path: root/mail/e-mail-display.c

/*
 * e-mail-display.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; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-mail-display.h"

#include <glib/gi18n.h>
#include <gdk/gdk.h>

#include <camel/camel.h>

#include "em-format/e-mail-part-utils.h"
#include "em-format/e-mail-formatter-extension.h"
#include "em-format/e-mail-extension-registry.h"
#include "em-format/e-mail-part-attachment.h"
#include "em-format/e-mail-formatter-print.h"

#include "e-http-request.h"
#include "e-mail-display-popup-extension.h"
#include "e-mail-request.h"
#include "em-composer-utils.h"
#include "em-utils.h"

#define d(x)

G_DEFINE_TYPE (
    EMailDisplay,
    e_mail_display,
    E_TYPE_WEB_VIEW);

#define E_MAIL_DISPLAY_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_DISPLAY, EMailDisplayPrivate))

struct _EMailDisplayPrivate {
    EMailPartList *part_list;
    EMailFormatterMode mode;
    EMailFormatter *formatter;

    gboolean headers_collapsable;
    gboolean headers_collapsed;

    gint force_image_load: 1;

    GSettings *settings;

    GHashTable *widgets;

    guint scheduled_reload;
};

enum {
    PROP_0,
    PROP_MODE,
    PROP_PART_LIST,
    PROP_HEADERS_COLLAPSABLE,
    PROP_HEADERS_COLLAPSED,
    PROP_FORMATTER
};

static CamelDataCache *emd_global_http_cache = NULL;

static const gchar *ui =
"<ui>"
"  <popup name='context'>"
"    <placeholder name='custom-actions-1'>"
"      <menuitem action='add-to-address-book'/>"
"      <menuitem action='send-reply'/>"
"    </placeholder>"
"    <placeholder name='custom-actions-3'>"
"      <menu action='search-folder-menu'>"
"        <menuitem action='search-folder-recipient'/>"
"        <menuitem action='search-folder-sender'/>"
"      </menu>"
"    </placeholder>"
"  </popup>"
"</ui>";

static const gchar *image_ui =
"<ui>"
"  <popup name='context'>"
"    <placeholder name='custom-actions-2'>"
"      <menuitem action='image-save'/>"
"    </placeholder>"
"  </popup>"
"</ui>";

static GtkActionEntry mailto_entries[] = {

    { "add-to-address-book",
      "contact-new",
      N_("_Add to Address Book..."),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      NULL   /* Handled by EMailReader */ },

    { "search-folder-recipient",
      NULL,
      N_("_To This Address"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      NULL   /* Handled by EMailReader */ },

    { "search-folder-sender",
      NULL,
      N_("_From This Address"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      NULL   /* Handled by EMailReader */ },

    { "send-reply",
      NULL,
      N_("Send _Reply To..."),
      NULL,
      N_("Send a reply message to this address"),
      NULL   /* Handled by EMailReader */ },

    /*** Menus ***/

    { "search-folder-menu",
      "folder-saved-search",
      N_("Create Search _Folder"),
      NULL,
      NULL,
      NULL }
};

static GtkActionEntry image_entries[] = {

    { "image-save",
      GTK_STOCK_SAVE,
      N_("Save _Image..."),
      NULL,
      N_("Save the image to a file"),
      NULL /* Handled by EMailReader */ },
};

static void
formatter_image_loading_policy_changed_cb (GObject *object,
                                           GParamSpec *pspec,
                                           gpointer user_data)
{
    EMailDisplay *display = user_data;
    EMailFormatter *formatter = E_MAIL_FORMATTER (object);
    EMailImageLoadingPolicy policy;

    policy = e_mail_formatter_get_image_loading_policy (formatter);

    if (policy == E_MAIL_IMAGE_LOADING_POLICY_ALWAYS)
        e_mail_display_load_images (display);
    else
        e_mail_display_reload (display);
}

static gboolean
mail_display_image_exists_in_cache (const gchar *image_uri)
{
    gchar *image_filename, *uri_md5;
    gboolean exists;

    g_return_val_if_fail (emd_global_http_cache != NULL, FALSE);

    uri_md5 = g_compute_checksum_for_string (G_CHECKSUM_MD5, image_uri, -1);
    image_filename = camel_data_cache_get_filename (emd_global_http_cache, "http", uri_md5);

    exists = image_filename && g_file_test (image_filename, G_FILE_TEST_EXISTS);

    g_free (uri_md5);
    g_free (image_filename);

    return exists;
}

static void
mail_display_update_formatter_colors (EMailDisplay *display)
{
    GtkStyle *style;
    GtkStateType state;

    if (display->priv->formatter == NULL)
        return;

    style = gtk_widget_get_style (GTK_WIDGET (display));
    state = gtk_widget_get_state (GTK_WIDGET (display));
    e_mail_formatter_set_style (display->priv->formatter, style, state);
}

static void
mail_display_plugin_widget_disconnect_children (GtkWidget *widget,
                                                gpointer mail_display)
{
    g_signal_handlers_disconnect_by_data (widget, mail_display);
}

static void
mail_display_plugin_widget_disconnect (gpointer widget_uri,
                                       gpointer widget,
                                       gpointer mail_display)
{
    if (E_IS_ATTACHMENT_BAR (widget))
        g_signal_handlers_disconnect_by_data (widget, mail_display);
    else if (E_IS_ATTACHMENT_BUTTON (widget))
        g_signal_handlers_disconnect_by_data (widget, mail_display);
    else if (GTK_IS_CONTAINER (widget))
        gtk_container_foreach (
            widget,
            mail_display_plugin_widget_disconnect_children,
            mail_display);
}

static gboolean
mail_display_process_mailto (EWebView *web_view,
                             const gchar *mailto_uri,
                             gpointer user_data)
{
    g_return_val_if_fail (E_IS_WEB_VIEW (web_view), FALSE);
    g_return_val_if_fail (mailto_uri != NULL, FALSE);

    if (g_ascii_strncasecmp (mailto_uri, "mailto:", 7) == 0) {
        EShell *shell;
        EMailPartList *part_list;
        CamelFolder *folder;

        part_list = E_MAIL_DISPLAY (web_view)->priv->part_list;
        folder = e_mail_part_list_get_folder (part_list);

        shell = e_shell_get_default ();
        em_utils_compose_new_message_with_mailto (
            shell, mailto_uri, folder);

        return TRUE;
    }

    return FALSE;
}

static gboolean
mail_display_link_clicked (WebKitWebView *web_view,
                           WebKitWebFrame *frame,
                           WebKitNetworkRequest *request,
                           WebKitWebNavigationAction *navigation_action,
                           WebKitWebPolicyDecision *policy_decision,
                           gpointer user_data)
{
    const gchar *uri = webkit_network_request_get_uri (request);

    if (g_str_has_prefix (uri, "file://")) {
        gchar *filename;

        filename = g_filename_from_uri (uri, NULL, NULL);

        if (g_file_test (filename, G_FILE_TEST_IS_DIR)) {
            webkit_web_policy_decision_ignore (policy_decision);
            webkit_network_request_set_uri (request, "about:blank");
            g_free (filename);
            return TRUE;
        }

        g_free (filename);
    }

    if (mail_display_process_mailto (E_WEB_VIEW (web_view), uri, NULL)) {
        /* do nothing, function handled the "mailto:" uri already */
        webkit_web_policy_decision_ignore (policy_decision);
        return TRUE;

    } else if (g_ascii_strncasecmp (uri, "thismessage:", 12) == 0) {
        /* ignore */
        webkit_web_policy_decision_ignore (policy_decision);
        return TRUE;

