strncasecmp (uri, "http:", 5) == 0) ||
            (g_ascii_strncasecmp (uri, "https:", 6) == 0);

        scheme_is_mailto =
            (g_ascii_strncasecmp (uri, "mailto:", 7) == 0);
    }

    /* Allow copying the URI even if it's malformed. */
    group_name = "uri";
    visible = (uri != NULL) && !scheme_is_mailto;
    action_group = e_web_view_get_action_group (web_view, group_name);
    gtk_action_group_set_visible (action_group, visible);

    group_name = "http";
    visible = uri_is_valid && scheme_is_http;
    action_group = e_web_view_get_action_group (web_view, group_name);
    gtk_action_group_set_visible (action_group, visible);

    group_name = "mailto";
    visible = uri_is_valid && scheme_is_mailto;
    action_group = e_web_view_get_action_group (web_view, group_name);
    gtk_action_group_set_visible (action_group, visible);

    group_name = "image";
    visible = (cursor_image_src != NULL);
    action_group = e_web_view_get_action_group (web_view, group_name);
    gtk_action_group_set_visible (action_group, visible);

    group_name = "selection";
    visible = can_copy;
    action_group = e_web_view_get_action_group (web_view, group_name);
    gtk_action_group_set_visible (action_group, visible);

    group_name = "standard";
    visible = (uri == NULL);
    action_group = e_web_view_get_action_group (web_view, group_name);
    gtk_action_group_set_visible (action_group, visible);

    group_name = "lockdown-printing";
    visible = (uri == NULL) && !web_view->priv->disable_printing;
    action_group = e_web_view_get_action_group (web_view, group_name);
    gtk_action_group_set_visible (action_group, visible);

    group_name = "lockdown-save-to-disk";
    visible = (uri == NULL) && !web_view->priv->disable_save_to_disk;
    action_group = e_web_view_get_action_group (web_view, group_name);
    gtk_action_group_set_visible (action_group, visible);
}

static void
web_view_submit_alert (EAlertSink *alert_sink,
                       EAlert *alert)
{
    EWebView *web_view;
    GtkWidget *dialog;
    GString *buffer;
    const gchar *icon_name = NULL;
    const gchar *primary_text;
    const gchar *secondary_text;
    gpointer parent;

    web_view = E_WEB_VIEW (alert_sink);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (web_view));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    switch (e_alert_get_message_type (alert)) {
        case GTK_MESSAGE_INFO:
            icon_name = "dialog-information";
            break;

        case GTK_MESSAGE_WARNING:
            icon_name = "dialog-warning";
            break;

        case GTK_MESSAGE_ERROR:
            icon_name = "dialog-error";
            break;

        default:
            dialog = e_alert_dialog_new (parent, alert);
            gtk_dialog_run (GTK_DIALOG (dialog));
            gtk_widget_destroy (dialog);
            return;
    }

    /* Primary text is required. */
    primary_text = e_alert_get_primary_text (alert);
    g_return_if_fail (primary_text != NULL);

    /* Secondary text is optional. */
    secondary_text = e_alert_get_secondary_text (alert);
    if (secondary_text == NULL)
        secondary_text = "";

    buffer = g_string_sized_new (512);

    g_string_append (
        buffer,
        "<html>"
        "<head>"
        "<meta http-equiv=\"content-type\""
        " content=\"text/html; charset=utf-8\">"
        "</head>"
        "<body>");

    g_string_append (
        buffer,
        "<table bgcolor='#000000' width='100%'"
        " cellpadding='1' cellspacing='0'>"
        "<tr>"
        "<td>"
        "<table bgcolor='#dddddd' width='100%' cellpadding='6'>"
        "<tr>");

    g_string_append_printf (
        buffer,
        "<tr>"
        "<td valign='top'>"
        "<img src='gtk-stock://%s/?size=%d'/>"
        "</td>"
        "<td align='left' width='100%%'>"
        "<h3>%s</h3>"
        "%s"
        "</td>"
        "</tr>",
        icon_name,
        GTK_ICON_SIZE_DIALOG,
        primary_text,
        secondary_text);

    g_string_append (
        buffer,
        "</table>"
        "</td>"
        "</tr>"
        "</table>"
        "</body>"
        "</html>");

    e_web_view_load_string (web_view, buffer->str);

    g_string_free (buffer, TRUE);
}

static void
web_view_selectable_update_actions (ESelectable *selectable,
                                    EFocusTracker *focus_tracker,
                                    GdkAtom *clipboard_targets,
                                    gint n_clipboard_targets)
{
    WebKitWebView *web_view;
    GtkAction *action;
    gboolean sensitive;
    const gchar *tooltip;

    web_view = WEBKIT_WEB_VIEW (selectable);

    action = e_focus_tracker_get_cut_clipboard_action (focus_tracker);
    sensitive = webkit_web_view_can_cut_clipboard (web_view);
    tooltip = _("Cut the selection");
    gtk_action_set_sensitive (action, sensitive);
    gtk_action_set_tooltip (action, tooltip);

    action = e_focus_tracker_get_copy_clipboard_action (focus_tracker);
    sensitive = webkit_web_view_can_copy_clipboard (web_view);
    tooltip = _("Copy the selection");
    gtk_action_set_sensitive (action, sensitive);
    gtk_action_set_tooltip (action, tooltip);

    action = e_focus_tracker_get_paste_clipboard_action (focus_tracker);
    sensitive = webkit_web_view_can_paste_clipboard (web_view);
    tooltip = _("Paste the clipboard");
    gtk_action_set_sensitive (action, sensitive);
    gtk_action_set_tooltip (action, tooltip);

    action = e_focus_tracker_get_select_all_action (focus_tracker);
    sensitive = TRUE;
    tooltip = _("Select all text and images");
    gtk_action_set_sensitive (action, sensitive);
    gtk_action_set_tooltip (action, tooltip);
}

static void
web_view_selectable_cut_clipboard (ESelectable *selectable)
{
    e_web_view_cut_clipboard (E_WEB_VIEW (selectable));
}

static void
web_view_selectable_copy_clipboard (ESelectable *selectable)
{
    e_web_view_copy_clipboard (E_WEB_VIEW (selectable));
}

static void
web_view_selectable_paste_clipboard (ESelectable *selectable)
{
    e_web_view_paste_clipboard (E_WEB_VIEW (selectable));
}

static void
web_view_selectable_select_all (ESelectable *selectable)
{
    e_web_view_select_all (E_WEB_VIEW (selectable));
}

static gpointer
web_view_disable_webkit_3rd_party_plugins (gpointer unused)
{
    WebKitWebPluginDatabase *database;
    GSList *installed_plugins, *iterator;

    database = webkit_get_web_plugin_database ();

    if (!database)
        return NULL;

    installed_plugins = webkit_web_plugin_database_get_plugins (database);

    if (!installed_plugins)
        return NULL;

    for (iterator = installed_plugins; iterator; iterator = iterator->next)
        webkit_web_plugin_set_enabled (iterator->data, FALSE);

    webkit_web_plugin_database_plugins_list_free (installed_plugins);

    return NULL;
}

static void
e_web_view_class_init (EWebViewClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;

    g_type_class_add_private (class, sizeof (EWebViewPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = web_view_set_property;
    object_class->get_property = web_view_get_property;
    object_class->dispose = web_view_dispose;
    object_class->finalize = web_view_finalize;
    object_class->constructed = web_view_constructed;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->scroll_event = web_view_scroll_event;
    widget_class->drag_motion = web_view_drag_motion;

    class->create_plugin_widget = web_view_create_plugin_widget;
    class->hovering_over_link = web_view_hovering_over_link;
    class->link_clicked = web_view_link_clicked;
    class->load_string = web_view_load_string;
    class->load_uri = web_view_load_uri;
    class->redirect_uri = web_view_redirect_uri;
    class->suggest_filename = web_view_suggest_filename;
    class->popup_event = web_view_popup_event;
    class->stop_loading = web_view_stop_loading;
    class->update_actions = web_view_update_actions;