    } else if (g_ascii_strncasecmp (uri, "cid:", 4) == 0) {
        /* ignore */
        webkit_web_policy_decision_ignore (policy_decision);
        return TRUE;

    }

    /* Let WebKit handle it. */
    return FALSE;
}

static void
webkit_request_load_from_file (WebKitNetworkRequest *request,
                               const gchar *path)
{
    gchar *data = NULL;
    gsize length = 0;
    gchar *b64, *new_uri;
    gchar *ct;

    if (!g_file_get_contents (path, &data, &length, NULL))
        return;

    b64 = g_base64_encode ((guchar *) data, length);
    ct = g_content_type_guess (path, NULL, 0, NULL);

    new_uri =  g_strdup_printf ("data:%s;base64,%s", ct, b64);
    webkit_network_request_set_uri (request, new_uri);

    g_free (b64);
    g_free (new_uri);
    g_free (ct);
    g_free (data);
}

static void
mail_display_resource_requested (WebKitWebView *web_view,
                                 WebKitWebFrame *frame,
                                 WebKitWebResource *resource,
                                 WebKitNetworkRequest *request,
                                 WebKitNetworkResponse *response,
                                 gpointer user_data)
{
    EMailDisplay *display = E_MAIL_DISPLAY (web_view);
    EMailPartList *part_list;
    const gchar *uri = webkit_network_request_get_uri (request);

    part_list = display->priv->part_list;
    if (part_list == NULL)
        return;

    /* Redirect cid:part_id to mail://mail_id/cid:part_id */
    if (g_str_has_prefix (uri, "cid:")) {
        CamelFolder *folder;
        const gchar *message_uid;
        gchar *new_uri;

        folder = e_mail_part_list_get_folder (part_list);
        message_uid = e_mail_part_list_get_message_uid (part_list);

        /* Always write raw content of CID object. */
        new_uri = e_mail_part_build_uri (
            folder, message_uid,
            "part_id", G_TYPE_STRING, uri,
            "mode", G_TYPE_INT, E_MAIL_FORMATTER_MODE_CID, NULL);

        webkit_network_request_set_uri (request, new_uri);

        g_free (new_uri);

    /* WebKit won't allow to load a local file when displaying
     * "remote" mail:// protocol, so we need to handle this manually. */
    } else if (g_str_has_prefix (uri, "file:")) {
        gchar *path;

        path = g_filename_from_uri (uri, NULL, NULL);
        if (path == NULL)
            return;

        webkit_request_load_from_file (request, path);

        g_free (path);

    /* Redirect http(s) request to evo-http(s) protocol.
     * See EMailRequest for further details about this. */
    } else if (g_str_has_prefix (uri, "http:") || g_str_has_prefix (uri, "https:") ||
        g_str_has_prefix (uri, "evo-http:") || g_str_has_prefix (uri, "evo-https:")) {
        CamelFolder *folder;
        const gchar *message_uid;
        gchar *new_uri, *mail_uri, *enc;
        SoupURI *soup_uri;
        GHashTable *query;
        gboolean image_exists;
        EMailImageLoadingPolicy image_policy;

        /* Check Evolution's cache */
        image_exists = mail_display_image_exists_in_cache (uri);

        /* If the URI is not cached and we are not allowed to load it
         * then redirect to invalid URI, so that webkit would display
         * a native placeholder for it. */
        image_policy = e_mail_formatter_get_image_loading_policy (
            display->priv->formatter);
        if (!image_exists && !display->priv->force_image_load &&
            (image_policy == E_MAIL_IMAGE_LOADING_POLICY_NEVER)) {
            webkit_network_request_set_uri (request, "about:blank");
            return;
        }

        folder = e_mail_part_list_get_folder (part_list);
        message_uid = e_mail_part_list_get_message_uid (part_list);

        new_uri = g_strconcat ("evo-", uri, NULL);
        mail_uri = e_mail_part_build_uri (
            folder, message_uid, NULL, NULL);

        soup_uri = soup_uri_new (new_uri);
        if (soup_uri->query)
            query = soup_form_decode (soup_uri->query);
        else
            query = g_hash_table_new_full (
                g_str_hash, g_str_equal,
                g_free, g_free);
        enc = soup_uri_encode (mail_uri, NULL);
        g_hash_table_insert (query, g_strdup ("__evo-mail"), enc);

        if (display->priv->force_image_load) {
            g_hash_table_insert (
                query,
                g_strdup ("__evo-load-images"),
                g_strdup ("true"));
        }

        g_free (mail_uri);

        soup_uri_set_query_from_form (soup_uri, query);
        g_free (new_uri);

        new_uri = soup_uri_to_string (soup_uri, FALSE);
        webkit_network_request_set_uri (request, new_uri);

        g_free (new_uri);
        soup_uri_free (soup_uri);
        g_hash_table_unref (query);
    }
}

static WebKitDOMElement *
find_element_by_id (WebKitDOMDocument *document,
                    const gchar *id)
{
    WebKitDOMNodeList *frames;
    WebKitDOMElement *element;
    gulong ii, length;

    if (!WEBKIT_DOM_IS_DOCUMENT (document))
        return NULL;

    /* Try to look up the element in this DOM document */
    element = webkit_dom_document_get_element_by_id (document, id);
    if (element != NULL)
        return element;

    /* If the element is not here then recursively scan all frames */
    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++) {
        WebKitDOMHTMLIFrameElement *iframe;
        WebKitDOMDocument *frame_doc;
        WebKitDOMElement *element;

        iframe = WEBKIT_DOM_HTML_IFRAME_ELEMENT (
            webkit_dom_node_list_item (frames, ii));

        frame_doc = webkit_dom_html_iframe_element_get_content_document (iframe);

        element = find_element_by_id (frame_doc, id);

        if (element != NULL)
            return element;
    }

    return NULL;
}

static void
mail_display_plugin_widget_resize (GtkWidget *widget,
                                   gpointer dummy,
                                   EMailDisplay *display)
{
    WebKitDOMElement *parent_element;
    gchar *dim;
    gint height, width;
    gfloat scale;

    parent_element = g_object_get_data (G_OBJECT (widget), "parent_element");

    if (!WEBKIT_DOM_IS_ELEMENT (parent_element)) {
        d (
            printf ("%s: %s does not have (valid) parent element!\n",
            G_STRFUNC, (gchar *) g_object_get_data (object, "uri")));
        return;
    }

    scale = webkit_web_view_get_zoom_level (WEBKIT_WEB_VIEW (display));
    width = gtk_widget_get_allocated_width (widget);
    gtk_widget_get_preferred_height_for_width (widget, width, &height, NULL);

    /* When zooming WebKit does not change dimensions of the elements, but
     * only scales them on the canvas. GtkWidget can't be scaled though
     * so we need to cope with the dimensions changes to keep the widgets
     * still the correct size. Due to inaccuracy in rounding (float -> int)
     * it still acts a bit funny, but at least it does not cause widgets in
     * WebKit to go crazy when zooming. */
    height = height * (1 / scale);

    /* Int -> Str */
    dim = g_strdup_printf ("%d", height);

    /* Set height of the containment <object> to match height of the
     * GtkWidget it contains */
    webkit_dom_html_object_element_set_height (
        WEBKIT_DOM_HTML_OBJECT_ELEMENT (parent_element), dim);
    g_free (dim);
}

static void
mail_display_plugin_widget_realize_cb (GtkWidget *widget,
                                       gpointer user_data)
{
    WebKitDOMHTMLElement *element;

    if (GTK_IS_BOX (widget)) {
        GList *children;

        children = gtk_container_get_children (GTK_CONTAINER (widget));
        if (children && children->data &&
            E_IS_ATTACHMENT_BAR (children->data)) {
            widget = children->data;
        }

        g_list_free (children);
    }

    /* First check if we are actually supposed to be visible */
    element = g_object_get_data (G_OBJECT (widget), "parent_element");
    if (element == NULL || !WEBKIT_DOM_IS_HTML_ELEMENT (element)) {
        g_warning ("UAAAAA");
    } else {
        if (webkit_dom_html_element_get_hidden (element)) {
            gtk_widget_hide (widget);
            return;
        }
    }

    /* Initial resize of the <object> element when the widget
     * is displayed for the first time. */
    mail_display_plugin_widget_resize (widget, NULL, user_data);
}

static void
plugin_widget_set_parent_element (GtkWidget *widget,
                                  EMailDisplay *display)
{
    const gchar *uri;
    WebKitDOMDocument *document;
    WebKitDOMElement *element;

    uri = g_object_get_data (G_OBJECT (widget), "uri");
    if (uri == NULL || *uri == '\0')
        return;

    document = webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (display));
    element = find_element_by_id (document, uri);

    if (!WEBKIT_DOM_IS_ELEMENT (element)) {
        g_warning ("Failed to find parent <object> for '%s' - no ID set?", uri);
        return;
    }

    /* Assign the WebKitDOMElement to "parent_element" data of the GtkWidget
     * and the GtkWidget to "widget" data of the DOM Element */
    g_object_set_data (G_OBJECT (widget), "parent_element", element);
    g_object_set_data (G_OBJECT (element), "widget", widget);

    g_object_bind_property (
        element, "hidden",
        widget, "visible",
        G_BINDING_SYNC_CREATE |
        G_BINDING_INVERT_BOOLEAN);
}

static void
toggle_widget_visibility (EAttachmentButton *button,
                          EMailDisplay *display,
                          WebKitDOMElement *element)
{
    GtkWidget *widget = NULL;
    gchar *id;

    id = webkit_dom_html_element_get_id (WEBKIT_DOM_HTML_ELEMENT (element));
    if (id == NULL || *id == '\0')
        return;

    if (display->priv->widgets != NULL)
        widget = g_hash_table_lookup (display->priv->widgets, id);

    g_free (id);

    if (widget == NULL)
        return;

    /* If the widget encapsulates EAttachmentBar then check, whether
     * the attachment bar is not empty. We want to display it only
     * when there's at least one attachment */
    if (GTK_IS_BOX (widget)) {
        GList *children;

        children = gtk_container_get_children (GTK_CONTAINER (widget));
        if (children && children->data && E_IS_ATTACHMENT_BAR (children->data)) {
            EAttachmentStore *store;

            store = e_attachment_bar_get_store (
                E_ATTACHMENT_BAR (children->data));

            g_list_free (children);

            /* Don't allow to display such attachment bar,
             * but always allow to hide it */
            if (e_attachment_button_get_expanded (button) &&
                (e_attachment_store_get_num_attachments (store) == 0))
                return;
        }
    }

    webkit_dom_html_element_set_hidden (
        WEBKIT_DOM_HTML_ELEMENT (element),
        !e_attachment_button_get_expanded (button));

    if (e_attachment_button_get_expanded (button))
        gtk_widget_show (widget);
    else
        gtk_widget_hide (widget);
}

/**
 * @button: An #EAttachmentButton
 * @iframe: An iframe element containing document with an attachment
 *      represented by the @button
 */
static void
bind_iframe_content_visibility (WebKitDOMElement *iframe,
                                EMailDisplay *display,
                                EAttachmentButton *button)
{
    WebKitDOMDocument *document;
    WebKitDOMNodeList *nodes;
    gulong ii, length;

    if (!WEBKIT_DOM_IS_HTML_IFRAME_ELEMENT (iframe))
        return;

    document = webkit_dom_html_iframe_element_get_content_document (
        WEBKIT_DOM_HTML_IFRAME_ELEMENT (iframe));
    if (!WEBKIT_DOM_IS_DOCUMENT (document))
        return;

    nodes = webkit_dom_document_get_elements_by_tag_name (document, "object");
    length = webkit_dom_node_list_get_length (nodes);

    d ({
        gchar *name = webkit_dom_html_iframe_element_get_name (
            WEBKIT_DOM_HTML_IFRAME_ELEMENT (iframe));
        printf ("Found %ld objects within iframe %s\n", length, name);
        g_free (name);
    });

    /* Iterate through all <object>s and bind visibility of their widget
     * with expanded-state of related attachment button */
    for (ii = 0; ii < length; ii++) {

        WebKitDOMNode *node = webkit_dom_node_list_item (nodes, ii);

        /* Initial sync */
        toggle_widget_visibility (
            button, display, WEBKIT_DOM_ELEMENT (node));
    }
}

static void
attachment_button_expanded (GObject *object,
                            GParamSpec *pspec,
                            gpointer user_data)
{
    EAttachmentButton *button = E_ATTACHMENT_BUTTON (object);
    EMailDisplay *display = user_data;
    WebKitDOMDocument *document;
    WebKitDOMElement *element;
    WebKitDOMCSSStyleDeclaration *css;
    gboolean expanded;
    gchar *id;

    d (
        printf ("Attachment button %s has been %s!\n",
        (gchar *) g_object_get_data (object, "uri"),
        (e_attachment_button_get_expanded (button) ? "expanded" : "collapsed")));

    expanded =
        e_attachment_button_get_expanded (button) &&
        gtk_widget_get_visible (GTK_WIDGET (button));

    document = webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (display));
    element = find_element_by_id (
        document, g_object_get_data (object, "attachment_id"));

    if (!WEBKIT_DOM_IS_ELEMENT (element)) {
        d (
            printf ("%s: Content <div> of attachment %s does not exist!!\n",
            G_STRFUNC, (gchar *) g_object_get_data (object, "uri")));
        return;
    }

    /* Show or hide the DIV which contains
     * the attachment (iframe, image...). */
    css = webkit_dom_element_get_style (element);
    webkit_dom_css_style_declaration_set_property (
        css, "display", expanded ? "block" : "none", "", NULL);

    id = g_strconcat (
        g_object_get_data (object, "attachment_id"),
        ".iframe", NULL);
    element = find_element_by_id (document, id);
    g_free (id);

    if (!WEBKIT_DOM_IS_HTML_IFRAME_ELEMENT (element)) {
        d (
            printf ("%s: No <iframe> found\n",
            (gchar *) g_object_get_data (object, "attachment_id")));
        return;
    }
    bind_iframe_content_visibility (element, display, button);
}

static void
mail_display_attachment_count_changed (EAttachmentStore *store,
                                       GParamSpec *pspec,
                                       GtkWidget *box)
{
    WebKitDOMHTMLElement *element;
    GList *children;

    children = gtk_container_get_children (GTK_CONTAINER (box));
    g_return_if_fail (children  && children->data);

    element = g_object_get_data (children->data, "parent_element");
    g_list_free (children);

    g_return_if_fail (WEBKIT_DOM_IS_HTML_ELEMENT (element));

    if (e_attachment_store_get_num_attachments (store) == 0) {
        gtk_widget_hide (box);
        webkit_dom_html_element_set_hidden (element, TRUE);
    } else {
        gtk_widget_show (box);
        webkit_dom_html_element_set_hidden (element, FALSE);
    }
}

static GtkWidget *
mail_display_plugin_widget_requested (WebKitWebView *web_view,
                                      gchar *mime_type,
                                      gchar *uri,
                                      GHashTable *param,
                                      gpointer user_data)
{
    EMailDisplay *display;
    EMailExtensionRegistry *reg;
    EMailFormatterExtension *extension;
    GQueue *extensions;
    GList *iter;
    EMailPart *part = NULL;
    GtkWidget *widget = NULL;
    gchar *part_id, *type, *object_uri;

    part_id = g_hash_table_lookup (param, "data");
    if (part_id == NULL || !g_str_has_prefix (uri, "mail://"))
        return NULL;

    type = g_hash_table_lookup (param, "type");
    if (type == NULL)
        return NULL;

    display = E_MAIL_DISPLAY (web_view);

    widget = g_hash_table_lookup (display->priv->widgets, part_id);
    if (widget != NULL) {
        d (printf ("Handeled %s widget request from cache\n", part_id));
        return widget;
    }