    g_object_class_install_property (
        object_class,
        PROP_CARET_MODE,
        g_param_spec_boolean (
            "caret-mode",
            "Caret Mode",
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_CURSOR_IMAGE_SRC,
        g_param_spec_string (
            "cursor-image-src",
            "Image source uri at the mouse cursor",
            NULL,
            NULL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_DISABLE_PRINTING,
        g_param_spec_boolean (
            "disable-printing",
            "Disable Printing",
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    g_object_class_install_property (
        object_class,
        PROP_DISABLE_SAVE_TO_DISK,
        g_param_spec_boolean (
            "disable-save-to-disk",
            "Disable Save-to-Disk",
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    g_object_class_install_property (
        object_class,
        PROP_INLINE_SPELLING,
        g_param_spec_boolean (
            "inline-spelling",
            "Inline Spelling",
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_MAGIC_LINKS,
        g_param_spec_boolean (
            "magic-links",
            "Magic Links",
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_MAGIC_SMILEYS,
        g_param_spec_boolean (
            "magic-smileys",
            "Magic Smileys",
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_OPEN_PROXY,
        g_param_spec_object (
            "open-proxy",
            "Open Proxy",
            NULL,
            GTK_TYPE_ACTION,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_PRINT_PROXY,
        g_param_spec_object (
            "print-proxy",
            "Print Proxy",
            NULL,
            GTK_TYPE_ACTION,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SAVE_AS_PROXY,
        g_param_spec_object (
            "save-as-proxy",
            "Save As Proxy",
            NULL,
            GTK_TYPE_ACTION,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SELECTED_URI,
        g_param_spec_string (
            "selected-uri",
            "Selected URI",
            NULL,
            NULL,
            G_PARAM_READWRITE));

    signals[NEW_ACTIVITY] = g_signal_new (
        "new-activity",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EWebViewClass, new_activity),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_ACTIVITY);

    signals[POPUP_EVENT] = g_signal_new (
        "popup-event",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EWebViewClass, popup_event),
        g_signal_accumulator_true_handled, NULL,
        e_marshal_BOOLEAN__STRING,
        G_TYPE_BOOLEAN, 1, G_TYPE_STRING);

    signals[STATUS_MESSAGE] = g_signal_new (
        "status-message",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EWebViewClass, status_message),
        NULL, NULL,
        g_cclosure_marshal_VOID__STRING,
        G_TYPE_NONE, 1,
        G_TYPE_STRING);

    signals[STOP_LOADING] = g_signal_new (
        "stop-loading",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EWebViewClass, stop_loading),
        NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);

    signals[UPDATE_ACTIONS] = g_signal_new (
        "update-actions",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EWebViewClass, update_actions),
        NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);

    /* return TRUE when a signal handler processed the mailto URI */
    signals[PROCESS_MAILTO] = g_signal_new (
        "process-mailto",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EWebViewClass, process_mailto),
        NULL, NULL,
        e_marshal_BOOLEAN__STRING,
        G_TYPE_BOOLEAN, 1, G_TYPE_STRING);

    webkit_set_cache_model (WEBKIT_CACHE_MODEL_DOCUMENT_VIEWER);
    webkit_set_default_web_database_quota (0);
    webkit_application_cache_set_maximum_size (0);
}

static void
e_web_view_alert_sink_init (EAlertSinkInterface *iface)
{
    iface->submit_alert = web_view_submit_alert;
}

static void
e_web_view_selectable_init (ESelectableInterface *iface)
{
    iface->update_actions = web_view_selectable_update_actions;
    iface->cut_clipboard = web_view_selectable_cut_clipboard;
    iface->copy_clipboard = web_view_selectable_copy_clipboard;
    iface->paste_clipboard = web_view_selectable_paste_clipboard;
    iface->select_all = web_view_selectable_select_all;
}

static void
e_web_view_init (EWebView *web_view)
{
    GtkUIManager *ui_manager;
    GtkActionGroup *action_group;
    EPopupAction *popup_action;
    GSettingsSchema *settings_schema;
    GSettings *settings;
    const gchar *domain = GETTEXT_PACKAGE;
    const gchar *id;
    gulong handler_id;
    GError *error = NULL;

    g_once (
        &disable_webkit_3rd_party_plugins_once,
        web_view_disable_webkit_3rd_party_plugins, NULL);

    web_view->priv = E_WEB_VIEW_GET_PRIVATE (web_view);

    /* XXX No WebKitWebView class method pointers to
     *     override so we have to use signal handlers. */

    g_signal_connect (
        web_view, "create-plugin-widget",
        G_CALLBACK (web_view_create_plugin_widget_cb), NULL);

    g_signal_connect (
        web_view, "context-menu",
        G_CALLBACK (web_view_context_menu_cb), NULL);

    g_signal_connect (
        web_view, "hovering-over-link",
        G_CALLBACK (web_view_hovering_over_link_cb), NULL);

    g_signal_connect (
        web_view, "navigation-policy-decision-requested",
        G_CALLBACK (web_view_navigation_policy_decision_requested_cb),
        NULL);

    g_signal_connect (
        web_view, "new-window-policy-decision-requested",
        G_CALLBACK (web_view_navigation_policy_decision_requested_cb),
        NULL);

    g_signal_connect (
        web_view, "document-load-finished",
        G_CALLBACK (style_updated_cb), NULL);

    g_signal_connect (
        web_view, "notify::load-status",
        G_CALLBACK (web_view_load_status_changed_cb), NULL);

    g_signal_connect (
        web_view, "style-updated",
        G_CALLBACK (style_updated_cb), NULL);

    g_signal_connect (
        web_view, "state-flags-changed",
        G_CALLBACK (style_updated_cb), NULL);

    ui_manager = gtk_ui_manager_new ();
    web_view->priv->ui_manager = ui_manager;

    g_signal_connect_swapped (
        ui_manager, "connect-proxy",
        G_CALLBACK (web_view_connect_proxy_cb), web_view);

    web_view_init_web_settings (WEBKIT_WEB_VIEW (web_view));

    e_web_view_install_request_handler (web_view, E_TYPE_FILE_REQUEST);
    e_web_view_install_request_handler (web_view, E_TYPE_STOCK_REQUEST);

    settings = g_settings_new ("org.gnome.desktop.interface");
    web_view->priv->font_settings = g_object_ref (settings);
    handler_id = g_signal_connect_swapped (
        settings, "changed::font-name",
        G_CALLBACK (e_web_view_update_fonts), web_view);
    web_view->priv->font_name_changed_handler_id = handler_id;
    handler_id = g_signal_connect_swapped (
        settings, "changed::monospace-font-name",
        G_CALLBACK (e_web_view_update_fonts), web_view);
    web_view->priv->monospace_font_name_changed_handler_id = handler_id;
    g_object_unref (settings);