    /* Find the EMailPart representing the requested widget. */
    part = e_mail_part_list_ref_part (display->priv->part_list, part_id);
    if (part == NULL)
        return NULL;

    reg = e_mail_formatter_get_extension_registry (display->priv->formatter);
    extensions = e_mail_extension_registry_get_for_mime_type (reg, type);
    if (extensions == NULL)
        goto exit;

    extension = NULL;
    for (iter = g_queue_peek_head_link (extensions); iter; iter = iter->next) {

        extension = iter->data;
        if (extension == NULL)
            continue;

        if (e_mail_formatter_extension_has_widget (extension))
            break;
    }

    if (extension == NULL)
        goto exit;

    /* Get the widget from formatter */
    widget = e_mail_formatter_extension_get_widget (
        extension, display->priv->part_list, part, param);
    d (
        printf ("Created widget %s (%p) for part %s\n",
            G_OBJECT_TYPE_NAME (widget), widget, part_id));

    /* Should not happen! WebKit will display an ugly 'Plug-in not
     * available' placeholder instead of hiding the <object> element. */
    if (widget == NULL)
        goto exit;

    /* Attachment button has URI different then the actual PURI because
     * that URI identifies the attachment itself */
    if (E_IS_ATTACHMENT_BUTTON (widget)) {
        EMailPartAttachment *empa = (EMailPartAttachment *) part;
        gchar *attachment_part_id;

        if (empa->attachment_view_part_id)
            attachment_part_id = empa->attachment_view_part_id;
        else
            attachment_part_id = part_id;

        object_uri = g_strconcat (
            attachment_part_id, ".attachment_button", NULL);
        g_object_set_data_full (
            G_OBJECT (widget), "attachment_id",
            g_strdup (attachment_part_id),
            (GDestroyNotify) g_free);
    } else {
        object_uri = g_strdup (part_id);
    }

    /* Store the uri as data of the widget */
    g_object_set_data_full (
        G_OBJECT (widget), "uri",
        object_uri, (GDestroyNotify) g_free);

    /* Set pointer to the <object> element as GObject data
     * "parent_element" and set pointer to the widget as GObject
     * data "widget" to the <object> element. */
    plugin_widget_set_parent_element (widget, display);

    /* Resizing a GtkWidget requires changing size of parent
     * <object> HTML element in DOM. */
    g_signal_connect (
        widget, "realize",
        G_CALLBACK (mail_display_plugin_widget_realize_cb), display);
    g_signal_connect (
        widget, "size-allocate",
        G_CALLBACK (mail_display_plugin_widget_resize), display);

    if (E_IS_ATTACHMENT_BAR (widget)) {
        GtkWidget *box = NULL;
        EAttachmentStore *store;

        /* Only when packed in box (grid does not work),
         * EAttachmentBar reports correct height */
        box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
        gtk_box_pack_start (GTK_BOX (box), widget, TRUE, TRUE, 0);

        /* When EAttachmentBar is expanded/collapsed it does not
         * emit size-allocate signal despite it changes it's height. */
        g_signal_connect (
            widget, "notify::expanded",
            G_CALLBACK (mail_display_plugin_widget_resize),
            display);
        g_signal_connect (
            widget, "notify::active-view",
            G_CALLBACK (mail_display_plugin_widget_resize),
            display);

        /* Always hide an attachment bar without attachments */
        store = e_attachment_bar_get_store (E_ATTACHMENT_BAR (widget));
        g_signal_connect (
            store, "notify::num-attachments",
            G_CALLBACK (mail_display_attachment_count_changed),
            box);

        gtk_widget_show (widget);
        gtk_widget_show (box);

        /* Initial sync */
        mail_display_attachment_count_changed (store, NULL, box);

        widget = box;

    } else if (E_IS_ATTACHMENT_BUTTON (widget)) {

        /* Bind visibility of DOM element containing related
         * attachment with 'expanded' property of this
         * attachment button. */
        WebKitDOMElement *attachment;
        WebKitDOMDocument *document;
        EMailPartAttachment *empa = (EMailPartAttachment *) part;
        gchar *attachment_part_id;

        if (empa->attachment_view_part_id)
            attachment_part_id = empa->attachment_view_part_id;
        else
            attachment_part_id = part_id;

        /* Find attachment-wrapper div which contains
         * the content of the attachment (iframe). */
        document = webkit_web_view_get_dom_document (
            WEBKIT_WEB_VIEW (display));
        attachment = find_element_by_id (document, attachment_part_id);

        /* None found? Attachment cannot be expanded */
        if (attachment == NULL) {
            e_attachment_button_set_expandable (
                E_ATTACHMENT_BUTTON (widget), FALSE);
        } else {
            const CamelContentDisposition *disposition;

            e_attachment_button_set_expandable (
                E_ATTACHMENT_BUTTON (widget), TRUE);

            /* Show/hide the attachment when the EAttachmentButton
             * is expanded/collapsed or shown/hidden. */
            g_signal_connect (
                widget, "notify::expanded",
                G_CALLBACK (attachment_button_expanded),
                display);
            g_signal_connect (
                widget, "notify::visible",
                G_CALLBACK (attachment_button_expanded),
                display);

            /* Automatically expand attachments that have inline
             * disposition or the EMailParts have specific
             * force_inline flag set. */
            disposition =
                camel_mime_part_get_content_disposition (part->part);
            if (!part->force_collapse &&
                (part->force_inline ||
                (g_strcmp0 (empa->snoop_mime_type, "message/rfc822") == 0) ||
                 (disposition && disposition->disposition &&
                g_ascii_strncasecmp (
                    disposition->disposition, "inline", 6) == 0))) {

                e_attachment_button_set_expanded (
                    E_ATTACHMENT_BUTTON (widget), TRUE);
            } else {
                e_attachment_button_set_expanded (
                    E_ATTACHMENT_BUTTON (widget), FALSE);
                attachment_button_expanded (
                    G_OBJECT (widget), NULL, display);
            }
        }
    }

    g_hash_table_insert (
        display->priv->widgets,
        g_strdup (object_uri), g_object_ref (widget));

exit:
    if (part != NULL)
        e_mail_part_unref (part);

    return widget;
}

static void
toggle_headers_visibility (WebKitDOMElement *button,
                           WebKitDOMEvent *event,
                           WebKitWebView *web_view)
{
    WebKitDOMDocument *document;
    WebKitDOMElement *short_headers, *full_headers;
    WebKitDOMCSSStyleDeclaration *css_short, *css_full;
    gboolean expanded;
    const gchar *path;
    gchar *css_value;

    document = webkit_web_view_get_dom_document (web_view);

    short_headers = webkit_dom_document_get_element_by_id (
        document, "__evo-short-headers");
    if (short_headers == NULL)
        return;

    css_short = webkit_dom_element_get_style (short_headers);

    full_headers = webkit_dom_document_get_element_by_id (
        document, "__evo-full-headers");
    if (full_headers == NULL)
        return;