    /* This schema is optional.  Use if available. */
    id = "org.gnome.settings-daemon.plugins.xsettings";
    settings_schema = g_settings_schema_source_lookup (
        g_settings_schema_source_get_default (), id, FALSE);
    if (settings_schema != NULL) {
        settings = g_settings_new (id);
        web_view->priv->aliasing_settings = g_object_ref (settings);
        handler_id = g_signal_connect_swapped (
            settings, "changed::antialiasing",
            G_CALLBACK (e_web_view_update_fonts), web_view);
        web_view->priv->antialiasing_changed_handler_id = handler_id;
        g_object_unref (settings);
    }

    e_web_view_update_fonts (web_view);

    action_group = gtk_action_group_new ("uri");
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    gtk_action_group_add_actions (
        action_group, uri_entries,
        G_N_ELEMENTS (uri_entries), web_view);

    action_group = gtk_action_group_new ("http");
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    gtk_action_group_add_actions (
        action_group, http_entries,
        G_N_ELEMENTS (http_entries), web_view);

    action_group = gtk_action_group_new ("mailto");
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    gtk_action_group_add_actions (
        action_group, mailto_entries,
        G_N_ELEMENTS (mailto_entries), web_view);

    action_group = gtk_action_group_new ("image");
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    gtk_action_group_add_actions (
        action_group, image_entries,
        G_N_ELEMENTS (image_entries), web_view);

    action_group = gtk_action_group_new ("selection");
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    gtk_action_group_add_actions (
        action_group, selection_entries,
        G_N_ELEMENTS (selection_entries), web_view);

    action_group = gtk_action_group_new ("standard");
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    gtk_action_group_add_actions (
        action_group, standard_entries,
        G_N_ELEMENTS (standard_entries), web_view);

    popup_action = e_popup_action_new ("open");
    gtk_action_group_add_action (action_group, GTK_ACTION (popup_action));
    g_object_unref (popup_action);

    g_object_bind_property (
        web_view, "open-proxy",
        popup_action, "related-action",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);

    /* Support lockdown. */

    action_group = gtk_action_group_new ("lockdown-printing");
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    popup_action = e_popup_action_new ("print");
    gtk_action_group_add_action (action_group, GTK_ACTION (popup_action));
    g_object_unref (popup_action);

    g_object_bind_property (
        web_view, "print-proxy",
        popup_action, "related-action",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);

    action_group = gtk_action_group_new ("lockdown-save-to-disk");
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);

    popup_action = e_popup_action_new ("save-as");
    gtk_action_group_add_action (action_group, GTK_ACTION (popup_action));
    g_object_unref (popup_action);

    g_object_bind_property (
        web_view, "save-as-proxy",
        popup_action, "related-action",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);

    /* Because we are loading from a hard-coded string, there is
     * no chance of I/O errors.  Failure here implies a malformed
     * UI definition.  Full stop. */
    gtk_ui_manager_add_ui_from_string (ui_manager, ui, -1, &error);
    if (error != NULL)
        g_error ("%s", error->message);

    id = "org.gnome.evolution.webview";
    e_plugin_ui_register_manager (ui_manager, id, web_view);
    e_plugin_ui_enable_manager (ui_manager, id);

    e_web_view_clear (E_WEB_VIEW (web_view));
}

GtkWidget *
e_web_view_new (void)
{
    return g_object_new (E_TYPE_WEB_VIEW, NULL);
}

void
e_web_view_clear (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_load_html_string (
        WEBKIT_WEB_VIEW (web_view),
        "<html>"
        "<head></head>"
        "<body class=\"-e-web-view-background-color -e-web-view-text-color\"></body>"
        "</html>",
        NULL);
}

void
e_web_view_load_string (EWebView *web_view,
                        const gchar *string)
{
    EWebViewClass *class;

    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    class = E_WEB_VIEW_GET_CLASS (web_view);
    g_return_if_fail (class->load_string != NULL);

    class->load_string (web_view, string);
}

void
e_web_view_load_uri (EWebView *web_view,
                     const gchar *uri)
{
    EWebViewClass *class;

    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    class = E_WEB_VIEW_GET_CLASS (web_view);
    g_return_if_fail (class->load_uri != NULL);

    class->load_uri (web_view, uri);
}

/**
 * e_web_view_redirect_uri:
 * @web_view: an #EWebView
 * @uri: the requested URI
 *
 * Replaces @uri with a redirected URI as necessary, primarily for use
 * with custom #SoupRequest handlers.  Typically this function would be
 * called just prior to handing a request off to a #SoupSession, such as
 * from a #WebKitWebView #WebKitWebView::resource-request-starting signal
 * handler.
 *
 * A newly-allocated URI string is always returned, whether the @uri was
 * redirected or not.  Free the returned string with g_free().
 *
 * Returns: the redirected URI or a copy of @uri
 **/
gchar *
e_web_view_redirect_uri (EWebView *web_view,
                         const gchar *uri)
{
    EWebViewClass *class;

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);
    g_return_val_if_fail (uri != NULL, NULL);

    class = E_WEB_VIEW_GET_CLASS (web_view);
    g_return_val_if_fail (class->redirect_uri != NULL, NULL);

    return class->redirect_uri (web_view, uri);
}

/**
 * e_web_view_suggest_filename:
 * @web_view: an #EWebView
 * @uri: a URI string
 *
 * Attempts to derive a suggested filename from the @uri for use in a
 * "Save As" dialog.
 *
 * By default the suggested filename is the last path segment of the @uri
 * (unless @uri looks like a query), but subclasses can use other mechanisms
 * for custom URI schemes.  For example, "cid:" URIs in an email message may
 * refer to a MIME part with a suggested filename in its Content-Disposition
 * header.
 *
 * The returned string should be freed with g_free() when finished with it,
 * but callers should also be prepared for the function to return %NULL if
 * a filename cannot be determined.
 *
 * Returns: a suggested filename, or %NULL
 **/
gchar *
e_web_view_suggest_filename (EWebView *web_view,
                             const gchar *uri)
{
    EWebViewClass *class;
    gchar *filename;

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);
    g_return_val_if_fail (uri != NULL, NULL);

    class = E_WEB_VIEW_GET_CLASS (web_view);
    g_return_val_if_fail (class->suggest_filename != NULL, NULL);

    filename = class->suggest_filename (web_view, uri);

    if (filename != NULL)
        e_filename_make_safe (filename);

    return filename;
}

void
e_web_view_reload (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_reload (WEBKIT_WEB_VIEW (web_view));
}

gchar *
e_web_view_get_html (EWebView *web_view)
{
    WebKitDOMDocument *document;
    WebKitDOMElement *element;

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    document = webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (web_view));
    element = webkit_dom_document_get_document_element (document);

    return webkit_dom_html_element_get_outer_html (
        WEBKIT_DOM_HTML_ELEMENT (element));
}

gboolean
e_web_view_get_caret_mode (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    return web_view->priv->caret_mode;
}

void
e_web_view_set_caret_mode (EWebView *web_view,
                           gboolean caret_mode)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (web_view->priv->caret_mode == caret_mode)
        return;

    web_view->priv->caret_mode = caret_mode;

    g_object_notify (G_OBJECT (web_view), "caret-mode");
}

GtkTargetList *
e_web_view_get_copy_target_list (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    return webkit_web_view_get_copy_target_list (
        WEBKIT_WEB_VIEW (web_view));
}

gboolean
e_web_view_get_disable_printing (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    return web_view->priv->disable_printing;
}

void
e_web_view_set_disable_printing (EWebView *web_view,
                                 gboolean disable_printing)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (web_view->priv->disable_printing == disable_printing)
        return;

    web_view->priv->disable_printing = disable_printing;

    g_object_notify (G_OBJECT (web_view), "disable-printing");
}

gboolean
e_web_view_get_disable_save_to_disk (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    return web_view->priv->disable_save_to_disk;
}

void
e_web_view_set_disable_save_to_disk (EWebView *web_view,
                                     gboolean disable_save_to_disk)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (web_view->priv->disable_save_to_disk == disable_save_to_disk)
        return;

    web_view->priv->disable_save_to_disk = disable_save_to_disk;

    g_object_notify (G_OBJECT (web_view), "disable-save-to-disk");
}

gboolean
e_web_view_get_editable (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    return webkit_web_view_get_editable (WEBKIT_WEB_VIEW (web_view));
}

void
e_web_view_set_editable (EWebView *web_view,
                         gboolean editable)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_set_editable (WEBKIT_WEB_VIEW (web_view), editable);
}

gboolean
e_web_view_get_inline_spelling (EWebView *web_view)
{
#if 0  /* WEBKIT - XXX No equivalent property? */
    /* XXX This is just here to maintain symmetry
     *     with e_web_view_set_inline_spelling(). */