    css_full = webkit_dom_element_get_style (full_headers);
    css_value = webkit_dom_css_style_declaration_get_property_value (
        css_full, "display");
    expanded = (g_strcmp0 (css_value, "block") == 0);
    g_free (css_value);

    webkit_dom_css_style_declaration_set_property (
        css_full, "display",
        expanded ? "none" : "block", "", NULL);
    webkit_dom_css_style_declaration_set_property (
        css_short, "display",
        expanded ? "block" : "none", "", NULL);

    if (expanded)
        path = "evo-file://" EVOLUTION_IMAGESDIR "/plus.png";
    else
        path = "evo-file://" EVOLUTION_IMAGESDIR "/minus.png";

    webkit_dom_html_image_element_set_src (
        WEBKIT_DOM_HTML_IMAGE_ELEMENT (button), path);

    e_mail_display_set_headers_collapsed (
        E_MAIL_DISPLAY (web_view), expanded);

    d (printf ("Headers %s!\n", expanded ? "collapsed" : "expanded"));
}

static const gchar * addresses[] = { "to", "cc", "bcc" };

static void
toggle_address_visibility (WebKitDOMElement *button,
                           WebKitDOMEvent *event,
                           const gchar *address)
{
    WebKitDOMElement *full_addr, *ellipsis;
    WebKitDOMCSSStyleDeclaration *css_full, *css_ellipsis;
    WebKitDOMDocument *document;
    gchar *id;
    const gchar *path;
    gboolean expanded;

    document = webkit_dom_node_get_owner_document (
        WEBKIT_DOM_NODE (button));

    id = g_strconcat ("__evo-moreaddr-", address, NULL);
    full_addr = webkit_dom_document_get_element_by_id (document, id);
    g_free (id);

    if (full_addr == NULL)
        return;

    css_full = webkit_dom_element_get_style (full_addr);

    id = g_strconcat ("__evo-moreaddr-ellipsis-", address, NULL);
    ellipsis = webkit_dom_document_get_element_by_id (document, id);
    g_free (id);

    if (ellipsis == NULL)
        return;

    css_ellipsis = webkit_dom_element_get_style (ellipsis);

    expanded = (g_strcmp0 (
        webkit_dom_css_style_declaration_get_property_value (
        css_full, "display"), "inline") == 0);

    webkit_dom_css_style_declaration_set_property (
        css_full, "display", (expanded ? "none" : "inline"), "", NULL);
    webkit_dom_css_style_declaration_set_property (
        css_ellipsis, "display", (expanded ? "inline" : "none"), "", NULL);

    if (expanded)
        path = "evo-file://" EVOLUTION_IMAGESDIR "/plus.png";
    else
        path = "evo-file://" EVOLUTION_IMAGESDIR "/minus.png";

    if (!WEBKIT_DOM_IS_HTML_IMAGE_ELEMENT (button)) {
        id = g_strconcat ("__evo-moreaddr-img-", address, NULL);
        button = webkit_dom_document_get_element_by_id (document, id);
        g_free (id);

        if (button == NULL)
            return;
    }

    webkit_dom_html_image_element_set_src (
        WEBKIT_DOM_HTML_IMAGE_ELEMENT (button), path);

}

static void
setup_DOM_bindings (GObject *object,
                    GParamSpec *pspec,
                    gpointer user_data)
{
    WebKitWebView *web_view;
    WebKitWebFrame *frame;
    WebKitLoadStatus load_status;
    WebKitDOMDocument *document;
    WebKitDOMElement *button;
    gint ii = 0;

    frame = WEBKIT_WEB_FRAME (object);
    load_status = webkit_web_frame_get_load_status (frame);
    if (load_status != WEBKIT_LOAD_FINISHED)
        return;

    web_view = webkit_web_frame_get_web_view (frame);
    document = webkit_web_view_get_dom_document (web_view);

    button = webkit_dom_document_get_element_by_id (
        document, "__evo-collapse-headers-img");
    if (button != NULL)
        webkit_dom_event_target_add_event_listener (
            WEBKIT_DOM_EVENT_TARGET (button), "click",
            G_CALLBACK (toggle_headers_visibility),
            FALSE, web_view);

    for (ii = 0; ii < 3; ii++) {
        gchar *id;

        id = g_strconcat ("__evo-moreaddr-img-", addresses[ii], NULL);
        button = webkit_dom_document_get_element_by_id (document, id);
        g_free (id);

        if (button == NULL)
            continue;

        webkit_dom_event_target_add_event_listener (
            WEBKIT_DOM_EVENT_TARGET (button), "click",
            G_CALLBACK (toggle_address_visibility), FALSE,
            (gpointer) addresses[ii]);

        id = g_strconcat (
            "__evo-moreaddr-ellipsis-", addresses[ii], NULL);
        button = webkit_dom_document_get_element_by_id (document, id);
        g_free (id);

        if (button == NULL)
            continue;

        webkit_dom_event_target_add_event_listener (
            WEBKIT_DOM_EVENT_TARGET (button), "click",
            G_CALLBACK (toggle_address_visibility), FALSE,
            (gpointer) addresses[ii]);
    }
}

static void
mail_parts_bind_dom (GObject *object,
                     GParamSpec *pspec,
                     gpointer user_data)
{
    WebKitWebFrame *frame;
    WebKitLoadStatus load_status;
    WebKitWebView *web_view;
    WebKitDOMDocument *document;
    EMailDisplay *display;
    GQueue queue = G_QUEUE_INIT;
    GList *head, *link;
    const gchar *frame_name;

    frame = WEBKIT_WEB_FRAME (object);
    load_status = webkit_web_frame_get_load_status (frame);

    if (load_status != WEBKIT_LOAD_FINISHED)
        return;

    web_view = webkit_web_frame_get_web_view (frame);
    display = E_MAIL_DISPLAY (web_view);
    if (display->priv->part_list == NULL)
        return;

    frame_name = webkit_web_frame_get_name (frame);
    if (frame_name == NULL || *frame_name == '\0')
        frame_name = ".message.headers";

    document = webkit_web_view_get_dom_document (web_view);

    e_mail_part_list_queue_parts (
        display->priv->part_list, frame_name, &queue);
    head = g_queue_peek_head_link (&queue);

    for (link = head; link != NULL; link = g_list_next (link)) {
        EMailPart *part = link->data;

        /* Iterate only the parts rendered in
         * the frame and all it's subparts. */
        if (!g_str_has_prefix (part->id, frame_name))
            break;

        if (part->bind_func != NULL) {
            WebKitDOMElement *element;

            element = find_element_by_id (document, part->id);
            if (element != NULL) {
                d (printf ("/*bind_func*/ for %s\n", part->id));
                part->bind_func (part, element);
            }
        }
    }

    while (!g_queue_is_empty (&queue))
        e_mail_part_unref (g_queue_pop_head (&queue));
}

static void
mail_display_frame_created (WebKitWebView *web_view,
                            WebKitWebFrame *frame,
                            gpointer user_data)
{
    d (printf ("Frame %s created!\n", webkit_web_frame_get_name (frame)));

    /* Call bind_func of all parts written in this frame */
    g_signal_connect (
        frame, "notify::load-status",
        G_CALLBACK (mail_parts_bind_dom), NULL);
}

static void
mail_display_uri_changed (EMailDisplay *display,
                          GParamSpec *pspec,
                          gpointer dummy)
{
    d (printf ("EMailDisplay URI changed, recreating widgets hashtable\n"));

    if (display->priv->widgets != NULL) {
        g_hash_table_foreach (
            display->priv->widgets,
            mail_display_plugin_widget_disconnect, display);
        g_hash_table_destroy (display->priv->widgets);
    }

    display->priv->widgets = g_hash_table_new_full (
        (GHashFunc) g_str_hash,
        (GEqualFunc) g_str_equal,
        (GDestroyNotify) g_free,
        (GDestroyNotify) g_object_unref);
}

static void
mail_display_set_property (GObject *object,
                           guint property_id,
                           const GValue *value,
                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_PART_LIST:
            e_mail_display_set_parts_list (
                E_MAIL_DISPLAY (object),
                g_value_get_pointer (value));
            return;
        case PROP_MODE:
            e_mail_display_set_mode (
                E_MAIL_DISPLAY (object),
                g_value_get_int (value));
            return;
        case PROP_HEADERS_COLLAPSABLE:
            e_mail_display_set_headers_collapsable (
                E_MAIL_DISPLAY (object),
                g_value_get_boolean (value));
            return;
        case PROP_HEADERS_COLLAPSED:
            e_mail_display_set_headers_collapsed (
                E_MAIL_DISPLAY (object),
                g_value_get_boolean (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_display_get_property (GObject *object,
                           guint property_id,
                           GValue *value,
                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_FORMATTER:
            g_value_set_object (
                value, e_mail_display_get_formatter (
                E_MAIL_DISPLAY (object)));
            return;
        case PROP_PART_LIST:
            g_value_set_pointer (
                value, e_mail_display_get_parts_list (
                E_MAIL_DISPLAY (object)));
            return;
        case PROP_MODE:
            g_value_set_int (
                value, e_mail_display_get_mode (
                E_MAIL_DISPLAY (object)));
            return;
        case PROP_HEADERS_COLLAPSABLE:
            g_value_set_boolean (
                value, e_mail_display_get_headers_collapsable (
                E_MAIL_DISPLAY (object)));
            return;
        case PROP_HEADERS_COLLAPSED:
            g_value_set_boolean (
                value, e_mail_display_get_headers_collapsed (
                E_MAIL_DISPLAY (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_display_dispose (GObject *object)
{
    EMailDisplayPrivate *priv;

    priv = E_MAIL_DISPLAY_GET_PRIVATE (object);

    if (priv->scheduled_reload > 0) {
        g_source_remove (priv->scheduled_reload);
        priv->scheduled_reload = 0;
    }

    if (priv->widgets != NULL) {
        g_hash_table_foreach (
            priv->widgets,
            mail_display_plugin_widget_disconnect, object);
        g_hash_table_destroy (priv->widgets);
        priv->widgets = NULL;
    }

    if (priv->settings != NULL) {
        g_signal_handlers_disconnect_matched (
            priv->settings, G_SIGNAL_MATCH_DATA,
            0, 0, NULL, NULL, object);
        g_object_unref (priv->settings);
        priv->settings = NULL;
    }

    g_clear_object (&priv->part_list);
    g_clear_object (&priv->formatter);

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

static void
mail_display_constructed (GObject *object)
{
    e_extensible_load_extensions (E_EXTENSIBLE (object));

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

static void
mail_display_realize (GtkWidget *widget)
{
    /* Chain up to parent's realize() method. */
    GTK_WIDGET_CLASS (e_mail_display_parent_class)->realize (widget);

    mail_display_update_formatter_colors (E_MAIL_DISPLAY (widget));
}

static void
mail_display_style_set (GtkWidget *widget,
                        GtkStyle *previous_style)
{
    EMailDisplay *display = E_MAIL_DISPLAY (widget);

    mail_display_update_formatter_colors (display);

    /* Chain up to parent's style_set() method. */
    GTK_WIDGET_CLASS (e_mail_display_parent_class)->
        style_set (widget, previous_style);
}

static gboolean
mail_display_button_press_event (GtkWidget *widget,
                                 GdkEventButton *event)
{
    WebKitHitTestResult *hit_test;
    WebKitHitTestResultContext context;
    gchar *image_src;
    gboolean visible;
    GtkAction *action;
    GList *extensions, *iter;
    EWebView *web_view = E_WEB_VIEW (widget);

    if (event->button != 3)
        goto chainup;

    hit_test = webkit_web_view_get_hit_test_result (
        WEBKIT_WEB_VIEW (web_view), event);

    g_object_get (
        G_OBJECT (hit_test),
        "context", &context,
        "image-uri", &image_src,
        NULL);

    if ((context & WEBKIT_HIT_TEST_RESULT_CONTEXT_IMAGE)) {
        visible = image_src && g_str_has_prefix (image_src, "cid:");
        if (!visible && image_src)
            visible = mail_display_image_exists_in_cache (image_src);

        if (image_src != NULL)
            g_free (image_src);

        action = e_web_view_get_action (web_view, "image-save");
        if (action != NULL)
            gtk_action_set_visible (action, visible);
    }

    extensions = e_extensible_list_extensions (
        E_EXTENSIBLE (web_view), E_TYPE_EXTENSION);
    for (iter = extensions; iter; iter = g_list_next (iter)) {
        EExtension *extension = iter->data;

        if (!E_IS_MAIL_DISPLAY_POPUP_EXTENSION (extension))
            continue;

        e_mail_display_popup_extension_update_actions (
            E_MAIL_DISPLAY_POPUP_EXTENSION (extension), hit_test);
    }
    g_list_free (extensions);

    g_object_unref (hit_test);

chainup:
    /* Chain up to parent's button_press_event() method. */
    return GTK_WIDGET_CLASS (e_mail_display_parent_class)->
        button_press_event (widget, event);
}

static void
mail_display_set_fonts (EWebView *web_view,
                        PangoFontDescription **monospace,
                        PangoFontDescription **variable)
{
    EMailDisplay *display = E_MAIL_DISPLAY (web_view);
    gboolean use_custom_font;
    gchar *monospace_font;
    gchar *variable_font;

    use_custom_font = g_settings_get_boolean (
        display->priv->settings, "use-custom-font");
    if (!use_custom_font) {
        *monospace = NULL;
        *variable = NULL;
        return;
    }

    monospace_font = g_settings_get_string (
        display->priv->settings, "monospace-font");
    variable_font = g_settings_get_string (
        display->priv->settings, "variable-width-font");

    *monospace = (monospace_font != NULL) ?
        pango_font_description_from_string (monospace_font) : NULL;
    *variable = (variable_font != NULL) ?
        pango_font_description_from_string (variable_font) : NULL;

    g_free (monospace_font);
    g_free (variable_font);
}

static void
e_mail_display_class_init (EMailDisplayClass *class)
{
    GObjectClass *object_class;
    EWebViewClass *web_view_class;
    GtkWidgetClass *widget_class;

    g_type_class_add_private (class, sizeof (EMailDisplayPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->constructed = mail_display_constructed;
    object_class->set_property = mail_display_set_property;
    object_class->get_property = mail_display_get_property;
    object_class->dispose = mail_display_dispose;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->realize = mail_display_realize;
    widget_class->style_set = mail_display_style_set;
    widget_class->button_press_event = mail_display_button_press_event;

    web_view_class = E_WEB_VIEW_CLASS (class);
    web_view_class->set_fonts = mail_display_set_fonts;

    g_object_class_install_property (
        object_class,
        PROP_FORMATTER,
        g_param_spec_pointer (
            "formatter",
            "Mail Formatter",
            NULL,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_PART_LIST,
        g_param_spec_pointer (
            "part-list",
            "Part List",
            NULL,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_MODE,
        g_param_spec_int (
            "mode",
            "Display Mode",
            NULL,
            E_MAIL_FORMATTER_MODE_INVALID,
            G_MAXINT,
            E_MAIL_FORMATTER_MODE_NORMAL,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_HEADERS_COLLAPSABLE,
        g_param_spec_boolean (
            "headers-collapsable",
            "Headers Collapsable",
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_HEADERS_COLLAPSED,
        g_param_spec_boolean (
            "headers-collapsed",
            "Headers Collapsed",
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));
}

static void
e_mail_display_init (EMailDisplay *display)
{
    GtkUIManager *ui_manager;
    const gchar *user_cache_dir;
    WebKitWebSettings *settings;
    WebKitWebFrame *main_frame;
    GtkActionGroup *actions;

    display->priv = E_MAIL_DISPLAY_GET_PRIVATE (display);