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    return gtk_html_get_inline_spelling (GTK_HTML (web_view));
#endif

    return FALSE;
}

void
e_web_view_set_inline_spelling (EWebView *web_view,
                                gboolean inline_spelling)
{
#if 0  /* WEBKIT - XXX No equivalent property? */
    /* XXX GtkHTML does not utilize GObject properties as well
     *     as it could.  This just wraps gtk_html_set_inline_spelling()
     *     so we get a "notify::inline-spelling" signal. */

    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    gtk_html_set_inline_spelling (GTK_HTML (web_view), inline_spelling);

    g_object_notify (G_OBJECT (web_view), "inline-spelling");
#endif
}

gboolean
e_web_view_get_magic_links (EWebView *web_view)
{
#if 0  /* WEBKIT - XXX No equivalent property? */
    /* XXX This is just here to maintain symmetry
     *     with e_web_view_set_magic_links(). */

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    return gtk_html_get_magic_links (GTK_HTML (web_view));
#endif

    return FALSE;
}

void
e_web_view_set_magic_links (EWebView *web_view,
                            gboolean magic_links)
{
#if 0  /* WEBKIT - XXX No equivalent property? */
    /* XXX GtkHTML does not utilize GObject properties as well
     *     as it could.  This just wraps gtk_html_set_magic_links()
     *     so we can get a "notify::magic-links" signal. */

    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    gtk_html_set_magic_links (GTK_HTML (web_view), magic_links);

    g_object_notify (G_OBJECT (web_view), "magic-links");
#endif
}

gboolean
e_web_view_get_magic_smileys (EWebView *web_view)
{
#if 0  /* WEBKIT - No equivalent property? */
    /* XXX This is just here to maintain symmetry
     *     with e_web_view_set_magic_smileys(). */

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    return gtk_html_get_magic_smileys (GTK_HTML (web_view));
#endif

    return FALSE;
}

void
e_web_view_set_magic_smileys (EWebView *web_view,
                              gboolean magic_smileys)
{
#if 0  /* WEBKIT - No equivalent property? */
    /* XXX GtkHTML does not utilize GObject properties as well
     *     as it could.  This just wraps gtk_html_set_magic_smileys()
     *     so we can get a "notify::magic-smileys" signal. */

    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    gtk_html_set_magic_smileys (GTK_HTML (web_view), magic_smileys);

    g_object_notify (G_OBJECT (web_view), "magic-smileys");
#endif
}

const gchar *
e_web_view_get_selected_uri (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    return web_view->priv->selected_uri;
}

void
e_web_view_set_selected_uri (EWebView *web_view,
                             const gchar *selected_uri)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (g_strcmp0 (web_view->priv->selected_uri, selected_uri) == 0)
        return;

    g_free (web_view->priv->selected_uri);
    web_view->priv->selected_uri = g_strdup (selected_uri);

    g_object_notify (G_OBJECT (web_view), "selected-uri");
}

const gchar *
e_web_view_get_cursor_image_src (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    return web_view->priv->cursor_image_src;
}

void
e_web_view_set_cursor_image_src (EWebView *web_view,
                                 const gchar *src_uri)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (g_strcmp0 (web_view->priv->cursor_image_src, src_uri) == 0)
        return;

    g_free (web_view->priv->cursor_image_src);
    web_view->priv->cursor_image_src = g_strdup (src_uri);

    g_object_notify (G_OBJECT (web_view), "cursor-image-src");
}

GtkAction *
e_web_view_get_open_proxy (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    return web_view->priv->open_proxy;
}

void
e_web_view_set_open_proxy (EWebView *web_view,
                           GtkAction *open_proxy)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (web_view->priv->open_proxy == open_proxy)
        return;

    if (open_proxy != NULL) {
        g_return_if_fail (GTK_IS_ACTION (open_proxy));
        g_object_ref (open_proxy);
    }

    if (web_view->priv->open_proxy != NULL)
        g_object_unref (web_view->priv->open_proxy);

    web_view->priv->open_proxy = open_proxy;

    g_object_notify (G_OBJECT (web_view), "open-proxy");
}

GtkTargetList *
e_web_view_get_paste_target_list (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    return webkit_web_view_get_paste_target_list (
        WEBKIT_WEB_VIEW (web_view));
}

GtkAction *
e_web_view_get_print_proxy (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    return web_view->priv->print_proxy;
}

void
e_web_view_set_print_proxy (EWebView *web_view,
                            GtkAction *print_proxy)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (web_view->priv->print_proxy == print_proxy)
        return;

    if (print_proxy != NULL) {
        g_return_if_fail (GTK_IS_ACTION (print_proxy));
        g_object_ref (print_proxy);
    }

    if (web_view->priv->print_proxy != NULL)
        g_object_unref (web_view->priv->print_proxy);

    web_view->priv->print_proxy = print_proxy;

    g_object_notify (G_OBJECT (web_view), "print-proxy");
}

GtkAction *
e_web_view_get_save_as_proxy (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    return web_view->priv->save_as_proxy;
}

void
e_web_view_set_save_as_proxy (EWebView *web_view,
                              GtkAction *save_as_proxy)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (web_view->priv->save_as_proxy == save_as_proxy)
        return;

    if (save_as_proxy != NULL) {
        g_return_if_fail (GTK_IS_ACTION (save_as_proxy));
        g_object_ref (save_as_proxy);
    }

    if (web_view->priv->save_as_proxy != NULL)
        g_object_unref (web_view->priv->save_as_proxy);

    web_view->priv->save_as_proxy = save_as_proxy;

    g_object_notify (G_OBJECT (web_view), "save-as-proxy");
}

void
e_web_view_add_highlight (EWebView *web_view,
                          const gchar *highlight)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));
    g_return_if_fail (highlight && *highlight);

    g_queue_push_tail (
        &web_view->priv->highlights,
        g_strdup (highlight));

    webkit_web_view_mark_text_matches (
        WEBKIT_WEB_VIEW (web_view), highlight, FALSE, 0);

    webkit_web_view_set_highlight_text_matches (
        WEBKIT_WEB_VIEW (web_view), TRUE);
}

void
e_web_view_clear_highlights (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_unmark_text_matches (WEBKIT_WEB_VIEW (web_view));

    while (!g_queue_is_empty (&web_view->priv->highlights))
        g_free (g_queue_pop_head (&web_view->priv->highlights));
}

void
e_web_view_update_highlights (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    web_view_update_document_highlights (web_view);
}

GtkAction *
e_web_view_get_action (EWebView *web_view,
                       const gchar *action_name)
{
    GtkUIManager *ui_manager;

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);
    g_return_val_if_fail (action_name != NULL, NULL);

    ui_manager = e_web_view_get_ui_manager (web_view);

    return e_lookup_action (ui_manager, action_name);
}

GtkActionGroup *
e_web_view_get_action_group (EWebView *web_view,
                             const gchar *group_name)
{
    GtkUIManager *ui_manager;