    /* Set invalid mode so that MODE property initialization is run
     * completely (see e_mail_display_set_mode) */
    display->priv->mode = E_MAIL_FORMATTER_MODE_INVALID;
    e_mail_display_set_mode (display, E_MAIL_FORMATTER_MODE_NORMAL);
    display->priv->force_image_load = FALSE;
    display->priv->scheduled_reload = 0;

    webkit_web_view_set_full_content_zoom (WEBKIT_WEB_VIEW (display), TRUE);

    settings = webkit_web_view_get_settings (WEBKIT_WEB_VIEW (display));
    g_object_set (settings, "enable-frame-flattening", TRUE, NULL);

    g_signal_connect (
        display, "navigation-policy-decision-requested",
        G_CALLBACK (mail_display_link_clicked), NULL);
    g_signal_connect (
        display, "resource-request-starting",
        G_CALLBACK (mail_display_resource_requested), NULL);
    g_signal_connect (
        display, "process-mailto",
        G_CALLBACK (mail_display_process_mailto), NULL);
    g_signal_connect (
        display, "create-plugin-widget",
        G_CALLBACK (mail_display_plugin_widget_requested), NULL);
    g_signal_connect (
        display, "frame-created",
        G_CALLBACK (mail_display_frame_created), NULL);
    g_signal_connect (
        display, "notify::uri",
        G_CALLBACK (mail_display_uri_changed), NULL);

    display->priv->settings = g_settings_new ("org.gnome.evolution.mail");
    g_signal_connect_swapped (
        display->priv->settings , "changed::monospace-font",
        G_CALLBACK (e_web_view_update_fonts), display);
    g_signal_connect_swapped (
        display->priv->settings , "changed::variable-width-font",
        G_CALLBACK (e_web_view_update_fonts), display);
    g_signal_connect_swapped (
        display->priv->settings , "changed::use-custom-font",
        G_CALLBACK (e_web_view_update_fonts), display);

    e_web_view_update_fonts (E_WEB_VIEW (display));

    main_frame = webkit_web_view_get_main_frame (WEBKIT_WEB_VIEW (display));
    g_signal_connect (
        main_frame, "notify::load-status",
        G_CALLBACK (setup_DOM_bindings), NULL);
    g_signal_connect (
        main_frame, "notify::load-status",
        G_CALLBACK (mail_parts_bind_dom), NULL);

    actions = e_web_view_get_action_group (E_WEB_VIEW (display), "mailto");
    gtk_action_group_add_actions (
        actions, mailto_entries,
        G_N_ELEMENTS (mailto_entries), display);
    ui_manager = e_web_view_get_ui_manager (E_WEB_VIEW (display));
    gtk_ui_manager_add_ui_from_string (ui_manager, ui, -1, NULL);

    actions = e_web_view_get_action_group (E_WEB_VIEW (display), "image");
    gtk_action_group_add_actions (
        actions, image_entries,
        G_N_ELEMENTS (image_entries), display);
    gtk_ui_manager_add_ui_from_string (ui_manager, image_ui, -1, NULL);

    e_web_view_install_request_handler (
        E_WEB_VIEW (display), E_TYPE_MAIL_REQUEST);
    e_web_view_install_request_handler (
        E_WEB_VIEW (display), E_TYPE_HTTP_REQUEST);
    e_web_view_install_request_handler (
        E_WEB_VIEW (display), E_TYPE_FILE_REQUEST);
    e_web_view_install_request_handler (
        E_WEB_VIEW (display), E_TYPE_STOCK_REQUEST);

    if (emd_global_http_cache == NULL) {
        user_cache_dir = e_get_user_cache_dir ();
        emd_global_http_cache = camel_data_cache_new (user_cache_dir, NULL);

        /* cache expiry - 2 hour access, 1 day max */
        camel_data_cache_set_expire_age (
            emd_global_http_cache, 24 * 60 * 60);
        camel_data_cache_set_expire_access (
            emd_global_http_cache, 2 * 60 * 60);
    }
}

EMailFormatterMode
e_mail_display_get_mode (EMailDisplay *display)
{
    g_return_val_if_fail (
        E_IS_MAIL_DISPLAY (display),
        E_MAIL_FORMATTER_MODE_NORMAL);

    return display->priv->mode;
}

void
e_mail_display_set_mode (EMailDisplay *display,
                         EMailFormatterMode mode)
{
    EMailFormatter *formatter;

    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    if (display->priv->mode == mode)
        return;

    display->priv->mode = mode;

    if (display->priv->mode == E_MAIL_FORMATTER_MODE_PRINTING)
        formatter = e_mail_formatter_print_new ();
    else
        formatter = e_mail_formatter_new ();

    g_clear_object (&display->priv->formatter);
    display->priv->formatter = formatter;
    mail_display_update_formatter_colors (display);

    g_signal_connect (
        formatter, "notify::image-loading-policy",
        G_CALLBACK (formatter_image_loading_policy_changed_cb),
        display);

    g_object_connect (
        formatter,
        "swapped-object-signal::notify::charset",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::image-loading-policy",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::mark-citations",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::only-local-photos",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::show-sender-photo",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::show-real-date",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::animate-images",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::text-color",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::body-color",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::citation-color",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::content-color",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::frame-color",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::notify::header-color",
            G_CALLBACK (e_mail_display_reload), display,
        "swapped-object-signal::need-redraw",
            G_CALLBACK (e_mail_display_reload), display,
        NULL);

    e_mail_display_reload (display);

    g_object_notify (G_OBJECT (display), "mode");
}

EMailFormatter *
e_mail_display_get_formatter (EMailDisplay *display)
{
    g_return_val_if_fail (E_IS_MAIL_DISPLAY (display), NULL);

    return display->priv->formatter;
}

EMailPartList *
e_mail_display_get_parts_list (EMailDisplay *display)
{
    g_return_val_if_fail (E_IS_MAIL_DISPLAY (display), NULL);

    return display->priv->part_list;
}

void
e_mail_display_set_parts_list (EMailDisplay *display,
                               EMailPartList *part_list)
{
    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    if (display->priv->part_list == part_list)
        return;

    if (part_list != NULL) {
        g_return_if_fail (E_IS_MAIL_PART_LIST (part_list));
        g_object_ref (part_list);
    }

    if (display->priv->part_list != NULL)
        g_object_unref (display->priv->part_list);

    display->priv->part_list = part_list;

    g_object_notify (G_OBJECT (display), "part-list");
}

gboolean
e_mail_display_get_headers_collapsable (EMailDisplay *display)
{
    g_return_val_if_fail (E_IS_MAIL_DISPLAY (display), FALSE);

    return display->priv->headers_collapsable;
}

void
e_mail_display_set_headers_collapsable (EMailDisplay *display,
                                        gboolean collapsable)
{
    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    if (display->priv->headers_collapsable == collapsable)
        return;

    display->priv->headers_collapsable = collapsable;
    e_mail_display_reload (display);

    g_object_notify (G_OBJECT (display), "headers-collapsable");
}

gboolean
e_mail_display_get_headers_collapsed (EMailDisplay *display)
{
    g_return_val_if_fail (E_IS_MAIL_DISPLAY (display), FALSE);

    if (display->priv->headers_collapsable)
        return display->priv->headers_collapsed;

    return FALSE;
}

void
e_mail_display_set_headers_collapsed (EMailDisplay *display,
                                      gboolean collapsed)
{
    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    if (display->priv->headers_collapsed == collapsed)
        return;

    display->priv->headers_collapsed = collapsed;

    g_object_notify (G_OBJECT (display), "headers-collapsed");
}

void
e_mail_display_load (EMailDisplay *display,
                     const gchar *msg_uri)
{
    EMailPartList *part_list;
    CamelFolder *folder;
    const gchar *message_uid;
    const gchar *default_charset, *charset;
    gchar *uri;