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);
    g_return_val_if_fail (group_name != NULL, NULL);

    ui_manager = e_web_view_get_ui_manager (web_view);

    return e_lookup_action_group (ui_manager, group_name);
}

void
e_web_view_copy_clipboard (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_copy_clipboard (WEBKIT_WEB_VIEW (web_view));
}

void
e_web_view_cut_clipboard (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_cut_clipboard (WEBKIT_WEB_VIEW (web_view));
}

gboolean
e_web_view_is_selection_active (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    return webkit_web_view_has_selection (WEBKIT_WEB_VIEW (web_view));
}

void
e_web_view_paste_clipboard (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_paste_clipboard (WEBKIT_WEB_VIEW (web_view));
}

gboolean
e_web_view_scroll_forward (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    webkit_web_view_move_cursor (
        WEBKIT_WEB_VIEW (web_view), GTK_MOVEMENT_PAGES, 1);

    return TRUE;  /* XXX This means nothing. */
}

gboolean
e_web_view_scroll_backward (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);

    webkit_web_view_move_cursor (
        WEBKIT_WEB_VIEW (web_view), GTK_MOVEMENT_PAGES, -1);

    return TRUE;  /* XXX This means nothing. */
}

void
e_web_view_select_all (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_select_all (WEBKIT_WEB_VIEW (web_view));
}

void
e_web_view_unselect_all (EWebView *web_view)
{
#if 0  /* WEBKIT */
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    gtk_html_command (GTK_HTML (web_view), "unselect-all");
#endif
}

void
e_web_view_zoom_100 (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    webkit_web_view_set_zoom_level (WEBKIT_WEB_VIEW (web_view), 1.0);
}

void
e_web_view_zoom_in (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (webkit_web_view_get_zoom_level (WEBKIT_WEB_VIEW (web_view)) < 4.9999)
        webkit_web_view_zoom_in (WEBKIT_WEB_VIEW (web_view));
}

void
e_web_view_zoom_out (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (webkit_web_view_get_zoom_level (WEBKIT_WEB_VIEW (web_view)) > 0.1999)
        webkit_web_view_zoom_out (WEBKIT_WEB_VIEW (web_view));
}

GtkUIManager *
e_web_view_get_ui_manager (EWebView *web_view)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    return web_view->priv->ui_manager;
}

GtkWidget *
e_web_view_get_popup_menu (EWebView *web_view)
{
    GtkUIManager *ui_manager;
    GtkWidget *menu;

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    ui_manager = e_web_view_get_ui_manager (web_view);
    menu = gtk_ui_manager_get_widget (ui_manager, "/context");
    g_return_val_if_fail (GTK_IS_MENU (menu), NULL);

    return menu;
}

void
e_web_view_show_popup_menu (EWebView *web_view)
{
    GtkWidget *menu;

    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    e_web_view_update_actions (web_view);

    menu = e_web_view_get_popup_menu (web_view);

    gtk_menu_popup (
        GTK_MENU (menu), NULL, NULL, NULL, NULL,
        0, gtk_get_current_event_time ());
}

/**
 * e_web_view_new_activity:
 * @web_view: an #EWebView
 *
 * Returns a new #EActivity for an #EWebView-related asynchronous operation,
 * and emits the #EWebView::new-activity signal.  By default the #EActivity
 * comes loaded with a #GCancellable and sets the @web_view itself as the
 * #EActivity:alert-sink (which means alerts are displayed directly in the
 * content area).  The signal emission allows the #EActivity to be further
 * customized and/or tracked by the application.
 *
 * Returns: an #EActivity
 **/
EActivity *
e_web_view_new_activity (EWebView *web_view)
{
    EActivity *activity;
    EAlertSink *alert_sink;
    GCancellable *cancellable;

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    activity = e_activity_new ();

    alert_sink = E_ALERT_SINK (web_view);
    e_activity_set_alert_sink (activity, alert_sink);

    cancellable = g_cancellable_new ();
    e_activity_set_cancellable (activity, cancellable);
    g_object_unref (cancellable);

    g_signal_emit (web_view, signals[NEW_ACTIVITY], 0, activity);

    return activity;
}

void
e_web_view_status_message (EWebView *web_view,
                           const gchar *status_message)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    g_signal_emit (web_view, signals[STATUS_MESSAGE], 0, status_message);
}

void
e_web_view_stop_loading (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    g_signal_emit (web_view, signals[STOP_LOADING], 0);
}

void
e_web_view_update_actions (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    g_signal_emit (web_view, signals[UPDATE_ACTIONS], 0);
}

static gchar *
web_view_get_frame_selection_html (WebKitDOMElement *iframe)
{
    WebKitDOMDocument *document;
    WebKitDOMDOMWindow *window;
    WebKitDOMDOMSelection *selection;
    WebKitDOMNodeList *frames;
    gulong ii, length;

    document = webkit_dom_html_iframe_element_get_content_document (
        WEBKIT_DOM_HTML_IFRAME_ELEMENT (iframe));
    window = webkit_dom_document_get_default_view (document);
    selection = webkit_dom_dom_window_get_selection (window);
    if (selection && (webkit_dom_dom_selection_get_range_count (selection) > 0)) {
        WebKitDOMRange *range;
        WebKitDOMElement *element;
        WebKitDOMDocumentFragment *fragment;

        range = webkit_dom_dom_selection_get_range_at (selection, 0, NULL);
        if (range != NULL) {
            fragment = webkit_dom_range_clone_contents (
                range, NULL);

            element = webkit_dom_document_create_element (
                document, "DIV", NULL);
            webkit_dom_node_append_child (
                WEBKIT_DOM_NODE (element),
                WEBKIT_DOM_NODE (fragment), NULL);

            return webkit_dom_html_element_get_inner_html (
                WEBKIT_DOM_HTML_ELEMENT (element));
        }
    }

    frames = webkit_dom_document_get_elements_by_tag_name (
        document, "IFRAME");
    length = webkit_dom_node_list_get_length (frames);
    for (ii = 0; ii < length; ii++) {
        WebKitDOMNode *node;
        gchar *text;

        node = webkit_dom_node_list_item (frames, ii);

        text = web_view_get_frame_selection_html (
            WEBKIT_DOM_ELEMENT (node));

        if (text != NULL)
            return text;
    }

    return NULL;
}

gchar *
e_web_view_get_selection_html (EWebView *web_view)
{
    WebKitDOMDocument *document;
    WebKitDOMNodeList *frames;
    gulong ii, length;

    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), NULL);

    if (!webkit_web_view_has_selection (WEBKIT_WEB_VIEW (web_view)))
        return NULL;

    document = webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (web_view));
    frames = webkit_dom_document_get_elements_by_tag_name (document, "IFRAME");
    length = webkit_dom_node_list_get_length (frames);

    for (ii = 0; ii < length; ii++) {
        gchar *text;
        WebKitDOMNode *node;

        node = webkit_dom_node_list_item (frames, ii);

        text = web_view_get_frame_selection_html (
            WEBKIT_DOM_ELEMENT (node));

        if (text != NULL)
            return text;
    }

    return NULL;
}

void
e_web_view_update_fonts (EWebView *web_view)
{
    EWebViewClass *class;
    GString *stylesheet;
    gchar *base64;
    gchar *aa = NULL;
    WebKitWebSettings *settings;
    PangoFontDescription *min_size, *ms, *vw;
    const gchar *styles[] = { "normal", "oblique", "italic" };
    const gchar *smoothing = NULL;
    GtkStyleContext *context;
    GdkColor *link = NULL;
    GdkColor *visited = NULL;