    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    display->priv->force_image_load = FALSE;

    part_list = display->priv->part_list;
    if (part_list == NULL) {
        e_web_view_clear (E_WEB_VIEW (display));
        return;
    }

    folder = e_mail_part_list_get_folder (part_list);
    message_uid = e_mail_part_list_get_message_uid (part_list);
    default_charset = e_mail_formatter_get_default_charset (display->priv->formatter);
    charset = e_mail_formatter_get_charset (display->priv->formatter);

    if (!default_charset)
        default_charset = "";
    if (!charset)
        charset = "";

    uri = e_mail_part_build_uri (
        folder, message_uid,
        "mode", G_TYPE_INT, display->priv->mode,
        "headers_collapsable", G_TYPE_BOOLEAN, display->priv->headers_collapsable,
        "headers_collapsed", G_TYPE_BOOLEAN, display->priv->headers_collapsed,
        "formatter_default_charset", G_TYPE_STRING, default_charset,
        "formatter_charset", G_TYPE_STRING, charset,
        NULL);

    e_web_view_load_uri (E_WEB_VIEW (display), uri);

    g_free (uri);
}

static gboolean
do_reload_display (EMailDisplay *display)
{
    EWebView *web_view;
    gchar *uri, *query;
    GHashTable *table;
    SoupURI *soup_uri;
    gchar *mode, *collapsable, *collapsed;
    const gchar *default_charset, *charset;

    web_view = E_WEB_VIEW (display);
    uri = (gchar *) e_web_view_get_uri (web_view);

    display->priv->scheduled_reload = 0;

    if (uri == NULL || *uri == '\0')
        return FALSE;

    if (strstr (uri, "?") == NULL) {
        e_web_view_reload (web_view);
        return FALSE;
    }

    soup_uri = soup_uri_new (uri);

    mode = g_strdup_printf ("%d", display->priv->mode);
    collapsable = g_strdup_printf ("%d", display->priv->headers_collapsable);
    collapsed = g_strdup_printf ("%d", display->priv->headers_collapsed);
    default_charset = e_mail_formatter_get_default_charset (display->priv->formatter);
    charset = e_mail_formatter_get_charset (display->priv->formatter);

    if (!default_charset)
        default_charset = "";
    if (!charset)
        charset = "";

    table = soup_form_decode (soup_uri->query);
    g_hash_table_replace (
        table, g_strdup ("mode"), mode);
    g_hash_table_replace (
        table, g_strdup ("headers_collapsable"), collapsable);
    g_hash_table_replace (
        table, g_strdup ("headers_collapsed"), collapsed);
    g_hash_table_replace (
        table, g_strdup ("formatter_default_charset"), (gpointer) default_charset);
    g_hash_table_replace (
        table, g_strdup ("formatter_charset"), (gpointer) charset);

    query = soup_form_encode_hash (table);

    /* The hash table does not free custom values upon destruction */
    g_free (mode);
    g_free (collapsable);
    g_free (collapsed);
    g_hash_table_destroy (table);

    soup_uri_set_query (soup_uri, query);
    g_free (query);

    uri = soup_uri_to_string (soup_uri, FALSE);
    e_web_view_load_uri (web_view, uri);
    g_free (uri);
    soup_uri_free (soup_uri);

    return FALSE;
}

void
e_mail_display_reload (EMailDisplay *display)
{
    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    if (display->priv->scheduled_reload > 0)
        return;

    /* Schedule reloading if neccessary.
     * Prioritize ahead of GTK+ redraws. */
    display->priv->scheduled_reload = g_idle_add_full (
        G_PRIORITY_HIGH_IDLE,
        (GSourceFunc) do_reload_display, display, NULL);
}

GtkAction *
e_mail_display_get_action (EMailDisplay *display,
                           const gchar *action_name)
{
    GtkAction *action;

    g_return_val_if_fail (E_IS_MAIL_DISPLAY (display), NULL);
    g_return_val_if_fail (action_name != NULL, NULL);

    action = e_web_view_get_action (E_WEB_VIEW (display), action_name);

    return action;
}

void
e_mail_display_set_status (EMailDisplay *display,
                           const gchar *status)
{
    gchar *str;

    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    str = g_strdup_printf (
        "<!DOCTYPE HTML>\n<html>\n"
        "<head>\n<meta name=\"generator\" content=\"Evolution Mail Component\" />\n"
        "<title>Evolution Mail Display</title>\n"
        "</head>\n"
        "<body bgcolor=\"#%06x\" text=\"#%06x\">"
        "  <style>html, body { height: 100%%; }</style>\n"
        "  <table border=\"0\" width=\"100%%\" height=\"100%%\">\n"
        "    <tr height=\"100%%\" valign=\"middle\">\n"
        "      <td width=\"100%%\" align=\"center\">\n"
        "        <strong>%s</strong>\n"
        "      </td>\n"
        "    </tr>\n"
        "  </table>\n"
        "</body>\n"
        "</html>\n",
        e_color_to_value ((GdkColor *)
            e_mail_formatter_get_color (
                display->priv->formatter,
                E_MAIL_FORMATTER_COLOR_CONTENT)),
        e_color_to_value ((GdkColor *)
            e_mail_formatter_get_color (
                display->priv->formatter,
                E_MAIL_FORMATTER_COLOR_TEXT)),
        status);

    e_web_view_load_string (E_WEB_VIEW (display), str);

    g_free (str);
}

static gchar *
mail_display_get_frame_selection_text (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;

        range = webkit_dom_dom_selection_get_range_at (selection, 0, NULL);
        if (range != NULL)
            return webkit_dom_range_to_string (range, NULL);
    }

    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 = mail_display_get_frame_selection_text (
            WEBKIT_DOM_ELEMENT (node));

        if (text != NULL)
            return text;
    }

    return NULL;
}

gchar *
e_mail_display_get_selection_plain_text (EMailDisplay *display)
{
    WebKitDOMDocument *document;
    WebKitDOMNodeList *frames;
    gulong ii, length;

    g_return_val_if_fail (E_IS_MAIL_DISPLAY (display), NULL);

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

    document = webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (display));
    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 = mail_display_get_frame_selection_text (
            WEBKIT_DOM_ELEMENT (node));

        if (text != NULL)
            return text;
    }

    return NULL;
}

void
e_mail_display_load_images (EMailDisplay *display)
{
    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    display->priv->force_image_load = TRUE;
    e_web_view_reload (E_WEB_VIEW (display));
}

void
e_mail_display_set_force_load_images (EMailDisplay *display,
                                      gboolean force_load_images)
{
    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    display->priv->force_image_load = force_load_images;
}

void
e_mail_display_set_charset (EMailDisplay *display,
                            const gchar *charset)
{
    g_return_if_fail (E_IS_MAIL_DISPLAY (display));

    if (display->priv->formatter != NULL)
        e_mail_formatter_set_charset (
            display->priv->formatter, charset);
}