    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    ms = NULL;
    vw = NULL;

    class = E_WEB_VIEW_GET_CLASS (web_view);
    if (class->set_fonts != NULL)
        class->set_fonts (web_view, &ms, &vw);

    if (ms == NULL) {
        gchar *font;

        font = g_settings_get_string (
            web_view->priv->font_settings,
            "monospace-font-name");

        ms = pango_font_description_from_string (
            (font != NULL) ? font : "monospace 10");

        g_free (font);
    }

    if (vw == NULL) {
        gchar *font;

        font = g_settings_get_string (
            web_view->priv->font_settings,
            "font-name");

        vw = pango_font_description_from_string (
            (font != NULL) ? font : "serif 10");

        g_free (font);
    }

    if (pango_font_description_get_size (ms) < pango_font_description_get_size (vw)) {
        min_size = ms;
    } else {
        min_size = vw;
    }

    stylesheet = g_string_new ("");
    g_string_append_printf (
        stylesheet,
        "body {\n"
        "  font-family: '%s';\n"
        "  font-size: %dpt;\n"
        "  font-weight: %d;\n"
        "  font-style: %s;\n",
        pango_font_description_get_family (vw),
        pango_font_description_get_size (vw) / PANGO_SCALE,
        pango_font_description_get_weight (vw),
        styles[pango_font_description_get_style (vw)]);

    if (web_view->priv->aliasing_settings != NULL)
        aa = g_settings_get_string (
            web_view->priv->aliasing_settings, "antialiasing");

    if (g_strcmp0 (aa, "none") == 0)
        smoothing = "none";
    else if (g_strcmp0 (aa, "grayscale") == 0)
        smoothing = "antialiased";
    else if (g_strcmp0 (aa, "rgba") == 0)
        smoothing = "subpixel-antialiased";

    if (smoothing != NULL)
        g_string_append_printf (
            stylesheet,
            " -webkit-font-smoothing: %s;\n",
            smoothing);

    g_free (aa);

    g_string_append (stylesheet, "}\n");

    g_string_append_printf (
        stylesheet,
        "pre,code,.pre {\n"
        "  font-family: '%s';\n"
        "  font-size: %dpt;\n"
        "  font-weight: %d;\n"
        "  font-style: %s;\n"
        "}",
        pango_font_description_get_family (ms),
        pango_font_description_get_size (ms) / PANGO_SCALE,
        pango_font_description_get_weight (ms),
        styles[pango_font_description_get_style (ms)]);

    context = gtk_widget_get_style_context (GTK_WIDGET (web_view));
    gtk_style_context_get_style (
        context,
        "link-color", &link,
        "visited-link-color", &visited,
        NULL);

    if (link == NULL) {
        link = g_slice_new0 (GdkColor);
        link->blue = G_MAXINT16;
    }

    if (visited == NULL) {
        visited = g_slice_new0 (GdkColor);
        visited->red = G_MAXINT16;
    }

    g_string_append_printf (
        stylesheet,
        "a {\n"
        "  color: #%06x;\n"
        "}\n"
        "a:visited {\n"
        "  color: #%06x;\n"
        "}\n",
        e_color_to_value (link),
        e_color_to_value (visited));

    gdk_color_free (link);
    gdk_color_free (visited);

    base64 = g_base64_encode ((guchar *) stylesheet->str, stylesheet->len);
    g_string_free (stylesheet, TRUE);

    stylesheet = g_string_new ("data:text/css;charset=utf-8;base64,");
    g_string_append (stylesheet, base64);
    g_free (base64);

    settings = webkit_web_view_get_settings (WEBKIT_WEB_VIEW (web_view));
    g_object_set (
        G_OBJECT (settings),
        "default-font-size",
        pango_font_description_get_size (vw) / PANGO_SCALE,
        "default-font-family",
        pango_font_description_get_family (vw),
        "monospace-font-family",
        pango_font_description_get_family (ms),
        "default-monospace-font-size",
        pango_font_description_get_size (ms) / PANGO_SCALE,
        "minimum-font-size",
        pango_font_description_get_size (min_size) / PANGO_SCALE,
        "user-stylesheet-uri",
        stylesheet->str,
        NULL);

    g_string_free (stylesheet, TRUE);

    pango_font_description_free (ms);
    pango_font_description_free (vw);
}

/* Helper for e_web_view_cursor_image_copy() */
static void
web_view_cursor_image_copy_pixbuf_cb (GObject *source_object,
                                      GAsyncResult *result,
                                      gpointer user_data)
{
    EActivity *activity;
    EAlertSink *alert_sink;
    GdkPixbuf *pixbuf;
    GError *local_error = NULL;

    activity = E_ACTIVITY (user_data);
    alert_sink = e_activity_get_alert_sink (activity);

    pixbuf = gdk_pixbuf_new_from_stream_finish (result, &local_error);

    /* Sanity check. */
    g_return_if_fail (
        ((pixbuf != NULL) && (local_error == NULL)) ||
        ((pixbuf == NULL) && (local_error != NULL)));

    if (e_activity_handle_cancellation (activity, local_error)) {
        g_error_free (local_error);

    } else if (local_error != NULL) {
        e_alert_submit (
            alert_sink,
            "widgets:no-image-copy",
            local_error->message, NULL);
        g_error_free (local_error);

    } else {
        GtkClipboard *clipboard;

        clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
        gtk_clipboard_set_image (clipboard, pixbuf);
        gtk_clipboard_store (clipboard);

        e_activity_set_state (activity, E_ACTIVITY_COMPLETED);
    }

    g_clear_object (&activity);
    g_clear_object (&pixbuf);
}

/* Helper for e_web_view_cursor_image_copy() */
static void
web_view_cursor_image_copy_request_cb (GObject *source_object,
                                       GAsyncResult *result,
                                       gpointer user_data)
{
    EActivity *activity;
    EAlertSink *alert_sink;
    GCancellable *cancellable;
    GInputStream *input_stream;
    GError *local_error = NULL;

    activity = E_ACTIVITY (user_data);
    alert_sink = e_activity_get_alert_sink (activity);
    cancellable = e_activity_get_cancellable (activity);

    input_stream = e_web_view_request_finish (
        E_WEB_VIEW (source_object), result, &local_error);

    /* Sanity check. */
    g_return_if_fail (
        ((input_stream != NULL) && (local_error == NULL)) ||
        ((input_stream == NULL) && (local_error != NULL)));

    if (e_activity_handle_cancellation (activity, local_error)) {
        g_error_free (local_error);

    } else if (local_error != NULL) {
        e_alert_submit (
            alert_sink,
            "widgets:no-image-copy",
            local_error->message, NULL);
        g_error_free (local_error);

    } else {
        gdk_pixbuf_new_from_stream_async (
            input_stream, cancellable,
            web_view_cursor_image_copy_pixbuf_cb,
            g_object_ref (activity));
    }

    g_clear_object (&activity);
    g_clear_object (&input_stream);
}

/**
 * e_web_view_cursor_image_copy:
 * @web_view: an #EWebView
 *
 * Asynchronously copies the image under the cursor to the clipboard.
 *
 * This function triggers a #EWebView::new-activity signal emission so
 * the asynchronous operation can be tracked and/or cancelled.
 **/
void
e_web_view_cursor_image_copy (EWebView *web_view)
{
    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (web_view->priv->cursor_image_src != NULL) {
        EActivity *activity;
        GCancellable *cancellable;
        const gchar *text;

        activity = e_web_view_new_activity (web_view);
        cancellable = e_activity_get_cancellable (activity);

        text = _("Copying image to clipboard");
        e_activity_set_text (activity, text);

        e_web_view_request (
            web_view,
            web_view->priv->cursor_image_src,
            cancellable,
            web_view_cursor_image_copy_request_cb,
            g_object_ref (activity));

        g_object_unref (activity);
    }
}

/* Helper for e_web_view_cursor_image_save() */
static void
web_view_cursor_image_save_splice_cb (GObject *source_object,
                                      GAsyncResult *result,
                                      gpointer user_data)
{
    EActivity *activity;
    EAlertSink *alert_sink;
    AsyncContext *async_context;
    GError *local_error = NULL;

    async_context = (AsyncContext *) user_data;

    activity = async_context->activity;
    alert_sink = e_activity_get_alert_sink (activity);

    g_output_stream_splice_finish (
        G_OUTPUT_STREAM (source_object), result, &local_error);

    if (e_activity_handle_cancellation (activity, local_error)) {
        g_error_free (local_error);

    } else if (local_error != NULL) {
        e_alert_submit (
            alert_sink,
            "widgets:no-image-save",
            local_error->message, NULL);
        g_error_free (local_error);

    } else {
        e_activity_set_state (activity, E_ACTIVITY_COMPLETED);
    }

    async_context_free (async_context);
}

/* Helper for e_web_view_cursor_image_save() */
static void
web_view_cursor_image_save_replace_cb (GObject *source_object,
                                       GAsyncResult *result,
                                       gpointer user_data)
{
    EActivity *activity;
    EAlertSink *alert_sink;
    GCancellable *cancellable;
    GFileOutputStream *output_stream;
    AsyncContext *async_context;
    GError *local_error = NULL;

    async_context = (AsyncContext *) user_data;

    activity = async_context->activity;
    alert_sink = e_activity_get_alert_sink (activity);
    cancellable = e_activity_get_cancellable (activity);

    output_stream = g_file_replace_finish (
        G_FILE (source_object), result, &local_error);

    /* Sanity check. */
    g_return_if_fail (
        ((output_stream != NULL) && (local_error == NULL)) ||
        ((output_stream == NULL) && (local_error != NULL)));

    if (e_activity_handle_cancellation (activity, local_error)) {
        g_error_free (local_error);
        async_context_free (async_context);

    } else if (local_error != NULL) {
        e_alert_submit (
            alert_sink,
            "widgets:no-image-save",
            local_error->message, NULL);
        g_error_free (local_error);
        async_context_free (async_context);

    } else {
        g_output_stream_splice_async (
            G_OUTPUT_STREAM (output_stream),
            async_context->input_stream,
            G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE |
            G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
            G_PRIORITY_DEFAULT,
            cancellable,
            web_view_cursor_image_save_splice_cb,
            async_context);
    }

    g_clear_object (&output_stream);
}

/* Helper for e_web_view_cursor_image_save() */
static void
web_view_cursor_image_save_request_cb (GObject *source_object,
                                       GAsyncResult *result,
                                       gpointer user_data)
{
    EActivity *activity;
    EAlertSink *alert_sink;
    GCancellable *cancellable;
    GInputStream *input_stream;
    AsyncContext *async_context;
    GError *local_error = NULL;

    async_context = (AsyncContext *) user_data;

    activity = async_context->activity;
    alert_sink = e_activity_get_alert_sink (activity);
    cancellable = e_activity_get_cancellable (activity);

    input_stream = e_web_view_request_finish (
        E_WEB_VIEW (source_object), result, &local_error);

    /* Sanity check. */
    g_return_if_fail (
        ((input_stream != NULL) && (local_error == NULL)) ||
        ((input_stream == NULL) && (local_error != NULL)));

    if (e_activity_handle_cancellation (activity, local_error)) {
        g_error_free (local_error);
        async_context_free (async_context);

    } else if (local_error != NULL) {
        e_alert_submit (
            alert_sink,
            "widgets:no-image-save",
            local_error->message, NULL);
        g_error_free (local_error);
        async_context_free (async_context);

    } else {
        async_context->input_stream = g_object_ref (input_stream);

        /* Open an output stream to the destination file. */
        g_file_replace_async (
            async_context->destination,
            NULL, FALSE,
            G_FILE_CREATE_REPLACE_DESTINATION,
            G_PRIORITY_DEFAULT,
            cancellable,
            web_view_cursor_image_save_replace_cb,
            async_context);
    }

    g_clear_object (&input_stream);
}

/**
 * e_web_view_cursor_image_save:
 * @web_view: an #EWebView
 *
 * Prompts the user to choose a destination file and then asynchronously
 * saves the image under the cursor to the destination file.
 *
 * This function triggers a #EWebView::new-activity signal emission so
 * the asynchronous operation can be tracked and/or cancelled.
 **/
void
e_web_view_cursor_image_save (EWebView *web_view)
{
    GtkFileChooser *file_chooser;
    GFile *destination = NULL;
    GtkWidget *dialog;
    gchar *suggestion;
    gpointer toplevel;

    g_return_if_fail (E_IS_WEB_VIEW (web_view));

    if (web_view->priv->cursor_image_src == NULL)
        return;

    toplevel = gtk_widget_get_toplevel (GTK_WIDGET (web_view));
    toplevel = gtk_widget_is_toplevel (toplevel) ? toplevel : NULL;

    dialog = gtk_file_chooser_dialog_new (
        _("Save Image"), toplevel,
        GTK_FILE_CHOOSER_ACTION_SAVE,
        _("_Cancel"), GTK_RESPONSE_CANCEL,
        _("_Save"), GTK_RESPONSE_ACCEPT, NULL);

    gtk_dialog_set_default_response (
        GTK_DIALOG (dialog), GTK_RESPONSE_ACCEPT);

    file_chooser = GTK_FILE_CHOOSER (dialog);
    gtk_file_chooser_set_local_only (file_chooser, FALSE);
    gtk_file_chooser_set_do_overwrite_confirmation (file_chooser, TRUE);

    suggestion = e_web_view_suggest_filename (
        web_view, web_view->priv->cursor_image_src);

    if (suggestion != NULL) {
        gtk_file_chooser_set_current_name (file_chooser, suggestion);
        g_free (suggestion);
    }

    if (gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_ACCEPT)
        destination = gtk_file_chooser_get_file (file_chooser);

    gtk_widget_destroy (dialog);

    if (destination != NULL) {
        EActivity *activity;
        GCancellable *cancellable;
        AsyncContext *async_context;
        gchar *text;
        gchar *uri;

        activity = e_web_view_new_activity (web_view);
        cancellable = e_activity_get_cancellable (activity);

        uri = g_file_get_uri (destination);
        text = g_strdup_printf (_("Saving image to '%s'"), uri);
        e_activity_set_text (activity, text);
        g_free (text);
        g_free (uri);

        async_context = g_slice_new0 (AsyncContext);
        async_context->activity = g_object_ref (activity);
        async_context->destination = g_object_ref (destination);

        e_web_view_request (
            web_view,
            web_view->priv->cursor_image_src,
            cancellable,
            web_view_cursor_image_save_request_cb,
            async_context);

        g_object_unref (activity);
        g_object_unref (destination);
    }
}

/* Helper for e_web_view_request() */
static void
web_view_request_send_cb (GObject *source_object,
                          GAsyncResult *result,
                          gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *async_context;
    GError *local_error = NULL;

    simple = G_SIMPLE_ASYNC_RESULT (user_data);
    async_context = g_simple_async_result_get_op_res_gpointer (simple);

    async_context->input_stream = soup_request_send_finish (
        SOUP_REQUEST (source_object), result, &local_error);

    if (local_error != NULL)
        g_simple_async_result_take_error (simple, local_error);

    g_simple_async_result_complete (simple);
}

/**
 * e_web_view_request:
 * @web_view: an #EWebView
 * @uri: the URI to load
 * @cancellable: optional #GCancellable object, or %NULL
 * @callback: a #GAsyncReadyCallback to call when the request is satisfied
 * @user_data: data to pass to the callback function
 *
 * Asynchronously requests data at @uri by way of a #SoupRequest to WebKit's
 * default #SoupSession, incorporating both e_web_view_redirect_uri() and the
 * custom request handlers installed via e_web_view_install_request_handler().
 *
 * When the operation is finished, @callback will be called.  You can then
 * call e_web_view_request_finish() to get the result of the operation.
 **/
void
e_web_view_request (EWebView *web_view,
                    const gchar *uri,
                    GCancellable *cancellable,
                    GAsyncReadyCallback callback,
                    gpointer user_data)
{
    SoupSession *session;
    SoupRequest *request;
    gchar *real_uri;
    GSimpleAsyncResult *simple;
    AsyncContext *async_context;
    GError *local_error = NULL;

    g_return_if_fail (E_IS_WEB_VIEW (web_view));
    g_return_if_fail (uri != NULL);

    session = webkit_get_default_session ();

    async_context = g_slice_new0 (AsyncContext);

    simple = g_simple_async_result_new (
        G_OBJECT (web_view), callback,
        user_data, e_web_view_request);

    g_simple_async_result_set_check_cancellable (simple, cancellable);

    g_simple_async_result_set_op_res_gpointer (
        simple, async_context, (GDestroyNotify) async_context_free);

    real_uri = e_web_view_redirect_uri (web_view, uri);
    request = soup_session_request (session, real_uri, &local_error);
    g_free (real_uri);

    /* Sanity check. */
    g_return_if_fail (
        ((request != NULL) && (local_error == NULL)) ||
        ((request == NULL) && (local_error != NULL)));

    if (request != NULL) {
        soup_request_send_async (
            request, cancellable,
            web_view_request_send_cb,
            g_object_ref (simple));

        g_object_unref (request);

    } else {
        g_simple_async_result_take_error (simple, local_error);
        g_simple_async_result_complete_in_idle (simple);
    }

    g_object_unref (simple);
}

/**
 * e_web_view_request_finish:
 * @web_view: an #EWebView
 * @result: a #GAsyncResult
 * @error: return location for a #GError, or %NULL
 *
 * Finishes the operation started with e_web_view_request().
 *
 * Unreference the returned #GInputStream with g_object_unref() when finished
 * with it.  If an error occurred, the function will set @error and return
 * %NULL.
 *
 * Returns: a #GInputStream, or %NULL
 **/
GInputStream *
e_web_view_request_finish (EWebView *web_view,
                           GAsyncResult *result,
                           GError **error)
{
    GSimpleAsyncResult *simple;
    AsyncContext *async_context;

    g_return_val_if_fail (
        g_simple_async_result_is_valid (
        result, G_OBJECT (web_view), e_web_view_request), NULL);

    simple = G_SIMPLE_ASYNC_RESULT (result);
    async_context = g_simple_async_result_get_op_res_gpointer (simple);

    if (g_simple_async_result_propagate_error (simple, error))
        return NULL;

    g_return_val_if_fail (async_context->input_stream != NULL, NULL);

    return g_object_ref (async_context->input_stream);
}

void
e_web_view_install_request_handler (EWebView *web_view,
                                    GType handler_type)
{
    SoupSession *session;

    session = webkit_get_default_session ();
    soup_session_add_feature_by_type (session, handler_type);
}

static void
create_and_add_css_style_sheet (WebKitDOMDocument *document,
                                const gchar *style_sheet_id)
{
    WebKitDOMElement *style_element;

    style_element = webkit_dom_document_get_element_by_id (document, style_sheet_id);

    if (!style_element) {
        /* Create new <style> element */
        style_element = webkit_dom_document_create_element (document, "style", NULL);
#if WEBKIT_CHECK_VERSION(2,2,0)  /* XXX should really be (2,1,something) */
        webkit_dom_element_set_id (
            WEBKIT_DOM_ELEMENT (style_element),
            style_sheet_id);
#else
        webkit_dom_html_element_set_id (
            WEBKIT_DOM_HTML_ELEMENT (style_element),
            style_sheet_id);
#endif
        webkit_dom_html_style_element_set_media (
            WEBKIT_DOM_HTML_STYLE_ELEMENT (style_element),
            "screen");
        webkit_dom_node_append_child (
            WEBKIT_DOM_NODE (style_element),
            /* WebKit hack - we have to insert empty TextNode into style element */
            WEBKIT_DOM_NODE (webkit_dom_document_create_text_node (document, "")),
            NULL);

        webkit_dom_node_append_child (
            WEBKIT_DOM_NODE (webkit_dom_document_get_head (document)),
            WEBKIT_DOM_NODE (style_element),
            NULL);
    }
}

static void
add_css_rule_into_style_sheet (WebKitDOMDocument *document,
                               const gchar *style_sheet_id,
                               const gchar *selector,
                               const gchar *style)
{
    WebKitDOMElement *style_element;
    WebKitDOMStyleSheet *sheet;
    WebKitDOMCSSRuleList *rules_list;
    gint length, ii;

    style_element = webkit_dom_document_get_element_by_id (document, style_sheet_id);

    if (!style_element) {
        create_and_add_css_style_sheet (document, style_sheet_id);
        style_element = webkit_dom_document_get_element_by_id (document, style_sheet_id);
    }

    /* Get sheet that is associated with style element */
    sheet = webkit_dom_html_style_element_get_sheet (WEBKIT_DOM_HTML_STYLE_ELEMENT (style_element));

    rules_list = webkit_dom_css_style_sheet_get_css_rules (WEBKIT_DOM_CSS_STYLE_SHEET (sheet));
    length = webkit_dom_css_rule_list_get_length (rules_list);

    /* Check if rule exists */
    for (ii = 0; ii < length; ii++) {
        WebKitDOMCSSRule *rule;
        gchar *rule_text;
        gchar *rule_selector, *selector_end;

        rule = webkit_dom_css_rule_list_item (rules_list, ii);

        if (!WEBKIT_DOM_IS_CSS_RULE (rule))
            continue;

        rule_text = webkit_dom_css_rule_get_css_text (rule);

        /* Find the start of the style => end of the selector */
        selector_end = g_strstr_len (rule_text, -1, " {");
        if (!selector_end) {
            g_free (rule_text);
            continue;
        }

        rule_selector =
            g_utf8_substring (
                rule_text,
                0,
                g_utf8_pointer_to_offset (rule_text, selector_end));

        if (g_strcmp0 (rule_selector, selector) == 0) {
            /* If exists remove it */
            webkit_dom_css_style_sheet_remove_rule (
                WEBKIT_DOM_CSS_STYLE_SHEET (sheet),
                ii, NULL);
        }

        g_free (rule_selector);
        g_free (rule_text);
    }

    /* Insert the rule at the end, so it will override previously inserted */
    webkit_dom_css_style_sheet_add_rule (
        WEBKIT_DOM_CSS_STYLE_SHEET (sheet),
        selector,
        style,
        webkit_dom_css_rule_list_get_length (
            webkit_dom_css_style_sheet_get_css_rules (
                WEBKIT_DOM_CSS_STYLE_SHEET (sheet))), /* Index */
        NULL);
}

static void
add_css_rule_into_style_sheet_recursive (WebKitDOMDocument *document,
                                         const gchar *style_sheet_id,
                                         const gchar *selector,
                                         const gchar *style)
{
    WebKitDOMNodeList *frames;
    gint ii, length;

    /* Add rule to document */
    add_css_rule_into_style_sheet (
        document,
        style_sheet_id,
        selector,
        style);

    frames = webkit_dom_document_query_selector_all (document, "iframe", NULL);
    length = webkit_dom_node_list_get_length (frames);

    /* Add rules to every sub document */
    for (ii = 0; ii < length; ii++) {
        WebKitDOMDocument *iframe_document;
        WebKitDOMNode *node;

        node = webkit_dom_node_list_item (frames, ii);
        iframe_document = webkit_dom_html_iframe_element_get_content_document (
            WEBKIT_DOM_HTML_IFRAME_ELEMENT (node));

        add_css_rule_into_style_sheet_recursive (
            iframe_document,
            style_sheet_id,
            selector,
            style);
    }
}

/**
 * e_web_view_add_css_rule_into_style_sheet:
 * @web_view: an #EWebView
 * @style_sheet_id: CSS style sheet's id
 * @selector: CSS selector
 * @style: style for given selector
 *
 * Insert new CSS rule (defined with @selector and @style) into CSS style sheet
 * with given @style_sheet_id. If style sheet doesn't exist, it's created.
 *
 * The rule is inserted to every DOM document that is in page. That means also
 * into DOM documents inside iframe elements.
 **/
void
e_web_view_add_css_rule_into_style_sheet (EWebView *view,
                                          const gchar *style_sheet_id,
                                          const gchar *selector,
                                          const gchar *style)
{
    g_return_if_fail (E_IS_WEB_VIEW (view));
    g_return_if_fail (style_sheet_id && *style_sheet_id);
    g_return_if_fail (selector && *selector);
    g_return_if_fail (style && *style);

    add_css_rule_into_style_sheet_recursive (
        webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (view)),
        style_sheet_id,
        selector,
        style);
}